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-rw-r--r--mm/Kconfig6
-rw-r--r--mm/Kconfig.debug5
-rw-r--r--mm/backing-dev.c8
-rw-r--r--mm/bootmem.c24
-rw-r--r--mm/compaction.c19
-rw-r--r--mm/debug-pagealloc.c3
-rw-r--r--mm/fadvise.c3
-rw-r--r--mm/failslab.c2
-rw-r--r--mm/filemap.c38
-rw-r--r--mm/huge_memory.c93
-rw-r--r--mm/hugetlb.c55
-rw-r--r--mm/ksm.c11
-rw-r--r--mm/memblock.c961
-rw-r--r--mm/memcontrol.c1230
-rw-r--r--mm/memory-failure.c2
-rw-r--r--mm/memory.c4
-rw-r--r--mm/memory_hotplug.c2
-rw-r--r--mm/mempolicy.c27
-rw-r--r--mm/mempool.c104
-rw-r--r--mm/migrate.c187
-rw-r--r--mm/mmap.c60
-rw-r--r--mm/mremap.c9
-rw-r--r--mm/nobootmem.c45
-rw-r--r--mm/oom_kill.c52
-rw-r--r--mm/page-writeback.c568
-rw-r--r--mm/page_alloc.c818
-rw-r--r--mm/page_cgroup.c164
-rw-r--r--mm/percpu.c6
-rw-r--r--mm/rmap.c65
-rw-r--r--mm/shmem.c17
-rw-r--r--mm/slab.c41
-rw-r--r--mm/slub.c99
-rw-r--r--mm/swap.c93
-rw-r--r--mm/swap_state.c11
-rw-r--r--mm/swapfile.c15
-rw-r--r--mm/vmalloc.c48
-rw-r--r--mm/vmscan.c730
-rw-r--r--mm/vmstat.c2
38 files changed, 3067 insertions, 2560 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 011b110365c8..e338407f1225 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -131,6 +131,12 @@ config SPARSEMEM_VMEMMAP
config HAVE_MEMBLOCK
boolean
+config HAVE_MEMBLOCK_NODE_MAP
+ boolean
+
+config ARCH_DISCARD_MEMBLOCK
+ boolean
+
config NO_BOOTMEM
boolean
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index 8b1a477162dc..4b2443254de2 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -4,6 +4,7 @@ config DEBUG_PAGEALLOC
depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
depends on !KMEMCHECK
select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
+ select PAGE_GUARD if ARCH_SUPPORTS_DEBUG_PAGEALLOC
---help---
Unmap pages from the kernel linear mapping after free_pages().
This results in a large slowdown, but helps to find certain types
@@ -22,3 +23,7 @@ config WANT_PAGE_DEBUG_FLAGS
config PAGE_POISONING
bool
select WANT_PAGE_DEBUG_FLAGS
+
+config PAGE_GUARD
+ bool
+ select WANT_PAGE_DEBUG_FLAGS
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 71034f41a2ba..7ba8feae11b8 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -600,14 +600,10 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi)
/*
* Finally, kill the kernel thread. We don't need to be RCU
- * safe anymore, since the bdi is gone from visibility. Force
- * unfreeze of the thread before calling kthread_stop(), otherwise
- * it would never exet if it is currently stuck in the refrigerator.
+ * safe anymore, since the bdi is gone from visibility.
*/
- if (bdi->wb.task) {
- thaw_process(bdi->wb.task);
+ if (bdi->wb.task)
kthread_stop(bdi->wb.task);
- }
}
/*
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 1a77012ecdb3..668e94df8cf2 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -56,7 +56,7 @@ early_param("bootmem_debug", bootmem_debug_setup);
static unsigned long __init bootmap_bytes(unsigned long pages)
{
- unsigned long bytes = (pages + 7) / 8;
+ unsigned long bytes = DIV_ROUND_UP(pages, 8);
return ALIGN(bytes, sizeof(long));
}
@@ -171,7 +171,6 @@ void __init free_bootmem_late(unsigned long addr, unsigned long size)
static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
{
- int aligned;
struct page *page;
unsigned long start, end, pages, count = 0;
@@ -181,14 +180,8 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
start = bdata->node_min_pfn;
end = bdata->node_low_pfn;
- /*
- * If the start is aligned to the machines wordsize, we might
- * be able to free pages in bulks of that order.
- */
- aligned = !(start & (BITS_PER_LONG - 1));
-
- bdebug("nid=%td start=%lx end=%lx aligned=%d\n",
- bdata - bootmem_node_data, start, end, aligned);
+ bdebug("nid=%td start=%lx end=%lx\n",
+ bdata - bootmem_node_data, start, end);
while (start < end) {
unsigned long *map, idx, vec;
@@ -196,12 +189,17 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
map = bdata->node_bootmem_map;
idx = start - bdata->node_min_pfn;
vec = ~map[idx / BITS_PER_LONG];
-
- if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) {
+ /*
+ * If we have a properly aligned and fully unreserved
+ * BITS_PER_LONG block of pages in front of us, free
+ * it in one go.
+ */
+ if (IS_ALIGNED(start, BITS_PER_LONG) && vec == ~0UL) {
int order = ilog2(BITS_PER_LONG);
__free_pages_bootmem(pfn_to_page(start), order);
count += BITS_PER_LONG;
+ start += BITS_PER_LONG;
} else {
unsigned long off = 0;
@@ -214,8 +212,8 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
vec >>= 1;
off++;
}
+ start = ALIGN(start + 1, BITS_PER_LONG);
}
- start += BITS_PER_LONG;
}
page = virt_to_page(bdata->node_bootmem_map);
diff --git a/mm/compaction.c b/mm/compaction.c
index 899d95638586..71a58f67f481 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -350,7 +350,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
}
if (!cc->sync)
- mode |= ISOLATE_CLEAN;
+ mode |= ISOLATE_ASYNC_MIGRATE;
/* Try isolate the page */
if (__isolate_lru_page(page, mode, 0) != 0)
@@ -365,8 +365,10 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
nr_isolated++;
/* Avoid isolating too much */
- if (cc->nr_migratepages == COMPACT_CLUSTER_MAX)
+ if (cc->nr_migratepages == COMPACT_CLUSTER_MAX) {
+ ++low_pfn;
break;
+ }
}
acct_isolated(zone, cc);
@@ -555,7 +557,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
nr_migrate = cc->nr_migratepages;
err = migrate_pages(&cc->migratepages, compaction_alloc,
(unsigned long)cc, false,
- cc->sync);
+ cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC);
update_nr_listpages(cc);
nr_remaining = cc->nr_migratepages;
@@ -669,6 +671,7 @@ static int compact_node(int nid)
.nr_freepages = 0,
.nr_migratepages = 0,
.order = -1,
+ .sync = true,
};
zone = &pgdat->node_zones[zoneid];
@@ -721,23 +724,23 @@ int sysctl_extfrag_handler(struct ctl_table *table, int write,
}
#if defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
-ssize_t sysfs_compact_node(struct sys_device *dev,
- struct sysdev_attribute *attr,
+ssize_t sysfs_compact_node(struct device *dev,
+ struct device_attribute *attr,
const char *buf, size_t count)
{
compact_node(dev->id);
return count;
}
-static SYSDEV_ATTR(compact, S_IWUSR, NULL, sysfs_compact_node);
+static DEVICE_ATTR(compact, S_IWUSR, NULL, sysfs_compact_node);
int compaction_register_node(struct node *node)
{
- return sysdev_create_file(&node->sysdev, &attr_compact);
+ return device_create_file(&node->dev, &dev_attr_compact);
}
void compaction_unregister_node(struct node *node)
{
- return sysdev_remove_file(&node->sysdev, &attr_compact);
+ return device_remove_file(&node->dev, &dev_attr_compact);
}
#endif /* CONFIG_SYSFS && CONFIG_NUMA */
diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c
index 7cea557407f4..789ff70c8a4a 100644
--- a/mm/debug-pagealloc.c
+++ b/mm/debug-pagealloc.c
@@ -95,9 +95,6 @@ static void unpoison_pages(struct page *page, int n)
void kernel_map_pages(struct page *page, int numpages, int enable)
{
- if (!debug_pagealloc_enabled)
- return;
-
if (enable)
unpoison_pages(page, numpages);
else
diff --git a/mm/fadvise.c b/mm/fadvise.c
index 8d723c9e8b75..469491e0af79 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -117,7 +117,8 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
break;
case POSIX_FADV_DONTNEED:
if (!bdi_write_congested(mapping->backing_dev_info))
- filemap_flush(mapping);
+ __filemap_fdatawrite_range(mapping, offset, endbyte,
+ WB_SYNC_NONE);
/* First and last FULL page! */
start_index = (offset+(PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;
diff --git a/mm/failslab.c b/mm/failslab.c
index 0dd7b8fec71c..fefaabaab76d 100644
--- a/mm/failslab.c
+++ b/mm/failslab.c
@@ -35,7 +35,7 @@ __setup("failslab=", setup_failslab);
static int __init failslab_debugfs_init(void)
{
struct dentry *dir;
- mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
+ umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
if (IS_ERR(dir))
diff --git a/mm/filemap.c b/mm/filemap.c
index c0018f2d50e0..97f49ed35bd2 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -393,24 +393,11 @@ EXPORT_SYMBOL(filemap_write_and_wait_range);
int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
{
int error;
- struct mem_cgroup *memcg = NULL;
VM_BUG_ON(!PageLocked(old));
VM_BUG_ON(!PageLocked(new));
VM_BUG_ON(new->mapping);
- /*
- * This is not page migration, but prepare_migration and
- * end_migration does enough work for charge replacement.
- *
- * In the longer term we probably want a specialized function
- * for moving the charge from old to new in a more efficient
- * manner.
- */
- error = mem_cgroup_prepare_migration(old, new, &memcg, gfp_mask);
- if (error)
- return error;
-
error = radix_tree_preload(gfp_mask & ~__GFP_HIGHMEM);
if (!error) {
struct address_space *mapping = old->mapping;
@@ -432,13 +419,12 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
if (PageSwapBacked(new))
__inc_zone_page_state(new, NR_SHMEM);
spin_unlock_irq(&mapping->tree_lock);
+ /* mem_cgroup codes must not be called under tree_lock */
+ mem_cgroup_replace_page_cache(old, new);
radix_tree_preload_end();
if (freepage)
freepage(old);
page_cache_release(old);
- mem_cgroup_end_migration(memcg, old, new, true);
- } else {
- mem_cgroup_end_migration(memcg, old, new, false);
}
return error;
@@ -1828,7 +1814,7 @@ repeat:
page = __page_cache_alloc(gfp | __GFP_COLD);
if (!page)
return ERR_PTR(-ENOMEM);
- err = add_to_page_cache_lru(page, mapping, index, GFP_KERNEL);
+ err = add_to_page_cache_lru(page, mapping, index, gfp);
if (unlikely(err)) {
page_cache_release(page);
if (err == -EEXIST)
@@ -1925,10 +1911,7 @@ static struct page *wait_on_page_read(struct page *page)
* @gfp: the page allocator flags to use if allocating
*
* This is the same as "read_mapping_page(mapping, index, NULL)", but with
- * any new page allocations done using the specified allocation flags. Note
- * that the Radix tree operations will still use GFP_KERNEL, so you can't
- * expect to do this atomically or anything like that - but you can pass in
- * other page requirements.
+ * any new page allocations done using the specified allocation flags.
*
* If the page does not get brought uptodate, return -EIO.
*/
@@ -1971,7 +1954,7 @@ EXPORT_SYMBOL(read_cache_page);
*/
int should_remove_suid(struct dentry *dentry)
{
- mode_t mode = dentry->d_inode->i_mode;
+ umode_t mode = dentry->d_inode->i_mode;
int kill = 0;
/* suid always must be killed */
@@ -2354,8 +2337,11 @@ struct page *grab_cache_page_write_begin(struct address_space *mapping,
pgoff_t index, unsigned flags)
{
int status;
+ gfp_t gfp_mask;
struct page *page;
gfp_t gfp_notmask = 0;
+
+ gfp_mask = mapping_gfp_mask(mapping) | __GFP_WRITE;
if (flags & AOP_FLAG_NOFS)
gfp_notmask = __GFP_FS;
repeat:
@@ -2363,7 +2349,7 @@ repeat:
if (page)
goto found;
- page = __page_cache_alloc(mapping_gfp_mask(mapping) & ~gfp_notmask);
+ page = __page_cache_alloc(gfp_mask & ~gfp_notmask);
if (!page)
return NULL;
status = add_to_page_cache_lru(page, mapping, index,
@@ -2407,7 +2393,6 @@ static ssize_t generic_perform_write(struct file *file,
iov_iter_count(i));
again:
-
/*
* Bring in the user page that we will copy from _first_.
* Otherwise there's a nasty deadlock on copying from the
@@ -2463,7 +2448,10 @@ again:
written += copied;
balance_dirty_pages_ratelimited(mapping);
-
+ if (fatal_signal_pending(current)) {
+ status = -EINTR;
+ break;
+ }
} while (iov_iter_count(i));
return written ? written : status;
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 36b3d988b4ef..b3ffc21ce801 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -487,41 +487,68 @@ static struct attribute_group khugepaged_attr_group = {
.attrs = khugepaged_attr,
.name = "khugepaged",
};
-#endif /* CONFIG_SYSFS */
-static int __init hugepage_init(void)
+static int __init hugepage_init_sysfs(struct kobject **hugepage_kobj)
{
int err;
-#ifdef CONFIG_SYSFS
- static struct kobject *hugepage_kobj;
-#endif
-
- err = -EINVAL;
- if (!has_transparent_hugepage()) {
- transparent_hugepage_flags = 0;
- goto out;
- }
-#ifdef CONFIG_SYSFS
- err = -ENOMEM;
- hugepage_kobj = kobject_create_and_add("transparent_hugepage", mm_kobj);
- if (unlikely(!hugepage_kobj)) {
+ *hugepage_kobj = kobject_create_and_add("transparent_hugepage", mm_kobj);
+ if (unlikely(!*hugepage_kobj)) {
printk(KERN_ERR "hugepage: failed kobject create\n");
- goto out;
+ return -ENOMEM;
}
- err = sysfs_create_group(hugepage_kobj, &hugepage_attr_group);
+ err = sysfs_create_group(*hugepage_kobj, &hugepage_attr_group);
if (err) {
printk(KERN_ERR "hugepage: failed register hugeage group\n");
- goto out;
+ goto delete_obj;
}
- err = sysfs_create_group(hugepage_kobj, &khugepaged_attr_group);
+ err = sysfs_create_group(*hugepage_kobj, &khugepaged_attr_group);
if (err) {
printk(KERN_ERR "hugepage: failed register hugeage group\n");
- goto out;
+ goto remove_hp_group;
}
-#endif
+
+ return 0;
+
+remove_hp_group:
+ sysfs_remove_group(*hugepage_kobj, &hugepage_attr_group);
+delete_obj:
+ kobject_put(*hugepage_kobj);
+ return err;
+}
+
+static void __init hugepage_exit_sysfs(struct kobject *hugepage_kobj)
+{
+ sysfs_remove_group(hugepage_kobj, &khugepaged_attr_group);
+ sysfs_remove_group(hugepage_kobj, &hugepage_attr_group);
+ kobject_put(hugepage_kobj);
+}
+#else
+static inline int hugepage_init_sysfs(struct kobject **hugepage_kobj)
+{
+ return 0;
+}
+
+static inline void hugepage_exit_sysfs(struct kobject *hugepage_kobj)
+{
+}
+#endif /* CONFIG_SYSFS */
+
+static int __init hugepage_init(void)
+{
+ int err;
+ struct kobject *hugepage_kobj;
+
+ if (!has_transparent_hugepage()) {
+ transparent_hugepage_flags = 0;
+ return -EINVAL;
+ }
+
+ err = hugepage_init_sysfs(&hugepage_kobj);
+ if (err)
+ return err;
err = khugepaged_slab_init();
if (err)
@@ -545,7 +572,9 @@ static int __init hugepage_init(void)
set_recommended_min_free_kbytes();
+ return 0;
out:
+ hugepage_exit_sysfs(hugepage_kobj);
return err;
}
module_init(hugepage_init)
@@ -997,7 +1026,7 @@ out:
}
int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
- pmd_t *pmd)
+ pmd_t *pmd, unsigned long addr)
{
int ret = 0;
@@ -1013,6 +1042,7 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
pgtable = get_pmd_huge_pte(tlb->mm);
page = pmd_page(*pmd);
pmd_clear(pmd);
+ tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
page_remove_rmap(page);
VM_BUG_ON(page_mapcount(page) < 0);
add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR);
@@ -1116,7 +1146,6 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
entry = pmd_modify(entry, newprot);
set_pmd_at(mm, addr, pmd, entry);
spin_unlock(&vma->vm_mm->page_table_lock);
- flush_tlb_range(vma, addr, addr + HPAGE_PMD_SIZE);
ret = 1;
}
} else
@@ -1199,16 +1228,16 @@ static int __split_huge_page_splitting(struct page *page,
static void __split_huge_page_refcount(struct page *page)
{
int i;
- unsigned long head_index = page->index;
struct zone *zone = page_zone(page);
- int zonestat;
int tail_count = 0;
/* prevent PageLRU to go away from under us, and freeze lru stats */
spin_lock_irq(&zone->lru_lock);
compound_lock(page);
+ /* complete memcg works before add pages to LRU */
+ mem_cgroup_split_huge_fixup(page);
- for (i = 1; i < HPAGE_PMD_NR; i++) {
+ for (i = HPAGE_PMD_NR - 1; i >= 1; i--) {
struct page *page_tail = page + i;
/* tail_page->_mapcount cannot change */
@@ -1271,14 +1300,13 @@ static void __split_huge_page_refcount(struct page *page)
BUG_ON(page_tail->mapping);
page_tail->mapping = page->mapping;
- page_tail->index = ++head_index;
+ page_tail->index = page->index + i;
BUG_ON(!PageAnon(page_tail));
BUG_ON(!PageUptodate(page_tail));
BUG_ON(!PageDirty(page_tail));
BUG_ON(!PageSwapBacked(page_tail));
- mem_cgroup_split_huge_fixup(page, page_tail);
lru_add_page_tail(zone, page, page_tail);
}
@@ -1288,15 +1316,6 @@ static void __split_huge_page_refcount(struct page *page)
__dec_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
__mod_zone_page_state(zone, NR_ANON_PAGES, HPAGE_PMD_NR);
- /*
- * A hugepage counts for HPAGE_PMD_NR pages on the LRU statistics,
- * so adjust those appropriately if this page is on the LRU.
- */
- if (PageLRU(page)) {
- zonestat = NR_LRU_BASE + page_lru(page);
- __mod_zone_page_state(zone, zonestat, -(HPAGE_PMD_NR-1));
- }
-
ClearPageCompound(page);
compound_unlock(page);
spin_unlock_irq(&zone->lru_lock);
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 73f17c0293c0..ea8c3a4cd2ae 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -800,7 +800,7 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid)
if (page && arch_prepare_hugepage(page)) {
__free_pages(page, huge_page_order(h));
- return NULL;
+ page = NULL;
}
spin_lock(&hugetlb_lock);
@@ -901,7 +901,6 @@ retry:
h->resv_huge_pages += delta;
ret = 0;
- spin_unlock(&hugetlb_lock);
/* Free the needed pages to the hugetlb pool */
list_for_each_entry_safe(page, tmp, &surplus_list, lru) {
if ((--needed) < 0)
@@ -915,6 +914,7 @@ retry:
VM_BUG_ON(page_count(page));
enqueue_huge_page(h, page);
}
+ spin_unlock(&hugetlb_lock);
/* Free unnecessary surplus pages to the buddy allocator */
free:
@@ -1592,9 +1592,9 @@ static void __init hugetlb_sysfs_init(void)
/*
* node_hstate/s - associate per node hstate attributes, via their kobjects,
- * with node sysdevs in node_devices[] using a parallel array. The array
- * index of a node sysdev or _hstate == node id.
- * This is here to avoid any static dependency of the node sysdev driver, in
+ * with node devices in node_devices[] using a parallel array. The array
+ * index of a node device or _hstate == node id.
+ * This is here to avoid any static dependency of the node device driver, in
* the base kernel, on the hugetlb module.
*/
struct node_hstate {
@@ -1604,7 +1604,7 @@ struct node_hstate {
struct node_hstate node_hstates[MAX_NUMNODES];
/*
- * A subset of global hstate attributes for node sysdevs
+ * A subset of global hstate attributes for node devices
*/
static struct attribute *per_node_hstate_attrs[] = {
&nr_hugepages_attr.attr,
@@ -1618,7 +1618,7 @@ static struct attribute_group per_node_hstate_attr_group = {
};
/*
- * kobj_to_node_hstate - lookup global hstate for node sysdev hstate attr kobj.
+ * kobj_to_node_hstate - lookup global hstate for node device hstate attr kobj.
* Returns node id via non-NULL nidp.
*/
static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp)
@@ -1641,13 +1641,13 @@ static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp)
}
/*
- * Unregister hstate attributes from a single node sysdev.
+ * Unregister hstate attributes from a single node device.
* No-op if no hstate attributes attached.
*/
void hugetlb_unregister_node(struct node *node)
{
struct hstate *h;
- struct node_hstate *nhs = &node_hstates[node->sysdev.id];
+ struct node_hstate *nhs = &node_hstates[node->dev.id];
if (!nhs->hugepages_kobj)
return; /* no hstate attributes */
@@ -1663,7 +1663,7 @@ void hugetlb_unregister_node(struct node *node)
}
/*
- * hugetlb module exit: unregister hstate attributes from node sysdevs
+ * hugetlb module exit: unregister hstate attributes from node devices
* that have them.
*/
static void hugetlb_unregister_all_nodes(void)
@@ -1671,7 +1671,7 @@ static void hugetlb_unregister_all_nodes(void)
int nid;
/*
- * disable node sysdev registrations.
+ * disable node device registrations.
*/
register_hugetlbfs_with_node(NULL, NULL);
@@ -1683,20 +1683,20 @@ static void hugetlb_unregister_all_nodes(void)
}
/*
- * Register hstate attributes for a single node sysdev.
+ * Register hstate attributes for a single node device.
* No-op if attributes already registered.
*/
void hugetlb_register_node(struct node *node)
{
struct hstate *h;
- struct node_hstate *nhs = &node_hstates[node->sysdev.id];
+ struct node_hstate *nhs = &node_hstates[node->dev.id];
int err;
if (nhs->hugepages_kobj)
return; /* already allocated */
nhs->hugepages_kobj = kobject_create_and_add("hugepages",
- &node->sysdev.kobj);
+ &node->dev.kobj);
if (!nhs->hugepages_kobj)
return;
@@ -1707,7 +1707,7 @@ void hugetlb_register_node(struct node *node)
if (err) {
printk(KERN_ERR "Hugetlb: Unable to add hstate %s"
" for node %d\n",
- h->name, node->sysdev.id);
+ h->name, node->dev.id);
hugetlb_unregister_node(node);
break;
}
@@ -1716,8 +1716,8 @@ void hugetlb_register_node(struct node *node)
/*
* hugetlb init time: register hstate attributes for all registered node
- * sysdevs of nodes that have memory. All on-line nodes should have
- * registered their associated sysdev by this time.
+ * devices of nodes that have memory. All on-line nodes should have
+ * registered their associated device by this time.
*/
static void hugetlb_register_all_nodes(void)
{
@@ -1725,12 +1725,12 @@ static void hugetlb_register_all_nodes(void)
for_each_node_state(nid, N_HIGH_MEMORY) {
struct node *node = &node_devices[nid];
- if (node->sysdev.id == nid)
+ if (node->dev.id == nid)
hugetlb_register_node(node);
}
/*
- * Let the node sysdev driver know we're here so it can
+ * Let the node device driver know we're here so it can
* [un]register hstate attributes on node hotplug.
*/
register_hugetlbfs_with_node(hugetlb_register_node,
@@ -2315,8 +2315,7 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
* from page cache lookup which is in HPAGE_SIZE units.
*/
address = address & huge_page_mask(h);
- pgoff = ((address - vma->vm_start) >> PAGE_SHIFT)
- + (vma->vm_pgoff >> PAGE_SHIFT);
+ pgoff = vma_hugecache_offset(h, vma, address);
mapping = (struct address_space *)page_private(page);
/*
@@ -2349,6 +2348,9 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
/*
* Hugetlb_cow() should be called with page lock of the original hugepage held.
+ * Called with hugetlb_instantiation_mutex held and pte_page locked so we
+ * cannot race with other handlers or page migration.
+ * Keep the pte_same checks anyway to make transition from the mutex easier.
*/
static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, pte_t *ptep, pte_t pte,
@@ -2408,7 +2410,14 @@ retry_avoidcopy:
BUG_ON(page_count(old_page) != 1);
BUG_ON(huge_pte_none(pte));
spin_lock(&mm->page_table_lock);
- goto retry_avoidcopy;
+ ptep = huge_pte_offset(mm, address & huge_page_mask(h));
+ if (likely(pte_same(huge_ptep_get(ptep), pte)))
+ goto retry_avoidcopy;
+ /*
+ * race occurs while re-acquiring page_table_lock, and
+ * our job is done.
+ */
+ return 0;
}
WARN_ON_ONCE(1);
}
@@ -2630,6 +2639,8 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
static DEFINE_MUTEX(hugetlb_instantiation_mutex);
struct hstate *h = hstate_vma(vma);
+ address &= huge_page_mask(h);
+
ptep = huge_pte_offset(mm, address);
if (ptep) {
entry = huge_ptep_get(ptep);
diff --git a/mm/ksm.c b/mm/ksm.c
index 310544a379ae..1925ffbfb27f 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -28,6 +28,7 @@
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/slab.h>
+#include <linux/memcontrol.h>
#include <linux/rbtree.h>
#include <linux/memory.h>
#include <linux/mmu_notifier.h>
@@ -1571,6 +1572,16 @@ struct page *ksm_does_need_to_copy(struct page *page,
new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
if (new_page) {
+ /*
+ * The memcg-specific accounting when moving
+ * pages around the LRU lists relies on the
+ * page's owner (memcg) to be valid. Usually,
+ * pages are assigned to a new owner before
+ * being put on the LRU list, but since this
+ * is not the case here, the stale owner from
+ * a previous allocation cycle must be reset.
+ */
+ mem_cgroup_reset_owner(new_page);
copy_user_highpage(new_page, page, address, vma);
SetPageDirty(new_page);
diff --git a/mm/memblock.c b/mm/memblock.c
index 84bec4969ed5..2f55f19b7c86 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -20,12 +20,23 @@
#include <linux/seq_file.h>
#include <linux/memblock.h>
-struct memblock memblock __initdata_memblock;
+static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
+static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
+
+struct memblock memblock __initdata_memblock = {
+ .memory.regions = memblock_memory_init_regions,
+ .memory.cnt = 1, /* empty dummy entry */
+ .memory.max = INIT_MEMBLOCK_REGIONS,
+
+ .reserved.regions = memblock_reserved_init_regions,
+ .reserved.cnt = 1, /* empty dummy entry */
+ .reserved.max = INIT_MEMBLOCK_REGIONS,
+
+ .current_limit = MEMBLOCK_ALLOC_ANYWHERE,
+};
int memblock_debug __initdata_memblock;
-int memblock_can_resize __initdata_memblock;
-static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;
-static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;
+static int memblock_can_resize __initdata_memblock;
/* inline so we don't get a warning when pr_debug is compiled out */
static inline const char *memblock_type_name(struct memblock_type *type)
@@ -38,20 +49,15 @@ static inline const char *memblock_type_name(struct memblock_type *type)
return "unknown";
}
-/*
- * Address comparison utilities
- */
-
-static phys_addr_t __init_memblock memblock_align_down(phys_addr_t addr, phys_addr_t size)
-{
- return addr & ~(size - 1);
-}
-
-static phys_addr_t __init_memblock memblock_align_up(phys_addr_t addr, phys_addr_t size)
+/* adjust *@size so that (@base + *@size) doesn't overflow, return new size */
+static inline phys_addr_t memblock_cap_size(phys_addr_t base, phys_addr_t *size)
{
- return (addr + (size - 1)) & ~(size - 1);
+ return *size = min(*size, (phys_addr_t)ULLONG_MAX - base);
}
+/*
+ * Address comparison utilities
+ */
static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
phys_addr_t base2, phys_addr_t size2)
{
@@ -73,83 +79,66 @@ static long __init_memblock memblock_overlaps_region(struct memblock_type *type,
return (i < type->cnt) ? i : -1;
}
-/*
- * Find, allocate, deallocate or reserve unreserved regions. All allocations
- * are top-down.
+/**
+ * memblock_find_in_range_node - find free area in given range and node
+ * @start: start of candidate range
+ * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
+ * @size: size of free area to find
+ * @align: alignment of free area to find
+ * @nid: nid of the free area to find, %MAX_NUMNODES for any node
+ *
+ * Find @size free area aligned to @align in the specified range and node.
+ *
+ * RETURNS:
+ * Found address on success, %0 on failure.
*/
-
-static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_addr_t end,
- phys_addr_t size, phys_addr_t align)
+phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
+ phys_addr_t end, phys_addr_t size,
+ phys_addr_t align, int nid)
{
- phys_addr_t base, res_base;
- long j;
-
- /* In case, huge size is requested */
- if (end < size)
- return MEMBLOCK_ERROR;
-
- base = memblock_align_down((end - size), align);
+ phys_addr_t this_start, this_end, cand;
+ u64 i;
- /* Prevent allocations returning 0 as it's also used to
- * indicate an allocation failure
- */
- if (start == 0)
- start = PAGE_SIZE;
-
- while (start <= base) {
- j = memblock_overlaps_region(&memblock.reserved, base, size);
- if (j < 0)
- return base;
- res_base = memblock.reserved.regions[j].base;
- if (res_base < size)
- break;
- base = memblock_align_down(res_base - size, align);
- }
+ /* align @size to avoid excessive fragmentation on reserved array */
+ size = round_up(size, align);
- return MEMBLOCK_ERROR;
-}
-
-static phys_addr_t __init_memblock memblock_find_base(phys_addr_t size,
- phys_addr_t align, phys_addr_t start, phys_addr_t end)
-{
- long i;
-
- BUG_ON(0 == size);
-
- /* Pump up max_addr */
+ /* pump up @end */
if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
end = memblock.current_limit;
- /* We do a top-down search, this tends to limit memory
- * fragmentation by keeping early boot allocs near the
- * top of memory
- */
- for (i = memblock.memory.cnt - 1; i >= 0; i--) {
- phys_addr_t memblockbase = memblock.memory.regions[i].base;
- phys_addr_t memblocksize = memblock.memory.regions[i].size;
- phys_addr_t bottom, top, found;
+ /* adjust @start to avoid underflow and allocating the first page */
+ start = max3(start, size, (phys_addr_t)PAGE_SIZE);
+ end = max(start, end);
- if (memblocksize < size)
- continue;
- if ((memblockbase + memblocksize) <= start)
- break;
- bottom = max(memblockbase, start);
- top = min(memblockbase + memblocksize, end);
- if (bottom >= top)
- continue;
- found = memblock_find_region(bottom, top, size, align);
- if (found != MEMBLOCK_ERROR)
- return found;
+ for_each_free_mem_range_reverse(i, nid, &this_start, &this_end, NULL) {
+ this_start = clamp(this_start, start, end);
+ this_end = clamp(this_end, start, end);
+
+ cand = round_down(this_end - size, align);
+ if (cand >= this_start)
+ return cand;
}
- return MEMBLOCK_ERROR;
+ return 0;
}
-/*
- * Find a free area with specified alignment in a specific range.
+/**
+ * memblock_find_in_range - find free area in given range
+ * @start: start of candidate range
+ * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
+ * @size: size of free area to find
+ * @align: alignment of free area to find
+ *
+ * Find @size free area aligned to @align in the specified range.
+ *
+ * RETURNS:
+ * Found address on success, %0 on failure.
*/
-u64 __init_memblock memblock_find_in_range(u64 start, u64 end, u64 size, u64 align)
+phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start,
+ phys_addr_t end, phys_addr_t size,
+ phys_addr_t align)
{
- return memblock_find_base(size, align, start, end);
+ return memblock_find_in_range_node(start, end, size, align,
+ MAX_NUMNODES);
}
/*
@@ -178,25 +167,21 @@ int __init_memblock memblock_reserve_reserved_regions(void)
static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
{
- unsigned long i;
-
- for (i = r; i < type->cnt - 1; i++) {
- type->regions[i].base = type->regions[i + 1].base;
- type->regions[i].size = type->regions[i + 1].size;
- }
+ type->total_size -= type->regions[r].size;
+ memmove(&type->regions[r], &type->regions[r + 1],
+ (type->cnt - (r + 1)) * sizeof(type->regions[r]));
type->cnt--;
/* Special case for empty arrays */
if (type->cnt == 0) {
+ WARN_ON(type->total_size != 0);
type->cnt = 1;
type->regions[0].base = 0;
type->regions[0].size = 0;
+ memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
}
}
-/* Defined below but needed now */
-static long memblock_add_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size);
-
static int __init_memblock memblock_double_array(struct memblock_type *type)
{
struct memblock_region *new_array, *old_array;
@@ -226,10 +211,10 @@ static int __init_memblock memblock_double_array(struct memblock_type *type)
*/
if (use_slab) {
new_array = kmalloc(new_size, GFP_KERNEL);
- addr = new_array == NULL ? MEMBLOCK_ERROR : __pa(new_array);
+ addr = new_array ? __pa(new_array) : 0;
} else
- addr = memblock_find_base(new_size, sizeof(phys_addr_t), 0, MEMBLOCK_ALLOC_ACCESSIBLE);
- if (addr == MEMBLOCK_ERROR) {
+ addr = memblock_find_in_range(0, MEMBLOCK_ALLOC_ACCESSIBLE, new_size, sizeof(phys_addr_t));
+ if (!addr) {
pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n",
memblock_type_name(type), type->max, type->max * 2);
return -1;
@@ -254,7 +239,7 @@ static int __init_memblock memblock_double_array(struct memblock_type *type)
return 0;
/* Add the new reserved region now. Should not fail ! */
- BUG_ON(memblock_add_region(&memblock.reserved, addr, new_size));
+ BUG_ON(memblock_reserve(addr, new_size));
/* If the array wasn't our static init one, then free it. We only do
* that before SLAB is available as later on, we don't know whether
@@ -268,343 +253,514 @@ static int __init_memblock memblock_double_array(struct memblock_type *type)
return 0;
}
-int __init_memblock __weak memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
- phys_addr_t addr2, phys_addr_t size2)
-{
- return 1;
-}
-
-static long __init_memblock memblock_add_region(struct memblock_type *type,
- phys_addr_t base, phys_addr_t size)
+/**
+ * memblock_merge_regions - merge neighboring compatible regions
+ * @type: memblock type to scan
+ *
+ * Scan @type and merge neighboring compatible regions.
+ */
+static void __init_memblock memblock_merge_regions(struct memblock_type *type)
{
- phys_addr_t end = base + size;
- int i, slot = -1;
-
- /* First try and coalesce this MEMBLOCK with others */
- for (i = 0; i < type->cnt; i++) {
- struct memblock_region *rgn = &type->regions[i];
- phys_addr_t rend = rgn->base + rgn->size;
+ int i = 0;
- /* Exit if there's no possible hits */
- if (rgn->base > end || rgn->size == 0)
- break;
+ /* cnt never goes below 1 */
+ while (i < type->cnt - 1) {
+ struct memblock_region *this = &type->regions[i];
+ struct memblock_region *next = &type->regions[i + 1];
- /* Check if we are fully enclosed within an existing
- * block
- */
- if (rgn->base <= base && rend >= end)
- return 0;
+ if (this->base + this->size != next->base ||
+ memblock_get_region_node(this) !=
+ memblock_get_region_node(next)) {
+ BUG_ON(this->base + this->size > next->base);
+ i++;
+ continue;
+ }
- /* Check if we overlap or are adjacent with the bottom
- * of a block.
- */
- if (base < rgn->base && end >= rgn->base) {
- /* If we can't coalesce, create a new block */
- if (!memblock_memory_can_coalesce(base, size,
- rgn->base,
- rgn->size)) {
- /* Overlap & can't coalesce are mutually
- * exclusive, if you do that, be prepared
- * for trouble
- */
- WARN_ON(end != rgn->base);
- goto new_block;
- }
- /* We extend the bottom of the block down to our
- * base
- */
- rgn->base = base;
- rgn->size = rend - base;
+ this->size += next->size;
+ memmove(next, next + 1, (type->cnt - (i + 1)) * sizeof(*next));
+ type->cnt--;
+ }
+}
- /* Return if we have nothing else to allocate
- * (fully coalesced)
- */
- if (rend >= end)
- return 0;
+/**
+ * memblock_insert_region - insert new memblock region
+ * @type: memblock type to insert into
+ * @idx: index for the insertion point
+ * @base: base address of the new region
+ * @size: size of the new region
+ *
+ * Insert new memblock region [@base,@base+@size) into @type at @idx.
+ * @type must already have extra room to accomodate the new region.
+ */
+static void __init_memblock memblock_insert_region(struct memblock_type *type,
+ int idx, phys_addr_t base,
+ phys_addr_t size, int nid)
+{
+ struct memblock_region *rgn = &type->regions[idx];
- /* We continue processing from the end of the
- * coalesced block.
- */
- base = rend;
- size = end - base;
- }
+ BUG_ON(type->cnt >= type->max);
+ memmove(rgn + 1, rgn, (type->cnt - idx) * sizeof(*rgn));
+ rgn->base = base;
+ rgn->size = size;
+ memblock_set_region_node(rgn, nid);
+ type->cnt++;
+ type->total_size += size;
+}
- /* Now check if we overlap or are adjacent with the
- * top of a block
- */
- if (base <= rend && end >= rend) {
- /* If we can't coalesce, create a new block */
- if (!memblock_memory_can_coalesce(rgn->base,
- rgn->size,
- base, size)) {
- /* Overlap & can't coalesce are mutually
- * exclusive, if you do that, be prepared
- * for trouble
- */
- WARN_ON(rend != base);
- goto new_block;
- }
- /* We adjust our base down to enclose the
- * original block and destroy it. It will be
- * part of our new allocation. Since we've
- * freed an entry, we know we won't fail
- * to allocate one later, so we won't risk
- * losing the original block allocation.
- */
- size += (base - rgn->base);
- base = rgn->base;
- memblock_remove_region(type, i--);
- }
- }
+/**
+ * memblock_add_region - add new memblock region
+ * @type: memblock type to add new region into
+ * @base: base address of the new region
+ * @size: size of the new region
+ * @nid: nid of the new region
+ *
+ * Add new memblock region [@base,@base+@size) into @type. The new region
+ * is allowed to overlap with existing ones - overlaps don't affect already
+ * existing regions. @type is guaranteed to be minimal (all neighbouring
+ * compatible regions are merged) after the addition.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+static int __init_memblock memblock_add_region(struct memblock_type *type,
+ phys_addr_t base, phys_addr_t size, int nid)
+{
+ bool insert = false;
+ phys_addr_t obase = base;
+ phys_addr_t end = base + memblock_cap_size(base, &size);
+ int i, nr_new;
- /* If the array is empty, special case, replace the fake
- * filler region and return
- */
- if ((type->cnt == 1) && (type->regions[0].size == 0)) {
+ /* special case for empty array */
+ if (type->regions[0].size == 0) {
+ WARN_ON(type->cnt != 1 || type->total_size);
type->regions[0].base = base;
type->regions[0].size = size;
+ memblock_set_region_node(&type->regions[0], nid);
+ type->total_size = size;
return 0;
}
-
- new_block:
- /* If we are out of space, we fail. It's too late to resize the array
- * but then this shouldn't have happened in the first place.
+repeat:
+ /*
+ * The following is executed twice. Once with %false @insert and
+ * then with %true. The first counts the number of regions needed
+ * to accomodate the new area. The second actually inserts them.
*/
- if (WARN_ON(type->cnt >= type->max))
- return -1;
+ base = obase;
+ nr_new = 0;
- /* Couldn't coalesce the MEMBLOCK, so add it to the sorted table. */
- for (i = type->cnt - 1; i >= 0; i--) {
- if (base < type->regions[i].base) {
- type->regions[i+1].base = type->regions[i].base;
- type->regions[i+1].size = type->regions[i].size;
- } else {
- type->regions[i+1].base = base;
- type->regions[i+1].size = size;
- slot = i + 1;
+ for (i = 0; i < type->cnt; i++) {
+ struct memblock_region *rgn = &type->regions[i];
+ phys_addr_t rbase = rgn->base;
+ phys_addr_t rend = rbase + rgn->size;
+
+ if (rbase >= end)
break;
+ if (rend <= base)
+ continue;
+ /*
+ * @rgn overlaps. If it separates the lower part of new
+ * area, insert that portion.
+ */
+ if (rbase > base) {
+ nr_new++;
+ if (insert)
+ memblock_insert_region(type, i++, base,
+ rbase - base, nid);
}
+ /* area below @rend is dealt with, forget about it */
+ base = min(rend, end);
}
- if (base < type->regions[0].base) {
- type->regions[0].base = base;
- type->regions[0].size = size;
- slot = 0;
+
+ /* insert the remaining portion */
+ if (base < end) {
+ nr_new++;
+ if (insert)
+ memblock_insert_region(type, i, base, end - base, nid);
}
- type->cnt++;
- /* The array is full ? Try to resize it. If that fails, we undo
- * our allocation and return an error
+ /*
+ * If this was the first round, resize array and repeat for actual
+ * insertions; otherwise, merge and return.
*/
- if (type->cnt == type->max && memblock_double_array(type)) {
- BUG_ON(slot < 0);
- memblock_remove_region(type, slot);
- return -1;
+ if (!insert) {
+ while (type->cnt + nr_new > type->max)
+ if (memblock_double_array(type) < 0)
+ return -ENOMEM;
+ insert = true;
+ goto repeat;
+ } else {
+ memblock_merge_regions(type);
+ return 0;
}
-
- return 0;
}
-long __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
+int __init_memblock memblock_add_node(phys_addr_t base, phys_addr_t size,
+ int nid)
{
- return memblock_add_region(&memblock.memory, base, size);
+ return memblock_add_region(&memblock.memory, base, size, nid);
+}
+int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
+{
+ return memblock_add_region(&memblock.memory, base, size, MAX_NUMNODES);
}
-static long __init_memblock __memblock_remove(struct memblock_type *type,
- phys_addr_t base, phys_addr_t size)
+/**
+ * memblock_isolate_range - isolate given range into disjoint memblocks
+ * @type: memblock type to isolate range for
+ * @base: base of range to isolate
+ * @size: size of range to isolate
+ * @start_rgn: out parameter for the start of isolated region
+ * @end_rgn: out parameter for the end of isolated region
+ *
+ * Walk @type and ensure that regions don't cross the boundaries defined by
+ * [@base,@base+@size). Crossing regions are split at the boundaries,
+ * which may create at most two more regions. The index of the first
+ * region inside the range is returned in *@start_rgn and end in *@end_rgn.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+static int __init_memblock memblock_isolate_range(struct memblock_type *type,
+ phys_addr_t base, phys_addr_t size,
+ int *start_rgn, int *end_rgn)
{
- phys_addr_t end = base + size;
+ phys_addr_t end = base + memblock_cap_size(base, &size);
int i;
- /* Walk through the array for collisions */
+ *start_rgn = *end_rgn = 0;
+
+ /* we'll create at most two more regions */
+ while (type->cnt + 2 > type->max)
+ if (memblock_double_array(type) < 0)
+ return -ENOMEM;
+
for (i = 0; i < type->cnt; i++) {
struct memblock_region *rgn = &type->regions[i];
- phys_addr_t rend = rgn->base + rgn->size;
+ phys_addr_t rbase = rgn->base;
+ phys_addr_t rend = rbase + rgn->size;
- /* Nothing more to do, exit */
- if (rgn->base > end || rgn->size == 0)
+ if (rbase >= end)
break;
-
- /* If we fully enclose the block, drop it */
- if (base <= rgn->base && end >= rend) {
- memblock_remove_region(type, i--);
+ if (rend <= base)
continue;
- }
- /* If we are fully enclosed within a block
- * then we need to split it and we are done
- */
- if (base > rgn->base && end < rend) {
- rgn->size = base - rgn->base;
- if (!memblock_add_region(type, end, rend - end))
- return 0;
- /* Failure to split is bad, we at least
- * restore the block before erroring
+ if (rbase < base) {
+ /*
+ * @rgn intersects from below. Split and continue
+ * to process the next region - the new top half.
+ */
+ rgn->base = base;
+ rgn->size -= base - rbase;
+ type->total_size -= base - rbase;
+ memblock_insert_region(type, i, rbase, base - rbase,
+ memblock_get_region_node(rgn));
+ } else if (rend > end) {
+ /*
+ * @rgn intersects from above. Split and redo the
+ * current region - the new bottom half.
*/
- rgn->size = rend - rgn->base;
- WARN_ON(1);
- return -1;
- }
-
- /* Check if we need to trim the bottom of a block */
- if (rgn->base < end && rend > end) {
- rgn->size -= end - rgn->base;
rgn->base = end;
- break;
+ rgn->size -= end - rbase;
+ type->total_size -= end - rbase;
+ memblock_insert_region(type, i--, rbase, end - rbase,
+ memblock_get_region_node(rgn));
+ } else {
+ /* @rgn is fully contained, record it */
+ if (!*end_rgn)
+ *start_rgn = i;
+ *end_rgn = i + 1;
}
+ }
- /* And check if we need to trim the top of a block */
- if (base < rend)
- rgn->size -= rend - base;
+ return 0;
+}
- }
+static int __init_memblock __memblock_remove(struct memblock_type *type,
+ phys_addr_t base, phys_addr_t size)
+{
+ int start_rgn, end_rgn;
+ int i, ret;
+
+ ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
+ if (ret)
+ return ret;
+
+ for (i = end_rgn - 1; i >= start_rgn; i--)
+ memblock_remove_region(type, i);
return 0;
}
-long __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
+int __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
{
return __memblock_remove(&memblock.memory, base, size);
}
-long __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
+int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
{
+ memblock_dbg(" memblock_free: [%#016llx-%#016llx] %pF\n",
+ (unsigned long long)base,
+ (unsigned long long)base + size,
+ (void *)_RET_IP_);
+
return __memblock_remove(&memblock.reserved, base, size);
}
-long __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
+int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
{
struct memblock_type *_rgn = &memblock.reserved;
+ memblock_dbg("memblock_reserve: [%#016llx-%#016llx] %pF\n",
+ (unsigned long long)base,
+ (unsigned long long)base + size,
+ (void *)_RET_IP_);
BUG_ON(0 == size);
- return memblock_add_region(_rgn, base, size);
+ return memblock_add_region(_rgn, base, size, MAX_NUMNODES);
}
-phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
+/**
+ * __next_free_mem_range - next function for for_each_free_mem_range()
+ * @idx: pointer to u64 loop variable
+ * @nid: nid: node selector, %MAX_NUMNODES for all nodes
+ * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
+ * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
+ * @p_nid: ptr to int for nid of the range, can be %NULL
+ *
+ * Find the first free area from *@idx which matches @nid, fill the out
+ * parameters, and update *@idx for the next iteration. The lower 32bit of
+ * *@idx contains index into memory region and the upper 32bit indexes the
+ * areas before each reserved region. For example, if reserved regions
+ * look like the following,
+ *
+ * 0:[0-16), 1:[32-48), 2:[128-130)
+ *
+ * The upper 32bit indexes the following regions.
+ *
+ * 0:[0-0), 1:[16-32), 2:[48-128), 3:[130-MAX)
+ *
+ * As both region arrays are sorted, the function advances the two indices
+ * in lockstep and returns each intersection.
+ */
+void __init_memblock __next_free_mem_range(u64 *idx, int nid,
+ phys_addr_t *out_start,
+ phys_addr_t *out_end, int *out_nid)
{
- phys_addr_t found;
+ struct memblock_type *mem = &memblock.memory;
+ struct memblock_type *rsv = &memblock.reserved;
+ int mi = *idx & 0xffffffff;
+ int ri = *idx >> 32;
- /* We align the size to limit fragmentation. Without this, a lot of
- * small allocs quickly eat up the whole reserve array on sparc
- */
- size = memblock_align_up(size, align);
+ for ( ; mi < mem->cnt; mi++) {
+ struct memblock_region *m = &mem->regions[mi];
+ phys_addr_t m_start = m->base;
+ phys_addr_t m_end = m->base + m->size;
- found = memblock_find_base(size, align, 0, max_addr);
- if (found != MEMBLOCK_ERROR &&
- !memblock_add_region(&memblock.reserved, found, size))
- return found;
+ /* only memory regions are associated with nodes, check it */
+ if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
+ continue;
- return 0;
+ /* scan areas before each reservation for intersection */
+ for ( ; ri < rsv->cnt + 1; ri++) {
+ struct memblock_region *r = &rsv->regions[ri];
+ phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
+ phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX;
+
+ /* if ri advanced past mi, break out to advance mi */
+ if (r_start >= m_end)
+ break;
+ /* if the two regions intersect, we're done */
+ if (m_start < r_end) {
+ if (out_start)
+ *out_start = max(m_start, r_start);
+ if (out_end)
+ *out_end = min(m_end, r_end);
+ if (out_nid)
+ *out_nid = memblock_get_region_node(m);
+ /*
+ * The region which ends first is advanced
+ * for the next iteration.
+ */
+ if (m_end <= r_end)
+ mi++;
+ else
+ ri++;
+ *idx = (u32)mi | (u64)ri << 32;
+ return;
+ }
+ }
+ }
+
+ /* signal end of iteration */
+ *idx = ULLONG_MAX;
}
-phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
+/**
+ * __next_free_mem_range_rev - next function for for_each_free_mem_range_reverse()
+ * @idx: pointer to u64 loop variable
+ * @nid: nid: node selector, %MAX_NUMNODES for all nodes
+ * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
+ * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
+ * @p_nid: ptr to int for nid of the range, can be %NULL
+ *
+ * Reverse of __next_free_mem_range().
+ */
+void __init_memblock __next_free_mem_range_rev(u64 *idx, int nid,
+ phys_addr_t *out_start,
+ phys_addr_t *out_end, int *out_nid)
{
- phys_addr_t alloc;
+ struct memblock_type *mem = &memblock.memory;
+ struct memblock_type *rsv = &memblock.reserved;
+ int mi = *idx & 0xffffffff;
+ int ri = *idx >> 32;
- alloc = __memblock_alloc_base(size, align, max_addr);
+ if (*idx == (u64)ULLONG_MAX) {
+ mi = mem->cnt - 1;
+ ri = rsv->cnt;
+ }
- if (alloc == 0)
- panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
- (unsigned long long) size, (unsigned long long) max_addr);
+ for ( ; mi >= 0; mi--) {
+ struct memblock_region *m = &mem->regions[mi];
+ phys_addr_t m_start = m->base;
+ phys_addr_t m_end = m->base + m->size;
- return alloc;
-}
+ /* only memory regions are associated with nodes, check it */
+ if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
+ continue;
-phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
-{
- return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
-}
+ /* scan areas before each reservation for intersection */
+ for ( ; ri >= 0; ri--) {
+ struct memblock_region *r = &rsv->regions[ri];
+ phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
+ phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX;
+
+ /* if ri advanced past mi, break out to advance mi */
+ if (r_end <= m_start)
+ break;
+ /* if the two regions intersect, we're done */
+ if (m_end > r_start) {
+ if (out_start)
+ *out_start = max(m_start, r_start);
+ if (out_end)
+ *out_end = min(m_end, r_end);
+ if (out_nid)
+ *out_nid = memblock_get_region_node(m);
+
+ if (m_start >= r_start)
+ mi--;
+ else
+ ri--;
+ *idx = (u32)mi | (u64)ri << 32;
+ return;
+ }
+ }
+ }
+ *idx = ULLONG_MAX;
+}
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
/*
- * Additional node-local allocators. Search for node memory is bottom up
- * and walks memblock regions within that node bottom-up as well, but allocation
- * within an memblock region is top-down. XXX I plan to fix that at some stage
- *
- * WARNING: Only available after early_node_map[] has been populated,
- * on some architectures, that is after all the calls to add_active_range()
- * have been done to populate it.
+ * Common iterator interface used to define for_each_mem_range().
*/
-
-phys_addr_t __weak __init memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid)
+void __init_memblock __next_mem_pfn_range(int *idx, int nid,
+ unsigned long *out_start_pfn,
+ unsigned long *out_end_pfn, int *out_nid)
{
-#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
- /*
- * This code originates from sparc which really wants use to walk by addresses
- * and returns the nid. This is not very convenient for early_pfn_map[] users
- * as the map isn't sorted yet, and it really wants to be walked by nid.
- *
- * For now, I implement the inefficient method below which walks the early
- * map multiple times. Eventually we may want to use an ARCH config option
- * to implement a completely different method for both case.
- */
- unsigned long start_pfn, end_pfn;
- int i;
+ struct memblock_type *type = &memblock.memory;
+ struct memblock_region *r;
- for (i = 0; i < MAX_NUMNODES; i++) {
- get_pfn_range_for_nid(i, &start_pfn, &end_pfn);
- if (start < PFN_PHYS(start_pfn) || start >= PFN_PHYS(end_pfn))
+ while (++*idx < type->cnt) {
+ r = &type->regions[*idx];
+
+ if (PFN_UP(r->base) >= PFN_DOWN(r->base + r->size))
continue;
- *nid = i;
- return min(end, PFN_PHYS(end_pfn));
+ if (nid == MAX_NUMNODES || nid == r->nid)
+ break;
+ }
+ if (*idx >= type->cnt) {
+ *idx = -1;
+ return;
}
-#endif
- *nid = 0;
- return end;
+ if (out_start_pfn)
+ *out_start_pfn = PFN_UP(r->base);
+ if (out_end_pfn)
+ *out_end_pfn = PFN_DOWN(r->base + r->size);
+ if (out_nid)
+ *out_nid = r->nid;
}
-static phys_addr_t __init memblock_alloc_nid_region(struct memblock_region *mp,
- phys_addr_t size,
- phys_addr_t align, int nid)
+/**
+ * memblock_set_node - set node ID on memblock regions
+ * @base: base of area to set node ID for
+ * @size: size of area to set node ID for
+ * @nid: node ID to set
+ *
+ * Set the nid of memblock memory regions in [@base,@base+@size) to @nid.
+ * Regions which cross the area boundaries are split as necessary.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
+ int nid)
{
- phys_addr_t start, end;
+ struct memblock_type *type = &memblock.memory;
+ int start_rgn, end_rgn;
+ int i, ret;
- start = mp->base;
- end = start + mp->size;
+ ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
+ if (ret)
+ return ret;
- start = memblock_align_up(start, align);
- while (start < end) {
- phys_addr_t this_end;
- int this_nid;
+ for (i = start_rgn; i < end_rgn; i++)
+ type->regions[i].nid = nid;
- this_end = memblock_nid_range(start, end, &this_nid);
- if (this_nid == nid) {
- phys_addr_t ret = memblock_find_region(start, this_end, size, align);
- if (ret != MEMBLOCK_ERROR &&
- !memblock_add_region(&memblock.reserved, ret, size))
- return ret;
- }
- start = this_end;
- }
+ memblock_merge_regions(type);
+ return 0;
+}
+#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
+
+static phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size,
+ phys_addr_t align, phys_addr_t max_addr,
+ int nid)
+{
+ phys_addr_t found;
- return MEMBLOCK_ERROR;
+ found = memblock_find_in_range_node(0, max_addr, size, align, nid);
+ if (found && !memblock_reserve(found, size))
+ return found;
+
+ return 0;
}
phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
{
- struct memblock_type *mem = &memblock.memory;
- int i;
+ return memblock_alloc_base_nid(size, align, MEMBLOCK_ALLOC_ACCESSIBLE, nid);
+}
- BUG_ON(0 == size);
+phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
+{
+ return memblock_alloc_base_nid(size, align, max_addr, MAX_NUMNODES);
+}
- /* We align the size to limit fragmentation. Without this, a lot of
- * small allocs quickly eat up the whole reserve array on sparc
- */
- size = memblock_align_up(size, align);
+phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
+{
+ phys_addr_t alloc;
- /* We do a bottom-up search for a region with the right
- * nid since that's easier considering how memblock_nid_range()
- * works
- */
- for (i = 0; i < mem->cnt; i++) {
- phys_addr_t ret = memblock_alloc_nid_region(&mem->regions[i],
- size, align, nid);
- if (ret != MEMBLOCK_ERROR)
- return ret;
- }
+ alloc = __memblock_alloc_base(size, align, max_addr);
- return 0;
+ if (alloc == 0)
+ panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
+ (unsigned long long) size, (unsigned long long) max_addr);
+
+ return alloc;
+}
+
+phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
+{
+ return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
}
phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid)
@@ -613,7 +769,7 @@ phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, i
if (res)
return res;
- return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
+ return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
}
@@ -621,10 +777,9 @@ phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, i
* Remaining API functions
*/
-/* You must call memblock_analyze() before this. */
phys_addr_t __init memblock_phys_mem_size(void)
{
- return memblock.memory_size;
+ return memblock.memory.total_size;
}
/* lowest address */
@@ -640,45 +795,28 @@ phys_addr_t __init_memblock memblock_end_of_DRAM(void)
return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
}
-/* You must call memblock_analyze() after this. */
-void __init memblock_enforce_memory_limit(phys_addr_t memory_limit)
+void __init memblock_enforce_memory_limit(phys_addr_t limit)
{
unsigned long i;
- phys_addr_t limit;
- struct memblock_region *p;
+ phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX;
- if (!memory_limit)
+ if (!limit)
return;
- /* Truncate the memblock regions to satisfy the memory limit. */
- limit = memory_limit;
+ /* find out max address */
for (i = 0; i < memblock.memory.cnt; i++) {
- if (limit > memblock.memory.regions[i].size) {
- limit -= memblock.memory.regions[i].size;
- continue;
- }
-
- memblock.memory.regions[i].size = limit;
- memblock.memory.cnt = i + 1;
- break;
- }
-
- memory_limit = memblock_end_of_DRAM();
+ struct memblock_region *r = &memblock.memory.regions[i];
- /* And truncate any reserves above the limit also. */
- for (i = 0; i < memblock.reserved.cnt; i++) {
- p = &memblock.reserved.regions[i];
-
- if (p->base > memory_limit)
- p->size = 0;
- else if ((p->base + p->size) > memory_limit)
- p->size = memory_limit - p->base;
-
- if (p->size == 0) {
- memblock_remove_region(&memblock.reserved, i);
- i--;
+ if (limit <= r->size) {
+ max_addr = r->base + limit;
+ break;
}
+ limit -= r->size;
}
+
+ /* truncate both memory and reserved regions */
+ __memblock_remove(&memblock.memory, max_addr, (phys_addr_t)ULLONG_MAX);
+ __memblock_remove(&memblock.reserved, max_addr, (phys_addr_t)ULLONG_MAX);
}
static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr)
@@ -712,16 +850,18 @@ int __init_memblock memblock_is_memory(phys_addr_t addr)
int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
{
int idx = memblock_search(&memblock.memory, base);
+ phys_addr_t end = base + memblock_cap_size(base, &size);
if (idx == -1)
return 0;
return memblock.memory.regions[idx].base <= base &&
(memblock.memory.regions[idx].base +
- memblock.memory.regions[idx].size) >= (base + size);
+ memblock.memory.regions[idx].size) >= end;
}
int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
{
+ memblock_cap_size(base, &size);
return memblock_overlaps_region(&memblock.reserved, base, size) >= 0;
}
@@ -731,86 +871,45 @@ void __init_memblock memblock_set_current_limit(phys_addr_t limit)
memblock.current_limit = limit;
}
-static void __init_memblock memblock_dump(struct memblock_type *region, char *name)
+static void __init_memblock memblock_dump(struct memblock_type *type, char *name)
{
unsigned long long base, size;
int i;
- pr_info(" %s.cnt = 0x%lx\n", name, region->cnt);
+ pr_info(" %s.cnt = 0x%lx\n", name, type->cnt);
- for (i = 0; i < region->cnt; i++) {
- base = region->regions[i].base;
- size = region->regions[i].size;
-
- pr_info(" %s[%#x]\t[%#016llx-%#016llx], %#llx bytes\n",
- name, i, base, base + size - 1, size);
+ for (i = 0; i < type->cnt; i++) {
+ struct memblock_region *rgn = &type->regions[i];
+ char nid_buf[32] = "";
+
+ base = rgn->base;
+ size = rgn->size;
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+ if (memblock_get_region_node(rgn) != MAX_NUMNODES)
+ snprintf(nid_buf, sizeof(nid_buf), " on node %d",
+ memblock_get_region_node(rgn));
+#endif
+ pr_info(" %s[%#x]\t[%#016llx-%#016llx], %#llx bytes%s\n",
+ name, i, base, base + size - 1, size, nid_buf);
}
}
-void __init_memblock memblock_dump_all(void)
+void __init_memblock __memblock_dump_all(void)
{
- if (!memblock_debug)
- return;
-
pr_info("MEMBLOCK configuration:\n");
- pr_info(" memory size = 0x%llx\n", (unsigned long long)memblock.memory_size);
+ pr_info(" memory size = %#llx reserved size = %#llx\n",
+ (unsigned long long)memblock.memory.total_size,
+ (unsigned long long)memblock.reserved.total_size);
memblock_dump(&memblock.memory, "memory");
memblock_dump(&memblock.reserved, "reserved");
}
-void __init memblock_analyze(void)
+void __init memblock_allow_resize(void)
{
- int i;
-
- /* Check marker in the unused last array entry */
- WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base
- != MEMBLOCK_INACTIVE);
- WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base
- != MEMBLOCK_INACTIVE);
-
- memblock.memory_size = 0;
-
- for (i = 0; i < memblock.memory.cnt; i++)
- memblock.memory_size += memblock.memory.regions[i].size;
-
- /* We allow resizing from there */
memblock_can_resize = 1;
}
-void __init memblock_init(void)
-{
- static int init_done __initdata = 0;
-
- if (init_done)
- return;
- init_done = 1;
-
- /* Hookup the initial arrays */
- memblock.memory.regions = memblock_memory_init_regions;
- memblock.memory.max = INIT_MEMBLOCK_REGIONS;
- memblock.reserved.regions = memblock_reserved_init_regions;
- memblock.reserved.max = INIT_MEMBLOCK_REGIONS;
-
- /* Write a marker in the unused last array entry */
- memblock.memory.regions[INIT_MEMBLOCK_REGIONS].base = MEMBLOCK_INACTIVE;
- memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = MEMBLOCK_INACTIVE;
-
- /* Create a dummy zero size MEMBLOCK which will get coalesced away later.
- * This simplifies the memblock_add() code below...
- */
- memblock.memory.regions[0].base = 0;
- memblock.memory.regions[0].size = 0;
- memblock.memory.cnt = 1;
-
- /* Ditto. */
- memblock.reserved.regions[0].base = 0;
- memblock.reserved.regions[0].size = 0;
- memblock.reserved.cnt = 1;
-
- memblock.current_limit = MEMBLOCK_ALLOC_ANYWHERE;
-}
-
static int __init early_memblock(char *p)
{
if (p && strstr(p, "debug"))
@@ -819,7 +918,7 @@ static int __init early_memblock(char *p)
}
early_param("memblock", early_memblock);
-#if defined(CONFIG_DEBUG_FS) && !defined(ARCH_DISCARD_MEMBLOCK)
+#if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK)
static int memblock_debug_show(struct seq_file *m, void *private)
{
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6aff93c98aca..602207be9853 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -50,6 +50,8 @@
#include <linux/cpu.h>
#include <linux/oom.h>
#include "internal.h"
+#include <net/sock.h>
+#include <net/tcp_memcontrol.h>
#include <asm/uaccess.h>
@@ -121,16 +123,22 @@ struct mem_cgroup_stat_cpu {
unsigned long targets[MEM_CGROUP_NTARGETS];
};
+struct mem_cgroup_reclaim_iter {
+ /* css_id of the last scanned hierarchy member */
+ int position;
+ /* scan generation, increased every round-trip */
+ unsigned int generation;
+};
+
/*
* per-zone information in memory controller.
*/
struct mem_cgroup_per_zone {
- /*
- * spin_lock to protect the per cgroup LRU
- */
- struct list_head lists[NR_LRU_LISTS];
+ struct lruvec lruvec;
unsigned long count[NR_LRU_LISTS];
+ struct mem_cgroup_reclaim_iter reclaim_iter[DEF_PRIORITY + 1];
+
struct zone_reclaim_stat reclaim_stat;
struct rb_node tree_node; /* RB tree node */
unsigned long long usage_in_excess;/* Set to the value by which */
@@ -231,11 +239,6 @@ struct mem_cgroup {
* per zone LRU lists.
*/
struct mem_cgroup_lru_info info;
- /*
- * While reclaiming in a hierarchy, we cache the last child we
- * reclaimed from.
- */
- int last_scanned_child;
int last_scanned_node;
#if MAX_NUMNODES > 1
nodemask_t scan_nodes;
@@ -286,6 +289,10 @@ struct mem_cgroup {
*/
struct mem_cgroup_stat_cpu nocpu_base;
spinlock_t pcp_counter_lock;
+
+#ifdef CONFIG_INET
+ struct tcp_memcontrol tcp_mem;
+#endif
};
/* Stuffs for move charges at task migration. */
@@ -360,12 +367,70 @@ enum charge_type {
#define MEM_CGROUP_RECLAIM_NOSWAP (1 << MEM_CGROUP_RECLAIM_NOSWAP_BIT)
#define MEM_CGROUP_RECLAIM_SHRINK_BIT 0x1
#define MEM_CGROUP_RECLAIM_SHRINK (1 << MEM_CGROUP_RECLAIM_SHRINK_BIT)
-#define MEM_CGROUP_RECLAIM_SOFT_BIT 0x2
-#define MEM_CGROUP_RECLAIM_SOFT (1 << MEM_CGROUP_RECLAIM_SOFT_BIT)
static void mem_cgroup_get(struct mem_cgroup *memcg);
static void mem_cgroup_put(struct mem_cgroup *memcg);
-static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
+
+/* Writing them here to avoid exposing memcg's inner layout */
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+#ifdef CONFIG_INET
+#include <net/sock.h>
+#include <net/ip.h>
+
+static bool mem_cgroup_is_root(struct mem_cgroup *memcg);
+void sock_update_memcg(struct sock *sk)
+{
+ if (static_branch(&memcg_socket_limit_enabled)) {
+ struct mem_cgroup *memcg;
+
+ BUG_ON(!sk->sk_prot->proto_cgroup);
+
+ /* Socket cloning can throw us here with sk_cgrp already
+ * filled. It won't however, necessarily happen from
+ * process context. So the test for root memcg given
+ * the current task's memcg won't help us in this case.
+ *
+ * Respecting the original socket's memcg is a better
+ * decision in this case.
+ */
+ if (sk->sk_cgrp) {
+ BUG_ON(mem_cgroup_is_root(sk->sk_cgrp->memcg));
+ mem_cgroup_get(sk->sk_cgrp->memcg);
+ return;
+ }
+
+ rcu_read_lock();
+ memcg = mem_cgroup_from_task(current);
+ if (!mem_cgroup_is_root(memcg)) {
+ mem_cgroup_get(memcg);
+ sk->sk_cgrp = sk->sk_prot->proto_cgroup(memcg);
+ }
+ rcu_read_unlock();
+ }
+}
+EXPORT_SYMBOL(sock_update_memcg);
+
+void sock_release_memcg(struct sock *sk)
+{
+ if (static_branch(&memcg_socket_limit_enabled) && sk->sk_cgrp) {
+ struct mem_cgroup *memcg;
+ WARN_ON(!sk->sk_cgrp->memcg);
+ memcg = sk->sk_cgrp->memcg;
+ mem_cgroup_put(memcg);
+ }
+}
+
+struct cg_proto *tcp_proto_cgroup(struct mem_cgroup *memcg)
+{
+ if (!memcg || mem_cgroup_is_root(memcg))
+ return NULL;
+
+ return &memcg->tcp_mem.cg_proto;
+}
+EXPORT_SYMBOL(tcp_proto_cgroup);
+#endif /* CONFIG_INET */
+#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
+
static void drain_all_stock_async(struct mem_cgroup *memcg);
static struct mem_cgroup_per_zone *
@@ -500,7 +565,7 @@ static void mem_cgroup_remove_from_trees(struct mem_cgroup *memcg)
struct mem_cgroup_per_zone *mz;
struct mem_cgroup_tree_per_zone *mctz;
- for_each_node_state(node, N_POSSIBLE) {
+ for_each_node(node) {
for (zone = 0; zone < MAX_NR_ZONES; zone++) {
mz = mem_cgroup_zoneinfo(memcg, node, zone);
mctz = soft_limit_tree_node_zone(node, zone);
@@ -590,16 +655,6 @@ static void mem_cgroup_swap_statistics(struct mem_cgroup *memcg,
this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_SWAPOUT], val);
}
-void mem_cgroup_pgfault(struct mem_cgroup *memcg, int val)
-{
- this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT], val);
-}
-
-void mem_cgroup_pgmajfault(struct mem_cgroup *memcg, int val)
-{
- this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT], val);
-}
-
static unsigned long mem_cgroup_read_events(struct mem_cgroup *memcg,
enum mem_cgroup_events_index idx)
{
@@ -683,37 +738,32 @@ static unsigned long mem_cgroup_nr_lru_pages(struct mem_cgroup *memcg,
return total;
}
-static bool __memcg_event_check(struct mem_cgroup *memcg, int target)
+static bool mem_cgroup_event_ratelimit(struct mem_cgroup *memcg,
+ enum mem_cgroup_events_target target)
{
unsigned long val, next;
val = __this_cpu_read(memcg->stat->events[MEM_CGROUP_EVENTS_COUNT]);
next = __this_cpu_read(memcg->stat->targets[target]);
/* from time_after() in jiffies.h */
- return ((long)next - (long)val < 0);
-}
-
-static void __mem_cgroup_target_update(struct mem_cgroup *memcg, int target)
-{
- unsigned long val, next;
-
- val = __this_cpu_read(memcg->stat->events[MEM_CGROUP_EVENTS_COUNT]);
-
- switch (target) {
- case MEM_CGROUP_TARGET_THRESH:
- next = val + THRESHOLDS_EVENTS_TARGET;
- break;
- case MEM_CGROUP_TARGET_SOFTLIMIT:
- next = val + SOFTLIMIT_EVENTS_TARGET;
- break;
- case MEM_CGROUP_TARGET_NUMAINFO:
- next = val + NUMAINFO_EVENTS_TARGET;
- break;
- default:
- return;
+ if ((long)next - (long)val < 0) {
+ switch (target) {
+ case MEM_CGROUP_TARGET_THRESH:
+ next = val + THRESHOLDS_EVENTS_TARGET;
+ break;
+ case MEM_CGROUP_TARGET_SOFTLIMIT:
+ next = val + SOFTLIMIT_EVENTS_TARGET;
+ break;
+ case MEM_CGROUP_TARGET_NUMAINFO:
+ next = val + NUMAINFO_EVENTS_TARGET;
+ break;
+ default:
+ break;
+ }
+ __this_cpu_write(memcg->stat->targets[target], next);
+ return true;
}
-
- __this_cpu_write(memcg->stat->targets[target], next);
+ return false;
}
/*
@@ -724,28 +774,30 @@ static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
{
preempt_disable();
/* threshold event is triggered in finer grain than soft limit */
- if (unlikely(__memcg_event_check(memcg, MEM_CGROUP_TARGET_THRESH))) {
+ if (unlikely(mem_cgroup_event_ratelimit(memcg,
+ MEM_CGROUP_TARGET_THRESH))) {
+ bool do_softlimit, do_numainfo;
+
+ do_softlimit = mem_cgroup_event_ratelimit(memcg,
+ MEM_CGROUP_TARGET_SOFTLIMIT);
+#if MAX_NUMNODES > 1
+ do_numainfo = mem_cgroup_event_ratelimit(memcg,
+ MEM_CGROUP_TARGET_NUMAINFO);
+#endif
+ preempt_enable();
+
mem_cgroup_threshold(memcg);
- __mem_cgroup_target_update(memcg, MEM_CGROUP_TARGET_THRESH);
- if (unlikely(__memcg_event_check(memcg,
- MEM_CGROUP_TARGET_SOFTLIMIT))) {
+ if (unlikely(do_softlimit))
mem_cgroup_update_tree(memcg, page);
- __mem_cgroup_target_update(memcg,
- MEM_CGROUP_TARGET_SOFTLIMIT);
- }
#if MAX_NUMNODES > 1
- if (unlikely(__memcg_event_check(memcg,
- MEM_CGROUP_TARGET_NUMAINFO))) {
+ if (unlikely(do_numainfo))
atomic_inc(&memcg->numainfo_events);
- __mem_cgroup_target_update(memcg,
- MEM_CGROUP_TARGET_NUMAINFO);
- }
#endif
- }
- preempt_enable();
+ } else
+ preempt_enable();
}
-static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
+struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
{
return container_of(cgroup_subsys_state(cont,
mem_cgroup_subsys_id), struct mem_cgroup,
@@ -787,83 +839,116 @@ struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
return memcg;
}
-/* The caller has to guarantee "mem" exists before calling this */
-static struct mem_cgroup *mem_cgroup_start_loop(struct mem_cgroup *memcg)
+/**
+ * mem_cgroup_iter - iterate over memory cgroup hierarchy
+ * @root: hierarchy root
+ * @prev: previously returned memcg, NULL on first invocation
+ * @reclaim: cookie for shared reclaim walks, NULL for full walks
+ *
+ * Returns references to children of the hierarchy below @root, or
+ * @root itself, or %NULL after a full round-trip.
+ *
+ * Caller must pass the return value in @prev on subsequent
+ * invocations for reference counting, or use mem_cgroup_iter_break()
+ * to cancel a hierarchy walk before the round-trip is complete.
+ *
+ * Reclaimers can specify a zone and a priority level in @reclaim to
+ * divide up the memcgs in the hierarchy among all concurrent
+ * reclaimers operating on the same zone and priority.
+ */
+struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
+ struct mem_cgroup *prev,
+ struct mem_cgroup_reclaim_cookie *reclaim)
{
- struct cgroup_subsys_state *css;
- int found;
+ struct mem_cgroup *memcg = NULL;
+ int id = 0;
- if (!memcg) /* ROOT cgroup has the smallest ID */
- return root_mem_cgroup; /*css_put/get against root is ignored*/
- if (!memcg->use_hierarchy) {
- if (css_tryget(&memcg->css))
- return memcg;
+ if (mem_cgroup_disabled())
return NULL;
- }
- rcu_read_lock();
- /*
- * searching a memory cgroup which has the smallest ID under given
- * ROOT cgroup. (ID >= 1)
- */
- css = css_get_next(&mem_cgroup_subsys, 1, &memcg->css, &found);
- if (css && css_tryget(css))
- memcg = container_of(css, struct mem_cgroup, css);
- else
- memcg = NULL;
- rcu_read_unlock();
- return memcg;
-}
-static struct mem_cgroup *mem_cgroup_get_next(struct mem_cgroup *iter,
- struct mem_cgroup *root,
- bool cond)
-{
- int nextid = css_id(&iter->css) + 1;
- int found;
- int hierarchy_used;
- struct cgroup_subsys_state *css;
+ if (!root)
+ root = root_mem_cgroup;
- hierarchy_used = iter->use_hierarchy;
+ if (prev && !reclaim)
+ id = css_id(&prev->css);
- css_put(&iter->css);
- /* If no ROOT, walk all, ignore hierarchy */
- if (!cond || (root && !hierarchy_used))
- return NULL;
+ if (prev && prev != root)
+ css_put(&prev->css);
- if (!root)
- root = root_mem_cgroup;
+ if (!root->use_hierarchy && root != root_mem_cgroup) {
+ if (prev)
+ return NULL;
+ return root;
+ }
- do {
- iter = NULL;
- rcu_read_lock();
+ while (!memcg) {
+ struct mem_cgroup_reclaim_iter *uninitialized_var(iter);
+ struct cgroup_subsys_state *css;
+
+ if (reclaim) {
+ int nid = zone_to_nid(reclaim->zone);
+ int zid = zone_idx(reclaim->zone);
+ struct mem_cgroup_per_zone *mz;
- css = css_get_next(&mem_cgroup_subsys, nextid,
- &root->css, &found);
- if (css && css_tryget(css))
- iter = container_of(css, struct mem_cgroup, css);
+ mz = mem_cgroup_zoneinfo(root, nid, zid);
+ iter = &mz->reclaim_iter[reclaim->priority];
+ if (prev && reclaim->generation != iter->generation)
+ return NULL;
+ id = iter->position;
+ }
+
+ rcu_read_lock();
+ css = css_get_next(&mem_cgroup_subsys, id + 1, &root->css, &id);
+ if (css) {
+ if (css == &root->css || css_tryget(css))
+ memcg = container_of(css,
+ struct mem_cgroup, css);
+ } else
+ id = 0;
rcu_read_unlock();
- /* If css is NULL, no more cgroups will be found */
- nextid = found + 1;
- } while (css && !iter);
- return iter;
+ if (reclaim) {
+ iter->position = id;
+ if (!css)
+ iter->generation++;
+ else if (!prev && memcg)
+ reclaim->generation = iter->generation;
+ }
+
+ if (prev && !css)
+ return NULL;
+ }
+ return memcg;
+}
+
+/**
+ * mem_cgroup_iter_break - abort a hierarchy walk prematurely
+ * @root: hierarchy root
+ * @prev: last visited hierarchy member as returned by mem_cgroup_iter()
+ */
+void mem_cgroup_iter_break(struct mem_cgroup *root,
+ struct mem_cgroup *prev)
+{
+ if (!root)
+ root = root_mem_cgroup;
+ if (prev && prev != root)
+ css_put(&prev->css);
}
+
/*
- * for_eacn_mem_cgroup_tree() for visiting all cgroup under tree. Please
- * be careful that "break" loop is not allowed. We have reference count.
- * Instead of that modify "cond" to be false and "continue" to exit the loop.
+ * Iteration constructs for visiting all cgroups (under a tree). If
+ * loops are exited prematurely (break), mem_cgroup_iter_break() must
+ * be used for reference counting.
*/
-#define for_each_mem_cgroup_tree_cond(iter, root, cond) \
- for (iter = mem_cgroup_start_loop(root);\
- iter != NULL;\
- iter = mem_cgroup_get_next(iter, root, cond))
-
-#define for_each_mem_cgroup_tree(iter, root) \
- for_each_mem_cgroup_tree_cond(iter, root, true)
-
-#define for_each_mem_cgroup_all(iter) \
- for_each_mem_cgroup_tree_cond(iter, NULL, true)
+#define for_each_mem_cgroup_tree(iter, root) \
+ for (iter = mem_cgroup_iter(root, NULL, NULL); \
+ iter != NULL; \
+ iter = mem_cgroup_iter(root, iter, NULL))
+#define for_each_mem_cgroup(iter) \
+ for (iter = mem_cgroup_iter(NULL, NULL, NULL); \
+ iter != NULL; \
+ iter = mem_cgroup_iter(NULL, iter, NULL))
static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
{
@@ -883,11 +968,11 @@ void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
goto out;
switch (idx) {
- case PGMAJFAULT:
- mem_cgroup_pgmajfault(memcg, 1);
- break;
case PGFAULT:
- mem_cgroup_pgfault(memcg, 1);
+ this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]);
+ break;
+ case PGMAJFAULT:
+ this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]);
break;
default:
BUG();
@@ -897,6 +982,27 @@ out:
}
EXPORT_SYMBOL(mem_cgroup_count_vm_event);
+/**
+ * mem_cgroup_zone_lruvec - get the lru list vector for a zone and memcg
+ * @zone: zone of the wanted lruvec
+ * @mem: memcg of the wanted lruvec
+ *
+ * Returns the lru list vector holding pages for the given @zone and
+ * @mem. This can be the global zone lruvec, if the memory controller
+ * is disabled.
+ */
+struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
+ struct mem_cgroup *memcg)
+{
+ struct mem_cgroup_per_zone *mz;
+
+ if (mem_cgroup_disabled())
+ return &zone->lruvec;
+
+ mz = mem_cgroup_zoneinfo(memcg, zone_to_nid(zone), zone_idx(zone));
+ return &mz->lruvec;
+}
+
/*
* Following LRU functions are allowed to be used without PCG_LOCK.
* Operations are called by routine of global LRU independently from memcg.
@@ -911,180 +1017,91 @@ EXPORT_SYMBOL(mem_cgroup_count_vm_event);
* When moving account, the page is not on LRU. It's isolated.
*/
-void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru)
-{
- struct page_cgroup *pc;
- struct mem_cgroup_per_zone *mz;
-
- if (mem_cgroup_disabled())
- return;
- pc = lookup_page_cgroup(page);
- /* can happen while we handle swapcache. */
- if (!TestClearPageCgroupAcctLRU(pc))
- return;
- VM_BUG_ON(!pc->mem_cgroup);
- /*
- * We don't check PCG_USED bit. It's cleared when the "page" is finally
- * removed from global LRU.
- */
- mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
- /* huge page split is done under lru_lock. so, we have no races. */
- MEM_CGROUP_ZSTAT(mz, lru) -= 1 << compound_order(page);
- if (mem_cgroup_is_root(pc->mem_cgroup))
- return;
- VM_BUG_ON(list_empty(&pc->lru));
- list_del_init(&pc->lru);
-}
-
-void mem_cgroup_del_lru(struct page *page)
-{
- mem_cgroup_del_lru_list(page, page_lru(page));
-}
-
-/*
- * Writeback is about to end against a page which has been marked for immediate
- * reclaim. If it still appears to be reclaimable, move it to the tail of the
- * inactive list.
+/**
+ * mem_cgroup_lru_add_list - account for adding an lru page and return lruvec
+ * @zone: zone of the page
+ * @page: the page
+ * @lru: current lru
+ *
+ * This function accounts for @page being added to @lru, and returns
+ * the lruvec for the given @zone and the memcg @page is charged to.
+ *
+ * The callsite is then responsible for physically linking the page to
+ * the returned lruvec->lists[@lru].
*/
-void mem_cgroup_rotate_reclaimable_page(struct page *page)
+struct lruvec *mem_cgroup_lru_add_list(struct zone *zone, struct page *page,
+ enum lru_list lru)
{
struct mem_cgroup_per_zone *mz;
+ struct mem_cgroup *memcg;
struct page_cgroup *pc;
- enum lru_list lru = page_lru(page);
if (mem_cgroup_disabled())
- return;
+ return &zone->lruvec;
pc = lookup_page_cgroup(page);
- /* unused or root page is not rotated. */
- if (!PageCgroupUsed(pc))
- return;
- /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
- smp_rmb();
- if (mem_cgroup_is_root(pc->mem_cgroup))
- return;
- mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
- list_move_tail(&pc->lru, &mz->lists[lru]);
+ memcg = pc->mem_cgroup;
+ mz = page_cgroup_zoneinfo(memcg, page);
+ /* compound_order() is stabilized through lru_lock */
+ MEM_CGROUP_ZSTAT(mz, lru) += 1 << compound_order(page);
+ return &mz->lruvec;
}
-void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru)
+/**
+ * mem_cgroup_lru_del_list - account for removing an lru page
+ * @page: the page
+ * @lru: target lru
+ *
+ * This function accounts for @page being removed from @lru.
+ *
+ * The callsite is then responsible for physically unlinking
+ * @page->lru.
+ */
+void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru)
{
struct mem_cgroup_per_zone *mz;
+ struct mem_cgroup *memcg;
struct page_cgroup *pc;
if (mem_cgroup_disabled())
return;
pc = lookup_page_cgroup(page);
- /* unused or root page is not rotated. */
- if (!PageCgroupUsed(pc))
- return;
- /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
- smp_rmb();
- if (mem_cgroup_is_root(pc->mem_cgroup))
- return;
- mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
- list_move(&pc->lru, &mz->lists[lru]);
-}
-
-void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru)
-{
- struct page_cgroup *pc;
- struct mem_cgroup_per_zone *mz;
-
- if (mem_cgroup_disabled())
- return;
- pc = lookup_page_cgroup(page);
- VM_BUG_ON(PageCgroupAcctLRU(pc));
- /*
- * putback: charge:
- * SetPageLRU SetPageCgroupUsed
- * smp_mb smp_mb
- * PageCgroupUsed && add to memcg LRU PageLRU && add to memcg LRU
- *
- * Ensure that one of the two sides adds the page to the memcg
- * LRU during a race.
- */
- smp_mb();
- if (!PageCgroupUsed(pc))
- return;
- /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
- smp_rmb();
- mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
+ memcg = pc->mem_cgroup;
+ VM_BUG_ON(!memcg);
+ mz = page_cgroup_zoneinfo(memcg, page);
/* huge page split is done under lru_lock. so, we have no races. */
- MEM_CGROUP_ZSTAT(mz, lru) += 1 << compound_order(page);
- SetPageCgroupAcctLRU(pc);
- if (mem_cgroup_is_root(pc->mem_cgroup))
- return;
- list_add(&pc->lru, &mz->lists[lru]);
+ VM_BUG_ON(MEM_CGROUP_ZSTAT(mz, lru) < (1 << compound_order(page)));
+ MEM_CGROUP_ZSTAT(mz, lru) -= 1 << compound_order(page);
}
-/*
- * At handling SwapCache and other FUSE stuff, pc->mem_cgroup may be changed
- * while it's linked to lru because the page may be reused after it's fully
- * uncharged. To handle that, unlink page_cgroup from LRU when charge it again.
- * It's done under lock_page and expected that zone->lru_lock isnever held.
- */
-static void mem_cgroup_lru_del_before_commit(struct page *page)
+void mem_cgroup_lru_del(struct page *page)
{
- unsigned long flags;
- struct zone *zone = page_zone(page);
- struct page_cgroup *pc = lookup_page_cgroup(page);
-
- /*
- * Doing this check without taking ->lru_lock seems wrong but this
- * is safe. Because if page_cgroup's USED bit is unset, the page
- * will not be added to any memcg's LRU. If page_cgroup's USED bit is
- * set, the commit after this will fail, anyway.
- * This all charge/uncharge is done under some mutual execustion.
- * So, we don't need to taking care of changes in USED bit.
- */
- if (likely(!PageLRU(page)))
- return;
-
- spin_lock_irqsave(&zone->lru_lock, flags);
- /*
- * Forget old LRU when this page_cgroup is *not* used. This Used bit
- * is guarded by lock_page() because the page is SwapCache.
- */
- if (!PageCgroupUsed(pc))
- mem_cgroup_del_lru_list(page, page_lru(page));
- spin_unlock_irqrestore(&zone->lru_lock, flags);
+ mem_cgroup_lru_del_list(page, page_lru(page));
}
-static void mem_cgroup_lru_add_after_commit(struct page *page)
-{
- unsigned long flags;
- struct zone *zone = page_zone(page);
- struct page_cgroup *pc = lookup_page_cgroup(page);
- /*
- * putback: charge:
- * SetPageLRU SetPageCgroupUsed
- * smp_mb smp_mb
- * PageCgroupUsed && add to memcg LRU PageLRU && add to memcg LRU
- *
- * Ensure that one of the two sides adds the page to the memcg
- * LRU during a race.
- */
- smp_mb();
- /* taking care of that the page is added to LRU while we commit it */
- if (likely(!PageLRU(page)))
- return;
- spin_lock_irqsave(&zone->lru_lock, flags);
- /* link when the page is linked to LRU but page_cgroup isn't */
- if (PageLRU(page) && !PageCgroupAcctLRU(pc))
- mem_cgroup_add_lru_list(page, page_lru(page));
- spin_unlock_irqrestore(&zone->lru_lock, flags);
-}
-
-
-void mem_cgroup_move_lists(struct page *page,
- enum lru_list from, enum lru_list to)
+/**
+ * mem_cgroup_lru_move_lists - account for moving a page between lrus
+ * @zone: zone of the page
+ * @page: the page
+ * @from: current lru
+ * @to: target lru
+ *
+ * This function accounts for @page being moved between the lrus @from
+ * and @to, and returns the lruvec for the given @zone and the memcg
+ * @page is charged to.
+ *
+ * The callsite is then responsible for physically relinking
+ * @page->lru to the returned lruvec->lists[@to].
+ */
+struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone,
+ struct page *page,
+ enum lru_list from,
+ enum lru_list to)
{
- if (mem_cgroup_disabled())
- return;
- mem_cgroup_del_lru_list(page, from);
- mem_cgroup_add_lru_list(page, to);
+ /* XXX: Optimize this, especially for @from == @to */
+ mem_cgroup_lru_del_list(page, from);
+ return mem_cgroup_lru_add_list(zone, page, to);
}
/*
@@ -1109,10 +1126,21 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg)
struct task_struct *p;
p = find_lock_task_mm(task);
- if (!p)
- return 0;
- curr = try_get_mem_cgroup_from_mm(p->mm);
- task_unlock(p);
+ if (p) {
+ curr = try_get_mem_cgroup_from_mm(p->mm);
+ task_unlock(p);
+ } else {
+ /*
+ * All threads may have already detached their mm's, but the oom
+ * killer still needs to detect if they have already been oom
+ * killed to prevent needlessly killing additional tasks.
+ */
+ task_lock(task);
+ curr = mem_cgroup_from_task(task);
+ if (curr)
+ css_get(&curr->css);
+ task_unlock(task);
+ }
if (!curr)
return 0;
/*
@@ -1192,68 +1220,6 @@ mem_cgroup_get_reclaim_stat_from_page(struct page *page)
return &mz->reclaim_stat;
}
-unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
- struct list_head *dst,
- unsigned long *scanned, int order,
- isolate_mode_t mode,
- struct zone *z,
- struct mem_cgroup *mem_cont,
- int active, int file)
-{
- unsigned long nr_taken = 0;
- struct page *page;
- unsigned long scan;
- LIST_HEAD(pc_list);
- struct list_head *src;
- struct page_cgroup *pc, *tmp;
- int nid = zone_to_nid(z);
- int zid = zone_idx(z);
- struct mem_cgroup_per_zone *mz;
- int lru = LRU_FILE * file + active;
- int ret;
-
- BUG_ON(!mem_cont);
- mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
- src = &mz->lists[lru];
-
- scan = 0;
- list_for_each_entry_safe_reverse(pc, tmp, src, lru) {
- if (scan >= nr_to_scan)
- break;
-
- if (unlikely(!PageCgroupUsed(pc)))
- continue;
-
- page = lookup_cgroup_page(pc);
-
- if (unlikely(!PageLRU(page)))
- continue;
-
- scan++;
- ret = __isolate_lru_page(page, mode, file);
- switch (ret) {
- case 0:
- list_move(&page->lru, dst);
- mem_cgroup_del_lru(page);
- nr_taken += hpage_nr_pages(page);
- break;
- case -EBUSY:
- /* we don't affect global LRU but rotate in our LRU */
- mem_cgroup_rotate_lru_list(page, page_lru(page));
- break;
- default:
- break;
- }
- }
-
- *scanned = scan;
-
- trace_mm_vmscan_memcg_isolate(0, nr_to_scan, scan, nr_taken,
- 0, 0, 0, mode);
-
- return nr_taken;
-}
-
#define mem_cgroup_from_res_counter(counter, member) \
container_of(counter, struct mem_cgroup, member)
@@ -1470,41 +1436,40 @@ u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
return min(limit, memsw);
}
-/*
- * Visit the first child (need not be the first child as per the ordering
- * of the cgroup list, since we track last_scanned_child) of @mem and use
- * that to reclaim free pages from.
- */
-static struct mem_cgroup *
-mem_cgroup_select_victim(struct mem_cgroup *root_memcg)
+static unsigned long mem_cgroup_reclaim(struct mem_cgroup *memcg,
+ gfp_t gfp_mask,
+ unsigned long flags)
{
- struct mem_cgroup *ret = NULL;
- struct cgroup_subsys_state *css;
- int nextid, found;
-
- if (!root_memcg->use_hierarchy) {
- css_get(&root_memcg->css);
- ret = root_memcg;
- }
+ unsigned long total = 0;
+ bool noswap = false;
+ int loop;
- while (!ret) {
- rcu_read_lock();
- nextid = root_memcg->last_scanned_child + 1;
- css = css_get_next(&mem_cgroup_subsys, nextid, &root_memcg->css,
- &found);
- if (css && css_tryget(css))
- ret = container_of(css, struct mem_cgroup, css);
+ if (flags & MEM_CGROUP_RECLAIM_NOSWAP)
+ noswap = true;
+ if (!(flags & MEM_CGROUP_RECLAIM_SHRINK) && memcg->memsw_is_minimum)
+ noswap = true;
- rcu_read_unlock();
- /* Updates scanning parameter */
- if (!css) {
- /* this means start scan from ID:1 */
- root_memcg->last_scanned_child = 0;
- } else
- root_memcg->last_scanned_child = found;
+ for (loop = 0; loop < MEM_CGROUP_MAX_RECLAIM_LOOPS; loop++) {
+ if (loop)
+ drain_all_stock_async(memcg);
+ total += try_to_free_mem_cgroup_pages(memcg, gfp_mask, noswap);
+ /*
+ * Allow limit shrinkers, which are triggered directly
+ * by userspace, to catch signals and stop reclaim
+ * after minimal progress, regardless of the margin.
+ */
+ if (total && (flags & MEM_CGROUP_RECLAIM_SHRINK))
+ break;
+ if (mem_cgroup_margin(memcg))
+ break;
+ /*
+ * If nothing was reclaimed after two attempts, there
+ * may be no reclaimable pages in this hierarchy.
+ */
+ if (loop && !total)
+ break;
}
-
- return ret;
+ return total;
}
/**
@@ -1644,61 +1609,35 @@ bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
}
#endif
-/*
- * Scan the hierarchy if needed to reclaim memory. We remember the last child
- * we reclaimed from, so that we don't end up penalizing one child extensively
- * based on its position in the children list.
- *
- * root_memcg is the original ancestor that we've been reclaim from.
- *
- * We give up and return to the caller when we visit root_memcg twice.
- * (other groups can be removed while we're walking....)
- *
- * If shrink==true, for avoiding to free too much, this returns immedieately.
- */
-static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_memcg,
- struct zone *zone,
- gfp_t gfp_mask,
- unsigned long reclaim_options,
- unsigned long *total_scanned)
-{
- struct mem_cgroup *victim;
- int ret, total = 0;
+static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg,
+ struct zone *zone,
+ gfp_t gfp_mask,
+ unsigned long *total_scanned)
+{
+ struct mem_cgroup *victim = NULL;
+ int total = 0;
int loop = 0;
- bool noswap = reclaim_options & MEM_CGROUP_RECLAIM_NOSWAP;
- bool shrink = reclaim_options & MEM_CGROUP_RECLAIM_SHRINK;
- bool check_soft = reclaim_options & MEM_CGROUP_RECLAIM_SOFT;
unsigned long excess;
unsigned long nr_scanned;
+ struct mem_cgroup_reclaim_cookie reclaim = {
+ .zone = zone,
+ .priority = 0,
+ };
excess = res_counter_soft_limit_excess(&root_memcg->res) >> PAGE_SHIFT;
- /* If memsw_is_minimum==1, swap-out is of-no-use. */
- if (!check_soft && !shrink && root_memcg->memsw_is_minimum)
- noswap = true;
-
while (1) {
- victim = mem_cgroup_select_victim(root_memcg);
- if (victim == root_memcg) {
+ victim = mem_cgroup_iter(root_memcg, victim, &reclaim);
+ if (!victim) {
loop++;
- /*
- * We are not draining per cpu cached charges during
- * soft limit reclaim because global reclaim doesn't
- * care about charges. It tries to free some memory and
- * charges will not give any.
- */
- if (!check_soft && loop >= 1)
- drain_all_stock_async(root_memcg);
if (loop >= 2) {
/*
* If we have not been able to reclaim
* anything, it might because there are
* no reclaimable pages under this hierarchy
*/
- if (!check_soft || !total) {
- css_put(&victim->css);
+ if (!total)
break;
- }
/*
* We want to do more targeted reclaim.
* excess >> 2 is not to excessive so as to
@@ -1706,40 +1645,20 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_memcg,
* coming back to reclaim from this cgroup
*/
if (total >= (excess >> 2) ||
- (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) {
- css_put(&victim->css);
+ (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS))
break;
- }
}
- }
- if (!mem_cgroup_reclaimable(victim, noswap)) {
- /* this cgroup's local usage == 0 */
- css_put(&victim->css);
continue;
}
- /* we use swappiness of local cgroup */
- if (check_soft) {
- ret = mem_cgroup_shrink_node_zone(victim, gfp_mask,
- noswap, zone, &nr_scanned);
- *total_scanned += nr_scanned;
- } else
- ret = try_to_free_mem_cgroup_pages(victim, gfp_mask,
- noswap);
- css_put(&victim->css);
- /*
- * At shrinking usage, we can't check we should stop here or
- * reclaim more. It's depends on callers. last_scanned_child
- * will work enough for keeping fairness under tree.
- */
- if (shrink)
- return ret;
- total += ret;
- if (check_soft) {
- if (!res_counter_soft_limit_excess(&root_memcg->res))
- return total;
- } else if (mem_cgroup_margin(root_memcg))
- return total;
+ if (!mem_cgroup_reclaimable(victim, false))
+ continue;
+ total += mem_cgroup_shrink_node_zone(victim, gfp_mask, false,
+ zone, &nr_scanned);
+ *total_scanned += nr_scanned;
+ if (!res_counter_soft_limit_excess(&root_memcg->res))
+ break;
}
+ mem_cgroup_iter_break(root_memcg, victim);
return total;
}
@@ -1751,16 +1670,16 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_memcg,
static bool mem_cgroup_oom_lock(struct mem_cgroup *memcg)
{
struct mem_cgroup *iter, *failed = NULL;
- bool cond = true;
- for_each_mem_cgroup_tree_cond(iter, memcg, cond) {
+ for_each_mem_cgroup_tree(iter, memcg) {
if (iter->oom_lock) {
/*
* this subtree of our hierarchy is already locked
* so we cannot give a lock.
*/
failed = iter;
- cond = false;
+ mem_cgroup_iter_break(memcg, iter);
+ break;
} else
iter->oom_lock = true;
}
@@ -1772,11 +1691,10 @@ static bool mem_cgroup_oom_lock(struct mem_cgroup *memcg)
* OK, we failed to lock the whole subtree so we have to clean up
* what we set up to the failing subtree
*/
- cond = true;
- for_each_mem_cgroup_tree_cond(iter, memcg, cond) {
+ for_each_mem_cgroup_tree(iter, memcg) {
if (iter == failed) {
- cond = false;
- continue;
+ mem_cgroup_iter_break(memcg, iter);
+ break;
}
iter->oom_lock = false;
}
@@ -1941,7 +1859,7 @@ void mem_cgroup_update_page_stat(struct page *page,
bool need_unlock = false;
unsigned long uninitialized_var(flags);
- if (unlikely(!pc))
+ if (mem_cgroup_disabled())
return;
rcu_read_lock();
@@ -2172,7 +2090,7 @@ static int __cpuinit memcg_cpu_hotplug_callback(struct notifier_block *nb,
struct mem_cgroup *iter;
if ((action == CPU_ONLINE)) {
- for_each_mem_cgroup_all(iter)
+ for_each_mem_cgroup(iter)
synchronize_mem_cgroup_on_move(iter, cpu);
return NOTIFY_OK;
}
@@ -2180,7 +2098,7 @@ static int __cpuinit memcg_cpu_hotplug_callback(struct notifier_block *nb,
if ((action != CPU_DEAD) || action != CPU_DEAD_FROZEN)
return NOTIFY_OK;
- for_each_mem_cgroup_all(iter)
+ for_each_mem_cgroup(iter)
mem_cgroup_drain_pcp_counter(iter, cpu);
stock = &per_cpu(memcg_stock, cpu);
@@ -2234,8 +2152,7 @@ static int mem_cgroup_do_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
if (!(gfp_mask & __GFP_WAIT))
return CHARGE_WOULDBLOCK;
- ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, NULL,
- gfp_mask, flags, NULL);
+ ret = mem_cgroup_reclaim(mem_over_limit, gfp_mask, flags);
if (mem_cgroup_margin(mem_over_limit) >= nr_pages)
return CHARGE_RETRY;
/*
@@ -2268,8 +2185,25 @@ static int mem_cgroup_do_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
}
/*
- * Unlike exported interface, "oom" parameter is added. if oom==true,
- * oom-killer can be invoked.
+ * __mem_cgroup_try_charge() does
+ * 1. detect memcg to be charged against from passed *mm and *ptr,
+ * 2. update res_counter
+ * 3. call memory reclaim if necessary.
+ *
+ * In some special case, if the task is fatal, fatal_signal_pending() or
+ * has TIF_MEMDIE, this function returns -EINTR while writing root_mem_cgroup
+ * to *ptr. There are two reasons for this. 1: fatal threads should quit as soon
+ * as possible without any hazards. 2: all pages should have a valid
+ * pc->mem_cgroup. If mm is NULL and the caller doesn't pass a valid memcg
+ * pointer, that is treated as a charge to root_mem_cgroup.
+ *
+ * So __mem_cgroup_try_charge() will return
+ * 0 ... on success, filling *ptr with a valid memcg pointer.
+ * -ENOMEM ... charge failure because of resource limits.
+ * -EINTR ... if thread is fatal. *ptr is filled with root_mem_cgroup.
+ *
+ * Unlike the exported interface, an "oom" parameter is added. if oom==true,
+ * the oom-killer can be invoked.
*/
static int __mem_cgroup_try_charge(struct mm_struct *mm,
gfp_t gfp_mask,
@@ -2298,7 +2232,7 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
* set, if so charge the init_mm (happens for pagecache usage).
*/
if (!*ptr && !mm)
- goto bypass;
+ *ptr = root_mem_cgroup;
again:
if (*ptr) { /* css should be a valid one */
memcg = *ptr;
@@ -2324,7 +2258,9 @@ again:
* task-struct. So, mm->owner can be NULL.
*/
memcg = mem_cgroup_from_task(p);
- if (!memcg || mem_cgroup_is_root(memcg)) {
+ if (!memcg)
+ memcg = root_mem_cgroup;
+ if (mem_cgroup_is_root(memcg)) {
rcu_read_unlock();
goto done;
}
@@ -2399,8 +2335,8 @@ nomem:
*ptr = NULL;
return -ENOMEM;
bypass:
- *ptr = NULL;
- return 0;
+ *ptr = root_mem_cgroup;
+ return -EINTR;
}
/*
@@ -2456,7 +2392,7 @@ struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
memcg = NULL;
} else if (PageSwapCache(page)) {
ent.val = page_private(page);
- id = lookup_swap_cgroup(ent);
+ id = lookup_swap_cgroup_id(ent);
rcu_read_lock();
memcg = mem_cgroup_lookup(id);
if (memcg && !css_tryget(&memcg->css))
@@ -2508,6 +2444,7 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
mem_cgroup_charge_statistics(memcg, PageCgroupCache(pc), nr_pages);
unlock_page_cgroup(pc);
+ WARN_ON_ONCE(PageLRU(page));
/*
* "charge_statistics" updated event counter. Then, check it.
* Insert ancestor (and ancestor's ancestors), to softlimit RB-tree.
@@ -2519,44 +2456,29 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define PCGF_NOCOPY_AT_SPLIT ((1 << PCG_LOCK) | (1 << PCG_MOVE_LOCK) |\
- (1 << PCG_ACCT_LRU) | (1 << PCG_MIGRATION))
+ (1 << PCG_MIGRATION))
/*
* Because tail pages are not marked as "used", set it. We're under
- * zone->lru_lock, 'splitting on pmd' and compund_lock.
+ * zone->lru_lock, 'splitting on pmd' and compound_lock.
+ * charge/uncharge will be never happen and move_account() is done under
+ * compound_lock(), so we don't have to take care of races.
*/
-void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail)
+void mem_cgroup_split_huge_fixup(struct page *head)
{
struct page_cgroup *head_pc = lookup_page_cgroup(head);
- struct page_cgroup *tail_pc = lookup_page_cgroup(tail);
- unsigned long flags;
+ struct page_cgroup *pc;
+ int i;
if (mem_cgroup_disabled())
return;
- /*
- * We have no races with charge/uncharge but will have races with
- * page state accounting.
- */
- move_lock_page_cgroup(head_pc, &flags);
-
- tail_pc->mem_cgroup = head_pc->mem_cgroup;
- smp_wmb(); /* see __commit_charge() */
- if (PageCgroupAcctLRU(head_pc)) {
- enum lru_list lru;
- struct mem_cgroup_per_zone *mz;
-
- /*
- * LRU flags cannot be copied because we need to add tail
- *.page to LRU by generic call and our hook will be called.
- * We hold lru_lock, then, reduce counter directly.
- */
- lru = page_lru(head);
- mz = page_cgroup_zoneinfo(head_pc->mem_cgroup, head);
- MEM_CGROUP_ZSTAT(mz, lru) -= 1;
+ for (i = 1; i < HPAGE_PMD_NR; i++) {
+ pc = head_pc + i;
+ pc->mem_cgroup = head_pc->mem_cgroup;
+ smp_wmb();/* see __commit_charge() */
+ pc->flags = head_pc->flags & ~PCGF_NOCOPY_AT_SPLIT;
}
- tail_pc->flags = head_pc->flags & ~PCGF_NOCOPY_AT_SPLIT;
- move_unlock_page_cgroup(head_pc, &flags);
}
-#endif
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
/**
* mem_cgroup_move_account - move account of the page
@@ -2671,7 +2593,7 @@ static int mem_cgroup_move_parent(struct page *page,
parent = mem_cgroup_from_cont(pcg);
ret = __mem_cgroup_try_charge(NULL, gfp_mask, nr_pages, &parent, false);
- if (ret || !parent)
+ if (ret)
goto put_back;
if (nr_pages > 1)
@@ -2717,12 +2639,9 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
}
pc = lookup_page_cgroup(page);
- BUG_ON(!pc); /* XXX: remove this and move pc lookup into commit */
-
ret = __mem_cgroup_try_charge(mm, gfp_mask, nr_pages, &memcg, oom);
- if (ret || !memcg)
+ if (ret == -ENOMEM)
return ret;
-
__mem_cgroup_commit_charge(memcg, page, nr_pages, pc, ctype);
return 0;
}
@@ -2732,19 +2651,11 @@ int mem_cgroup_newpage_charge(struct page *page,
{
if (mem_cgroup_disabled())
return 0;
- /*
- * If already mapped, we don't have to account.
- * If page cache, page->mapping has address_space.
- * But page->mapping may have out-of-use anon_vma pointer,
- * detecit it by PageAnon() check. newly-mapped-anon's page->mapping
- * is NULL.
- */
- if (page_mapped(page) || (page->mapping && !PageAnon(page)))
- return 0;
- if (unlikely(!mm))
- mm = &init_mm;
+ VM_BUG_ON(page_mapped(page));
+ VM_BUG_ON(page->mapping && !PageAnon(page));
+ VM_BUG_ON(!mm);
return mem_cgroup_charge_common(page, mm, gfp_mask,
- MEM_CGROUP_CHARGE_TYPE_MAPPED);
+ MEM_CGROUP_CHARGE_TYPE_MAPPED);
}
static void
@@ -2756,14 +2667,27 @@ __mem_cgroup_commit_charge_lrucare(struct page *page, struct mem_cgroup *memcg,
enum charge_type ctype)
{
struct page_cgroup *pc = lookup_page_cgroup(page);
+ struct zone *zone = page_zone(page);
+ unsigned long flags;
+ bool removed = false;
+
/*
* In some case, SwapCache, FUSE(splice_buf->radixtree), the page
* is already on LRU. It means the page may on some other page_cgroup's
* LRU. Take care of it.
*/
- mem_cgroup_lru_del_before_commit(page);
+ spin_lock_irqsave(&zone->lru_lock, flags);
+ if (PageLRU(page)) {
+ del_page_from_lru_list(zone, page, page_lru(page));
+ ClearPageLRU(page);
+ removed = true;
+ }
__mem_cgroup_commit_charge(memcg, page, 1, pc, ctype);
- mem_cgroup_lru_add_after_commit(page);
+ if (removed) {
+ add_page_to_lru_list(zone, page, page_lru(page));
+ SetPageLRU(page);
+ }
+ spin_unlock_irqrestore(&zone->lru_lock, flags);
return;
}
@@ -2771,6 +2695,7 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
struct mem_cgroup *memcg = NULL;
+ enum charge_type type = MEM_CGROUP_CHARGE_TYPE_CACHE;
int ret;
if (mem_cgroup_disabled())
@@ -2780,31 +2705,16 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
if (unlikely(!mm))
mm = &init_mm;
+ if (!page_is_file_cache(page))
+ type = MEM_CGROUP_CHARGE_TYPE_SHMEM;
- if (page_is_file_cache(page)) {
- ret = __mem_cgroup_try_charge(mm, gfp_mask, 1, &memcg, true);
- if (ret || !memcg)
- return ret;
-
- /*
- * FUSE reuses pages without going through the final
- * put that would remove them from the LRU list, make
- * sure that they get relinked properly.
- */
- __mem_cgroup_commit_charge_lrucare(page, memcg,
- MEM_CGROUP_CHARGE_TYPE_CACHE);
- return ret;
- }
- /* shmem */
- if (PageSwapCache(page)) {
+ if (!PageSwapCache(page))
+ ret = mem_cgroup_charge_common(page, mm, gfp_mask, type);
+ else { /* page is swapcache/shmem */
ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &memcg);
if (!ret)
- __mem_cgroup_commit_charge_swapin(page, memcg,
- MEM_CGROUP_CHARGE_TYPE_SHMEM);
- } else
- ret = mem_cgroup_charge_common(page, mm, gfp_mask,
- MEM_CGROUP_CHARGE_TYPE_SHMEM);
-
+ __mem_cgroup_commit_charge_swapin(page, memcg, type);
+ }
return ret;
}
@@ -2816,12 +2726,12 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
*/
int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
struct page *page,
- gfp_t mask, struct mem_cgroup **ptr)
+ gfp_t mask, struct mem_cgroup **memcgp)
{
struct mem_cgroup *memcg;
int ret;
- *ptr = NULL;
+ *memcgp = NULL;
if (mem_cgroup_disabled())
return 0;
@@ -2839,27 +2749,32 @@ int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
memcg = try_get_mem_cgroup_from_page(page);
if (!memcg)
goto charge_cur_mm;
- *ptr = memcg;
- ret = __mem_cgroup_try_charge(NULL, mask, 1, ptr, true);
+ *memcgp = memcg;
+ ret = __mem_cgroup_try_charge(NULL, mask, 1, memcgp, true);
css_put(&memcg->css);
+ if (ret == -EINTR)
+ ret = 0;
return ret;
charge_cur_mm:
if (unlikely(!mm))
mm = &init_mm;
- return __mem_cgroup_try_charge(mm, mask, 1, ptr, true);
+ ret = __mem_cgroup_try_charge(mm, mask, 1, memcgp, true);
+ if (ret == -EINTR)
+ ret = 0;
+ return ret;
}
static void
-__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
+__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *memcg,
enum charge_type ctype)
{
if (mem_cgroup_disabled())
return;
- if (!ptr)
+ if (!memcg)
return;
- cgroup_exclude_rmdir(&ptr->css);
+ cgroup_exclude_rmdir(&memcg->css);
- __mem_cgroup_commit_charge_lrucare(page, ptr, ctype);
+ __mem_cgroup_commit_charge_lrucare(page, memcg, ctype);
/*
* Now swap is on-memory. This means this page may be
* counted both as mem and swap....double count.
@@ -2869,21 +2784,22 @@ __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
*/
if (do_swap_account && PageSwapCache(page)) {
swp_entry_t ent = {.val = page_private(page)};
+ struct mem_cgroup *swap_memcg;
unsigned short id;
- struct mem_cgroup *memcg;
id = swap_cgroup_record(ent, 0);
rcu_read_lock();
- memcg = mem_cgroup_lookup(id);
- if (memcg) {
+ swap_memcg = mem_cgroup_lookup(id);
+ if (swap_memcg) {
/*
* This recorded memcg can be obsolete one. So, avoid
* calling css_tryget
*/
- if (!mem_cgroup_is_root(memcg))
- res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
- mem_cgroup_swap_statistics(memcg, false);
- mem_cgroup_put(memcg);
+ if (!mem_cgroup_is_root(swap_memcg))
+ res_counter_uncharge(&swap_memcg->memsw,
+ PAGE_SIZE);
+ mem_cgroup_swap_statistics(swap_memcg, false);
+ mem_cgroup_put(swap_memcg);
}
rcu_read_unlock();
}
@@ -2892,13 +2808,14 @@ __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
* So, rmdir()->pre_destroy() can be called while we do this charge.
* In that case, we need to call pre_destroy() again. check it here.
*/
- cgroup_release_and_wakeup_rmdir(&ptr->css);
+ cgroup_release_and_wakeup_rmdir(&memcg->css);
}
-void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
+void mem_cgroup_commit_charge_swapin(struct page *page,
+ struct mem_cgroup *memcg)
{
- __mem_cgroup_commit_charge_swapin(page, ptr,
- MEM_CGROUP_CHARGE_TYPE_MAPPED);
+ __mem_cgroup_commit_charge_swapin(page, memcg,
+ MEM_CGROUP_CHARGE_TYPE_MAPPED);
}
void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
@@ -2988,7 +2905,7 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
* Check if our page_cgroup is valid
*/
pc = lookup_page_cgroup(page);
- if (unlikely(!pc || !PageCgroupUsed(pc)))
+ if (unlikely(!PageCgroupUsed(pc)))
return NULL;
lock_page_cgroup(pc);
@@ -3051,8 +2968,7 @@ void mem_cgroup_uncharge_page(struct page *page)
/* early check. */
if (page_mapped(page))
return;
- if (page->mapping && !PageAnon(page))
- return;
+ VM_BUG_ON(page->mapping && !PageAnon(page));
__mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_MAPPED);
}
@@ -3110,6 +3026,23 @@ void mem_cgroup_uncharge_end(void)
batch->memcg = NULL;
}
+/*
+ * A function for resetting pc->mem_cgroup for newly allocated pages.
+ * This function should be called if the newpage will be added to LRU
+ * before start accounting.
+ */
+void mem_cgroup_reset_owner(struct page *newpage)
+{
+ struct page_cgroup *pc;
+
+ if (mem_cgroup_disabled())
+ return;
+
+ pc = lookup_page_cgroup(newpage);
+ VM_BUG_ON(PageCgroupUsed(pc));
+ pc->mem_cgroup = root_mem_cgroup;
+}
+
#ifdef CONFIG_SWAP
/*
* called after __delete_from_swap_cache() and drop "page" account.
@@ -3227,14 +3160,14 @@ static inline int mem_cgroup_move_swap_account(swp_entry_t entry,
* page belongs to.
*/
int mem_cgroup_prepare_migration(struct page *page,
- struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask)
+ struct page *newpage, struct mem_cgroup **memcgp, gfp_t gfp_mask)
{
struct mem_cgroup *memcg = NULL;
struct page_cgroup *pc;
enum charge_type ctype;
int ret = 0;
- *ptr = NULL;
+ *memcgp = NULL;
VM_BUG_ON(PageTransHuge(page));
if (mem_cgroup_disabled())
@@ -3285,10 +3218,10 @@ int mem_cgroup_prepare_migration(struct page *page,
if (!memcg)
return 0;
- *ptr = memcg;
- ret = __mem_cgroup_try_charge(NULL, gfp_mask, 1, ptr, false);
+ *memcgp = memcg;
+ ret = __mem_cgroup_try_charge(NULL, gfp_mask, 1, memcgp, false);
css_put(&memcg->css);/* drop extra refcnt */
- if (ret || *ptr == NULL) {
+ if (ret) {
if (PageAnon(page)) {
lock_page_cgroup(pc);
ClearPageCgroupMigration(pc);
@@ -3298,6 +3231,7 @@ int mem_cgroup_prepare_migration(struct page *page,
*/
mem_cgroup_uncharge_page(page);
}
+ /* we'll need to revisit this error code (we have -EINTR) */
return -ENOMEM;
}
/*
@@ -3366,12 +3300,51 @@ void mem_cgroup_end_migration(struct mem_cgroup *memcg,
cgroup_release_and_wakeup_rmdir(&memcg->css);
}
+/*
+ * At replace page cache, newpage is not under any memcg but it's on
+ * LRU. So, this function doesn't touch res_counter but handles LRU
+ * in correct way. Both pages are locked so we cannot race with uncharge.
+ */
+void mem_cgroup_replace_page_cache(struct page *oldpage,
+ struct page *newpage)
+{
+ struct mem_cgroup *memcg;
+ struct page_cgroup *pc;
+ enum charge_type type = MEM_CGROUP_CHARGE_TYPE_CACHE;
+
+ if (mem_cgroup_disabled())
+ return;
+
+ pc = lookup_page_cgroup(oldpage);
+ /* fix accounting on old pages */
+ lock_page_cgroup(pc);
+ memcg = pc->mem_cgroup;
+ mem_cgroup_charge_statistics(memcg, PageCgroupCache(pc), -1);
+ ClearPageCgroupUsed(pc);
+ unlock_page_cgroup(pc);
+
+ if (PageSwapBacked(oldpage))
+ type = MEM_CGROUP_CHARGE_TYPE_SHMEM;
+
+ /*
+ * Even if newpage->mapping was NULL before starting replacement,
+ * the newpage may be on LRU(or pagevec for LRU) already. We lock
+ * LRU while we overwrite pc->mem_cgroup.
+ */
+ __mem_cgroup_commit_charge_lrucare(newpage, memcg, type);
+}
+
#ifdef CONFIG_DEBUG_VM
static struct page_cgroup *lookup_page_cgroup_used(struct page *page)
{
struct page_cgroup *pc;
pc = lookup_page_cgroup(page);
+ /*
+ * Can be NULL while feeding pages into the page allocator for
+ * the first time, i.e. during boot or memory hotplug;
+ * or when mem_cgroup_disabled().
+ */
if (likely(pc) && PageCgroupUsed(pc))
return pc;
return NULL;
@@ -3391,23 +3364,8 @@ void mem_cgroup_print_bad_page(struct page *page)
pc = lookup_page_cgroup_used(page);
if (pc) {
- int ret = -1;
- char *path;
-
- printk(KERN_ALERT "pc:%p pc->flags:%lx pc->mem_cgroup:%p",
+ printk(KERN_ALERT "pc:%p pc->flags:%lx pc->mem_cgroup:%p\n",
pc, pc->flags, pc->mem_cgroup);
-
- path = kmalloc(PATH_MAX, GFP_KERNEL);
- if (path) {
- rcu_read_lock();
- ret = cgroup_path(pc->mem_cgroup->css.cgroup,
- path, PATH_MAX);
- rcu_read_unlock();
- }
-
- printk(KERN_CONT "(%s)\n",
- (ret < 0) ? "cannot get the path" : path);
- kfree(path);
}
}
#endif
@@ -3468,9 +3426,8 @@ static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
if (!ret)
break;
- mem_cgroup_hierarchical_reclaim(memcg, NULL, GFP_KERNEL,
- MEM_CGROUP_RECLAIM_SHRINK,
- NULL);
+ mem_cgroup_reclaim(memcg, GFP_KERNEL,
+ MEM_CGROUP_RECLAIM_SHRINK);
curusage = res_counter_read_u64(&memcg->res, RES_USAGE);
/* Usage is reduced ? */
if (curusage >= oldusage)
@@ -3528,10 +3485,9 @@ static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg,
if (!ret)
break;
- mem_cgroup_hierarchical_reclaim(memcg, NULL, GFP_KERNEL,
- MEM_CGROUP_RECLAIM_NOSWAP |
- MEM_CGROUP_RECLAIM_SHRINK,
- NULL);
+ mem_cgroup_reclaim(memcg, GFP_KERNEL,
+ MEM_CGROUP_RECLAIM_NOSWAP |
+ MEM_CGROUP_RECLAIM_SHRINK);
curusage = res_counter_read_u64(&memcg->memsw, RES_USAGE);
/* Usage is reduced ? */
if (curusage >= oldusage)
@@ -3574,10 +3530,8 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
break;
nr_scanned = 0;
- reclaimed = mem_cgroup_hierarchical_reclaim(mz->mem, zone,
- gfp_mask,
- MEM_CGROUP_RECLAIM_SOFT,
- &nr_scanned);
+ reclaimed = mem_cgroup_soft_reclaim(mz->mem, zone,
+ gfp_mask, &nr_scanned);
nr_reclaimed += reclaimed;
*total_scanned += nr_scanned;
spin_lock(&mctz->lock);
@@ -3645,22 +3599,23 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
int node, int zid, enum lru_list lru)
{
- struct zone *zone;
struct mem_cgroup_per_zone *mz;
- struct page_cgroup *pc, *busy;
unsigned long flags, loop;
struct list_head *list;
+ struct page *busy;
+ struct zone *zone;
int ret = 0;
zone = &NODE_DATA(node)->node_zones[zid];
mz = mem_cgroup_zoneinfo(memcg, node, zid);
- list = &mz->lists[lru];
+ list = &mz->lruvec.lists[lru];
loop = MEM_CGROUP_ZSTAT(mz, lru);
/* give some margin against EBUSY etc...*/
loop += 256;
busy = NULL;
while (loop--) {
+ struct page_cgroup *pc;
struct page *page;
ret = 0;
@@ -3669,24 +3624,24 @@ static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
spin_unlock_irqrestore(&zone->lru_lock, flags);
break;
}
- pc = list_entry(list->prev, struct page_cgroup, lru);
- if (busy == pc) {
- list_move(&pc->lru, list);
+ page = list_entry(list->prev, struct page, lru);
+ if (busy == page) {
+ list_move(&page->lru, list);
busy = NULL;
spin_unlock_irqrestore(&zone->lru_lock, flags);
continue;
}
spin_unlock_irqrestore(&zone->lru_lock, flags);
- page = lookup_cgroup_page(pc);
+ pc = lookup_page_cgroup(page);
ret = mem_cgroup_move_parent(page, pc, memcg, GFP_KERNEL);
- if (ret == -ENOMEM)
+ if (ret == -ENOMEM || ret == -EINTR)
break;
if (ret == -EBUSY || ret == -EINVAL) {
/* found lock contention or "pc" is obsolete. */
- busy = pc;
+ busy = page;
cond_resched();
} else
busy = NULL;
@@ -4612,6 +4567,36 @@ static int mem_control_numa_stat_open(struct inode *unused, struct file *file)
}
#endif /* CONFIG_NUMA */
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
+{
+ /*
+ * Part of this would be better living in a separate allocation
+ * function, leaving us with just the cgroup tree population work.
+ * We, however, depend on state such as network's proto_list that
+ * is only initialized after cgroup creation. I found the less
+ * cumbersome way to deal with it to defer it all to populate time
+ */
+ return mem_cgroup_sockets_init(cont, ss);
+};
+
+static void kmem_cgroup_destroy(struct cgroup_subsys *ss,
+ struct cgroup *cont)
+{
+ mem_cgroup_sockets_destroy(cont, ss);
+}
+#else
+static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
+{
+ return 0;
+}
+
+static void kmem_cgroup_destroy(struct cgroup_subsys *ss,
+ struct cgroup *cont)
+{
+}
+#endif
+
static struct cftype mem_cgroup_files[] = {
{
.name = "usage_in_bytes",
@@ -4750,7 +4735,7 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
for (zone = 0; zone < MAX_NR_ZONES; zone++) {
mz = &pn->zoneinfo[zone];
for_each_lru(l)
- INIT_LIST_HEAD(&mz->lists[l]);
+ INIT_LIST_HEAD(&mz->lruvec.lists[l]);
mz->usage_in_excess = 0;
mz->on_tree = false;
mz->mem = memcg;
@@ -4810,7 +4795,7 @@ static void __mem_cgroup_free(struct mem_cgroup *memcg)
mem_cgroup_remove_from_trees(memcg);
free_css_id(&mem_cgroup_subsys, &memcg->css);
- for_each_node_state(node, N_POSSIBLE)
+ for_each_node(node)
free_mem_cgroup_per_zone_info(memcg, node);
free_percpu(memcg->stat);
@@ -4843,12 +4828,13 @@ static void mem_cgroup_put(struct mem_cgroup *memcg)
/*
* Returns the parent mem_cgroup in memcgroup hierarchy with hierarchy enabled.
*/
-static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
+struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
{
if (!memcg->res.parent)
return NULL;
return mem_cgroup_from_res_counter(memcg->res.parent, res);
}
+EXPORT_SYMBOL(parent_mem_cgroup);
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
static void __init enable_swap_cgroup(void)
@@ -4868,13 +4854,13 @@ static int mem_cgroup_soft_limit_tree_init(void)
struct mem_cgroup_tree_per_zone *rtpz;
int tmp, node, zone;
- for_each_node_state(node, N_POSSIBLE) {
+ for_each_node(node) {
tmp = node;
if (!node_state(node, N_NORMAL_MEMORY))
tmp = -1;
rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp);
if (!rtpn)
- return 1;
+ goto err_cleanup;
soft_limit_tree.rb_tree_per_node[node] = rtpn;
@@ -4885,6 +4871,16 @@ static int mem_cgroup_soft_limit_tree_init(void)
}
}
return 0;
+
+err_cleanup:
+ for_each_node(node) {
+ if (!soft_limit_tree.rb_tree_per_node[node])
+ break;
+ kfree(soft_limit_tree.rb_tree_per_node[node]);
+ soft_limit_tree.rb_tree_per_node[node] = NULL;
+ }
+ return 1;
+
}
static struct cgroup_subsys_state * __ref
@@ -4898,7 +4894,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
if (!memcg)
return ERR_PTR(error);
- for_each_node_state(node, N_POSSIBLE)
+ for_each_node(node)
if (alloc_mem_cgroup_per_zone_info(memcg, node))
goto free_out;
@@ -4907,9 +4903,9 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
int cpu;
enable_swap_cgroup();
parent = NULL;
- root_mem_cgroup = memcg;
if (mem_cgroup_soft_limit_tree_init())
goto free_out;
+ root_mem_cgroup = memcg;
for_each_possible_cpu(cpu) {
struct memcg_stock_pcp *stock =
&per_cpu(memcg_stock, cpu);
@@ -4936,7 +4932,6 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
res_counter_init(&memcg->res, NULL);
res_counter_init(&memcg->memsw, NULL);
}
- memcg->last_scanned_child = 0;
memcg->last_scanned_node = MAX_NUMNODES;
INIT_LIST_HEAD(&memcg->oom_notify);
@@ -4948,7 +4943,6 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
return &memcg->css;
free_out:
__mem_cgroup_free(memcg);
- root_mem_cgroup = NULL;
return ERR_PTR(error);
}
@@ -4965,6 +4959,8 @@ static void mem_cgroup_destroy(struct cgroup_subsys *ss,
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
+ kmem_cgroup_destroy(ss, cont);
+
mem_cgroup_put(memcg);
}
@@ -4978,6 +4974,10 @@ static int mem_cgroup_populate(struct cgroup_subsys *ss,
if (!ret)
ret = register_memsw_files(cont, ss);
+
+ if (!ret)
+ ret = register_kmem_files(cont, ss);
+
return ret;
}
@@ -5027,9 +5027,9 @@ one_by_one:
}
ret = __mem_cgroup_try_charge(NULL,
GFP_KERNEL, 1, &memcg, false);
- if (ret || !memcg)
+ if (ret)
/* mem_cgroup_clear_mc() will do uncharge later */
- return -ENOMEM;
+ return ret;
mc.precharge++;
}
return ret;
@@ -5174,7 +5174,7 @@ static int is_target_pte_for_mc(struct vm_area_struct *vma,
}
/* There is a swap entry and a page doesn't exist or isn't charged */
if (ent.val && !ret &&
- css_id(&mc.from->css) == lookup_swap_cgroup(ent)) {
+ css_id(&mc.from->css) == lookup_swap_cgroup_id(ent)) {
ret = MC_TARGET_SWAP;
if (target)
target->ent = ent;
@@ -5298,8 +5298,9 @@ static void mem_cgroup_clear_mc(void)
static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
struct cgroup *cgroup,
- struct task_struct *p)
+ struct cgroup_taskset *tset)
{
+ struct task_struct *p = cgroup_taskset_first(tset);
int ret = 0;
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgroup);
@@ -5337,7 +5338,7 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss,
struct cgroup *cgroup,
- struct task_struct *p)
+ struct cgroup_taskset *tset)
{
mem_cgroup_clear_mc();
}
@@ -5454,9 +5455,9 @@ retry:
static void mem_cgroup_move_task(struct cgroup_subsys *ss,
struct cgroup *cont,
- struct cgroup *old_cont,
- struct task_struct *p)
+ struct cgroup_taskset *tset)
{
+ struct task_struct *p = cgroup_taskset_first(tset);
struct mm_struct *mm = get_task_mm(p);
if (mm) {
@@ -5471,19 +5472,18 @@ static void mem_cgroup_move_task(struct cgroup_subsys *ss,
#else /* !CONFIG_MMU */
static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
struct cgroup *cgroup,
- struct task_struct *p)
+ struct cgroup_taskset *tset)
{
return 0;
}
static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss,
struct cgroup *cgroup,
- struct task_struct *p)
+ struct cgroup_taskset *tset)
{
}
static void mem_cgroup_move_task(struct cgroup_subsys *ss,
struct cgroup *cont,
- struct cgroup *old_cont,
- struct task_struct *p)
+ struct cgroup_taskset *tset)
{
}
#endif
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 06d3479513aa..56080ea36140 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1557,7 +1557,7 @@ int soft_offline_page(struct page *page, int flags)
page_is_file_cache(page));
list_add(&page->lru, &pagelist);
ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL,
- 0, true);
+ 0, MIGRATE_SYNC);
if (ret) {
putback_lru_pages(&pagelist);
pr_info("soft offline: %#lx: migration failed %d, type %lx\n",
diff --git a/mm/memory.c b/mm/memory.c
index 829d43735402..5e30583c2605 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -293,7 +293,7 @@ int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
struct mmu_gather_batch *batch;
- tlb->need_flush = 1;
+ VM_BUG_ON(!tlb->need_flush);
if (tlb_fast_mode(tlb)) {
free_page_and_swap_cache(page);
@@ -1231,7 +1231,7 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
if (next-addr != HPAGE_PMD_SIZE) {
VM_BUG_ON(!rwsem_is_locked(&tlb->mm->mmap_sem));
split_huge_page_pmd(vma->vm_mm, pmd);
- } else if (zap_huge_pmd(tlb, vma, pmd))
+ } else if (zap_huge_pmd(tlb, vma, pmd, addr))
continue;
/* fall through */
}
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 2168489c0bc9..6629fafd6ce4 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -809,7 +809,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
}
/* this function returns # of failed pages */
ret = migrate_pages(&source, hotremove_migrate_alloc, 0,
- true, true);
+ true, MIGRATE_SYNC);
if (ret)
putback_lru_pages(&source);
}
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index adc395481813..06b145fb64ab 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -636,6 +636,7 @@ static int mbind_range(struct mm_struct *mm, unsigned long start,
struct vm_area_struct *prev;
struct vm_area_struct *vma;
int err = 0;
+ pgoff_t pgoff;
unsigned long vmstart;
unsigned long vmend;
@@ -643,13 +644,21 @@ static int mbind_range(struct mm_struct *mm, unsigned long start,
if (!vma || vma->vm_start > start)
return -EFAULT;
+ if (start > vma->vm_start)
+ prev = vma;
+
for (; vma && vma->vm_start < end; prev = vma, vma = next) {
next = vma->vm_next;
vmstart = max(start, vma->vm_start);
vmend = min(end, vma->vm_end);
+ if (mpol_equal(vma_policy(vma), new_pol))
+ continue;
+
+ pgoff = vma->vm_pgoff +
+ ((vmstart - vma->vm_start) >> PAGE_SHIFT);
prev = vma_merge(mm, prev, vmstart, vmend, vma->vm_flags,
- vma->anon_vma, vma->vm_file, vma->vm_pgoff,
+ vma->anon_vma, vma->vm_file, pgoff,
new_pol);
if (prev) {
vma = prev;
@@ -933,7 +942,7 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, new_node_page, dest,
- false, true);
+ false, MIGRATE_SYNC);
if (err)
putback_lru_pages(&pagelist);
}
@@ -1974,28 +1983,28 @@ struct mempolicy *__mpol_cond_copy(struct mempolicy *tompol,
}
/* Slow path of a mempolicy comparison */
-int __mpol_equal(struct mempolicy *a, struct mempolicy *b)
+bool __mpol_equal(struct mempolicy *a, struct mempolicy *b)
{
if (!a || !b)
- return 0;
+ return false;
if (a->mode != b->mode)
- return 0;
+ return false;
if (a->flags != b->flags)
- return 0;
+ return false;
if (mpol_store_user_nodemask(a))
if (!nodes_equal(a->w.user_nodemask, b->w.user_nodemask))
- return 0;
+ return false;
switch (a->mode) {
case MPOL_BIND:
/* Fall through */
case MPOL_INTERLEAVE:
- return nodes_equal(a->v.nodes, b->v.nodes);
+ return !!nodes_equal(a->v.nodes, b->v.nodes);
case MPOL_PREFERRED:
return a->v.preferred_node == b->v.preferred_node;
default:
BUG();
- return 0;
+ return false;
}
}
diff --git a/mm/mempool.c b/mm/mempool.c
index e73641b79bb5..d9049811f352 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -27,7 +27,15 @@ static void *remove_element(mempool_t *pool)
return pool->elements[--pool->curr_nr];
}
-static void free_pool(mempool_t *pool)
+/**
+ * mempool_destroy - deallocate a memory pool
+ * @pool: pointer to the memory pool which was allocated via
+ * mempool_create().
+ *
+ * Free all reserved elements in @pool and @pool itself. This function
+ * only sleeps if the free_fn() function sleeps.
+ */
+void mempool_destroy(mempool_t *pool)
{
while (pool->curr_nr) {
void *element = remove_element(pool);
@@ -36,6 +44,7 @@ static void free_pool(mempool_t *pool)
kfree(pool->elements);
kfree(pool);
}
+EXPORT_SYMBOL(mempool_destroy);
/**
* mempool_create - create a memory pool
@@ -86,7 +95,7 @@ mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
element = pool->alloc(GFP_KERNEL, pool->pool_data);
if (unlikely(!element)) {
- free_pool(pool);
+ mempool_destroy(pool);
return NULL;
}
add_element(pool, element);
@@ -172,23 +181,6 @@ out:
EXPORT_SYMBOL(mempool_resize);
/**
- * mempool_destroy - deallocate a memory pool
- * @pool: pointer to the memory pool which was allocated via
- * mempool_create().
- *
- * this function only sleeps if the free_fn() function sleeps. The caller
- * has to guarantee that all elements have been returned to the pool (ie:
- * freed) prior to calling mempool_destroy().
- */
-void mempool_destroy(mempool_t *pool)
-{
- /* Check for outstanding elements */
- BUG_ON(pool->curr_nr != pool->min_nr);
- free_pool(pool);
-}
-EXPORT_SYMBOL(mempool_destroy);
-
-/**
* mempool_alloc - allocate an element from a specific memory pool
* @pool: pointer to the memory pool which was allocated via
* mempool_create().
@@ -224,28 +216,40 @@ repeat_alloc:
if (likely(pool->curr_nr)) {
element = remove_element(pool);
spin_unlock_irqrestore(&pool->lock, flags);
+ /* paired with rmb in mempool_free(), read comment there */
+ smp_wmb();
return element;
}
- spin_unlock_irqrestore(&pool->lock, flags);
- /* We must not sleep in the GFP_ATOMIC case */
- if (!(gfp_mask & __GFP_WAIT))
+ /*
+ * We use gfp mask w/o __GFP_WAIT or IO for the first round. If
+ * alloc failed with that and @pool was empty, retry immediately.
+ */
+ if (gfp_temp != gfp_mask) {
+ spin_unlock_irqrestore(&pool->lock, flags);
+ gfp_temp = gfp_mask;
+ goto repeat_alloc;
+ }
+
+ /* We must not sleep if !__GFP_WAIT */
+ if (!(gfp_mask & __GFP_WAIT)) {
+ spin_unlock_irqrestore(&pool->lock, flags);
return NULL;
+ }
- /* Now start performing page reclaim */
- gfp_temp = gfp_mask;
+ /* Let's wait for someone else to return an element to @pool */
init_wait(&wait);
prepare_to_wait(&pool->wait, &wait, TASK_UNINTERRUPTIBLE);
- smp_mb();
- if (!pool->curr_nr) {
- /*
- * FIXME: this should be io_schedule(). The timeout is there
- * as a workaround for some DM problems in 2.6.18.
- */
- io_schedule_timeout(5*HZ);
- }
- finish_wait(&pool->wait, &wait);
+ spin_unlock_irqrestore(&pool->lock, flags);
+
+ /*
+ * FIXME: this should be io_schedule(). The timeout is there as a
+ * workaround for some DM problems in 2.6.18.
+ */
+ io_schedule_timeout(5*HZ);
+
+ finish_wait(&pool->wait, &wait);
goto repeat_alloc;
}
EXPORT_SYMBOL(mempool_alloc);
@@ -265,7 +269,39 @@ void mempool_free(void *element, mempool_t *pool)
if (unlikely(element == NULL))
return;
- smp_mb();
+ /*
+ * Paired with the wmb in mempool_alloc(). The preceding read is
+ * for @element and the following @pool->curr_nr. This ensures
+ * that the visible value of @pool->curr_nr is from after the
+ * allocation of @element. This is necessary for fringe cases
+ * where @element was passed to this task without going through
+ * barriers.
+ *
+ * For example, assume @p is %NULL at the beginning and one task
+ * performs "p = mempool_alloc(...);" while another task is doing
+ * "while (!p) cpu_relax(); mempool_free(p, ...);". This function
+ * may end up using curr_nr value which is from before allocation
+ * of @p without the following rmb.
+ */
+ smp_rmb();
+
+ /*
+ * For correctness, we need a test which is guaranteed to trigger
+ * if curr_nr + #allocated == min_nr. Testing curr_nr < min_nr
+ * without locking achieves that and refilling as soon as possible
+ * is desirable.
+ *
+ * Because curr_nr visible here is always a value after the
+ * allocation of @element, any task which decremented curr_nr below
+ * min_nr is guaranteed to see curr_nr < min_nr unless curr_nr gets
+ * incremented to min_nr afterwards. If curr_nr gets incremented
+ * to min_nr after the allocation of @element, the elements
+ * allocated after that are subject to the same guarantee.
+ *
+ * Waiters happen iff curr_nr is 0 and the above guarantee also
+ * ensures that there will be frees which return elements to the
+ * pool waking up the waiters.
+ */
if (pool->curr_nr < pool->min_nr) {
spin_lock_irqsave(&pool->lock, flags);
if (pool->curr_nr < pool->min_nr) {
diff --git a/mm/migrate.c b/mm/migrate.c
index 177aca424a06..9871a56d82c3 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -39,8 +39,6 @@
#include "internal.h"
-#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
-
/*
* migrate_prep() needs to be called before we start compiling a list of pages
* to be migrated using isolate_lru_page(). If scheduling work on other CPUs is
@@ -181,8 +179,6 @@ static void remove_migration_ptes(struct page *old, struct page *new)
* Something used the pte of a page under migration. We need to
* get to the page and wait until migration is finished.
* When we return from this function the fault will be retried.
- *
- * This function is called from do_swap_page().
*/
void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
unsigned long address)
@@ -220,6 +216,56 @@ out:
pte_unmap_unlock(ptep, ptl);
}
+#ifdef CONFIG_BLOCK
+/* Returns true if all buffers are successfully locked */
+static bool buffer_migrate_lock_buffers(struct buffer_head *head,
+ enum migrate_mode mode)
+{
+ struct buffer_head *bh = head;
+
+ /* Simple case, sync compaction */
+ if (mode != MIGRATE_ASYNC) {
+ do {
+ get_bh(bh);
+ lock_buffer(bh);
+ bh = bh->b_this_page;
+
+ } while (bh != head);
+
+ return true;
+ }
+
+ /* async case, we cannot block on lock_buffer so use trylock_buffer */
+ do {
+ get_bh(bh);
+ if (!trylock_buffer(bh)) {
+ /*
+ * We failed to lock the buffer and cannot stall in
+ * async migration. Release the taken locks
+ */
+ struct buffer_head *failed_bh = bh;
+ put_bh(failed_bh);
+ bh = head;
+ while (bh != failed_bh) {
+ unlock_buffer(bh);
+ put_bh(bh);
+ bh = bh->b_this_page;
+ }
+ return false;
+ }
+
+ bh = bh->b_this_page;
+ } while (bh != head);
+ return true;
+}
+#else
+static inline bool buffer_migrate_lock_buffers(struct buffer_head *head,
+ enum migrate_mode mode)
+{
+ return true;
+}
+#endif /* CONFIG_BLOCK */
+
/*
* Replace the page in the mapping.
*
@@ -229,7 +275,8 @@ out:
* 3 for pages with a mapping and PagePrivate/PagePrivate2 set.
*/
static int migrate_page_move_mapping(struct address_space *mapping,
- struct page *newpage, struct page *page)
+ struct page *newpage, struct page *page,
+ struct buffer_head *head, enum migrate_mode mode)
{
int expected_count;
void **pslot;
@@ -259,6 +306,20 @@ static int migrate_page_move_mapping(struct address_space *mapping,
}
/*
+ * In the async migration case of moving a page with buffers, lock the
+ * buffers using trylock before the mapping is moved. If the mapping
+ * was moved, we later failed to lock the buffers and could not move
+ * the mapping back due to an elevated page count, we would have to
+ * block waiting on other references to be dropped.
+ */
+ if (mode == MIGRATE_ASYNC && head &&
+ !buffer_migrate_lock_buffers(head, mode)) {
+ page_unfreeze_refs(page, expected_count);
+ spin_unlock_irq(&mapping->tree_lock);
+ return -EAGAIN;
+ }
+
+ /*
* Now we know that no one else is looking at the page.
*/
get_page(newpage); /* add cache reference */
@@ -269,12 +330,12 @@ static int migrate_page_move_mapping(struct address_space *mapping,
radix_tree_replace_slot(pslot, newpage);
- page_unfreeze_refs(page, expected_count);
/*
- * Drop cache reference from old page.
+ * Drop cache reference from old page by unfreezing
+ * to one less reference.
* We know this isn't the last reference.
*/
- __put_page(page);
+ page_unfreeze_refs(page, expected_count - 1);
/*
* If moved to a different zone then also account
@@ -334,9 +395,7 @@ int migrate_huge_page_move_mapping(struct address_space *mapping,
radix_tree_replace_slot(pslot, newpage);
- page_unfreeze_refs(page, expected_count);
-
- __put_page(page);
+ page_unfreeze_refs(page, expected_count - 1);
spin_unlock_irq(&mapping->tree_lock);
return 0;
@@ -415,13 +474,14 @@ EXPORT_SYMBOL(fail_migrate_page);
* Pages are locked upon entry and exit.
*/
int migrate_page(struct address_space *mapping,
- struct page *newpage, struct page *page)
+ struct page *newpage, struct page *page,
+ enum migrate_mode mode)
{
int rc;
BUG_ON(PageWriteback(page)); /* Writeback must be complete */
- rc = migrate_page_move_mapping(mapping, newpage, page);
+ rc = migrate_page_move_mapping(mapping, newpage, page, NULL, mode);
if (rc)
return rc;
@@ -438,28 +498,28 @@ EXPORT_SYMBOL(migrate_page);
* exist.
*/
int buffer_migrate_page(struct address_space *mapping,
- struct page *newpage, struct page *page)
+ struct page *newpage, struct page *page, enum migrate_mode mode)
{
struct buffer_head *bh, *head;
int rc;
if (!page_has_buffers(page))
- return migrate_page(mapping, newpage, page);
+ return migrate_page(mapping, newpage, page, mode);
head = page_buffers(page);
- rc = migrate_page_move_mapping(mapping, newpage, page);
+ rc = migrate_page_move_mapping(mapping, newpage, page, head, mode);
if (rc)
return rc;
- bh = head;
- do {
- get_bh(bh);
- lock_buffer(bh);
- bh = bh->b_this_page;
-
- } while (bh != head);
+ /*
+ * In the async case, migrate_page_move_mapping locked the buffers
+ * with an IRQ-safe spinlock held. In the sync case, the buffers
+ * need to be locked now
+ */
+ if (mode != MIGRATE_ASYNC)
+ BUG_ON(!buffer_migrate_lock_buffers(head, mode));
ClearPagePrivate(page);
set_page_private(newpage, page_private(page));
@@ -536,10 +596,14 @@ static int writeout(struct address_space *mapping, struct page *page)
* Default handling if a filesystem does not provide a migration function.
*/
static int fallback_migrate_page(struct address_space *mapping,
- struct page *newpage, struct page *page)
+ struct page *newpage, struct page *page, enum migrate_mode mode)
{
- if (PageDirty(page))
+ if (PageDirty(page)) {
+ /* Only writeback pages in full synchronous migration */
+ if (mode != MIGRATE_SYNC)
+ return -EBUSY;
return writeout(mapping, page);
+ }
/*
* Buffers may be managed in a filesystem specific way.
@@ -549,7 +613,7 @@ static int fallback_migrate_page(struct address_space *mapping,
!try_to_release_page(page, GFP_KERNEL))
return -EAGAIN;
- return migrate_page(mapping, newpage, page);
+ return migrate_page(mapping, newpage, page, mode);
}
/*
@@ -564,7 +628,7 @@ static int fallback_migrate_page(struct address_space *mapping,
* == 0 - success
*/
static int move_to_new_page(struct page *newpage, struct page *page,
- int remap_swapcache, bool sync)
+ int remap_swapcache, enum migrate_mode mode)
{
struct address_space *mapping;
int rc;
@@ -585,29 +649,18 @@ static int move_to_new_page(struct page *newpage, struct page *page,
mapping = page_mapping(page);
if (!mapping)
- rc = migrate_page(mapping, newpage, page);
- else {
+ rc = migrate_page(mapping, newpage, page, mode);
+ else if (mapping->a_ops->migratepage)
/*
- * Do not writeback pages if !sync and migratepage is
- * not pointing to migrate_page() which is nonblocking
- * (swapcache/tmpfs uses migratepage = migrate_page).
+ * Most pages have a mapping and most filesystems provide a
+ * migratepage callback. Anonymous pages are part of swap
+ * space which also has its own migratepage callback. This
+ * is the most common path for page migration.
*/
- if (PageDirty(page) && !sync &&
- mapping->a_ops->migratepage != migrate_page)
- rc = -EBUSY;
- else if (mapping->a_ops->migratepage)
- /*
- * Most pages have a mapping and most filesystems
- * should provide a migration function. Anonymous
- * pages are part of swap space which also has its
- * own migration function. This is the most common
- * path for page migration.
- */
- rc = mapping->a_ops->migratepage(mapping,
- newpage, page);
- else
- rc = fallback_migrate_page(mapping, newpage, page);
- }
+ rc = mapping->a_ops->migratepage(mapping,
+ newpage, page, mode);
+ else
+ rc = fallback_migrate_page(mapping, newpage, page, mode);
if (rc) {
newpage->mapping = NULL;
@@ -622,7 +675,7 @@ static int move_to_new_page(struct page *newpage, struct page *page,
}
static int __unmap_and_move(struct page *page, struct page *newpage,
- int force, bool offlining, bool sync)
+ int force, bool offlining, enum migrate_mode mode)
{
int rc = -EAGAIN;
int remap_swapcache = 1;
@@ -631,7 +684,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
struct anon_vma *anon_vma = NULL;
if (!trylock_page(page)) {
- if (!force || !sync)
+ if (!force || mode == MIGRATE_ASYNC)
goto out;
/*
@@ -677,10 +730,12 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
if (PageWriteback(page)) {
/*
- * For !sync, there is no point retrying as the retry loop
- * is expected to be too short for PageWriteback to be cleared
+ * Only in the case of a full syncronous migration is it
+ * necessary to wait for PageWriteback. In the async case,
+ * the retry loop is too short and in the sync-light case,
+ * the overhead of stalling is too much
*/
- if (!sync) {
+ if (mode != MIGRATE_SYNC) {
rc = -EBUSY;
goto uncharge;
}
@@ -751,7 +806,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
skip_unmap:
if (!page_mapped(page))
- rc = move_to_new_page(newpage, page, remap_swapcache, sync);
+ rc = move_to_new_page(newpage, page, remap_swapcache, mode);
if (rc && remap_swapcache)
remove_migration_ptes(page, page);
@@ -774,7 +829,8 @@ out:
* to the newly allocated page in newpage.
*/
static int unmap_and_move(new_page_t get_new_page, unsigned long private,
- struct page *page, int force, bool offlining, bool sync)
+ struct page *page, int force, bool offlining,
+ enum migrate_mode mode)
{
int rc = 0;
int *result = NULL;
@@ -783,6 +839,8 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
if (!newpage)
return -ENOMEM;
+ mem_cgroup_reset_owner(newpage);
+
if (page_count(page) == 1) {
/* page was freed from under us. So we are done. */
goto out;
@@ -792,7 +850,7 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
if (unlikely(split_huge_page(page)))
goto out;
- rc = __unmap_and_move(page, newpage, force, offlining, sync);
+ rc = __unmap_and_move(page, newpage, force, offlining, mode);
out:
if (rc != -EAGAIN) {
/*
@@ -840,7 +898,8 @@ out:
*/
static int unmap_and_move_huge_page(new_page_t get_new_page,
unsigned long private, struct page *hpage,
- int force, bool offlining, bool sync)
+ int force, bool offlining,
+ enum migrate_mode mode)
{
int rc = 0;
int *result = NULL;
@@ -853,7 +912,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
rc = -EAGAIN;
if (!trylock_page(hpage)) {
- if (!force || !sync)
+ if (!force || mode != MIGRATE_SYNC)
goto out;
lock_page(hpage);
}
@@ -864,7 +923,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
try_to_unmap(hpage, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
if (!page_mapped(hpage))
- rc = move_to_new_page(new_hpage, hpage, 1, sync);
+ rc = move_to_new_page(new_hpage, hpage, 1, mode);
if (rc)
remove_migration_ptes(hpage, hpage);
@@ -907,7 +966,7 @@ out:
*/
int migrate_pages(struct list_head *from,
new_page_t get_new_page, unsigned long private, bool offlining,
- bool sync)
+ enum migrate_mode mode)
{
int retry = 1;
int nr_failed = 0;
@@ -928,7 +987,7 @@ int migrate_pages(struct list_head *from,
rc = unmap_and_move(get_new_page, private,
page, pass > 2, offlining,
- sync);
+ mode);
switch(rc) {
case -ENOMEM:
@@ -958,7 +1017,7 @@ out:
int migrate_huge_pages(struct list_head *from,
new_page_t get_new_page, unsigned long private, bool offlining,
- bool sync)
+ enum migrate_mode mode)
{
int retry = 1;
int nr_failed = 0;
@@ -975,7 +1034,7 @@ int migrate_huge_pages(struct list_head *from,
rc = unmap_and_move_huge_page(get_new_page,
private, page, pass > 2, offlining,
- sync);
+ mode);
switch(rc) {
case -ENOMEM:
@@ -1104,7 +1163,7 @@ set_status:
err = 0;
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, new_page_node,
- (unsigned long)pm, 0, true);
+ (unsigned long)pm, 0, MIGRATE_SYNC);
if (err)
putback_lru_pages(&pagelist);
}
diff --git a/mm/mmap.c b/mm/mmap.c
index eae90af60ea6..3f758c7f4c81 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1603,39 +1603,19 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
EXPORT_SYMBOL(find_vma);
-/* Same as find_vma, but also return a pointer to the previous VMA in *pprev. */
+/*
+ * Same as find_vma, but also return a pointer to the previous VMA in *pprev.
+ * Note: pprev is set to NULL when return value is NULL.
+ */
struct vm_area_struct *
find_vma_prev(struct mm_struct *mm, unsigned long addr,
struct vm_area_struct **pprev)
{
- struct vm_area_struct *vma = NULL, *prev = NULL;
- struct rb_node *rb_node;
- if (!mm)
- goto out;
-
- /* Guard against addr being lower than the first VMA */
- vma = mm->mmap;
-
- /* Go through the RB tree quickly. */
- rb_node = mm->mm_rb.rb_node;
-
- while (rb_node) {
- struct vm_area_struct *vma_tmp;
- vma_tmp = rb_entry(rb_node, struct vm_area_struct, vm_rb);
-
- if (addr < vma_tmp->vm_end) {
- rb_node = rb_node->rb_left;
- } else {
- prev = vma_tmp;
- if (!prev->vm_next || (addr < prev->vm_next->vm_end))
- break;
- rb_node = rb_node->rb_right;
- }
- }
+ struct vm_area_struct *vma;
-out:
- *pprev = prev;
- return prev ? prev->vm_next : vma;
+ vma = find_vma(mm, addr);
+ *pprev = vma ? vma->vm_prev : NULL;
+ return vma;
}
/*
@@ -2322,13 +2302,16 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
struct vm_area_struct *new_vma, *prev;
struct rb_node **rb_link, *rb_parent;
struct mempolicy *pol;
+ bool faulted_in_anon_vma = true;
/*
* If anonymous vma has not yet been faulted, update new pgoff
* to match new location, to increase its chance of merging.
*/
- if (!vma->vm_file && !vma->anon_vma)
+ if (unlikely(!vma->vm_file && !vma->anon_vma)) {
pgoff = addr >> PAGE_SHIFT;
+ faulted_in_anon_vma = false;
+ }
find_vma_prepare(mm, addr, &prev, &rb_link, &rb_parent);
new_vma = vma_merge(mm, prev, addr, addr + len, vma->vm_flags,
@@ -2337,9 +2320,24 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
/*
* Source vma may have been merged into new_vma
*/
- if (vma_start >= new_vma->vm_start &&
- vma_start < new_vma->vm_end)
+ if (unlikely(vma_start >= new_vma->vm_start &&
+ vma_start < new_vma->vm_end)) {
+ /*
+ * The only way we can get a vma_merge with
+ * self during an mremap is if the vma hasn't
+ * been faulted in yet and we were allowed to
+ * reset the dst vma->vm_pgoff to the
+ * destination address of the mremap to allow
+ * the merge to happen. mremap must change the
+ * vm_pgoff linearity between src and dst vmas
+ * (in turn preventing a vma_merge) to be
+ * safe. It is only safe to keep the vm_pgoff
+ * linear if there are no pages mapped yet.
+ */
+ VM_BUG_ON(faulted_in_anon_vma);
*vmap = new_vma;
+ } else
+ anon_vma_moveto_tail(new_vma);
} else {
new_vma = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
if (new_vma) {
diff --git a/mm/mremap.c b/mm/mremap.c
index d6959cb4df58..87bb8393e7d2 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -221,6 +221,15 @@ static unsigned long move_vma(struct vm_area_struct *vma,
moved_len = move_page_tables(vma, old_addr, new_vma, new_addr, old_len);
if (moved_len < old_len) {
/*
+ * Before moving the page tables from the new vma to
+ * the old vma, we need to be sure the old vma is
+ * queued after new vma in the same_anon_vma list to
+ * prevent SMP races with rmap_walk (that could lead
+ * rmap_walk to miss some page table).
+ */
+ anon_vma_moveto_tail(vma);
+
+ /*
* On error, move entries back from new area to old,
* which will succeed since page tables still there,
* and then proceed to unmap new area instead of old.
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index 7fa41b4a07bf..24f0fc1a56d6 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -41,14 +41,13 @@ static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
if (limit > memblock.current_limit)
limit = memblock.current_limit;
- addr = find_memory_core_early(nid, size, align, goal, limit);
-
- if (addr == MEMBLOCK_ERROR)
+ addr = memblock_find_in_range_node(goal, limit, size, align, nid);
+ if (!addr)
return NULL;
ptr = phys_to_virt(addr);
memset(ptr, 0, size);
- memblock_x86_reserve_range(addr, addr + size, "BOOTMEM");
+ memblock_reserve(addr, size);
/*
* The min_count is set to 0 so that bootmem allocated blocks
* are never reported as leaks.
@@ -107,23 +106,27 @@ static void __init __free_pages_memory(unsigned long start, unsigned long end)
__free_pages_bootmem(pfn_to_page(i), 0);
}
-unsigned long __init free_all_memory_core_early(int nodeid)
+unsigned long __init free_low_memory_core_early(int nodeid)
{
- int i;
- u64 start, end;
unsigned long count = 0;
- struct range *range = NULL;
- int nr_range;
-
- nr_range = get_free_all_memory_range(&range, nodeid);
-
- for (i = 0; i < nr_range; i++) {
- start = range[i].start;
- end = range[i].end;
- count += end - start;
- __free_pages_memory(start, end);
+ phys_addr_t start, end;
+ u64 i;
+
+ /* free reserved array temporarily so that it's treated as free area */
+ memblock_free_reserved_regions();
+
+ for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) {
+ unsigned long start_pfn = PFN_UP(start);
+ unsigned long end_pfn = min_t(unsigned long,
+ PFN_DOWN(end), max_low_pfn);
+ if (start_pfn < end_pfn) {
+ __free_pages_memory(start_pfn, end_pfn);
+ count += end_pfn - start_pfn;
+ }
}
+ /* put region array back? */
+ memblock_reserve_reserved_regions();
return count;
}
@@ -137,7 +140,7 @@ unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
{
register_page_bootmem_info_node(pgdat);
- /* free_all_memory_core_early(MAX_NUMNODES) will be called later */
+ /* free_low_memory_core_early(MAX_NUMNODES) will be called later */
return 0;
}
@@ -155,7 +158,7 @@ unsigned long __init free_all_bootmem(void)
* Use MAX_NUMNODES will make sure all ranges in early_node_map[]
* will be used instead of only Node0 related
*/
- return free_all_memory_core_early(MAX_NUMNODES);
+ return free_low_memory_core_early(MAX_NUMNODES);
}
/**
@@ -172,7 +175,7 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
unsigned long size)
{
kmemleak_free_part(__va(physaddr), size);
- memblock_x86_free_range(physaddr, physaddr + size);
+ memblock_free(physaddr, size);
}
/**
@@ -187,7 +190,7 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
void __init free_bootmem(unsigned long addr, unsigned long size)
{
kmemleak_free_part(__va(addr), size);
- memblock_x86_free_range(addr, addr + size);
+ memblock_free(addr, size);
}
static void * __init ___alloc_bootmem_nopanic(unsigned long size,
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 76f2c5ae908e..2958fd8e7c9a 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -33,6 +33,10 @@
#include <linux/security.h>
#include <linux/ptrace.h>
#include <linux/freezer.h>
+#include <linux/ftrace.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/oom.h>
int sysctl_panic_on_oom;
int sysctl_oom_kill_allocating_task;
@@ -55,6 +59,7 @@ void compare_swap_oom_score_adj(int old_val, int new_val)
spin_lock_irq(&sighand->siglock);
if (current->signal->oom_score_adj == old_val)
current->signal->oom_score_adj = new_val;
+ trace_oom_score_adj_update(current);
spin_unlock_irq(&sighand->siglock);
}
@@ -74,6 +79,7 @@ int test_set_oom_score_adj(int new_val)
spin_lock_irq(&sighand->siglock);
old_val = current->signal->oom_score_adj;
current->signal->oom_score_adj = new_val;
+ trace_oom_score_adj_update(current);
spin_unlock_irq(&sighand->siglock);
return old_val;
@@ -146,7 +152,7 @@ struct task_struct *find_lock_task_mm(struct task_struct *p)
/* return true if the task is not adequate as candidate victim task. */
static bool oom_unkillable_task(struct task_struct *p,
- const struct mem_cgroup *mem, const nodemask_t *nodemask)
+ const struct mem_cgroup *memcg, const nodemask_t *nodemask)
{
if (is_global_init(p))
return true;
@@ -154,7 +160,7 @@ static bool oom_unkillable_task(struct task_struct *p,
return true;
/* When mem_cgroup_out_of_memory() and p is not member of the group */
- if (mem && !task_in_mem_cgroup(p, mem))
+ if (memcg && !task_in_mem_cgroup(p, memcg))
return true;
/* p may not have freeable memory in nodemask */
@@ -173,12 +179,12 @@ static bool oom_unkillable_task(struct task_struct *p,
* predictable as possible. The goal is to return the highest value for the
* task consuming the most memory to avoid subsequent oom failures.
*/
-unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
+unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
const nodemask_t *nodemask, unsigned long totalpages)
{
- int points;
+ long points;
- if (oom_unkillable_task(p, mem, nodemask))
+ if (oom_unkillable_task(p, memcg, nodemask))
return 0;
p = find_lock_task_mm(p);
@@ -302,7 +308,7 @@ static enum oom_constraint constrained_alloc(struct zonelist *zonelist,
* (not docbooked, we don't want this one cluttering up the manual)
*/
static struct task_struct *select_bad_process(unsigned int *ppoints,
- unsigned long totalpages, struct mem_cgroup *mem,
+ unsigned long totalpages, struct mem_cgroup *memcg,
const nodemask_t *nodemask)
{
struct task_struct *g, *p;
@@ -314,7 +320,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
if (p->exit_state)
continue;
- if (oom_unkillable_task(p, mem, nodemask))
+ if (oom_unkillable_task(p, memcg, nodemask))
continue;
/*
@@ -328,7 +334,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
*/
if (test_tsk_thread_flag(p, TIF_MEMDIE)) {
if (unlikely(frozen(p)))
- thaw_process(p);
+ __thaw_task(p);
return ERR_PTR(-1UL);
}
if (!p->mm)
@@ -358,7 +364,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
}
}
- points = oom_badness(p, mem, nodemask, totalpages);
+ points = oom_badness(p, memcg, nodemask, totalpages);
if (points > *ppoints) {
chosen = p;
*ppoints = points;
@@ -381,14 +387,14 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
*
* Call with tasklist_lock read-locked.
*/
-static void dump_tasks(const struct mem_cgroup *mem, const nodemask_t *nodemask)
+static void dump_tasks(const struct mem_cgroup *memcg, const nodemask_t *nodemask)
{
struct task_struct *p;
struct task_struct *task;
pr_info("[ pid ] uid tgid total_vm rss cpu oom_adj oom_score_adj name\n");
for_each_process(p) {
- if (oom_unkillable_task(p, mem, nodemask))
+ if (oom_unkillable_task(p, memcg, nodemask))
continue;
task = find_lock_task_mm(p);
@@ -411,7 +417,7 @@ static void dump_tasks(const struct mem_cgroup *mem, const nodemask_t *nodemask)
}
static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
- struct mem_cgroup *mem, const nodemask_t *nodemask)
+ struct mem_cgroup *memcg, const nodemask_t *nodemask)
{
task_lock(current);
pr_warning("%s invoked oom-killer: gfp_mask=0x%x, order=%d, "
@@ -421,14 +427,14 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
cpuset_print_task_mems_allowed(current);
task_unlock(current);
dump_stack();
- mem_cgroup_print_oom_info(mem, p);
+ mem_cgroup_print_oom_info(memcg, p);
show_mem(SHOW_MEM_FILTER_NODES);
if (sysctl_oom_dump_tasks)
- dump_tasks(mem, nodemask);
+ dump_tasks(memcg, nodemask);
}
#define K(x) ((x) << (PAGE_SHIFT-10))
-static int oom_kill_task(struct task_struct *p, struct mem_cgroup *mem)
+static int oom_kill_task(struct task_struct *p)
{
struct task_struct *q;
struct mm_struct *mm;
@@ -478,7 +484,7 @@ static int oom_kill_task(struct task_struct *p, struct mem_cgroup *mem)
static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
unsigned int points, unsigned long totalpages,
- struct mem_cgroup *mem, nodemask_t *nodemask,
+ struct mem_cgroup *memcg, nodemask_t *nodemask,
const char *message)
{
struct task_struct *victim = p;
@@ -487,7 +493,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
unsigned int victim_points = 0;
if (printk_ratelimit())
- dump_header(p, gfp_mask, order, mem, nodemask);
+ dump_header(p, gfp_mask, order, memcg, nodemask);
/*
* If the task is already exiting, don't alarm the sysadmin or kill
@@ -518,7 +524,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
/*
* oom_badness() returns 0 if the thread is unkillable
*/
- child_points = oom_badness(child, mem, nodemask,
+ child_points = oom_badness(child, memcg, nodemask,
totalpages);
if (child_points > victim_points) {
victim = child;
@@ -527,7 +533,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
}
} while_each_thread(p, t);
- return oom_kill_task(victim, mem);
+ return oom_kill_task(victim);
}
/*
@@ -555,7 +561,7 @@ static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
}
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
+void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask)
{
unsigned long limit;
unsigned int points = 0;
@@ -572,14 +578,14 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
}
check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, 0, NULL);
- limit = mem_cgroup_get_limit(mem) >> PAGE_SHIFT;
+ limit = mem_cgroup_get_limit(memcg) >> PAGE_SHIFT;
read_lock(&tasklist_lock);
retry:
- p = select_bad_process(&points, limit, mem, NULL);
+ p = select_bad_process(&points, limit, memcg, NULL);
if (!p || PTR_ERR(p) == -1UL)
goto out;
- if (oom_kill_process(p, gfp_mask, 0, points, limit, mem, NULL,
+ if (oom_kill_process(p, gfp_mask, 0, points, limit, memcg, NULL,
"Memory cgroup out of memory"))
goto retry;
out:
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 71252486bc6f..363ba7082ef5 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -32,7 +32,7 @@
#include <linux/sysctl.h>
#include <linux/cpu.h>
#include <linux/syscalls.h>
-#include <linux/buffer_head.h>
+#include <linux/buffer_head.h> /* __set_page_dirty_buffers */
#include <linux/pagevec.h>
#include <trace/events/writeback.h>
@@ -42,6 +42,12 @@
#define MAX_PAUSE max(HZ/5, 1)
/*
+ * Try to keep balance_dirty_pages() call intervals higher than this many pages
+ * by raising pause time to max_pause when falls below it.
+ */
+#define DIRTY_POLL_THRESH (128 >> (PAGE_SHIFT - 10))
+
+/*
* Estimate write bandwidth at 200ms intervals.
*/
#define BANDWIDTH_INTERVAL max(HZ/5, 1)
@@ -130,6 +136,191 @@ unsigned long global_dirty_limit;
static struct prop_descriptor vm_completions;
/*
+ * Work out the current dirty-memory clamping and background writeout
+ * thresholds.
+ *
+ * The main aim here is to lower them aggressively if there is a lot of mapped
+ * memory around. To avoid stressing page reclaim with lots of unreclaimable
+ * pages. It is better to clamp down on writers than to start swapping, and
+ * performing lots of scanning.
+ *
+ * We only allow 1/2 of the currently-unmapped memory to be dirtied.
+ *
+ * We don't permit the clamping level to fall below 5% - that is getting rather
+ * excessive.
+ *
+ * We make sure that the background writeout level is below the adjusted
+ * clamping level.
+ */
+
+/*
+ * In a memory zone, there is a certain amount of pages we consider
+ * available for the page cache, which is essentially the number of
+ * free and reclaimable pages, minus some zone reserves to protect
+ * lowmem and the ability to uphold the zone's watermarks without
+ * requiring writeback.
+ *
+ * This number of dirtyable pages is the base value of which the
+ * user-configurable dirty ratio is the effictive number of pages that
+ * are allowed to be actually dirtied. Per individual zone, or
+ * globally by using the sum of dirtyable pages over all zones.
+ *
+ * Because the user is allowed to specify the dirty limit globally as
+ * absolute number of bytes, calculating the per-zone dirty limit can
+ * require translating the configured limit into a percentage of
+ * global dirtyable memory first.
+ */
+
+static unsigned long highmem_dirtyable_memory(unsigned long total)
+{
+#ifdef CONFIG_HIGHMEM
+ int node;
+ unsigned long x = 0;
+
+ for_each_node_state(node, N_HIGH_MEMORY) {
+ struct zone *z =
+ &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
+
+ x += zone_page_state(z, NR_FREE_PAGES) +
+ zone_reclaimable_pages(z) - z->dirty_balance_reserve;
+ }
+ /*
+ * Make sure that the number of highmem pages is never larger
+ * than the number of the total dirtyable memory. This can only
+ * occur in very strange VM situations but we want to make sure
+ * that this does not occur.
+ */
+ return min(x, total);
+#else
+ return 0;
+#endif
+}
+
+/**
+ * global_dirtyable_memory - number of globally dirtyable pages
+ *
+ * Returns the global number of pages potentially available for dirty
+ * page cache. This is the base value for the global dirty limits.
+ */
+unsigned long global_dirtyable_memory(void)
+{
+ unsigned long x;
+
+ x = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages() -
+ dirty_balance_reserve;
+
+ if (!vm_highmem_is_dirtyable)
+ x -= highmem_dirtyable_memory(x);
+
+ return x + 1; /* Ensure that we never return 0 */
+}
+
+/*
+ * global_dirty_limits - background-writeback and dirty-throttling thresholds
+ *
+ * Calculate the dirty thresholds based on sysctl parameters
+ * - vm.dirty_background_ratio or vm.dirty_background_bytes
+ * - vm.dirty_ratio or vm.dirty_bytes
+ * The dirty limits will be lifted by 1/4 for PF_LESS_THROTTLE (ie. nfsd) and
+ * real-time tasks.
+ */
+void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty)
+{
+ unsigned long background;
+ unsigned long dirty;
+ unsigned long uninitialized_var(available_memory);
+ struct task_struct *tsk;
+
+ if (!vm_dirty_bytes || !dirty_background_bytes)
+ available_memory = global_dirtyable_memory();
+
+ if (vm_dirty_bytes)
+ dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE);
+ else
+ dirty = (vm_dirty_ratio * available_memory) / 100;
+
+ if (dirty_background_bytes)
+ background = DIV_ROUND_UP(dirty_background_bytes, PAGE_SIZE);
+ else
+ background = (dirty_background_ratio * available_memory) / 100;
+
+ if (background >= dirty)
+ background = dirty / 2;
+ tsk = current;
+ if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk)) {
+ background += background / 4;
+ dirty += dirty / 4;
+ }
+ *pbackground = background;
+ *pdirty = dirty;
+ trace_global_dirty_state(background, dirty);
+}
+
+/**
+ * zone_dirtyable_memory - number of dirtyable pages in a zone
+ * @zone: the zone
+ *
+ * Returns the zone's number of pages potentially available for dirty
+ * page cache. This is the base value for the per-zone dirty limits.
+ */
+static unsigned long zone_dirtyable_memory(struct zone *zone)
+{
+ /*
+ * The effective global number of dirtyable pages may exclude
+ * highmem as a big-picture measure to keep the ratio between
+ * dirty memory and lowmem reasonable.
+ *
+ * But this function is purely about the individual zone and a
+ * highmem zone can hold its share of dirty pages, so we don't
+ * care about vm_highmem_is_dirtyable here.
+ */
+ return zone_page_state(zone, NR_FREE_PAGES) +
+ zone_reclaimable_pages(zone) -
+ zone->dirty_balance_reserve;
+}
+
+/**
+ * zone_dirty_limit - maximum number of dirty pages allowed in a zone
+ * @zone: the zone
+ *
+ * Returns the maximum number of dirty pages allowed in a zone, based
+ * on the zone's dirtyable memory.
+ */
+static unsigned long zone_dirty_limit(struct zone *zone)
+{
+ unsigned long zone_memory = zone_dirtyable_memory(zone);
+ struct task_struct *tsk = current;
+ unsigned long dirty;
+
+ if (vm_dirty_bytes)
+ dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE) *
+ zone_memory / global_dirtyable_memory();
+ else
+ dirty = vm_dirty_ratio * zone_memory / 100;
+
+ if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk))
+ dirty += dirty / 4;
+
+ return dirty;
+}
+
+/**
+ * zone_dirty_ok - tells whether a zone is within its dirty limits
+ * @zone: the zone to check
+ *
+ * Returns %true when the dirty pages in @zone are within the zone's
+ * dirty limit, %false if the limit is exceeded.
+ */
+bool zone_dirty_ok(struct zone *zone)
+{
+ unsigned long limit = zone_dirty_limit(zone);
+
+ return zone_page_state(zone, NR_FILE_DIRTY) +
+ zone_page_state(zone, NR_UNSTABLE_NFS) +
+ zone_page_state(zone, NR_WRITEBACK) <= limit;
+}
+
+/*
* couple the period to the dirty_ratio:
*
* period/2 ~ roundup_pow_of_two(dirty limit)
@@ -141,7 +332,7 @@ static int calc_period_shift(void)
if (vm_dirty_bytes)
dirty_total = vm_dirty_bytes / PAGE_SIZE;
else
- dirty_total = (vm_dirty_ratio * determine_dirtyable_memory()) /
+ dirty_total = (vm_dirty_ratio * global_dirtyable_memory()) /
100;
return 2 + ilog2(dirty_total - 1);
}
@@ -196,7 +387,6 @@ int dirty_ratio_handler(struct ctl_table *table, int write,
return ret;
}
-
int dirty_bytes_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
@@ -291,67 +481,6 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned max_ratio)
}
EXPORT_SYMBOL(bdi_set_max_ratio);
-/*
- * Work out the current dirty-memory clamping and background writeout
- * thresholds.
- *
- * The main aim here is to lower them aggressively if there is a lot of mapped
- * memory around. To avoid stressing page reclaim with lots of unreclaimable
- * pages. It is better to clamp down on writers than to start swapping, and
- * performing lots of scanning.
- *
- * We only allow 1/2 of the currently-unmapped memory to be dirtied.
- *
- * We don't permit the clamping level to fall below 5% - that is getting rather
- * excessive.
- *
- * We make sure that the background writeout level is below the adjusted
- * clamping level.
- */
-
-static unsigned long highmem_dirtyable_memory(unsigned long total)
-{
-#ifdef CONFIG_HIGHMEM
- int node;
- unsigned long x = 0;
-
- for_each_node_state(node, N_HIGH_MEMORY) {
- struct zone *z =
- &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
-
- x += zone_page_state(z, NR_FREE_PAGES) +
- zone_reclaimable_pages(z);
- }
- /*
- * Make sure that the number of highmem pages is never larger
- * than the number of the total dirtyable memory. This can only
- * occur in very strange VM situations but we want to make sure
- * that this does not occur.
- */
- return min(x, total);
-#else
- return 0;
-#endif
-}
-
-/**
- * determine_dirtyable_memory - amount of memory that may be used
- *
- * Returns the numebr of pages that can currently be freed and used
- * by the kernel for direct mappings.
- */
-unsigned long determine_dirtyable_memory(void)
-{
- unsigned long x;
-
- x = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages();
-
- if (!vm_highmem_is_dirtyable)
- x -= highmem_dirtyable_memory(x);
-
- return x + 1; /* Ensure that we never return 0 */
-}
-
static unsigned long dirty_freerun_ceiling(unsigned long thresh,
unsigned long bg_thresh)
{
@@ -363,47 +492,6 @@ static unsigned long hard_dirty_limit(unsigned long thresh)
return max(thresh, global_dirty_limit);
}
-/*
- * global_dirty_limits - background-writeback and dirty-throttling thresholds
- *
- * Calculate the dirty thresholds based on sysctl parameters
- * - vm.dirty_background_ratio or vm.dirty_background_bytes
- * - vm.dirty_ratio or vm.dirty_bytes
- * The dirty limits will be lifted by 1/4 for PF_LESS_THROTTLE (ie. nfsd) and
- * real-time tasks.
- */
-void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty)
-{
- unsigned long background;
- unsigned long dirty;
- unsigned long uninitialized_var(available_memory);
- struct task_struct *tsk;
-
- if (!vm_dirty_bytes || !dirty_background_bytes)
- available_memory = determine_dirtyable_memory();
-
- if (vm_dirty_bytes)
- dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE);
- else
- dirty = (vm_dirty_ratio * available_memory) / 100;
-
- if (dirty_background_bytes)
- background = DIV_ROUND_UP(dirty_background_bytes, PAGE_SIZE);
- else
- background = (dirty_background_ratio * available_memory) / 100;
-
- if (background >= dirty)
- background = dirty / 2;
- tsk = current;
- if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk)) {
- background += background / 4;
- dirty += dirty / 4;
- }
- *pbackground = background;
- *pdirty = dirty;
- trace_global_dirty_state(background, dirty);
-}
-
/**
* bdi_dirty_limit - @bdi's share of dirty throttling threshold
* @bdi: the backing_dev_info to query
@@ -411,8 +499,13 @@ void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty)
*
* Returns @bdi's dirty limit in pages. The term "dirty" in the context of
* dirty balancing includes all PG_dirty, PG_writeback and NFS unstable pages.
- * And the "limit" in the name is not seriously taken as hard limit in
- * balance_dirty_pages().
+ *
+ * Note that balance_dirty_pages() will only seriously take it as a hard limit
+ * when sleeping max_pause per page is not enough to keep the dirty pages under
+ * control. For example, when the device is completely stalled due to some error
+ * conditions, or when there are 1000 dd tasks writing to a slow 10MB/s USB key.
+ * In the other normal situations, it acts more gently by throttling the tasks
+ * more (rather than completely block them) when the bdi dirty pages go high.
*
* It allocates high/low dirty limits to fast/slow devices, in order to prevent
* - starving fast devices
@@ -594,6 +687,13 @@ static unsigned long bdi_position_ratio(struct backing_dev_info *bdi,
*/
if (unlikely(bdi_thresh > thresh))
bdi_thresh = thresh;
+ /*
+ * It's very possible that bdi_thresh is close to 0 not because the
+ * device is slow, but that it has remained inactive for long time.
+ * Honour such devices a reasonable good (hopefully IO efficient)
+ * threshold, so that the occasional writes won't be blocked and active
+ * writes can rampup the threshold quickly.
+ */
bdi_thresh = max(bdi_thresh, (limit - dirty) / 8);
/*
* scale global setpoint to bdi's:
@@ -804,6 +904,11 @@ static void bdi_update_dirty_ratelimit(struct backing_dev_info *bdi,
*/
balanced_dirty_ratelimit = div_u64((u64)task_ratelimit * write_bw,
dirty_rate | 1);
+ /*
+ * balanced_dirty_ratelimit ~= (write_bw / N) <= write_bw
+ */
+ if (unlikely(balanced_dirty_ratelimit > write_bw))
+ balanced_dirty_ratelimit = write_bw;
/*
* We could safely do this and return immediately:
@@ -950,41 +1055,98 @@ static unsigned long dirty_poll_interval(unsigned long dirty,
return 1;
}
-static unsigned long bdi_max_pause(struct backing_dev_info *bdi,
- unsigned long bdi_dirty)
+static long bdi_max_pause(struct backing_dev_info *bdi,
+ unsigned long bdi_dirty)
{
- unsigned long bw = bdi->avg_write_bandwidth;
- unsigned long hi = ilog2(bw);
- unsigned long lo = ilog2(bdi->dirty_ratelimit);
- unsigned long t;
+ long bw = bdi->avg_write_bandwidth;
+ long t;
- /* target for 20ms max pause on 1-dd case */
- t = HZ / 50;
+ /*
+ * Limit pause time for small memory systems. If sleeping for too long
+ * time, a small pool of dirty/writeback pages may go empty and disk go
+ * idle.
+ *
+ * 8 serves as the safety ratio.
+ */
+ t = bdi_dirty / (1 + bw / roundup_pow_of_two(1 + HZ / 8));
+ t++;
+
+ return min_t(long, t, MAX_PAUSE);
+}
+
+static long bdi_min_pause(struct backing_dev_info *bdi,
+ long max_pause,
+ unsigned long task_ratelimit,
+ unsigned long dirty_ratelimit,
+ int *nr_dirtied_pause)
+{
+ long hi = ilog2(bdi->avg_write_bandwidth);
+ long lo = ilog2(bdi->dirty_ratelimit);
+ long t; /* target pause */
+ long pause; /* estimated next pause */
+ int pages; /* target nr_dirtied_pause */
+
+ /* target for 10ms pause on 1-dd case */
+ t = max(1, HZ / 100);
/*
* Scale up pause time for concurrent dirtiers in order to reduce CPU
* overheads.
*
- * (N * 20ms) on 2^N concurrent tasks.
+ * (N * 10ms) on 2^N concurrent tasks.
*/
if (hi > lo)
- t += (hi - lo) * (20 * HZ) / 1024;
+ t += (hi - lo) * (10 * HZ) / 1024;
/*
- * Limit pause time for small memory systems. If sleeping for too long
- * time, a small pool of dirty/writeback pages may go empty and disk go
- * idle.
+ * This is a bit convoluted. We try to base the next nr_dirtied_pause
+ * on the much more stable dirty_ratelimit. However the next pause time
+ * will be computed based on task_ratelimit and the two rate limits may
+ * depart considerably at some time. Especially if task_ratelimit goes
+ * below dirty_ratelimit/2 and the target pause is max_pause, the next
+ * pause time will be max_pause*2 _trimmed down_ to max_pause. As a
+ * result task_ratelimit won't be executed faithfully, which could
+ * eventually bring down dirty_ratelimit.
*
- * 8 serves as the safety ratio.
+ * We apply two rules to fix it up:
+ * 1) try to estimate the next pause time and if necessary, use a lower
+ * nr_dirtied_pause so as not to exceed max_pause. When this happens,
+ * nr_dirtied_pause will be "dancing" with task_ratelimit.
+ * 2) limit the target pause time to max_pause/2, so that the normal
+ * small fluctuations of task_ratelimit won't trigger rule (1) and
+ * nr_dirtied_pause will remain as stable as dirty_ratelimit.
*/
- if (bdi_dirty)
- t = min(t, bdi_dirty * HZ / (8 * bw + 1));
+ t = min(t, 1 + max_pause / 2);
+ pages = dirty_ratelimit * t / roundup_pow_of_two(HZ);
/*
- * The pause time will be settled within range (max_pause/4, max_pause).
- * Apply a minimal value of 4 to get a non-zero max_pause/4.
+ * Tiny nr_dirtied_pause is found to hurt I/O performance in the test
+ * case fio-mmap-randwrite-64k, which does 16*{sync read, async write}.
+ * When the 16 consecutive reads are often interrupted by some dirty
+ * throttling pause during the async writes, cfq will go into idles
+ * (deadline is fine). So push nr_dirtied_pause as high as possible
+ * until reaches DIRTY_POLL_THRESH=32 pages.
*/
- return clamp_val(t, 4, MAX_PAUSE);
+ if (pages < DIRTY_POLL_THRESH) {
+ t = max_pause;
+ pages = dirty_ratelimit * t / roundup_pow_of_two(HZ);
+ if (pages > DIRTY_POLL_THRESH) {
+ pages = DIRTY_POLL_THRESH;
+ t = HZ * DIRTY_POLL_THRESH / dirty_ratelimit;
+ }
+ }
+
+ pause = HZ * pages / (task_ratelimit + 1);
+ if (pause > max_pause) {
+ t = max_pause;
+ pages = task_ratelimit * t / roundup_pow_of_two(HZ);
+ }
+
+ *nr_dirtied_pause = pages;
+ /*
+ * The minimal pause time will normally be half the target pause time.
+ */
+ return pages >= DIRTY_POLL_THRESH ? 1 + t / 2 : t;
}
/*
@@ -1005,16 +1167,21 @@ static void balance_dirty_pages(struct address_space *mapping,
unsigned long background_thresh;
unsigned long dirty_thresh;
unsigned long bdi_thresh;
- long pause = 0;
- long uninitialized_var(max_pause);
+ long period;
+ long pause;
+ long max_pause;
+ long min_pause;
+ int nr_dirtied_pause;
bool dirty_exceeded = false;
unsigned long task_ratelimit;
- unsigned long uninitialized_var(dirty_ratelimit);
+ unsigned long dirty_ratelimit;
unsigned long pos_ratio;
struct backing_dev_info *bdi = mapping->backing_dev_info;
unsigned long start_time = jiffies;
for (;;) {
+ unsigned long now = jiffies;
+
/*
* Unstable writes are a feature of certain networked
* filesystems (i.e. NFS) in which data may have been
@@ -1034,8 +1201,13 @@ static void balance_dirty_pages(struct address_space *mapping,
*/
freerun = dirty_freerun_ceiling(dirty_thresh,
background_thresh);
- if (nr_dirty <= freerun)
+ if (nr_dirty <= freerun) {
+ current->dirty_paused_when = now;
+ current->nr_dirtied = 0;
+ current->nr_dirtied_pause =
+ dirty_poll_interval(nr_dirty, dirty_thresh);
break;
+ }
if (unlikely(!writeback_in_progress(bdi)))
bdi_start_background_writeback(bdi);
@@ -1075,7 +1247,7 @@ static void balance_dirty_pages(struct address_space *mapping,
bdi_stat(bdi, BDI_WRITEBACK);
}
- dirty_exceeded = (bdi_dirty > bdi_thresh) ||
+ dirty_exceeded = (bdi_dirty > bdi_thresh) &&
(nr_dirty > dirty_thresh);
if (dirty_exceeded && !bdi->dirty_exceeded)
bdi->dirty_exceeded = 1;
@@ -1084,20 +1256,34 @@ static void balance_dirty_pages(struct address_space *mapping,
nr_dirty, bdi_thresh, bdi_dirty,
start_time);
- max_pause = bdi_max_pause(bdi, bdi_dirty);
-
dirty_ratelimit = bdi->dirty_ratelimit;
pos_ratio = bdi_position_ratio(bdi, dirty_thresh,
background_thresh, nr_dirty,
bdi_thresh, bdi_dirty);
task_ratelimit = ((u64)dirty_ratelimit * pos_ratio) >>
RATELIMIT_CALC_SHIFT;
+ max_pause = bdi_max_pause(bdi, bdi_dirty);
+ min_pause = bdi_min_pause(bdi, max_pause,
+ task_ratelimit, dirty_ratelimit,
+ &nr_dirtied_pause);
+
if (unlikely(task_ratelimit == 0)) {
+ period = max_pause;
pause = max_pause;
goto pause;
}
- pause = HZ * pages_dirtied / task_ratelimit;
- if (unlikely(pause <= 0)) {
+ period = HZ * pages_dirtied / task_ratelimit;
+ pause = period;
+ if (current->dirty_paused_when)
+ pause -= now - current->dirty_paused_when;
+ /*
+ * For less than 1s think time (ext3/4 may block the dirtier
+ * for up to 800ms from time to time on 1-HDD; so does xfs,
+ * however at much less frequency), try to compensate it in
+ * future periods by updating the virtual time; otherwise just
+ * do a reset, as it may be a light dirtier.
+ */
+ if (pause < min_pause) {
trace_balance_dirty_pages(bdi,
dirty_thresh,
background_thresh,
@@ -1107,12 +1293,24 @@ static void balance_dirty_pages(struct address_space *mapping,
dirty_ratelimit,
task_ratelimit,
pages_dirtied,
- pause,
+ period,
+ min(pause, 0L),
start_time);
- pause = 1; /* avoid resetting nr_dirtied_pause below */
+ if (pause < -HZ) {
+ current->dirty_paused_when = now;
+ current->nr_dirtied = 0;
+ } else if (period) {
+ current->dirty_paused_when += period;
+ current->nr_dirtied = 0;
+ } else if (current->nr_dirtied_pause <= pages_dirtied)
+ current->nr_dirtied_pause += pages_dirtied;
break;
}
- pause = min(pause, max_pause);
+ if (unlikely(pause > max_pause)) {
+ /* for occasional dropped task_ratelimit */
+ now += min(pause - max_pause, max_pause);
+ pause = max_pause;
+ }
pause:
trace_balance_dirty_pages(bdi,
@@ -1124,11 +1322,16 @@ pause:
dirty_ratelimit,
task_ratelimit,
pages_dirtied,
+ period,
pause,
start_time);
__set_current_state(TASK_KILLABLE);
io_schedule_timeout(pause);
+ current->dirty_paused_when = now + pause;
+ current->nr_dirtied = 0;
+ current->nr_dirtied_pause = nr_dirtied_pause;
+
/*
* This is typically equal to (nr_dirty < dirty_thresh) and can
* also keep "1000+ dd on a slow USB stick" under control.
@@ -1136,6 +1339,19 @@ pause:
if (task_ratelimit)
break;
+ /*
+ * In the case of an unresponding NFS server and the NFS dirty
+ * pages exceeds dirty_thresh, give the other good bdi's a pipe
+ * to go through, so that tasks on them still remain responsive.
+ *
+ * In theory 1 page is enough to keep the comsumer-producer
+ * pipe going: the flusher cleans 1 page => the task dirties 1
+ * more page. However bdi_dirty has accounting errors. So use
+ * the larger and more IO friendly bdi_stat_error.
+ */
+ if (bdi_dirty <= bdi_stat_error(bdi))
+ break;
+
if (fatal_signal_pending(current))
break;
}
@@ -1143,23 +1359,6 @@ pause:
if (!dirty_exceeded && bdi->dirty_exceeded)
bdi->dirty_exceeded = 0;
- current->nr_dirtied = 0;
- if (pause == 0) { /* in freerun area */
- current->nr_dirtied_pause =
- dirty_poll_interval(nr_dirty, dirty_thresh);
- } else if (pause <= max_pause / 4 &&
- pages_dirtied >= current->nr_dirtied_pause) {
- current->nr_dirtied_pause = clamp_val(
- dirty_ratelimit * (max_pause / 2) / HZ,
- pages_dirtied + pages_dirtied / 8,
- pages_dirtied * 4);
- } else if (pause >= max_pause) {
- current->nr_dirtied_pause = 1 | clamp_val(
- dirty_ratelimit * (max_pause / 2) / HZ,
- pages_dirtied / 4,
- pages_dirtied - pages_dirtied / 8);
- }
-
if (writeback_in_progress(bdi))
return;
@@ -1190,6 +1389,22 @@ void set_page_dirty_balance(struct page *page, int page_mkwrite)
static DEFINE_PER_CPU(int, bdp_ratelimits);
+/*
+ * Normal tasks are throttled by
+ * loop {
+ * dirty tsk->nr_dirtied_pause pages;
+ * take a snap in balance_dirty_pages();
+ * }
+ * However there is a worst case. If every task exit immediately when dirtied
+ * (tsk->nr_dirtied_pause - 1) pages, balance_dirty_pages() will never be
+ * called to throttle the page dirties. The solution is to save the not yet
+ * throttled page dirties in dirty_throttle_leaks on task exit and charge them
+ * randomly into the running tasks. This works well for the above worst case,
+ * as the new task will pick up and accumulate the old task's leaked dirty
+ * count and eventually get throttled.
+ */
+DEFINE_PER_CPU(int, dirty_throttle_leaks) = 0;
+
/**
* balance_dirty_pages_ratelimited_nr - balance dirty memory state
* @mapping: address_space which was dirtied
@@ -1218,8 +1433,6 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
if (bdi->dirty_exceeded)
ratelimit = min(ratelimit, 32 >> (PAGE_SHIFT - 10));
- current->nr_dirtied += nr_pages_dirtied;
-
preempt_disable();
/*
* This prevents one CPU to accumulate too many dirtied pages without
@@ -1230,12 +1443,20 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
p = &__get_cpu_var(bdp_ratelimits);
if (unlikely(current->nr_dirtied >= ratelimit))
*p = 0;
- else {
- *p += nr_pages_dirtied;
- if (unlikely(*p >= ratelimit_pages)) {
- *p = 0;
- ratelimit = 0;
- }
+ else if (unlikely(*p >= ratelimit_pages)) {
+ *p = 0;
+ ratelimit = 0;
+ }
+ /*
+ * Pick up the dirtied pages by the exited tasks. This avoids lots of
+ * short-lived tasks (eg. gcc invocations in a kernel build) escaping
+ * the dirty throttling and livelock other long-run dirtiers.
+ */
+ p = &__get_cpu_var(dirty_throttle_leaks);
+ if (*p > 0 && current->nr_dirtied < ratelimit) {
+ nr_pages_dirtied = min(*p, ratelimit - current->nr_dirtied);
+ *p -= nr_pages_dirtied;
+ current->nr_dirtied += nr_pages_dirtied;
}
preempt_enable();
@@ -1717,6 +1938,8 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
__inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
__inc_bdi_stat(mapping->backing_dev_info, BDI_DIRTIED);
task_io_account_write(PAGE_CACHE_SIZE);
+ current->nr_dirtied++;
+ this_cpu_inc(bdp_ratelimits);
}
}
EXPORT_SYMBOL(account_page_dirtied);
@@ -1777,6 +2000,24 @@ int __set_page_dirty_nobuffers(struct page *page)
EXPORT_SYMBOL(__set_page_dirty_nobuffers);
/*
+ * Call this whenever redirtying a page, to de-account the dirty counters
+ * (NR_DIRTIED, BDI_DIRTIED, tsk->nr_dirtied), so that they match the written
+ * counters (NR_WRITTEN, BDI_WRITTEN) in long term. The mismatches will lead to
+ * systematic errors in balanced_dirty_ratelimit and the dirty pages position
+ * control.
+ */
+void account_page_redirty(struct page *page)
+{
+ struct address_space *mapping = page->mapping;
+ if (mapping && mapping_cap_account_dirty(mapping)) {
+ current->nr_dirtied--;
+ dec_zone_page_state(page, NR_DIRTIED);
+ dec_bdi_stat(mapping->backing_dev_info, BDI_DIRTIED);
+ }
+}
+EXPORT_SYMBOL(account_page_redirty);
+
+/*
* When a writepage implementation decides that it doesn't want to write this
* page for some reason, it should redirty the locked page via
* redirty_page_for_writepage() and it should then unlock the page and return 0
@@ -1784,6 +2025,7 @@ EXPORT_SYMBOL(__set_page_dirty_nobuffers);
int redirty_page_for_writepage(struct writeback_control *wbc, struct page *page)
{
wbc->pages_skipped++;
+ account_page_redirty(page);
return __set_page_dirty_nobuffers(page);
}
EXPORT_SYMBOL(redirty_page_for_writepage);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2b8ba3aebf6e..0027d8f4a1bb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -57,6 +57,7 @@
#include <linux/ftrace_event.h>
#include <linux/memcontrol.h>
#include <linux/prefetch.h>
+#include <linux/page-debug-flags.h>
#include <asm/tlbflush.h>
#include <asm/div64.h>
@@ -96,6 +97,14 @@ EXPORT_SYMBOL(node_states);
unsigned long totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
+/*
+ * When calculating the number of globally allowed dirty pages, there
+ * is a certain number of per-zone reserves that should not be
+ * considered dirtyable memory. This is the sum of those reserves
+ * over all existing zones that contribute dirtyable memory.
+ */
+unsigned long dirty_balance_reserve __read_mostly;
+
int percpu_pagelist_fraction;
gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
@@ -127,6 +136,13 @@ void pm_restrict_gfp_mask(void)
saved_gfp_mask = gfp_allowed_mask;
gfp_allowed_mask &= ~GFP_IOFS;
}
+
+bool pm_suspended_storage(void)
+{
+ if ((gfp_allowed_mask & GFP_IOFS) == GFP_IOFS)
+ return false;
+ return true;
+}
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
@@ -181,39 +197,17 @@ static unsigned long __meminitdata nr_kernel_pages;
static unsigned long __meminitdata nr_all_pages;
static unsigned long __meminitdata dma_reserve;
-#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
- /*
- * MAX_ACTIVE_REGIONS determines the maximum number of distinct
- * ranges of memory (RAM) that may be registered with add_active_range().
- * Ranges passed to add_active_range() will be merged if possible
- * so the number of times add_active_range() can be called is
- * related to the number of nodes and the number of holes
- */
- #ifdef CONFIG_MAX_ACTIVE_REGIONS
- /* Allow an architecture to set MAX_ACTIVE_REGIONS to save memory */
- #define MAX_ACTIVE_REGIONS CONFIG_MAX_ACTIVE_REGIONS
- #else
- #if MAX_NUMNODES >= 32
- /* If there can be many nodes, allow up to 50 holes per node */
- #define MAX_ACTIVE_REGIONS (MAX_NUMNODES*50)
- #else
- /* By default, allow up to 256 distinct regions */
- #define MAX_ACTIVE_REGIONS 256
- #endif
- #endif
-
- static struct node_active_region __meminitdata early_node_map[MAX_ACTIVE_REGIONS];
- static int __meminitdata nr_nodemap_entries;
- static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
- static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
- static unsigned long __initdata required_kernelcore;
- static unsigned long __initdata required_movablecore;
- static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES];
-
- /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
- int movable_zone;
- EXPORT_SYMBOL(movable_zone);
-#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
+static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
+static unsigned long __initdata required_kernelcore;
+static unsigned long __initdata required_movablecore;
+static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES];
+
+/* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
+int movable_zone;
+EXPORT_SYMBOL(movable_zone);
+#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
#if MAX_NUMNODES > 1
int nr_node_ids __read_mostly = MAX_NUMNODES;
@@ -333,8 +327,8 @@ out:
*
* The remaining PAGE_SIZE pages are called "tail pages".
*
- * All pages have PG_compound set. All pages have their ->private pointing at
- * the head page (even the head page has this).
+ * All pages have PG_compound set. All tail pages have their ->first_page
+ * pointing at the head page.
*
* The first tail page's ->lru.next holds the address of the compound page's
* put_page() function. Its ->lru.prev holds the order of allocation.
@@ -403,6 +397,37 @@ static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags)
clear_highpage(page + i);
}
+#ifdef CONFIG_DEBUG_PAGEALLOC
+unsigned int _debug_guardpage_minorder;
+
+static int __init debug_guardpage_minorder_setup(char *buf)
+{
+ unsigned long res;
+
+ if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) {
+ printk(KERN_ERR "Bad debug_guardpage_minorder value\n");
+ return 0;
+ }
+ _debug_guardpage_minorder = res;
+ printk(KERN_INFO "Setting debug_guardpage_minorder to %lu\n", res);
+ return 0;
+}
+__setup("debug_guardpage_minorder=", debug_guardpage_minorder_setup);
+
+static inline void set_page_guard_flag(struct page *page)
+{
+ __set_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags);
+}
+
+static inline void clear_page_guard_flag(struct page *page)
+{
+ __clear_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags);
+}
+#else
+static inline void set_page_guard_flag(struct page *page) { }
+static inline void clear_page_guard_flag(struct page *page) { }
+#endif
+
static inline void set_page_order(struct page *page, int order)
{
set_page_private(page, order);
@@ -460,6 +485,11 @@ static inline int page_is_buddy(struct page *page, struct page *buddy,
if (page_zone_id(page) != page_zone_id(buddy))
return 0;
+ if (page_is_guard(buddy) && page_order(buddy) == order) {
+ VM_BUG_ON(page_count(buddy) != 0);
+ return 1;
+ }
+
if (PageBuddy(buddy) && page_order(buddy) == order) {
VM_BUG_ON(page_count(buddy) != 0);
return 1;
@@ -516,11 +546,19 @@ static inline void __free_one_page(struct page *page,
buddy = page + (buddy_idx - page_idx);
if (!page_is_buddy(page, buddy, order))
break;
-
- /* Our buddy is free, merge with it and move up one order. */
- list_del(&buddy->lru);
- zone->free_area[order].nr_free--;
- rmv_page_order(buddy);
+ /*
+ * Our buddy is free or it is CONFIG_DEBUG_PAGEALLOC guard page,
+ * merge with it and move up one order.
+ */
+ if (page_is_guard(buddy)) {
+ clear_page_guard_flag(buddy);
+ set_page_private(page, 0);
+ __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order);
+ } else {
+ list_del(&buddy->lru);
+ zone->free_area[order].nr_free--;
+ rmv_page_order(buddy);
+ }
combined_idx = buddy_idx & page_idx;
page = page + (combined_idx - page_idx);
page_idx = combined_idx;
@@ -654,7 +692,7 @@ static bool free_pages_prepare(struct page *page, unsigned int order)
int i;
int bad = 0;
- trace_mm_page_free_direct(page, order);
+ trace_mm_page_free(page, order);
kmemcheck_free_shadow(page, order);
if (PageAnon(page))
@@ -692,32 +730,23 @@ static void __free_pages_ok(struct page *page, unsigned int order)
local_irq_restore(flags);
}
-/*
- * permit the bootmem allocator to evade page validation on high-order frees
- */
void __meminit __free_pages_bootmem(struct page *page, unsigned int order)
{
- if (order == 0) {
- __ClearPageReserved(page);
- set_page_count(page, 0);
- set_page_refcounted(page);
- __free_page(page);
- } else {
- int loop;
+ unsigned int nr_pages = 1 << order;
+ unsigned int loop;
- prefetchw(page);
- for (loop = 0; loop < BITS_PER_LONG; loop++) {
- struct page *p = &page[loop];
+ prefetchw(page);
+ for (loop = 0; loop < nr_pages; loop++) {
+ struct page *p = &page[loop];
- if (loop + 1 < BITS_PER_LONG)
- prefetchw(p + 1);
- __ClearPageReserved(p);
- set_page_count(p, 0);
- }
-
- set_page_refcounted(page);
- __free_pages(page, order);
+ if (loop + 1 < nr_pages)
+ prefetchw(p + 1);
+ __ClearPageReserved(p);
+ set_page_count(p, 0);
}
+
+ set_page_refcounted(page);
+ __free_pages(page, order);
}
@@ -746,6 +775,23 @@ static inline void expand(struct zone *zone, struct page *page,
high--;
size >>= 1;
VM_BUG_ON(bad_range(zone, &page[size]));
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+ if (high < debug_guardpage_minorder()) {
+ /*
+ * Mark as guard pages (or page), that will allow to
+ * merge back to allocator when buddy will be freed.
+ * Corresponding page table entries will not be touched,
+ * pages will stay not present in virtual address space
+ */
+ INIT_LIST_HEAD(&page[size].lru);
+ set_page_guard_flag(&page[size]);
+ set_page_private(&page[size], high);
+ /* Guard pages are not available for any usage */
+ __mod_zone_page_state(zone, NR_FREE_PAGES, -(1 << high));
+ continue;
+ }
+#endif
list_add(&page[size].lru, &area->free_list[migratetype]);
area->nr_free++;
set_page_order(&page[size], high);
@@ -1211,6 +1257,19 @@ out:
}
/*
+ * Free a list of 0-order pages
+ */
+void free_hot_cold_page_list(struct list_head *list, int cold)
+{
+ struct page *page, *next;
+
+ list_for_each_entry_safe(page, next, list, lru) {
+ trace_mm_page_free_batched(page, cold);
+ free_hot_cold_page(page, cold);
+ }
+}
+
+/*
* split_page takes a non-compound higher-order page, and splits it into
* n (1<<order) sub-pages: page[0..n]
* Each sub-page must be freed individually.
@@ -1408,7 +1467,7 @@ static int should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
static int __init fail_page_alloc_debugfs(void)
{
- mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
+ umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
struct dentry *dir;
dir = fault_create_debugfs_attr("fail_page_alloc", NULL,
@@ -1457,7 +1516,7 @@ static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
long min = mark;
int o;
- free_pages -= (1 << order) + 1;
+ free_pages -= (1 << order) - 1;
if (alloc_flags & ALLOC_HIGH)
min -= min / 2;
if (alloc_flags & ALLOC_HARDER)
@@ -1667,6 +1726,35 @@ zonelist_scan:
if ((alloc_flags & ALLOC_CPUSET) &&
!cpuset_zone_allowed_softwall(zone, gfp_mask))
continue;
+ /*
+ * When allocating a page cache page for writing, we
+ * want to get it from a zone that is within its dirty
+ * limit, such that no single zone holds more than its
+ * proportional share of globally allowed dirty pages.
+ * The dirty limits take into account the zone's
+ * lowmem reserves and high watermark so that kswapd
+ * should be able to balance it without having to
+ * write pages from its LRU list.
+ *
+ * This may look like it could increase pressure on
+ * lower zones by failing allocations in higher zones
+ * before they are full. But the pages that do spill
+ * over are limited as the lower zones are protected
+ * by this very same mechanism. It should not become
+ * a practical burden to them.
+ *
+ * XXX: For now, allow allocations to potentially
+ * exceed the per-zone dirty limit in the slowpath
+ * (ALLOC_WMARK_LOW unset) before going into reclaim,
+ * which is important when on a NUMA setup the allowed
+ * zones are together not big enough to reach the
+ * global limit. The proper fix for these situations
+ * will require awareness of zones in the
+ * dirty-throttling and the flusher threads.
+ */
+ if ((alloc_flags & ALLOC_WMARK_LOW) &&
+ (gfp_mask & __GFP_WRITE) && !zone_dirty_ok(zone))
+ goto this_zone_full;
BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK);
if (!(alloc_flags & ALLOC_NO_WATERMARKS)) {
@@ -1756,7 +1844,8 @@ void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...)
{
unsigned int filter = SHOW_MEM_FILTER_NODES;
- if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs))
+ if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs) ||
+ debug_guardpage_minorder() > 0)
return;
/*
@@ -1795,12 +1884,25 @@ void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...)
static inline int
should_alloc_retry(gfp_t gfp_mask, unsigned int order,
+ unsigned long did_some_progress,
unsigned long pages_reclaimed)
{
/* Do not loop if specifically requested */
if (gfp_mask & __GFP_NORETRY)
return 0;
+ /* Always retry if specifically requested */
+ if (gfp_mask & __GFP_NOFAIL)
+ return 1;
+
+ /*
+ * Suspend converts GFP_KERNEL to __GFP_WAIT which can prevent reclaim
+ * making forward progress without invoking OOM. Suspend also disables
+ * storage devices so kswapd will not help. Bail if we are suspending.
+ */
+ if (!did_some_progress && pm_suspended_storage())
+ return 0;
+
/*
* In this implementation, order <= PAGE_ALLOC_COSTLY_ORDER
* means __GFP_NOFAIL, but that may not be true in other
@@ -1819,13 +1921,6 @@ should_alloc_retry(gfp_t gfp_mask, unsigned int order,
if (gfp_mask & __GFP_REPEAT && pages_reclaimed < (1 << order))
return 1;
- /*
- * Don't let big-order allocations loop unless the caller
- * explicitly requests that.
- */
- if (gfp_mask & __GFP_NOFAIL)
- return 1;
-
return 0;
}
@@ -1886,14 +1981,20 @@ static struct page *
__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
struct zonelist *zonelist, enum zone_type high_zoneidx,
nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
- int migratetype, unsigned long *did_some_progress,
- bool sync_migration)
+ int migratetype, bool sync_migration,
+ bool *deferred_compaction,
+ unsigned long *did_some_progress)
{
struct page *page;
- if (!order || compaction_deferred(preferred_zone))
+ if (!order)
return NULL;
+ if (compaction_deferred(preferred_zone)) {
+ *deferred_compaction = true;
+ return NULL;
+ }
+
current->flags |= PF_MEMALLOC;
*did_some_progress = try_to_compact_pages(zonelist, order, gfp_mask,
nodemask, sync_migration);
@@ -1921,7 +2022,13 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
* but not enough to satisfy watermarks.
*/
count_vm_event(COMPACTFAIL);
- defer_compaction(preferred_zone);
+
+ /*
+ * As async compaction considers a subset of pageblocks, only
+ * defer if the failure was a sync compaction failure.
+ */
+ if (sync_migration)
+ defer_compaction(preferred_zone);
cond_resched();
}
@@ -1933,8 +2040,9 @@ static inline struct page *
__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
struct zonelist *zonelist, enum zone_type high_zoneidx,
nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
- int migratetype, unsigned long *did_some_progress,
- bool sync_migration)
+ int migratetype, bool sync_migration,
+ bool *deferred_compaction,
+ unsigned long *did_some_progress)
{
return NULL;
}
@@ -2084,6 +2192,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
unsigned long pages_reclaimed = 0;
unsigned long did_some_progress;
bool sync_migration = false;
+ bool deferred_compaction = false;
/*
* In the slowpath, we sanity check order to avoid ever trying to
@@ -2164,12 +2273,22 @@ rebalance:
zonelist, high_zoneidx,
nodemask,
alloc_flags, preferred_zone,
- migratetype, &did_some_progress,
- sync_migration);
+ migratetype, sync_migration,
+ &deferred_compaction,
+ &did_some_progress);
if (page)
goto got_pg;
sync_migration = true;
+ /*
+ * If compaction is deferred for high-order allocations, it is because
+ * sync compaction recently failed. In this is the case and the caller
+ * has requested the system not be heavily disrupted, fail the
+ * allocation now instead of entering direct reclaim
+ */
+ if (deferred_compaction && (gfp_mask & __GFP_NO_KSWAPD))
+ goto nopage;
+
/* Try direct reclaim and then allocating */
page = __alloc_pages_direct_reclaim(gfp_mask, order,
zonelist, high_zoneidx,
@@ -2218,7 +2337,8 @@ rebalance:
/* Check if we should retry the allocation */
pages_reclaimed += did_some_progress;
- if (should_alloc_retry(gfp_mask, order, pages_reclaimed)) {
+ if (should_alloc_retry(gfp_mask, order, did_some_progress,
+ pages_reclaimed)) {
/* Wait for some write requests to complete then retry */
wait_iff_congested(preferred_zone, BLK_RW_ASYNC, HZ/50);
goto rebalance;
@@ -2232,8 +2352,9 @@ rebalance:
zonelist, high_zoneidx,
nodemask,
alloc_flags, preferred_zone,
- migratetype, &did_some_progress,
- sync_migration);
+ migratetype, sync_migration,
+ &deferred_compaction,
+ &did_some_progress);
if (page)
goto got_pg;
}
@@ -2328,16 +2449,6 @@ unsigned long get_zeroed_page(gfp_t gfp_mask)
}
EXPORT_SYMBOL(get_zeroed_page);
-void __pagevec_free(struct pagevec *pvec)
-{
- int i = pagevec_count(pvec);
-
- while (--i >= 0) {
- trace_mm_pagevec_free(pvec->pages[i], pvec->cold);
- free_hot_cold_page(pvec->pages[i], pvec->cold);
- }
-}
-
void __free_pages(struct page *page, unsigned int order)
{
if (put_page_testzero(page)) {
@@ -3407,25 +3518,33 @@ static void setup_zone_migrate_reserve(struct zone *zone)
if (page_to_nid(page) != zone_to_nid(zone))
continue;
- /* Blocks with reserved pages will never free, skip them. */
- block_end_pfn = min(pfn + pageblock_nr_pages, end_pfn);
- if (pageblock_is_reserved(pfn, block_end_pfn))
- continue;
-
block_migratetype = get_pageblock_migratetype(page);
- /* If this block is reserved, account for it */
- if (reserve > 0 && block_migratetype == MIGRATE_RESERVE) {
- reserve--;
- continue;
- }
+ /* Only test what is necessary when the reserves are not met */
+ if (reserve > 0) {
+ /*
+ * Blocks with reserved pages will never free, skip
+ * them.
+ */
+ block_end_pfn = min(pfn + pageblock_nr_pages, end_pfn);
+ if (pageblock_is_reserved(pfn, block_end_pfn))
+ continue;
- /* Suitable for reserving if this block is movable */
- if (reserve > 0 && block_migratetype == MIGRATE_MOVABLE) {
- set_pageblock_migratetype(page, MIGRATE_RESERVE);
- move_freepages_block(zone, page, MIGRATE_RESERVE);
- reserve--;
- continue;
+ /* If this block is reserved, account for it */
+ if (block_migratetype == MIGRATE_RESERVE) {
+ reserve--;
+ continue;
+ }
+
+ /* Suitable for reserving if this block is movable */
+ if (block_migratetype == MIGRATE_MOVABLE) {
+ set_pageblock_migratetype(page,
+ MIGRATE_RESERVE);
+ move_freepages_block(zone, page,
+ MIGRATE_RESERVE);
+ reserve--;
+ continue;
+ }
}
/*
@@ -3737,35 +3856,7 @@ __meminit int init_currently_empty_zone(struct zone *zone,
return 0;
}
-#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
-/*
- * Basic iterator support. Return the first range of PFNs for a node
- * Note: nid == MAX_NUMNODES returns first region regardless of node
- */
-static int __meminit first_active_region_index_in_nid(int nid)
-{
- int i;
-
- for (i = 0; i < nr_nodemap_entries; i++)
- if (nid == MAX_NUMNODES || early_node_map[i].nid == nid)
- return i;
-
- return -1;
-}
-
-/*
- * Basic iterator support. Return the next active range of PFNs for a node
- * Note: nid == MAX_NUMNODES returns next region regardless of node
- */
-static int __meminit next_active_region_index_in_nid(int index, int nid)
-{
- for (index = index + 1; index < nr_nodemap_entries; index++)
- if (nid == MAX_NUMNODES || early_node_map[index].nid == nid)
- return index;
-
- return -1;
-}
-
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
/*
* Required by SPARSEMEM. Given a PFN, return what node the PFN is on.
@@ -3775,15 +3866,12 @@ static int __meminit next_active_region_index_in_nid(int index, int nid)
*/
int __meminit __early_pfn_to_nid(unsigned long pfn)
{
- int i;
-
- for (i = 0; i < nr_nodemap_entries; i++) {
- unsigned long start_pfn = early_node_map[i].start_pfn;
- unsigned long end_pfn = early_node_map[i].end_pfn;
+ unsigned long start_pfn, end_pfn;
+ int i, nid;
+ for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid)
if (start_pfn <= pfn && pfn < end_pfn)
- return early_node_map[i].nid;
- }
+ return nid;
/* This is a memory hole */
return -1;
}
@@ -3812,11 +3900,6 @@ bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
}
#endif
-/* Basic iterator support to walk early_node_map[] */
-#define for_each_active_range_index_in_nid(i, nid) \
- for (i = first_active_region_index_in_nid(nid); i != -1; \
- i = next_active_region_index_in_nid(i, nid))
-
/**
* free_bootmem_with_active_regions - Call free_bootmem_node for each active range
* @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed.
@@ -3826,122 +3909,34 @@ bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
* add_active_ranges() contain no holes and may be freed, this
* this function may be used instead of calling free_bootmem() manually.
*/
-void __init free_bootmem_with_active_regions(int nid,
- unsigned long max_low_pfn)
-{
- int i;
-
- for_each_active_range_index_in_nid(i, nid) {
- unsigned long size_pages = 0;
- unsigned long end_pfn = early_node_map[i].end_pfn;
-
- if (early_node_map[i].start_pfn >= max_low_pfn)
- continue;
-
- if (end_pfn > max_low_pfn)
- end_pfn = max_low_pfn;
-
- size_pages = end_pfn - early_node_map[i].start_pfn;
- free_bootmem_node(NODE_DATA(early_node_map[i].nid),
- PFN_PHYS(early_node_map[i].start_pfn),
- size_pages << PAGE_SHIFT);
- }
-}
-
-#ifdef CONFIG_HAVE_MEMBLOCK
-/*
- * Basic iterator support. Return the last range of PFNs for a node
- * Note: nid == MAX_NUMNODES returns last region regardless of node
- */
-static int __meminit last_active_region_index_in_nid(int nid)
+void __init free_bootmem_with_active_regions(int nid, unsigned long max_low_pfn)
{
- int i;
-
- for (i = nr_nodemap_entries - 1; i >= 0; i--)
- if (nid == MAX_NUMNODES || early_node_map[i].nid == nid)
- return i;
-
- return -1;
-}
-
-/*
- * Basic iterator support. Return the previous active range of PFNs for a node
- * Note: nid == MAX_NUMNODES returns next region regardless of node
- */
-static int __meminit previous_active_region_index_in_nid(int index, int nid)
-{
- for (index = index - 1; index >= 0; index--)
- if (nid == MAX_NUMNODES || early_node_map[index].nid == nid)
- return index;
-
- return -1;
-}
-
-#define for_each_active_range_index_in_nid_reverse(i, nid) \
- for (i = last_active_region_index_in_nid(nid); i != -1; \
- i = previous_active_region_index_in_nid(i, nid))
-
-u64 __init find_memory_core_early(int nid, u64 size, u64 align,
- u64 goal, u64 limit)
-{
- int i;
-
- /* Need to go over early_node_map to find out good range for node */
- for_each_active_range_index_in_nid_reverse(i, nid) {
- u64 addr;
- u64 ei_start, ei_last;
- u64 final_start, final_end;
-
- ei_last = early_node_map[i].end_pfn;
- ei_last <<= PAGE_SHIFT;
- ei_start = early_node_map[i].start_pfn;
- ei_start <<= PAGE_SHIFT;
-
- final_start = max(ei_start, goal);
- final_end = min(ei_last, limit);
-
- if (final_start >= final_end)
- continue;
-
- addr = memblock_find_in_range(final_start, final_end, size, align);
+ unsigned long start_pfn, end_pfn;
+ int i, this_nid;
- if (addr == MEMBLOCK_ERROR)
- continue;
+ for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) {
+ start_pfn = min(start_pfn, max_low_pfn);
+ end_pfn = min(end_pfn, max_low_pfn);
- return addr;
+ if (start_pfn < end_pfn)
+ free_bootmem_node(NODE_DATA(this_nid),
+ PFN_PHYS(start_pfn),
+ (end_pfn - start_pfn) << PAGE_SHIFT);
}
-
- return MEMBLOCK_ERROR;
}
-#endif
int __init add_from_early_node_map(struct range *range, int az,
int nr_range, int nid)
{
+ unsigned long start_pfn, end_pfn;
int i;
- u64 start, end;
/* need to go over early_node_map to find out good range for node */
- for_each_active_range_index_in_nid(i, nid) {
- start = early_node_map[i].start_pfn;
- end = early_node_map[i].end_pfn;
- nr_range = add_range(range, az, nr_range, start, end);
- }
+ for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL)
+ nr_range = add_range(range, az, nr_range, start_pfn, end_pfn);
return nr_range;
}
-void __init work_with_active_regions(int nid, work_fn_t work_fn, void *data)
-{
- int i;
- int ret;
-
- for_each_active_range_index_in_nid(i, nid) {
- ret = work_fn(early_node_map[i].start_pfn,
- early_node_map[i].end_pfn, data);
- if (ret)
- break;
- }
-}
/**
* sparse_memory_present_with_active_regions - Call memory_present for each active range
* @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used.
@@ -3952,12 +3947,11 @@ void __init work_with_active_regions(int nid, work_fn_t work_fn, void *data)
*/
void __init sparse_memory_present_with_active_regions(int nid)
{
- int i;
+ unsigned long start_pfn, end_pfn;
+ int i, this_nid;
- for_each_active_range_index_in_nid(i, nid)
- memory_present(early_node_map[i].nid,
- early_node_map[i].start_pfn,
- early_node_map[i].end_pfn);
+ for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid)
+ memory_present(this_nid, start_pfn, end_pfn);
}
/**
@@ -3974,13 +3968,15 @@ void __init sparse_memory_present_with_active_regions(int nid)
void __meminit get_pfn_range_for_nid(unsigned int nid,
unsigned long *start_pfn, unsigned long *end_pfn)
{
+ unsigned long this_start_pfn, this_end_pfn;
int i;
+
*start_pfn = -1UL;
*end_pfn = 0;
- for_each_active_range_index_in_nid(i, nid) {
- *start_pfn = min(*start_pfn, early_node_map[i].start_pfn);
- *end_pfn = max(*end_pfn, early_node_map[i].end_pfn);
+ for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) {
+ *start_pfn = min(*start_pfn, this_start_pfn);
+ *end_pfn = max(*end_pfn, this_end_pfn);
}
if (*start_pfn == -1UL)
@@ -4083,46 +4079,16 @@ unsigned long __meminit __absent_pages_in_range(int nid,
unsigned long range_start_pfn,
unsigned long range_end_pfn)
{
- int i = 0;
- unsigned long prev_end_pfn = 0, hole_pages = 0;
- unsigned long start_pfn;
-
- /* Find the end_pfn of the first active range of pfns in the node */
- i = first_active_region_index_in_nid(nid);
- if (i == -1)
- return 0;
-
- prev_end_pfn = min(early_node_map[i].start_pfn, range_end_pfn);
-
- /* Account for ranges before physical memory on this node */
- if (early_node_map[i].start_pfn > range_start_pfn)
- hole_pages = prev_end_pfn - range_start_pfn;
-
- /* Find all holes for the zone within the node */
- for (; i != -1; i = next_active_region_index_in_nid(i, nid)) {
-
- /* No need to continue if prev_end_pfn is outside the zone */
- if (prev_end_pfn >= range_end_pfn)
- break;
-
- /* Make sure the end of the zone is not within the hole */
- start_pfn = min(early_node_map[i].start_pfn, range_end_pfn);
- prev_end_pfn = max(prev_end_pfn, range_start_pfn);
+ unsigned long nr_absent = range_end_pfn - range_start_pfn;
+ unsigned long start_pfn, end_pfn;
+ int i;
- /* Update the hole size cound and move on */
- if (start_pfn > range_start_pfn) {
- BUG_ON(prev_end_pfn > start_pfn);
- hole_pages += start_pfn - prev_end_pfn;
- }
- prev_end_pfn = early_node_map[i].end_pfn;
+ for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
+ start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn);
+ end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn);
+ nr_absent -= end_pfn - start_pfn;
}
-
- /* Account for ranges past physical memory on this node */
- if (range_end_pfn > prev_end_pfn)
- hole_pages += range_end_pfn -
- max(range_start_pfn, prev_end_pfn);
-
- return hole_pages;
+ return nr_absent;
}
/**
@@ -4143,14 +4109,14 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
unsigned long zone_type,
unsigned long *ignored)
{
+ unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type];
+ unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type];
unsigned long node_start_pfn, node_end_pfn;
unsigned long zone_start_pfn, zone_end_pfn;
get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn);
- zone_start_pfn = max(arch_zone_lowest_possible_pfn[zone_type],
- node_start_pfn);
- zone_end_pfn = min(arch_zone_highest_possible_pfn[zone_type],
- node_end_pfn);
+ zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high);
+ zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high);
adjust_zone_range_for_zone_movable(nid, zone_type,
node_start_pfn, node_end_pfn,
@@ -4158,7 +4124,7 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn);
}
-#else
+#else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
unsigned long zone_type,
unsigned long *zones_size)
@@ -4176,7 +4142,7 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
return zholes_size[zone_type];
}
-#endif
+#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
unsigned long *zones_size, unsigned long *zholes_size)
@@ -4296,7 +4262,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
for (j = 0; j < MAX_NR_ZONES; j++) {
struct zone *zone = pgdat->node_zones + j;
unsigned long size, realsize, memmap_pages;
- enum lru_list l;
+ enum lru_list lru;
size = zone_spanned_pages_in_node(nid, j, zones_size);
realsize = size - zone_absent_pages_in_node(nid, j,
@@ -4346,8 +4312,8 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
zone->zone_pgdat = pgdat;
zone_pcp_init(zone);
- for_each_lru(l)
- INIT_LIST_HEAD(&zone->lru[l].list);
+ for_each_lru(lru)
+ INIT_LIST_HEAD(&zone->lruvec.lists[lru]);
zone->reclaim_stat.recent_rotated[0] = 0;
zone->reclaim_stat.recent_rotated[1] = 0;
zone->reclaim_stat.recent_scanned[0] = 0;
@@ -4399,10 +4365,10 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
*/
if (pgdat == NODE_DATA(0)) {
mem_map = NODE_DATA(0)->node_mem_map;
-#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
if (page_to_pfn(mem_map) != pgdat->node_start_pfn)
mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET);
-#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
+#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
}
#endif
#endif /* CONFIG_FLAT_NODE_MEM_MAP */
@@ -4427,7 +4393,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
free_area_init_core(pgdat, zones_size, zholes_size);
}
-#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
#if MAX_NUMNODES > 1
/*
@@ -4449,170 +4415,6 @@ static inline void setup_nr_node_ids(void)
#endif
/**
- * add_active_range - Register a range of PFNs backed by physical memory
- * @nid: The node ID the range resides on
- * @start_pfn: The start PFN of the available physical memory
- * @end_pfn: The end PFN of the available physical memory
- *
- * These ranges are stored in an early_node_map[] and later used by
- * free_area_init_nodes() to calculate zone sizes and holes. If the
- * range spans a memory hole, it is up to the architecture to ensure
- * the memory is not freed by the bootmem allocator. If possible
- * the range being registered will be merged with existing ranges.
- */
-void __init add_active_range(unsigned int nid, unsigned long start_pfn,
- unsigned long end_pfn)
-{
- int i;
-
- mminit_dprintk(MMINIT_TRACE, "memory_register",
- "Entering add_active_range(%d, %#lx, %#lx) "
- "%d entries of %d used\n",
- nid, start_pfn, end_pfn,
- nr_nodemap_entries, MAX_ACTIVE_REGIONS);
-
- mminit_validate_memmodel_limits(&start_pfn, &end_pfn);
-
- /* Merge with existing active regions if possible */
- for (i = 0; i < nr_nodemap_entries; i++) {
- if (early_node_map[i].nid != nid)
- continue;
-
- /* Skip if an existing region covers this new one */
- if (start_pfn >= early_node_map[i].start_pfn &&
- end_pfn <= early_node_map[i].end_pfn)
- return;
-
- /* Merge forward if suitable */
- if (start_pfn <= early_node_map[i].end_pfn &&
- end_pfn > early_node_map[i].end_pfn) {
- early_node_map[i].end_pfn = end_pfn;
- return;
- }
-
- /* Merge backward if suitable */
- if (start_pfn < early_node_map[i].start_pfn &&
- end_pfn >= early_node_map[i].start_pfn) {
- early_node_map[i].start_pfn = start_pfn;
- return;
- }
- }
-
- /* Check that early_node_map is large enough */
- if (i >= MAX_ACTIVE_REGIONS) {
- printk(KERN_CRIT "More than %d memory regions, truncating\n",
- MAX_ACTIVE_REGIONS);
- return;
- }
-
- early_node_map[i].nid = nid;
- early_node_map[i].start_pfn = start_pfn;
- early_node_map[i].end_pfn = end_pfn;
- nr_nodemap_entries = i + 1;
-}
-
-/**
- * remove_active_range - Shrink an existing registered range of PFNs
- * @nid: The node id the range is on that should be shrunk
- * @start_pfn: The new PFN of the range
- * @end_pfn: The new PFN of the range
- *
- * i386 with NUMA use alloc_remap() to store a node_mem_map on a local node.
- * The map is kept near the end physical page range that has already been
- * registered. This function allows an arch to shrink an existing registered
- * range.
- */
-void __init remove_active_range(unsigned int nid, unsigned long start_pfn,
- unsigned long end_pfn)
-{
- int i, j;
- int removed = 0;
-
- printk(KERN_DEBUG "remove_active_range (%d, %lu, %lu)\n",
- nid, start_pfn, end_pfn);
-
- /* Find the old active region end and shrink */
- for_each_active_range_index_in_nid(i, nid) {
- if (early_node_map[i].start_pfn >= start_pfn &&
- early_node_map[i].end_pfn <= end_pfn) {
- /* clear it */
- early_node_map[i].start_pfn = 0;
- early_node_map[i].end_pfn = 0;
- removed = 1;
- continue;
- }
- if (early_node_map[i].start_pfn < start_pfn &&
- early_node_map[i].end_pfn > start_pfn) {
- unsigned long temp_end_pfn = early_node_map[i].end_pfn;
- early_node_map[i].end_pfn = start_pfn;
- if (temp_end_pfn > end_pfn)
- add_active_range(nid, end_pfn, temp_end_pfn);
- continue;
- }
- if (early_node_map[i].start_pfn >= start_pfn &&
- early_node_map[i].end_pfn > end_pfn &&
- early_node_map[i].start_pfn < end_pfn) {
- early_node_map[i].start_pfn = end_pfn;
- continue;
- }
- }
-
- if (!removed)
- return;
-
- /* remove the blank ones */
- for (i = nr_nodemap_entries - 1; i > 0; i--) {
- if (early_node_map[i].nid != nid)
- continue;
- if (early_node_map[i].end_pfn)
- continue;
- /* we found it, get rid of it */
- for (j = i; j < nr_nodemap_entries - 1; j++)
- memcpy(&early_node_map[j], &early_node_map[j+1],
- sizeof(early_node_map[j]));
- j = nr_nodemap_entries - 1;
- memset(&early_node_map[j], 0, sizeof(early_node_map[j]));
- nr_nodemap_entries--;
- }
-}
-
-/**
- * remove_all_active_ranges - Remove all currently registered regions
- *
- * During discovery, it may be found that a table like SRAT is invalid
- * and an alternative discovery method must be used. This function removes
- * all currently registered regions.
- */
-void __init remove_all_active_ranges(void)
-{
- memset(early_node_map, 0, sizeof(early_node_map));
- nr_nodemap_entries = 0;
-}
-
-/* Compare two active node_active_regions */
-static int __init cmp_node_active_region(const void *a, const void *b)
-{
- struct node_active_region *arange = (struct node_active_region *)a;
- struct node_active_region *brange = (struct node_active_region *)b;
-
- /* Done this way to avoid overflows */
- if (arange->start_pfn > brange->start_pfn)
- return 1;
- if (arange->start_pfn < brange->start_pfn)
- return -1;
-
- return 0;
-}
-
-/* sort the node_map by start_pfn */
-void __init sort_node_map(void)
-{
- sort(early_node_map, (size_t)nr_nodemap_entries,
- sizeof(struct node_active_region),
- cmp_node_active_region, NULL);
-}
-
-/**
* node_map_pfn_alignment - determine the maximum internode alignment
*
* This function should be called after node map is populated and sorted.
@@ -4634,15 +4436,11 @@ void __init sort_node_map(void)
unsigned long __init node_map_pfn_alignment(void)
{
unsigned long accl_mask = 0, last_end = 0;
+ unsigned long start, end, mask;
int last_nid = -1;
- int i;
-
- for_each_active_range_index_in_nid(i, MAX_NUMNODES) {
- int nid = early_node_map[i].nid;
- unsigned long start = early_node_map[i].start_pfn;
- unsigned long end = early_node_map[i].end_pfn;
- unsigned long mask;
+ int i, nid;
+ for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) {
if (!start || last_nid < 0 || last_nid == nid) {
last_nid = nid;
last_end = end;
@@ -4669,12 +4467,12 @@ unsigned long __init node_map_pfn_alignment(void)
/* Find the lowest pfn for a node */
static unsigned long __init find_min_pfn_for_node(int nid)
{
- int i;
unsigned long min_pfn = ULONG_MAX;
+ unsigned long start_pfn;
+ int i;
- /* Assuming a sorted map, the first range found has the starting pfn */
- for_each_active_range_index_in_nid(i, nid)
- min_pfn = min(min_pfn, early_node_map[i].start_pfn);
+ for_each_mem_pfn_range(i, nid, &start_pfn, NULL, NULL)
+ min_pfn = min(min_pfn, start_pfn);
if (min_pfn == ULONG_MAX) {
printk(KERN_WARNING
@@ -4703,15 +4501,16 @@ unsigned long __init find_min_pfn_with_active_regions(void)
*/
static unsigned long __init early_calculate_totalpages(void)
{
- int i;
unsigned long totalpages = 0;
+ unsigned long start_pfn, end_pfn;
+ int i, nid;
+
+ for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) {
+ unsigned long pages = end_pfn - start_pfn;
- for (i = 0; i < nr_nodemap_entries; i++) {
- unsigned long pages = early_node_map[i].end_pfn -
- early_node_map[i].start_pfn;
totalpages += pages;
if (pages)
- node_set_state(early_node_map[i].nid, N_HIGH_MEMORY);
+ node_set_state(nid, N_HIGH_MEMORY);
}
return totalpages;
}
@@ -4766,6 +4565,8 @@ restart:
/* Spread kernelcore memory as evenly as possible throughout nodes */
kernelcore_node = required_kernelcore / usable_nodes;
for_each_node_state(nid, N_HIGH_MEMORY) {
+ unsigned long start_pfn, end_pfn;
+
/*
* Recalculate kernelcore_node if the division per node
* now exceeds what is necessary to satisfy the requested
@@ -4782,13 +4583,10 @@ restart:
kernelcore_remaining = kernelcore_node;
/* Go through each range of PFNs within this node */
- for_each_active_range_index_in_nid(i, nid) {
- unsigned long start_pfn, end_pfn;
+ for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
unsigned long size_pages;
- start_pfn = max(early_node_map[i].start_pfn,
- zone_movable_pfn[nid]);
- end_pfn = early_node_map[i].end_pfn;
+ start_pfn = max(start_pfn, zone_movable_pfn[nid]);
if (start_pfn >= end_pfn)
continue;
@@ -4869,8 +4667,10 @@ static void check_for_regular_memory(pg_data_t *pgdat)
for (zone_type = 0; zone_type <= ZONE_NORMAL; zone_type++) {
struct zone *zone = &pgdat->node_zones[zone_type];
- if (zone->present_pages)
+ if (zone->present_pages) {
node_set_state(zone_to_nid(zone), N_NORMAL_MEMORY);
+ break;
+ }
}
#endif
}
@@ -4890,11 +4690,8 @@ static void check_for_regular_memory(pg_data_t *pgdat)
*/
void __init free_area_init_nodes(unsigned long *max_zone_pfn)
{
- unsigned long nid;
- int i;
-
- /* Sort early_node_map as initialisation assumes it is sorted */
- sort_node_map();
+ unsigned long start_pfn, end_pfn;
+ int i, nid;
/* Record where the zone boundaries are */
memset(arch_zone_lowest_possible_pfn, 0,
@@ -4941,11 +4738,9 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
}
/* Print out the early_node_map[] */
- printk("early_node_map[%d] active PFN ranges\n", nr_nodemap_entries);
- for (i = 0; i < nr_nodemap_entries; i++)
- printk(" %3d: %0#10lx -> %0#10lx\n", early_node_map[i].nid,
- early_node_map[i].start_pfn,
- early_node_map[i].end_pfn);
+ printk("Early memory PFN ranges\n");
+ for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid)
+ printk(" %3d: %0#10lx -> %0#10lx\n", nid, start_pfn, end_pfn);
/* Initialise every node */
mminit_verify_pageflags_layout();
@@ -4998,7 +4793,7 @@ static int __init cmdline_parse_movablecore(char *p)
early_param("kernelcore", cmdline_parse_kernelcore);
early_param("movablecore", cmdline_parse_movablecore);
-#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
+#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
/**
* set_dma_reserve - set the specified number of pages reserved in the first zone
@@ -5082,8 +4877,19 @@ static void calculate_totalreserve_pages(void)
if (max > zone->present_pages)
max = zone->present_pages;
reserve_pages += max;
+ /*
+ * Lowmem reserves are not available to
+ * GFP_HIGHUSER page cache allocations and
+ * kswapd tries to balance zones to their high
+ * watermark. As a result, neither should be
+ * regarded as dirtyable memory, to prevent a
+ * situation where reclaim has to clean pages
+ * in order to balance the zones.
+ */
+ zone->dirty_balance_reserve = max;
}
}
+ dirty_balance_reserve = reserve_pages;
totalreserve_pages = reserve_pages;
}
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 2d123f94a8df..de1616aa9b1e 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -11,13 +11,6 @@
#include <linux/swapops.h>
#include <linux/kmemleak.h>
-static void __meminit init_page_cgroup(struct page_cgroup *pc, unsigned long id)
-{
- pc->flags = 0;
- set_page_cgroup_array_id(pc, id);
- pc->mem_cgroup = NULL;
- INIT_LIST_HEAD(&pc->lru);
-}
static unsigned long total_usage;
#if !defined(CONFIG_SPARSEMEM)
@@ -35,35 +28,27 @@ struct page_cgroup *lookup_page_cgroup(struct page *page)
struct page_cgroup *base;
base = NODE_DATA(page_to_nid(page))->node_page_cgroup;
+#ifdef CONFIG_DEBUG_VM
+ /*
+ * The sanity checks the page allocator does upon freeing a
+ * page can reach here before the page_cgroup arrays are
+ * allocated when feeding a range of pages to the allocator
+ * for the first time during bootup or memory hotplug.
+ */
if (unlikely(!base))
return NULL;
-
+#endif
offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn;
return base + offset;
}
-struct page *lookup_cgroup_page(struct page_cgroup *pc)
-{
- unsigned long pfn;
- struct page *page;
- pg_data_t *pgdat;
-
- pgdat = NODE_DATA(page_cgroup_array_id(pc));
- pfn = pc - pgdat->node_page_cgroup + pgdat->node_start_pfn;
- page = pfn_to_page(pfn);
- VM_BUG_ON(pc != lookup_page_cgroup(page));
- return page;
-}
-
static int __init alloc_node_page_cgroup(int nid)
{
- struct page_cgroup *base, *pc;
+ struct page_cgroup *base;
unsigned long table_size;
- unsigned long start_pfn, nr_pages, index;
+ unsigned long nr_pages;
- start_pfn = NODE_DATA(nid)->node_start_pfn;
nr_pages = NODE_DATA(nid)->node_spanned_pages;
-
if (!nr_pages)
return 0;
@@ -73,10 +58,6 @@ static int __init alloc_node_page_cgroup(int nid)
table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
if (!base)
return -ENOMEM;
- for (index = 0; index < nr_pages; index++) {
- pc = base + index;
- init_page_cgroup(pc, nid);
- }
NODE_DATA(nid)->node_page_cgroup = base;
total_usage += table_size;
return 0;
@@ -111,29 +92,23 @@ struct page_cgroup *lookup_page_cgroup(struct page *page)
{
unsigned long pfn = page_to_pfn(page);
struct mem_section *section = __pfn_to_section(pfn);
-
+#ifdef CONFIG_DEBUG_VM
+ /*
+ * The sanity checks the page allocator does upon freeing a
+ * page can reach here before the page_cgroup arrays are
+ * allocated when feeding a range of pages to the allocator
+ * for the first time during bootup or memory hotplug.
+ */
if (!section->page_cgroup)
return NULL;
+#endif
return section->page_cgroup + pfn;
}
-struct page *lookup_cgroup_page(struct page_cgroup *pc)
-{
- struct mem_section *section;
- struct page *page;
- unsigned long nr;
-
- nr = page_cgroup_array_id(pc);
- section = __nr_to_section(nr);
- page = pfn_to_page(pc - section->page_cgroup);
- VM_BUG_ON(pc != lookup_page_cgroup(page));
- return page;
-}
-
static void *__meminit alloc_page_cgroup(size_t size, int nid)
{
+ gfp_t flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN;
void *addr = NULL;
- gfp_t flags = GFP_KERNEL | __GFP_NOWARN;
addr = alloc_pages_exact_nid(nid, size, flags);
if (addr) {
@@ -142,39 +117,20 @@ static void *__meminit alloc_page_cgroup(size_t size, int nid)
}
if (node_state(nid, N_HIGH_MEMORY))
- addr = vmalloc_node(size, nid);
+ addr = vzalloc_node(size, nid);
else
- addr = vmalloc(size);
+ addr = vzalloc(size);
return addr;
}
-#ifdef CONFIG_MEMORY_HOTPLUG
-static void free_page_cgroup(void *addr)
-{
- if (is_vmalloc_addr(addr)) {
- vfree(addr);
- } else {
- struct page *page = virt_to_page(addr);
- size_t table_size =
- sizeof(struct page_cgroup) * PAGES_PER_SECTION;
-
- BUG_ON(PageReserved(page));
- free_pages_exact(addr, table_size);
- }
-}
-#endif
-
static int __meminit init_section_page_cgroup(unsigned long pfn, int nid)
{
- struct page_cgroup *base, *pc;
struct mem_section *section;
+ struct page_cgroup *base;
unsigned long table_size;
- unsigned long nr;
- int index;
- nr = pfn_to_section_nr(pfn);
- section = __nr_to_section(nr);
+ section = __pfn_to_section(pfn);
if (section->page_cgroup)
return 0;
@@ -194,10 +150,6 @@ static int __meminit init_section_page_cgroup(unsigned long pfn, int nid)
return -ENOMEM;
}
- for (index = 0; index < PAGES_PER_SECTION; index++) {
- pc = base + index;
- init_page_cgroup(pc, nr);
- }
/*
* The passed "pfn" may not be aligned to SECTION. For the calculation
* we need to apply a mask.
@@ -208,6 +160,20 @@ static int __meminit init_section_page_cgroup(unsigned long pfn, int nid)
return 0;
}
#ifdef CONFIG_MEMORY_HOTPLUG
+static void free_page_cgroup(void *addr)
+{
+ if (is_vmalloc_addr(addr)) {
+ vfree(addr);
+ } else {
+ struct page *page = virt_to_page(addr);
+ size_t table_size =
+ sizeof(struct page_cgroup) * PAGES_PER_SECTION;
+
+ BUG_ON(PageReserved(page));
+ free_pages_exact(addr, table_size);
+ }
+}
+
void __free_page_cgroup(unsigned long pfn)
{
struct mem_section *ms;
@@ -366,7 +332,6 @@ struct swap_cgroup {
unsigned short id;
};
#define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup))
-#define SC_POS_MASK (SC_PER_PAGE - 1)
/*
* SwapCgroup implements "lookup" and "exchange" operations.
@@ -408,6 +373,21 @@ not_enough_page:
return -ENOMEM;
}
+static struct swap_cgroup *lookup_swap_cgroup(swp_entry_t ent,
+ struct swap_cgroup_ctrl **ctrlp)
+{
+ pgoff_t offset = swp_offset(ent);
+ struct swap_cgroup_ctrl *ctrl;
+ struct page *mappage;
+
+ ctrl = &swap_cgroup_ctrl[swp_type(ent)];
+ if (ctrlp)
+ *ctrlp = ctrl;
+
+ mappage = ctrl->map[offset / SC_PER_PAGE];
+ return page_address(mappage) + offset % SC_PER_PAGE;
+}
+
/**
* swap_cgroup_cmpxchg - cmpxchg mem_cgroup's id for this swp_entry.
* @end: swap entry to be cmpxchged
@@ -420,21 +400,13 @@ not_enough_page:
unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
unsigned short old, unsigned short new)
{
- int type = swp_type(ent);
- unsigned long offset = swp_offset(ent);
- unsigned long idx = offset / SC_PER_PAGE;
- unsigned long pos = offset & SC_POS_MASK;
struct swap_cgroup_ctrl *ctrl;
- struct page *mappage;
struct swap_cgroup *sc;
unsigned long flags;
unsigned short retval;
- ctrl = &swap_cgroup_ctrl[type];
+ sc = lookup_swap_cgroup(ent, &ctrl);
- mappage = ctrl->map[idx];
- sc = page_address(mappage);
- sc += pos;
spin_lock_irqsave(&ctrl->lock, flags);
retval = sc->id;
if (retval == old)
@@ -455,21 +427,13 @@ unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
*/
unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
{
- int type = swp_type(ent);
- unsigned long offset = swp_offset(ent);
- unsigned long idx = offset / SC_PER_PAGE;
- unsigned long pos = offset & SC_POS_MASK;
struct swap_cgroup_ctrl *ctrl;
- struct page *mappage;
struct swap_cgroup *sc;
unsigned short old;
unsigned long flags;
- ctrl = &swap_cgroup_ctrl[type];
+ sc = lookup_swap_cgroup(ent, &ctrl);
- mappage = ctrl->map[idx];
- sc = page_address(mappage);
- sc += pos;
spin_lock_irqsave(&ctrl->lock, flags);
old = sc->id;
sc->id = id;
@@ -479,28 +443,14 @@ unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
}
/**
- * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry
+ * lookup_swap_cgroup_id - lookup mem_cgroup id tied to swap entry
* @ent: swap entry to be looked up.
*
* Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
*/
-unsigned short lookup_swap_cgroup(swp_entry_t ent)
+unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
{
- int type = swp_type(ent);
- unsigned long offset = swp_offset(ent);
- unsigned long idx = offset / SC_PER_PAGE;
- unsigned long pos = offset & SC_POS_MASK;
- struct swap_cgroup_ctrl *ctrl;
- struct page *mappage;
- struct swap_cgroup *sc;
- unsigned short ret;
-
- ctrl = &swap_cgroup_ctrl[type];
- mappage = ctrl->map[idx];
- sc = page_address(mappage);
- sc += pos;
- ret = sc->id;
- return ret;
+ return lookup_swap_cgroup(ent, NULL)->id;
}
int swap_cgroup_swapon(int type, unsigned long max_pages)
diff --git a/mm/percpu.c b/mm/percpu.c
index 3bb810a72006..716eb4acf2fc 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1023,9 +1023,11 @@ phys_addr_t per_cpu_ptr_to_phys(void *addr)
if (!is_vmalloc_addr(addr))
return __pa(addr);
else
- return page_to_phys(vmalloc_to_page(addr));
+ return page_to_phys(vmalloc_to_page(addr)) +
+ offset_in_page(addr);
} else
- return page_to_phys(pcpu_addr_to_page(addr));
+ return page_to_phys(pcpu_addr_to_page(addr)) +
+ offset_in_page(addr);
}
/**
diff --git a/mm/rmap.c b/mm/rmap.c
index a4fd3680038b..c8454e06b6c8 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -272,6 +272,51 @@ int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src)
}
/*
+ * Some rmap walk that needs to find all ptes/hugepmds without false
+ * negatives (like migrate and split_huge_page) running concurrent
+ * with operations that copy or move pagetables (like mremap() and
+ * fork()) to be safe. They depend on the anon_vma "same_anon_vma"
+ * list to be in a certain order: the dst_vma must be placed after the
+ * src_vma in the list. This is always guaranteed by fork() but
+ * mremap() needs to call this function to enforce it in case the
+ * dst_vma isn't newly allocated and chained with the anon_vma_clone()
+ * function but just an extension of a pre-existing vma through
+ * vma_merge.
+ *
+ * NOTE: the same_anon_vma list can still be changed by other
+ * processes while mremap runs because mremap doesn't hold the
+ * anon_vma mutex to prevent modifications to the list while it
+ * runs. All we need to enforce is that the relative order of this
+ * process vmas isn't changing (we don't care about other vmas
+ * order). Each vma corresponds to an anon_vma_chain structure so
+ * there's no risk that other processes calling anon_vma_moveto_tail()
+ * and changing the same_anon_vma list under mremap() will screw with
+ * the relative order of this process vmas in the list, because we
+ * they can't alter the order of any vma that belongs to this
+ * process. And there can't be another anon_vma_moveto_tail() running
+ * concurrently with mremap() coming from this process because we hold
+ * the mmap_sem for the whole mremap(). fork() ordering dependency
+ * also shouldn't be affected because fork() only cares that the
+ * parent vmas are placed in the list before the child vmas and
+ * anon_vma_moveto_tail() won't reorder vmas from either the fork()
+ * parent or child.
+ */
+void anon_vma_moveto_tail(struct vm_area_struct *dst)
+{
+ struct anon_vma_chain *pavc;
+ struct anon_vma *root = NULL;
+
+ list_for_each_entry_reverse(pavc, &dst->anon_vma_chain, same_vma) {
+ struct anon_vma *anon_vma = pavc->anon_vma;
+ VM_BUG_ON(pavc->vma != dst);
+ root = lock_anon_vma_root(root, anon_vma);
+ list_del(&pavc->same_anon_vma);
+ list_add_tail(&pavc->same_anon_vma, &anon_vma->head);
+ }
+ unlock_anon_vma_root(root);
+}
+
+/*
* Attach vma to its own anon_vma, as well as to the anon_vmas that
* the corresponding VMA in the parent process is attached to.
* Returns 0 on success, non-zero on failure.
@@ -728,7 +773,7 @@ out:
}
static int page_referenced_anon(struct page *page,
- struct mem_cgroup *mem_cont,
+ struct mem_cgroup *memcg,
unsigned long *vm_flags)
{
unsigned int mapcount;
@@ -751,7 +796,7 @@ static int page_referenced_anon(struct page *page,
* counting on behalf of references from different
* cgroups
*/
- if (mem_cont && !mm_match_cgroup(vma->vm_mm, mem_cont))
+ if (memcg && !mm_match_cgroup(vma->vm_mm, memcg))
continue;
referenced += page_referenced_one(page, vma, address,
&mapcount, vm_flags);
@@ -766,7 +811,7 @@ static int page_referenced_anon(struct page *page,
/**
* page_referenced_file - referenced check for object-based rmap
* @page: the page we're checking references on.
- * @mem_cont: target memory controller
+ * @memcg: target memory control group
* @vm_flags: collect encountered vma->vm_flags who actually referenced the page
*
* For an object-based mapped page, find all the places it is mapped and
@@ -777,7 +822,7 @@ static int page_referenced_anon(struct page *page,
* This function is only called from page_referenced for object-based pages.
*/
static int page_referenced_file(struct page *page,
- struct mem_cgroup *mem_cont,
+ struct mem_cgroup *memcg,
unsigned long *vm_flags)
{
unsigned int mapcount;
@@ -819,7 +864,7 @@ static int page_referenced_file(struct page *page,
* counting on behalf of references from different
* cgroups
*/
- if (mem_cont && !mm_match_cgroup(vma->vm_mm, mem_cont))
+ if (memcg && !mm_match_cgroup(vma->vm_mm, memcg))
continue;
referenced += page_referenced_one(page, vma, address,
&mapcount, vm_flags);
@@ -835,7 +880,7 @@ static int page_referenced_file(struct page *page,
* page_referenced - test if the page was referenced
* @page: the page to test
* @is_locked: caller holds lock on the page
- * @mem_cont: target memory controller
+ * @memcg: target memory cgroup
* @vm_flags: collect encountered vma->vm_flags who actually referenced the page
*
* Quick test_and_clear_referenced for all mappings to a page,
@@ -843,7 +888,7 @@ static int page_referenced_file(struct page *page,
*/
int page_referenced(struct page *page,
int is_locked,
- struct mem_cgroup *mem_cont,
+ struct mem_cgroup *memcg,
unsigned long *vm_flags)
{
int referenced = 0;
@@ -859,13 +904,13 @@ int page_referenced(struct page *page,
}
}
if (unlikely(PageKsm(page)))
- referenced += page_referenced_ksm(page, mem_cont,
+ referenced += page_referenced_ksm(page, memcg,
vm_flags);
else if (PageAnon(page))
- referenced += page_referenced_anon(page, mem_cont,
+ referenced += page_referenced_anon(page, memcg,
vm_flags);
else if (page->mapping)
- referenced += page_referenced_file(page, mem_cont,
+ referenced += page_referenced_file(page, memcg,
vm_flags);
if (we_locked)
unlock_page(page);
diff --git a/mm/shmem.c b/mm/shmem.c
index d6722506d2da..feead1943d92 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1092,7 +1092,7 @@ static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
}
static struct inode *shmem_get_inode(struct super_block *sb, const struct inode *dir,
- int mode, dev_t dev, unsigned long flags)
+ umode_t mode, dev_t dev, unsigned long flags)
{
struct inode *inode;
struct shmem_inode_info *info;
@@ -1456,7 +1456,7 @@ static int shmem_statfs(struct dentry *dentry, struct kstatfs *buf)
* File creation. Allocate an inode, and we're done..
*/
static int
-shmem_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+shmem_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
{
struct inode *inode;
int error = -ENOSPC;
@@ -1489,7 +1489,7 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
return error;
}
-static int shmem_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+static int shmem_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
int error;
@@ -1499,7 +1499,7 @@ static int shmem_mkdir(struct inode *dir, struct dentry *dentry, int mode)
return 0;
}
-static int shmem_create(struct inode *dir, struct dentry *dentry, int mode,
+static int shmem_create(struct inode *dir, struct dentry *dentry, umode_t mode,
struct nameidata *nd)
{
return shmem_mknod(dir, dentry, mode | S_IFREG, 0);
@@ -2118,9 +2118,9 @@ out:
return error;
}
-static int shmem_show_options(struct seq_file *seq, struct vfsmount *vfs)
+static int shmem_show_options(struct seq_file *seq, struct dentry *root)
{
- struct shmem_sb_info *sbinfo = SHMEM_SB(vfs->mnt_sb);
+ struct shmem_sb_info *sbinfo = SHMEM_SB(root->d_sb);
if (sbinfo->max_blocks != shmem_default_max_blocks())
seq_printf(seq, ",size=%luk",
@@ -2128,7 +2128,7 @@ static int shmem_show_options(struct seq_file *seq, struct vfsmount *vfs)
if (sbinfo->max_inodes != shmem_default_max_inodes())
seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes);
if (sbinfo->mode != (S_IRWXUGO | S_ISVTX))
- seq_printf(seq, ",mode=%03o", sbinfo->mode);
+ seq_printf(seq, ",mode=%03ho", sbinfo->mode);
if (sbinfo->uid != 0)
seq_printf(seq, ",uid=%u", sbinfo->uid);
if (sbinfo->gid != 0)
@@ -2234,13 +2234,12 @@ static struct inode *shmem_alloc_inode(struct super_block *sb)
static void shmem_destroy_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
- INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode));
}
static void shmem_destroy_inode(struct inode *inode)
{
- if ((inode->i_mode & S_IFMT) == S_IFREG)
+ if (S_ISREG(inode->i_mode))
mpol_free_shared_policy(&SHMEM_I(inode)->policy);
call_rcu(&inode->i_rcu, shmem_destroy_callback);
}
diff --git a/mm/slab.c b/mm/slab.c
index 83311c9aaf9d..f0bd7857ab3b 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -121,6 +121,8 @@
#include <asm/tlbflush.h>
#include <asm/page.h>
+#include <trace/events/kmem.h>
+
/*
* DEBUG - 1 for kmem_cache_create() to honour; SLAB_RED_ZONE & SLAB_POISON.
* 0 for faster, smaller code (especially in the critical paths).
@@ -479,11 +481,13 @@ EXPORT_SYMBOL(slab_buffer_size);
#endif
/*
- * Do not go above this order unless 0 objects fit into the slab.
+ * Do not go above this order unless 0 objects fit into the slab or
+ * overridden on the command line.
*/
-#define BREAK_GFP_ORDER_HI 1
-#define BREAK_GFP_ORDER_LO 0
-static int slab_break_gfp_order = BREAK_GFP_ORDER_LO;
+#define SLAB_MAX_ORDER_HI 1
+#define SLAB_MAX_ORDER_LO 0
+static int slab_max_order = SLAB_MAX_ORDER_LO;
+static bool slab_max_order_set __initdata;
/*
* Functions for storing/retrieving the cachep and or slab from the page
@@ -852,6 +856,17 @@ static int __init noaliencache_setup(char *s)
}
__setup("noaliencache", noaliencache_setup);
+static int __init slab_max_order_setup(char *str)
+{
+ get_option(&str, &slab_max_order);
+ slab_max_order = slab_max_order < 0 ? 0 :
+ min(slab_max_order, MAX_ORDER - 1);
+ slab_max_order_set = true;
+
+ return 1;
+}
+__setup("slab_max_order=", slab_max_order_setup);
+
#ifdef CONFIG_NUMA
/*
* Special reaping functions for NUMA systems called from cache_reap().
@@ -1500,10 +1515,11 @@ void __init kmem_cache_init(void)
/*
* Fragmentation resistance on low memory - only use bigger
- * page orders on machines with more than 32MB of memory.
+ * page orders on machines with more than 32MB of memory if
+ * not overridden on the command line.
*/
- if (totalram_pages > (32 << 20) >> PAGE_SHIFT)
- slab_break_gfp_order = BREAK_GFP_ORDER_HI;
+ if (!slab_max_order_set && totalram_pages > (32 << 20) >> PAGE_SHIFT)
+ slab_max_order = SLAB_MAX_ORDER_HI;
/* Bootstrap is tricky, because several objects are allocated
* from caches that do not exist yet:
@@ -1930,8 +1946,8 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp)
/* Print header */
if (lines == 0) {
printk(KERN_ERR
- "Slab corruption: %s start=%p, len=%d\n",
- cachep->name, realobj, size);
+ "Slab corruption (%s): %s start=%p, len=%d\n",
+ print_tainted(), cachep->name, realobj, size);
print_objinfo(cachep, objp, 0);
}
/* Hexdump the affected line */
@@ -2115,7 +2131,7 @@ static size_t calculate_slab_order(struct kmem_cache *cachep,
* Large number of objects is good, but very large slabs are
* currently bad for the gfp()s.
*/
- if (gfporder >= slab_break_gfp_order)
+ if (gfporder >= slab_max_order)
break;
/*
@@ -3040,8 +3056,9 @@ static void check_slabp(struct kmem_cache *cachep, struct slab *slabp)
if (entries != cachep->num - slabp->inuse) {
bad:
printk(KERN_ERR "slab: Internal list corruption detected in "
- "cache '%s'(%d), slabp %p(%d). Hexdump:\n",
- cachep->name, cachep->num, slabp, slabp->inuse);
+ "cache '%s'(%d), slabp %p(%d). Tainted(%s). Hexdump:\n",
+ cachep->name, cachep->num, slabp, slabp->inuse,
+ print_tainted());
print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, slabp,
sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t),
1);
diff --git a/mm/slub.c b/mm/slub.c
index ed3334d9b6da..4907563ef7ff 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -366,9 +366,10 @@ static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page
const char *n)
{
VM_BUG_ON(!irqs_disabled());
-#ifdef CONFIG_CMPXCHG_DOUBLE
+#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
+ defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
if (s->flags & __CMPXCHG_DOUBLE) {
- if (cmpxchg_double(&page->freelist,
+ if (cmpxchg_double(&page->freelist, &page->counters,
freelist_old, counters_old,
freelist_new, counters_new))
return 1;
@@ -400,9 +401,10 @@ static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
void *freelist_new, unsigned long counters_new,
const char *n)
{
-#ifdef CONFIG_CMPXCHG_DOUBLE
+#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
+ defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
if (s->flags & __CMPXCHG_DOUBLE) {
- if (cmpxchg_double(&page->freelist,
+ if (cmpxchg_double(&page->freelist, &page->counters,
freelist_old, counters_old,
freelist_new, counters_new))
return 1;
@@ -570,7 +572,7 @@ static void slab_bug(struct kmem_cache *s, char *fmt, ...)
va_end(args);
printk(KERN_ERR "========================================"
"=====================================\n");
- printk(KERN_ERR "BUG %s: %s\n", s->name, buf);
+ printk(KERN_ERR "BUG %s (%s): %s\n", s->name, print_tainted(), buf);
printk(KERN_ERR "----------------------------------------"
"-------------------------------------\n\n");
}
@@ -1901,11 +1903,14 @@ static void unfreeze_partials(struct kmem_cache *s)
}
if (l != m) {
- if (l == M_PARTIAL)
+ if (l == M_PARTIAL) {
remove_partial(n, page);
- else
+ stat(s, FREE_REMOVE_PARTIAL);
+ } else {
add_partial(n, page,
DEACTIVATE_TO_TAIL);
+ stat(s, FREE_ADD_PARTIAL);
+ }
l = m;
}
@@ -1978,7 +1983,7 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
page->pobjects = pobjects;
page->next = oldpage;
- } while (irqsafe_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage);
+ } while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage);
stat(s, CPU_PARTIAL_FREE);
return pobjects;
}
@@ -2124,6 +2129,37 @@ static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags,
}
/*
+ * Check the page->freelist of a page and either transfer the freelist to the per cpu freelist
+ * or deactivate the page.
+ *
+ * The page is still frozen if the return value is not NULL.
+ *
+ * If this function returns NULL then the page has been unfrozen.
+ */
+static inline void *get_freelist(struct kmem_cache *s, struct page *page)
+{
+ struct page new;
+ unsigned long counters;
+ void *freelist;
+
+ do {
+ freelist = page->freelist;
+ counters = page->counters;
+ new.counters = counters;
+ VM_BUG_ON(!new.frozen);
+
+ new.inuse = page->objects;
+ new.frozen = freelist != NULL;
+
+ } while (!cmpxchg_double_slab(s, page,
+ freelist, counters,
+ NULL, new.counters,
+ "get_freelist"));
+
+ return freelist;
+}
+
+/*
* Slow path. The lockless freelist is empty or we need to perform
* debugging duties.
*
@@ -2144,8 +2180,6 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
{
void **object;
unsigned long flags;
- struct page new;
- unsigned long counters;
local_irq_save(flags);
#ifdef CONFIG_PREEMPT
@@ -2166,31 +2200,14 @@ redo:
goto new_slab;
}
- stat(s, ALLOC_SLOWPATH);
-
- do {
- object = c->page->freelist;
- counters = c->page->counters;
- new.counters = counters;
- VM_BUG_ON(!new.frozen);
-
- /*
- * If there is no object left then we use this loop to
- * deactivate the slab which is simple since no objects
- * are left in the slab and therefore we do not need to
- * put the page back onto the partial list.
- *
- * If there are objects left then we retrieve them
- * and use them to refill the per cpu queue.
- */
+ /* must check again c->freelist in case of cpu migration or IRQ */
+ object = c->freelist;
+ if (object)
+ goto load_freelist;
- new.inuse = c->page->objects;
- new.frozen = object != NULL;
+ stat(s, ALLOC_SLOWPATH);
- } while (!__cmpxchg_double_slab(s, c->page,
- object, counters,
- NULL, new.counters,
- "__slab_alloc"));
+ object = get_freelist(s, c->page);
if (!object) {
c->page = NULL;
@@ -2304,7 +2321,7 @@ redo:
* Since this is without lock semantics the protection is only against
* code executing on this cpu *not* from access by other cpus.
*/
- if (unlikely(!irqsafe_cpu_cmpxchg_double(
+ if (unlikely(!this_cpu_cmpxchg_double(
s->cpu_slab->freelist, s->cpu_slab->tid,
object, tid,
get_freepointer_safe(s, object), next_tid(tid)))) {
@@ -2534,7 +2551,7 @@ redo:
if (likely(page == c->page)) {
set_freepointer(s, object, c->freelist);
- if (unlikely(!irqsafe_cpu_cmpxchg_double(
+ if (unlikely(!this_cpu_cmpxchg_double(
s->cpu_slab->freelist, s->cpu_slab->tid,
c->freelist, tid,
object, next_tid(tid)))) {
@@ -2999,7 +3016,8 @@ static int kmem_cache_open(struct kmem_cache *s,
}
}
-#ifdef CONFIG_CMPXCHG_DOUBLE
+#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
+ defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
if (system_has_cmpxchg_double() && (s->flags & SLAB_DEBUG_FLAGS) == 0)
/* Enable fast mode */
s->flags |= __CMPXCHG_DOUBLE;
@@ -3028,7 +3046,9 @@ static int kmem_cache_open(struct kmem_cache *s,
* per node list when we run out of per cpu objects. We only fetch 50%
* to keep some capacity around for frees.
*/
- if (s->size >= PAGE_SIZE)
+ if (kmem_cache_debug(s))
+ s->cpu_partial = 0;
+ else if (s->size >= PAGE_SIZE)
s->cpu_partial = 2;
else if (s->size >= 1024)
s->cpu_partial = 6;
@@ -3654,6 +3674,9 @@ void __init kmem_cache_init(void)
struct kmem_cache *temp_kmem_cache_node;
unsigned long kmalloc_size;
+ if (debug_guardpage_minorder())
+ slub_max_order = 0;
+
kmem_size = offsetof(struct kmem_cache, node) +
nr_node_ids * sizeof(struct kmem_cache_node *);
@@ -4634,6 +4657,8 @@ static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf,
err = strict_strtoul(buf, 10, &objects);
if (err)
return err;
+ if (objects && kmem_cache_debug(s))
+ return -EINVAL;
s->cpu_partial = objects;
flush_all(s);
diff --git a/mm/swap.c b/mm/swap.c
index a91caf754d9b..b0f529b38979 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -23,7 +23,6 @@
#include <linux/init.h>
#include <linux/export.h>
#include <linux/mm_inline.h>
-#include <linux/buffer_head.h> /* for try_to_release_page() */
#include <linux/percpu_counter.h>
#include <linux/percpu.h>
#include <linux/cpu.h>
@@ -54,7 +53,7 @@ static void __page_cache_release(struct page *page)
spin_lock_irqsave(&zone->lru_lock, flags);
VM_BUG_ON(!PageLRU(page));
__ClearPageLRU(page);
- del_page_from_lru(zone, page);
+ del_page_from_lru_list(zone, page, page_off_lru(page));
spin_unlock_irqrestore(&zone->lru_lock, flags);
}
}
@@ -232,12 +231,14 @@ static void pagevec_lru_move_fn(struct pagevec *pvec,
static void pagevec_move_tail_fn(struct page *page, void *arg)
{
int *pgmoved = arg;
- struct zone *zone = page_zone(page);
if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
enum lru_list lru = page_lru_base_type(page);
- list_move_tail(&page->lru, &zone->lru[lru].list);
- mem_cgroup_rotate_reclaimable_page(page);
+ struct lruvec *lruvec;
+
+ lruvec = mem_cgroup_lru_move_lists(page_zone(page),
+ page, lru, lru);
+ list_move_tail(&page->lru, &lruvec->lists[lru]);
(*pgmoved)++;
}
}
@@ -368,7 +369,6 @@ void mark_page_accessed(struct page *page)
SetPageReferenced(page);
}
}
-
EXPORT_SYMBOL(mark_page_accessed);
void __lru_cache_add(struct page *page, enum lru_list lru)
@@ -377,7 +377,7 @@ void __lru_cache_add(struct page *page, enum lru_list lru)
page_cache_get(page);
if (!pagevec_add(pvec, page))
- ____pagevec_lru_add(pvec, lru);
+ __pagevec_lru_add(pvec, lru);
put_cpu_var(lru_add_pvecs);
}
EXPORT_SYMBOL(__lru_cache_add);
@@ -476,12 +476,13 @@ static void lru_deactivate_fn(struct page *page, void *arg)
*/
SetPageReclaim(page);
} else {
+ struct lruvec *lruvec;
/*
* The page's writeback ends up during pagevec
* We moves tha page into tail of inactive.
*/
- list_move_tail(&page->lru, &zone->lru[lru].list);
- mem_cgroup_rotate_reclaimable_page(page);
+ lruvec = mem_cgroup_lru_move_lists(zone, page, lru, lru);
+ list_move_tail(&page->lru, &lruvec->lists[lru]);
__count_vm_event(PGROTATED);
}
@@ -504,7 +505,7 @@ static void drain_cpu_pagevecs(int cpu)
for_each_lru(lru) {
pvec = &pvecs[lru - LRU_BASE];
if (pagevec_count(pvec))
- ____pagevec_lru_add(pvec, lru);
+ __pagevec_lru_add(pvec, lru);
}
pvec = &per_cpu(lru_rotate_pvecs, cpu);
@@ -585,11 +586,10 @@ int lru_add_drain_all(void)
void release_pages(struct page **pages, int nr, int cold)
{
int i;
- struct pagevec pages_to_free;
+ LIST_HEAD(pages_to_free);
struct zone *zone = NULL;
unsigned long uninitialized_var(flags);
- pagevec_init(&pages_to_free, cold);
for (i = 0; i < nr; i++) {
struct page *page = pages[i];
@@ -617,22 +617,15 @@ void release_pages(struct page **pages, int nr, int cold)
}
VM_BUG_ON(!PageLRU(page));
__ClearPageLRU(page);
- del_page_from_lru(zone, page);
+ del_page_from_lru_list(zone, page, page_off_lru(page));
}
- if (!pagevec_add(&pages_to_free, page)) {
- if (zone) {
- spin_unlock_irqrestore(&zone->lru_lock, flags);
- zone = NULL;
- }
- __pagevec_free(&pages_to_free);
- pagevec_reinit(&pages_to_free);
- }
+ list_add(&page->lru, &pages_to_free);
}
if (zone)
spin_unlock_irqrestore(&zone->lru_lock, flags);
- pagevec_free(&pages_to_free);
+ free_hot_cold_page_list(&pages_to_free, cold);
}
EXPORT_SYMBOL(release_pages);
@@ -652,9 +645,9 @@ void __pagevec_release(struct pagevec *pvec)
release_pages(pvec->pages, pagevec_count(pvec), pvec->cold);
pagevec_reinit(pvec);
}
-
EXPORT_SYMBOL(__pagevec_release);
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/* used by __split_huge_page_refcount() */
void lru_add_page_tail(struct zone* zone,
struct page *page, struct page *page_tail)
@@ -662,7 +655,6 @@ void lru_add_page_tail(struct zone* zone,
int active;
enum lru_list lru;
const int file = 0;
- struct list_head *head;
VM_BUG_ON(!PageHead(page));
VM_BUG_ON(PageCompound(page_tail));
@@ -681,18 +673,30 @@ void lru_add_page_tail(struct zone* zone,
lru = LRU_INACTIVE_ANON;
}
update_page_reclaim_stat(zone, page_tail, file, active);
- if (likely(PageLRU(page)))
- head = page->lru.prev;
- else
- head = &zone->lru[lru].list;
- __add_page_to_lru_list(zone, page_tail, lru, head);
} else {
SetPageUnevictable(page_tail);
- add_page_to_lru_list(zone, page_tail, LRU_UNEVICTABLE);
+ lru = LRU_UNEVICTABLE;
+ }
+
+ if (likely(PageLRU(page)))
+ list_add_tail(&page_tail->lru, &page->lru);
+ else {
+ struct list_head *list_head;
+ /*
+ * Head page has not yet been counted, as an hpage,
+ * so we must account for each subpage individually.
+ *
+ * Use the standard add function to put page_tail on the list,
+ * but then correct its position so they all end up in order.
+ */
+ add_page_to_lru_list(zone, page_tail, lru);
+ list_head = page_tail->lru.prev;
+ list_move_tail(&page_tail->lru, list_head);
}
}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-static void ____pagevec_lru_add_fn(struct page *page, void *arg)
+static void __pagevec_lru_add_fn(struct page *page, void *arg)
{
enum lru_list lru = (enum lru_list)arg;
struct zone *zone = page_zone(page);
@@ -714,32 +718,13 @@ static void ____pagevec_lru_add_fn(struct page *page, void *arg)
* Add the passed pages to the LRU, then drop the caller's refcount
* on them. Reinitialises the caller's pagevec.
*/
-void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru)
+void __pagevec_lru_add(struct pagevec *pvec, enum lru_list lru)
{
VM_BUG_ON(is_unevictable_lru(lru));
- pagevec_lru_move_fn(pvec, ____pagevec_lru_add_fn, (void *)lru);
-}
-
-EXPORT_SYMBOL(____pagevec_lru_add);
-
-/*
- * Try to drop buffers from the pages in a pagevec
- */
-void pagevec_strip(struct pagevec *pvec)
-{
- int i;
-
- for (i = 0; i < pagevec_count(pvec); i++) {
- struct page *page = pvec->pages[i];
-
- if (page_has_private(page) && trylock_page(page)) {
- if (page_has_private(page))
- try_to_release_page(page, 0);
- unlock_page(page);
- }
- }
+ pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn, (void *)lru);
}
+EXPORT_SYMBOL(__pagevec_lru_add);
/**
* pagevec_lookup - gang pagecache lookup
@@ -763,7 +748,6 @@ unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
pvec->nr = find_get_pages(mapping, start, nr_pages, pvec->pages);
return pagevec_count(pvec);
}
-
EXPORT_SYMBOL(pagevec_lookup);
unsigned pagevec_lookup_tag(struct pagevec *pvec, struct address_space *mapping,
@@ -773,7 +757,6 @@ unsigned pagevec_lookup_tag(struct pagevec *pvec, struct address_space *mapping,
nr_pages, pvec->pages);
return pagevec_count(pvec);
}
-
EXPORT_SYMBOL(pagevec_lookup_tag);
/*
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 78cc4d1f6cce..470038a91873 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -13,7 +13,6 @@
#include <linux/swapops.h>
#include <linux/init.h>
#include <linux/pagemap.h>
-#include <linux/buffer_head.h>
#include <linux/backing-dev.h>
#include <linux/pagevec.h>
#include <linux/migrate.h>
@@ -301,6 +300,16 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
new_page = alloc_page_vma(gfp_mask, vma, addr);
if (!new_page)
break; /* Out of memory */
+ /*
+ * The memcg-specific accounting when moving
+ * pages around the LRU lists relies on the
+ * page's owner (memcg) to be valid. Usually,
+ * pages are assigned to a new owner before
+ * being put on the LRU list, but since this
+ * is not the case here, the stale owner from
+ * a previous allocation cycle must be reset.
+ */
+ mem_cgroup_reset_owner(new_page);
}
/*
diff --git a/mm/swapfile.c b/mm/swapfile.c
index b1cd12060723..d999f090dfda 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -667,10 +667,10 @@ int try_to_free_swap(struct page *page)
* original page might be freed under memory pressure, then
* later read back in from swap, now with the wrong data.
*
- * Hibernation clears bits from gfp_allowed_mask to prevent
- * memory reclaim from writing to disk, so check that here.
+ * Hibration suspends storage while it is writing the image
+ * to disk so check that here.
*/
- if (!(gfp_allowed_mask & __GFP_IO))
+ if (pm_suspended_storage())
return 0;
delete_from_swap_cache(page);
@@ -847,12 +847,13 @@ unsigned int count_swap_pages(int type, int free)
static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, swp_entry_t entry, struct page *page)
{
- struct mem_cgroup *ptr;
+ struct mem_cgroup *memcg;
spinlock_t *ptl;
pte_t *pte;
int ret = 1;
- if (mem_cgroup_try_charge_swapin(vma->vm_mm, page, GFP_KERNEL, &ptr)) {
+ if (mem_cgroup_try_charge_swapin(vma->vm_mm, page,
+ GFP_KERNEL, &memcg)) {
ret = -ENOMEM;
goto out_nolock;
}
@@ -860,7 +861,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
if (unlikely(!pte_same(*pte, swp_entry_to_pte(entry)))) {
if (ret > 0)
- mem_cgroup_cancel_charge_swapin(ptr);
+ mem_cgroup_cancel_charge_swapin(memcg);
ret = 0;
goto out;
}
@@ -871,7 +872,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
set_pte_at(vma->vm_mm, addr, pte,
pte_mkold(mk_pte(page, vma->vm_page_prot)));
page_add_anon_rmap(page, vma, addr);
- mem_cgroup_commit_charge_swapin(page, ptr);
+ mem_cgroup_commit_charge_swapin(page, memcg);
swap_free(entry);
/*
* Move the page to the active list so it is not
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 1d8b32f07139..86ce9a526c17 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -256,7 +256,7 @@ struct vmap_area {
struct rb_node rb_node; /* address sorted rbtree */
struct list_head list; /* address sorted list */
struct list_head purge_list; /* "lazy purge" list */
- void *private;
+ struct vm_struct *vm;
struct rcu_head rcu_head;
};
@@ -1118,6 +1118,32 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t pro
EXPORT_SYMBOL(vm_map_ram);
/**
+ * vm_area_add_early - add vmap area early during boot
+ * @vm: vm_struct to add
+ *
+ * This function is used to add fixed kernel vm area to vmlist before
+ * vmalloc_init() is called. @vm->addr, @vm->size, and @vm->flags
+ * should contain proper values and the other fields should be zero.
+ *
+ * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
+ */
+void __init vm_area_add_early(struct vm_struct *vm)
+{
+ struct vm_struct *tmp, **p;
+
+ BUG_ON(vmap_initialized);
+ for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) {
+ if (tmp->addr >= vm->addr) {
+ BUG_ON(tmp->addr < vm->addr + vm->size);
+ break;
+ } else
+ BUG_ON(tmp->addr + tmp->size > vm->addr);
+ }
+ vm->next = *p;
+ *p = vm;
+}
+
+/**
* vm_area_register_early - register vmap area early during boot
* @vm: vm_struct to register
* @align: requested alignment
@@ -1139,8 +1165,7 @@ void __init vm_area_register_early(struct vm_struct *vm, size_t align)
vm->addr = (void *)addr;
- vm->next = vmlist;
- vmlist = vm;
+ vm_area_add_early(vm);
}
void __init vmalloc_init(void)
@@ -1260,7 +1285,7 @@ static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
vm->addr = (void *)va->va_start;
vm->size = va->va_end - va->va_start;
vm->caller = caller;
- va->private = vm;
+ va->vm = vm;
va->flags |= VM_VM_AREA;
}
@@ -1290,7 +1315,7 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
unsigned long align, unsigned long flags, unsigned long start,
unsigned long end, int node, gfp_t gfp_mask, void *caller)
{
- static struct vmap_area *va;
+ struct vmap_area *va;
struct vm_struct *area;
BUG_ON(in_interrupt());
@@ -1383,7 +1408,7 @@ static struct vm_struct *find_vm_area(const void *addr)
va = find_vmap_area((unsigned long)addr);
if (va && va->flags & VM_VM_AREA)
- return va->private;
+ return va->vm;
return NULL;
}
@@ -1402,7 +1427,7 @@ struct vm_struct *remove_vm_area(const void *addr)
va = find_vmap_area((unsigned long)addr);
if (va && va->flags & VM_VM_AREA) {
- struct vm_struct *vm = va->private;
+ struct vm_struct *vm = va->vm;
if (!(vm->flags & VM_UNLIST)) {
struct vm_struct *tmp, **p;
@@ -2353,7 +2378,7 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
vms = kzalloc(sizeof(vms[0]) * nr_vms, GFP_KERNEL);
vas = kzalloc(sizeof(vas[0]) * nr_vms, GFP_KERNEL);
if (!vas || !vms)
- goto err_free;
+ goto err_free2;
for (area = 0; area < nr_vms; area++) {
vas[area] = kzalloc(sizeof(struct vmap_area), GFP_KERNEL);
@@ -2451,11 +2476,10 @@ found:
err_free:
for (area = 0; area < nr_vms; area++) {
- if (vas)
- kfree(vas[area]);
- if (vms)
- kfree(vms[area]);
+ kfree(vas[area]);
+ kfree(vms[area]);
}
+err_free2:
kfree(vas);
kfree(vms);
return NULL;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f54a05b7a61d..2880396f7953 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -103,8 +103,11 @@ struct scan_control {
*/
reclaim_mode_t reclaim_mode;
- /* Which cgroup do we reclaim from */
- struct mem_cgroup *mem_cgroup;
+ /*
+ * The memory cgroup that hit its limit and as a result is the
+ * primary target of this reclaim invocation.
+ */
+ struct mem_cgroup *target_mem_cgroup;
/*
* Nodemask of nodes allowed by the caller. If NULL, all nodes
@@ -113,6 +116,11 @@ struct scan_control {
nodemask_t *nodemask;
};
+struct mem_cgroup_zone {
+ struct mem_cgroup *mem_cgroup;
+ struct zone *zone;
+};
+
#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
#ifdef ARCH_HAS_PREFETCH
@@ -153,28 +161,45 @@ static LIST_HEAD(shrinker_list);
static DECLARE_RWSEM(shrinker_rwsem);
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-#define scanning_global_lru(sc) (!(sc)->mem_cgroup)
+static bool global_reclaim(struct scan_control *sc)
+{
+ return !sc->target_mem_cgroup;
+}
+
+static bool scanning_global_lru(struct mem_cgroup_zone *mz)
+{
+ return !mz->mem_cgroup;
+}
#else
-#define scanning_global_lru(sc) (1)
+static bool global_reclaim(struct scan_control *sc)
+{
+ return true;
+}
+
+static bool scanning_global_lru(struct mem_cgroup_zone *mz)
+{
+ return true;
+}
#endif
-static struct zone_reclaim_stat *get_reclaim_stat(struct zone *zone,
- struct scan_control *sc)
+static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz)
{
- if (!scanning_global_lru(sc))
- return mem_cgroup_get_reclaim_stat(sc->mem_cgroup, zone);
+ if (!scanning_global_lru(mz))
+ return mem_cgroup_get_reclaim_stat(mz->mem_cgroup, mz->zone);
- return &zone->reclaim_stat;
+ return &mz->zone->reclaim_stat;
}
-static unsigned long zone_nr_lru_pages(struct zone *zone,
- struct scan_control *sc, enum lru_list lru)
+static unsigned long zone_nr_lru_pages(struct mem_cgroup_zone *mz,
+ enum lru_list lru)
{
- if (!scanning_global_lru(sc))
- return mem_cgroup_zone_nr_lru_pages(sc->mem_cgroup,
- zone_to_nid(zone), zone_idx(zone), BIT(lru));
+ if (!scanning_global_lru(mz))
+ return mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup,
+ zone_to_nid(mz->zone),
+ zone_idx(mz->zone),
+ BIT(lru));
- return zone_page_state(zone, NR_LRU_BASE + lru);
+ return zone_page_state(mz->zone, NR_LRU_BASE + lru);
}
@@ -677,12 +702,13 @@ enum page_references {
};
static enum page_references page_check_references(struct page *page,
+ struct mem_cgroup_zone *mz,
struct scan_control *sc)
{
int referenced_ptes, referenced_page;
unsigned long vm_flags;
- referenced_ptes = page_referenced(page, 1, sc->mem_cgroup, &vm_flags);
+ referenced_ptes = page_referenced(page, 1, mz->mem_cgroup, &vm_flags);
referenced_page = TestClearPageReferenced(page);
/* Lumpy reclaim - ignore references */
@@ -715,7 +741,13 @@ static enum page_references page_check_references(struct page *page,
*/
SetPageReferenced(page);
- if (referenced_page)
+ if (referenced_page || referenced_ptes > 1)
+ return PAGEREF_ACTIVATE;
+
+ /*
+ * Activate file-backed executable pages after first usage.
+ */
+ if (vm_flags & VM_EXEC)
return PAGEREF_ACTIVATE;
return PAGEREF_KEEP;
@@ -728,29 +760,11 @@ static enum page_references page_check_references(struct page *page,
return PAGEREF_RECLAIM;
}
-static noinline_for_stack void free_page_list(struct list_head *free_pages)
-{
- struct pagevec freed_pvec;
- struct page *page, *tmp;
-
- pagevec_init(&freed_pvec, 1);
-
- list_for_each_entry_safe(page, tmp, free_pages, lru) {
- list_del(&page->lru);
- if (!pagevec_add(&freed_pvec, page)) {
- __pagevec_free(&freed_pvec);
- pagevec_reinit(&freed_pvec);
- }
- }
-
- pagevec_free(&freed_pvec);
-}
-
/*
* shrink_page_list() returns the number of reclaimed pages
*/
static unsigned long shrink_page_list(struct list_head *page_list,
- struct zone *zone,
+ struct mem_cgroup_zone *mz,
struct scan_control *sc,
int priority,
unsigned long *ret_nr_dirty,
@@ -781,7 +795,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
goto keep;
VM_BUG_ON(PageActive(page));
- VM_BUG_ON(page_zone(page) != zone);
+ VM_BUG_ON(page_zone(page) != mz->zone);
sc->nr_scanned++;
@@ -815,7 +829,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
}
}
- references = page_check_references(page, sc);
+ references = page_check_references(page, mz, sc);
switch (references) {
case PAGEREF_ACTIVATE:
goto activate_locked;
@@ -1006,10 +1020,10 @@ keep_lumpy:
* back off and wait for congestion to clear because further reclaim
* will encounter the same problem
*/
- if (nr_dirty && nr_dirty == nr_congested && scanning_global_lru(sc))
- zone_set_flag(zone, ZONE_CONGESTED);
+ if (nr_dirty && nr_dirty == nr_congested && global_reclaim(sc))
+ zone_set_flag(mz->zone, ZONE_CONGESTED);
- free_page_list(&free_pages);
+ free_hot_cold_page_list(&free_pages, 1);
list_splice(&ret_pages, page_list);
count_vm_events(PGACTIVATE, pgactivate);
@@ -1061,8 +1075,39 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
ret = -EBUSY;
- if ((mode & ISOLATE_CLEAN) && (PageDirty(page) || PageWriteback(page)))
- return ret;
+ /*
+ * To minimise LRU disruption, the caller can indicate that it only
+ * wants to isolate pages it will be able to operate on without
+ * blocking - clean pages for the most part.
+ *
+ * ISOLATE_CLEAN means that only clean pages should be isolated. This
+ * is used by reclaim when it is cannot write to backing storage
+ *
+ * ISOLATE_ASYNC_MIGRATE is used to indicate that it only wants to pages
+ * that it is possible to migrate without blocking
+ */
+ if (mode & (ISOLATE_CLEAN|ISOLATE_ASYNC_MIGRATE)) {
+ /* All the caller can do on PageWriteback is block */
+ if (PageWriteback(page))
+ return ret;
+
+ if (PageDirty(page)) {
+ struct address_space *mapping;
+
+ /* ISOLATE_CLEAN means only clean pages */
+ if (mode & ISOLATE_CLEAN)
+ return ret;
+
+ /*
+ * Only pages without mappings or that have a
+ * ->migratepage callback are possible to migrate
+ * without blocking
+ */
+ mapping = page_mapping(page);
+ if (mapping && !mapping->a_ops->migratepage)
+ return ret;
+ }
+ }
if ((mode & ISOLATE_UNMAPPED) && page_mapped(page))
return ret;
@@ -1091,25 +1136,36 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
* Appropriate locks must be held before calling this function.
*
* @nr_to_scan: The number of pages to look through on the list.
- * @src: The LRU list to pull pages off.
+ * @mz: The mem_cgroup_zone to pull pages from.
* @dst: The temp list to put pages on to.
- * @scanned: The number of pages that were scanned.
+ * @nr_scanned: The number of pages that were scanned.
* @order: The caller's attempted allocation order
* @mode: One of the LRU isolation modes
+ * @active: True [1] if isolating active pages
* @file: True [1] if isolating file [!anon] pages
*
* returns how many pages were moved onto *@dst.
*/
static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
- struct list_head *src, struct list_head *dst,
- unsigned long *scanned, int order, isolate_mode_t mode,
- int file)
+ struct mem_cgroup_zone *mz, struct list_head *dst,
+ unsigned long *nr_scanned, int order, isolate_mode_t mode,
+ int active, int file)
{
+ struct lruvec *lruvec;
+ struct list_head *src;
unsigned long nr_taken = 0;
unsigned long nr_lumpy_taken = 0;
unsigned long nr_lumpy_dirty = 0;
unsigned long nr_lumpy_failed = 0;
unsigned long scan;
+ int lru = LRU_BASE;
+
+ lruvec = mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup);
+ if (active)
+ lru += LRU_ACTIVE;
+ if (file)
+ lru += LRU_FILE;
+ src = &lruvec->lists[lru];
for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
struct page *page;
@@ -1125,15 +1181,14 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
switch (__isolate_lru_page(page, mode, file)) {
case 0:
+ mem_cgroup_lru_del(page);
list_move(&page->lru, dst);
- mem_cgroup_del_lru(page);
nr_taken += hpage_nr_pages(page);
break;
case -EBUSY:
/* else it is being freed elsewhere */
list_move(&page->lru, src);
- mem_cgroup_rotate_lru_list(page, page_lru(page));
continue;
default:
@@ -1178,18 +1233,22 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
* anon page which don't already have a swap slot is
* pointless.
*/
- if (nr_swap_pages <= 0 && PageAnon(cursor_page) &&
+ if (nr_swap_pages <= 0 && PageSwapBacked(cursor_page) &&
!PageSwapCache(cursor_page))
break;
if (__isolate_lru_page(cursor_page, mode, file) == 0) {
+ unsigned int isolated_pages;
+
+ mem_cgroup_lru_del(cursor_page);
list_move(&cursor_page->lru, dst);
- mem_cgroup_del_lru(cursor_page);
- nr_taken += hpage_nr_pages(page);
- nr_lumpy_taken++;
+ isolated_pages = hpage_nr_pages(cursor_page);
+ nr_taken += isolated_pages;
+ nr_lumpy_taken += isolated_pages;
if (PageDirty(cursor_page))
- nr_lumpy_dirty++;
+ nr_lumpy_dirty += isolated_pages;
scan++;
+ pfn += isolated_pages - 1;
} else {
/*
* Check if the page is freed already.
@@ -1215,57 +1274,16 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
nr_lumpy_failed++;
}
- *scanned = scan;
+ *nr_scanned = scan;
trace_mm_vmscan_lru_isolate(order,
nr_to_scan, scan,
nr_taken,
nr_lumpy_taken, nr_lumpy_dirty, nr_lumpy_failed,
- mode);
+ mode, file);
return nr_taken;
}
-static unsigned long isolate_pages_global(unsigned long nr,
- struct list_head *dst,
- unsigned long *scanned, int order,
- isolate_mode_t mode,
- struct zone *z, int active, int file)
-{
- int lru = LRU_BASE;
- if (active)
- lru += LRU_ACTIVE;
- if (file)
- lru += LRU_FILE;
- return isolate_lru_pages(nr, &z->lru[lru].list, dst, scanned, order,
- mode, file);
-}
-
-/*
- * clear_active_flags() is a helper for shrink_active_list(), clearing
- * any active bits from the pages in the list.
- */
-static unsigned long clear_active_flags(struct list_head *page_list,
- unsigned int *count)
-{
- int nr_active = 0;
- int lru;
- struct page *page;
-
- list_for_each_entry(page, page_list, lru) {
- int numpages = hpage_nr_pages(page);
- lru = page_lru_base_type(page);
- if (PageActive(page)) {
- lru += LRU_ACTIVE;
- ClearPageActive(page);
- nr_active += numpages;
- }
- if (count)
- count[lru] += numpages;
- }
-
- return nr_active;
-}
-
/**
* isolate_lru_page - tries to isolate a page from its LRU list
* @page: page to isolate from its LRU list
@@ -1325,7 +1343,7 @@ static int too_many_isolated(struct zone *zone, int file,
if (current_is_kswapd())
return 0;
- if (!scanning_global_lru(sc))
+ if (!global_reclaim(sc))
return 0;
if (file) {
@@ -1339,27 +1357,21 @@ static int too_many_isolated(struct zone *zone, int file,
return isolated > inactive;
}
-/*
- * TODO: Try merging with migrations version of putback_lru_pages
- */
static noinline_for_stack void
-putback_lru_pages(struct zone *zone, struct scan_control *sc,
- unsigned long nr_anon, unsigned long nr_file,
- struct list_head *page_list)
+putback_inactive_pages(struct mem_cgroup_zone *mz,
+ struct list_head *page_list)
{
- struct page *page;
- struct pagevec pvec;
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
-
- pagevec_init(&pvec, 1);
+ struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
+ struct zone *zone = mz->zone;
+ LIST_HEAD(pages_to_free);
/*
* Put back any unfreeable pages.
*/
- spin_lock(&zone->lru_lock);
while (!list_empty(page_list)) {
+ struct page *page = lru_to_page(page_list);
int lru;
- page = lru_to_page(page_list);
+
VM_BUG_ON(PageLRU(page));
list_del(&page->lru);
if (unlikely(!page_evictable(page, NULL))) {
@@ -1376,30 +1388,53 @@ putback_lru_pages(struct zone *zone, struct scan_control *sc,
int numpages = hpage_nr_pages(page);
reclaim_stat->recent_rotated[file] += numpages;
}
- if (!pagevec_add(&pvec, page)) {
- spin_unlock_irq(&zone->lru_lock);
- __pagevec_release(&pvec);
- spin_lock_irq(&zone->lru_lock);
+ if (put_page_testzero(page)) {
+ __ClearPageLRU(page);
+ __ClearPageActive(page);
+ del_page_from_lru_list(zone, page, lru);
+
+ if (unlikely(PageCompound(page))) {
+ spin_unlock_irq(&zone->lru_lock);
+ (*get_compound_page_dtor(page))(page);
+ spin_lock_irq(&zone->lru_lock);
+ } else
+ list_add(&page->lru, &pages_to_free);
}
}
- __mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
- __mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
- spin_unlock_irq(&zone->lru_lock);
- pagevec_release(&pvec);
+ /*
+ * To save our caller's stack, now use input list for pages to free.
+ */
+ list_splice(&pages_to_free, page_list);
}
-static noinline_for_stack void update_isolated_counts(struct zone *zone,
- struct scan_control *sc,
- unsigned long *nr_anon,
- unsigned long *nr_file,
- struct list_head *isolated_list)
+static noinline_for_stack void
+update_isolated_counts(struct mem_cgroup_zone *mz,
+ struct list_head *page_list,
+ unsigned long *nr_anon,
+ unsigned long *nr_file)
{
- unsigned long nr_active;
+ struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
+ struct zone *zone = mz->zone;
unsigned int count[NR_LRU_LISTS] = { 0, };
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
+ unsigned long nr_active = 0;
+ struct page *page;
+ int lru;
+
+ /*
+ * Count pages and clear active flags
+ */
+ list_for_each_entry(page, page_list, lru) {
+ int numpages = hpage_nr_pages(page);
+ lru = page_lru_base_type(page);
+ if (PageActive(page)) {
+ lru += LRU_ACTIVE;
+ ClearPageActive(page);
+ nr_active += numpages;
+ }
+ count[lru] += numpages;
+ }
- nr_active = clear_active_flags(isolated_list, count);
__count_vm_events(PGDEACTIVATE, nr_active);
__mod_zone_page_state(zone, NR_ACTIVE_FILE,
@@ -1413,8 +1448,6 @@ static noinline_for_stack void update_isolated_counts(struct zone *zone,
*nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
*nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
- __mod_zone_page_state(zone, NR_ISOLATED_ANON, *nr_anon);
- __mod_zone_page_state(zone, NR_ISOLATED_FILE, *nr_file);
reclaim_stat->recent_scanned[0] += *nr_anon;
reclaim_stat->recent_scanned[1] += *nr_file;
@@ -1466,8 +1499,8 @@ static inline bool should_reclaim_stall(unsigned long nr_taken,
* of reclaimed pages
*/
static noinline_for_stack unsigned long
-shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
- struct scan_control *sc, int priority, int file)
+shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
+ struct scan_control *sc, int priority, int file)
{
LIST_HEAD(page_list);
unsigned long nr_scanned;
@@ -1478,6 +1511,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
unsigned long nr_dirty = 0;
unsigned long nr_writeback = 0;
isolate_mode_t reclaim_mode = ISOLATE_INACTIVE;
+ struct zone *zone = mz->zone;
while (unlikely(too_many_isolated(zone, file, sc))) {
congestion_wait(BLK_RW_ASYNC, HZ/10);
@@ -1500,9 +1534,10 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
spin_lock_irq(&zone->lru_lock);
- if (scanning_global_lru(sc)) {
- nr_taken = isolate_pages_global(nr_to_scan, &page_list,
- &nr_scanned, sc->order, reclaim_mode, zone, 0, file);
+ nr_taken = isolate_lru_pages(nr_to_scan, mz, &page_list,
+ &nr_scanned, sc->order,
+ reclaim_mode, 0, file);
+ if (global_reclaim(sc)) {
zone->pages_scanned += nr_scanned;
if (current_is_kswapd())
__count_zone_vm_events(PGSCAN_KSWAPD, zone,
@@ -1510,14 +1545,6 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
else
__count_zone_vm_events(PGSCAN_DIRECT, zone,
nr_scanned);
- } else {
- nr_taken = mem_cgroup_isolate_pages(nr_to_scan, &page_list,
- &nr_scanned, sc->order, reclaim_mode, zone,
- sc->mem_cgroup, 0, file);
- /*
- * mem_cgroup_isolate_pages() keeps track of
- * scanned pages on its own.
- */
}
if (nr_taken == 0) {
@@ -1525,26 +1552,37 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
return 0;
}
- update_isolated_counts(zone, sc, &nr_anon, &nr_file, &page_list);
+ update_isolated_counts(mz, &page_list, &nr_anon, &nr_file);
+
+ __mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon);
+ __mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file);
spin_unlock_irq(&zone->lru_lock);
- nr_reclaimed = shrink_page_list(&page_list, zone, sc, priority,
+ nr_reclaimed = shrink_page_list(&page_list, mz, sc, priority,
&nr_dirty, &nr_writeback);
/* Check if we should syncronously wait for writeback */
if (should_reclaim_stall(nr_taken, nr_reclaimed, priority, sc)) {
set_reclaim_mode(priority, sc, true);
- nr_reclaimed += shrink_page_list(&page_list, zone, sc,
+ nr_reclaimed += shrink_page_list(&page_list, mz, sc,
priority, &nr_dirty, &nr_writeback);
}
- local_irq_disable();
+ spin_lock_irq(&zone->lru_lock);
+
if (current_is_kswapd())
__count_vm_events(KSWAPD_STEAL, nr_reclaimed);
__count_zone_vm_events(PGSTEAL, zone, nr_reclaimed);
- putback_lru_pages(zone, sc, nr_anon, nr_file, &page_list);
+ putback_inactive_pages(mz, &page_list);
+
+ __mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
+ __mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
+
+ spin_unlock_irq(&zone->lru_lock);
+
+ free_hot_cold_page_list(&page_list, 1);
/*
* If reclaim is isolating dirty pages under writeback, it implies
@@ -1600,30 +1638,47 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
static void move_active_pages_to_lru(struct zone *zone,
struct list_head *list,
+ struct list_head *pages_to_free,
enum lru_list lru)
{
unsigned long pgmoved = 0;
- struct pagevec pvec;
struct page *page;
- pagevec_init(&pvec, 1);
+ if (buffer_heads_over_limit) {
+ spin_unlock_irq(&zone->lru_lock);
+ list_for_each_entry(page, list, lru) {
+ if (page_has_private(page) && trylock_page(page)) {
+ if (page_has_private(page))
+ try_to_release_page(page, 0);
+ unlock_page(page);
+ }
+ }
+ spin_lock_irq(&zone->lru_lock);
+ }
while (!list_empty(list)) {
+ struct lruvec *lruvec;
+
page = lru_to_page(list);
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);
- list_move(&page->lru, &zone->lru[lru].list);
- mem_cgroup_add_lru_list(page, lru);
+ lruvec = mem_cgroup_lru_add_list(zone, page, lru);
+ list_move(&page->lru, &lruvec->lists[lru]);
pgmoved += hpage_nr_pages(page);
- if (!pagevec_add(&pvec, page) || list_empty(list)) {
- spin_unlock_irq(&zone->lru_lock);
- if (buffer_heads_over_limit)
- pagevec_strip(&pvec);
- __pagevec_release(&pvec);
- spin_lock_irq(&zone->lru_lock);
+ if (put_page_testzero(page)) {
+ __ClearPageLRU(page);
+ __ClearPageActive(page);
+ del_page_from_lru_list(zone, page, lru);
+
+ if (unlikely(PageCompound(page))) {
+ spin_unlock_irq(&zone->lru_lock);
+ (*get_compound_page_dtor(page))(page);
+ spin_lock_irq(&zone->lru_lock);
+ } else
+ list_add(&page->lru, pages_to_free);
}
}
__mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved);
@@ -1631,19 +1686,22 @@ static void move_active_pages_to_lru(struct zone *zone,
__count_vm_events(PGDEACTIVATE, pgmoved);
}
-static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
- struct scan_control *sc, int priority, int file)
+static void shrink_active_list(unsigned long nr_to_scan,
+ struct mem_cgroup_zone *mz,
+ struct scan_control *sc,
+ int priority, int file)
{
unsigned long nr_taken;
- unsigned long pgscanned;
+ unsigned long nr_scanned;
unsigned long vm_flags;
LIST_HEAD(l_hold); /* The pages which were snipped off */
LIST_HEAD(l_active);
LIST_HEAD(l_inactive);
struct page *page;
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
+ struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
unsigned long nr_rotated = 0;
isolate_mode_t reclaim_mode = ISOLATE_ACTIVE;
+ struct zone *zone = mz->zone;
lru_add_drain();
@@ -1653,26 +1711,16 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
reclaim_mode |= ISOLATE_CLEAN;
spin_lock_irq(&zone->lru_lock);
- if (scanning_global_lru(sc)) {
- nr_taken = isolate_pages_global(nr_pages, &l_hold,
- &pgscanned, sc->order,
- reclaim_mode, zone,
- 1, file);
- zone->pages_scanned += pgscanned;
- } else {
- nr_taken = mem_cgroup_isolate_pages(nr_pages, &l_hold,
- &pgscanned, sc->order,
- reclaim_mode, zone,
- sc->mem_cgroup, 1, file);
- /*
- * mem_cgroup_isolate_pages() keeps track of
- * scanned pages on its own.
- */
- }
+
+ nr_taken = isolate_lru_pages(nr_to_scan, mz, &l_hold,
+ &nr_scanned, sc->order,
+ reclaim_mode, 1, file);
+ if (global_reclaim(sc))
+ zone->pages_scanned += nr_scanned;
reclaim_stat->recent_scanned[file] += nr_taken;
- __count_zone_vm_events(PGREFILL, zone, pgscanned);
+ __count_zone_vm_events(PGREFILL, zone, nr_scanned);
if (file)
__mod_zone_page_state(zone, NR_ACTIVE_FILE, -nr_taken);
else
@@ -1690,7 +1738,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
continue;
}
- if (page_referenced(page, 0, sc->mem_cgroup, &vm_flags)) {
+ if (page_referenced(page, 0, mz->mem_cgroup, &vm_flags)) {
nr_rotated += hpage_nr_pages(page);
/*
* Identify referenced, file-backed active pages and
@@ -1723,12 +1771,14 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
*/
reclaim_stat->recent_rotated[file] += nr_rotated;
- move_active_pages_to_lru(zone, &l_active,
+ move_active_pages_to_lru(zone, &l_active, &l_hold,
LRU_ACTIVE + file * LRU_FILE);
- move_active_pages_to_lru(zone, &l_inactive,
+ move_active_pages_to_lru(zone, &l_inactive, &l_hold,
LRU_BASE + file * LRU_FILE);
__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
spin_unlock_irq(&zone->lru_lock);
+
+ free_hot_cold_page_list(&l_hold, 1);
}
#ifdef CONFIG_SWAP
@@ -1753,10 +1803,8 @@ static int inactive_anon_is_low_global(struct zone *zone)
* Returns true if the zone does not have enough inactive anon pages,
* meaning some active anon pages need to be deactivated.
*/
-static int inactive_anon_is_low(struct zone *zone, struct scan_control *sc)
+static int inactive_anon_is_low(struct mem_cgroup_zone *mz)
{
- int low;
-
/*
* If we don't have swap space, anonymous page deactivation
* is pointless.
@@ -1764,15 +1812,14 @@ static int inactive_anon_is_low(struct zone *zone, struct scan_control *sc)
if (!total_swap_pages)
return 0;
- if (scanning_global_lru(sc))
- low = inactive_anon_is_low_global(zone);
- else
- low = mem_cgroup_inactive_anon_is_low(sc->mem_cgroup, zone);
- return low;
+ if (!scanning_global_lru(mz))
+ return mem_cgroup_inactive_anon_is_low(mz->mem_cgroup,
+ mz->zone);
+
+ return inactive_anon_is_low_global(mz->zone);
}
#else
-static inline int inactive_anon_is_low(struct zone *zone,
- struct scan_control *sc)
+static inline int inactive_anon_is_low(struct mem_cgroup_zone *mz)
{
return 0;
}
@@ -1790,8 +1837,7 @@ static int inactive_file_is_low_global(struct zone *zone)
/**
* inactive_file_is_low - check if file pages need to be deactivated
- * @zone: zone to check
- * @sc: scan control of this context
+ * @mz: memory cgroup and zone to check
*
* When the system is doing streaming IO, memory pressure here
* ensures that active file pages get deactivated, until more
@@ -1803,45 +1849,44 @@ static int inactive_file_is_low_global(struct zone *zone)
* This uses a different ratio than the anonymous pages, because
* the page cache uses a use-once replacement algorithm.
*/
-static int inactive_file_is_low(struct zone *zone, struct scan_control *sc)
+static int inactive_file_is_low(struct mem_cgroup_zone *mz)
{
- int low;
+ if (!scanning_global_lru(mz))
+ return mem_cgroup_inactive_file_is_low(mz->mem_cgroup,
+ mz->zone);
- if (scanning_global_lru(sc))
- low = inactive_file_is_low_global(zone);
- else
- low = mem_cgroup_inactive_file_is_low(sc->mem_cgroup, zone);
- return low;
+ return inactive_file_is_low_global(mz->zone);
}
-static int inactive_list_is_low(struct zone *zone, struct scan_control *sc,
- int file)
+static int inactive_list_is_low(struct mem_cgroup_zone *mz, int file)
{
if (file)
- return inactive_file_is_low(zone, sc);
+ return inactive_file_is_low(mz);
else
- return inactive_anon_is_low(zone, sc);
+ return inactive_anon_is_low(mz);
}
static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
- struct zone *zone, struct scan_control *sc, int priority)
+ struct mem_cgroup_zone *mz,
+ struct scan_control *sc, int priority)
{
int file = is_file_lru(lru);
if (is_active_lru(lru)) {
- if (inactive_list_is_low(zone, sc, file))
- shrink_active_list(nr_to_scan, zone, sc, priority, file);
+ if (inactive_list_is_low(mz, file))
+ shrink_active_list(nr_to_scan, mz, sc, priority, file);
return 0;
}
- return shrink_inactive_list(nr_to_scan, zone, sc, priority, file);
+ return shrink_inactive_list(nr_to_scan, mz, sc, priority, file);
}
-static int vmscan_swappiness(struct scan_control *sc)
+static int vmscan_swappiness(struct mem_cgroup_zone *mz,
+ struct scan_control *sc)
{
- if (scanning_global_lru(sc))
+ if (global_reclaim(sc))
return vm_swappiness;
- return mem_cgroup_swappiness(sc->mem_cgroup);
+ return mem_cgroup_swappiness(mz->mem_cgroup);
}
/*
@@ -1852,15 +1897,15 @@ static int vmscan_swappiness(struct scan_control *sc)
*
* nr[0] = anon pages to scan; nr[1] = file pages to scan
*/
-static void get_scan_count(struct zone *zone, struct scan_control *sc,
- unsigned long *nr, int priority)
+static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
+ unsigned long *nr, int priority)
{
unsigned long anon, file, free;
unsigned long anon_prio, file_prio;
unsigned long ap, fp;
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
+ struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
u64 fraction[2], denominator;
- enum lru_list l;
+ enum lru_list lru;
int noswap = 0;
bool force_scan = false;
@@ -1874,9 +1919,9 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
* latencies, so it's better to scan a minimum amount there as
* well.
*/
- if (scanning_global_lru(sc) && current_is_kswapd())
+ if (current_is_kswapd() && mz->zone->all_unreclaimable)
force_scan = true;
- if (!scanning_global_lru(sc))
+ if (!global_reclaim(sc))
force_scan = true;
/* If we have no swap space, do not bother scanning anon pages. */
@@ -1888,16 +1933,16 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
goto out;
}
- anon = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_ANON) +
- zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON);
- file = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_FILE) +
- zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
+ anon = zone_nr_lru_pages(mz, LRU_ACTIVE_ANON) +
+ zone_nr_lru_pages(mz, LRU_INACTIVE_ANON);
+ file = zone_nr_lru_pages(mz, LRU_ACTIVE_FILE) +
+ zone_nr_lru_pages(mz, LRU_INACTIVE_FILE);
- if (scanning_global_lru(sc)) {
- free = zone_page_state(zone, NR_FREE_PAGES);
+ if (global_reclaim(sc)) {
+ free = zone_page_state(mz->zone, NR_FREE_PAGES);
/* If we have very few page cache pages,
force-scan anon pages. */
- if (unlikely(file + free <= high_wmark_pages(zone))) {
+ if (unlikely(file + free <= high_wmark_pages(mz->zone))) {
fraction[0] = 1;
fraction[1] = 0;
denominator = 1;
@@ -1909,8 +1954,8 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
* With swappiness at 100, anonymous and file have the same priority.
* This scanning priority is essentially the inverse of IO cost.
*/
- anon_prio = vmscan_swappiness(sc);
- file_prio = 200 - vmscan_swappiness(sc);
+ anon_prio = vmscan_swappiness(mz, sc);
+ file_prio = 200 - vmscan_swappiness(mz, sc);
/*
* OK, so we have swap space and a fair amount of page cache
@@ -1923,7 +1968,7 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
*
* anon in [0], file in [1]
*/
- spin_lock_irq(&zone->lru_lock);
+ spin_lock_irq(&mz->zone->lru_lock);
if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) {
reclaim_stat->recent_scanned[0] /= 2;
reclaim_stat->recent_rotated[0] /= 2;
@@ -1944,24 +1989,24 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
fp = (file_prio + 1) * (reclaim_stat->recent_scanned[1] + 1);
fp /= reclaim_stat->recent_rotated[1] + 1;
- spin_unlock_irq(&zone->lru_lock);
+ spin_unlock_irq(&mz->zone->lru_lock);
fraction[0] = ap;
fraction[1] = fp;
denominator = ap + fp + 1;
out:
- for_each_evictable_lru(l) {
- int file = is_file_lru(l);
+ for_each_evictable_lru(lru) {
+ int file = is_file_lru(lru);
unsigned long scan;
- scan = zone_nr_lru_pages(zone, sc, l);
+ scan = zone_nr_lru_pages(mz, lru);
if (priority || noswap) {
scan >>= priority;
if (!scan && force_scan)
scan = SWAP_CLUSTER_MAX;
scan = div64_u64(scan * fraction[file], denominator);
}
- nr[l] = scan;
+ nr[lru] = scan;
}
}
@@ -1972,7 +2017,7 @@ out:
* back to the allocator and call try_to_compact_zone(), we ensure that
* there are enough free pages for it to be likely successful
*/
-static inline bool should_continue_reclaim(struct zone *zone,
+static inline bool should_continue_reclaim(struct mem_cgroup_zone *mz,
unsigned long nr_reclaimed,
unsigned long nr_scanned,
struct scan_control *sc)
@@ -2012,14 +2057,15 @@ static inline bool should_continue_reclaim(struct zone *zone,
* inactive lists are large enough, continue reclaiming
*/
pages_for_compaction = (2UL << sc->order);
- inactive_lru_pages = zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON) +
- zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
+ inactive_lru_pages = zone_nr_lru_pages(mz, LRU_INACTIVE_FILE);
+ if (nr_swap_pages > 0)
+ inactive_lru_pages += zone_nr_lru_pages(mz, LRU_INACTIVE_ANON);
if (sc->nr_reclaimed < pages_for_compaction &&
inactive_lru_pages > pages_for_compaction)
return true;
/* If compaction would go ahead or the allocation would succeed, stop */
- switch (compaction_suitable(zone, sc->order)) {
+ switch (compaction_suitable(mz->zone, sc->order)) {
case COMPACT_PARTIAL:
case COMPACT_CONTINUE:
return false;
@@ -2031,12 +2077,12 @@ static inline bool should_continue_reclaim(struct zone *zone,
/*
* This is a basic per-zone page freer. Used by both kswapd and direct reclaim.
*/
-static void shrink_zone(int priority, struct zone *zone,
- struct scan_control *sc)
+static void shrink_mem_cgroup_zone(int priority, struct mem_cgroup_zone *mz,
+ struct scan_control *sc)
{
unsigned long nr[NR_LRU_LISTS];
unsigned long nr_to_scan;
- enum lru_list l;
+ enum lru_list lru;
unsigned long nr_reclaimed, nr_scanned;
unsigned long nr_to_reclaim = sc->nr_to_reclaim;
struct blk_plug plug;
@@ -2044,19 +2090,19 @@ static void shrink_zone(int priority, struct zone *zone,
restart:
nr_reclaimed = 0;
nr_scanned = sc->nr_scanned;
- get_scan_count(zone, sc, nr, priority);
+ get_scan_count(mz, sc, nr, priority);
blk_start_plug(&plug);
while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
nr[LRU_INACTIVE_FILE]) {
- for_each_evictable_lru(l) {
- if (nr[l]) {
+ for_each_evictable_lru(lru) {
+ if (nr[lru]) {
nr_to_scan = min_t(unsigned long,
- nr[l], SWAP_CLUSTER_MAX);
- nr[l] -= nr_to_scan;
+ nr[lru], SWAP_CLUSTER_MAX);
+ nr[lru] -= nr_to_scan;
- nr_reclaimed += shrink_list(l, nr_to_scan,
- zone, sc, priority);
+ nr_reclaimed += shrink_list(lru, nr_to_scan,
+ mz, sc, priority);
}
}
/*
@@ -2077,17 +2123,89 @@ restart:
* Even if we did not try to evict anon pages at all, we want to
* rebalance the anon lru active/inactive ratio.
*/
- if (inactive_anon_is_low(zone, sc))
- shrink_active_list(SWAP_CLUSTER_MAX, zone, sc, priority, 0);
+ if (inactive_anon_is_low(mz))
+ shrink_active_list(SWAP_CLUSTER_MAX, mz, sc, priority, 0);
/* reclaim/compaction might need reclaim to continue */
- if (should_continue_reclaim(zone, nr_reclaimed,
+ if (should_continue_reclaim(mz, nr_reclaimed,
sc->nr_scanned - nr_scanned, sc))
goto restart;
throttle_vm_writeout(sc->gfp_mask);
}
+static void shrink_zone(int priority, struct zone *zone,
+ struct scan_control *sc)
+{
+ struct mem_cgroup *root = sc->target_mem_cgroup;
+ struct mem_cgroup_reclaim_cookie reclaim = {
+ .zone = zone,
+ .priority = priority,
+ };
+ struct mem_cgroup *memcg;
+
+ memcg = mem_cgroup_iter(root, NULL, &reclaim);
+ do {
+ struct mem_cgroup_zone mz = {
+ .mem_cgroup = memcg,
+ .zone = zone,
+ };
+
+ shrink_mem_cgroup_zone(priority, &mz, sc);
+ /*
+ * Limit reclaim has historically picked one memcg and
+ * scanned it with decreasing priority levels until
+ * nr_to_reclaim had been reclaimed. This priority
+ * cycle is thus over after a single memcg.
+ *
+ * Direct reclaim and kswapd, on the other hand, have
+ * to scan all memory cgroups to fulfill the overall
+ * scan target for the zone.
+ */
+ if (!global_reclaim(sc)) {
+ mem_cgroup_iter_break(root, memcg);
+ break;
+ }
+ memcg = mem_cgroup_iter(root, memcg, &reclaim);
+ } while (memcg);
+}
+
+/* Returns true if compaction should go ahead for a high-order request */
+static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
+{
+ unsigned long balance_gap, watermark;
+ bool watermark_ok;
+
+ /* Do not consider compaction for orders reclaim is meant to satisfy */
+ if (sc->order <= PAGE_ALLOC_COSTLY_ORDER)
+ return false;
+
+ /*
+ * Compaction takes time to run and there are potentially other
+ * callers using the pages just freed. Continue reclaiming until
+ * there is a buffer of free pages available to give compaction
+ * a reasonable chance of completing and allocating the page
+ */
+ balance_gap = min(low_wmark_pages(zone),
+ (zone->present_pages + KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
+ KSWAPD_ZONE_BALANCE_GAP_RATIO);
+ watermark = high_wmark_pages(zone) + balance_gap + (2UL << sc->order);
+ watermark_ok = zone_watermark_ok_safe(zone, 0, watermark, 0, 0);
+
+ /*
+ * If compaction is deferred, reclaim up to a point where
+ * compaction will have a chance of success when re-enabled
+ */
+ if (compaction_deferred(zone))
+ return watermark_ok;
+
+ /* If compaction is not ready to start, keep reclaiming */
+ if (!compaction_suitable(zone, sc->order))
+ return false;
+
+ return watermark_ok;
+}
+
/*
* This is the direct reclaim path, for page-allocating processes. We only
* try to reclaim pages from zones which will satisfy the caller's allocation
@@ -2105,8 +2223,9 @@ restart:
* scan then give up on it.
*
* This function returns true if a zone is being reclaimed for a costly
- * high-order allocation and compaction is either ready to begin or deferred.
- * This indicates to the caller that it should retry the allocation or fail.
+ * high-order allocation and compaction is ready to begin. This indicates to
+ * the caller that it should consider retrying the allocation instead of
+ * further reclaim.
*/
static bool shrink_zones(int priority, struct zonelist *zonelist,
struct scan_control *sc)
@@ -2115,7 +2234,7 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
struct zone *zone;
unsigned long nr_soft_reclaimed;
unsigned long nr_soft_scanned;
- bool should_abort_reclaim = false;
+ bool aborted_reclaim = false;
for_each_zone_zonelist_nodemask(zone, z, zonelist,
gfp_zone(sc->gfp_mask), sc->nodemask) {
@@ -2125,7 +2244,7 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
* Take care memory controller reclaiming has small influence
* to global LRU.
*/
- if (scanning_global_lru(sc)) {
+ if (global_reclaim(sc)) {
if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
continue;
if (zone->all_unreclaimable && priority != DEF_PRIORITY)
@@ -2140,10 +2259,8 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
* noticable problem, like transparent huge page
* allocations.
*/
- if (sc->order > PAGE_ALLOC_COSTLY_ORDER &&
- (compaction_suitable(zone, sc->order) ||
- compaction_deferred(zone))) {
- should_abort_reclaim = true;
+ if (compaction_ready(zone, sc)) {
+ aborted_reclaim = true;
continue;
}
}
@@ -2165,7 +2282,7 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
shrink_zone(priority, zone, sc);
}
- return should_abort_reclaim;
+ return aborted_reclaim;
}
static bool zone_reclaimable(struct zone *zone)
@@ -2219,25 +2336,25 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
struct zoneref *z;
struct zone *zone;
unsigned long writeback_threshold;
+ bool aborted_reclaim;
get_mems_allowed();
delayacct_freepages_start();
- if (scanning_global_lru(sc))
+ if (global_reclaim(sc))
count_vm_event(ALLOCSTALL);
for (priority = DEF_PRIORITY; priority >= 0; priority--) {
sc->nr_scanned = 0;
if (!priority)
- disable_swap_token(sc->mem_cgroup);
- if (shrink_zones(priority, zonelist, sc))
- break;
+ disable_swap_token(sc->target_mem_cgroup);
+ aborted_reclaim = shrink_zones(priority, zonelist, sc);
/*
* Don't shrink slabs when reclaiming memory from
* over limit cgroups
*/
- if (scanning_global_lru(sc)) {
+ if (global_reclaim(sc)) {
unsigned long lru_pages = 0;
for_each_zone_zonelist(zone, z, zonelist,
gfp_zone(sc->gfp_mask)) {
@@ -2298,8 +2415,12 @@ out:
if (oom_killer_disabled)
return 0;
+ /* Aborted reclaim to try compaction? don't OOM, then */
+ if (aborted_reclaim)
+ return 1;
+
/* top priority shrink_zones still had more to do? don't OOM, then */
- if (scanning_global_lru(sc) && !all_unreclaimable(zonelist, sc))
+ if (global_reclaim(sc) && !all_unreclaimable(zonelist, sc))
return 1;
return 0;
@@ -2316,7 +2437,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
.may_unmap = 1,
.may_swap = 1,
.order = order,
- .mem_cgroup = NULL,
+ .target_mem_cgroup = NULL,
.nodemask = nodemask,
};
struct shrink_control shrink = {
@@ -2336,7 +2457,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
+unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
gfp_t gfp_mask, bool noswap,
struct zone *zone,
unsigned long *nr_scanned)
@@ -2348,7 +2469,11 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
.may_unmap = 1,
.may_swap = !noswap,
.order = 0,
- .mem_cgroup = mem,
+ .target_mem_cgroup = memcg,
+ };
+ struct mem_cgroup_zone mz = {
+ .mem_cgroup = memcg,
+ .zone = zone,
};
sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
@@ -2365,7 +2490,7 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
* will pick up pages from other mem cgroup's as well. We hack
* the priority and make it zero.
*/
- shrink_zone(0, zone, &sc);
+ shrink_mem_cgroup_zone(0, &mz, &sc);
trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);
@@ -2373,7 +2498,7 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
return sc.nr_reclaimed;
}
-unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
+unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
gfp_t gfp_mask,
bool noswap)
{
@@ -2386,7 +2511,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
.may_swap = !noswap,
.nr_to_reclaim = SWAP_CLUSTER_MAX,
.order = 0,
- .mem_cgroup = mem_cont,
+ .target_mem_cgroup = memcg,
.nodemask = NULL, /* we don't care the placement */
.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK),
@@ -2400,7 +2525,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
* take care of from where we get pages. So the node where we start the
* scan does not need to be the current node.
*/
- nid = mem_cgroup_select_victim_node(mem_cont);
+ nid = mem_cgroup_select_victim_node(memcg);
zonelist = NODE_DATA(nid)->node_zonelists;
@@ -2416,6 +2541,29 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
}
#endif
+static void age_active_anon(struct zone *zone, struct scan_control *sc,
+ int priority)
+{
+ struct mem_cgroup *memcg;
+
+ if (!total_swap_pages)
+ return;
+
+ memcg = mem_cgroup_iter(NULL, NULL, NULL);
+ do {
+ struct mem_cgroup_zone mz = {
+ .mem_cgroup = memcg,
+ .zone = zone,
+ };
+
+ if (inactive_anon_is_low(&mz))
+ shrink_active_list(SWAP_CLUSTER_MAX, &mz,
+ sc, priority, 0);
+
+ memcg = mem_cgroup_iter(NULL, memcg, NULL);
+ } while (memcg);
+}
+
/*
* pgdat_balanced is used when checking if a node is balanced for high-order
* allocations. Only zones that meet watermarks and are in a zone allowed
@@ -2536,7 +2684,7 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
*/
.nr_to_reclaim = ULONG_MAX,
.order = order,
- .mem_cgroup = NULL,
+ .target_mem_cgroup = NULL,
};
struct shrink_control shrink = {
.gfp_mask = sc.gfp_mask,
@@ -2575,9 +2723,7 @@ loop_again:
* Do some background aging of the anon list, to give
* pages a chance to be referenced before reclaiming.
*/
- if (inactive_anon_is_low(zone, &sc))
- shrink_active_list(SWAP_CLUSTER_MAX, zone,
- &sc, priority, 0);
+ age_active_anon(zone, &sc, priority);
if (!zone_watermark_ok_safe(zone, order,
high_wmark_pages(zone), 0, 0)) {
@@ -3366,16 +3512,18 @@ int page_evictable(struct page *page, struct vm_area_struct *vma)
*/
static void check_move_unevictable_page(struct page *page, struct zone *zone)
{
- VM_BUG_ON(PageActive(page));
+ struct lruvec *lruvec;
+ VM_BUG_ON(PageActive(page));
retry:
ClearPageUnevictable(page);
if (page_evictable(page, NULL)) {
enum lru_list l = page_lru_base_type(page);
__dec_zone_state(zone, NR_UNEVICTABLE);
- list_move(&page->lru, &zone->lru[l].list);
- mem_cgroup_move_lists(page, LRU_UNEVICTABLE, l);
+ lruvec = mem_cgroup_lru_move_lists(zone, page,
+ LRU_UNEVICTABLE, l);
+ list_move(&page->lru, &lruvec->lists[l]);
__inc_zone_state(zone, NR_INACTIVE_ANON + l);
__count_vm_event(UNEVICTABLE_PGRESCUED);
} else {
@@ -3383,8 +3531,9 @@ retry:
* rotate unevictable list
*/
SetPageUnevictable(page);
- list_move(&page->lru, &zone->lru[LRU_UNEVICTABLE].list);
- mem_cgroup_rotate_lru_list(page, LRU_UNEVICTABLE);
+ lruvec = mem_cgroup_lru_move_lists(zone, page, LRU_UNEVICTABLE,
+ LRU_UNEVICTABLE);
+ list_move(&page->lru, &lruvec->lists[LRU_UNEVICTABLE]);
if (page_evictable(page, NULL))
goto retry;
}
@@ -3448,9 +3597,10 @@ void scan_mapping_unevictable_pages(struct address_space *mapping)
static void warn_scan_unevictable_pages(void)
{
printk_once(KERN_WARNING
- "The scan_unevictable_pages sysctl/node-interface has been "
+ "%s: The scan_unevictable_pages sysctl/node-interface has been "
"disabled for lack of a legitimate use case. If you have "
- "one, please send an email to linux-mm@kvack.org.\n");
+ "one, please send an email to linux-mm@kvack.org.\n",
+ current->comm);
}
/*
@@ -3475,16 +3625,16 @@ int scan_unevictable_handler(struct ctl_table *table, int write,
* a specified node's per zone unevictable lists for evictable pages.
*/
-static ssize_t read_scan_unevictable_node(struct sys_device *dev,
- struct sysdev_attribute *attr,
+static ssize_t read_scan_unevictable_node(struct device *dev,
+ struct device_attribute *attr,
char *buf)
{
warn_scan_unevictable_pages();
return sprintf(buf, "0\n"); /* always zero; should fit... */
}
-static ssize_t write_scan_unevictable_node(struct sys_device *dev,
- struct sysdev_attribute *attr,
+static ssize_t write_scan_unevictable_node(struct device *dev,
+ struct device_attribute *attr,
const char *buf, size_t count)
{
warn_scan_unevictable_pages();
@@ -3492,17 +3642,17 @@ static ssize_t write_scan_unevictable_node(struct sys_device *dev,
}
-static SYSDEV_ATTR(scan_unevictable_pages, S_IRUGO | S_IWUSR,
+static DEVICE_ATTR(scan_unevictable_pages, S_IRUGO | S_IWUSR,
read_scan_unevictable_node,
write_scan_unevictable_node);
int scan_unevictable_register_node(struct node *node)
{
- return sysdev_create_file(&node->sysdev, &attr_scan_unevictable_pages);
+ return device_create_file(&node->dev, &dev_attr_scan_unevictable_pages);
}
void scan_unevictable_unregister_node(struct node *node)
{
- sysdev_remove_file(&node->sysdev, &attr_scan_unevictable_pages);
+ device_remove_file(&node->dev, &dev_attr_scan_unevictable_pages);
}
#endif
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 8fd603b1665e..f600557a7659 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -295,7 +295,7 @@ void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
}
EXPORT_SYMBOL(__dec_zone_page_state);
-#ifdef CONFIG_CMPXCHG_LOCAL
+#ifdef CONFIG_HAVE_CMPXCHG_LOCAL
/*
* If we have cmpxchg_local support then we do not need to incur the overhead
* that comes with local_irq_save/restore if we use this_cpu_cmpxchg.
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 09:45:03 +0100