diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/Kconfig | 2 | ||||
| -rw-r--r-- | mm/backing-dev.c | 9 | ||||
| -rw-r--r-- | mm/bootmem.c | 13 | ||||
| -rw-r--r-- | mm/bounce.c | 2 | ||||
| -rw-r--r-- | mm/compaction.c | 7 | ||||
| -rw-r--r-- | mm/fremap.c | 7 | ||||
| -rw-r--r-- | mm/hugetlb.c | 24 | ||||
| -rw-r--r-- | mm/ksm.c | 9 | ||||
| -rw-r--r-- | mm/memblock.c | 837 | ||||
| -rw-r--r-- | mm/memcontrol.c | 10 | ||||
| -rw-r--r-- | mm/memory-failure.c | 12 | ||||
| -rw-r--r-- | mm/memory.c | 43 | ||||
| -rw-r--r-- | mm/memory_hotplug.c | 18 | ||||
| -rw-r--r-- | mm/mlock.c | 6 | ||||
| -rw-r--r-- | mm/mmap.c | 1 | ||||
| -rw-r--r-- | mm/mmzone.c | 21 | ||||
| -rw-r--r-- | mm/oom_kill.c | 49 | ||||
| -rw-r--r-- | mm/page_alloc.c | 123 | ||||
| -rw-r--r-- | mm/percpu.c | 2 | ||||
| -rw-r--r-- | mm/rmap.c | 23 | ||||
| -rw-r--r-- | mm/sparse-vmemmap.c | 11 | ||||
| -rw-r--r-- | mm/swapfile.c | 129 | ||||
| -rw-r--r-- | mm/vmalloc.c | 9 | ||||
| -rw-r--r-- | mm/vmscan.c | 43 | ||||
| -rw-r--r-- | mm/vmstat.c | 16 |
25 files changed, 919 insertions, 507 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index 01a57447a410..c2c8a4a11898 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -189,7 +189,7 @@ config COMPACTION config MIGRATION bool "Page migration" def_bool y - depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE + depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE || COMPACTION help Allows the migration of the physical location of pages of processes while the virtual addresses are not changed. This is useful in diff --git a/mm/backing-dev.c b/mm/backing-dev.c index eaa4a5bbe063..65d420499a61 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -30,6 +30,7 @@ EXPORT_SYMBOL_GPL(default_backing_dev_info); struct backing_dev_info noop_backing_dev_info = { .name = "noop", + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, }; EXPORT_SYMBOL_GPL(noop_backing_dev_info); @@ -243,6 +244,7 @@ static int __init default_bdi_init(void) err = bdi_init(&default_backing_dev_info); if (!err) bdi_register(&default_backing_dev_info, NULL, "default"); + err = bdi_init(&noop_backing_dev_info); return err; } @@ -445,8 +447,8 @@ static int bdi_forker_thread(void *ptr) switch (action) { case FORK_THREAD: __set_current_state(TASK_RUNNING); - task = kthread_run(bdi_writeback_thread, &bdi->wb, "flush-%s", - dev_name(bdi->dev)); + task = kthread_create(bdi_writeback_thread, &bdi->wb, + "flush-%s", dev_name(bdi->dev)); if (IS_ERR(task)) { /* * If thread creation fails, force writeout of @@ -457,10 +459,13 @@ static int bdi_forker_thread(void *ptr) /* * The spinlock makes sure we do not lose * wake-ups when racing with 'bdi_queue_work()'. + * And as soon as the bdi thread is visible, we + * can start it. */ spin_lock_bh(&bdi->wb_lock); bdi->wb.task = task; spin_unlock_bh(&bdi->wb_lock); + wake_up_process(task); } break; diff --git a/mm/bootmem.c b/mm/bootmem.c index 142c84a54993..13b0caa9793c 100644 --- a/mm/bootmem.c +++ b/mm/bootmem.c @@ -15,6 +15,7 @@ #include <linux/module.h> #include <linux/kmemleak.h> #include <linux/range.h> +#include <linux/memblock.h> #include <asm/bug.h> #include <asm/io.h> @@ -434,7 +435,8 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, unsigned long size) { #ifdef CONFIG_NO_BOOTMEM - free_early(physaddr, physaddr + size); + kmemleak_free_part(__va(physaddr), size); + memblock_x86_free_range(physaddr, physaddr + size); #else unsigned long start, end; @@ -459,7 +461,8 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, void __init free_bootmem(unsigned long addr, unsigned long size) { #ifdef CONFIG_NO_BOOTMEM - free_early(addr, addr + size); + kmemleak_free_part(__va(addr), size); + memblock_x86_free_range(addr, addr + size); #else unsigned long start, end; @@ -526,6 +529,12 @@ int __init reserve_bootmem(unsigned long addr, unsigned long size, } #ifndef CONFIG_NO_BOOTMEM +int __weak __init reserve_bootmem_generic(unsigned long phys, unsigned long len, + int flags) +{ + return reserve_bootmem(phys, len, flags); +} + static unsigned long __init align_idx(struct bootmem_data *bdata, unsigned long idx, unsigned long step) { diff --git a/mm/bounce.c b/mm/bounce.c index 13b6dad1eed2..1481de68184b 100644 --- a/mm/bounce.c +++ b/mm/bounce.c @@ -116,8 +116,8 @@ static void copy_to_high_bio_irq(struct bio *to, struct bio *from) */ vfrom = page_address(fromvec->bv_page) + tovec->bv_offset; - flush_dcache_page(tovec->bv_page); bounce_copy_vec(tovec, vfrom); + flush_dcache_page(tovec->bv_page); } } diff --git a/mm/compaction.c b/mm/compaction.c index 94cce51b0b35..4d709ee59013 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -214,15 +214,16 @@ static void acct_isolated(struct zone *zone, struct compact_control *cc) /* Similar to reclaim, but different enough that they don't share logic */ static bool too_many_isolated(struct zone *zone) { - - unsigned long inactive, isolated; + unsigned long active, inactive, isolated; inactive = zone_page_state(zone, NR_INACTIVE_FILE) + zone_page_state(zone, NR_INACTIVE_ANON); + active = zone_page_state(zone, NR_ACTIVE_FILE) + + zone_page_state(zone, NR_ACTIVE_ANON); isolated = zone_page_state(zone, NR_ISOLATED_FILE) + zone_page_state(zone, NR_ISOLATED_ANON); - return isolated > inactive; + return isolated > (inactive + active) / 2; } /* diff --git a/mm/fremap.c b/mm/fremap.c index 46f5dacf90a2..ec520c7b28df 100644 --- a/mm/fremap.c +++ b/mm/fremap.c @@ -125,7 +125,6 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, { struct mm_struct *mm = current->mm; struct address_space *mapping; - unsigned long end = start + size; struct vm_area_struct *vma; int err = -EINVAL; int has_write_lock = 0; @@ -142,6 +141,10 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, if (start + size <= start) return err; + /* Does pgoff wrap? */ + if (pgoff + (size >> PAGE_SHIFT) < pgoff) + return err; + /* Can we represent this offset inside this architecture's pte's? */ #if PTE_FILE_MAX_BITS < BITS_PER_LONG if (pgoff + (size >> PAGE_SHIFT) >= (1UL << PTE_FILE_MAX_BITS)) @@ -168,7 +171,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, if (!(vma->vm_flags & VM_CAN_NONLINEAR)) goto out; - if (end <= start || start < vma->vm_start || end > vma->vm_end) + if (start < vma->vm_start || start + size > vma->vm_end) goto out; /* Must set VM_NONLINEAR before any pages are populated. */ diff --git a/mm/hugetlb.c b/mm/hugetlb.c index cc5be788a39f..c03273807182 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2324,11 +2324,8 @@ retry_avoidcopy: * and just make the page writable */ avoidcopy = (page_mapcount(old_page) == 1); if (avoidcopy) { - if (!trylock_page(old_page)) { - if (PageAnon(old_page)) - page_move_anon_rmap(old_page, vma, address); - } else - unlock_page(old_page); + if (PageAnon(old_page)) + page_move_anon_rmap(old_page, vma, address); set_huge_ptep_writable(vma, address, ptep); return 0; } @@ -2404,7 +2401,7 @@ retry_avoidcopy: set_huge_pte_at(mm, address, ptep, make_huge_pte(vma, new_page, 1)); page_remove_rmap(old_page); - hugepage_add_anon_rmap(new_page, vma, address); + hugepage_add_new_anon_rmap(new_page, vma, address); /* Make the old page be freed below */ new_page = old_page; mmu_notifier_invalidate_range_end(mm, @@ -2631,10 +2628,16 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, vma, address); } - if (!pagecache_page) { - page = pte_page(entry); + /* + * hugetlb_cow() requires page locks of pte_page(entry) and + * pagecache_page, so here we need take the former one + * when page != pagecache_page or !pagecache_page. + * Note that locking order is always pagecache_page -> page, + * so no worry about deadlock. + */ + page = pte_page(entry); + if (page != pagecache_page) lock_page(page); - } spin_lock(&mm->page_table_lock); /* Check for a racing update before calling hugetlb_cow */ @@ -2661,9 +2664,8 @@ out_page_table_lock: if (pagecache_page) { unlock_page(pagecache_page); put_page(pagecache_page); - } else { - unlock_page(page); } + unlock_page(page); out_mutex: mutex_unlock(&hugetlb_instantiation_mutex); @@ -712,7 +712,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page, if (!ptep) goto out; - if (pte_write(*ptep)) { + if (pte_write(*ptep) || pte_dirty(*ptep)) { pte_t entry; swapped = PageSwapCache(page); @@ -735,7 +735,9 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page, set_pte_at(mm, addr, ptep, entry); goto out_unlock; } - entry = pte_wrprotect(entry); + if (pte_dirty(entry)) + set_page_dirty(page); + entry = pte_mkclean(pte_wrprotect(entry)); set_pte_at_notify(mm, addr, ptep, entry); } *orig_pte = *ptep; @@ -1504,8 +1506,6 @@ struct page *ksm_does_need_to_copy(struct page *page, { struct page *new_page; - unlock_page(page); /* any racers will COW it, not modify it */ - new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); if (new_page) { copy_user_highpage(new_page, page, address, vma); @@ -1521,7 +1521,6 @@ struct page *ksm_does_need_to_copy(struct page *page, add_page_to_unevictable_list(new_page); } - page_cache_release(page); return new_page; } diff --git a/mm/memblock.c b/mm/memblock.c index 43840b305ecb..400dc62697d7 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -11,237 +11,423 @@ */ #include <linux/kernel.h> +#include <linux/slab.h> #include <linux/init.h> #include <linux/bitops.h> +#include <linux/poison.h> +#include <linux/pfn.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> #include <linux/memblock.h> -#define MEMBLOCK_ALLOC_ANYWHERE 0 +struct memblock memblock __initdata_memblock; -struct memblock memblock; +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_debug; +/* 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) +{ + if (type == &memblock.memory) + return "memory"; + else if (type == &memblock.reserved) + return "reserved"; + else + return "unknown"; +} -static int __init early_memblock(char *p) +/* + * Address comparison utilities + */ + +static phys_addr_t __init_memblock memblock_align_down(phys_addr_t addr, phys_addr_t size) { - if (p && strstr(p, "debug")) - memblock_debug = 1; + return addr & ~(size - 1); +} + +static phys_addr_t __init_memblock memblock_align_up(phys_addr_t addr, phys_addr_t size) +{ + return (addr + (size - 1)) & ~(size - 1); +} + +static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1, + phys_addr_t base2, phys_addr_t size2) +{ + return ((base1 < (base2 + size2)) && (base2 < (base1 + size1))); +} + +static long __init_memblock memblock_addrs_adjacent(phys_addr_t base1, phys_addr_t size1, + phys_addr_t base2, phys_addr_t size2) +{ + if (base2 == base1 + size1) + return 1; + else if (base1 == base2 + size2) + return -1; + return 0; } -early_param("memblock", early_memblock); -static void memblock_dump(struct memblock_region *region, char *name) +static long __init_memblock memblock_regions_adjacent(struct memblock_type *type, + unsigned long r1, unsigned long r2) { - unsigned long long base, size; - int i; + phys_addr_t base1 = type->regions[r1].base; + phys_addr_t size1 = type->regions[r1].size; + phys_addr_t base2 = type->regions[r2].base; + phys_addr_t size2 = type->regions[r2].size; - pr_info(" %s.cnt = 0x%lx\n", name, region->cnt); + return memblock_addrs_adjacent(base1, size1, base2, size2); +} - for (i = 0; i < region->cnt; i++) { - base = region->region[i].base; - size = region->region[i].size; +long __init_memblock memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size) +{ + unsigned long i; - pr_info(" %s[0x%x]\t0x%016llx - 0x%016llx, 0x%llx bytes\n", - name, i, base, base + size - 1, size); + for (i = 0; i < type->cnt; i++) { + phys_addr_t rgnbase = type->regions[i].base; + phys_addr_t rgnsize = type->regions[i].size; + if (memblock_addrs_overlap(base, size, rgnbase, rgnsize)) + break; } + + return (i < type->cnt) ? i : -1; } -void memblock_dump_all(void) +/* + * Find, allocate, deallocate or reserve unreserved regions. All allocations + * are top-down. + */ + +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) { - if (!memblock_debug) - return; + phys_addr_t base, res_base; + long j; - pr_info("MEMBLOCK configuration:\n"); - pr_info(" rmo_size = 0x%llx\n", (unsigned long long)memblock.rmo_size); - pr_info(" memory.size = 0x%llx\n", (unsigned long long)memblock.memory.size); + /* In case, huge size is requested */ + if (end < size) + return MEMBLOCK_ERROR; - memblock_dump(&memblock.memory, "memory"); - memblock_dump(&memblock.reserved, "reserved"); + base = memblock_align_down((end - size), align); + + /* 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); + } + + return MEMBLOCK_ERROR; } -static unsigned long memblock_addrs_overlap(u64 base1, u64 size1, u64 base2, - u64 size2) +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) { - return ((base1 < (base2 + size2)) && (base2 < (base1 + size1))); + long i; + + BUG_ON(0 == size); + + size = memblock_align_up(size, align); + + /* Pump up max_addr */ + 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; + + 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; + } + return MEMBLOCK_ERROR; } -static long memblock_addrs_adjacent(u64 base1, u64 size1, u64 base2, u64 size2) +/* + * Find a free area with specified alignment in a specific range. + */ +u64 __init_memblock memblock_find_in_range(u64 start, u64 end, u64 size, u64 align) { - if (base2 == base1 + size1) - return 1; - else if (base1 == base2 + size2) - return -1; + return memblock_find_base(size, align, start, end); +} - return 0; +/* + * Free memblock.reserved.regions + */ +int __init_memblock memblock_free_reserved_regions(void) +{ + if (memblock.reserved.regions == memblock_reserved_init_regions) + return 0; + + return memblock_free(__pa(memblock.reserved.regions), + sizeof(struct memblock_region) * memblock.reserved.max); } -static long memblock_regions_adjacent(struct memblock_region *rgn, - unsigned long r1, unsigned long r2) +/* + * Reserve memblock.reserved.regions + */ +int __init_memblock memblock_reserve_reserved_regions(void) { - u64 base1 = rgn->region[r1].base; - u64 size1 = rgn->region[r1].size; - u64 base2 = rgn->region[r2].base; - u64 size2 = rgn->region[r2].size; + if (memblock.reserved.regions == memblock_reserved_init_regions) + return 0; - return memblock_addrs_adjacent(base1, size1, base2, size2); + return memblock_reserve(__pa(memblock.reserved.regions), + sizeof(struct memblock_region) * memblock.reserved.max); } -static void memblock_remove_region(struct memblock_region *rgn, unsigned long r) +static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r) { unsigned long i; - for (i = r; i < rgn->cnt - 1; i++) { - rgn->region[i].base = rgn->region[i + 1].base; - rgn->region[i].size = rgn->region[i + 1].size; + 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; } - rgn->cnt--; + type->cnt--; } /* Assumption: base addr of region 1 < base addr of region 2 */ -static void memblock_coalesce_regions(struct memblock_region *rgn, +static void __init_memblock memblock_coalesce_regions(struct memblock_type *type, unsigned long r1, unsigned long r2) { - rgn->region[r1].size += rgn->region[r2].size; - memblock_remove_region(rgn, r2); + type->regions[r1].size += type->regions[r2].size; + memblock_remove_region(type, r2); } -void __init memblock_init(void) +/* 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) { - /* Create a dummy zero size MEMBLOCK which will get coalesced away later. - * This simplifies the memblock_add() code below... + struct memblock_region *new_array, *old_array; + phys_addr_t old_size, new_size, addr; + int use_slab = slab_is_available(); + + /* We don't allow resizing until we know about the reserved regions + * of memory that aren't suitable for allocation */ - memblock.memory.region[0].base = 0; - memblock.memory.region[0].size = 0; - memblock.memory.cnt = 1; + if (!memblock_can_resize) + return -1; - /* Ditto. */ - memblock.reserved.region[0].base = 0; - memblock.reserved.region[0].size = 0; - memblock.reserved.cnt = 1; -} + /* Calculate new doubled size */ + old_size = type->max * sizeof(struct memblock_region); + new_size = old_size << 1; + + /* Try to find some space for it. + * + * WARNING: We assume that either slab_is_available() and we use it or + * we use MEMBLOCK for allocations. That means that this is unsafe to use + * when bootmem is currently active (unless bootmem itself is implemented + * on top of MEMBLOCK which isn't the case yet) + * + * This should however not be an issue for now, as we currently only + * call into MEMBLOCK while it's still active, or much later when slab is + * active for memory hotplug operations + */ + if (use_slab) { + new_array = kmalloc(new_size, GFP_KERNEL); + addr = new_array == NULL ? MEMBLOCK_ERROR : __pa(new_array); + } else + addr = memblock_find_base(new_size, sizeof(phys_addr_t), 0, MEMBLOCK_ALLOC_ACCESSIBLE); + if (addr == MEMBLOCK_ERROR) { + 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; + } + new_array = __va(addr); -void __init memblock_analyze(void) -{ - int i; + memblock_dbg("memblock: %s array is doubled to %ld at [%#010llx-%#010llx]", + memblock_type_name(type), type->max * 2, (u64)addr, (u64)addr + new_size - 1); - memblock.memory.size = 0; + /* Found space, we now need to move the array over before + * we add the reserved region since it may be our reserved + * array itself that is full. + */ + memcpy(new_array, type->regions, old_size); + memset(new_array + type->max, 0, old_size); + old_array = type->regions; + type->regions = new_array; + type->max <<= 1; + + /* If we use SLAB that's it, we are done */ + if (use_slab) + return 0; - for (i = 0; i < memblock.memory.cnt; i++) - memblock.memory.size += memblock.memory.region[i].size; + /* Add the new reserved region now. Should not fail ! */ + BUG_ON(memblock_add_region(&memblock.reserved, addr, new_size) < 0); + + /* 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 + * to use kfree or free_bootmem_pages(). Shouldn't be a big deal + * anyways + */ + if (old_array != memblock_memory_init_regions && + old_array != memblock_reserved_init_regions) + memblock_free(__pa(old_array), old_size); + + return 0; } -static long memblock_add_region(struct memblock_region *rgn, u64 base, u64 size) +extern 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) { unsigned long coalesced = 0; long adjacent, i; - if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) { - rgn->region[0].base = base; - rgn->region[0].size = size; + if ((type->cnt == 1) && (type->regions[0].size == 0)) { + type->regions[0].base = base; + type->regions[0].size = size; return 0; } /* First try and coalesce this MEMBLOCK with another. */ - for (i = 0; i < rgn->cnt; i++) { - u64 rgnbase = rgn->region[i].base; - u64 rgnsize = rgn->region[i].size; + for (i = 0; i < type->cnt; i++) { + phys_addr_t rgnbase = type->regions[i].base; + phys_addr_t rgnsize = type->regions[i].size; if ((rgnbase == base) && (rgnsize == size)) /* Already have this region, so we're done */ return 0; adjacent = memblock_addrs_adjacent(base, size, rgnbase, rgnsize); + /* Check if arch allows coalescing */ + if (adjacent != 0 && type == &memblock.memory && + !memblock_memory_can_coalesce(base, size, rgnbase, rgnsize)) + break; if (adjacent > 0) { - rgn->region[i].base -= size; - rgn->region[i].size += size; + type->regions[i].base -= size; + type->regions[i].size += size; coalesced++; break; } else if (adjacent < 0) { - rgn->region[i].size += size; + type->regions[i].size += size; coalesced++; break; } } - if ((i < rgn->cnt - 1) && memblock_regions_adjacent(rgn, i, i+1)) { - memblock_coalesce_regions(rgn, i, i+1); + /* If we plugged a hole, we may want to also coalesce with the + * next region + */ + if ((i < type->cnt - 1) && memblock_regions_adjacent(type, i, i+1) && + ((type != &memblock.memory || memblock_memory_can_coalesce(type->regions[i].base, + type->regions[i].size, + type->regions[i+1].base, + type->regions[i+1].size)))) { + memblock_coalesce_regions(type, i, i+1); coalesced++; } if (coalesced) return coalesced; - if (rgn->cnt >= MAX_MEMBLOCK_REGIONS) + + /* 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. + */ + if (WARN_ON(type->cnt >= type->max)) return -1; /* Couldn't coalesce the MEMBLOCK, so add it to the sorted table. */ - for (i = rgn->cnt - 1; i >= 0; i--) { - if (base < rgn->region[i].base) { - rgn->region[i+1].base = rgn->region[i].base; - rgn->region[i+1].size = rgn->region[i].size; + 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 { - rgn->region[i+1].base = base; - rgn->region[i+1].size = size; + type->regions[i+1].base = base; + type->regions[i+1].size = size; break; } } - if (base < rgn->region[0].base) { - rgn->region[0].base = base; - rgn->region[0].size = size; + if (base < type->regions[0].base) { + type->regions[0].base = base; + type->regions[0].size = size; + } + type->cnt++; + + /* The array is full ? Try to resize it. If that fails, we undo + * our allocation and return an error + */ + if (type->cnt == type->max && memblock_double_array(type)) { + type->cnt--; + return -1; } - rgn->cnt++; return 0; } -long memblock_add(u64 base, u64 size) +long __init_memblock memblock_add(phys_addr_t base, phys_addr_t size) { - struct memblock_region *_rgn = &memblock.memory; - - /* On pSeries LPAR systems, the first MEMBLOCK is our RMO region. */ - if (base == 0) - memblock.rmo_size = size; - - return memblock_add_region(_rgn, base, size); + return memblock_add_region(&memblock.memory, base, size); } -static long __memblock_remove(struct memblock_region *rgn, u64 base, u64 size) +static long __init_memblock __memblock_remove(struct memblock_type *type, phys_addr_t base, phys_addr_t size) { - u64 rgnbegin, rgnend; - u64 end = base + size; + phys_addr_t rgnbegin, rgnend; + phys_addr_t end = base + size; int i; rgnbegin = rgnend = 0; /* supress gcc warnings */ /* Find the region where (base, size) belongs to */ - for (i=0; i < rgn->cnt; i++) { - rgnbegin = rgn->region[i].base; - rgnend = rgnbegin + rgn->region[i].size; + for (i=0; i < type->cnt; i++) { + rgnbegin = type->regions[i].base; + rgnend = rgnbegin + type->regions[i].size; if ((rgnbegin <= base) && (end <= rgnend)) break; } /* Didn't find the region */ - if (i == rgn->cnt) + if (i == type->cnt) return -1; /* Check to see if we are removing entire region */ if ((rgnbegin == base) && (rgnend == end)) { - memblock_remove_region(rgn, i); + memblock_remove_region(type, i); return 0; } /* Check to see if region is matching at the front */ if (rgnbegin == base) { - rgn->region[i].base = end; - rgn->region[i].size -= size; + type->regions[i].base = end; + type->regions[i].size -= size; return 0; } /* Check to see if the region is matching at the end */ if (rgnend == end) { - rgn->region[i].size -= size; + type->regions[i].size -= size; return 0; } @@ -249,208 +435,189 @@ static long __memblock_remove(struct memblock_region *rgn, u64 base, u64 size) * We need to split the entry - adjust the current one to the * beginging of the hole and add the region after hole. */ - rgn->region[i].size = base - rgn->region[i].base; - return memblock_add_region(rgn, end, rgnend - end); + type->regions[i].size = base - type->regions[i].base; + return memblock_add_region(type, end, rgnend - end); } -long memblock_remove(u64 base, u64 size) +long __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size) { return __memblock_remove(&memblock.memory, base, size); } -long __init memblock_free(u64 base, u64 size) +long __init_memblock memblock_free(phys_addr_t base, phys_addr_t size) { return __memblock_remove(&memblock.reserved, base, size); } -long __init memblock_reserve(u64 base, u64 size) +long __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size) { - struct memblock_region *_rgn = &memblock.reserved; + struct memblock_type *_rgn = &memblock.reserved; BUG_ON(0 == size); return memblock_add_region(_rgn, base, size); } -long memblock_overlaps_region(struct memblock_region *rgn, u64 base, u64 size) +phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr) { - unsigned long i; + phys_addr_t found; - for (i = 0; i < rgn->cnt; i++) { - u64 rgnbase = rgn->region[i].base; - u64 rgnsize = rgn->region[i].size; - if (memblock_addrs_overlap(base, size, rgnbase, rgnsize)) - break; - } + /* 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); - return (i < rgn->cnt) ? i : -1; + found = memblock_find_base(size, align, 0, max_addr); + if (found != MEMBLOCK_ERROR && + memblock_add_region(&memblock.reserved, found, size) >= 0) + return found; + + return 0; } -static u64 memblock_align_down(u64 addr, u64 size) +phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr) { - return addr & ~(size - 1); + phys_addr_t alloc; + + alloc = __memblock_alloc_base(size, align, max_addr); + + 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; } -static u64 memblock_align_up(u64 addr, u64 size) +phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align) { - return (addr + (size - 1)) & ~(size - 1); + return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE); } -static u64 __init memblock_alloc_nid_unreserved(u64 start, u64 end, - u64 size, u64 align) + +/* + * 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. + */ + +phys_addr_t __weak __init memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid) { - u64 base, res_base; - long j; +#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; - base = memblock_align_down((end - size), align); - while (start <= base) { - j = memblock_overlaps_region(&memblock.reserved, base, size); - if (j < 0) { - /* this area isn't reserved, take it */ - if (memblock_add_region(&memblock.reserved, base, size) < 0) - base = ~(u64)0; - return base; - } - res_base = memblock.reserved.region[j].base; - if (res_base < size) - break; - base = memblock_align_down(res_base - size, align); + 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)) + continue; + *nid = i; + return min(end, PFN_PHYS(end_pfn)); } +#endif + *nid = 0; - return ~(u64)0; + return end; } -static u64 __init memblock_alloc_nid_region(struct memblock_property *mp, - u64 (*nid_range)(u64, u64, int *), - u64 size, u64 align, int nid) +static phys_addr_t __init memblock_alloc_nid_region(struct memblock_region *mp, + phys_addr_t size, + phys_addr_t align, int nid) { - u64 start, end; + phys_addr_t start, end; start = mp->base; end = start + mp->size; start = memblock_align_up(start, align); while (start < end) { - u64 this_end; + phys_addr_t this_end; int this_nid; - this_end = nid_range(start, end, &this_nid); + this_end = memblock_nid_range(start, end, &this_nid); if (this_nid == nid) { - u64 ret = memblock_alloc_nid_unreserved(start, this_end, - size, align); - if (ret != ~(u64)0) + phys_addr_t ret = memblock_find_region(start, this_end, size, align); + if (ret != MEMBLOCK_ERROR && + memblock_add_region(&memblock.reserved, ret, size) >= 0) return ret; } start = this_end; } - return ~(u64)0; + return MEMBLOCK_ERROR; } -u64 __init memblock_alloc_nid(u64 size, u64 align, int nid, - u64 (*nid_range)(u64 start, u64 end, int *nid)) +phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid) { - struct memblock_region *mem = &memblock.memory; + struct memblock_type *mem = &memblock.memory; int i; BUG_ON(0 == size); + /* 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); + /* 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++) { - u64 ret = memblock_alloc_nid_region(&mem->region[i], - nid_range, + phys_addr_t ret = memblock_alloc_nid_region(&mem->regions[i], size, align, nid); - if (ret != ~(u64)0) + if (ret != MEMBLOCK_ERROR) return ret; } - return memblock_alloc(size, align); -} - -u64 __init memblock_alloc(u64 size, u64 align) -{ - return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); + return 0; } -u64 __init memblock_alloc_base(u64 size, u64 align, u64 max_addr) +phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid) { - u64 alloc; - - alloc = __memblock_alloc_base(size, align, max_addr); + phys_addr_t res = memblock_alloc_nid(size, align, nid); - 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; + if (res) + return res; + return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); } -u64 __init __memblock_alloc_base(u64 size, u64 align, u64 max_addr) -{ - long i, j; - u64 base = 0; - u64 res_base; - - BUG_ON(0 == size); - size = memblock_align_up(size, align); - - /* On some platforms, make sure we allocate lowmem */ - /* Note that MEMBLOCK_REAL_LIMIT may be MEMBLOCK_ALLOC_ANYWHERE */ - if (max_addr == MEMBLOCK_ALLOC_ANYWHERE) - max_addr = MEMBLOCK_REAL_LIMIT; - - for (i = memblock.memory.cnt - 1; i >= 0; i--) { - u64 memblockbase = memblock.memory.region[i].base; - u64 memblocksize = memblock.memory.region[i].size; - - if (memblocksize < size) - continue; - if (max_addr == MEMBLOCK_ALLOC_ANYWHERE) - base = memblock_align_down(memblockbase + memblocksize - size, align); - else if (memblockbase < max_addr) { - base = min(memblockbase + memblocksize, max_addr); - base = memblock_align_down(base - size, align); - } else - continue; - - while (base && memblockbase <= base) { - j = memblock_overlaps_region(&memblock.reserved, base, size); - if (j < 0) { - /* this area isn't reserved, take it */ - if (memblock_add_region(&memblock.reserved, base, size) < 0) - return 0; - return base; - } - res_base = memblock.reserved.region[j].base; - if (res_base < size) - break; - base = memblock_align_down(res_base - size, align); - } - } - return 0; -} +/* + * Remaining API functions + */ /* You must call memblock_analyze() before this. */ -u64 __init memblock_phys_mem_size(void) +phys_addr_t __init memblock_phys_mem_size(void) { - return memblock.memory.size; + return memblock.memory_size; } -u64 memblock_end_of_DRAM(void) +phys_addr_t __init_memblock memblock_end_of_DRAM(void) { int idx = memblock.memory.cnt - 1; - return (memblock.memory.region[idx].base + memblock.memory.region[idx].size); + return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size); } /* You must call memblock_analyze() after this. */ -void __init memblock_enforce_memory_limit(u64 memory_limit) +void __init memblock_enforce_memory_limit(phys_addr_t memory_limit) { unsigned long i; - u64 limit; - struct memblock_property *p; + phys_addr_t limit; + struct memblock_region *p; if (!memory_limit) return; @@ -458,24 +625,21 @@ void __init memblock_enforce_memory_limit(u64 memory_limit) /* Truncate the memblock regions to satisfy the memory limit. */ limit = memory_limit; for (i = 0; i < memblock.memory.cnt; i++) { - if (limit > memblock.memory.region[i].size) { - limit -= memblock.memory.region[i].size; + if (limit > memblock.memory.regions[i].size) { + limit -= memblock.memory.regions[i].size; continue; } - memblock.memory.region[i].size = limit; + memblock.memory.regions[i].size = limit; memblock.memory.cnt = i + 1; break; } - if (memblock.memory.region[0].size < memblock.rmo_size) - memblock.rmo_size = memblock.memory.region[0].size; - memory_limit = memblock_end_of_DRAM(); /* And truncate any reserves above the limit also. */ for (i = 0; i < memblock.reserved.cnt; i++) { - p = &memblock.reserved.region[i]; + p = &memblock.reserved.regions[i]; if (p->base > memory_limit) p->size = 0; @@ -489,53 +653,190 @@ void __init memblock_enforce_memory_limit(u64 memory_limit) } } -int __init memblock_is_reserved(u64 addr) +static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr) +{ + unsigned int left = 0, right = type->cnt; + + do { + unsigned int mid = (right + left) / 2; + + if (addr < type->regions[mid].base) + right = mid; + else if (addr >= (type->regions[mid].base + + type->regions[mid].size)) + left = mid + 1; + else + return mid; + } while (left < right); + return -1; +} + +int __init memblock_is_reserved(phys_addr_t addr) +{ + return memblock_search(&memblock.reserved, addr) != -1; +} + +int __init_memblock memblock_is_memory(phys_addr_t addr) +{ + return memblock_search(&memblock.memory, addr) != -1; +} + +int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size) +{ + int idx = memblock_search(&memblock.reserved, base); + + if (idx == -1) + return 0; + return memblock.reserved.regions[idx].base <= base && + (memblock.reserved.regions[idx].base + + memblock.reserved.regions[idx].size) >= (base + size); +} + +int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size) +{ + return memblock_overlaps_region(&memblock.reserved, base, size) >= 0; +} + + +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) +{ + unsigned long long base, size; int i; - for (i = 0; i < memblock.reserved.cnt; i++) { - u64 upper = memblock.reserved.region[i].base + - memblock.reserved.region[i].size - 1; - if ((addr >= memblock.reserved.region[i].base) && (addr <= upper)) - return 1; + pr_info(" %s.cnt = 0x%lx\n", name, region->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); } - return 0; } -int memblock_is_region_reserved(u64 base, u64 size) +void __init_memblock memblock_dump_all(void) { - return memblock_overlaps_region(&memblock.reserved, base, size) >= 0; + if (!memblock_debug) + return; + + pr_info("MEMBLOCK configuration:\n"); + pr_info(" memory size = 0x%llx\n", (unsigned long long)memblock.memory_size); + + memblock_dump(&memblock.memory, "memory"); + memblock_dump(&memblock.reserved, "reserved"); } -/* - * Given a <base, len>, find which memory regions belong to this range. - * Adjust the request and return a contiguous chunk. - */ -int memblock_find(struct memblock_property *res) +void __init memblock_analyze(void) { int i; - u64 rstart, rend; - rstart = res->base; - rend = rstart + res->size - 1; + /* Check marker in the unused last array entry */ + WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base + != (phys_addr_t)RED_INACTIVE); + WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base + != (phys_addr_t)RED_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 = (phys_addr_t)RED_INACTIVE; + memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_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")) + memblock_debug = 1; + return 0; +} +early_param("memblock", early_memblock); + +#if defined(CONFIG_DEBUG_FS) && !defined(ARCH_DISCARD_MEMBLOCK) + +static int memblock_debug_show(struct seq_file *m, void *private) +{ + struct memblock_type *type = m->private; + struct memblock_region *reg; + int i; + + for (i = 0; i < type->cnt; i++) { + reg = &type->regions[i]; + seq_printf(m, "%4d: ", i); + if (sizeof(phys_addr_t) == 4) + seq_printf(m, "0x%08lx..0x%08lx\n", + (unsigned long)reg->base, + (unsigned long)(reg->base + reg->size - 1)); + else + seq_printf(m, "0x%016llx..0x%016llx\n", + (unsigned long long)reg->base, + (unsigned long long)(reg->base + reg->size - 1)); - for (i = 0; i < memblock.memory.cnt; i++) { - u64 start = memblock.memory.region[i].base; - u64 end = start + memblock.memory.region[i].size - 1; - - if (start > rend) - return -1; - - if ((end >= rstart) && (start < rend)) { - /* adjust the request */ - if (rstart < start) - rstart = start; - if (rend > end) - rend = end; - res->base = rstart; - res->size = rend - rstart + 1; - return 0; - } } - return -1; + return 0; +} + +static int memblock_debug_open(struct inode *inode, struct file *file) +{ + return single_open(file, memblock_debug_show, inode->i_private); } + +static const struct file_operations memblock_debug_fops = { + .open = memblock_debug_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init memblock_init_debugfs(void) +{ + struct dentry *root = debugfs_create_dir("memblock", NULL); + if (!root) + return -ENXIO; + debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops); + debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops); + + return 0; +} +__initcall(memblock_init_debugfs); + +#endif /* CONFIG_DEBUG_FS */ diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 3eed583895a6..9be3cf8a5da4 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3587,9 +3587,13 @@ unlock: static void mem_cgroup_threshold(struct mem_cgroup *memcg) { - __mem_cgroup_threshold(memcg, false); - if (do_swap_account) - __mem_cgroup_threshold(memcg, true); + while (memcg) { + __mem_cgroup_threshold(memcg, false); + if (do_swap_account) + __mem_cgroup_threshold(memcg, true); + + memcg = parent_mem_cgroup(memcg); + } } static int compare_thresholds(const void *a, const void *b) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 9c26eeca1342..757f6b0accfe 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -183,7 +183,7 @@ EXPORT_SYMBOL_GPL(hwpoison_filter); * signal. */ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno, - unsigned long pfn) + unsigned long pfn, struct page *page) { struct siginfo si; int ret; @@ -198,7 +198,7 @@ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno, #ifdef __ARCH_SI_TRAPNO si.si_trapno = trapno; #endif - si.si_addr_lsb = PAGE_SHIFT; + si.si_addr_lsb = compound_order(compound_head(page)) + PAGE_SHIFT; /* * Don't use force here, it's convenient if the signal * can be temporarily blocked. @@ -235,7 +235,7 @@ void shake_page(struct page *p, int access) int nr; do { nr = shrink_slab(1000, GFP_KERNEL, 1000); - if (page_count(p) == 0) + if (page_count(p) == 1) break; } while (nr > 10); } @@ -327,7 +327,7 @@ static void add_to_kill(struct task_struct *tsk, struct page *p, * wrong earlier. */ static void kill_procs_ao(struct list_head *to_kill, int doit, int trapno, - int fail, unsigned long pfn) + int fail, struct page *page, unsigned long pfn) { struct to_kill *tk, *next; @@ -352,7 +352,7 @@ static void kill_procs_ao(struct list_head *to_kill, int doit, int trapno, * process anyways. */ else if (kill_proc_ao(tk->tsk, tk->addr, trapno, - pfn) < 0) + pfn, page) < 0) printk(KERN_ERR "MCE %#lx: Cannot send advisory machine check signal to %s:%d\n", pfn, tk->tsk->comm, tk->tsk->pid); @@ -928,7 +928,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn, * any accesses to the poisoned memory. */ kill_procs_ao(&tokill, !!PageDirty(hpage), trapno, - ret != SWAP_SUCCESS, pfn); + ret != SWAP_SUCCESS, p, pfn); return ret; } diff --git a/mm/memory.c b/mm/memory.c index 6b2ab1051851..98b58fecedef 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2623,7 +2623,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma, unsigned int flags, pte_t orig_pte) { spinlock_t *ptl; - struct page *page; + struct page *page, *swapcache = NULL; swp_entry_t entry; pte_t pte; struct mem_cgroup *ptr = NULL; @@ -2679,10 +2679,25 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma, lock_page(page); delayacct_clear_flag(DELAYACCT_PF_SWAPIN); - page = ksm_might_need_to_copy(page, vma, address); - if (!page) { - ret = VM_FAULT_OOM; - goto out; + /* + * Make sure try_to_free_swap or reuse_swap_page or swapoff did not + * release the swapcache from under us. The page pin, and pte_same + * test below, are not enough to exclude that. Even if it is still + * swapcache, we need to check that the page's swap has not changed. + */ + if (unlikely(!PageSwapCache(page) || page_private(page) != entry.val)) + goto out_page; + + if (ksm_might_need_to_copy(page, vma, address)) { + swapcache = page; + page = ksm_does_need_to_copy(page, vma, address); + + if (unlikely(!page)) { + ret = VM_FAULT_OOM; + page = swapcache; + swapcache = NULL; + goto out_page; + } } if (mem_cgroup_try_charge_swapin(mm, page, GFP_KERNEL, &ptr)) { @@ -2735,6 +2750,18 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma, if (vm_swap_full() || (vma->vm_flags & VM_LOCKED) || PageMlocked(page)) try_to_free_swap(page); unlock_page(page); + if (swapcache) { + /* + * Hold the lock to avoid the swap entry to be reused + * until we take the PT lock for the pte_same() check + * (to avoid false positives from pte_same). For + * further safety release the lock after the swap_free + * so that the swap count won't change under a + * parallel locked swapcache. + */ + unlock_page(swapcache); + page_cache_release(swapcache); + } if (flags & FAULT_FLAG_WRITE) { ret |= do_wp_page(mm, vma, address, page_table, pmd, ptl, pte); @@ -2756,6 +2783,10 @@ out_page: unlock_page(page); out_release: page_cache_release(page); + if (swapcache) { + unlock_page(swapcache); + page_cache_release(swapcache); + } return ret; } @@ -3154,7 +3185,7 @@ static inline int handle_pte_fault(struct mm_struct *mm, * with threads. */ if (flags & FAULT_FLAG_WRITE) - flush_tlb_page(vma, address); + flush_tlb_fix_spurious_fault(vma, address); } unlock: pte_unmap_unlock(pte, ptl); diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index a4cfcdc00455..d4e940a26945 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -584,19 +584,19 @@ static inline int pageblock_free(struct page *page) /* Return the start of the next active pageblock after a given page */ static struct page *next_active_pageblock(struct page *page) { - int pageblocks_stride; - /* Ensure the starting page is pageblock-aligned */ BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); - /* Move forward by at least 1 * pageblock_nr_pages */ - pageblocks_stride = 1; - /* If the entire pageblock is free, move to the end of free page */ - if (pageblock_free(page)) - pageblocks_stride += page_order(page) - pageblock_order; + if (pageblock_free(page)) { + int order; + /* be careful. we don't have locks, page_order can be changed.*/ + order = page_order(page); + if ((order < MAX_ORDER) && (order >= pageblock_order)) + return page + (1 << order); + } - return page + (pageblocks_stride * pageblock_nr_pages); + return page + pageblock_nr_pages; } /* Checks if this range of memory is likely to be hot-removable. */ @@ -840,7 +840,6 @@ repeat: ret = 0; if (drain) { lru_add_drain_all(); - flush_scheduled_work(); cond_resched(); drain_all_pages(); } @@ -862,7 +861,6 @@ repeat: } /* drain all zone's lru pagevec, this is asyncronous... */ lru_add_drain_all(); - flush_scheduled_work(); yield(); /* drain pcp pages , this is synchrouns. */ drain_all_pages(); diff --git a/mm/mlock.c b/mm/mlock.c index cbae7c5b9568..b70919ce4f72 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -135,12 +135,6 @@ void munlock_vma_page(struct page *page) } } -/* Is the vma a continuation of the stack vma above it? */ -static inline int vma_stack_continue(struct vm_area_struct *vma, unsigned long addr) -{ - return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); -} - static inline int stack_guard_page(struct vm_area_struct *vma, unsigned long addr) { return (vma->vm_flags & VM_GROWSDOWN) && diff --git a/mm/mmap.c b/mm/mmap.c index 6128dc8e5ede..00161a48a451 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2009,6 +2009,7 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma, removed_exe_file_vma(mm); fput(new->vm_file); } + unlink_anon_vmas(new); out_free_mpol: mpol_put(pol); out_free_vma: diff --git a/mm/mmzone.c b/mm/mmzone.c index f5b7d1760213..e35bfb82c855 100644 --- a/mm/mmzone.c +++ b/mm/mmzone.c @@ -87,3 +87,24 @@ int memmap_valid_within(unsigned long pfn, return 1; } #endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */ + +#ifdef CONFIG_SMP +/* Called when a more accurate view of NR_FREE_PAGES is needed */ +unsigned long zone_nr_free_pages(struct zone *zone) +{ + unsigned long nr_free_pages = zone_page_state(zone, NR_FREE_PAGES); + + /* + * While kswapd is awake, it is considered the zone is under some + * memory pressure. Under pressure, there is a risk that + * per-cpu-counter-drift will allow the min watermark to be breached + * potentially causing a live-lock. While kswapd is awake and + * free pages are low, get a better estimate for free pages + */ + if (nr_free_pages < zone->percpu_drift_mark && + !waitqueue_active(&zone->zone_pgdat->kswapd_wait)) + return zone_page_state_snapshot(zone, NR_FREE_PAGES); + + return nr_free_pages; +} +#endif /* CONFIG_SMP */ diff --git a/mm/oom_kill.c b/mm/oom_kill.c index fc81cb22869e..4029583a1024 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -121,8 +121,8 @@ 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, struct mem_cgroup *mem, - const nodemask_t *nodemask) +static bool oom_unkillable_task(struct task_struct *p, + const struct mem_cgroup *mem, const nodemask_t *nodemask) { if (is_global_init(p)) return true; @@ -208,8 +208,13 @@ unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem, */ points += p->signal->oom_score_adj; - if (points < 0) - return 0; + /* + * Never return 0 for an eligible task that may be killed since it's + * possible that no single user task uses more than 0.1% of memory and + * no single admin tasks uses more than 3.0%. + */ + if (points <= 0) + return 1; return (points < 1000) ? points : 1000; } @@ -339,26 +344,24 @@ static struct task_struct *select_bad_process(unsigned int *ppoints, /** * dump_tasks - dump current memory state of all system tasks * @mem: current's memory controller, if constrained + * @nodemask: nodemask passed to page allocator for mempolicy ooms * - * Dumps the current memory state of all system tasks, excluding kernel threads. + * Dumps the current memory state of all eligible tasks. Tasks not in the same + * memcg, not in the same cpuset, or bound to a disjoint set of mempolicy nodes + * are not shown. * State information includes task's pid, uid, tgid, vm size, rss, cpu, oom_adj * value, oom_score_adj value, and name. * - * If the actual is non-NULL, only tasks that are a member of the mem_cgroup are - * shown. - * * Call with tasklist_lock read-locked. */ -static void dump_tasks(const struct mem_cgroup *mem) +static void dump_tasks(const struct mem_cgroup *mem, 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 (p->flags & PF_KTHREAD) - continue; - if (mem && !task_in_mem_cgroup(p, mem)) + if (oom_unkillable_task(p, mem, nodemask)) continue; task = find_lock_task_mm(p); @@ -381,7 +384,7 @@ static void dump_tasks(const struct mem_cgroup *mem) } static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order, - struct mem_cgroup *mem) + struct mem_cgroup *mem, const nodemask_t *nodemask) { task_lock(current); pr_warning("%s invoked oom-killer: gfp_mask=0x%x, order=%d, " @@ -394,7 +397,7 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order, mem_cgroup_print_oom_info(mem, p); show_mem(); if (sysctl_oom_dump_tasks) - dump_tasks(mem); + dump_tasks(mem, nodemask); } #define K(x) ((x) << (PAGE_SHIFT-10)) @@ -436,7 +439,7 @@ 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); + dump_header(p, gfp_mask, order, mem, nodemask); /* * If the task is already exiting, don't alarm the sysadmin or kill @@ -482,7 +485,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, * Determines whether the kernel must panic because of the panic_on_oom sysctl. */ static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask, - int order) + int order, const nodemask_t *nodemask) { if (likely(!sysctl_panic_on_oom)) return; @@ -496,7 +499,7 @@ static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask, return; } read_lock(&tasklist_lock); - dump_header(NULL, gfp_mask, order, NULL); + dump_header(NULL, gfp_mask, order, NULL, nodemask); read_unlock(&tasklist_lock); panic("Out of memory: %s panic_on_oom is enabled\n", sysctl_panic_on_oom == 2 ? "compulsory" : "system-wide"); @@ -509,7 +512,7 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask) unsigned int points = 0; struct task_struct *p; - check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, 0); + check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, 0, NULL); limit = mem_cgroup_get_limit(mem) >> PAGE_SHIFT; read_lock(&tasklist_lock); retry: @@ -641,6 +644,7 @@ static void clear_system_oom(void) void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order, nodemask_t *nodemask) { + const nodemask_t *mpol_mask; struct task_struct *p; unsigned long totalpages; unsigned long freed = 0; @@ -670,7 +674,8 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, */ constraint = constrained_alloc(zonelist, gfp_mask, nodemask, &totalpages); - check_panic_on_oom(constraint, gfp_mask, order); + mpol_mask = (constraint == CONSTRAINT_MEMORY_POLICY) ? nodemask : NULL; + check_panic_on_oom(constraint, gfp_mask, order, mpol_mask); read_lock(&tasklist_lock); if (sysctl_oom_kill_allocating_task && @@ -688,15 +693,13 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, } retry: - p = select_bad_process(&points, totalpages, NULL, - constraint == CONSTRAINT_MEMORY_POLICY ? nodemask : - NULL); + p = select_bad_process(&points, totalpages, NULL, mpol_mask); if (PTR_ERR(p) == -1UL) goto out; /* Found nothing?!?! Either we hang forever, or we panic. */ if (!p) { - dump_header(NULL, gfp_mask, order, NULL); + dump_header(NULL, gfp_mask, order, NULL, mpol_mask); read_unlock(&tasklist_lock); panic("Out of memory and no killable processes...\n"); } diff --git a/mm/page_alloc.c b/mm/page_alloc.c index a9649f4b261e..2a362c52fdf4 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -21,6 +21,7 @@ #include <linux/pagemap.h> #include <linux/jiffies.h> #include <linux/bootmem.h> +#include <linux/memblock.h> #include <linux/compiler.h> #include <linux/kernel.h> #include <linux/kmemcheck.h> @@ -588,13 +589,13 @@ static void free_pcppages_bulk(struct zone *zone, int count, { int migratetype = 0; int batch_free = 0; + int to_free = count; spin_lock(&zone->lock); zone->all_unreclaimable = 0; zone->pages_scanned = 0; - __mod_zone_page_state(zone, NR_FREE_PAGES, count); - while (count) { + while (to_free) { struct page *page; struct list_head *list; @@ -619,8 +620,9 @@ static void free_pcppages_bulk(struct zone *zone, int count, /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */ __free_one_page(page, zone, 0, page_private(page)); trace_mm_page_pcpu_drain(page, 0, page_private(page)); - } while (--count && --batch_free && !list_empty(list)); + } while (--to_free && --batch_free && !list_empty(list)); } + __mod_zone_page_state(zone, NR_FREE_PAGES, count); spin_unlock(&zone->lock); } @@ -631,8 +633,8 @@ static void free_one_page(struct zone *zone, struct page *page, int order, zone->all_unreclaimable = 0; zone->pages_scanned = 0; - __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order); __free_one_page(page, zone, order, migratetype); + __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order); spin_unlock(&zone->lock); } @@ -1461,7 +1463,7 @@ int zone_watermark_ok(struct zone *z, int order, unsigned long mark, { /* free_pages my go negative - that's OK */ long min = mark; - long free_pages = zone_page_state(z, NR_FREE_PAGES) - (1 << order) + 1; + long free_pages = zone_nr_free_pages(z) - (1 << order) + 1; int o; if (alloc_flags & ALLOC_HIGH) @@ -1846,6 +1848,7 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, struct page *page = NULL; struct reclaim_state reclaim_state; struct task_struct *p = current; + bool drained = false; cond_resched(); @@ -1864,14 +1867,25 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, cond_resched(); - if (order != 0) - drain_all_pages(); + if (unlikely(!(*did_some_progress))) + return NULL; - if (likely(*did_some_progress)) - page = get_page_from_freelist(gfp_mask, nodemask, order, +retry: + page = get_page_from_freelist(gfp_mask, nodemask, order, zonelist, high_zoneidx, alloc_flags, preferred_zone, migratetype); + + /* + * If an allocation failed after direct reclaim, it could be because + * pages are pinned on the per-cpu lists. Drain them and try again + */ + if (!page && !drained) { + drain_all_pages(); + drained = true; + goto retry; + } + return page; } @@ -2423,7 +2437,7 @@ void show_free_areas(void) " all_unreclaimable? %s" "\n", zone->name, - K(zone_page_state(zone, NR_FREE_PAGES)), + K(zone_nr_free_pages(zone)), K(min_wmark_pages(zone)), K(low_wmark_pages(zone)), K(high_wmark_pages(zone)), @@ -3623,6 +3637,41 @@ void __init free_bootmem_with_active_regions(int nid, } } +#ifdef CONFIG_HAVE_MEMBLOCK +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(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); + + if (addr == MEMBLOCK_ERROR) + continue; + + return addr; + } + + return MEMBLOCK_ERROR; +} +#endif + int __init add_from_early_node_map(struct range *range, int az, int nr_range, int nid) { @@ -3642,46 +3691,26 @@ int __init add_from_early_node_map(struct range *range, int az, void * __init __alloc_memory_core_early(int nid, u64 size, u64 align, u64 goal, u64 limit) { - int i; void *ptr; + u64 addr; - if (limit > get_max_mapped()) - limit = get_max_mapped(); + if (limit > memblock.current_limit) + limit = memblock.current_limit; - /* need to go over early_node_map to find out good range for node */ - for_each_active_range_index_in_nid(i, nid) { - u64 addr; - u64 ei_start, ei_last; + addr = find_memory_core_early(nid, size, align, goal, limit); - ei_last = early_node_map[i].end_pfn; - ei_last <<= PAGE_SHIFT; - ei_start = early_node_map[i].start_pfn; - ei_start <<= PAGE_SHIFT; - addr = find_early_area(ei_start, ei_last, - goal, limit, size, align); - - if (addr == -1ULL) - continue; - -#if 0 - printk(KERN_DEBUG "alloc (nid=%d %llx - %llx) (%llx - %llx) %llx %llx => %llx\n", - nid, - ei_start, ei_last, goal, limit, size, - align, addr); -#endif - - ptr = phys_to_virt(addr); - memset(ptr, 0, size); - reserve_early_without_check(addr, addr + size, "BOOTMEM"); - /* - * The min_count is set to 0 so that bootmem allocated blocks - * are never reported as leaks. - */ - kmemleak_alloc(ptr, size, 0, 0); - return ptr; - } + if (addr == MEMBLOCK_ERROR) + return NULL; - return NULL; + ptr = phys_to_virt(addr); + memset(ptr, 0, size); + memblock_x86_reserve_range(addr, addr + size, "BOOTMEM"); + /* + * The min_count is set to 0 so that bootmem allocated blocks + * are never reported as leaks. + */ + kmemleak_alloc(ptr, size, 0, 0); + return ptr; } #endif @@ -5169,9 +5198,9 @@ void *__init alloc_large_system_hash(const char *tablename, if (!table) panic("Failed to allocate %s hash table\n", tablename); - printk(KERN_INFO "%s hash table entries: %d (order: %d, %lu bytes)\n", + printk(KERN_INFO "%s hash table entries: %ld (order: %d, %lu bytes)\n", tablename, - (1U << log2qty), + (1UL << log2qty), ilog2(size) - PAGE_SHIFT, size); diff --git a/mm/percpu.c b/mm/percpu.c index 12dea33572bd..6fc9015534f8 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -1258,9 +1258,9 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, if (pcpu_first_unit_cpu == NR_CPUS) pcpu_first_unit_cpu = cpu; + pcpu_last_unit_cpu = cpu; } } - pcpu_last_unit_cpu = cpu; pcpu_nr_units = unit; for_each_possible_cpu(cpu) diff --git a/mm/rmap.c b/mm/rmap.c index f6f0d2dda2ea..92e6757f196e 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -381,7 +381,13 @@ vma_address(struct page *page, struct vm_area_struct *vma) unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma) { if (PageAnon(page)) { - if (vma->anon_vma->root != page_anon_vma(page)->root) + struct anon_vma *page__anon_vma = page_anon_vma(page); + /* + * Note: swapoff's unuse_vma() is more efficient with this + * check, and needs it to match anon_vma when KSM is active. + */ + if (!vma->anon_vma || !page__anon_vma || + vma->anon_vma->root != page__anon_vma->root) return -EFAULT; } else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) { if (!vma->vm_file || @@ -1564,13 +1570,14 @@ static void __hugepage_set_anon_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address, int exclusive) { struct anon_vma *anon_vma = vma->anon_vma; + BUG_ON(!anon_vma); - if (!exclusive) { - struct anon_vma_chain *avc; - avc = list_entry(vma->anon_vma_chain.prev, - struct anon_vma_chain, same_vma); - anon_vma = avc->anon_vma; - } + + if (PageAnon(page)) + return; + if (!exclusive) + anon_vma = anon_vma->root; + anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON; page->mapping = (struct address_space *) anon_vma; page->index = linear_page_index(vma, address); @@ -1581,6 +1588,8 @@ void hugepage_add_anon_rmap(struct page *page, { struct anon_vma *anon_vma = vma->anon_vma; int first; + + BUG_ON(!PageLocked(page)); BUG_ON(!anon_vma); BUG_ON(address < vma->vm_start || address >= vma->vm_end); first = atomic_inc_and_test(&page->_mapcount); diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index aa33fd67fa41..29d6cbffb283 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -220,18 +220,7 @@ void __init sparse_mem_maps_populate_node(struct page **map_map, if (vmemmap_buf_start) { /* need to free left buf */ -#ifdef CONFIG_NO_BOOTMEM - free_early(__pa(vmemmap_buf_start), __pa(vmemmap_buf_end)); - if (vmemmap_buf_start < vmemmap_buf) { - char name[15]; - - snprintf(name, sizeof(name), "MEMMAP %d", nodeid); - reserve_early_without_check(__pa(vmemmap_buf_start), - __pa(vmemmap_buf), name); - } -#else free_bootmem(__pa(vmemmap_buf), vmemmap_buf_end - vmemmap_buf); -#endif vmemmap_buf = NULL; vmemmap_buf_end = NULL; } diff --git a/mm/swapfile.c b/mm/swapfile.c index 1f3f9c59a73a..9fc7bac7db0c 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -47,8 +47,6 @@ long nr_swap_pages; long total_swap_pages; static int least_priority; -static bool swap_for_hibernation; - static const char Bad_file[] = "Bad swap file entry "; static const char Unused_file[] = "Unused swap file entry "; static const char Bad_offset[] = "Bad swap offset entry "; @@ -141,8 +139,7 @@ static int discard_swap(struct swap_info_struct *si) nr_blocks = ((sector_t)se->nr_pages - 1) << (PAGE_SHIFT - 9); if (nr_blocks) { err = blkdev_issue_discard(si->bdev, start_block, - nr_blocks, GFP_KERNEL, - BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); + nr_blocks, GFP_KERNEL, 0); if (err) return err; cond_resched(); @@ -153,8 +150,7 @@ static int discard_swap(struct swap_info_struct *si) nr_blocks = (sector_t)se->nr_pages << (PAGE_SHIFT - 9); err = blkdev_issue_discard(si->bdev, start_block, - nr_blocks, GFP_KERNEL, - BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); + nr_blocks, GFP_KERNEL, 0); if (err) break; @@ -193,8 +189,7 @@ static void discard_swap_cluster(struct swap_info_struct *si, start_block <<= PAGE_SHIFT - 9; nr_blocks <<= PAGE_SHIFT - 9; if (blkdev_issue_discard(si->bdev, start_block, - nr_blocks, GFP_NOIO, BLKDEV_IFL_WAIT | - BLKDEV_IFL_BARRIER)) + nr_blocks, GFP_NOIO, 0)) break; } @@ -320,10 +315,8 @@ checks: if (offset > si->highest_bit) scan_base = offset = si->lowest_bit; - /* reuse swap entry of cache-only swap if not hibernation. */ - if (vm_swap_full() - && usage == SWAP_HAS_CACHE - && si->swap_map[offset] == SWAP_HAS_CACHE) { + /* reuse swap entry of cache-only swap if not busy. */ + if (vm_swap_full() && si->swap_map[offset] == SWAP_HAS_CACHE) { int swap_was_freed; spin_unlock(&swap_lock); swap_was_freed = __try_to_reclaim_swap(si, offset); @@ -453,8 +446,6 @@ swp_entry_t get_swap_page(void) spin_lock(&swap_lock); if (nr_swap_pages <= 0) goto noswap; - if (swap_for_hibernation) - goto noswap; nr_swap_pages--; for (type = swap_list.next; type >= 0 && wrapped < 2; type = next) { @@ -487,6 +478,28 @@ noswap: return (swp_entry_t) {0}; } +/* The only caller of this function is now susupend routine */ +swp_entry_t get_swap_page_of_type(int type) +{ + struct swap_info_struct *si; + pgoff_t offset; + + spin_lock(&swap_lock); + si = swap_info[type]; + if (si && (si->flags & SWP_WRITEOK)) { + nr_swap_pages--; + /* This is called for allocating swap entry, not cache */ + offset = scan_swap_map(si, 1); + if (offset) { + spin_unlock(&swap_lock); + return swp_entry(type, offset); + } + nr_swap_pages++; + } + spin_unlock(&swap_lock); + return (swp_entry_t) {0}; +} + static struct swap_info_struct *swap_info_get(swp_entry_t entry) { struct swap_info_struct *p; @@ -670,6 +683,24 @@ int try_to_free_swap(struct page *page) if (page_swapcount(page)) return 0; + /* + * Once hibernation has begun to create its image of memory, + * there's a danger that one of the calls to try_to_free_swap() + * - most probably a call from __try_to_reclaim_swap() while + * hibernation is allocating its own swap pages for the image, + * but conceivably even a call from memory reclaim - will free + * the swap from a page which has already been recorded in the + * image as a clean swapcache page, and then reuse its swap for + * another page of the image. On waking from hibernation, the + * 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. + */ + if (!(gfp_allowed_mask & __GFP_IO)) + return 0; + delete_from_swap_cache(page); SetPageDirty(page); return 1; @@ -746,74 +777,6 @@ int mem_cgroup_count_swap_user(swp_entry_t ent, struct page **pagep) #endif #ifdef CONFIG_HIBERNATION - -static pgoff_t hibernation_offset[MAX_SWAPFILES]; -/* - * Once hibernation starts to use swap, we freeze swap_map[]. Otherwise, - * saved swap_map[] image to the disk will be an incomplete because it's - * changing without synchronization with hibernation snap shot. - * At resume, we just make swap_for_hibernation=false. We can forget - * used maps easily. - */ -void hibernation_freeze_swap(void) -{ - int i; - - spin_lock(&swap_lock); - - printk(KERN_INFO "PM: Freeze Swap\n"); - swap_for_hibernation = true; - for (i = 0; i < MAX_SWAPFILES; i++) - hibernation_offset[i] = 1; - spin_unlock(&swap_lock); -} - -void hibernation_thaw_swap(void) -{ - spin_lock(&swap_lock); - if (swap_for_hibernation) { - printk(KERN_INFO "PM: Thaw Swap\n"); - swap_for_hibernation = false; - } - spin_unlock(&swap_lock); -} - -/* - * Because updateing swap_map[] can make not-saved-status-change, - * we use our own easy allocator. - * Please see kernel/power/swap.c, Used swaps are recorded into - * RB-tree. - */ -swp_entry_t get_swap_for_hibernation(int type) -{ - pgoff_t off; - swp_entry_t val = {0}; - struct swap_info_struct *si; - - spin_lock(&swap_lock); - - si = swap_info[type]; - if (!si || !(si->flags & SWP_WRITEOK)) - goto done; - - for (off = hibernation_offset[type]; off < si->max; ++off) { - if (!si->swap_map[off]) - break; - } - if (off < si->max) { - val = swp_entry(type, off); - hibernation_offset[type] = off + 1; - } -done: - spin_unlock(&swap_lock); - return val; -} - -void swap_free_for_hibernation(swp_entry_t ent) -{ - /* Nothing to do */ -} - /* * Find the swap type that corresponds to given device (if any). * @@ -2084,7 +2047,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) p->flags |= SWP_SOLIDSTATE; p->cluster_next = 1 + (random32() % p->highest_bit); } - if (discard_swap(p) == 0) + if (discard_swap(p) == 0 && (swap_flags & SWAP_FLAG_DISCARD)) p->flags |= SWP_DISCARDABLE; } diff --git a/mm/vmalloc.c b/mm/vmalloc.c index c623e0ce3f00..9f909622a25e 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -517,6 +517,15 @@ static atomic_t vmap_lazy_nr = ATOMIC_INIT(0); static void purge_fragmented_blocks_allcpus(void); /* + * called before a call to iounmap() if the caller wants vm_area_struct's + * immediately freed. + */ +void set_iounmap_nonlazy(void) +{ + atomic_set(&vmap_lazy_nr, lazy_max_pages()+1); +} + +/* * Purges all lazily-freed vmap areas. * * If sync is 0 then don't purge if there is already a purge in progress. diff --git a/mm/vmscan.c b/mm/vmscan.c index c391c320dbaf..c5dfabf25f11 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1804,12 +1804,11 @@ static void shrink_zone(int priority, struct zone *zone, * If a zone is deemed to be full of pinned pages then just give it a light * scan then give up on it. */ -static bool shrink_zones(int priority, struct zonelist *zonelist, +static void shrink_zones(int priority, struct zonelist *zonelist, struct scan_control *sc) { struct zoneref *z; struct zone *zone; - bool all_unreclaimable = true; for_each_zone_zonelist_nodemask(zone, z, zonelist, gfp_zone(sc->gfp_mask), sc->nodemask) { @@ -1827,8 +1826,38 @@ static bool shrink_zones(int priority, struct zonelist *zonelist, } shrink_zone(priority, zone, sc); - all_unreclaimable = false; } +} + +static bool zone_reclaimable(struct zone *zone) +{ + return zone->pages_scanned < zone_reclaimable_pages(zone) * 6; +} + +/* + * As hibernation is going on, kswapd is freezed so that it can't mark + * the zone into all_unreclaimable. It can't handle OOM during hibernation. + * So let's check zone's unreclaimable in direct reclaim as well as kswapd. + */ +static bool all_unreclaimable(struct zonelist *zonelist, + struct scan_control *sc) +{ + struct zoneref *z; + struct zone *zone; + bool all_unreclaimable = true; + + for_each_zone_zonelist_nodemask(zone, z, zonelist, + gfp_zone(sc->gfp_mask), sc->nodemask) { + if (!populated_zone(zone)) + continue; + if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL)) + continue; + if (zone_reclaimable(zone)) { + all_unreclaimable = false; + break; + } + } + return all_unreclaimable; } @@ -1852,7 +1881,6 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist, struct scan_control *sc) { int priority; - bool all_unreclaimable; unsigned long total_scanned = 0; struct reclaim_state *reclaim_state = current->reclaim_state; struct zoneref *z; @@ -1869,7 +1897,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist, sc->nr_scanned = 0; if (!priority) disable_swap_token(); - all_unreclaimable = shrink_zones(priority, zonelist, sc); + shrink_zones(priority, zonelist, sc); /* * Don't shrink slabs when reclaiming memory from * over limit cgroups @@ -1931,7 +1959,7 @@ out: return sc->nr_reclaimed; /* top priority shrink_zones still had more to do? don't OOM, then */ - if (scanning_global_lru(sc) && !all_unreclaimable) + if (scanning_global_lru(sc) && !all_unreclaimable(zonelist, sc)) return 1; return 0; @@ -2197,8 +2225,7 @@ loop_again: total_scanned += sc.nr_scanned; if (zone->all_unreclaimable) continue; - if (nr_slab == 0 && - zone->pages_scanned >= (zone_reclaimable_pages(zone) * 6)) + if (nr_slab == 0 && !zone_reclaimable(zone)) zone->all_unreclaimable = 1; /* * If we've done a decent amount of scanning and diff --git a/mm/vmstat.c b/mm/vmstat.c index f389168f9a83..355a9e669aaa 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -138,11 +138,24 @@ static void refresh_zone_stat_thresholds(void) int threshold; for_each_populated_zone(zone) { + unsigned long max_drift, tolerate_drift; + threshold = calculate_threshold(zone); for_each_online_cpu(cpu) per_cpu_ptr(zone->pageset, cpu)->stat_threshold = threshold; + + /* + * Only set percpu_drift_mark if there is a danger that + * NR_FREE_PAGES reports the low watermark is ok when in fact + * the min watermark could be breached by an allocation + */ + tolerate_drift = low_wmark_pages(zone) - min_wmark_pages(zone); + max_drift = num_online_cpus() * threshold; + if (max_drift > tolerate_drift) + zone->percpu_drift_mark = high_wmark_pages(zone) + + max_drift; } } @@ -813,7 +826,7 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, "\n scanned %lu" "\n spanned %lu" "\n present %lu", - zone_page_state(zone, NR_FREE_PAGES), + zone_nr_free_pages(zone), min_wmark_pages(zone), low_wmark_pages(zone), high_wmark_pages(zone), @@ -998,6 +1011,7 @@ static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, switch (action) { case CPU_ONLINE: case CPU_ONLINE_FROZEN: + refresh_zone_stat_thresholds(); start_cpu_timer(cpu); node_set_state(cpu_to_node(cpu), N_CPU); break; |