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-rw-r--r--mm/memcontrol.c94
1 files changed, 28 insertions, 66 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 1333d25163bb..31ab2c014fa1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -137,6 +137,7 @@ struct mem_cgroup {
*/
struct mem_cgroup_stat stat;
};
+static struct mem_cgroup init_mem_cgroup;
/*
* We use the lower bit of the page->page_cgroup pointer as a bit spin
@@ -162,7 +163,7 @@ struct page_cgroup {
struct mem_cgroup *mem_cgroup;
atomic_t ref_cnt; /* Helpful when pages move b/w */
/* mapped and cached states */
- int flags;
+ int flags;
};
#define PAGE_CGROUP_FLAG_CACHE (0x1) /* charged as cache */
#define PAGE_CGROUP_FLAG_ACTIVE (0x2) /* page is active in this cgroup */
@@ -177,20 +178,11 @@ static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc)
return page_zonenum(pc->page);
}
-enum {
- MEM_CGROUP_TYPE_UNSPEC = 0,
- MEM_CGROUP_TYPE_MAPPED,
- MEM_CGROUP_TYPE_CACHED,
- MEM_CGROUP_TYPE_ALL,
- MEM_CGROUP_TYPE_MAX,
-};
-
enum charge_type {
MEM_CGROUP_CHARGE_TYPE_CACHE = 0,
MEM_CGROUP_CHARGE_TYPE_MAPPED,
};
-
/*
* Always modified under lru lock. Then, not necessary to preempt_disable()
*/
@@ -199,11 +191,10 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, int flags,
{
int val = (charge)? 1 : -1;
struct mem_cgroup_stat *stat = &mem->stat;
- VM_BUG_ON(!irqs_disabled());
+ VM_BUG_ON(!irqs_disabled());
if (flags & PAGE_CGROUP_FLAG_CACHE)
- __mem_cgroup_stat_add_safe(stat,
- MEM_CGROUP_STAT_CACHE, val);
+ __mem_cgroup_stat_add_safe(stat, MEM_CGROUP_STAT_CACHE, val);
else
__mem_cgroup_stat_add_safe(stat, MEM_CGROUP_STAT_RSS, val);
}
@@ -240,8 +231,6 @@ static unsigned long mem_cgroup_get_all_zonestat(struct mem_cgroup *mem,
return total;
}
-static struct mem_cgroup init_mem_cgroup;
-
static inline
struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
{
@@ -273,8 +262,7 @@ void mm_free_cgroup(struct mm_struct *mm)
static inline int page_cgroup_locked(struct page *page)
{
- return bit_spin_is_locked(PAGE_CGROUP_LOCK_BIT,
- &page->page_cgroup);
+ return bit_spin_is_locked(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
}
static void page_assign_page_cgroup(struct page *page, struct page_cgroup *pc)
@@ -285,8 +273,7 @@ static void page_assign_page_cgroup(struct page *page, struct page_cgroup *pc)
struct page_cgroup *page_get_page_cgroup(struct page *page)
{
- return (struct page_cgroup *)
- (page->page_cgroup & ~PAGE_CGROUP_LOCK);
+ return (struct page_cgroup *) (page->page_cgroup & ~PAGE_CGROUP_LOCK);
}
static void __always_inline lock_page_cgroup(struct page *page)
@@ -308,7 +295,6 @@ static void __always_inline unlock_page_cgroup(struct page *page)
* A can can detect failure of clearing by following
* clear_page_cgroup(page, pc) == pc
*/
-
static struct page_cgroup *clear_page_cgroup(struct page *page,
struct page_cgroup *pc)
{
@@ -417,6 +403,7 @@ int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
rss = (long)mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS);
return (int)((rss * 100L) / total);
}
+
/*
* This function is called from vmscan.c. In page reclaiming loop. balance
* between active and inactive list is calculated. For memory controller
@@ -480,7 +467,6 @@ long mem_cgroup_calc_reclaim_inactive(struct mem_cgroup *mem,
struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(mem, nid, zid);
nr_inactive = MEM_CGROUP_ZSTAT(mz, MEM_CGROUP_ZSTAT_INACTIVE);
-
return (nr_inactive >> priority);
}
@@ -601,16 +587,11 @@ retry:
rcu_read_lock();
mem = rcu_dereference(mm->mem_cgroup);
/*
- * For every charge from the cgroup, increment reference
- * count
+ * For every charge from the cgroup, increment reference count
*/
css_get(&mem->css);
rcu_read_unlock();
- /*
- * If we created the page_cgroup, we should free it on exceeding
- * the cgroup limit.
- */
while (res_counter_charge(&mem->res, PAGE_SIZE)) {
if (!(gfp_mask & __GFP_WAIT))
goto out;
@@ -619,12 +600,12 @@ retry:
continue;
/*
- * try_to_free_mem_cgroup_pages() might not give us a full
- * picture of reclaim. Some pages are reclaimed and might be
- * moved to swap cache or just unmapped from the cgroup.
- * Check the limit again to see if the reclaim reduced the
- * current usage of the cgroup before giving up
- */
+ * try_to_free_mem_cgroup_pages() might not give us a full
+ * picture of reclaim. Some pages are reclaimed and might be
+ * moved to swap cache or just unmapped from the cgroup.
+ * Check the limit again to see if the reclaim reduced the
+ * current usage of the cgroup before giving up
+ */
if (res_counter_check_under_limit(&mem->res))
continue;
@@ -660,7 +641,6 @@ retry:
mz = page_cgroup_zoneinfo(pc);
spin_lock_irqsave(&mz->lru_lock, flags);
- /* Update statistics vector */
__mem_cgroup_add_list(pc);
spin_unlock_irqrestore(&mz->lru_lock, flags);
@@ -673,26 +653,19 @@ err:
return -ENOMEM;
}
-int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
- gfp_t gfp_mask)
+int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask)
{
return mem_cgroup_charge_common(page, mm, gfp_mask,
- MEM_CGROUP_CHARGE_TYPE_MAPPED);
+ MEM_CGROUP_CHARGE_TYPE_MAPPED);
}
-/*
- * See if the cached pages should be charged at all?
- */
int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
- int ret = 0;
if (!mm)
mm = &init_mm;
-
- ret = mem_cgroup_charge_common(page, mm, gfp_mask,
+ return mem_cgroup_charge_common(page, mm, gfp_mask,
MEM_CGROUP_CHARGE_TYPE_CACHE);
- return ret;
}
/*
@@ -742,11 +715,11 @@ unlock:
* Returns non-zero if a page (under migration) has valid page_cgroup member.
* Refcnt of page_cgroup is incremented.
*/
-
int mem_cgroup_prepare_migration(struct page *page)
{
struct page_cgroup *pc;
int ret = 0;
+
lock_page_cgroup(page);
pc = page_get_page_cgroup(page);
if (pc && atomic_inc_not_zero(&pc->ref_cnt))
@@ -759,28 +732,30 @@ void mem_cgroup_end_migration(struct page *page)
{
mem_cgroup_uncharge_page(page);
}
+
/*
- * We know both *page* and *newpage* are now not-on-LRU and Pg_locked.
+ * We know both *page* and *newpage* are now not-on-LRU and PG_locked.
* And no race with uncharge() routines because page_cgroup for *page*
* has extra one reference by mem_cgroup_prepare_migration.
*/
-
void mem_cgroup_page_migration(struct page *page, struct page *newpage)
{
struct page_cgroup *pc;
struct mem_cgroup *mem;
unsigned long flags;
struct mem_cgroup_per_zone *mz;
+
retry:
pc = page_get_page_cgroup(page);
if (!pc)
return;
+
mem = pc->mem_cgroup;
mz = page_cgroup_zoneinfo(pc);
if (clear_page_cgroup(page, pc) != pc)
goto retry;
- spin_lock_irqsave(&mz->lru_lock, flags);
+ spin_lock_irqsave(&mz->lru_lock, flags);
__mem_cgroup_remove_list(pc);
spin_unlock_irqrestore(&mz->lru_lock, flags);
@@ -793,7 +768,6 @@ retry:
spin_lock_irqsave(&mz->lru_lock, flags);
__mem_cgroup_add_list(pc);
spin_unlock_irqrestore(&mz->lru_lock, flags);
- return;
}
/*
@@ -802,8 +776,7 @@ retry:
* *And* this routine doesn't reclaim page itself, just removes page_cgroup.
*/
#define FORCE_UNCHARGE_BATCH (128)
-static void
-mem_cgroup_force_empty_list(struct mem_cgroup *mem,
+static void mem_cgroup_force_empty_list(struct mem_cgroup *mem,
struct mem_cgroup_per_zone *mz,
int active)
{
@@ -837,27 +810,27 @@ retry:
} else /* being uncharged ? ...do relax */
break;
}
+
spin_unlock_irqrestore(&mz->lru_lock, flags);
if (!list_empty(list)) {
cond_resched();
goto retry;
}
- return;
}
/*
* make mem_cgroup's charge to be 0 if there is no task.
* This enables deleting this mem_cgroup.
*/
-
int mem_cgroup_force_empty(struct mem_cgroup *mem)
{
int ret = -EBUSY;
int node, zid;
+
css_get(&mem->css);
/*
* page reclaim code (kswapd etc..) will move pages between
-` * active_list <-> inactive_list while we don't take a lock.
+ * active_list <-> inactive_list while we don't take a lock.
* So, we have to do loop here until all lists are empty.
*/
while (mem->res.usage > 0) {
@@ -879,8 +852,6 @@ out:
return ret;
}
-
-
int mem_cgroup_write_strategy(char *buf, unsigned long long *tmp)
{
*tmp = memparse(buf, &buf);
@@ -918,8 +889,7 @@ static ssize_t mem_force_empty_write(struct cgroup *cont,
size_t nbytes, loff_t *ppos)
{
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
- int ret;
- ret = mem_cgroup_force_empty(mem);
+ int ret = mem_cgroup_force_empty(mem);
if (!ret)
ret = nbytes;
return ret;
@@ -928,7 +898,6 @@ static ssize_t mem_force_empty_write(struct cgroup *cont,
/*
* Note: This should be removed if cgroup supports write-only file.
*/
-
static ssize_t mem_force_empty_read(struct cgroup *cont,
struct cftype *cft,
struct file *file, char __user *userbuf,
@@ -937,7 +906,6 @@ static ssize_t mem_force_empty_read(struct cgroup *cont,
return -EINVAL;
}
-
static const struct mem_cgroup_stat_desc {
const char *msg;
u64 unit;
@@ -990,8 +958,6 @@ static int mem_control_stat_open(struct inode *unused, struct file *file)
return single_open(file, mem_control_stat_show, cont);
}
-
-
static struct cftype mem_cgroup_files[] = {
{
.name = "usage_in_bytes",
@@ -1057,9 +1023,6 @@ static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
kfree(mem->info.nodeinfo[node]);
}
-
-static struct mem_cgroup init_mem_cgroup;
-
static struct cgroup_subsys_state *
mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
{
@@ -1149,7 +1112,6 @@ static void mem_cgroup_move_task(struct cgroup_subsys *ss,
out:
mmput(mm);
- return;
}
struct cgroup_subsys mem_cgroup_subsys = {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 09:16:33 +0100