#include <linux/backing-dev.h>
#include <linux/bit_spinlock.h>
#include <linux/rcupdate.h>
+#include <linux/limits.h>
#include <linux/mutex.h>
+#include <linux/rbtree.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/spinlock.h>
struct cgroup_subsys mem_cgroup_subsys __read_mostly;
#define MEM_CGROUP_RECLAIM_RETRIES 5
+struct mem_cgroup *root_mem_cgroup __read_mostly;
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
-/* Turned on only when memory cgroup is enabled && really_do_swap_account = 0 */
+/* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */
int do_swap_account __read_mostly;
static int really_do_swap_account __initdata = 1; /* for remember boot option*/
#else
#define do_swap_account (0)
#endif
+static DEFINE_MUTEX(memcg_tasklist); /* can be hold under cgroup_mutex */
+#define SOFTLIMIT_EVENTS_THRESH (1000)
/*
* Statistics for memory cgroup.
* For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
*/
MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
- MEM_CGROUP_STAT_RSS, /* # of pages charged as rss */
+ MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
+ MEM_CGROUP_STAT_MAPPED_FILE, /* # of pages charged as file rss */
MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */
MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */
+ MEM_CGROUP_STAT_EVENTS, /* sum of pagein + pageout for internal use */
+ MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
MEM_CGROUP_STAT_NSTATS,
};
struct mem_cgroup_stat_cpu cpustat[0];
};
+static inline void
+__mem_cgroup_stat_reset_safe(struct mem_cgroup_stat_cpu *stat,
+ enum mem_cgroup_stat_index idx)
+{
+ stat->count[idx] = 0;
+}
+
+static inline s64
+__mem_cgroup_stat_read_local(struct mem_cgroup_stat_cpu *stat,
+ enum mem_cgroup_stat_index idx)
+{
+ return stat->count[idx];
+}
+
/*
* For accounting under irq disable, no need for increment preempt count.
*/
return ret;
}
+static s64 mem_cgroup_local_usage(struct mem_cgroup_stat *stat)
+{
+ s64 ret;
+
+ ret = mem_cgroup_read_stat(stat, MEM_CGROUP_STAT_CACHE);
+ ret += mem_cgroup_read_stat(stat, MEM_CGROUP_STAT_RSS);
+ return ret;
+}
+
/*
* per-zone information in memory controller.
*/
*/
struct list_head lists[NR_LRU_LISTS];
unsigned long count[NR_LRU_LISTS];
+
+ 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 */
+ /* the soft limit is exceeded*/
+ bool on_tree;
+ struct mem_cgroup *mem; /* Back pointer, we cannot */
+ /* use container_of */
};
/* Macro for accessing counter */
#define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)])
};
/*
+ * Cgroups above their limits are maintained in a RB-Tree, independent of
+ * their hierarchy representation
+ */
+
+struct mem_cgroup_tree_per_zone {
+ struct rb_root rb_root;
+ spinlock_t lock;
+};
+
+struct mem_cgroup_tree_per_node {
+ struct mem_cgroup_tree_per_zone rb_tree_per_zone[MAX_NR_ZONES];
+};
+
+struct mem_cgroup_tree {
+ struct mem_cgroup_tree_per_node *rb_tree_per_node[MAX_NUMNODES];
+};
+
+static struct mem_cgroup_tree soft_limit_tree __read_mostly;
+
+/*
* The memory controller data structure. The memory controller controls both
* page cache and RSS per cgroup. We would eventually like to provide
* statistics based on the statistics developed by Rik Van Riel for clock-pro,
*/
struct mem_cgroup_lru_info info;
+ /*
+ protect against reclaim related member.
+ */
+ spinlock_t reclaim_param_lock;
+
int prev_priority; /* for recording reclaim priority */
- int obsolete;
+
+ /*
+ * While reclaiming in a hiearchy, we cache the last child we
+ * reclaimed from.
+ */
+ int last_scanned_child;
+ /*
+ * Should the accounting and control be hierarchical, per subtree?
+ */
+ bool use_hierarchy;
+ unsigned long last_oom_jiffies;
atomic_t refcnt;
+
+ unsigned int swappiness;
+
+ /* set when res.limit == memsw.limit */
+ bool memsw_is_minimum;
+
/*
* statistics. This must be placed at the end of memcg.
*/
struct mem_cgroup_stat stat;
};
+/*
+ * Maximum loops in mem_cgroup_hierarchical_reclaim(), used for soft
+ * limit reclaim to prevent infinite loops, if they ever occur.
+ */
+#define MEM_CGROUP_MAX_RECLAIM_LOOPS (100)
+#define MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS (2)
+
enum charge_type {
MEM_CGROUP_CHARGE_TYPE_CACHE = 0,
MEM_CGROUP_CHARGE_TYPE_MAPPED,
MEM_CGROUP_CHARGE_TYPE_SHMEM, /* used by page migration of shmem */
MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */
MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */
+ MEM_CGROUP_CHARGE_TYPE_DROP, /* a page was unused swap cache */
NR_CHARGE_TYPE,
};
#define PCGF_CACHE (1UL << PCG_CACHE)
#define PCGF_USED (1UL << PCG_USED)
#define PCGF_LOCK (1UL << PCG_LOCK)
-static const unsigned long
-pcg_default_flags[NR_CHARGE_TYPE] = {
- PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* File Cache */
- PCGF_USED | PCGF_LOCK, /* Anon */
- PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* Shmem */
- 0, /* FORCE */
-};
-
+/* Not used, but added here for completeness */
+#define PCGF_ACCT (1UL << PCG_ACCT)
/* for encoding cft->private value on file */
#define _MEM (0)
#define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff)
#define MEMFILE_ATTR(val) ((val) & 0xffff)
+/*
+ * Reclaim flags for mem_cgroup_hierarchical_reclaim
+ */
+#define MEM_CGROUP_RECLAIM_NOSWAP_BIT 0x0
+#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 *mem);
static void mem_cgroup_put(struct mem_cgroup *mem);
+static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
+
+static struct mem_cgroup_per_zone *
+mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid)
+{
+ return &mem->info.nodeinfo[nid]->zoneinfo[zid];
+}
+
+static struct mem_cgroup_per_zone *
+page_cgroup_zoneinfo(struct page_cgroup *pc)
+{
+ struct mem_cgroup *mem = pc->mem_cgroup;
+ int nid = page_cgroup_nid(pc);
+ int zid = page_cgroup_zid(pc);
+
+ if (!mem)
+ return NULL;
+
+ return mem_cgroup_zoneinfo(mem, nid, zid);
+}
+
+static struct mem_cgroup_tree_per_zone *
+soft_limit_tree_node_zone(int nid, int zid)
+{
+ return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid];
+}
+
+static struct mem_cgroup_tree_per_zone *
+soft_limit_tree_from_page(struct page *page)
+{
+ int nid = page_to_nid(page);
+ int zid = page_zonenum(page);
+
+ return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid];
+}
+
+static void
+__mem_cgroup_insert_exceeded(struct mem_cgroup *mem,
+ struct mem_cgroup_per_zone *mz,
+ struct mem_cgroup_tree_per_zone *mctz,
+ unsigned long long new_usage_in_excess)
+{
+ struct rb_node **p = &mctz->rb_root.rb_node;
+ struct rb_node *parent = NULL;
+ struct mem_cgroup_per_zone *mz_node;
+
+ if (mz->on_tree)
+ return;
+
+ mz->usage_in_excess = new_usage_in_excess;
+ if (!mz->usage_in_excess)
+ return;
+ while (*p) {
+ parent = *p;
+ mz_node = rb_entry(parent, struct mem_cgroup_per_zone,
+ tree_node);
+ if (mz->usage_in_excess < mz_node->usage_in_excess)
+ p = &(*p)->rb_left;
+ /*
+ * We can't avoid mem cgroups that are over their soft
+ * limit by the same amount
+ */
+ else if (mz->usage_in_excess >= mz_node->usage_in_excess)
+ p = &(*p)->rb_right;
+ }
+ rb_link_node(&mz->tree_node, parent, p);
+ rb_insert_color(&mz->tree_node, &mctz->rb_root);
+ mz->on_tree = true;
+}
+
+static void
+__mem_cgroup_remove_exceeded(struct mem_cgroup *mem,
+ struct mem_cgroup_per_zone *mz,
+ struct mem_cgroup_tree_per_zone *mctz)
+{
+ if (!mz->on_tree)
+ return;
+ rb_erase(&mz->tree_node, &mctz->rb_root);
+ mz->on_tree = false;
+}
+
+static void
+mem_cgroup_remove_exceeded(struct mem_cgroup *mem,
+ struct mem_cgroup_per_zone *mz,
+ struct mem_cgroup_tree_per_zone *mctz)
+{
+ spin_lock(&mctz->lock);
+ __mem_cgroup_remove_exceeded(mem, mz, mctz);
+ spin_unlock(&mctz->lock);
+}
+
+static bool mem_cgroup_soft_limit_check(struct mem_cgroup *mem)
+{
+ bool ret = false;
+ int cpu;
+ s64 val;
+ struct mem_cgroup_stat_cpu *cpustat;
+
+ cpu = get_cpu();
+ cpustat = &mem->stat.cpustat[cpu];
+ val = __mem_cgroup_stat_read_local(cpustat, MEM_CGROUP_STAT_EVENTS);
+ if (unlikely(val > SOFTLIMIT_EVENTS_THRESH)) {
+ __mem_cgroup_stat_reset_safe(cpustat, MEM_CGROUP_STAT_EVENTS);
+ ret = true;
+ }
+ put_cpu();
+ return ret;
+}
+
+static void mem_cgroup_update_tree(struct mem_cgroup *mem, struct page *page)
+{
+ unsigned long long excess;
+ struct mem_cgroup_per_zone *mz;
+ struct mem_cgroup_tree_per_zone *mctz;
+ int nid = page_to_nid(page);
+ int zid = page_zonenum(page);
+ mctz = soft_limit_tree_from_page(page);
+
+ /*
+ * Necessary to update all ancestors when hierarchy is used.
+ * because their event counter is not touched.
+ */
+ for (; mem; mem = parent_mem_cgroup(mem)) {
+ mz = mem_cgroup_zoneinfo(mem, nid, zid);
+ excess = res_counter_soft_limit_excess(&mem->res);
+ /*
+ * We have to update the tree if mz is on RB-tree or
+ * mem is over its softlimit.
+ */
+ if (excess || mz->on_tree) {
+ spin_lock(&mctz->lock);
+ /* if on-tree, remove it */
+ if (mz->on_tree)
+ __mem_cgroup_remove_exceeded(mem, mz, mctz);
+ /*
+ * Insert again. mz->usage_in_excess will be updated.
+ * If excess is 0, no tree ops.
+ */
+ __mem_cgroup_insert_exceeded(mem, mz, mctz, excess);
+ spin_unlock(&mctz->lock);
+ }
+ }
+}
+
+static void mem_cgroup_remove_from_trees(struct mem_cgroup *mem)
+{
+ int node, zone;
+ struct mem_cgroup_per_zone *mz;
+ struct mem_cgroup_tree_per_zone *mctz;
+
+ for_each_node_state(node, N_POSSIBLE) {
+ for (zone = 0; zone < MAX_NR_ZONES; zone++) {
+ mz = mem_cgroup_zoneinfo(mem, node, zone);
+ mctz = soft_limit_tree_node_zone(node, zone);
+ mem_cgroup_remove_exceeded(mem, mz, mctz);
+ }
+ }
+}
+
+static inline unsigned long mem_cgroup_get_excess(struct mem_cgroup *mem)
+{
+ return res_counter_soft_limit_excess(&mem->res) >> PAGE_SHIFT;
+}
+
+static struct mem_cgroup_per_zone *
+__mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
+{
+ struct rb_node *rightmost = NULL;
+ struct mem_cgroup_per_zone *mz;
+
+retry:
+ mz = NULL;
+ rightmost = rb_last(&mctz->rb_root);
+ if (!rightmost)
+ goto done; /* Nothing to reclaim from */
+
+ mz = rb_entry(rightmost, struct mem_cgroup_per_zone, tree_node);
+ /*
+ * Remove the node now but someone else can add it back,
+ * we will to add it back at the end of reclaim to its correct
+ * position in the tree.
+ */
+ __mem_cgroup_remove_exceeded(mz->mem, mz, mctz);
+ if (!res_counter_soft_limit_excess(&mz->mem->res) ||
+ !css_tryget(&mz->mem->css))
+ goto retry;
+done:
+ return mz;
+}
+
+static struct mem_cgroup_per_zone *
+mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
+{
+ struct mem_cgroup_per_zone *mz;
+
+ spin_lock(&mctz->lock);
+ mz = __mem_cgroup_largest_soft_limit_node(mctz);
+ spin_unlock(&mctz->lock);
+ return mz;
+}
+
+static void mem_cgroup_swap_statistics(struct mem_cgroup *mem,
+ bool charge)
+{
+ int val = (charge) ? 1 : -1;
+ struct mem_cgroup_stat *stat = &mem->stat;
+ struct mem_cgroup_stat_cpu *cpustat;
+ int cpu = get_cpu();
+
+ cpustat = &stat->cpustat[cpu];
+ __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_SWAPOUT, val);
+ put_cpu();
+}
static void mem_cgroup_charge_statistics(struct mem_cgroup *mem,
struct page_cgroup *pc,
bool charge)
{
- int val = (charge)? 1 : -1;
+ int val = (charge) ? 1 : -1;
struct mem_cgroup_stat *stat = &mem->stat;
struct mem_cgroup_stat_cpu *cpustat;
int cpu = get_cpu();
else
__mem_cgroup_stat_add_safe(cpustat,
MEM_CGROUP_STAT_PGPGOUT_COUNT, 1);
+ __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_EVENTS, 1);
put_cpu();
}
-static struct mem_cgroup_per_zone *
-mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid)
-{
- return &mem->info.nodeinfo[nid]->zoneinfo[zid];
-}
-
-static struct mem_cgroup_per_zone *
-page_cgroup_zoneinfo(struct page_cgroup *pc)
-{
- struct mem_cgroup *mem = pc->mem_cgroup;
- int nid = page_cgroup_nid(pc);
- int zid = page_cgroup_zid(pc);
-
- return mem_cgroup_zoneinfo(mem, nid, zid);
-}
-
-static unsigned long mem_cgroup_get_all_zonestat(struct mem_cgroup *mem,
+static unsigned long mem_cgroup_get_local_zonestat(struct mem_cgroup *mem,
enum lru_list idx)
{
int nid, zid;
struct mem_cgroup, css);
}
+static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
+{
+ struct mem_cgroup *mem = NULL;
+
+ if (!mm)
+ return NULL;
+ /*
+ * Because we have no locks, mm->owner's may be being moved to other
+ * cgroup. We use css_tryget() here even if this looks
+ * pessimistic (rather than adding locks here).
+ */
+ rcu_read_lock();
+ do {
+ mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
+ if (unlikely(!mem))
+ break;
+ } while (!css_tryget(&mem->css));
+ rcu_read_unlock();
+ return mem;
+}
+
+/*
+ * Call callback function against all cgroup under hierarchy tree.
+ */
+static int mem_cgroup_walk_tree(struct mem_cgroup *root, void *data,
+ int (*func)(struct mem_cgroup *, void *))
+{
+ int found, ret, nextid;
+ struct cgroup_subsys_state *css;
+ struct mem_cgroup *mem;
+
+ if (!root->use_hierarchy)
+ return (*func)(root, data);
+
+ nextid = 1;
+ do {
+ ret = 0;
+ mem = NULL;
+
+ rcu_read_lock();
+ css = css_get_next(&mem_cgroup_subsys, nextid, &root->css,
+ &found);
+ if (css && css_tryget(css))
+ mem = container_of(css, struct mem_cgroup, css);
+ rcu_read_unlock();
+
+ if (mem) {
+ ret = (*func)(mem, data);
+ css_put(&mem->css);
+ }
+ nextid = found + 1;
+ } while (!ret && css);
+
+ return ret;
+}
+
+static inline bool mem_cgroup_is_root(struct mem_cgroup *mem)
+{
+ return (mem == root_mem_cgroup);
+}
+
/*
* Following LRU functions are allowed to be used without PCG_LOCK.
* Operations are called by routine of global LRU independently from memcg.
void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru)
{
struct page_cgroup *pc;
- struct mem_cgroup *mem;
struct mem_cgroup_per_zone *mz;
if (mem_cgroup_disabled())
return;
pc = lookup_page_cgroup(page);
/* can happen while we handle swapcache. */
- if (list_empty(&pc->lru))
+ 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 = pc->mem_cgroup;
MEM_CGROUP_ZSTAT(mz, lru) -= 1;
+ if (mem_cgroup_is_root(pc->mem_cgroup))
+ return;
+ VM_BUG_ON(list_empty(&pc->lru));
list_del_init(&pc->lru);
return;
}
return;
pc = lookup_page_cgroup(page);
+ /*
+ * Used bit is set without atomic ops but after smp_wmb().
+ * For making pc->mem_cgroup visible, insert smp_rmb() here.
+ */
smp_rmb();
- /* unused page is not rotated. */
- if (!PageCgroupUsed(pc))
+ /* unused or root page is not rotated. */
+ if (!PageCgroupUsed(pc) || mem_cgroup_is_root(pc->mem_cgroup))
return;
mz = page_cgroup_zoneinfo(pc);
list_move(&pc->lru, &mz->lists[lru]);
if (mem_cgroup_disabled())
return;
pc = lookup_page_cgroup(page);
- /* barrier to sync with "charge" */
+ VM_BUG_ON(PageCgroupAcctLRU(pc));
+ /*
+ * Used bit is set without atomic ops but after smp_wmb().
+ * For making pc->mem_cgroup visible, insert smp_rmb() here.
+ */
smp_rmb();
if (!PageCgroupUsed(pc))
return;
mz = page_cgroup_zoneinfo(pc);
MEM_CGROUP_ZSTAT(mz, lru) += 1;
+ SetPageCgroupAcctLRU(pc);
+ if (mem_cgroup_is_root(pc->mem_cgroup))
+ return;
list_add(&pc->lru, &mz->lists[lru]);
}
+
/*
- * To add swapcache into LRU. Be careful to all this function.
- * zone->lru_lock shouldn't be held and irq must not be disabled.
+ * At handling SwapCache, pc->mem_cgroup may be changed while it's linked to
+ * lru because the page may.be reused after it's fully uncharged (because of
+ * SwapCache behavior).To handle that, unlink page_cgroup from LRU when charge
+ * it again. This function is only used to charge SwapCache. It's done under
+ * lock_page and expected that zone->lru_lock is never held.
*/
-static void mem_cgroup_lru_fixup(struct page *page)
+static void mem_cgroup_lru_del_before_commit_swapcache(struct page *page)
{
- if (!isolate_lru_page(page))
- putback_lru_page(page);
+ unsigned long flags;
+ struct zone *zone = page_zone(page);
+ struct page_cgroup *pc = lookup_page_cgroup(page);
+
+ 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);
+}
+
+static void mem_cgroup_lru_add_after_commit_swapcache(struct page *page)
+{
+ unsigned long flags;
+ struct zone *zone = page_zone(page);
+ struct page_cgroup *pc = lookup_page_cgroup(page);
+
+ 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_add_lru_list(page, to);
}
-int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
+int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
+{
+ int ret;
+ struct mem_cgroup *curr = NULL;
+
+ task_lock(task);
+ rcu_read_lock();
+ curr = try_get_mem_cgroup_from_mm(task->mm);
+ rcu_read_unlock();
+ task_unlock(task);
+ if (!curr)
+ return 0;
+ if (curr->use_hierarchy)
+ ret = css_is_ancestor(&curr->css, &mem->css);
+ else
+ ret = (curr == mem);
+ css_put(&curr->css);
+ return ret;
+}
+
+/*
+ * prev_priority control...this will be used in memory reclaim path.
+ */
+int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
+{
+ int prev_priority;
+
+ spin_lock(&mem->reclaim_param_lock);
+ prev_priority = mem->prev_priority;
+ spin_unlock(&mem->reclaim_param_lock);
+
+ return prev_priority;
+}
+
+void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority)
+{
+ spin_lock(&mem->reclaim_param_lock);
+ if (priority < mem->prev_priority)
+ mem->prev_priority = priority;
+ spin_unlock(&mem->reclaim_param_lock);
+}
+
+void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority)
+{
+ spin_lock(&mem->reclaim_param_lock);
+ mem->prev_priority = priority;
+ spin_unlock(&mem->reclaim_param_lock);
+}
+
+static int calc_inactive_ratio(struct mem_cgroup *memcg, unsigned long *present_pages)
+{
+ unsigned long active;
+ unsigned long inactive;
+ unsigned long gb;
+ unsigned long inactive_ratio;
+
+ inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_ANON);
+ active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_ANON);
+
+ gb = (inactive + active) >> (30 - PAGE_SHIFT);
+ if (gb)
+ inactive_ratio = int_sqrt(10 * gb);
+ else
+ inactive_ratio = 1;
+
+ if (present_pages) {
+ present_pages[0] = inactive;
+ present_pages[1] = active;
+ }
+
+ return inactive_ratio;
+}
+
+int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
+{
+ unsigned long active;
+ unsigned long inactive;
+ unsigned long present_pages[2];
+ unsigned long inactive_ratio;
+
+ inactive_ratio = calc_inactive_ratio(memcg, present_pages);
+
+ inactive = present_pages[0];
+ active = present_pages[1];
+
+ if (inactive * inactive_ratio < active)
+ return 1;
+
+ return 0;
+}
+
+int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
+{
+ unsigned long active;
+ unsigned long inactive;
+
+ inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_FILE);
+ active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_FILE);
+
+ return (active > inactive);
+}
+
+unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
+ struct zone *zone,
+ enum lru_list lru)
+{
+ int nid = zone->zone_pgdat->node_id;
+ int zid = zone_idx(zone);
+ struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
+
+ return MEM_CGROUP_ZSTAT(mz, lru);
+}
+
+struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
+ struct zone *zone)
+{
+ int nid = zone->zone_pgdat->node_id;
+ int zid = zone_idx(zone);
+ struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
+
+ return &mz->reclaim_stat;
+}
+
+struct zone_reclaim_stat *
+mem_cgroup_get_reclaim_stat_from_page(struct page *page)
+{
+ struct page_cgroup *pc;
+ struct mem_cgroup_per_zone *mz;
+
+ if (mem_cgroup_disabled())
+ return NULL;
+
+ pc = lookup_page_cgroup(page);
+ /*
+ * Used bit is set without atomic ops but after smp_wmb().
+ * For making pc->mem_cgroup visible, insert smp_rmb() here.
+ */
+ smp_rmb();
+ if (!PageCgroupUsed(pc))
+ return NULL;
+
+ mz = page_cgroup_zoneinfo(pc);
+ if (!mz)
+ return NULL;
+
+ return &mz->reclaim_stat;
+}
+
+unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
+ struct list_head *dst,
+ unsigned long *scanned, int order,
+ int 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 = z->zone_pgdat->node_id;
+ 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;
+
+ page = pc->page;
+ if (unlikely(!PageCgroupUsed(pc)))
+ continue;
+ 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++;
+ 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;
+ return nr_taken;
+}
+
+#define mem_cgroup_from_res_counter(counter, member) \
+ container_of(counter, struct mem_cgroup, member)
+
+static bool mem_cgroup_check_under_limit(struct mem_cgroup *mem)
+{
+ if (do_swap_account) {
+ if (res_counter_check_under_limit(&mem->res) &&
+ res_counter_check_under_limit(&mem->memsw))
+ return true;
+ } else
+ if (res_counter_check_under_limit(&mem->res))
+ return true;
+ return false;
+}
+
+static unsigned int get_swappiness(struct mem_cgroup *memcg)
+{
+ struct cgroup *cgrp = memcg->css.cgroup;
+ unsigned int swappiness;
+
+ /* root ? */
+ if (cgrp->parent == NULL)
+ return vm_swappiness;
+
+ spin_lock(&memcg->reclaim_param_lock);
+ swappiness = memcg->swappiness;
+ spin_unlock(&memcg->reclaim_param_lock);
+
+ return swappiness;
+}
+
+static int mem_cgroup_count_children_cb(struct mem_cgroup *mem, void *data)
+{
+ int *val = data;
+ (*val)++;
+ return 0;
+}
+
+/**
+ * mem_cgroup_print_mem_info: Called from OOM with tasklist_lock held in read mode.
+ * @memcg: The memory cgroup that went over limit
+ * @p: Task that is going to be killed
+ *
+ * NOTE: @memcg and @p's mem_cgroup can be different when hierarchy is
+ * enabled
+ */
+void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
+{
+ struct cgroup *task_cgrp;
+ struct cgroup *mem_cgrp;
+ /*
+ * Need a buffer in BSS, can't rely on allocations. The code relies
+ * on the assumption that OOM is serialized for memory controller.
+ * If this assumption is broken, revisit this code.
+ */
+ static char memcg_name[PATH_MAX];
+ int ret;
+
+ if (!memcg)
+ return;
+
+
+ rcu_read_lock();
+
+ mem_cgrp = memcg->css.cgroup;
+ task_cgrp = task_cgroup(p, mem_cgroup_subsys_id);
+
+ ret = cgroup_path(task_cgrp, memcg_name, PATH_MAX);
+ if (ret < 0) {
+ /*
+ * Unfortunately, we are unable to convert to a useful name
+ * But we'll still print out the usage information
+ */
+ rcu_read_unlock();
+ goto done;
+ }
+ rcu_read_unlock();
+
+ printk(KERN_INFO "Task in %s killed", memcg_name);
+
+ rcu_read_lock();
+ ret = cgroup_path(mem_cgrp, memcg_name, PATH_MAX);
+ if (ret < 0) {
+ rcu_read_unlock();
+ goto done;
+ }
+ rcu_read_unlock();
+
+ /*
+ * Continues from above, so we don't need an KERN_ level
+ */
+ printk(KERN_CONT " as a result of limit of %s\n", memcg_name);
+done:
+
+ printk(KERN_INFO "memory: usage %llukB, limit %llukB, failcnt %llu\n",
+ res_counter_read_u64(&memcg->res, RES_USAGE) >> 10,
+ res_counter_read_u64(&memcg->res, RES_LIMIT) >> 10,
+ res_counter_read_u64(&memcg->res, RES_FAILCNT));
+ printk(KERN_INFO "memory+swap: usage %llukB, limit %llukB, "
+ "failcnt %llu\n",
+ res_counter_read_u64(&memcg->memsw, RES_USAGE) >> 10,
+ res_counter_read_u64(&memcg->memsw, RES_LIMIT) >> 10,
+ res_counter_read_u64(&memcg->memsw, RES_FAILCNT));
+}
+
+/*
+ * This function returns the number of memcg under hierarchy tree. Returns
+ * 1(self count) if no children.
+ */
+static int mem_cgroup_count_children(struct mem_cgroup *mem)
{
- int ret;
-
- task_lock(task);
- ret = task->mm && mm_match_cgroup(task->mm, mem);
- task_unlock(task);
- return ret;
+ int num = 0;
+ mem_cgroup_walk_tree(mem, &num, mem_cgroup_count_children_cb);
+ return num;
}
/*
- * Calculate mapped_ratio under memory controller. This will be used in
- * vmscan.c for deteremining we have to reclaim mapped pages.
+ * 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.
*/
-int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
+static struct mem_cgroup *
+mem_cgroup_select_victim(struct mem_cgroup *root_mem)
{
- long total, rss;
+ struct mem_cgroup *ret = NULL;
+ struct cgroup_subsys_state *css;
+ int nextid, found;
- /*
- * usage is recorded in bytes. But, here, we assume the number of
- * physical pages can be represented by "long" on any arch.
- */
- total = (long) (mem->res.usage >> PAGE_SHIFT) + 1L;
- rss = (long)mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS);
- return (int)((rss * 100L) / total);
+ if (!root_mem->use_hierarchy) {
+ css_get(&root_mem->css);
+ ret = root_mem;
+ }
+
+ while (!ret) {
+ rcu_read_lock();
+ nextid = root_mem->last_scanned_child + 1;
+ css = css_get_next(&mem_cgroup_subsys, nextid, &root_mem->css,
+ &found);
+ if (css && css_tryget(css))
+ ret = container_of(css, struct mem_cgroup, css);
+
+ rcu_read_unlock();
+ /* Updates scanning parameter */
+ spin_lock(&root_mem->reclaim_param_lock);
+ if (!css) {
+ /* this means start scan from ID:1 */
+ root_mem->last_scanned_child = 0;
+ } else
+ root_mem->last_scanned_child = found;
+ spin_unlock(&root_mem->reclaim_param_lock);
+ }
+
+ return ret;
}
/*
- * prev_priority control...this will be used in memory reclaim path.
+ * 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_mem is the original ancestor that we've been reclaim from.
+ *
+ * We give up and return to the caller when we visit root_mem twice.
+ * (other groups can be removed while we're walking....)
+ *
+ * If shrink==true, for avoiding to free too much, this returns immedieately.
*/
-int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
+static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
+ struct zone *zone,
+ gfp_t gfp_mask,
+ unsigned long reclaim_options)
+{
+ struct mem_cgroup *victim;
+ int ret, 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 = mem_cgroup_get_excess(root_mem);
+
+ /* If memsw_is_minimum==1, swap-out is of-no-use. */
+ if (root_mem->memsw_is_minimum)
+ noswap = true;
+
+ while (1) {
+ victim = mem_cgroup_select_victim(root_mem);
+ if (victim == root_mem) {
+ loop++;
+ 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);
+ break;
+ }
+ /*
+ * We want to do more targetted reclaim.
+ * excess >> 2 is not to excessive so as to
+ * reclaim too much, nor too less that we keep
+ * coming back to reclaim from this cgroup
+ */
+ if (total >= (excess >> 2) ||
+ (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) {
+ css_put(&victim->css);
+ break;
+ }
+ }
+ }
+ if (!mem_cgroup_local_usage(&victim->stat)) {
+ /* 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, get_swappiness(victim), zone,
+ zone->zone_pgdat->node_id);
+ else
+ ret = try_to_free_mem_cgroup_pages(victim, gfp_mask,
+ noswap, get_swappiness(victim));
+ 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_check_under_soft_limit(&root_mem->res))
+ return total;
+ } else if (mem_cgroup_check_under_limit(root_mem))
+ return 1 + total;
+ }
+ return total;
+}
+
+bool mem_cgroup_oom_called(struct task_struct *task)
{
- return mem->prev_priority;
+ bool ret = false;
+ struct mem_cgroup *mem;
+ struct mm_struct *mm;
+
+ rcu_read_lock();
+ mm = task->mm;
+ if (!mm)
+ mm = &init_mm;
+ mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
+ if (mem && time_before(jiffies, mem->last_oom_jiffies + HZ/10))
+ ret = true;
+ rcu_read_unlock();
+ return ret;
}
-void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority)
+static int record_last_oom_cb(struct mem_cgroup *mem, void *data)
{
- if (priority < mem->prev_priority)
- mem->prev_priority = priority;
+ mem->last_oom_jiffies = jiffies;
+ return 0;
}
-void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority)
+static void record_last_oom(struct mem_cgroup *mem)
{
- mem->prev_priority = priority;
+ mem_cgroup_walk_tree(mem, NULL, record_last_oom_cb);
}
/*
- * Calculate # of pages to be scanned in this priority/zone.
- * See also vmscan.c
- *
- * priority starts from "DEF_PRIORITY" and decremented in each loop.
- * (see include/linux/mmzone.h)
+ * Currently used to update mapped file statistics, but the routine can be
+ * generalized to update other statistics as well.
*/
-
-long mem_cgroup_calc_reclaim(struct mem_cgroup *mem, struct zone *zone,
- int priority, enum lru_list lru)
+void mem_cgroup_update_mapped_file_stat(struct page *page, int val)
{
- long nr_pages;
- int nid = zone->zone_pgdat->node_id;
- int zid = zone_idx(zone);
- struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(mem, nid, zid);
-
- nr_pages = MEM_CGROUP_ZSTAT(mz, lru);
-
- return (nr_pages >> priority);
-}
+ struct mem_cgroup *mem;
+ struct mem_cgroup_stat *stat;
+ struct mem_cgroup_stat_cpu *cpustat;
+ int cpu;
+ struct page_cgroup *pc;
-unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
- struct list_head *dst,
- unsigned long *scanned, int order,
- int 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 = z->zone_pgdat->node_id;
- int zid = zone_idx(z);
- struct mem_cgroup_per_zone *mz;
- int lru = LRU_FILE * !!file + !!active;
+ if (!page_is_file_cache(page))
+ return;
- BUG_ON(!mem_cont);
- mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
- src = &mz->lists[lru];
+ pc = lookup_page_cgroup(page);
+ if (unlikely(!pc))
+ return;
- scan = 0;
- list_for_each_entry_safe_reverse(pc, tmp, src, lru) {
- if (scan >= nr_to_scan)
- break;
+ lock_page_cgroup(pc);
+ mem = pc->mem_cgroup;
+ if (!mem)
+ goto done;
- page = pc->page;
- if (unlikely(!PageCgroupUsed(pc)))
- continue;
- if (unlikely(!PageLRU(page)))
- continue;
+ if (!PageCgroupUsed(pc))
+ goto done;
- scan++;
- if (__isolate_lru_page(page, mode, file) == 0) {
- list_move(&page->lru, dst);
- nr_taken++;
- }
- }
+ /*
+ * Preemption is already disabled, we don't need get_cpu()
+ */
+ cpu = smp_processor_id();
+ stat = &mem->stat;
+ cpustat = &stat->cpustat[cpu];
- *scanned = scan;
- return nr_taken;
+ __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_MAPPED_FILE, val);
+done:
+ unlock_page_cgroup(pc);
}
/*
*/
static int __mem_cgroup_try_charge(struct mm_struct *mm,
gfp_t gfp_mask, struct mem_cgroup **memcg,
- bool oom)
+ bool oom, struct page *page)
{
- struct mem_cgroup *mem;
+ struct mem_cgroup *mem, *mem_over_limit;
int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
struct res_counter *fail_res;
+
+ if (unlikely(test_thread_flag(TIF_MEMDIE))) {
+ /* Don't account this! */
+ *memcg = NULL;
+ return 0;
+ }
+
/*
* We always charge the cgroup the mm_struct belongs to.
* The mm_struct's mem_cgroup changes on task migration if the
* thread group leader migrates. It's possible that mm is not
* set, if so charge the init_mm (happens for pagecache usage).
*/
- if (likely(!*memcg)) {
- rcu_read_lock();
- mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
- if (unlikely(!mem)) {
- rcu_read_unlock();
- return 0;
- }
- /*
- * For every charge from the cgroup, increment reference count
- */
- css_get(&mem->css);
+ mem = *memcg;
+ if (likely(!mem)) {
+ mem = try_get_mem_cgroup_from_mm(mm);
*memcg = mem;
- rcu_read_unlock();
} else {
- mem = *memcg;
css_get(&mem->css);
}
+ if (unlikely(!mem))
+ return 0;
+
+ VM_BUG_ON(css_is_removed(&mem->css));
while (1) {
- int ret;
- bool noswap = false;
+ int ret = 0;
+ unsigned long flags = 0;
+ if (mem_cgroup_is_root(mem))
+ goto done;
ret = res_counter_charge(&mem->res, PAGE_SIZE, &fail_res);
if (likely(!ret)) {
if (!do_swap_account)
break;
/* mem+swap counter fails */
res_counter_uncharge(&mem->res, PAGE_SIZE);
- noswap = true;
- }
+ flags |= MEM_CGROUP_RECLAIM_NOSWAP;
+ mem_over_limit = mem_cgroup_from_res_counter(fail_res,
+ memsw);
+ } else
+ /* mem counter fails */
+ mem_over_limit = mem_cgroup_from_res_counter(fail_res,
+ res);
+
if (!(gfp_mask & __GFP_WAIT))
goto nomem;
- if (try_to_free_mem_cgroup_pages(mem, gfp_mask, noswap))
+ ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, NULL,
+ gfp_mask, flags);
+ if (ret)
continue;
/*
* current usage of the cgroup before giving up
*
*/
- if (!do_swap_account &&
- res_counter_check_under_limit(&mem->res))
- continue;
- if (do_swap_account &&
- res_counter_check_under_limit(&mem->memsw))
+ if (mem_cgroup_check_under_limit(mem_over_limit))
continue;
if (!nr_retries--) {
- if (oom)
- mem_cgroup_out_of_memory(mem, gfp_mask);
+ if (oom) {
+ mutex_lock(&memcg_tasklist);
+ mem_cgroup_out_of_memory(mem_over_limit, gfp_mask);
+ mutex_unlock(&memcg_tasklist);
+ record_last_oom(mem_over_limit);
+ }
goto nomem;
}
}
+ /*
+ * Insert ancestor (and ancestor's ancestors), to softlimit RB-tree.
+ * if they exceeds softlimit.
+ */
+ if (mem_cgroup_soft_limit_check(mem))
+ mem_cgroup_update_tree(mem, page);
+done:
return 0;
nomem:
css_put(&mem->css);
return -ENOMEM;
}
-/**
- * mem_cgroup_try_charge - get charge of PAGE_SIZE.
- * @mm: an mm_struct which is charged against. (when *memcg is NULL)
- * @gfp_mask: gfp_mask for reclaim.
- * @memcg: a pointer to memory cgroup which is charged against.
- *
- * charge against memory cgroup pointed by *memcg. if *memcg == NULL, estimated
- * memory cgroup from @mm is got and stored in *memcg.
- *
- * Returns 0 if success. -ENOMEM at failure.
- * This call can invoke OOM-Killer.
+/*
+ * A helper function to get mem_cgroup from ID. must be called under
+ * rcu_read_lock(). The caller must check css_is_removed() or some if
+ * it's concern. (dropping refcnt from swap can be called against removed
+ * memcg.)
*/
+static struct mem_cgroup *mem_cgroup_lookup(unsigned short id)
+{
+ struct cgroup_subsys_state *css;
-int mem_cgroup_try_charge(struct mm_struct *mm,
- gfp_t mask, struct mem_cgroup **memcg)
+ /* ID 0 is unused ID */
+ if (!id)
+ return NULL;
+ css = css_lookup(&mem_cgroup_subsys, id);
+ if (!css)
+ return NULL;
+ return container_of(css, struct mem_cgroup, css);
+}
+
+static struct mem_cgroup *try_get_mem_cgroup_from_swapcache(struct page *page)
{
- return __mem_cgroup_try_charge(mm, mask, memcg, true);
+ struct mem_cgroup *mem;
+ struct page_cgroup *pc;
+ unsigned short id;
+ swp_entry_t ent;
+
+ VM_BUG_ON(!PageLocked(page));
+
+ if (!PageSwapCache(page))
+ return NULL;
+
+ pc = lookup_page_cgroup(page);
+ lock_page_cgroup(pc);
+ if (PageCgroupUsed(pc)) {
+ mem = pc->mem_cgroup;
+ if (mem && !css_tryget(&mem->css))
+ mem = NULL;
+ } else {
+ ent.val = page_private(page);
+ id = lookup_swap_cgroup(ent);
+ rcu_read_lock();
+ mem = mem_cgroup_lookup(id);
+ if (mem && !css_tryget(&mem->css))
+ mem = NULL;
+ rcu_read_unlock();
+ }
+ unlock_page_cgroup(pc);
+ return mem;
}
/*
- * commit a charge got by mem_cgroup_try_charge() and makes page_cgroup to be
+ * commit a charge got by __mem_cgroup_try_charge() and makes page_cgroup to be
* USED state. If already USED, uncharge and return.
*/
lock_page_cgroup(pc);
if (unlikely(PageCgroupUsed(pc))) {
unlock_page_cgroup(pc);
- res_counter_uncharge(&mem->res, PAGE_SIZE);
- if (do_swap_account)
- res_counter_uncharge(&mem->memsw, PAGE_SIZE);
+ if (!mem_cgroup_is_root(mem)) {
+ res_counter_uncharge(&mem->res, PAGE_SIZE);
+ if (do_swap_account)
+ res_counter_uncharge(&mem->memsw, PAGE_SIZE);
+ }
css_put(&mem->css);
return;
}
+
pc->mem_cgroup = mem;
+ /*
+ * We access a page_cgroup asynchronously without lock_page_cgroup().
+ * Especially when a page_cgroup is taken from a page, pc->mem_cgroup
+ * is accessed after testing USED bit. To make pc->mem_cgroup visible
+ * before USED bit, we need memory barrier here.
+ * See mem_cgroup_add_lru_list(), etc.
+ */
smp_wmb();
- pc->flags = pcg_default_flags[ctype];
+ switch (ctype) {
+ case MEM_CGROUP_CHARGE_TYPE_CACHE:
+ case MEM_CGROUP_CHARGE_TYPE_SHMEM:
+ SetPageCgroupCache(pc);
+ SetPageCgroupUsed(pc);
+ break;
+ case MEM_CGROUP_CHARGE_TYPE_MAPPED:
+ ClearPageCgroupCache(pc);
+ SetPageCgroupUsed(pc);
+ break;
+ default:
+ break;
+ }
mem_cgroup_charge_statistics(mem, pc, true);
struct mem_cgroup_per_zone *from_mz, *to_mz;
int nid, zid;
int ret = -EBUSY;
+ struct page *page;
+ int cpu;
+ struct mem_cgroup_stat *stat;
+ struct mem_cgroup_stat_cpu *cpustat;
VM_BUG_ON(from == to);
VM_BUG_ON(PageLRU(pc->page));
if (pc->mem_cgroup != from)
goto out;
- css_put(&from->css);
- res_counter_uncharge(&from->res, PAGE_SIZE);
+ if (!mem_cgroup_is_root(from))
+ res_counter_uncharge(&from->res, PAGE_SIZE);
mem_cgroup_charge_statistics(from, pc, false);
- if (do_swap_account)
+
+ page = pc->page;
+ if (page_is_file_cache(page) && page_mapped(page)) {
+ cpu = smp_processor_id();
+ /* Update mapped_file data for mem_cgroup "from" */
+ stat = &from->stat;
+ cpustat = &stat->cpustat[cpu];
+ __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_MAPPED_FILE,
+ -1);
+
+ /* Update mapped_file data for mem_cgroup "to" */
+ stat = &to->stat;
+ cpustat = &stat->cpustat[cpu];
+ __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_MAPPED_FILE,
+ 1);
+ }
+
+ if (do_swap_account && !mem_cgroup_is_root(from))
res_counter_uncharge(&from->memsw, PAGE_SIZE);
+ css_put(&from->css);
+
+ css_get(&to->css);
pc->mem_cgroup = to;
mem_cgroup_charge_statistics(to, pc, true);
- css_get(&to->css);
ret = 0;
out:
unlock_page_cgroup(pc);
+ /*
+ * We charges against "to" which may not have any tasks. Then, "to"
+ * can be under rmdir(). But in current implementation, caller of
+ * this function is just force_empty() and it's garanteed that
+ * "to" is never removed. So, we don't check rmdir status here.
+ */
return ret;
}
parent = mem_cgroup_from_cont(pcg);
- ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false);
- if (ret)
+ ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false, page);
+ if (ret || !parent)
return ret;
- if (!get_page_unless_zero(page))
- return -EBUSY;
+ if (!get_page_unless_zero(page)) {
+ ret = -EBUSY;
+ goto uncharge;
+ }
ret = isolate_lru_page(page);
ret = mem_cgroup_move_account(pc, child, parent);
- /* drop extra refcnt by try_charge() (move_account increment one) */
- css_put(&parent->css);
putback_lru_page(page);
if (!ret) {
put_page(page);
+ /* drop extra refcnt by try_charge() */
+ css_put(&parent->css);
return 0;
}
- /* uncharge if move fails */
+
cancel:
- res_counter_uncharge(&parent->res, PAGE_SIZE);
- if (do_swap_account)
- res_counter_uncharge(&parent->memsw, PAGE_SIZE);
put_page(page);
+uncharge:
+ /* drop extra refcnt by try_charge() */
+ css_put(&parent->css);
+ /* uncharge if move fails */
+ if (!mem_cgroup_is_root(parent)) {
+ res_counter_uncharge(&parent->res, PAGE_SIZE);
+ if (do_swap_account)
+ res_counter_uncharge(&parent->memsw, PAGE_SIZE);
+ }
return ret;
}
prefetchw(pc);
mem = memcg;
- ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true);
- if (ret)
+ ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true, page);
+ if (ret || !mem)
return ret;
__mem_cgroup_commit_charge(mem, pc, ctype);
MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL);
}
+static void
+__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
+ enum charge_type ctype);
+
int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
+ struct mem_cgroup *mem = NULL;
+ int ret;
+
if (mem_cgroup_disabled())
return 0;
if (PageCompound(page))
* For GFP_NOWAIT case, the page may be pre-charged before calling
* add_to_page_cache(). (See shmem.c) check it here and avoid to call
* charge twice. (It works but has to pay a bit larger cost.)
+ * And when the page is SwapCache, it should take swap information
+ * into account. This is under lock_page() now.
*/
if (!(gfp_mask & __GFP_WAIT)) {
struct page_cgroup *pc;
unlock_page_cgroup(pc);
}
- if (unlikely(!mm))
+ if (unlikely(!mm && !mem))
mm = &init_mm;
if (page_is_file_cache(page))
return mem_cgroup_charge_common(page, mm, gfp_mask,
MEM_CGROUP_CHARGE_TYPE_CACHE, NULL);
- else
- return mem_cgroup_charge_common(page, mm, gfp_mask,
- MEM_CGROUP_CHARGE_TYPE_SHMEM, NULL);
+
+ /* shmem */
+ if (PageSwapCache(page)) {
+ ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem);
+ if (!ret)
+ __mem_cgroup_commit_charge_swapin(page, mem,
+ MEM_CGROUP_CHARGE_TYPE_SHMEM);
+ } else
+ ret = mem_cgroup_charge_common(page, mm, gfp_mask,
+ MEM_CGROUP_CHARGE_TYPE_SHMEM, mem);
+
+ return ret;
}
+/*
+ * While swap-in, try_charge -> commit or cancel, the page is locked.
+ * And when try_charge() successfully returns, one refcnt to memcg without
+ * struct page_cgroup is aquired. This refcnt will be cumsumed by
+ * "commit()" or removed by "cancel()"
+ */
int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
struct page *page,
gfp_t mask, struct mem_cgroup **ptr)
{
struct mem_cgroup *mem;
- swp_entry_t ent;
+ int ret;
if (mem_cgroup_disabled())
return 0;
if (!do_swap_account)
goto charge_cur_mm;
-
/*
* A racing thread's fault, or swapoff, may have already updated
* the pte, and even removed page from swap cache: return success
* to go on to do_swap_page()'s pte_same() test, which should fail.
- */
- if (!PageSwapCache(page))
- return 0;
-
- ent.val = page_private(page);
-
- mem = lookup_swap_cgroup(ent);
- if (!mem || mem->obsolete)
- goto charge_cur_mm;
- *ptr = mem;
- return __mem_cgroup_try_charge(NULL, mask, ptr, true);
-charge_cur_mm:
- if (unlikely(!mm))
- mm = &init_mm;
- return __mem_cgroup_try_charge(mm, mask, ptr, true);
-}
-
-#ifdef CONFIG_SWAP
-
-int mem_cgroup_cache_charge_swapin(struct page *page,
- struct mm_struct *mm, gfp_t mask, bool locked)
-{
- int ret = 0;
-
- if (mem_cgroup_disabled())
- return 0;
- if (unlikely(!mm))
- mm = &init_mm;
- if (!locked)
- lock_page(page);
- /*
- * If not locked, the page can be dropped from SwapCache until
- * we reach here.
- */
- if (PageSwapCache(page)) {
- struct mem_cgroup *mem = NULL;
- swp_entry_t ent;
-
- ent.val = page_private(page);
- if (do_swap_account) {
- mem = lookup_swap_cgroup(ent);
- if (mem && mem->obsolete)
- mem = NULL;
- if (mem)
- mm = NULL;
- }
- ret = mem_cgroup_charge_common(page, mm, mask,
- MEM_CGROUP_CHARGE_TYPE_SHMEM, mem);
-
- if (!ret && do_swap_account) {
- /* avoid double counting */
- mem = swap_cgroup_record(ent, NULL);
- if (mem) {
- res_counter_uncharge(&mem->memsw, PAGE_SIZE);
- mem_cgroup_put(mem);
- }
- }
- }
- if (!locked)
- unlock_page(page);
- /* add this page(page_cgroup) to the LRU we want. */
- mem_cgroup_lru_fixup(page);
-
+ */
+ if (!PageSwapCache(page))
+ return 0;
+ mem = try_get_mem_cgroup_from_swapcache(page);
+ if (!mem)
+ goto charge_cur_mm;
+ *ptr = mem;
+ ret = __mem_cgroup_try_charge(NULL, mask, ptr, true, page);
+ /* drop extra refcnt from tryget */
+ css_put(&mem->css);
return ret;
+charge_cur_mm:
+ if (unlikely(!mm))
+ mm = &init_mm;
+ return __mem_cgroup_try_charge(mm, mask, ptr, true, page);
}
-#endif
-void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
+static void
+__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
+ enum charge_type ctype)
{
struct page_cgroup *pc;
return;
if (!ptr)
return;
+ cgroup_exclude_rmdir(&ptr->css);
pc = lookup_page_cgroup(page);
- __mem_cgroup_commit_charge(ptr, pc, MEM_CGROUP_CHARGE_TYPE_MAPPED);
+ mem_cgroup_lru_del_before_commit_swapcache(page);
+ __mem_cgroup_commit_charge(ptr, pc, ctype);
+ mem_cgroup_lru_add_after_commit_swapcache(page);
/*
* Now swap is on-memory. This means this page may be
* counted both as mem and swap....double count.
- * Fix it by uncharging from memsw. This SwapCache is stable
- * because we're still under lock_page().
+ * Fix it by uncharging from memsw. Basically, this SwapCache is stable
+ * under lock_page(). But in do_swap_page()::memory.c, reuse_swap_page()
+ * may call delete_from_swap_cache() before reach here.
*/
- if (do_swap_account) {
+ if (do_swap_account && PageSwapCache(page)) {
swp_entry_t ent = {.val = page_private(page)};
+ unsigned short id;
struct mem_cgroup *memcg;
- memcg = swap_cgroup_record(ent, NULL);
+
+ id = swap_cgroup_record(ent, 0);
+ rcu_read_lock();
+ memcg = mem_cgroup_lookup(id);
if (memcg) {
- /* If memcg is obsolete, memcg can be != ptr */
- res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
+ /*
+ * 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);
}
-
+ rcu_read_unlock();
}
- /* add this page(page_cgroup) to the LRU we want. */
- mem_cgroup_lru_fixup(page);
+ /*
+ * At swapin, we may charge account against cgroup which has no tasks.
+ * 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);
+}
+
+void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
+{
+ __mem_cgroup_commit_charge_swapin(page, ptr,
+ MEM_CGROUP_CHARGE_TYPE_MAPPED);
}
void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem)
return;
if (!mem)
return;
- res_counter_uncharge(&mem->res, PAGE_SIZE);
- if (do_swap_account)
- res_counter_uncharge(&mem->memsw, PAGE_SIZE);
+ if (!mem_cgroup_is_root(mem)) {
+ res_counter_uncharge(&mem->res, PAGE_SIZE);
+ if (do_swap_account)
+ res_counter_uncharge(&mem->memsw, PAGE_SIZE);
+ }
css_put(&mem->css);
}
switch (ctype) {
case MEM_CGROUP_CHARGE_TYPE_MAPPED:
+ case MEM_CGROUP_CHARGE_TYPE_DROP:
if (page_mapped(page))
goto unlock_out;
break;
break;
}
- res_counter_uncharge(&mem->res, PAGE_SIZE);
- if (do_swap_account && (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT))
- res_counter_uncharge(&mem->memsw, PAGE_SIZE);
-
+ if (!mem_cgroup_is_root(mem)) {
+ res_counter_uncharge(&mem->res, PAGE_SIZE);
+ if (do_swap_account &&
+ (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT))
+ res_counter_uncharge(&mem->memsw, PAGE_SIZE);
+ }
+ if (ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT)
+ mem_cgroup_swap_statistics(mem, true);
mem_cgroup_charge_statistics(mem, pc, false);
+
ClearPageCgroupUsed(pc);
+ /*
+ * pc->mem_cgroup is not cleared here. It will be accessed when it's
+ * freed from LRU. This is safe because uncharged page is expected not
+ * to be reused (freed soon). Exception is SwapCache, it's handled by
+ * special functions.
+ */
mz = page_cgroup_zoneinfo(pc);
unlock_page_cgroup(pc);
- css_put(&mem->css);
+ if (mem_cgroup_soft_limit_check(mem))
+ mem_cgroup_update_tree(mem, page);
+ /* at swapout, this memcg will be accessed to record to swap */
+ if (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT)
+ css_put(&mem->css);
return mem;
__mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE);
}
+#ifdef CONFIG_SWAP
/*
- * called from __delete_from_swap_cache() and drop "page" account.
+ * called after __delete_from_swap_cache() and drop "page" account.
* memcg information is recorded to swap_cgroup of "ent"
*/
-void mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent)
+void
+mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout)
{
struct mem_cgroup *memcg;
+ int ctype = MEM_CGROUP_CHARGE_TYPE_SWAPOUT;
+
+ if (!swapout) /* this was a swap cache but the swap is unused ! */
+ ctype = MEM_CGROUP_CHARGE_TYPE_DROP;
+
+ memcg = __mem_cgroup_uncharge_common(page, ctype);
- memcg = __mem_cgroup_uncharge_common(page,
- MEM_CGROUP_CHARGE_TYPE_SWAPOUT);
/* record memcg information */
- if (do_swap_account && memcg) {
- swap_cgroup_record(ent, memcg);
+ if (do_swap_account && swapout && memcg) {
+ swap_cgroup_record(ent, css_id(&memcg->css));
mem_cgroup_get(memcg);
}
+ if (swapout && memcg)
+ css_put(&memcg->css);
}
+#endif
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
/*
void mem_cgroup_uncharge_swap(swp_entry_t ent)
{
struct mem_cgroup *memcg;
+ unsigned short id;
if (!do_swap_account)
return;
- memcg = swap_cgroup_record(ent, NULL);
+ id = swap_cgroup_record(ent, 0);
+ rcu_read_lock();
+ memcg = mem_cgroup_lookup(id);
if (memcg) {
- res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
+ /*
+ * We uncharge this because swap is freed.
+ * This memcg can be obsolete one. We 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);
}
+ rcu_read_unlock();
}
#endif
unlock_page_cgroup(pc);
if (mem) {
- ret = mem_cgroup_try_charge(NULL, GFP_HIGHUSER_MOVABLE, &mem);
+ ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false,
+ page);
css_put(&mem->css);
}
*ptr = mem;
if (!mem)
return;
-
+ cgroup_exclude_rmdir(&mem->css);
/* at migration success, oldpage->mapping is NULL. */
if (oldpage->mapping) {
target = oldpage;
*/
if (ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED)
mem_cgroup_uncharge_page(target);
+ /*
+ * At migration, we may charge account against cgroup which has no tasks
+ * 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(&mem->css);
}
/*
- * A call to try to shrink memory usage under specified resource controller.
- * This is typically used for page reclaiming for shmem for reducing side
- * effect of page allocation from shmem, which is used by some mem_cgroup.
+ * A call to try to shrink memory usage on charge failure at shmem's swapin.
+ * Calling hierarchical_reclaim is not enough because we should update
+ * last_oom_jiffies to prevent pagefault_out_of_memory from invoking global OOM.
+ * Moreover considering hierarchy, we should reclaim from the mem_over_limit,
+ * not from the memcg which this page would be charged to.
+ * try_charge_swapin does all of these works properly.
*/
-int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask)
+int mem_cgroup_shmem_charge_fallback(struct page *page,
+ struct mm_struct *mm,
+ gfp_t gfp_mask)
{
- struct mem_cgroup *mem;
- int progress = 0;
- int retry = MEM_CGROUP_RECLAIM_RETRIES;
+ struct mem_cgroup *mem = NULL;
+ int ret;
if (mem_cgroup_disabled())
return 0;
- if (!mm)
- return 0;
-
- rcu_read_lock();
- mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
- if (unlikely(!mem)) {
- rcu_read_unlock();
- return 0;
- }
- css_get(&mem->css);
- rcu_read_unlock();
- do {
- progress = try_to_free_mem_cgroup_pages(mem, gfp_mask, true);
- progress += res_counter_check_under_limit(&mem->res);
- } while (!progress && --retry);
+ ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem);
+ if (!ret)
+ mem_cgroup_cancel_charge_swapin(mem); /* it does !mem check */
- css_put(&mem->css);
- if (!retry)
- return -ENOMEM;
- return 0;
+ return ret;
}
static DEFINE_MUTEX(set_limit_mutex);
static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
unsigned long long val)
{
-
- int retry_count = MEM_CGROUP_RECLAIM_RETRIES;
+ int retry_count;
int progress;
u64 memswlimit;
int ret = 0;
+ int children = mem_cgroup_count_children(memcg);
+ u64 curusage, oldusage;
+
+ /*
+ * For keeping hierarchical_reclaim simple, how long we should retry
+ * is depends on callers. We set our retry-count to be function
+ * of # of children which we should visit in this loop.
+ */
+ retry_count = MEM_CGROUP_RECLAIM_RETRIES * children;
+
+ oldusage = res_counter_read_u64(&memcg->res, RES_USAGE);
while (retry_count) {
if (signal_pending(current)) {
break;
}
ret = res_counter_set_limit(&memcg->res, val);
+ if (!ret) {
+ if (memswlimit == val)
+ memcg->memsw_is_minimum = true;
+ else
+ memcg->memsw_is_minimum = false;
+ }
mutex_unlock(&set_limit_mutex);
if (!ret)
break;
- progress = try_to_free_mem_cgroup_pages(memcg,
- GFP_HIGHUSER_MOVABLE, false);
- if (!progress) retry_count--;
+ progress = mem_cgroup_hierarchical_reclaim(memcg, NULL,
+ GFP_KERNEL,
+ MEM_CGROUP_RECLAIM_SHRINK);
+ curusage = res_counter_read_u64(&memcg->res, RES_USAGE);
+ /* Usage is reduced ? */
+ if (curusage >= oldusage)
+ retry_count--;
+ else
+ oldusage = curusage;
}
+
return ret;
}
-int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg,
- unsigned long long val)
+static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg,
+ unsigned long long val)
{
- int retry_count = MEM_CGROUP_RECLAIM_RETRIES;
+ int retry_count;
u64 memlimit, oldusage, curusage;
- int ret;
-
- if (!do_swap_account)
- return -EINVAL;
+ int children = mem_cgroup_count_children(memcg);
+ int ret = -EBUSY;
+ /* see mem_cgroup_resize_res_limit */
+ retry_count = children * MEM_CGROUP_RECLAIM_RETRIES;
+ oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE);
while (retry_count) {
if (signal_pending(current)) {
ret = -EINTR;
break;
}
ret = res_counter_set_limit(&memcg->memsw, val);
+ if (!ret) {
+ if (memlimit == val)
+ memcg->memsw_is_minimum = true;
+ else
+ memcg->memsw_is_minimum = false;
+ }
mutex_unlock(&set_limit_mutex);
if (!ret)
break;
- oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE);
- try_to_free_mem_cgroup_pages(memcg, GFP_HIGHUSER_MOVABLE, true);
+ mem_cgroup_hierarchical_reclaim(memcg, NULL, 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)
retry_count--;
+ else
+ oldusage = curusage;
}
return ret;
}
+unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
+ gfp_t gfp_mask, int nid,
+ int zid)
+{
+ unsigned long nr_reclaimed = 0;
+ struct mem_cgroup_per_zone *mz, *next_mz = NULL;
+ unsigned long reclaimed;
+ int loop = 0;
+ struct mem_cgroup_tree_per_zone *mctz;
+ unsigned long long excess;
+
+ if (order > 0)
+ return 0;
+
+ mctz = soft_limit_tree_node_zone(nid, zid);
+ /*
+ * This loop can run a while, specially if mem_cgroup's continuously
+ * keep exceeding their soft limit and putting the system under
+ * pressure
+ */
+ do {
+ if (next_mz)
+ mz = next_mz;
+ else
+ mz = mem_cgroup_largest_soft_limit_node(mctz);
+ if (!mz)
+ break;
+
+ reclaimed = mem_cgroup_hierarchical_reclaim(mz->mem, zone,
+ gfp_mask,
+ MEM_CGROUP_RECLAIM_SOFT);
+ nr_reclaimed += reclaimed;
+ spin_lock(&mctz->lock);
+
+ /*
+ * If we failed to reclaim anything from this memory cgroup
+ * it is time to move on to the next cgroup
+ */
+ next_mz = NULL;
+ if (!reclaimed) {
+ do {
+ /*
+ * Loop until we find yet another one.
+ *
+ * By the time we get the soft_limit lock
+ * again, someone might have aded the
+ * group back on the RB tree. Iterate to
+ * make sure we get a different mem.
+ * mem_cgroup_largest_soft_limit_node returns
+ * NULL if no other cgroup is present on
+ * the tree
+ */
+ next_mz =
+ __mem_cgroup_largest_soft_limit_node(mctz);
+ if (next_mz == mz) {
+ css_put(&next_mz->mem->css);
+ next_mz = NULL;
+ } else /* next_mz == NULL or other memcg */
+ break;
+ } while (1);
+ }
+ __mem_cgroup_remove_exceeded(mz->mem, mz, mctz);
+ excess = res_counter_soft_limit_excess(&mz->mem->res);
+ /*
+ * One school of thought says that we should not add
+ * back the node to the tree if reclaim returns 0.
+ * But our reclaim could return 0, simply because due
+ * to priority we are exposing a smaller subset of
+ * memory to reclaim from. Consider this as a longer
+ * term TODO.
+ */
+ /* If excess == 0, no tree ops */
+ __mem_cgroup_insert_exceeded(mz->mem, mz, mctz, excess);
+ spin_unlock(&mctz->lock);
+ css_put(&mz->mem->css);
+ loop++;
+ /*
+ * Could not reclaim anything and there are no more
+ * mem cgroups to try or we seem to be looping without
+ * reclaiming anything.
+ */
+ if (!nr_reclaimed &&
+ (next_mz == NULL ||
+ loop > MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS))
+ break;
+ } while (!nr_reclaimed);
+ if (next_mz)
+ css_put(&next_mz->mem->css);
+ return nr_reclaimed;
+}
+
/*
* This routine traverse page_cgroup in given list and drop them all.
* *And* this routine doesn't reclaim page itself, just removes page_cgroup.
}
spin_unlock_irqrestore(&zone->lru_lock, flags);
- ret = mem_cgroup_move_parent(pc, mem, GFP_HIGHUSER_MOVABLE);
+ ret = mem_cgroup_move_parent(pc, mem, GFP_KERNEL);
if (ret == -ENOMEM)
break;
/* This is for making all *used* pages to be on LRU. */
lru_add_drain_all();
ret = 0;
- for_each_node_state(node, N_POSSIBLE) {
+ for_each_node_state(node, N_HIGH_MEMORY) {
for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) {
enum lru_list l;
for_each_lru(l) {
ret = -EINTR;
goto out;
}
- progress = try_to_free_mem_cgroup_pages(mem,
- GFP_HIGHUSER_MOVABLE, false);
+ progress = try_to_free_mem_cgroup_pages(mem, GFP_KERNEL,
+ false, get_swappiness(mem));
if (!progress) {
nr_retries--;
/* maybe some writeback is necessary */
- congestion_wait(WRITE, HZ/10);
+ congestion_wait(BLK_RW_ASYNC, HZ/10);
}
}
}
+static u64 mem_cgroup_hierarchy_read(struct cgroup *cont, struct cftype *cft)
+{
+ return mem_cgroup_from_cont(cont)->use_hierarchy;
+}
+
+static int mem_cgroup_hierarchy_write(struct cgroup *cont, struct cftype *cft,
+ u64 val)
+{
+ int retval = 0;
+ struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
+ struct cgroup *parent = cont->parent;
+ struct mem_cgroup *parent_mem = NULL;
+
+ if (parent)
+ parent_mem = mem_cgroup_from_cont(parent);
+
+ cgroup_lock();
+ /*
+ * If parent's use_hiearchy is set, we can't make any modifications
+ * in the child subtrees. If it is unset, then the change can
+ * occur, provided the current cgroup has no children.
+ *
+ * For the root cgroup, parent_mem is NULL, we allow value to be
+ * set if there are no children.
+ */
+ if ((!parent_mem || !parent_mem->use_hierarchy) &&
+ (val == 1 || val == 0)) {
+ if (list_empty(&cont->children))
+ mem->use_hierarchy = val;
+ else
+ retval = -EBUSY;
+ } else
+ retval = -EINVAL;
+ cgroup_unlock();
+
+ return retval;
+}
+
+struct mem_cgroup_idx_data {
+ s64 val;
+ enum mem_cgroup_stat_index idx;
+};
+
+static int
+mem_cgroup_get_idx_stat(struct mem_cgroup *mem, void *data)
+{
+ struct mem_cgroup_idx_data *d = data;
+ d->val += mem_cgroup_read_stat(&mem->stat, d->idx);
+ return 0;
+}
+
+static void
+mem_cgroup_get_recursive_idx_stat(struct mem_cgroup *mem,
+ enum mem_cgroup_stat_index idx, s64 *val)
+{
+ struct mem_cgroup_idx_data d;
+ d.idx = idx;
+ d.val = 0;
+ mem_cgroup_walk_tree(mem, &d, mem_cgroup_get_idx_stat);
+ *val = d.val;
+}
+
static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
{
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
- u64 val = 0;
+ u64 idx_val, val;
int type, name;
type = MEMFILE_TYPE(cft->private);
name = MEMFILE_ATTR(cft->private);
switch (type) {
case _MEM:
- val = res_counter_read_u64(&mem->res, name);
+ if (name == RES_USAGE && mem_cgroup_is_root(mem)) {
+ mem_cgroup_get_recursive_idx_stat(mem,
+ MEM_CGROUP_STAT_CACHE, &idx_val);
+ val = idx_val;
+ mem_cgroup_get_recursive_idx_stat(mem,
+ MEM_CGROUP_STAT_RSS, &idx_val);
+ val += idx_val;
+ val <<= PAGE_SHIFT;
+ } else
+ val = res_counter_read_u64(&mem->res, name);
break;
case _MEMSWAP:
- if (do_swap_account)
+ if (name == RES_USAGE && mem_cgroup_is_root(mem)) {
+ mem_cgroup_get_recursive_idx_stat(mem,
+ MEM_CGROUP_STAT_CACHE, &idx_val);
+ val = idx_val;
+ mem_cgroup_get_recursive_idx_stat(mem,
+ MEM_CGROUP_STAT_RSS, &idx_val);
+ val += idx_val;
+ mem_cgroup_get_recursive_idx_stat(mem,
+ MEM_CGROUP_STAT_SWAPOUT, &idx_val);
+ val <<= PAGE_SHIFT;
+ } else
val = res_counter_read_u64(&mem->memsw, name);
break;
default:
name = MEMFILE_ATTR(cft->private);
switch (name) {
case RES_LIMIT:
+ if (mem_cgroup_is_root(memcg)) { /* Can't set limit on root */
+ ret = -EINVAL;
+ break;
+ }
/* This function does all necessary parse...reuse it */
ret = res_counter_memparse_write_strategy(buffer, &val);
if (ret)
else
ret = mem_cgroup_resize_memsw_limit(memcg, val);
break;
+ case RES_SOFT_LIMIT:
+ ret = res_counter_memparse_write_strategy(buffer, &val);
+ if (ret)
+ break;
+ /*
+ * For memsw, soft limits are hard to implement in terms
+ * of semantics, for now, we support soft limits for
+ * control without swap
+ */
+ if (type == _MEM)
+ ret = res_counter_set_soft_limit(&memcg->res, val);
+ else
+ ret = -EINVAL;
+ break;
default:
ret = -EINVAL; /* should be BUG() ? */
break;
return ret;
}
+static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
+ unsigned long long *mem_limit, unsigned long long *memsw_limit)
+{
+ struct cgroup *cgroup;
+ unsigned long long min_limit, min_memsw_limit, tmp;
+
+ min_limit = res_counter_read_u64(&memcg->res, RES_LIMIT);
+ min_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
+ cgroup = memcg->css.cgroup;
+ if (!memcg->use_hierarchy)
+ goto out;
+
+ while (cgroup->parent) {
+ cgroup = cgroup->parent;
+ memcg = mem_cgroup_from_cont(cgroup);
+ if (!memcg->use_hierarchy)
+ break;
+ tmp = res_counter_read_u64(&memcg->res, RES_LIMIT);
+ min_limit = min(min_limit, tmp);
+ tmp = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
+ min_memsw_limit = min(min_memsw_limit, tmp);
+ }
+out:
+ *mem_limit = min_limit;
+ *memsw_limit = min_memsw_limit;
+ return;
+}
+
static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
{
struct mem_cgroup *mem;
res_counter_reset_failcnt(&mem->memsw);
break;
}
+
return 0;
}
-static const struct mem_cgroup_stat_desc {
- const char *msg;
- u64 unit;
-} mem_cgroup_stat_desc[] = {
- [MEM_CGROUP_STAT_CACHE] = { "cache", PAGE_SIZE, },
- [MEM_CGROUP_STAT_RSS] = { "rss", PAGE_SIZE, },
- [MEM_CGROUP_STAT_PGPGIN_COUNT] = {"pgpgin", 1, },
- [MEM_CGROUP_STAT_PGPGOUT_COUNT] = {"pgpgout", 1, },
+
+/* For read statistics */
+enum {
+ MCS_CACHE,
+ MCS_RSS,
+ MCS_MAPPED_FILE,
+ MCS_PGPGIN,
+ MCS_PGPGOUT,
+ MCS_SWAP,
+ MCS_INACTIVE_ANON,
+ MCS_ACTIVE_ANON,
+ MCS_INACTIVE_FILE,
+ MCS_ACTIVE_FILE,
+ MCS_UNEVICTABLE,
+ NR_MCS_STAT,
+};
+
+struct mcs_total_stat {
+ s64 stat[NR_MCS_STAT];
+};
+
+struct {
+ char *local_name;
+ char *total_name;
+} memcg_stat_strings[NR_MCS_STAT] = {
+ {"cache", "total_cache"},
+ {"rss", "total_rss"},
+ {"mapped_file", "total_mapped_file"},
+ {"pgpgin", "total_pgpgin"},
+ {"pgpgout", "total_pgpgout"},
+ {"swap", "total_swap"},
+ {"inactive_anon", "total_inactive_anon"},
+ {"active_anon", "total_active_anon"},
+ {"inactive_file", "total_inactive_file"},
+ {"active_file", "total_active_file"},
+ {"unevictable", "total_unevictable"}
};
+
+static int mem_cgroup_get_local_stat(struct mem_cgroup *mem, void *data)
+{
+ struct mcs_total_stat *s = data;
+ s64 val;
+
+ /* per cpu stat */
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_CACHE);
+ s->stat[MCS_CACHE] += val * PAGE_SIZE;
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS);
+ s->stat[MCS_RSS] += val * PAGE_SIZE;
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_MAPPED_FILE);
+ s->stat[MCS_MAPPED_FILE] += val * PAGE_SIZE;
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_PGPGIN_COUNT);
+ s->stat[MCS_PGPGIN] += val;
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_PGPGOUT_COUNT);
+ s->stat[MCS_PGPGOUT] += val;
+ if (do_swap_account) {
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_SWAPOUT);
+ s->stat[MCS_SWAP] += val * PAGE_SIZE;
+ }
+
+ /* per zone stat */
+ val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_ANON);
+ s->stat[MCS_INACTIVE_ANON] += val * PAGE_SIZE;
+ val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_ANON);
+ s->stat[MCS_ACTIVE_ANON] += val * PAGE_SIZE;
+ val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_FILE);
+ s->stat[MCS_INACTIVE_FILE] += val * PAGE_SIZE;
+ val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_FILE);
+ s->stat[MCS_ACTIVE_FILE] += val * PAGE_SIZE;
+ val = mem_cgroup_get_local_zonestat(mem, LRU_UNEVICTABLE);
+ s->stat[MCS_UNEVICTABLE] += val * PAGE_SIZE;
+ return 0;
+}
+
+static void
+mem_cgroup_get_total_stat(struct mem_cgroup *mem, struct mcs_total_stat *s)
+{
+ mem_cgroup_walk_tree(mem, s, mem_cgroup_get_local_stat);
+}
+
static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
struct cgroup_map_cb *cb)
{
struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont);
- struct mem_cgroup_stat *stat = &mem_cont->stat;
+ struct mcs_total_stat mystat;
int i;
- for (i = 0; i < ARRAY_SIZE(stat->cpustat[0].count); i++) {
- s64 val;
+ memset(&mystat, 0, sizeof(mystat));
+ mem_cgroup_get_local_stat(mem_cont, &mystat);
+
+ for (i = 0; i < NR_MCS_STAT; i++) {
+ if (i == MCS_SWAP && !do_swap_account)
+ continue;
+ cb->fill(cb, memcg_stat_strings[i].local_name, mystat.stat[i]);
+ }
+
+ /* Hierarchical information */
+ {
+ unsigned long long limit, memsw_limit;
+ memcg_get_hierarchical_limit(mem_cont, &limit, &memsw_limit);
+ cb->fill(cb, "hierarchical_memory_limit", limit);
+ if (do_swap_account)
+ cb->fill(cb, "hierarchical_memsw_limit", memsw_limit);
+ }
- val = mem_cgroup_read_stat(stat, i);
- val *= mem_cgroup_stat_desc[i].unit;
- cb->fill(cb, mem_cgroup_stat_desc[i].msg, val);
+ memset(&mystat, 0, sizeof(mystat));
+ mem_cgroup_get_total_stat(mem_cont, &mystat);
+ for (i = 0; i < NR_MCS_STAT; i++) {
+ if (i == MCS_SWAP && !do_swap_account)
+ continue;
+ cb->fill(cb, memcg_stat_strings[i].total_name, mystat.stat[i]);
}
- /* showing # of active pages */
+
+#ifdef CONFIG_DEBUG_VM
+ cb->fill(cb, "inactive_ratio", calc_inactive_ratio(mem_cont, NULL));
+
{
- unsigned long active_anon, inactive_anon;
- unsigned long active_file, inactive_file;
- unsigned long unevictable;
-
- inactive_anon = mem_cgroup_get_all_zonestat(mem_cont,
- LRU_INACTIVE_ANON);
- active_anon = mem_cgroup_get_all_zonestat(mem_cont,
- LRU_ACTIVE_ANON);
- inactive_file = mem_cgroup_get_all_zonestat(mem_cont,
- LRU_INACTIVE_FILE);
- active_file = mem_cgroup_get_all_zonestat(mem_cont,
- LRU_ACTIVE_FILE);
- unevictable = mem_cgroup_get_all_zonestat(mem_cont,
- LRU_UNEVICTABLE);
-
- cb->fill(cb, "active_anon", (active_anon) * PAGE_SIZE);
- cb->fill(cb, "inactive_anon", (inactive_anon) * PAGE_SIZE);
- cb->fill(cb, "active_file", (active_file) * PAGE_SIZE);
- cb->fill(cb, "inactive_file", (inactive_file) * PAGE_SIZE);
- cb->fill(cb, "unevictable", unevictable * PAGE_SIZE);
+ int nid, zid;
+ struct mem_cgroup_per_zone *mz;
+ unsigned long recent_rotated[2] = {0, 0};
+ unsigned long recent_scanned[2] = {0, 0};
+
+ for_each_online_node(nid)
+ for (zid = 0; zid < MAX_NR_ZONES; zid++) {
+ mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
+
+ recent_rotated[0] +=
+ mz->reclaim_stat.recent_rotated[0];
+ recent_rotated[1] +=
+ mz->reclaim_stat.recent_rotated[1];
+ recent_scanned[0] +=
+ mz->reclaim_stat.recent_scanned[0];
+ recent_scanned[1] +=
+ mz->reclaim_stat.recent_scanned[1];
+ }
+ cb->fill(cb, "recent_rotated_anon", recent_rotated[0]);
+ cb->fill(cb, "recent_rotated_file", recent_rotated[1]);
+ cb->fill(cb, "recent_scanned_anon", recent_scanned[0]);
+ cb->fill(cb, "recent_scanned_file", recent_scanned[1]);
+ }
+#endif
+
+ return 0;
+}
+
+static u64 mem_cgroup_swappiness_read(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+
+ return get_swappiness(memcg);
+}
+
+static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft,
+ u64 val)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+ struct mem_cgroup *parent;
+
+ if (val > 100)
+ return -EINVAL;
+
+ if (cgrp->parent == NULL)
+ return -EINVAL;
+ parent = mem_cgroup_from_cont(cgrp->parent);
+
+ cgroup_lock();
+
+ /* If under hierarchy, only empty-root can set this value */
+ if ((parent->use_hierarchy) ||
+ (memcg->use_hierarchy && !list_empty(&cgrp->children))) {
+ cgroup_unlock();
+ return -EINVAL;
}
+
+ spin_lock(&memcg->reclaim_param_lock);
+ memcg->swappiness = val;
+ spin_unlock(&memcg->reclaim_param_lock);
+
+ cgroup_unlock();
+
return 0;
}
.read_u64 = mem_cgroup_read,
},
{
+ .name = "soft_limit_in_bytes",
+ .private = MEMFILE_PRIVATE(_MEM, RES_SOFT_LIMIT),
+ .write_string = mem_cgroup_write,
+ .read_u64 = mem_cgroup_read,
+ },
+ {
.name = "failcnt",
.private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT),
.trigger = mem_cgroup_reset,
.name = "force_empty",
.trigger = mem_cgroup_force_empty_write,
},
+ {
+ .name = "use_hierarchy",
+ .write_u64 = mem_cgroup_hierarchy_write,
+ .read_u64 = mem_cgroup_hierarchy_read,
+ },
+ {
+ .name = "swappiness",
+ .read_u64 = mem_cgroup_swappiness_read,
+ .write_u64 = mem_cgroup_swappiness_write,
+ },
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
mz = &pn->zoneinfo[zone];
for_each_lru(l)
INIT_LIST_HEAD(&mz->lists[l]);
+ mz->usage_in_excess = 0;
+ mz->on_tree = false;
+ mz->mem = mem;
}
return 0;
}
* the number of reference from swap_cgroup and free mem_cgroup when
* it goes down to 0.
*
- * When mem_cgroup is destroyed, mem->obsolete will be set to 0 and
- * entry which points to this memcg will be ignore at swapin.
- *
* Removal of cgroup itself succeeds regardless of refs from swap.
*/
-static void mem_cgroup_free(struct mem_cgroup *mem)
+static void __mem_cgroup_free(struct mem_cgroup *mem)
{
int node;
- if (atomic_read(&mem->refcnt) > 0)
- return;
-
+ mem_cgroup_remove_from_trees(mem);
+ free_css_id(&mem_cgroup_subsys, &mem->css);
for_each_node_state(node, N_POSSIBLE)
free_mem_cgroup_per_zone_info(mem, node);
static void mem_cgroup_put(struct mem_cgroup *mem)
{
if (atomic_dec_and_test(&mem->refcnt)) {
- if (!mem->obsolete)
- return;
- mem_cgroup_free(mem);
+ struct mem_cgroup *parent = parent_mem_cgroup(mem);
+ __mem_cgroup_free(mem);
+ if (parent)
+ mem_cgroup_put(parent);
}
}
+/*
+ * Returns the parent mem_cgroup in memcgroup hierarchy with hierarchy enabled.
+ */
+static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem)
+{
+ if (!mem->res.parent)
+ return NULL;
+ return mem_cgroup_from_res_counter(mem->res.parent, res);
+}
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
static void __init enable_swap_cgroup(void)
}
#endif
-static struct cgroup_subsys_state *
+static int mem_cgroup_soft_limit_tree_init(void)
+{
+ struct mem_cgroup_tree_per_node *rtpn;
+ struct mem_cgroup_tree_per_zone *rtpz;
+ int tmp, node, zone;
+
+ for_each_node_state(node, N_POSSIBLE) {
+ tmp = node;
+ if (!node_state(node, N_NORMAL_MEMORY))
+ tmp = -1;
+ rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp);
+ if (!rtpn)
+ return 1;
+
+ soft_limit_tree.rb_tree_per_node[node] = rtpn;
+
+ for (zone = 0; zone < MAX_NR_ZONES; zone++) {
+ rtpz = &rtpn->rb_tree_per_zone[zone];
+ rtpz->rb_root = RB_ROOT;
+ spin_lock_init(&rtpz->lock);
+ }
+ }
+ return 0;
+}
+
+static struct cgroup_subsys_state * __ref
mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
{
struct mem_cgroup *mem, *parent;
+ long error = -ENOMEM;
int node;
mem = mem_cgroup_alloc();
if (!mem)
- return ERR_PTR(-ENOMEM);
+ return ERR_PTR(error);
for_each_node_state(node, N_POSSIBLE)
if (alloc_mem_cgroup_per_zone_info(mem, node))
goto free_out;
+
/* root ? */
if (cont->parent == NULL) {
enable_swap_cgroup();
parent = NULL;
- } else
- parent = mem_cgroup_from_cont(cont->parent);
+ root_mem_cgroup = mem;
+ if (mem_cgroup_soft_limit_tree_init())
+ goto free_out;
- res_counter_init(&mem->res, parent ? &parent->res : NULL);
- res_counter_init(&mem->memsw, parent ? &parent->memsw : NULL);
+ } else {
+ parent = mem_cgroup_from_cont(cont->parent);
+ mem->use_hierarchy = parent->use_hierarchy;
+ }
+ if (parent && parent->use_hierarchy) {
+ res_counter_init(&mem->res, &parent->res);
+ res_counter_init(&mem->memsw, &parent->memsw);
+ /*
+ * We increment refcnt of the parent to ensure that we can
+ * safely access it on res_counter_charge/uncharge.
+ * This refcnt will be decremented when freeing this
+ * mem_cgroup(see mem_cgroup_put).
+ */
+ mem_cgroup_get(parent);
+ } else {
+ res_counter_init(&mem->res, NULL);
+ res_counter_init(&mem->memsw, NULL);
+ }
+ mem->last_scanned_child = 0;
+ spin_lock_init(&mem->reclaim_param_lock);
+ if (parent)
+ mem->swappiness = get_swappiness(parent);
+ atomic_set(&mem->refcnt, 1);
return &mem->css;
free_out:
- for_each_node_state(node, N_POSSIBLE)
- free_mem_cgroup_per_zone_info(mem, node);
- mem_cgroup_free(mem);
- return ERR_PTR(-ENOMEM);
+ __mem_cgroup_free(mem);
+ root_mem_cgroup = NULL;
+ return ERR_PTR(error);
}
-static void mem_cgroup_pre_destroy(struct cgroup_subsys *ss,
+static int mem_cgroup_pre_destroy(struct cgroup_subsys *ss,
struct cgroup *cont)
{
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
- mem->obsolete = 1;
- mem_cgroup_force_empty(mem, false);
+
+ return mem_cgroup_force_empty(mem, false);
}
static void mem_cgroup_destroy(struct cgroup_subsys *ss,
struct cgroup *cont)
{
- mem_cgroup_free(mem_cgroup_from_cont(cont));
+ struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
+
+ mem_cgroup_put(mem);
}
static int mem_cgroup_populate(struct cgroup_subsys *ss,
static void mem_cgroup_move_task(struct cgroup_subsys *ss,
struct cgroup *cont,
struct cgroup *old_cont,
- struct task_struct *p)
+ struct task_struct *p,
+ bool threadgroup)
{
- struct mm_struct *mm;
- struct mem_cgroup *mem, *old_mem;
-
- mm = get_task_mm(p);
- if (mm == NULL)
- return;
-
- mem = mem_cgroup_from_cont(cont);
- old_mem = mem_cgroup_from_cont(old_cont);
-
+ mutex_lock(&memcg_tasklist);
/*
- * Only thread group leaders are allowed to migrate, the mm_struct is
- * in effect owned by the leader
+ * FIXME: It's better to move charges of this process from old
+ * memcg to new memcg. But it's just on TODO-List now.
*/
- if (!thread_group_leader(p))
- goto out;
-
-out:
- mmput(mm);
+ mutex_unlock(&memcg_tasklist);
}
struct cgroup_subsys mem_cgroup_subsys = {
.populate = mem_cgroup_populate,
.attach = mem_cgroup_move_task,
.early_init = 0,
+ .use_id = 1,
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff