* GNU General Public License for more details.
*/
-#include <linux/res_counter.h>
+#include <linux/page_counter.h>
#include <linux/memcontrol.h>
#include <linux/cgroup.h>
#include <linux/mm.h>
unsigned long targets[MEM_CGROUP_NTARGETS];
};
-struct mem_cgroup_reclaim_iter {
- /*
- * last scanned hierarchy member. Valid only if last_dead_count
- * matches memcg->dead_count of the hierarchy root group.
- */
- struct mem_cgroup *last_visited;
- int last_dead_count;
-
+struct reclaim_iter {
+ struct mem_cgroup *position;
/* scan generation, increased every round-trip */
unsigned int generation;
};
struct lruvec lruvec;
unsigned long lru_size[NR_LRU_LISTS];
- struct mem_cgroup_reclaim_iter reclaim_iter[DEF_PRIORITY + 1];
+ struct reclaim_iter iter[DEF_PRIORITY + 1];
struct rb_node tree_node; /* RB tree node */
- unsigned long long usage_in_excess;/* Set to the value by which */
+ unsigned long usage_in_excess;/* Set to the value by which */
/* the soft limit is exceeded*/
bool on_tree;
struct mem_cgroup *memcg; /* Back pointer, we cannot */
struct mem_cgroup_threshold {
struct eventfd_ctx *eventfd;
- u64 threshold;
+ unsigned long threshold;
};
/* For threshold */
*/
struct mem_cgroup {
struct cgroup_subsys_state css;
- /*
- * the counter to account for memory usage
- */
- struct res_counter res;
+
+ /* Accounted resources */
+ struct page_counter memory;
+ struct page_counter memsw;
+ struct page_counter kmem;
+
+ unsigned long soft_limit;
/* vmpressure notifications */
struct vmpressure vmpressure;
/* css_online() has been completed */
int initialized;
- /*
- * the counter to account for mem+swap usage.
- */
- struct res_counter memsw;
-
- /*
- * the counter to account for kernel memory usage.
- */
- struct res_counter kmem;
/*
* Should the accounting and control be hierarchical, per subtree?
*/
struct mem_cgroup_stat_cpu nocpu_base;
spinlock_t pcp_counter_lock;
- atomic_t dead_count;
#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_INET)
struct cg_proto tcp_mem;
#endif
/* internal only representation about the status of kmem accounting. */
enum {
KMEM_ACCOUNTED_ACTIVE, /* accounted by this cgroup itself */
- KMEM_ACCOUNTED_DEAD, /* dead memcg with pending kmem charges */
};
#ifdef CONFIG_MEMCG_KMEM
return test_bit(KMEM_ACCOUNTED_ACTIVE, &memcg->kmem_account_flags);
}
-static void memcg_kmem_mark_dead(struct mem_cgroup *memcg)
-{
- /*
- * Our caller must use css_get() first, because memcg_uncharge_kmem()
- * will call css_put() if it sees the memcg is dead.
- */
- smp_wmb();
- if (test_bit(KMEM_ACCOUNTED_ACTIVE, &memcg->kmem_account_flags))
- set_bit(KMEM_ACCOUNTED_DEAD, &memcg->kmem_account_flags);
-}
-
-static bool memcg_kmem_test_and_clear_dead(struct mem_cgroup *memcg)
-{
- return test_and_clear_bit(KMEM_ACCOUNTED_DEAD,
- &memcg->kmem_account_flags);
-}
#endif
/* Stuffs for move charges at task migration. */
* This check can't live in kmem destruction function,
* since the charges will outlive the cgroup
*/
- WARN_ON(res_counter_read_u64(&memcg->kmem, RES_USAGE) != 0);
+ WARN_ON(page_counter_read(&memcg->kmem));
}
#else
static void disarm_kmem_keys(struct mem_cgroup *memcg)
disarm_kmem_keys(memcg);
}
-static void drain_all_stock_async(struct mem_cgroup *memcg);
-
static struct mem_cgroup_per_zone *
mem_cgroup_zone_zoneinfo(struct mem_cgroup *memcg, struct zone *zone)
{
static void __mem_cgroup_insert_exceeded(struct mem_cgroup_per_zone *mz,
struct mem_cgroup_tree_per_zone *mctz,
- unsigned long long new_usage_in_excess)
+ unsigned long new_usage_in_excess)
{
struct rb_node **p = &mctz->rb_root.rb_node;
struct rb_node *parent = NULL;
spin_unlock_irqrestore(&mctz->lock, flags);
}
+static unsigned long soft_limit_excess(struct mem_cgroup *memcg)
+{
+ unsigned long nr_pages = page_counter_read(&memcg->memory);
+ unsigned long soft_limit = ACCESS_ONCE(memcg->soft_limit);
+ unsigned long excess = 0;
+
+ if (nr_pages > soft_limit)
+ excess = nr_pages - soft_limit;
+
+ return excess;
+}
static void mem_cgroup_update_tree(struct mem_cgroup *memcg, struct page *page)
{
- unsigned long long excess;
+ unsigned long excess;
struct mem_cgroup_per_zone *mz;
struct mem_cgroup_tree_per_zone *mctz;
*/
for (; memcg; memcg = parent_mem_cgroup(memcg)) {
mz = mem_cgroup_page_zoneinfo(memcg, page);
- excess = res_counter_soft_limit_excess(&memcg->res);
+ excess = soft_limit_excess(memcg);
/*
* We have to update the tree if mz is on RB-tree or
* mem is over its softlimit.
* position in the tree.
*/
__mem_cgroup_remove_exceeded(mz, mctz);
- if (!res_counter_soft_limit_excess(&mz->memcg->res) ||
+ if (!soft_limit_excess(mz->memcg) ||
!css_tryget_online(&mz->memcg->css))
goto retry;
done:
return memcg;
}
-/*
- * Returns a next (in a pre-order walk) alive memcg (with elevated css
- * ref. count) or NULL if the whole root's subtree has been visited.
- *
- * helper function to be used by mem_cgroup_iter
- */
-static struct mem_cgroup *__mem_cgroup_iter_next(struct mem_cgroup *root,
- struct mem_cgroup *last_visited)
-{
- struct cgroup_subsys_state *prev_css, *next_css;
-
- prev_css = last_visited ? &last_visited->css : NULL;
-skip_node:
- next_css = css_next_descendant_pre(prev_css, &root->css);
-
- /*
- * Even if we found a group we have to make sure it is
- * alive. css && !memcg means that the groups should be
- * skipped and we should continue the tree walk.
- * last_visited css is safe to use because it is
- * protected by css_get and the tree walk is rcu safe.
- *
- * We do not take a reference on the root of the tree walk
- * because we might race with the root removal when it would
- * be the only node in the iterated hierarchy and mem_cgroup_iter
- * would end up in an endless loop because it expects that at
- * least one valid node will be returned. Root cannot disappear
- * because caller of the iterator should hold it already so
- * skipping css reference should be safe.
- */
- if (next_css) {
- struct mem_cgroup *memcg = mem_cgroup_from_css(next_css);
-
- if (next_css == &root->css)
- return memcg;
-
- if (css_tryget_online(next_css)) {
- /*
- * Make sure the memcg is initialized:
- * mem_cgroup_css_online() orders the the
- * initialization against setting the flag.
- */
- if (smp_load_acquire(&memcg->initialized))
- return memcg;
- css_put(next_css);
- }
-
- prev_css = next_css;
- goto skip_node;
- }
-
- return NULL;
-}
-
-static void mem_cgroup_iter_invalidate(struct mem_cgroup *root)
-{
- /*
- * When a group in the hierarchy below root is destroyed, the
- * hierarchy iterator can no longer be trusted since it might
- * have pointed to the destroyed group. Invalidate it.
- */
- atomic_inc(&root->dead_count);
-}
-
-static struct mem_cgroup *
-mem_cgroup_iter_load(struct mem_cgroup_reclaim_iter *iter,
- struct mem_cgroup *root,
- int *sequence)
-{
- struct mem_cgroup *position = NULL;
- /*
- * A cgroup destruction happens in two stages: offlining and
- * release. They are separated by a RCU grace period.
- *
- * If the iterator is valid, we may still race with an
- * offlining. The RCU lock ensures the object won't be
- * released, tryget will fail if we lost the race.
- */
- *sequence = atomic_read(&root->dead_count);
- if (iter->last_dead_count == *sequence) {
- smp_rmb();
- position = iter->last_visited;
-
- /*
- * We cannot take a reference to root because we might race
- * with root removal and returning NULL would end up in
- * an endless loop on the iterator user level when root
- * would be returned all the time.
- */
- if (position && position != root &&
- !css_tryget_online(&position->css))
- position = NULL;
- }
- return position;
-}
-
-static void mem_cgroup_iter_update(struct mem_cgroup_reclaim_iter *iter,
- struct mem_cgroup *last_visited,
- struct mem_cgroup *new_position,
- struct mem_cgroup *root,
- int sequence)
-{
- /* root reference counting symmetric to mem_cgroup_iter_load */
- if (last_visited && last_visited != root)
- css_put(&last_visited->css);
- /*
- * We store the sequence count from the time @last_visited was
- * loaded successfully instead of rereading it here so that we
- * don't lose destruction events in between. We could have
- * raced with the destruction of @new_position after all.
- */
- iter->last_visited = new_position;
- smp_wmb();
- iter->last_dead_count = sequence;
-}
-
/**
* mem_cgroup_iter - iterate over memory cgroup hierarchy
* @root: hierarchy root
struct mem_cgroup *prev,
struct mem_cgroup_reclaim_cookie *reclaim)
{
+ struct reclaim_iter *uninitialized_var(iter);
+ struct cgroup_subsys_state *css = NULL;
struct mem_cgroup *memcg = NULL;
- struct mem_cgroup *last_visited = NULL;
+ struct mem_cgroup *pos = NULL;
if (mem_cgroup_disabled())
return NULL;
root = root_mem_cgroup;
if (prev && !reclaim)
- last_visited = prev;
+ pos = prev;
if (!root->use_hierarchy && root != root_mem_cgroup) {
if (prev)
- goto out_css_put;
+ goto out;
return root;
}
rcu_read_lock();
- while (!memcg) {
- struct mem_cgroup_reclaim_iter *uninitialized_var(iter);
- int uninitialized_var(seq);
-
- if (reclaim) {
- struct mem_cgroup_per_zone *mz;
-
- mz = mem_cgroup_zone_zoneinfo(root, reclaim->zone);
- iter = &mz->reclaim_iter[reclaim->priority];
- if (prev && reclaim->generation != iter->generation) {
- iter->last_visited = NULL;
- goto out_unlock;
- }
- last_visited = mem_cgroup_iter_load(iter, root, &seq);
+ if (reclaim) {
+ struct mem_cgroup_per_zone *mz;
+
+ mz = mem_cgroup_zone_zoneinfo(root, reclaim->zone);
+ iter = &mz->iter[reclaim->priority];
+
+ if (prev && reclaim->generation != iter->generation)
+ goto out_unlock;
+
+ do {
+ pos = ACCESS_ONCE(iter->position);
+ /*
+ * A racing update may change the position and
+ * put the last reference, hence css_tryget(),
+ * or retry to see the updated position.
+ */
+ } while (pos && !css_tryget(&pos->css));
+ }
+
+ if (pos)
+ css = &pos->css;
+
+ for (;;) {
+ css = css_next_descendant_pre(css, &root->css);
+ if (!css) {
+ /*
+ * Reclaimers share the hierarchy walk, and a
+ * new one might jump in right at the end of
+ * the hierarchy - make sure they see at least
+ * one group and restart from the beginning.
+ */
+ if (!prev)
+ continue;
+ break;
}
- memcg = __mem_cgroup_iter_next(root, last_visited);
+ /*
+ * Verify the css and acquire a reference. The root
+ * is provided by the caller, so we know it's alive
+ * and kicking, and don't take an extra reference.
+ */
+ memcg = mem_cgroup_from_css(css);
- if (reclaim) {
- mem_cgroup_iter_update(iter, last_visited, memcg, root,
- seq);
+ if (css == &root->css)
+ break;
- if (!memcg)
- iter->generation++;
- else if (!prev && memcg)
- reclaim->generation = iter->generation;
+ if (css_tryget(css)) {
+ /*
+ * Make sure the memcg is initialized:
+ * mem_cgroup_css_online() orders the the
+ * initialization against setting the flag.
+ */
+ if (smp_load_acquire(&memcg->initialized))
+ break;
+
+ css_put(css);
}
- if (prev && !memcg)
- goto out_unlock;
+ memcg = NULL;
+ }
+
+ if (reclaim) {
+ if (cmpxchg(&iter->position, pos, memcg) == pos) {
+ if (memcg)
+ css_get(&memcg->css);
+ if (pos)
+ css_put(&pos->css);
+ }
+
+ /*
+ * pairs with css_tryget when dereferencing iter->position
+ * above.
+ */
+ if (pos)
+ css_put(&pos->css);
+
+ if (!memcg)
+ iter->generation++;
+ else if (!prev)
+ reclaim->generation = iter->generation;
}
+
out_unlock:
rcu_read_unlock();
-out_css_put:
+out:
if (prev && prev != root)
css_put(&prev->css);
}
/**
- * mem_cgroup_page_lruvec - return lruvec for adding an lru page
+ * mem_cgroup_page_lruvec - return lruvec for isolating/putting an LRU page
* @page: the page
* @zone: zone of the page
+ *
+ * This function is only safe when following the LRU page isolation
+ * and putback protocol: the LRU lock must be held, and the page must
+ * either be PageLRU() or the caller must have isolated/allocated it.
*/
struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct zone *zone)
{
pc = lookup_page_cgroup(page);
memcg = pc->mem_cgroup;
-
/*
- * Surreptitiously switch any uncharged offlist page to root:
- * an uncharged page off lru does nothing to secure
- * its former mem_cgroup from sudden removal.
- *
- * Our caller holds lru_lock, and PageCgroupUsed is updated
- * under page_cgroup lock: between them, they make all uses
- * of pc->mem_cgroup safe.
+ * Swapcache readahead pages are added to the LRU - and
+ * possibly migrated - before they are charged.
*/
- if (!PageLRU(page) && !PageCgroupUsed(pc) && memcg != root_mem_cgroup)
- pc->mem_cgroup = memcg = root_mem_cgroup;
+ if (!memcg)
+ memcg = root_mem_cgroup;
mz = mem_cgroup_page_zoneinfo(memcg, page);
lruvec = &mz->lruvec;
VM_BUG_ON((long)(*lru_size) < 0);
}
-/*
- * Checks whether given mem is same or in the root_mem_cgroup's
- * hierarchy subtree
- */
-bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
- struct mem_cgroup *memcg)
+bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, struct mem_cgroup *root)
{
- if (root_memcg == memcg)
+ if (root == memcg)
return true;
- if (!root_memcg->use_hierarchy || !memcg)
+ if (!root->use_hierarchy)
return false;
- return cgroup_is_descendant(memcg->css.cgroup, root_memcg->css.cgroup);
+ return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
}
-static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
- struct mem_cgroup *memcg)
+bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg)
{
- bool ret;
-
- rcu_read_lock();
- ret = __mem_cgroup_same_or_subtree(root_memcg, memcg);
- rcu_read_unlock();
- return ret;
-}
-
-bool task_in_mem_cgroup(struct task_struct *task,
- const struct mem_cgroup *memcg)
-{
- struct mem_cgroup *curr = NULL;
+ struct mem_cgroup *task_memcg;
struct task_struct *p;
bool ret;
p = find_lock_task_mm(task);
if (p) {
- curr = get_mem_cgroup_from_mm(p->mm);
+ task_memcg = get_mem_cgroup_from_mm(p->mm);
task_unlock(p);
} else {
/*
* killed to prevent needlessly killing additional tasks.
*/
rcu_read_lock();
- curr = mem_cgroup_from_task(task);
- if (curr)
- css_get(&curr->css);
+ task_memcg = mem_cgroup_from_task(task);
+ css_get(&task_memcg->css);
rcu_read_unlock();
}
- /*
- * We should check use_hierarchy of "memcg" not "curr". Because checking
- * use_hierarchy of "curr" here make this function true if hierarchy is
- * enabled in "curr" and "curr" is a child of "memcg" in *cgroup*
- * hierarchy(even if use_hierarchy is disabled in "memcg").
- */
- ret = mem_cgroup_same_or_subtree(memcg, curr);
- css_put(&curr->css);
+ ret = mem_cgroup_is_descendant(task_memcg, memcg);
+ css_put(&task_memcg->css);
return ret;
}
return inactive * inactive_ratio < active;
}
-#define mem_cgroup_from_res_counter(counter, member) \
+#define mem_cgroup_from_counter(counter, member) \
container_of(counter, struct mem_cgroup, member)
/**
*/
static unsigned long mem_cgroup_margin(struct mem_cgroup *memcg)
{
- unsigned long long margin;
+ unsigned long margin = 0;
+ unsigned long count;
+ unsigned long limit;
- margin = res_counter_margin(&memcg->res);
- if (do_swap_account)
- margin = min(margin, res_counter_margin(&memcg->memsw));
- return margin >> PAGE_SHIFT;
+ count = page_counter_read(&memcg->memory);
+ limit = ACCESS_ONCE(memcg->memory.limit);
+ if (count < limit)
+ margin = limit - count;
+
+ if (do_swap_account) {
+ count = page_counter_read(&memcg->memsw);
+ limit = ACCESS_ONCE(memcg->memsw.limit);
+ if (count <= limit)
+ margin = min(margin, limit - count);
+ }
+
+ return margin;
}
int mem_cgroup_swappiness(struct mem_cgroup *memcg)
return memcg->swappiness;
}
-/*
- * memcg->moving_account is used for checking possibility that some thread is
- * calling move_account(). When a thread on CPU-A starts moving pages under
- * a memcg, other threads should check memcg->moving_account under
- * rcu_read_lock(), like this:
- *
- * CPU-A CPU-B
- * rcu_read_lock()
- * memcg->moving_account+1 if (memcg->mocing_account)
- * take heavy locks.
- * synchronize_rcu() update something.
- * rcu_read_unlock()
- * start move here.
- */
-
-static void mem_cgroup_start_move(struct mem_cgroup *memcg)
-{
- atomic_inc(&memcg->moving_account);
- synchronize_rcu();
-}
-
-static void mem_cgroup_end_move(struct mem_cgroup *memcg)
-{
- /*
- * Now, mem_cgroup_clear_mc() may call this function with NULL.
- * We check NULL in callee rather than caller.
- */
- if (memcg)
- atomic_dec(&memcg->moving_account);
-}
-
/*
* A routine for checking "mem" is under move_account() or not.
*
if (!from)
goto unlock;
- ret = mem_cgroup_same_or_subtree(memcg, from)
- || mem_cgroup_same_or_subtree(memcg, to);
+ ret = mem_cgroup_is_descendant(from, memcg) ||
+ mem_cgroup_is_descendant(to, memcg);
unlock:
spin_unlock(&mc.lock);
return ret;
return false;
}
-/*
- * Take this lock when
- * - a code tries to modify page's memcg while it's USED.
- * - a code tries to modify page state accounting in a memcg.
- */
-static void move_lock_mem_cgroup(struct mem_cgroup *memcg,
- unsigned long *flags)
-{
- spin_lock_irqsave(&memcg->move_lock, *flags);
-}
-
-static void move_unlock_mem_cgroup(struct mem_cgroup *memcg,
- unsigned long *flags)
-{
- spin_unlock_irqrestore(&memcg->move_lock, *flags);
-}
-
#define K(x) ((x) << (PAGE_SHIFT-10))
/**
* mem_cgroup_print_oom_info: Print OOM information relevant to memory controller.
rcu_read_unlock();
- pr_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));
- pr_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));
- pr_info("kmem: usage %llukB, limit %llukB, failcnt %llu\n",
- res_counter_read_u64(&memcg->kmem, RES_USAGE) >> 10,
- res_counter_read_u64(&memcg->kmem, RES_LIMIT) >> 10,
- res_counter_read_u64(&memcg->kmem, RES_FAILCNT));
+ pr_info("memory: usage %llukB, limit %llukB, failcnt %lu\n",
+ K((u64)page_counter_read(&memcg->memory)),
+ K((u64)memcg->memory.limit), memcg->memory.failcnt);
+ pr_info("memory+swap: usage %llukB, limit %llukB, failcnt %lu\n",
+ K((u64)page_counter_read(&memcg->memsw)),
+ K((u64)memcg->memsw.limit), memcg->memsw.failcnt);
+ pr_info("kmem: usage %llukB, limit %llukB, failcnt %lu\n",
+ K((u64)page_counter_read(&memcg->kmem)),
+ K((u64)memcg->kmem.limit), memcg->kmem.failcnt);
for_each_mem_cgroup_tree(iter, memcg) {
pr_info("Memory cgroup stats for ");
/*
* Return the memory (and swap, if configured) limit for a memcg.
*/
-static u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
+static unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg)
{
- u64 limit;
-
- limit = res_counter_read_u64(&memcg->res, RES_LIMIT);
+ unsigned long limit;
- /*
- * Do not consider swap space if we cannot swap due to swappiness
- */
+ limit = memcg->memory.limit;
if (mem_cgroup_swappiness(memcg)) {
- u64 memsw;
+ unsigned long memsw_limit;
- limit += total_swap_pages << PAGE_SHIFT;
- memsw = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
-
- /*
- * If memsw is finite and limits the amount of swap space
- * available to this memcg, return that limit.
- */
- limit = min(limit, memsw);
+ memsw_limit = memcg->memsw.limit;
+ limit = min(limit + total_swap_pages, memsw_limit);
}
-
return limit;
}
}
check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL);
- totalpages = mem_cgroup_get_limit(memcg) >> PAGE_SHIFT ? : 1;
+ totalpages = mem_cgroup_get_limit(memcg) ? : 1;
for_each_mem_cgroup_tree(iter, memcg) {
struct css_task_iter it;
struct task_struct *task;
memcg->last_scanned_node = node;
return node;
}
-
-/*
- * Check all nodes whether it contains reclaimable pages or not.
- * For quick scan, we make use of scan_nodes. This will allow us to skip
- * unused nodes. But scan_nodes is lazily updated and may not cotain
- * enough new information. We need to do double check.
- */
-static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
-{
- int nid;
-
- /*
- * quick check...making use of scan_node.
- * We can skip unused nodes.
- */
- if (!nodes_empty(memcg->scan_nodes)) {
- for (nid = first_node(memcg->scan_nodes);
- nid < MAX_NUMNODES;
- nid = next_node(nid, memcg->scan_nodes)) {
-
- if (test_mem_cgroup_node_reclaimable(memcg, nid, noswap))
- return true;
- }
- }
- /*
- * Check rest of nodes.
- */
- for_each_node_state(nid, N_MEMORY) {
- if (node_isset(nid, memcg->scan_nodes))
- continue;
- if (test_mem_cgroup_node_reclaimable(memcg, nid, noswap))
- return true;
- }
- return false;
-}
-
#else
int mem_cgroup_select_victim_node(struct mem_cgroup *memcg)
{
return 0;
}
-
-static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
-{
- return test_mem_cgroup_node_reclaimable(memcg, 0, noswap);
-}
#endif
static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg,
.priority = 0,
};
- excess = res_counter_soft_limit_excess(&root_memcg->res) >> PAGE_SHIFT;
+ excess = soft_limit_excess(root_memcg);
while (1) {
victim = mem_cgroup_iter(root_memcg, victim, &reclaim);
}
continue;
}
- if (!mem_cgroup_reclaimable(victim, false))
- continue;
total += mem_cgroup_shrink_node_zone(victim, gfp_mask, false,
zone, &nr_scanned);
*total_scanned += nr_scanned;
- if (!res_counter_soft_limit_excess(&root_memcg->res))
+ if (!soft_limit_excess(root_memcg))
break;
}
mem_cgroup_iter_break(root_memcg, victim);
oom_wait_info = container_of(wait, struct oom_wait_info, wait);
oom_wait_memcg = oom_wait_info->memcg;
- /*
- * Both of oom_wait_info->memcg and wake_memcg are stable under us.
- * Then we can use css_is_ancestor without taking care of RCU.
- */
- if (!mem_cgroup_same_or_subtree(oom_wait_memcg, wake_memcg)
- && !mem_cgroup_same_or_subtree(wake_memcg, oom_wait_memcg))
+ if (!mem_cgroup_is_descendant(wake_memcg, oom_wait_memcg) &&
+ !mem_cgroup_is_descendant(oom_wait_memcg, wake_memcg))
return 0;
return autoremove_wake_function(wait, mode, sync, arg);
}
pc = lookup_page_cgroup(page);
again:
memcg = pc->mem_cgroup;
- if (unlikely(!memcg || !PageCgroupUsed(pc)))
+ if (unlikely(!memcg))
return NULL;
*locked = false;
if (atomic_read(&memcg->moving_account) <= 0)
return memcg;
- move_lock_mem_cgroup(memcg, flags);
- if (memcg != pc->mem_cgroup || !PageCgroupUsed(pc)) {
- move_unlock_mem_cgroup(memcg, flags);
+ spin_lock_irqsave(&memcg->move_lock, *flags);
+ if (memcg != pc->mem_cgroup) {
+ spin_unlock_irqrestore(&memcg->move_lock, *flags);
goto again;
}
*locked = true;
* @locked: value received from mem_cgroup_begin_page_stat()
* @flags: value received from mem_cgroup_begin_page_stat()
*/
-void mem_cgroup_end_page_stat(struct mem_cgroup *memcg, bool locked,
- unsigned long flags)
+void mem_cgroup_end_page_stat(struct mem_cgroup *memcg, bool *locked,
+ unsigned long *flags)
{
- if (memcg && locked)
- move_unlock_mem_cgroup(memcg, &flags);
+ if (memcg && *locked)
+ spin_unlock_irqrestore(&memcg->move_lock, *flags);
rcu_read_unlock();
}
static bool consume_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
{
struct memcg_stock_pcp *stock;
- bool ret = true;
+ bool ret = false;
if (nr_pages > CHARGE_BATCH)
- return false;
+ return ret;
stock = &get_cpu_var(memcg_stock);
- if (memcg == stock->cached && stock->nr_pages >= nr_pages)
+ if (memcg == stock->cached && stock->nr_pages >= nr_pages) {
stock->nr_pages -= nr_pages;
- else /* need to call res_counter_charge */
- ret = false;
+ ret = true;
+ }
put_cpu_var(memcg_stock);
return ret;
}
/*
- * Returns stocks cached in percpu to res_counter and reset cached information.
+ * Returns stocks cached in percpu and reset cached information.
*/
static void drain_stock(struct memcg_stock_pcp *stock)
{
struct mem_cgroup *old = stock->cached;
if (stock->nr_pages) {
- unsigned long bytes = stock->nr_pages * PAGE_SIZE;
-
- res_counter_uncharge(&old->res, bytes);
+ page_counter_uncharge(&old->memory, stock->nr_pages);
if (do_swap_account)
- res_counter_uncharge(&old->memsw, bytes);
+ page_counter_uncharge(&old->memsw, stock->nr_pages);
+ css_put_many(&old->css, stock->nr_pages);
stock->nr_pages = 0;
}
stock->cached = NULL;
}
/*
- * Cache charges(val) which is from res_counter, to local per_cpu area.
+ * Cache charges(val) to local per_cpu area.
* This will be consumed by consume_stock() function, later.
*/
static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
/*
* Drains all per-CPU charge caches for given root_memcg resp. subtree
- * of the hierarchy under it. sync flag says whether we should block
- * until the work is done.
+ * of the hierarchy under it.
*/
-static void drain_all_stock(struct mem_cgroup *root_memcg, bool sync)
+static void drain_all_stock(struct mem_cgroup *root_memcg)
{
int cpu, curcpu;
+ /* If someone's already draining, avoid adding running more workers. */
+ if (!mutex_trylock(&percpu_charge_mutex))
+ return;
/* Notify other cpus that system-wide "drain" is running */
get_online_cpus();
curcpu = get_cpu();
memcg = stock->cached;
if (!memcg || !stock->nr_pages)
continue;
- if (!mem_cgroup_same_or_subtree(root_memcg, memcg))
+ if (!mem_cgroup_is_descendant(memcg, root_memcg))
continue;
if (!test_and_set_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) {
if (cpu == curcpu)
}
}
put_cpu();
-
- if (!sync)
- goto out;
-
- for_each_online_cpu(cpu) {
- struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
- if (test_bit(FLUSHING_CACHED_CHARGE, &stock->flags))
- flush_work(&stock->work);
- }
-out:
put_online_cpus();
-}
-
-/*
- * Tries to drain stocked charges in other cpus. This function is asynchronous
- * and just put a work per cpu for draining localy on each cpu. Caller can
- * expects some charges will be back to res_counter later but cannot wait for
- * it.
- */
-static void drain_all_stock_async(struct mem_cgroup *root_memcg)
-{
- /*
- * If someone calls draining, avoid adding more kworker runs.
- */
- if (!mutex_trylock(&percpu_charge_mutex))
- return;
- drain_all_stock(root_memcg, false);
- mutex_unlock(&percpu_charge_mutex);
-}
-
-/* This is a synchronous drain interface. */
-static void drain_all_stock_sync(struct mem_cgroup *root_memcg)
-{
- /* called when force_empty is called */
- mutex_lock(&percpu_charge_mutex);
- drain_all_stock(root_memcg, true);
mutex_unlock(&percpu_charge_mutex);
}
unsigned int batch = max(CHARGE_BATCH, nr_pages);
int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
struct mem_cgroup *mem_over_limit;
- struct res_counter *fail_res;
+ struct page_counter *counter;
unsigned long nr_reclaimed;
- unsigned long long size;
bool may_swap = true;
bool drained = false;
int ret = 0;
if (consume_stock(memcg, nr_pages))
goto done;
- size = batch * PAGE_SIZE;
if (!do_swap_account ||
- !res_counter_charge(&memcg->memsw, size, &fail_res)) {
- if (!res_counter_charge(&memcg->res, size, &fail_res))
+ !page_counter_try_charge(&memcg->memsw, batch, &counter)) {
+ if (!page_counter_try_charge(&memcg->memory, batch, &counter))
goto done_restock;
if (do_swap_account)
- res_counter_uncharge(&memcg->memsw, size);
- mem_over_limit = mem_cgroup_from_res_counter(fail_res, res);
+ page_counter_uncharge(&memcg->memsw, batch);
+ mem_over_limit = mem_cgroup_from_counter(counter, memory);
} else {
- mem_over_limit = mem_cgroup_from_res_counter(fail_res, memsw);
+ mem_over_limit = mem_cgroup_from_counter(counter, memsw);
may_swap = false;
}
goto retry;
if (!drained) {
- drain_all_stock_async(mem_over_limit);
+ drain_all_stock(mem_over_limit);
drained = true;
goto retry;
}
return -EINTR;
done_restock:
+ css_get_many(&memcg->css, batch);
if (batch > nr_pages)
refill_stock(memcg, batch - nr_pages);
done:
static void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages)
{
- unsigned long bytes = nr_pages * PAGE_SIZE;
-
if (mem_cgroup_is_root(memcg))
return;
- res_counter_uncharge(&memcg->res, bytes);
+ page_counter_uncharge(&memcg->memory, nr_pages);
if (do_swap_account)
- res_counter_uncharge(&memcg->memsw, bytes);
-}
-
-/*
- * Cancel chrages in this cgroup....doesn't propagate to parent cgroup.
- * This is useful when moving usage to parent cgroup.
- */
-static void __mem_cgroup_cancel_local_charge(struct mem_cgroup *memcg,
- unsigned int nr_pages)
-{
- unsigned long bytes = nr_pages * PAGE_SIZE;
-
- if (mem_cgroup_is_root(memcg))
- return;
+ page_counter_uncharge(&memcg->memsw, nr_pages);
- res_counter_uncharge_until(&memcg->res, memcg->res.parent, bytes);
- if (do_swap_account)
- res_counter_uncharge_until(&memcg->memsw,
- memcg->memsw.parent, bytes);
+ css_put_many(&memcg->css, nr_pages);
}
/*
*/
struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
{
- struct mem_cgroup *memcg = NULL;
+ struct mem_cgroup *memcg;
struct page_cgroup *pc;
unsigned short id;
swp_entry_t ent;
VM_BUG_ON_PAGE(!PageLocked(page), page);
pc = lookup_page_cgroup(page);
- if (PageCgroupUsed(pc)) {
- memcg = pc->mem_cgroup;
- if (memcg && !css_tryget_online(&memcg->css))
+ memcg = pc->mem_cgroup;
+
+ if (memcg) {
+ if (!css_tryget_online(&memcg->css))
memcg = NULL;
} else if (PageSwapCache(page)) {
ent.val = page_private(page);
struct page_cgroup *pc = lookup_page_cgroup(page);
int isolated;
- VM_BUG_ON_PAGE(PageCgroupUsed(pc), page);
+ VM_BUG_ON_PAGE(pc->mem_cgroup, page);
/*
* we don't need page_cgroup_lock about tail pages, becase they are not
* accessed by any other context at this point.
/*
* Nobody should be changing or seriously looking at
- * pc->mem_cgroup and pc->flags at this point:
+ * pc->mem_cgroup at this point:
*
* - the page is uncharged
*
* have the page locked
*/
pc->mem_cgroup = memcg;
- pc->flags = PCG_USED | PCG_MEM | (do_swap_account ? PCG_MEMSW : 0);
if (lrucare)
unlock_page_lru(page, isolated);
}
-static DEFINE_MUTEX(set_limit_mutex);
-
#ifdef CONFIG_MEMCG_KMEM
/*
* The memcg_slab_mutex is held whenever a per memcg kmem cache is created or
*/
static DEFINE_MUTEX(memcg_slab_mutex);
-static DEFINE_MUTEX(activate_kmem_mutex);
-
/*
* This is a bit cumbersome, but it is rarely used and avoids a backpointer
* in the memcg_cache_params struct.
return cache_from_memcg_idx(cachep, memcg_cache_id(p->memcg));
}
-#ifdef CONFIG_SLABINFO
-static int mem_cgroup_slabinfo_read(struct seq_file *m, void *v)
+static int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp,
+ unsigned long nr_pages)
{
- struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
- struct memcg_cache_params *params;
-
- if (!memcg_kmem_is_active(memcg))
- return -EIO;
-
- print_slabinfo_header(m);
-
- mutex_lock(&memcg_slab_mutex);
- list_for_each_entry(params, &memcg->memcg_slab_caches, list)
- cache_show(memcg_params_to_cache(params), m);
- mutex_unlock(&memcg_slab_mutex);
-
- return 0;
-}
-#endif
-
-static int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, u64 size)
-{
- struct res_counter *fail_res;
+ struct page_counter *counter;
int ret = 0;
- ret = res_counter_charge(&memcg->kmem, size, &fail_res);
- if (ret)
+ ret = page_counter_try_charge(&memcg->kmem, nr_pages, &counter);
+ if (ret < 0)
return ret;
- ret = try_charge(memcg, gfp, size >> PAGE_SHIFT);
+ ret = try_charge(memcg, gfp, nr_pages);
if (ret == -EINTR) {
/*
* try_charge() chose to bypass to root due to OOM kill or
* when the allocation triggers should have been already
* directed to the root cgroup in memcontrol.h
*/
- res_counter_charge_nofail(&memcg->res, size, &fail_res);
+ page_counter_charge(&memcg->memory, nr_pages);
if (do_swap_account)
- res_counter_charge_nofail(&memcg->memsw, size,
- &fail_res);
+ page_counter_charge(&memcg->memsw, nr_pages);
+ css_get_many(&memcg->css, nr_pages);
ret = 0;
} else if (ret)
- res_counter_uncharge(&memcg->kmem, size);
+ page_counter_uncharge(&memcg->kmem, nr_pages);
return ret;
}
-static void memcg_uncharge_kmem(struct mem_cgroup *memcg, u64 size)
+static void memcg_uncharge_kmem(struct mem_cgroup *memcg,
+ unsigned long nr_pages)
{
- res_counter_uncharge(&memcg->res, size);
+ page_counter_uncharge(&memcg->memory, nr_pages);
if (do_swap_account)
- res_counter_uncharge(&memcg->memsw, size);
+ page_counter_uncharge(&memcg->memsw, nr_pages);
- /* Not down to 0 */
- if (res_counter_uncharge(&memcg->kmem, size))
- return;
+ page_counter_uncharge(&memcg->kmem, nr_pages);
- /*
- * Releases a reference taken in kmem_cgroup_css_offline in case
- * this last uncharge is racing with the offlining code or it is
- * outliving the memcg existence.
- *
- * The memory barrier imposed by test&clear is paired with the
- * explicit one in memcg_kmem_mark_dead().
- */
- if (memcg_kmem_test_and_clear_dead(memcg))
- css_put(&memcg->css);
+ css_put_many(&memcg->css, nr_pages);
}
/*
int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order)
{
+ unsigned int nr_pages = 1 << order;
int res;
- res = memcg_charge_kmem(cachep->memcg_params->memcg, gfp,
- PAGE_SIZE << order);
+ res = memcg_charge_kmem(cachep->memcg_params->memcg, gfp, nr_pages);
if (!res)
- atomic_add(1 << order, &cachep->memcg_params->nr_pages);
+ atomic_add(nr_pages, &cachep->memcg_params->nr_pages);
return res;
}
void __memcg_uncharge_slab(struct kmem_cache *cachep, int order)
{
- memcg_uncharge_kmem(cachep->memcg_params->memcg, PAGE_SIZE << order);
- atomic_sub(1 << order, &cachep->memcg_params->nr_pages);
+ unsigned int nr_pages = 1 << order;
+
+ memcg_uncharge_kmem(cachep->memcg_params->memcg, nr_pages);
+ atomic_sub(nr_pages, &cachep->memcg_params->nr_pages);
}
/*
return true;
}
- ret = memcg_charge_kmem(memcg, gfp, PAGE_SIZE << order);
+ ret = memcg_charge_kmem(memcg, gfp, 1 << order);
if (!ret)
*_memcg = memcg;
/* The page allocation failed. Revert */
if (!page) {
- memcg_uncharge_kmem(memcg, PAGE_SIZE << order);
+ memcg_uncharge_kmem(memcg, 1 << order);
return;
}
- /*
- * The page is freshly allocated and not visible to any
- * outside callers yet. Set up pc non-atomically.
- */
pc = lookup_page_cgroup(page);
pc->mem_cgroup = memcg;
- pc->flags = PCG_USED;
}
void __memcg_kmem_uncharge_pages(struct page *page, int order)
{
- struct mem_cgroup *memcg = NULL;
- struct page_cgroup *pc;
-
-
- pc = lookup_page_cgroup(page);
- if (!PageCgroupUsed(pc))
- return;
-
- memcg = pc->mem_cgroup;
- pc->flags = 0;
+ struct page_cgroup *pc = lookup_page_cgroup(page);
+ struct mem_cgroup *memcg = pc->mem_cgroup;
- /*
- * We trust that only if there is a memcg associated with the page, it
- * is a valid allocation
- */
if (!memcg)
return;
VM_BUG_ON_PAGE(mem_cgroup_is_root(memcg), page);
- memcg_uncharge_kmem(memcg, PAGE_SIZE << order);
+
+ memcg_uncharge_kmem(memcg, 1 << order);
+ pc->mem_cgroup = NULL;
}
#else
static inline void memcg_unregister_all_caches(struct mem_cgroup *memcg)
*/
void mem_cgroup_split_huge_fixup(struct page *head)
{
- struct page_cgroup *head_pc = lookup_page_cgroup(head);
- struct page_cgroup *pc;
- struct mem_cgroup *memcg;
+ struct page_cgroup *pc = lookup_page_cgroup(head);
int i;
if (mem_cgroup_disabled())
return;
- memcg = head_pc->mem_cgroup;
- for (i = 1; i < HPAGE_PMD_NR; i++) {
- pc = head_pc + i;
- pc->mem_cgroup = memcg;
- pc->flags = head_pc->flags;
- }
- __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS_HUGE],
+ for (i = 1; i < HPAGE_PMD_NR; i++)
+ pc[i].mem_cgroup = pc[0].mem_cgroup;
+
+ __this_cpu_sub(pc[0].mem_cgroup->stat->count[MEM_CGROUP_STAT_RSS_HUGE],
HPAGE_PMD_NR);
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
goto out;
ret = -EINVAL;
- if (!PageCgroupUsed(pc) || pc->mem_cgroup != from)
+ if (pc->mem_cgroup != from)
goto out_unlock;
- move_lock_mem_cgroup(from, &flags);
+ spin_lock_irqsave(&from->move_lock, flags);
if (!PageAnon(page) && page_mapped(page)) {
__this_cpu_sub(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED],
/* caller should have done css_get */
pc->mem_cgroup = to;
- move_unlock_mem_cgroup(from, &flags);
+ spin_unlock_irqrestore(&from->move_lock, flags);
+
ret = 0;
local_irq_disable();
return ret;
}
-/**
- * mem_cgroup_move_parent - moves page to the parent group
- * @page: the page to move
- * @pc: page_cgroup of the page
- * @child: page's cgroup
- *
- * move charges to its parent or the root cgroup if the group has no
- * parent (aka use_hierarchy==0).
- * Although this might fail (get_page_unless_zero, isolate_lru_page or
- * mem_cgroup_move_account fails) the failure is always temporary and
- * it signals a race with a page removal/uncharge or migration. In the
- * first case the page is on the way out and it will vanish from the LRU
- * on the next attempt and the call should be retried later.
- * Isolation from the LRU fails only if page has been isolated from
- * the LRU since we looked at it and that usually means either global
- * reclaim or migration going on. The page will either get back to the
- * LRU or vanish.
- * Finaly mem_cgroup_move_account fails only if the page got uncharged
- * (!PageCgroupUsed) or moved to a different group. The page will
- * disappear in the next attempt.
- */
-static int mem_cgroup_move_parent(struct page *page,
- struct page_cgroup *pc,
- struct mem_cgroup *child)
-{
- struct mem_cgroup *parent;
- unsigned int nr_pages;
- unsigned long uninitialized_var(flags);
- int ret;
-
- VM_BUG_ON(mem_cgroup_is_root(child));
-
- ret = -EBUSY;
- if (!get_page_unless_zero(page))
- goto out;
- if (isolate_lru_page(page))
- goto put;
-
- nr_pages = hpage_nr_pages(page);
-
- parent = parent_mem_cgroup(child);
- /*
- * If no parent, move charges to root cgroup.
- */
- if (!parent)
- parent = root_mem_cgroup;
-
- if (nr_pages > 1) {
- VM_BUG_ON_PAGE(!PageTransHuge(page), page);
- flags = compound_lock_irqsave(page);
- }
-
- ret = mem_cgroup_move_account(page, nr_pages,
- pc, child, parent);
- if (!ret)
- __mem_cgroup_cancel_local_charge(child, nr_pages);
-
- if (nr_pages > 1)
- compound_unlock_irqrestore(page, flags);
- putback_lru_page(page);
-put:
- put_page(page);
-out:
- return ret;
-}
-
#ifdef CONFIG_MEMCG_SWAP
static void mem_cgroup_swap_statistics(struct mem_cgroup *memcg,
bool charge)
*
* Returns 0 on success, -EINVAL on failure.
*
- * The caller must have charged to @to, IOW, called res_counter_charge() about
+ * The caller must have charged to @to, IOW, called page_counter_charge() about
* both res and memsw, and called css_get().
*/
static int mem_cgroup_move_swap_account(swp_entry_t entry,
mem_cgroup_swap_statistics(to, true);
/*
* This function is only called from task migration context now.
- * It postpones res_counter and refcount handling till the end
+ * It postpones page_counter and refcount handling till the end
* of task migration(mem_cgroup_clear_mc()) for performance
* improvement. But we cannot postpone css_get(to) because if
* the process that has been moved to @to does swap-in, the
* the first time, i.e. during boot or memory hotplug;
* or when mem_cgroup_disabled().
*/
- if (likely(pc) && PageCgroupUsed(pc))
+ if (likely(pc) && pc->mem_cgroup)
return pc;
return NULL;
}
struct page_cgroup *pc;
pc = lookup_page_cgroup_used(page);
- if (pc) {
- pr_alert("pc:%p pc->flags:%lx pc->mem_cgroup:%p\n",
- pc, pc->flags, pc->mem_cgroup);
- }
+ if (pc)
+ pr_alert("pc:%p pc->mem_cgroup:%p\n", pc, pc->mem_cgroup);
}
#endif
+static DEFINE_MUTEX(memcg_limit_mutex);
+
static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
- unsigned long long val)
+ unsigned long limit)
{
+ unsigned long curusage;
+ unsigned long oldusage;
+ bool enlarge = false;
int retry_count;
- int ret = 0;
- int children = mem_cgroup_count_children(memcg);
- u64 curusage, oldusage;
- int enlarge;
+ int ret;
/*
* 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;
+ retry_count = MEM_CGROUP_RECLAIM_RETRIES *
+ mem_cgroup_count_children(memcg);
- oldusage = res_counter_read_u64(&memcg->res, RES_USAGE);
+ oldusage = page_counter_read(&memcg->memory);
- enlarge = 0;
- while (retry_count) {
+ do {
if (signal_pending(current)) {
ret = -EINTR;
break;
}
- /*
- * Rather than hide all in some function, I do this in
- * open coded manner. You see what this really does.
- * We have to guarantee memcg->res.limit <= memcg->memsw.limit.
- */
- mutex_lock(&set_limit_mutex);
- if (res_counter_read_u64(&memcg->memsw, RES_LIMIT) < val) {
+
+ mutex_lock(&memcg_limit_mutex);
+ if (limit > memcg->memsw.limit) {
+ mutex_unlock(&memcg_limit_mutex);
ret = -EINVAL;
- mutex_unlock(&set_limit_mutex);
break;
}
-
- if (res_counter_read_u64(&memcg->res, RES_LIMIT) < val)
- enlarge = 1;
-
- ret = res_counter_set_limit(&memcg->res, val);
- mutex_unlock(&set_limit_mutex);
+ if (limit > memcg->memory.limit)
+ enlarge = true;
+ ret = page_counter_limit(&memcg->memory, limit);
+ mutex_unlock(&memcg_limit_mutex);
if (!ret)
break;
try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL, true);
- curusage = res_counter_read_u64(&memcg->res, RES_USAGE);
+ curusage = page_counter_read(&memcg->memory);
/* Usage is reduced ? */
if (curusage >= oldusage)
retry_count--;
else
oldusage = curusage;
- }
+ } while (retry_count);
+
if (!ret && enlarge)
memcg_oom_recover(memcg);
}
static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg,
- unsigned long long val)
+ unsigned long limit)
{
+ unsigned long curusage;
+ unsigned long oldusage;
+ bool enlarge = false;
int retry_count;
- u64 oldusage, curusage;
- int children = mem_cgroup_count_children(memcg);
- int ret = -EBUSY;
- int enlarge = 0;
+ int ret;
/* 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) {
+ retry_count = MEM_CGROUP_RECLAIM_RETRIES *
+ mem_cgroup_count_children(memcg);
+
+ oldusage = page_counter_read(&memcg->memsw);
+
+ do {
if (signal_pending(current)) {
ret = -EINTR;
break;
}
- /*
- * Rather than hide all in some function, I do this in
- * open coded manner. You see what this really does.
- * We have to guarantee memcg->res.limit <= memcg->memsw.limit.
- */
- mutex_lock(&set_limit_mutex);
- if (res_counter_read_u64(&memcg->res, RES_LIMIT) > val) {
+
+ mutex_lock(&memcg_limit_mutex);
+ if (limit < memcg->memory.limit) {
+ mutex_unlock(&memcg_limit_mutex);
ret = -EINVAL;
- mutex_unlock(&set_limit_mutex);
break;
}
- if (res_counter_read_u64(&memcg->memsw, RES_LIMIT) < val)
- enlarge = 1;
- ret = res_counter_set_limit(&memcg->memsw, val);
- mutex_unlock(&set_limit_mutex);
+ if (limit > memcg->memsw.limit)
+ enlarge = true;
+ ret = page_counter_limit(&memcg->memsw, limit);
+ mutex_unlock(&memcg_limit_mutex);
if (!ret)
break;
try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL, false);
- curusage = res_counter_read_u64(&memcg->memsw, RES_USAGE);
+ curusage = page_counter_read(&memcg->memsw);
/* Usage is reduced ? */
if (curusage >= oldusage)
retry_count--;
else
oldusage = curusage;
- }
+ } while (retry_count);
+
if (!ret && enlarge)
memcg_oom_recover(memcg);
+
return ret;
}
unsigned long reclaimed;
int loop = 0;
struct mem_cgroup_tree_per_zone *mctz;
- unsigned long long excess;
+ unsigned long excess;
unsigned long nr_scanned;
if (order > 0)
nr_reclaimed += reclaimed;
*total_scanned += nr_scanned;
spin_lock_irq(&mctz->lock);
+ __mem_cgroup_remove_exceeded(mz, mctz);
/*
* 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->memcg->css);
- else /* next_mz == NULL or other memcg */
- break;
- } while (1);
- }
- __mem_cgroup_remove_exceeded(mz, mctz);
- excess = res_counter_soft_limit_excess(&mz->memcg->res);
+ if (!reclaimed)
+ next_mz = __mem_cgroup_largest_soft_limit_node(mctz);
+
+ excess = soft_limit_excess(mz->memcg);
/*
* One school of thought says that we should not add
* back the node to the tree if reclaim returns 0.
return nr_reclaimed;
}
-/**
- * mem_cgroup_force_empty_list - clears LRU of a group
- * @memcg: group to clear
- * @node: NUMA node
- * @zid: zone id
- * @lru: lru to to clear
- *
- * Traverse a specified page_cgroup list and try to drop them all. This doesn't
- * reclaim the pages page themselves - pages are moved to the parent (or root)
- * group.
- */
-static void mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
- int node, int zid, enum lru_list lru)
-{
- struct lruvec *lruvec;
- unsigned long flags;
- struct list_head *list;
- struct page *busy;
- struct zone *zone;
-
- zone = &NODE_DATA(node)->node_zones[zid];
- lruvec = mem_cgroup_zone_lruvec(zone, memcg);
- list = &lruvec->lists[lru];
-
- busy = NULL;
- do {
- struct page_cgroup *pc;
- struct page *page;
-
- spin_lock_irqsave(&zone->lru_lock, flags);
- if (list_empty(list)) {
- spin_unlock_irqrestore(&zone->lru_lock, flags);
- break;
- }
- page = list_entry(list->prev, struct page, lru);
- if (busy == page) {
- list_move(&page->lru, list);
- busy = NULL;
- spin_unlock_irqrestore(&zone->lru_lock, flags);
- continue;
- }
- spin_unlock_irqrestore(&zone->lru_lock, flags);
-
- pc = lookup_page_cgroup(page);
-
- if (mem_cgroup_move_parent(page, pc, memcg)) {
- /* found lock contention or "pc" is obsolete. */
- busy = page;
- } else
- busy = NULL;
- cond_resched();
- } while (!list_empty(list));
-}
-
-/*
- * make mem_cgroup's charge to be 0 if there is no task by moving
- * all the charges and pages to the parent.
- * This enables deleting this mem_cgroup.
- *
- * Caller is responsible for holding css reference on the memcg.
- */
-static void mem_cgroup_reparent_charges(struct mem_cgroup *memcg)
-{
- int node, zid;
- u64 usage;
-
- do {
- /* This is for making all *used* pages to be on LRU. */
- lru_add_drain_all();
- drain_all_stock_sync(memcg);
- mem_cgroup_start_move(memcg);
- for_each_node_state(node, N_MEMORY) {
- for (zid = 0; zid < MAX_NR_ZONES; zid++) {
- enum lru_list lru;
- for_each_lru(lru) {
- mem_cgroup_force_empty_list(memcg,
- node, zid, lru);
- }
- }
- }
- mem_cgroup_end_move(memcg);
- memcg_oom_recover(memcg);
- cond_resched();
-
- /*
- * Kernel memory may not necessarily be trackable to a specific
- * process. So they are not migrated, and therefore we can't
- * expect their value to drop to 0 here.
- * Having res filled up with kmem only is enough.
- *
- * This is a safety check because mem_cgroup_force_empty_list
- * could have raced with mem_cgroup_replace_page_cache callers
- * so the lru seemed empty but the page could have been added
- * right after the check. RES_USAGE should be safe as we always
- * charge before adding to the LRU.
- */
- usage = res_counter_read_u64(&memcg->res, RES_USAGE) -
- res_counter_read_u64(&memcg->kmem, RES_USAGE);
- } while (usage > 0);
-}
-
/*
* Test whether @memcg has children, dead or alive. Note that this
* function doesn't care whether @memcg has use_hierarchy enabled and
/* we call try-to-free pages for make this cgroup empty */
lru_add_drain_all();
/* try to free all pages in this cgroup */
- while (nr_retries && res_counter_read_u64(&memcg->res, RES_USAGE) > 0) {
+ while (nr_retries && page_counter_read(&memcg->memory)) {
int progress;
if (signal_pending(current))
return retval;
}
-static unsigned long mem_cgroup_recursive_stat(struct mem_cgroup *memcg,
- enum mem_cgroup_stat_index idx)
+static unsigned long tree_stat(struct mem_cgroup *memcg,
+ enum mem_cgroup_stat_index idx)
{
struct mem_cgroup *iter;
long val = 0;
{
u64 val;
- if (!mem_cgroup_is_root(memcg)) {
+ if (mem_cgroup_is_root(memcg)) {
+ val = tree_stat(memcg, MEM_CGROUP_STAT_CACHE);
+ val += tree_stat(memcg, MEM_CGROUP_STAT_RSS);
+ if (swap)
+ val += tree_stat(memcg, MEM_CGROUP_STAT_SWAP);
+ } else {
if (!swap)
- return res_counter_read_u64(&memcg->res, RES_USAGE);
+ val = page_counter_read(&memcg->memory);
else
- return res_counter_read_u64(&memcg->memsw, RES_USAGE);
+ val = page_counter_read(&memcg->memsw);
}
-
- /*
- * Transparent hugepages are still accounted for in MEM_CGROUP_STAT_RSS
- * as well as in MEM_CGROUP_STAT_RSS_HUGE.
- */
- val = mem_cgroup_recursive_stat(memcg, MEM_CGROUP_STAT_CACHE);
- val += mem_cgroup_recursive_stat(memcg, MEM_CGROUP_STAT_RSS);
-
- if (swap)
- val += mem_cgroup_recursive_stat(memcg, MEM_CGROUP_STAT_SWAP);
-
return val << PAGE_SHIFT;
}
+enum {
+ RES_USAGE,
+ RES_LIMIT,
+ RES_MAX_USAGE,
+ RES_FAILCNT,
+ RES_SOFT_LIMIT,
+};
static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css,
struct cftype *cft)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
- enum res_type type = MEMFILE_TYPE(cft->private);
- int name = MEMFILE_ATTR(cft->private);
+ struct page_counter *counter;
- switch (type) {
+ switch (MEMFILE_TYPE(cft->private)) {
case _MEM:
- if (name == RES_USAGE)
- return mem_cgroup_usage(memcg, false);
- return res_counter_read_u64(&memcg->res, name);
+ counter = &memcg->memory;
+ break;
case _MEMSWAP:
- if (name == RES_USAGE)
- return mem_cgroup_usage(memcg, true);
- return res_counter_read_u64(&memcg->memsw, name);
+ counter = &memcg->memsw;
+ break;
case _KMEM:
- return res_counter_read_u64(&memcg->kmem, name);
+ counter = &memcg->kmem;
break;
default:
BUG();
}
+
+ switch (MEMFILE_ATTR(cft->private)) {
+ case RES_USAGE:
+ if (counter == &memcg->memory)
+ return mem_cgroup_usage(memcg, false);
+ if (counter == &memcg->memsw)
+ return mem_cgroup_usage(memcg, true);
+ return (u64)page_counter_read(counter) * PAGE_SIZE;
+ case RES_LIMIT:
+ return (u64)counter->limit * PAGE_SIZE;
+ case RES_MAX_USAGE:
+ return (u64)counter->watermark * PAGE_SIZE;
+ case RES_FAILCNT:
+ return counter->failcnt;
+ case RES_SOFT_LIMIT:
+ return (u64)memcg->soft_limit * PAGE_SIZE;
+ default:
+ BUG();
+ }
}
#ifdef CONFIG_MEMCG_KMEM
-/* should be called with activate_kmem_mutex held */
-static int __memcg_activate_kmem(struct mem_cgroup *memcg,
- unsigned long long limit)
+static int memcg_activate_kmem(struct mem_cgroup *memcg,
+ unsigned long nr_pages)
{
int err = 0;
int memcg_id;
* We couldn't have accounted to this cgroup, because it hasn't got the
* active bit set yet, so this should succeed.
*/
- err = res_counter_set_limit(&memcg->kmem, limit);
+ err = page_counter_limit(&memcg->kmem, nr_pages);
VM_BUG_ON(err);
static_key_slow_inc(&memcg_kmem_enabled_key);
return err;
}
-static int memcg_activate_kmem(struct mem_cgroup *memcg,
- unsigned long long limit)
-{
- int ret;
-
- mutex_lock(&activate_kmem_mutex);
- ret = __memcg_activate_kmem(memcg, limit);
- mutex_unlock(&activate_kmem_mutex);
- return ret;
-}
-
static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
- unsigned long long val)
+ unsigned long limit)
{
int ret;
+ mutex_lock(&memcg_limit_mutex);
if (!memcg_kmem_is_active(memcg))
- ret = memcg_activate_kmem(memcg, val);
+ ret = memcg_activate_kmem(memcg, limit);
else
- ret = res_counter_set_limit(&memcg->kmem, val);
+ ret = page_counter_limit(&memcg->kmem, limit);
+ mutex_unlock(&memcg_limit_mutex);
return ret;
}
if (!parent)
return 0;
- mutex_lock(&activate_kmem_mutex);
+ mutex_lock(&memcg_limit_mutex);
/*
* If the parent cgroup is not kmem-active now, it cannot be activated
* after this point, because it has at least one child already.
*/
if (memcg_kmem_is_active(parent))
- ret = __memcg_activate_kmem(memcg, RES_COUNTER_MAX);
- mutex_unlock(&activate_kmem_mutex);
+ ret = memcg_activate_kmem(memcg, PAGE_COUNTER_MAX);
+ mutex_unlock(&memcg_limit_mutex);
return ret;
}
#else
static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
- unsigned long long val)
+ unsigned long limit)
{
return -EINVAL;
}
char *buf, size_t nbytes, loff_t off)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
- enum res_type type;
- int name;
- unsigned long long val;
+ unsigned long nr_pages;
int ret;
buf = strstrip(buf);
- type = MEMFILE_TYPE(of_cft(of)->private);
- name = MEMFILE_ATTR(of_cft(of)->private);
+ ret = page_counter_memparse(buf, &nr_pages);
+ if (ret)
+ return ret;
- switch (name) {
+ switch (MEMFILE_ATTR(of_cft(of)->private)) {
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(buf, &val);
- if (ret)
+ switch (MEMFILE_TYPE(of_cft(of)->private)) {
+ case _MEM:
+ ret = mem_cgroup_resize_limit(memcg, nr_pages);
break;
- if (type == _MEM)
- ret = mem_cgroup_resize_limit(memcg, val);
- else if (type == _MEMSWAP)
- ret = mem_cgroup_resize_memsw_limit(memcg, val);
- else if (type == _KMEM)
- ret = memcg_update_kmem_limit(memcg, val);
- else
- return -EINVAL;
- break;
- case RES_SOFT_LIMIT:
- ret = res_counter_memparse_write_strategy(buf, &val);
- if (ret)
+ case _MEMSWAP:
+ ret = mem_cgroup_resize_memsw_limit(memcg, nr_pages);
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;
+ case _KMEM:
+ ret = memcg_update_kmem_limit(memcg, nr_pages);
+ break;
+ }
break;
- default:
- ret = -EINVAL; /* should be BUG() ? */
+ case RES_SOFT_LIMIT:
+ memcg->soft_limit = nr_pages;
+ ret = 0;
break;
}
return ret ?: nbytes;
}
-static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
- unsigned long long *mem_limit, unsigned long long *memsw_limit)
-{
- 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);
- if (!memcg->use_hierarchy)
- goto out;
-
- while (memcg->css.parent) {
- memcg = mem_cgroup_from_css(memcg->css.parent);
- 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;
-}
-
static ssize_t mem_cgroup_reset(struct kernfs_open_file *of, char *buf,
size_t nbytes, loff_t off)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
- int name;
- enum res_type type;
+ struct page_counter *counter;
- type = MEMFILE_TYPE(of_cft(of)->private);
- name = MEMFILE_ATTR(of_cft(of)->private);
+ switch (MEMFILE_TYPE(of_cft(of)->private)) {
+ case _MEM:
+ counter = &memcg->memory;
+ break;
+ case _MEMSWAP:
+ counter = &memcg->memsw;
+ break;
+ case _KMEM:
+ counter = &memcg->kmem;
+ break;
+ default:
+ BUG();
+ }
- switch (name) {
+ switch (MEMFILE_ATTR(of_cft(of)->private)) {
case RES_MAX_USAGE:
- if (type == _MEM)
- res_counter_reset_max(&memcg->res);
- else if (type == _MEMSWAP)
- res_counter_reset_max(&memcg->memsw);
- else if (type == _KMEM)
- res_counter_reset_max(&memcg->kmem);
- else
- return -EINVAL;
+ page_counter_reset_watermark(counter);
break;
case RES_FAILCNT:
- if (type == _MEM)
- res_counter_reset_failcnt(&memcg->res);
- else if (type == _MEMSWAP)
- res_counter_reset_failcnt(&memcg->memsw);
- else if (type == _KMEM)
- res_counter_reset_failcnt(&memcg->kmem);
- else
- return -EINVAL;
+ counter->failcnt = 0;
break;
+ default:
+ BUG();
}
return nbytes;
static int memcg_stat_show(struct seq_file *m, void *v)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+ unsigned long memory, memsw;
struct mem_cgroup *mi;
unsigned int i;
mem_cgroup_nr_lru_pages(memcg, BIT(i)) * PAGE_SIZE);
/* Hierarchical information */
- {
- unsigned long long limit, memsw_limit;
- memcg_get_hierarchical_limit(memcg, &limit, &memsw_limit);
- seq_printf(m, "hierarchical_memory_limit %llu\n", limit);
- if (do_swap_account)
- seq_printf(m, "hierarchical_memsw_limit %llu\n",
- memsw_limit);
+ memory = memsw = PAGE_COUNTER_MAX;
+ for (mi = memcg; mi; mi = parent_mem_cgroup(mi)) {
+ memory = min(memory, mi->memory.limit);
+ memsw = min(memsw, mi->memsw.limit);
}
+ seq_printf(m, "hierarchical_memory_limit %llu\n",
+ (u64)memory * PAGE_SIZE);
+ if (do_swap_account)
+ seq_printf(m, "hierarchical_memsw_limit %llu\n",
+ (u64)memsw * PAGE_SIZE);
for (i = 0; i < MEM_CGROUP_STAT_NSTATS; i++) {
long long val = 0;
static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap)
{
struct mem_cgroup_threshold_ary *t;
- u64 usage;
+ unsigned long usage;
int i;
rcu_read_lock();
{
struct mem_cgroup_thresholds *thresholds;
struct mem_cgroup_threshold_ary *new;
- u64 threshold, usage;
+ unsigned long threshold;
+ unsigned long usage;
int i, size, ret;
- ret = res_counter_memparse_write_strategy(args, &threshold);
+ ret = page_counter_memparse(args, &threshold);
if (ret)
return ret;
{
struct mem_cgroup_thresholds *thresholds;
struct mem_cgroup_threshold_ary *new;
- u64 usage;
+ unsigned long usage;
int i, j, size;
mutex_lock(&memcg->thresholds_lock);
{
mem_cgroup_sockets_destroy(memcg);
}
-
-static void kmem_cgroup_css_offline(struct mem_cgroup *memcg)
-{
- if (!memcg_kmem_is_active(memcg))
- return;
-
- /*
- * kmem charges can outlive the cgroup. In the case of slab
- * pages, for instance, a page contain objects from various
- * processes. As we prevent from taking a reference for every
- * such allocation we have to be careful when doing uncharge
- * (see memcg_uncharge_kmem) and here during offlining.
- *
- * The idea is that that only the _last_ uncharge which sees
- * the dead memcg will drop the last reference. An additional
- * reference is taken here before the group is marked dead
- * which is then paired with css_put during uncharge resp. here.
- *
- * Although this might sound strange as this path is called from
- * css_offline() when the referencemight have dropped down to 0 and
- * shouldn't be incremented anymore (css_tryget_online() would
- * fail) we do not have other options because of the kmem
- * allocations lifetime.
- */
- css_get(&memcg->css);
-
- memcg_kmem_mark_dead(memcg);
-
- if (res_counter_read_u64(&memcg->kmem, RES_USAGE) != 0)
- return;
-
- if (memcg_kmem_test_and_clear_dead(memcg))
- css_put(&memcg->css);
-}
#else
static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
{
static void memcg_destroy_kmem(struct mem_cgroup *memcg)
{
}
-
-static void kmem_cgroup_css_offline(struct mem_cgroup *memcg)
-{
-}
#endif
/*
#ifdef CONFIG_SLABINFO
{
.name = "kmem.slabinfo",
- .seq_show = mem_cgroup_slabinfo_read,
+ .seq_start = slab_start,
+ .seq_next = slab_next,
+ .seq_stop = slab_stop,
+ .seq_show = memcg_slab_show,
},
#endif
#endif
*/
struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
{
- if (!memcg->res.parent)
+ if (!memcg->memory.parent)
return NULL;
- return mem_cgroup_from_res_counter(memcg->res.parent, res);
+ return mem_cgroup_from_counter(memcg->memory.parent, memory);
}
EXPORT_SYMBOL(parent_mem_cgroup);
/* root ? */
if (parent_css == NULL) {
root_mem_cgroup = memcg;
- res_counter_init(&memcg->res, NULL);
- res_counter_init(&memcg->memsw, NULL);
- res_counter_init(&memcg->kmem, NULL);
+ page_counter_init(&memcg->memory, NULL);
+ page_counter_init(&memcg->memsw, NULL);
+ page_counter_init(&memcg->kmem, NULL);
}
memcg->last_scanned_node = MAX_NUMNODES;
memcg->swappiness = mem_cgroup_swappiness(parent);
if (parent->use_hierarchy) {
- res_counter_init(&memcg->res, &parent->res);
- res_counter_init(&memcg->memsw, &parent->memsw);
- res_counter_init(&memcg->kmem, &parent->kmem);
+ page_counter_init(&memcg->memory, &parent->memory);
+ page_counter_init(&memcg->memsw, &parent->memsw);
+ page_counter_init(&memcg->kmem, &parent->kmem);
/*
* No need to take a reference to the parent because cgroup
* core guarantees its existence.
*/
} else {
- res_counter_init(&memcg->res, NULL);
- res_counter_init(&memcg->memsw, NULL);
- res_counter_init(&memcg->kmem, NULL);
+ page_counter_init(&memcg->memory, NULL);
+ page_counter_init(&memcg->memsw, NULL);
+ page_counter_init(&memcg->kmem, NULL);
/*
* Deeper hierachy with use_hierarchy == false doesn't make
* much sense so let cgroup subsystem know about this
return 0;
}
-/*
- * Announce all parents that a group from their hierarchy is gone.
- */
-static void mem_cgroup_invalidate_reclaim_iterators(struct mem_cgroup *memcg)
-{
- struct mem_cgroup *parent = memcg;
-
- while ((parent = parent_mem_cgroup(parent)))
- mem_cgroup_iter_invalidate(parent);
-
- /*
- * if the root memcg is not hierarchical we have to check it
- * explicitely.
- */
- if (!root_mem_cgroup->use_hierarchy)
- mem_cgroup_iter_invalidate(root_mem_cgroup);
-}
-
static void mem_cgroup_css_offline(struct cgroup_subsys_state *css)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup_event *event, *tmp;
- struct cgroup_subsys_state *iter;
/*
* Unregister events and notify userspace.
}
spin_unlock(&memcg->event_list_lock);
- kmem_cgroup_css_offline(memcg);
-
- mem_cgroup_invalidate_reclaim_iterators(memcg);
-
- /*
- * This requires that offlining is serialized. Right now that is
- * guaranteed because css_killed_work_fn() holds the cgroup_mutex.
- */
- css_for_each_descendant_post(iter, css)
- mem_cgroup_reparent_charges(mem_cgroup_from_css(iter));
-
memcg_unregister_all_caches(memcg);
vmpressure_cleanup(&memcg->vmpressure);
}
static void mem_cgroup_css_free(struct cgroup_subsys_state *css)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
- /*
- * XXX: css_offline() would be where we should reparent all
- * memory to prepare the cgroup for destruction. However,
- * memcg does not do css_tryget_online() and res_counter charging
- * under the same RCU lock region, which means that charging
- * could race with offlining. Offlining only happens to
- * cgroups with no tasks in them but charges can show up
- * without any tasks from the swapin path when the target
- * memcg is looked up from the swapout record and not from the
- * current task as it usually is. A race like this can leak
- * charges and put pages with stale cgroup pointers into
- * circulation:
- *
- * #0 #1
- * lookup_swap_cgroup_id()
- * rcu_read_lock()
- * mem_cgroup_lookup()
- * css_tryget_online()
- * rcu_read_unlock()
- * disable css_tryget_online()
- * call_rcu()
- * offline_css()
- * reparent_charges()
- * res_counter_charge()
- * css_put()
- * css_free()
- * pc->mem_cgroup = dead memcg
- * add page to lru
- *
- * The bulk of the charges are still moved in offline_css() to
- * avoid pinning a lot of pages in case a long-term reference
- * like a swapout record is deferring the css_free() to long
- * after offlining. But this makes sure we catch any charges
- * made after offlining:
- */
- mem_cgroup_reparent_charges(memcg);
memcg_destroy_kmem(memcg);
__mem_cgroup_free(memcg);
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
- mem_cgroup_resize_limit(memcg, ULLONG_MAX);
- mem_cgroup_resize_memsw_limit(memcg, ULLONG_MAX);
- memcg_update_kmem_limit(memcg, ULLONG_MAX);
- res_counter_set_soft_limit(&memcg->res, ULLONG_MAX);
+ mem_cgroup_resize_limit(memcg, PAGE_COUNTER_MAX);
+ mem_cgroup_resize_memsw_limit(memcg, PAGE_COUNTER_MAX);
+ memcg_update_kmem_limit(memcg, PAGE_COUNTER_MAX);
+ memcg->soft_limit = 0;
}
#ifdef CONFIG_MMU
* mem_cgroup_move_account() checks the pc is valid or
* not under LRU exclusion.
*/
- if (PageCgroupUsed(pc) && pc->mem_cgroup == mc.from) {
+ if (pc->mem_cgroup == mc.from) {
ret = MC_TARGET_PAGE;
if (target)
target->page = page;
if (!move_anon())
return ret;
pc = lookup_page_cgroup(page);
- if (PageCgroupUsed(pc) && pc->mem_cgroup == mc.from) {
+ if (pc->mem_cgroup == mc.from) {
ret = MC_TARGET_PAGE;
if (target) {
get_page(page);
{
struct mem_cgroup *from = mc.from;
struct mem_cgroup *to = mc.to;
- int i;
/* we must uncharge all the leftover precharges from mc.to */
if (mc.precharge) {
if (mc.moved_swap) {
/* uncharge swap account from the old cgroup */
if (!mem_cgroup_is_root(mc.from))
- res_counter_uncharge(&mc.from->memsw,
- PAGE_SIZE * mc.moved_swap);
-
- for (i = 0; i < mc.moved_swap; i++)
- css_put(&mc.from->css);
+ page_counter_uncharge(&mc.from->memsw, mc.moved_swap);
/*
- * we charged both to->res and to->memsw, so we should
- * uncharge to->res.
+ * we charged both to->memory and to->memsw, so we
+ * should uncharge to->memory.
*/
if (!mem_cgroup_is_root(mc.to))
- res_counter_uncharge(&mc.to->res,
- PAGE_SIZE * mc.moved_swap);
+ page_counter_uncharge(&mc.to->memory, mc.moved_swap);
+
+ css_put_many(&mc.from->css, mc.moved_swap);
+
/* we've already done css_get(mc.to) */
mc.moved_swap = 0;
}
static void mem_cgroup_clear_mc(void)
{
- struct mem_cgroup *from = mc.from;
-
/*
* we must clear moving_task before waking up waiters at the end of
* task migration.
mc.from = NULL;
mc.to = NULL;
spin_unlock(&mc.lock);
- mem_cgroup_end_move(from);
}
static int mem_cgroup_can_attach(struct cgroup_subsys_state *css,
VM_BUG_ON(mc.precharge);
VM_BUG_ON(mc.moved_charge);
VM_BUG_ON(mc.moved_swap);
- mem_cgroup_start_move(from);
+
spin_lock(&mc.lock);
mc.from = from;
mc.to = memcg;
static void mem_cgroup_cancel_attach(struct cgroup_subsys_state *css,
struct cgroup_taskset *tset)
{
- mem_cgroup_clear_mc();
+ if (mc.to)
+ mem_cgroup_clear_mc();
}
static int mem_cgroup_move_charge_pte_range(pmd_t *pmd,
struct vm_area_struct *vma;
lru_add_drain_all();
+ /*
+ * Signal mem_cgroup_begin_page_stat() to take the memcg's
+ * move_lock while we're moving its pages to another memcg.
+ * Then wait for already started RCU-only updates to finish.
+ */
+ atomic_inc(&mc.from->moving_account);
+ synchronize_rcu();
retry:
if (unlikely(!down_read_trylock(&mm->mmap_sem))) {
/*
break;
}
up_read(&mm->mmap_sem);
+ atomic_dec(&mc.from->moving_account);
}
static void mem_cgroup_move_task(struct cgroup_subsys_state *css,
*/
void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
{
+ struct mem_cgroup *memcg;
struct page_cgroup *pc;
unsigned short oldid;
return;
pc = lookup_page_cgroup(page);
+ memcg = pc->mem_cgroup;
/* Readahead page, never charged */
- if (!PageCgroupUsed(pc))
+ if (!memcg)
return;
- VM_BUG_ON_PAGE(!(pc->flags & PCG_MEMSW), page);
-
- oldid = swap_cgroup_record(entry, mem_cgroup_id(pc->mem_cgroup));
+ oldid = swap_cgroup_record(entry, mem_cgroup_id(memcg));
VM_BUG_ON_PAGE(oldid, page);
+ mem_cgroup_swap_statistics(memcg, true);
+
+ pc->mem_cgroup = NULL;
+
+ if (!mem_cgroup_is_root(memcg))
+ page_counter_uncharge(&memcg->memory, 1);
- pc->flags &= ~PCG_MEMSW;
- css_get(&pc->mem_cgroup->css);
- mem_cgroup_swap_statistics(pc->mem_cgroup, true);
+ /* XXX: caller holds IRQ-safe mapping->tree_lock */
+ VM_BUG_ON(!irqs_disabled());
+
+ mem_cgroup_charge_statistics(memcg, page, -1);
+ memcg_check_events(memcg, page);
}
/**
memcg = mem_cgroup_lookup(id);
if (memcg) {
if (!mem_cgroup_is_root(memcg))
- res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
+ page_counter_uncharge(&memcg->memsw, 1);
mem_cgroup_swap_statistics(memcg, false);
css_put(&memcg->css);
}
* the page lock, which serializes swap cache removal, which
* in turn serializes uncharging.
*/
- if (PageCgroupUsed(pc))
+ if (pc->mem_cgroup)
goto out;
}
}
static void uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout,
- unsigned long nr_mem, unsigned long nr_memsw,
unsigned long nr_anon, unsigned long nr_file,
unsigned long nr_huge, struct page *dummy_page)
{
+ unsigned long nr_pages = nr_anon + nr_file;
unsigned long flags;
if (!mem_cgroup_is_root(memcg)) {
- if (nr_mem)
- res_counter_uncharge(&memcg->res,
- nr_mem * PAGE_SIZE);
- if (nr_memsw)
- res_counter_uncharge(&memcg->memsw,
- nr_memsw * PAGE_SIZE);
+ page_counter_uncharge(&memcg->memory, nr_pages);
+ if (do_swap_account)
+ page_counter_uncharge(&memcg->memsw, nr_pages);
memcg_oom_recover(memcg);
}
__this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_CACHE], nr_file);
__this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS_HUGE], nr_huge);
__this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGOUT], pgpgout);
- __this_cpu_add(memcg->stat->nr_page_events, nr_anon + nr_file);
+ __this_cpu_add(memcg->stat->nr_page_events, nr_pages);
memcg_check_events(memcg, dummy_page);
local_irq_restore(flags);
+
+ if (!mem_cgroup_is_root(memcg))
+ css_put_many(&memcg->css, nr_pages);
}
static void uncharge_list(struct list_head *page_list)
{
struct mem_cgroup *memcg = NULL;
- unsigned long nr_memsw = 0;
unsigned long nr_anon = 0;
unsigned long nr_file = 0;
unsigned long nr_huge = 0;
unsigned long pgpgout = 0;
- unsigned long nr_mem = 0;
struct list_head *next;
struct page *page;
VM_BUG_ON_PAGE(page_count(page), page);
pc = lookup_page_cgroup(page);
- if (!PageCgroupUsed(pc))
+ if (!pc->mem_cgroup)
continue;
/*
* Nobody should be changing or seriously looking at
- * pc->mem_cgroup and pc->flags at this point, we have
- * fully exclusive access to the page.
+ * pc->mem_cgroup at this point, we have fully
+ * exclusive access to the page.
*/
if (memcg != pc->mem_cgroup) {
if (memcg) {
- uncharge_batch(memcg, pgpgout, nr_mem, nr_memsw,
- nr_anon, nr_file, nr_huge, page);
- pgpgout = nr_mem = nr_memsw = 0;
- nr_anon = nr_file = nr_huge = 0;
+ uncharge_batch(memcg, pgpgout, nr_anon, nr_file,
+ nr_huge, page);
+ pgpgout = nr_anon = nr_file = nr_huge = 0;
}
memcg = pc->mem_cgroup;
}
else
nr_file += nr_pages;
- if (pc->flags & PCG_MEM)
- nr_mem += nr_pages;
- if (pc->flags & PCG_MEMSW)
- nr_memsw += nr_pages;
- pc->flags = 0;
+ pc->mem_cgroup = NULL;
pgpgout++;
} while (next != page_list);
if (memcg)
- uncharge_batch(memcg, pgpgout, nr_mem, nr_memsw,
- nr_anon, nr_file, nr_huge, page);
+ uncharge_batch(memcg, pgpgout, nr_anon, nr_file,
+ nr_huge, page);
}
/**
/* Don't touch page->lru of any random page, pre-check: */
pc = lookup_page_cgroup(page);
- if (!PageCgroupUsed(pc))
+ if (!pc->mem_cgroup)
return;
INIT_LIST_HEAD(&page->lru);
void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
bool lrucare)
{
+ struct mem_cgroup *memcg;
struct page_cgroup *pc;
int isolated;
/* Page cache replacement: new page already charged? */
pc = lookup_page_cgroup(newpage);
- if (PageCgroupUsed(pc))
+ if (pc->mem_cgroup)
return;
- /* Re-entrant migration: old page already uncharged? */
+ /*
+ * Swapcache readahead pages can get migrated before being
+ * charged, and migration from compaction can happen to an
+ * uncharged page when the PFN walker finds a page that
+ * reclaim just put back on the LRU but has not released yet.
+ */
pc = lookup_page_cgroup(oldpage);
- if (!PageCgroupUsed(pc))
+ memcg = pc->mem_cgroup;
+ if (!memcg)
return;
- VM_BUG_ON_PAGE(!(pc->flags & PCG_MEM), oldpage);
- VM_BUG_ON_PAGE(do_swap_account && !(pc->flags & PCG_MEMSW), oldpage);
-
if (lrucare)
lock_page_lru(oldpage, &isolated);
- pc->flags = 0;
+ pc->mem_cgroup = NULL;
if (lrucare)
unlock_page_lru(oldpage, isolated);
- commit_charge(newpage, pc->mem_cgroup, lrucare);
+ commit_charge(newpage, memcg, lrucare);
}
/*
git.openpandora.org / pandora-kernel.git / blobdiff