return !cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_noswap;
}
-/* memcg and lruvec stats flushing */
-static void flush_memcg_stats_dwork(struct work_struct *w);
-static DECLARE_DEFERRABLE_WORK(stats_flush_dwork, flush_memcg_stats_dwork);
-static DEFINE_SPINLOCK(stats_flush_lock);
-
#define THRESHOLDS_EVENTS_TARGET 128
#define SOFTLIMIT_EVENTS_TARGET 1024
iter != NULL; \
iter = mem_cgroup_iter(NULL, iter, NULL))
-static inline bool should_force_charge(void)
+static inline bool task_is_dying(void)
{
return tsk_is_oom_victim(current) || fatal_signal_pending(current) ||
(current->flags & PF_EXITING);
}
#ifdef CONFIG_MEMCG_KMEM
-extern spinlock_t css_set_lock;
+static DEFINE_SPINLOCK(objcg_lock);
bool mem_cgroup_kmem_disabled(void)
{
if (nr_pages)
obj_cgroup_uncharge_pages(objcg, nr_pages);
- spin_lock_irqsave(&css_set_lock, flags);
+ spin_lock_irqsave(&objcg_lock, flags);
list_del(&objcg->list);
- spin_unlock_irqrestore(&css_set_lock, flags);
+ spin_unlock_irqrestore(&objcg_lock, flags);
percpu_ref_exit(ref);
kfree_rcu(objcg, rcu);
objcg = rcu_replace_pointer(memcg->objcg, NULL, true);
- spin_lock_irq(&css_set_lock);
+ spin_lock_irq(&objcg_lock);
/* 1) Ready to reparent active objcg. */
list_add(&objcg->list, &memcg->objcg_list);
/* 3) Move already reparented objcgs to the parent's list */
list_splice(&memcg->objcg_list, &parent->objcg_list);
- spin_unlock_irq(&css_set_lock);
+ spin_unlock_irq(&objcg_lock);
percpu_ref_kill(&objcg->refcnt);
}
return mz;
}
+/*
+ * memcg and lruvec stats flushing
+ *
+ * Many codepaths leading to stats update or read are performance sensitive and
+ * adding stats flushing in such codepaths is not desirable. So, to optimize the
+ * flushing the kernel does:
+ *
+ * 1) Periodically and asynchronously flush the stats every 2 seconds to not let
+ * rstat update tree grow unbounded.
+ *
+ * 2) Flush the stats synchronously on reader side only when there are more than
+ * (MEMCG_CHARGE_BATCH * nr_cpus) update events. Though this optimization
+ * will let stats be out of sync by atmost (MEMCG_CHARGE_BATCH * nr_cpus) but
+ * only for 2 seconds due to (1).
+ */
+static void flush_memcg_stats_dwork(struct work_struct *w);
+static DECLARE_DEFERRABLE_WORK(stats_flush_dwork, flush_memcg_stats_dwork);
+static DEFINE_SPINLOCK(stats_flush_lock);
+static DEFINE_PER_CPU(unsigned int, stats_updates);
+static atomic_t stats_flush_threshold = ATOMIC_INIT(0);
+static u64 flush_next_time;
+
+#define FLUSH_TIME (2UL*HZ)
+
+/*
+ * Accessors to ensure that preemption is disabled on PREEMPT_RT because it can
+ * not rely on this as part of an acquired spinlock_t lock. These functions are
+ * never used in hardirq context on PREEMPT_RT and therefore disabling preemtion
+ * is sufficient.
+ */
+static void memcg_stats_lock(void)
+{
+#ifdef CONFIG_PREEMPT_RT
+ preempt_disable();
+#else
+ VM_BUG_ON(!irqs_disabled());
+#endif
+}
+
+static void __memcg_stats_lock(void)
+{
+#ifdef CONFIG_PREEMPT_RT
+ preempt_disable();
+#endif
+}
+
+static void memcg_stats_unlock(void)
+{
+#ifdef CONFIG_PREEMPT_RT
+ preempt_enable();
+#endif
+}
+
+static inline void memcg_rstat_updated(struct mem_cgroup *memcg, int val)
+{
+ unsigned int x;
+
+ cgroup_rstat_updated(memcg->css.cgroup, smp_processor_id());
+
+ x = __this_cpu_add_return(stats_updates, abs(val));
+ if (x > MEMCG_CHARGE_BATCH) {
+ atomic_add(x / MEMCG_CHARGE_BATCH, &stats_flush_threshold);
+ __this_cpu_write(stats_updates, 0);
+ }
+}
+
+static void __mem_cgroup_flush_stats(void)
+{
+ unsigned long flag;
+
+ if (!spin_trylock_irqsave(&stats_flush_lock, flag))
+ return;
+
+ flush_next_time = jiffies_64 + 2*FLUSH_TIME;
+ cgroup_rstat_flush_irqsafe(root_mem_cgroup->css.cgroup);
+ atomic_set(&stats_flush_threshold, 0);
+ spin_unlock_irqrestore(&stats_flush_lock, flag);
+}
+
+void mem_cgroup_flush_stats(void)
+{
+ if (atomic_read(&stats_flush_threshold) > num_online_cpus())
+ __mem_cgroup_flush_stats();
+}
+
+void mem_cgroup_flush_stats_delayed(void)
+{
+ if (time_after64(jiffies_64, flush_next_time))
+ mem_cgroup_flush_stats();
+}
+
+static void flush_memcg_stats_dwork(struct work_struct *w)
+{
+ __mem_cgroup_flush_stats();
+ queue_delayed_work(system_unbound_wq, &stats_flush_dwork, FLUSH_TIME);
+}
+
/**
* __mod_memcg_state - update cgroup memory statistics
* @memcg: the memory cgroup
return;
__this_cpu_add(memcg->vmstats_percpu->state[idx], val);
- cgroup_rstat_updated(memcg->css.cgroup, smp_processor_id());
+ memcg_rstat_updated(memcg, val);
}
/* idx can be of type enum memcg_stat_item or node_stat_item. */
pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
memcg = pn->memcg;
+ /*
+ * The caller from rmap relay on disabled preemption becase they never
+ * update their counter from in-interrupt context. For these two
+ * counters we check that the update is never performed from an
+ * interrupt context while other caller need to have disabled interrupt.
+ */
+ __memcg_stats_lock();
+ if (IS_ENABLED(CONFIG_DEBUG_VM) && !IS_ENABLED(CONFIG_PREEMPT_RT)) {
+ switch (idx) {
+ case NR_ANON_MAPPED:
+ case NR_FILE_MAPPED:
+ case NR_ANON_THPS:
+ case NR_SHMEM_PMDMAPPED:
+ case NR_FILE_PMDMAPPED:
+ WARN_ON_ONCE(!in_task());
+ break;
+ default:
+ WARN_ON_ONCE(!irqs_disabled());
+ }
+ }
+
/* Update memcg */
- __mod_memcg_state(memcg, idx, val);
+ __this_cpu_add(memcg->vmstats_percpu->state[idx], val);
/* Update lruvec */
__this_cpu_add(pn->lruvec_stats_percpu->state[idx], val);
+
+ memcg_rstat_updated(memcg, val);
+ memcg_stats_unlock();
}
/**
if (mem_cgroup_disabled())
return;
+ memcg_stats_lock();
__this_cpu_add(memcg->vmstats_percpu->events[idx], count);
- cgroup_rstat_updated(memcg->css.cgroup, smp_processor_id());
+ memcg_rstat_updated(memcg, count);
+ memcg_stats_unlock();
}
static unsigned long memcg_events(struct mem_cgroup *memcg, int event)
*/
static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
{
+ if (IS_ENABLED(CONFIG_PREEMPT_RT))
+ return;
+
/* threshold event is triggered in finer grain than soft limit */
if (unlikely(mem_cgroup_event_ratelimit(memcg,
MEM_CGROUP_TARGET_THRESH))) {
*
* Current memory state:
*/
- cgroup_rstat_flush(memcg->css.cgroup);
+ mem_cgroup_flush_stats();
for (i = 0; i < ARRAY_SIZE(memory_stats); i++) {
u64 size;
* A few threads which were not waiting at mutex_lock_killable() can
* fail to bail out. Therefore, check again after holding oom_lock.
*/
- ret = should_force_charge() || out_of_memory(&oc);
+ ret = task_is_dying() || out_of_memory(&oc);
unlock:
mutex_unlock(&oom_lock);
}
EXPORT_SYMBOL(unlock_page_memcg);
-struct obj_stock {
+struct memcg_stock_pcp {
+ local_lock_t stock_lock;
+ struct mem_cgroup *cached; /* this never be root cgroup */
+ unsigned int nr_pages;
+
#ifdef CONFIG_MEMCG_KMEM
struct obj_cgroup *cached_objcg;
struct pglist_data *cached_pgdat;
unsigned int nr_bytes;
int nr_slab_reclaimable_b;
int nr_slab_unreclaimable_b;
-#else
- int dummy[0];
#endif
-};
-
-struct memcg_stock_pcp {
- struct mem_cgroup *cached; /* this never be root cgroup */
- unsigned int nr_pages;
- struct obj_stock task_obj;
- struct obj_stock irq_obj;
struct work_struct work;
unsigned long flags;
#define FLUSHING_CACHED_CHARGE 0
};
-static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock);
+static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock) = {
+ .stock_lock = INIT_LOCAL_LOCK(stock_lock),
+};
static DEFINE_MUTEX(percpu_charge_mutex);
#ifdef CONFIG_MEMCG_KMEM
-static void drain_obj_stock(struct obj_stock *stock);
+static struct obj_cgroup *drain_obj_stock(struct memcg_stock_pcp *stock);
static bool obj_stock_flush_required(struct memcg_stock_pcp *stock,
struct mem_cgroup *root_memcg);
#else
-static inline void drain_obj_stock(struct obj_stock *stock)
+static inline struct obj_cgroup *drain_obj_stock(struct memcg_stock_pcp *stock)
{
+ return NULL;
}
static bool obj_stock_flush_required(struct memcg_stock_pcp *stock,
struct mem_cgroup *root_memcg)
#endif
/*
- * Most kmem_cache_alloc() calls are from user context. The irq disable/enable
- * sequence used in this case to access content from object stock is slow.
- * To optimize for user context access, there are now two object stocks for
- * task context and interrupt context access respectively.
- *
- * The task context object stock can be accessed by disabling preemption only
- * which is cheap in non-preempt kernel. The interrupt context object stock
- * can only be accessed after disabling interrupt. User context code can
- * access interrupt object stock, but not vice versa.
- */
-static inline struct obj_stock *get_obj_stock(unsigned long *pflags)
-{
- struct memcg_stock_pcp *stock;
-
- if (likely(in_task())) {
- *pflags = 0UL;
- preempt_disable();
- stock = this_cpu_ptr(&memcg_stock);
- return &stock->task_obj;
- }
-
- local_irq_save(*pflags);
- stock = this_cpu_ptr(&memcg_stock);
- return &stock->irq_obj;
-}
-
-static inline void put_obj_stock(unsigned long flags)
-{
- if (likely(in_task()))
- preempt_enable();
- else
- local_irq_restore(flags);
-}
-
-/**
* consume_stock: Try to consume stocked charge on this cpu.
* @memcg: memcg to consume from.
* @nr_pages: how many pages to charge.
if (nr_pages > MEMCG_CHARGE_BATCH)
return ret;
- local_irq_save(flags);
+ local_lock_irqsave(&memcg_stock.stock_lock, flags);
stock = this_cpu_ptr(&memcg_stock);
if (memcg == stock->cached && stock->nr_pages >= nr_pages) {
ret = true;
}
- local_irq_restore(flags);
+ local_unlock_irqrestore(&memcg_stock.stock_lock, flags);
return ret;
}
static void drain_local_stock(struct work_struct *dummy)
{
struct memcg_stock_pcp *stock;
+ struct obj_cgroup *old = NULL;
unsigned long flags;
/*
* drain_stock races is that we always operate on local CPU stock
* here with IRQ disabled
*/
- local_irq_save(flags);
+ local_lock_irqsave(&memcg_stock.stock_lock, flags);
stock = this_cpu_ptr(&memcg_stock);
- drain_obj_stock(&stock->irq_obj);
- if (in_task())
- drain_obj_stock(&stock->task_obj);
+ old = drain_obj_stock(stock);
drain_stock(stock);
clear_bit(FLUSHING_CACHED_CHARGE, &stock->flags);
- local_irq_restore(flags);
+ local_unlock_irqrestore(&memcg_stock.stock_lock, flags);
+ if (old)
+ obj_cgroup_put(old);
}
/*
* 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)
+static void __refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
{
struct memcg_stock_pcp *stock;
- unsigned long flags;
-
- local_irq_save(flags);
stock = this_cpu_ptr(&memcg_stock);
if (stock->cached != memcg) { /* reset if necessary */
if (stock->nr_pages > MEMCG_CHARGE_BATCH)
drain_stock(stock);
+}
- local_irq_restore(flags);
+static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
+{
+ unsigned long flags;
+
+ local_lock_irqsave(&memcg_stock.stock_lock, flags);
+ __refill_stock(memcg, nr_pages);
+ local_unlock_irqrestore(&memcg_stock.stock_lock, flags);
}
/*
* as well as workers from this path always operate on the local
* per-cpu data. CPU up doesn't touch memcg_stock at all.
*/
- curcpu = get_cpu();
+ migrate_disable();
+ curcpu = smp_processor_id();
for_each_online_cpu(cpu) {
struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
struct mem_cgroup *memcg;
schedule_work_on(cpu, &stock->work);
}
}
- put_cpu();
+ migrate_enable();
mutex_unlock(&percpu_charge_mutex);
}
struct page_counter *counter;
enum oom_status oom_status;
unsigned long nr_reclaimed;
+ bool passed_oom = false;
bool may_swap = true;
bool drained = false;
unsigned long pflags;
goto force;
/*
- * Unlike in global OOM situations, memcg is not in a physical
- * memory shortage. Allow dying and OOM-killed tasks to
- * bypass the last charges so that they can exit quickly and
- * free their memory.
- */
- if (unlikely(should_force_charge()))
- goto force;
-
- /*
* Prevent unbounded recursion when reclaim operations need to
* allocate memory. This might exceed the limits temporarily,
* but we prefer facilitating memory reclaim and getting back
if (gfp_mask & __GFP_RETRY_MAYFAIL)
goto nomem;
- if (fatal_signal_pending(current))
- goto force;
+ /* Avoid endless loop for tasks bypassed by the oom killer */
+ if (passed_oom && task_is_dying())
+ goto nomem;
/*
* keep retrying as long as the memcg oom killer is able to make
*/
oom_status = mem_cgroup_oom(mem_over_limit, gfp_mask,
get_order(nr_pages * PAGE_SIZE));
- switch (oom_status) {
- case OOM_SUCCESS:
+ if (oom_status == OOM_SUCCESS) {
+ passed_oom = true;
nr_retries = MAX_RECLAIM_RETRIES;
goto retry;
- case OOM_FAILED:
- goto force;
- default:
- goto nomem;
}
nomem:
if (!(gfp_mask & __GFP_NOFAIL))
void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat,
enum node_stat_item idx, int nr)
{
+ struct memcg_stock_pcp *stock;
+ struct obj_cgroup *old = NULL;
unsigned long flags;
- struct obj_stock *stock = get_obj_stock(&flags);
int *bytes;
+ local_lock_irqsave(&memcg_stock.stock_lock, flags);
+ stock = this_cpu_ptr(&memcg_stock);
+
/*
* Save vmstat data in stock and skip vmstat array update unless
* accumulating over a page of vmstat data or when pgdat or idx
* changes.
*/
if (stock->cached_objcg != objcg) {
- drain_obj_stock(stock);
+ old = drain_obj_stock(stock);
obj_cgroup_get(objcg);
stock->nr_bytes = atomic_read(&objcg->nr_charged_bytes)
? atomic_xchg(&objcg->nr_charged_bytes, 0) : 0;
if (nr)
mod_objcg_mlstate(objcg, pgdat, idx, nr);
- put_obj_stock(flags);
+ local_unlock_irqrestore(&memcg_stock.stock_lock, flags);
+ if (old)
+ obj_cgroup_put(old);
}
static bool consume_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes)
{
+ struct memcg_stock_pcp *stock;
unsigned long flags;
- struct obj_stock *stock = get_obj_stock(&flags);
bool ret = false;
+ local_lock_irqsave(&memcg_stock.stock_lock, flags);
+
+ stock = this_cpu_ptr(&memcg_stock);
if (objcg == stock->cached_objcg && stock->nr_bytes >= nr_bytes) {
stock->nr_bytes -= nr_bytes;
ret = true;
}
- put_obj_stock(flags);
+ local_unlock_irqrestore(&memcg_stock.stock_lock, flags);
return ret;
}
-static void drain_obj_stock(struct obj_stock *stock)
+static struct obj_cgroup *drain_obj_stock(struct memcg_stock_pcp *stock)
{
struct obj_cgroup *old = stock->cached_objcg;
if (!old)
- return;
+ return NULL;
if (stock->nr_bytes) {
unsigned int nr_pages = stock->nr_bytes >> PAGE_SHIFT;
unsigned int nr_bytes = stock->nr_bytes & (PAGE_SIZE - 1);
- if (nr_pages)
- obj_cgroup_uncharge_pages(old, nr_pages);
+ if (nr_pages) {
+ struct mem_cgroup *memcg;
+
+ memcg = get_mem_cgroup_from_objcg(old);
+
+ if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
+ page_counter_uncharge(&memcg->kmem, nr_pages);
+
+ __refill_stock(memcg, nr_pages);
+
+ css_put(&memcg->css);
+ }
/*
* The leftover is flushed to the centralized per-memcg value.
stock->cached_pgdat = NULL;
}
- obj_cgroup_put(old);
stock->cached_objcg = NULL;
+ /*
+ * The `old' objects needs to be released by the caller via
+ * obj_cgroup_put() outside of memcg_stock_pcp::stock_lock.
+ */
+ return old;
}
static bool obj_stock_flush_required(struct memcg_stock_pcp *stock,
{
struct mem_cgroup *memcg;
- if (in_task() && stock->task_obj.cached_objcg) {
- memcg = obj_cgroup_memcg(stock->task_obj.cached_objcg);
- if (memcg && mem_cgroup_is_descendant(memcg, root_memcg))
- return true;
- }
- if (stock->irq_obj.cached_objcg) {
- memcg = obj_cgroup_memcg(stock->irq_obj.cached_objcg);
+ if (stock->cached_objcg) {
+ memcg = obj_cgroup_memcg(stock->cached_objcg);
if (memcg && mem_cgroup_is_descendant(memcg, root_memcg))
return true;
}
static void refill_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes,
bool allow_uncharge)
{
+ struct memcg_stock_pcp *stock;
+ struct obj_cgroup *old = NULL;
unsigned long flags;
- struct obj_stock *stock = get_obj_stock(&flags);
unsigned int nr_pages = 0;
+ local_lock_irqsave(&memcg_stock.stock_lock, flags);
+
+ stock = this_cpu_ptr(&memcg_stock);
if (stock->cached_objcg != objcg) { /* reset if necessary */
- drain_obj_stock(stock);
+ old = drain_obj_stock(stock);
obj_cgroup_get(objcg);
stock->cached_objcg = objcg;
stock->nr_bytes = atomic_read(&objcg->nr_charged_bytes)
stock->nr_bytes &= (PAGE_SIZE - 1);
}
- put_obj_stock(flags);
+ local_unlock_irqrestore(&memcg_stock.stock_lock, flags);
+ if (old)
+ obj_cgroup_put(old);
if (nr_pages)
obj_cgroup_uncharge_pages(objcg, nr_pages);
return mem_cgroup_force_empty(memcg) ?: nbytes;
}
+#ifdef CONFIG_MEMCG_SWAP
+static int mem_cgroup_force_reclaim(struct cgroup_subsys_state *css,
+ struct cftype *cft, u64 val)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_css(css);
+ unsigned long nr_to_reclaim = val;
+ unsigned long total = 0;
+ int loop;
+
+ for (loop = 0; loop < MEM_CGROUP_MAX_RECLAIM_LOOPS; loop++) {
+ total += try_to_free_mem_cgroup_pages(memcg, nr_to_reclaim,
+ GFP_KERNEL, true);
+
+ /*
+ * If nothing was reclaimed after two attempts, there
+ * may be no reclaimable pages in this hierarchy.
+ * If more than nr_to_reclaim pages were already reclaimed,
+ * finish force reclaim.
+ */
+ if (loop && (!total || total > nr_to_reclaim))
+ break;
+ }
+
+ pr_info("%s: [Mem_reclaim] Loop: %d - Total_reclaimed: %lu - nr_to_reclaim: %lu\n",
+ __func__, loop, total, nr_to_reclaim);
+
+ return total;
+}
+#endif
+
static u64 mem_cgroup_hierarchy_read(struct cgroup_subsys_state *css,
struct cftype *cft)
{
unsigned long val;
if (mem_cgroup_is_root(memcg)) {
- /* mem_cgroup_threshold() calls here from irqsafe context */
- cgroup_rstat_flush_irqsafe(memcg->css.cgroup);
+ mem_cgroup_flush_stats();
val = memcg_page_state(memcg, NR_FILE_PAGES) +
memcg_page_state(memcg, NR_ANON_MAPPED);
if (swap)
}
break;
case RES_SOFT_LIMIT:
- memcg->soft_limit = nr_pages;
- ret = 0;
+ if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
+ ret = -EOPNOTSUPP;
+ } else {
+ memcg->soft_limit = nr_pages;
+ ret = 0;
+ }
break;
}
return ret ?: nbytes;
int nid;
struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
- cgroup_rstat_flush(memcg->css.cgroup);
+ mem_cgroup_flush_stats();
for (stat = stats; stat < stats + ARRAY_SIZE(stats); stat++) {
seq_printf(m, "%s=%lu", stat->name,
BUILD_BUG_ON(ARRAY_SIZE(memcg1_stat_names) != ARRAY_SIZE(memcg1_stats));
- cgroup_rstat_flush(memcg->css.cgroup);
+ mem_cgroup_flush_stats();
for (i = 0; i < ARRAY_SIZE(memcg1_stats); i++) {
unsigned long nr;
struct mem_cgroup *memcg = mem_cgroup_from_css(wb->memcg_css);
struct mem_cgroup *parent;
- cgroup_rstat_flush_irqsafe(memcg->css.cgroup);
+ mem_cgroup_flush_stats();
*pdirty = memcg_page_state(memcg, NR_FILE_DIRTY);
*pwriteback = memcg_page_state(memcg, NR_WRITEBACK);
unsigned int efd, cfd;
struct fd efile;
struct fd cfile;
+ struct dentry *cdentry;
const char *name;
char *endp;
int ret;
+ if (IS_ENABLED(CONFIG_PREEMPT_RT))
+ return -EOPNOTSUPP;
+
buf = strstrip(buf);
efd = simple_strtoul(buf, &endp, 10);
goto out_put_cfile;
/*
+ * The control file must be a regular cgroup1 file. As a regular cgroup
+ * file can't be renamed, it's safe to access its name afterwards.
+ */
+ cdentry = cfile.file->f_path.dentry;
+ if (cdentry->d_sb->s_type != &cgroup_fs_type || !d_is_reg(cdentry)) {
+ ret = -EINVAL;
+ goto out_put_cfile;
+ }
+
+ /*
* Determine the event callbacks and set them in @event. This used
* to be done via struct cftype but cgroup core no longer knows
* about these events. The following is crude but the whole thing
*
* DO NOT ADD NEW FILES.
*/
- name = cfile.file->f_path.dentry->d_name.name;
+ name = cdentry->d_name.name;
if (!strcmp(name, "memory.usage_in_bytes")) {
event->register_event = mem_cgroup_usage_register_event;
* automatically removed on cgroup destruction but the removal is
* asynchronous, so take an extra ref on @css.
*/
- cfile_css = css_tryget_online_from_dir(cfile.file->f_path.dentry->d_parent,
+ cfile_css = css_tryget_online_from_dir(cdentry->d_parent,
&memory_cgrp_subsys);
ret = -EINVAL;
if (IS_ERR(cfile_css))
memcg_wb_domain_size_changed(memcg);
}
-void mem_cgroup_flush_stats(void)
-{
- if (!spin_trylock(&stats_flush_lock))
- return;
-
- cgroup_rstat_flush_irqsafe(root_mem_cgroup->css.cgroup);
- spin_unlock(&stats_flush_lock);
-}
-
-static void flush_memcg_stats_dwork(struct work_struct *w)
-{
- mem_cgroup_flush_stats();
- queue_delayed_work(system_unbound_wq, &stats_flush_dwork, 2UL*HZ);
-}
-
static void mem_cgroup_css_rstat_flush(struct cgroup_subsys_state *css, int cpu)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
int i;
struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
- cgroup_rstat_flush(memcg->css.cgroup);
+ mem_cgroup_flush_stats();
for (i = 0; i < ARRAY_SIZE(memory_stats); i++) {
int nid;
unsigned long nr_pages;
struct mem_cgroup *memcg;
struct obj_cgroup *objcg;
- bool use_objcg = PageMemcgKmem(page);
VM_BUG_ON_PAGE(PageLRU(page), page);
* page memcg or objcg at this point, we have fully
* exclusive access to the page.
*/
- if (use_objcg) {
+ if (PageMemcgKmem(page)) {
objcg = __page_objcg(page);
/*
* This get matches the put at the end of the function and
nr_pages = compound_nr(page);
- if (use_objcg) {
+ if (PageMemcgKmem(page)) {
ug->nr_memory += nr_pages;
ug->nr_kmem += nr_pages;
if (!strcmp(token, "nokmem"))
cgroup_memory_nokmem = true;
}
- return 0;
+ return 1;
}
__setup("cgroup.memory=", cgroup_memory);
* important here to have the interrupts disabled because it is the
* only synchronisation we have for updating the per-CPU variables.
*/
- VM_BUG_ON(!irqs_disabled());
+ memcg_stats_lock();
mem_cgroup_charge_statistics(memcg, page, -nr_entries);
+ memcg_stats_unlock();
memcg_check_events(memcg, page);
css_put(&memcg->css);
.write = mem_cgroup_reset,
.read_u64 = mem_cgroup_read_u64,
},
+ {
+ .name = "force_reclaim",
+ .write_u64 = mem_cgroup_force_reclaim,
+ },
{ }, /* terminate */
};
projects / platform / kernel / linux-rpi.git / blobdiff