1 /* memcontrol.h - Memory Controller
3 * Copyright IBM Corporation, 2007
4 * Author Balbir Singh <balbir@linux.vnet.ibm.com>
6 * Copyright 2007 OpenVZ SWsoft Inc
7 * Author: Pavel Emelianov <xemul@openvz.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
20 #ifndef _LINUX_MEMCONTROL_H
21 #define _LINUX_MEMCONTROL_H
22 #include <linux/cgroup.h>
23 #include <linux/vm_event_item.h>
24 #include <linux/hardirq.h>
25 #include <linux/jump_label.h>
26 #include <linux/page_counter.h>
27 #include <linux/vmpressure.h>
28 #include <linux/eventfd.h>
29 #include <linux/mmzone.h>
30 #include <linux/writeback.h>
31 #include <linux/page-flags.h>
39 * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c,
40 * These two lists should keep in accord with each other.
42 enum mem_cgroup_stat_index {
44 * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
46 MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
47 MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
48 MEM_CGROUP_STAT_RSS_HUGE, /* # of pages charged as anon huge */
49 MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
50 MEM_CGROUP_STAT_DIRTY, /* # of dirty pages in page cache */
51 MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */
52 MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
53 MEM_CGROUP_STAT_NSTATS,
54 /* default hierarchy stats */
55 MEMCG_KERNEL_STACK_KB = MEM_CGROUP_STAT_NSTATS,
56 MEMCG_SLAB_RECLAIMABLE,
57 MEMCG_SLAB_UNRECLAIMABLE,
62 struct mem_cgroup_reclaim_cookie {
65 unsigned int generation;
68 enum mem_cgroup_events_index {
69 MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */
70 MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */
71 MEM_CGROUP_EVENTS_PGFAULT, /* # of page-faults */
72 MEM_CGROUP_EVENTS_PGMAJFAULT, /* # of major page-faults */
73 MEM_CGROUP_EVENTS_NSTATS,
74 /* default hierarchy events */
75 MEMCG_LOW = MEM_CGROUP_EVENTS_NSTATS,
83 * Per memcg event counter is incremented at every pagein/pageout. With THP,
84 * it will be incremated by the number of pages. This counter is used for
85 * for trigger some periodic events. This is straightforward and better
86 * than using jiffies etc. to handle periodic memcg event.
88 enum mem_cgroup_events_target {
89 MEM_CGROUP_TARGET_THRESH,
90 MEM_CGROUP_TARGET_SOFTLIMIT,
91 MEM_CGROUP_TARGET_NUMAINFO,
97 #define MEM_CGROUP_ID_SHIFT 16
98 #define MEM_CGROUP_ID_MAX USHRT_MAX
100 struct mem_cgroup_id {
105 struct mem_cgroup_stat_cpu {
106 long count[MEMCG_NR_STAT];
107 unsigned long events[MEMCG_NR_EVENTS];
108 unsigned long nr_page_events;
109 unsigned long targets[MEM_CGROUP_NTARGETS];
112 struct mem_cgroup_reclaim_iter {
113 struct mem_cgroup *position;
114 /* scan generation, increased every round-trip */
115 unsigned int generation;
119 * per-zone information in memory controller.
121 struct mem_cgroup_per_node {
122 struct lruvec lruvec;
123 unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];
125 struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1];
127 struct rb_node tree_node; /* RB tree node */
128 unsigned long usage_in_excess;/* Set to the value by which */
129 /* the soft limit is exceeded*/
131 struct mem_cgroup *memcg; /* Back pointer, we cannot */
132 /* use container_of */
135 struct mem_cgroup_threshold {
136 struct eventfd_ctx *eventfd;
137 unsigned long threshold;
141 struct mem_cgroup_threshold_ary {
142 /* An array index points to threshold just below or equal to usage. */
143 int current_threshold;
144 /* Size of entries[] */
146 /* Array of thresholds */
147 struct mem_cgroup_threshold entries[0];
150 struct mem_cgroup_thresholds {
151 /* Primary thresholds array */
152 struct mem_cgroup_threshold_ary *primary;
154 * Spare threshold array.
155 * This is needed to make mem_cgroup_unregister_event() "never fail".
156 * It must be able to store at least primary->size - 1 entries.
158 struct mem_cgroup_threshold_ary *spare;
161 enum memcg_kmem_state {
168 * The memory controller data structure. The memory controller controls both
169 * page cache and RSS per cgroup. We would eventually like to provide
170 * statistics based on the statistics developed by Rik Van Riel for clock-pro,
171 * to help the administrator determine what knobs to tune.
174 struct cgroup_subsys_state css;
176 /* Private memcg ID. Used to ID objects that outlive the cgroup */
177 struct mem_cgroup_id id;
179 /* Accounted resources */
180 struct page_counter memory;
181 struct page_counter swap;
183 /* Legacy consumer-oriented counters */
184 struct page_counter memsw;
185 struct page_counter kmem;
186 struct page_counter tcpmem;
188 /* Normal memory consumption range */
192 /* Range enforcement for interrupt charges */
193 struct work_struct high_work;
195 unsigned long soft_limit;
197 /* vmpressure notifications */
198 struct vmpressure vmpressure;
201 * Should the accounting and control be hierarchical, per subtree?
205 /* protected by memcg_oom_lock */
210 /* OOM-Killer disable */
211 int oom_kill_disable;
213 /* handle for "memory.events" */
214 struct cgroup_file events_file;
216 /* protect arrays of thresholds */
217 struct mutex thresholds_lock;
219 /* thresholds for memory usage. RCU-protected */
220 struct mem_cgroup_thresholds thresholds;
222 /* thresholds for mem+swap usage. RCU-protected */
223 struct mem_cgroup_thresholds memsw_thresholds;
225 /* For oom notifier event fd */
226 struct list_head oom_notify;
229 * Should we move charges of a task when a task is moved into this
230 * mem_cgroup ? And what type of charges should we move ?
232 unsigned long move_charge_at_immigrate;
234 * set > 0 if pages under this cgroup are moving to other cgroup.
236 atomic_t moving_account;
237 /* taken only while moving_account > 0 */
238 spinlock_t move_lock;
239 struct task_struct *move_lock_task;
240 unsigned long move_lock_flags;
244 struct mem_cgroup_stat_cpu __percpu *stat;
246 unsigned long socket_pressure;
248 /* Legacy tcp memory accounting */
253 /* Index in the kmem_cache->memcg_params.memcg_caches array */
255 enum memcg_kmem_state kmem_state;
256 struct list_head kmem_caches;
259 int last_scanned_node;
261 nodemask_t scan_nodes;
262 atomic_t numainfo_events;
263 atomic_t numainfo_updating;
266 #ifdef CONFIG_CGROUP_WRITEBACK
267 struct list_head cgwb_list;
268 struct wb_domain cgwb_domain;
271 /* List of events which userspace want to receive */
272 struct list_head event_list;
273 spinlock_t event_list_lock;
275 struct mem_cgroup_per_node *nodeinfo[0];
276 /* WARNING: nodeinfo must be the last member here */
279 extern struct mem_cgroup *root_mem_cgroup;
281 static inline bool mem_cgroup_disabled(void)
283 return !cgroup_subsys_enabled(memory_cgrp_subsys);
287 * mem_cgroup_events - count memory events against a cgroup
288 * @memcg: the memory cgroup
289 * @idx: the event index
290 * @nr: the number of events to account for
292 static inline void mem_cgroup_events(struct mem_cgroup *memcg,
293 enum mem_cgroup_events_index idx,
296 this_cpu_add(memcg->stat->events[idx], nr);
297 cgroup_file_notify(&memcg->events_file);
300 bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg);
302 int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
303 gfp_t gfp_mask, struct mem_cgroup **memcgp,
305 void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
306 bool lrucare, bool compound);
307 void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg,
309 void mem_cgroup_uncharge(struct page *page);
310 void mem_cgroup_uncharge_list(struct list_head *page_list);
312 void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
314 static struct mem_cgroup_per_node *
315 mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid)
317 return memcg->nodeinfo[nid];
321 * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone
322 * @node: node of the wanted lruvec
323 * @memcg: memcg of the wanted lruvec
325 * Returns the lru list vector holding pages for a given @node or a given
326 * @memcg and @zone. This can be the node lruvec, if the memory controller
329 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
330 struct mem_cgroup *memcg)
332 struct mem_cgroup_per_node *mz;
333 struct lruvec *lruvec;
335 if (mem_cgroup_disabled()) {
336 lruvec = node_lruvec(pgdat);
340 mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id);
341 lruvec = &mz->lruvec;
344 * Since a node can be onlined after the mem_cgroup was created,
345 * we have to be prepared to initialize lruvec->pgdat here;
346 * and if offlined then reonlined, we need to reinitialize it.
348 if (unlikely(lruvec->pgdat != pgdat))
349 lruvec->pgdat = pgdat;
353 struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
355 bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
356 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
359 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
360 return css ? container_of(css, struct mem_cgroup, css) : NULL;
363 #define mem_cgroup_from_counter(counter, member) \
364 container_of(counter, struct mem_cgroup, member)
366 struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
368 struct mem_cgroup_reclaim_cookie *);
369 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
370 int mem_cgroup_scan_tasks(struct mem_cgroup *,
371 int (*)(struct task_struct *, void *), void *);
373 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
375 if (mem_cgroup_disabled())
380 struct mem_cgroup *mem_cgroup_from_id(unsigned short id);
383 * parent_mem_cgroup - find the accounting parent of a memcg
384 * @memcg: memcg whose parent to find
386 * Returns the parent memcg, or NULL if this is the root or the memory
387 * controller is in legacy no-hierarchy mode.
389 static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
391 if (!memcg->memory.parent)
393 return mem_cgroup_from_counter(memcg->memory.parent, memory);
396 static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
397 struct mem_cgroup *root)
401 if (!root->use_hierarchy)
403 return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
406 static inline bool mm_match_cgroup(struct mm_struct *mm,
407 struct mem_cgroup *memcg)
409 struct mem_cgroup *task_memcg;
413 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
415 match = mem_cgroup_is_descendant(task_memcg, memcg);
420 struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page);
421 ino_t page_cgroup_ino(struct page *page);
423 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
425 if (mem_cgroup_disabled())
427 return !!(memcg->css.flags & CSS_ONLINE);
431 * For memory reclaim.
433 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
435 void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
436 int zid, int nr_pages);
438 unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
439 int nid, unsigned int lru_mask);
442 unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
444 struct mem_cgroup_per_node *mz;
445 unsigned long nr_pages = 0;
448 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
449 for (zid = 0; zid < MAX_NR_ZONES; zid++)
450 nr_pages += mz->lru_zone_size[zid][lru];
455 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
456 enum lru_list lru, int zone_idx)
458 struct mem_cgroup_per_node *mz;
460 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
461 return mz->lru_zone_size[zone_idx][lru];
464 void mem_cgroup_handle_over_high(void);
466 unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg);
468 void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
469 struct task_struct *p);
471 static inline void mem_cgroup_oom_enable(void)
473 WARN_ON(current->memcg_may_oom);
474 current->memcg_may_oom = 1;
477 static inline void mem_cgroup_oom_disable(void)
479 WARN_ON(!current->memcg_may_oom);
480 current->memcg_may_oom = 0;
483 static inline bool task_in_memcg_oom(struct task_struct *p)
485 return p->memcg_in_oom;
488 bool mem_cgroup_oom_synchronize(bool wait);
490 #ifdef CONFIG_MEMCG_SWAP
491 extern int do_swap_account;
494 void lock_page_memcg(struct page *page);
495 void unlock_page_memcg(struct page *page);
498 * mem_cgroup_update_page_stat - update page state statistics
500 * @idx: page state item to account
501 * @val: number of pages (positive or negative)
503 * The @page must be locked or the caller must use lock_page_memcg()
504 * to prevent double accounting when the page is concurrently being
505 * moved to another memcg:
507 * lock_page(page) or lock_page_memcg(page)
508 * if (TestClearPageState(page))
509 * mem_cgroup_update_page_stat(page, state, -1);
510 * unlock_page(page) or unlock_page_memcg(page)
512 static inline void mem_cgroup_update_page_stat(struct page *page,
513 enum mem_cgroup_stat_index idx, int val)
515 VM_BUG_ON(!(rcu_read_lock_held() || PageLocked(page)));
517 if (page->mem_cgroup)
518 this_cpu_add(page->mem_cgroup->stat->count[idx], val);
521 static inline void mem_cgroup_inc_page_stat(struct page *page,
522 enum mem_cgroup_stat_index idx)
524 mem_cgroup_update_page_stat(page, idx, 1);
527 static inline void mem_cgroup_dec_page_stat(struct page *page,
528 enum mem_cgroup_stat_index idx)
530 mem_cgroup_update_page_stat(page, idx, -1);
533 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
535 unsigned long *total_scanned);
537 static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
538 enum vm_event_item idx)
540 struct mem_cgroup *memcg;
542 if (mem_cgroup_disabled())
546 memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
547 if (unlikely(!memcg))
552 this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]);
555 this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]);
563 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
564 void mem_cgroup_split_huge_fixup(struct page *head);
567 #else /* CONFIG_MEMCG */
569 #define MEM_CGROUP_ID_SHIFT 0
570 #define MEM_CGROUP_ID_MAX 0
574 static inline bool mem_cgroup_disabled(void)
579 static inline void mem_cgroup_events(struct mem_cgroup *memcg,
580 enum mem_cgroup_events_index idx,
585 static inline bool mem_cgroup_low(struct mem_cgroup *root,
586 struct mem_cgroup *memcg)
591 static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
593 struct mem_cgroup **memcgp,
600 static inline void mem_cgroup_commit_charge(struct page *page,
601 struct mem_cgroup *memcg,
602 bool lrucare, bool compound)
606 static inline void mem_cgroup_cancel_charge(struct page *page,
607 struct mem_cgroup *memcg,
612 static inline void mem_cgroup_uncharge(struct page *page)
616 static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
620 static inline void mem_cgroup_migrate(struct page *old, struct page *new)
624 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
625 struct mem_cgroup *memcg)
627 return node_lruvec(pgdat);
630 static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
631 struct pglist_data *pgdat)
633 return &pgdat->lruvec;
636 static inline bool mm_match_cgroup(struct mm_struct *mm,
637 struct mem_cgroup *memcg)
642 static inline bool task_in_mem_cgroup(struct task_struct *task,
643 const struct mem_cgroup *memcg)
648 static inline struct mem_cgroup *
649 mem_cgroup_iter(struct mem_cgroup *root,
650 struct mem_cgroup *prev,
651 struct mem_cgroup_reclaim_cookie *reclaim)
656 static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
657 struct mem_cgroup *prev)
661 static inline int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
662 int (*fn)(struct task_struct *, void *), void *arg)
667 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
672 static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
675 /* XXX: This should always return root_mem_cgroup */
679 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
684 static inline unsigned long
685 mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
690 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
691 enum lru_list lru, int zone_idx)
696 static inline unsigned long
697 mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
698 int nid, unsigned int lru_mask)
703 static inline unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg)
709 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
713 static inline void lock_page_memcg(struct page *page)
717 static inline void unlock_page_memcg(struct page *page)
721 static inline void mem_cgroup_handle_over_high(void)
725 static inline void mem_cgroup_oom_enable(void)
729 static inline void mem_cgroup_oom_disable(void)
733 static inline bool task_in_memcg_oom(struct task_struct *p)
738 static inline bool mem_cgroup_oom_synchronize(bool wait)
743 static inline void mem_cgroup_update_page_stat(struct page *page,
744 enum mem_cgroup_stat_index idx,
749 static inline void mem_cgroup_inc_page_stat(struct page *page,
750 enum mem_cgroup_stat_index idx)
754 static inline void mem_cgroup_dec_page_stat(struct page *page,
755 enum mem_cgroup_stat_index idx)
760 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
762 unsigned long *total_scanned)
767 static inline void mem_cgroup_split_huge_fixup(struct page *head)
772 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
775 #endif /* CONFIG_MEMCG */
777 #ifdef CONFIG_CGROUP_WRITEBACK
779 struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg);
780 struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
781 void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
782 unsigned long *pheadroom, unsigned long *pdirty,
783 unsigned long *pwriteback);
785 #else /* CONFIG_CGROUP_WRITEBACK */
787 static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb)
792 static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
793 unsigned long *pfilepages,
794 unsigned long *pheadroom,
795 unsigned long *pdirty,
796 unsigned long *pwriteback)
800 #endif /* CONFIG_CGROUP_WRITEBACK */
803 bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
804 void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
806 extern struct static_key_false memcg_sockets_enabled_key;
807 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
808 void mem_cgroup_sk_alloc(struct sock *sk);
809 void mem_cgroup_sk_free(struct sock *sk);
810 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
812 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure)
815 if (time_before(jiffies, memcg->socket_pressure))
817 } while ((memcg = parent_mem_cgroup(memcg)));
821 #define mem_cgroup_sockets_enabled 0
822 static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
823 static inline void mem_cgroup_sk_free(struct sock *sk) { };
824 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
830 struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep);
831 void memcg_kmem_put_cache(struct kmem_cache *cachep);
832 int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
833 struct mem_cgroup *memcg);
834 int memcg_kmem_charge(struct page *page, gfp_t gfp, int order);
835 void memcg_kmem_uncharge(struct page *page, int order);
837 #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
838 extern struct static_key_false memcg_kmem_enabled_key;
839 extern struct workqueue_struct *memcg_kmem_cache_wq;
841 extern int memcg_nr_cache_ids;
842 void memcg_get_cache_ids(void);
843 void memcg_put_cache_ids(void);
846 * Helper macro to loop through all memcg-specific caches. Callers must still
847 * check if the cache is valid (it is either valid or NULL).
848 * the slab_mutex must be held when looping through those caches
850 #define for_each_memcg_cache_index(_idx) \
851 for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++)
853 static inline bool memcg_kmem_enabled(void)
855 return static_branch_unlikely(&memcg_kmem_enabled_key);
859 * helper for accessing a memcg's index. It will be used as an index in the
860 * child cache array in kmem_cache, and also to derive its name. This function
861 * will return -1 when this is not a kmem-limited memcg.
863 static inline int memcg_cache_id(struct mem_cgroup *memcg)
865 return memcg ? memcg->kmemcg_id : -1;
869 * memcg_kmem_update_page_stat - update kmem page state statistics
871 * @idx: page state item to account
872 * @val: number of pages (positive or negative)
874 static inline void memcg_kmem_update_page_stat(struct page *page,
875 enum mem_cgroup_stat_index idx, int val)
877 if (memcg_kmem_enabled() && page->mem_cgroup)
878 this_cpu_add(page->mem_cgroup->stat->count[idx], val);
882 #define for_each_memcg_cache_index(_idx) \
885 static inline bool memcg_kmem_enabled(void)
890 static inline int memcg_cache_id(struct mem_cgroup *memcg)
895 static inline void memcg_get_cache_ids(void)
899 static inline void memcg_put_cache_ids(void)
903 static inline void memcg_kmem_update_page_stat(struct page *page,
904 enum mem_cgroup_stat_index idx, int val)
907 #endif /* CONFIG_MEMCG && !CONFIG_SLOB */
909 #endif /* _LINUX_MEMCONTROL_H */