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>
38 /* Cgroup-specific page state, on top of universal node page state */
39 enum memcg_stat_item {
40 MEMCG_CACHE = NR_VM_NODE_STAT_ITEMS,
45 /* XXX: why are these zone and not node counters? */
46 MEMCG_KERNEL_STACK_KB,
47 MEMCG_SLAB_RECLAIMABLE,
48 MEMCG_SLAB_UNRECLAIMABLE,
52 /* Cgroup-specific events, on top of universal VM events */
53 enum memcg_event_item {
54 MEMCG_LOW = NR_VM_EVENT_ITEMS,
61 struct mem_cgroup_reclaim_cookie {
64 unsigned int generation;
69 #define MEM_CGROUP_ID_SHIFT 16
70 #define MEM_CGROUP_ID_MAX USHRT_MAX
72 struct mem_cgroup_id {
78 * Per memcg event counter is incremented at every pagein/pageout. With THP,
79 * it will be incremated by the number of pages. This counter is used for
80 * for trigger some periodic events. This is straightforward and better
81 * than using jiffies etc. to handle periodic memcg event.
83 enum mem_cgroup_events_target {
84 MEM_CGROUP_TARGET_THRESH,
85 MEM_CGROUP_TARGET_SOFTLIMIT,
86 MEM_CGROUP_TARGET_NUMAINFO,
90 struct mem_cgroup_stat_cpu {
91 long count[MEMCG_NR_STAT];
92 unsigned long events[MEMCG_NR_EVENTS];
93 unsigned long nr_page_events;
94 unsigned long targets[MEM_CGROUP_NTARGETS];
97 struct mem_cgroup_reclaim_iter {
98 struct mem_cgroup *position;
99 /* scan generation, increased every round-trip */
100 unsigned int generation;
104 * per-zone information in memory controller.
106 struct mem_cgroup_per_node {
107 struct lruvec lruvec;
108 unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];
110 struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1];
112 struct rb_node tree_node; /* RB tree node */
113 unsigned long usage_in_excess;/* Set to the value by which */
114 /* the soft limit is exceeded*/
116 struct mem_cgroup *memcg; /* Back pointer, we cannot */
117 /* use container_of */
120 struct mem_cgroup_threshold {
121 struct eventfd_ctx *eventfd;
122 unsigned long threshold;
126 struct mem_cgroup_threshold_ary {
127 /* An array index points to threshold just below or equal to usage. */
128 int current_threshold;
129 /* Size of entries[] */
131 /* Array of thresholds */
132 struct mem_cgroup_threshold entries[0];
135 struct mem_cgroup_thresholds {
136 /* Primary thresholds array */
137 struct mem_cgroup_threshold_ary *primary;
139 * Spare threshold array.
140 * This is needed to make mem_cgroup_unregister_event() "never fail".
141 * It must be able to store at least primary->size - 1 entries.
143 struct mem_cgroup_threshold_ary *spare;
146 enum memcg_kmem_state {
153 * The memory controller data structure. The memory controller controls both
154 * page cache and RSS per cgroup. We would eventually like to provide
155 * statistics based on the statistics developed by Rik Van Riel for clock-pro,
156 * to help the administrator determine what knobs to tune.
159 struct cgroup_subsys_state css;
161 /* Private memcg ID. Used to ID objects that outlive the cgroup */
162 struct mem_cgroup_id id;
164 /* Accounted resources */
165 struct page_counter memory;
166 struct page_counter swap;
168 /* Legacy consumer-oriented counters */
169 struct page_counter memsw;
170 struct page_counter kmem;
171 struct page_counter tcpmem;
173 /* Normal memory consumption range */
177 /* Range enforcement for interrupt charges */
178 struct work_struct high_work;
180 unsigned long soft_limit;
182 /* vmpressure notifications */
183 struct vmpressure vmpressure;
186 * Should the accounting and control be hierarchical, per subtree?
190 /* protected by memcg_oom_lock */
195 /* OOM-Killer disable */
196 int oom_kill_disable;
198 /* handle for "memory.events" */
199 struct cgroup_file events_file;
201 /* protect arrays of thresholds */
202 struct mutex thresholds_lock;
204 /* thresholds for memory usage. RCU-protected */
205 struct mem_cgroup_thresholds thresholds;
207 /* thresholds for mem+swap usage. RCU-protected */
208 struct mem_cgroup_thresholds memsw_thresholds;
210 /* For oom notifier event fd */
211 struct list_head oom_notify;
214 * Should we move charges of a task when a task is moved into this
215 * mem_cgroup ? And what type of charges should we move ?
217 unsigned long move_charge_at_immigrate;
219 * set > 0 if pages under this cgroup are moving to other cgroup.
221 atomic_t moving_account;
222 /* taken only while moving_account > 0 */
223 spinlock_t move_lock;
224 struct task_struct *move_lock_task;
225 unsigned long move_lock_flags;
229 struct mem_cgroup_stat_cpu __percpu *stat;
231 unsigned long socket_pressure;
233 /* Legacy tcp memory accounting */
238 /* Index in the kmem_cache->memcg_params.memcg_caches array */
240 enum memcg_kmem_state kmem_state;
241 struct list_head kmem_caches;
244 int last_scanned_node;
246 nodemask_t scan_nodes;
247 atomic_t numainfo_events;
248 atomic_t numainfo_updating;
251 #ifdef CONFIG_CGROUP_WRITEBACK
252 struct list_head cgwb_list;
253 struct wb_domain cgwb_domain;
256 /* List of events which userspace want to receive */
257 struct list_head event_list;
258 spinlock_t event_list_lock;
260 struct mem_cgroup_per_node *nodeinfo[0];
261 /* WARNING: nodeinfo must be the last member here */
264 extern struct mem_cgroup *root_mem_cgroup;
266 static inline bool mem_cgroup_disabled(void)
268 return !cgroup_subsys_enabled(memory_cgrp_subsys);
271 static inline void mem_cgroup_event(struct mem_cgroup *memcg,
272 enum memcg_event_item event)
274 this_cpu_inc(memcg->stat->events[event]);
275 cgroup_file_notify(&memcg->events_file);
278 bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg);
280 int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
281 gfp_t gfp_mask, struct mem_cgroup **memcgp,
283 void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
284 bool lrucare, bool compound);
285 void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg,
287 void mem_cgroup_uncharge(struct page *page);
288 void mem_cgroup_uncharge_list(struct list_head *page_list);
290 void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
292 static struct mem_cgroup_per_node *
293 mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid)
295 return memcg->nodeinfo[nid];
299 * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone
300 * @node: node of the wanted lruvec
301 * @memcg: memcg of the wanted lruvec
303 * Returns the lru list vector holding pages for a given @node or a given
304 * @memcg and @zone. This can be the node lruvec, if the memory controller
307 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
308 struct mem_cgroup *memcg)
310 struct mem_cgroup_per_node *mz;
311 struct lruvec *lruvec;
313 if (mem_cgroup_disabled()) {
314 lruvec = node_lruvec(pgdat);
318 mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id);
319 lruvec = &mz->lruvec;
322 * Since a node can be onlined after the mem_cgroup was created,
323 * we have to be prepared to initialize lruvec->pgdat here;
324 * and if offlined then reonlined, we need to reinitialize it.
326 if (unlikely(lruvec->pgdat != pgdat))
327 lruvec->pgdat = pgdat;
331 struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
333 bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
334 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
337 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
338 return css ? container_of(css, struct mem_cgroup, css) : NULL;
341 #define mem_cgroup_from_counter(counter, member) \
342 container_of(counter, struct mem_cgroup, member)
344 struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
346 struct mem_cgroup_reclaim_cookie *);
347 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
348 int mem_cgroup_scan_tasks(struct mem_cgroup *,
349 int (*)(struct task_struct *, void *), void *);
351 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
353 if (mem_cgroup_disabled())
358 struct mem_cgroup *mem_cgroup_from_id(unsigned short id);
360 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
362 struct mem_cgroup_per_node *mz;
364 if (mem_cgroup_disabled())
367 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
372 * parent_mem_cgroup - find the accounting parent of a memcg
373 * @memcg: memcg whose parent to find
375 * Returns the parent memcg, or NULL if this is the root or the memory
376 * controller is in legacy no-hierarchy mode.
378 static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
380 if (!memcg->memory.parent)
382 return mem_cgroup_from_counter(memcg->memory.parent, memory);
385 static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
386 struct mem_cgroup *root)
390 if (!root->use_hierarchy)
392 return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
395 static inline bool mm_match_cgroup(struct mm_struct *mm,
396 struct mem_cgroup *memcg)
398 struct mem_cgroup *task_memcg;
402 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
404 match = mem_cgroup_is_descendant(task_memcg, memcg);
409 struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page);
410 ino_t page_cgroup_ino(struct page *page);
412 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
414 if (mem_cgroup_disabled())
416 return !!(memcg->css.flags & CSS_ONLINE);
420 * For memory reclaim.
422 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
424 void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
425 int zid, int nr_pages);
427 unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
428 int nid, unsigned int lru_mask);
431 unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
433 struct mem_cgroup_per_node *mz;
434 unsigned long nr_pages = 0;
437 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
438 for (zid = 0; zid < MAX_NR_ZONES; zid++)
439 nr_pages += mz->lru_zone_size[zid][lru];
444 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
445 enum lru_list lru, int zone_idx)
447 struct mem_cgroup_per_node *mz;
449 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
450 return mz->lru_zone_size[zone_idx][lru];
453 void mem_cgroup_handle_over_high(void);
455 unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg);
457 void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
458 struct task_struct *p);
460 static inline void mem_cgroup_oom_enable(void)
462 WARN_ON(current->memcg_may_oom);
463 current->memcg_may_oom = 1;
466 static inline void mem_cgroup_oom_disable(void)
468 WARN_ON(!current->memcg_may_oom);
469 current->memcg_may_oom = 0;
472 static inline bool task_in_memcg_oom(struct task_struct *p)
474 return p->memcg_in_oom;
477 bool mem_cgroup_oom_synchronize(bool wait);
479 #ifdef CONFIG_MEMCG_SWAP
480 extern int do_swap_account;
483 void lock_page_memcg(struct page *page);
484 void unlock_page_memcg(struct page *page);
486 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
487 enum memcg_stat_item idx)
492 for_each_possible_cpu(cpu)
493 val += per_cpu(memcg->stat->count[idx], cpu);
501 static inline void mod_memcg_state(struct mem_cgroup *memcg,
502 enum memcg_stat_item idx, int val)
504 if (!mem_cgroup_disabled())
505 this_cpu_add(memcg->stat->count[idx], val);
508 static inline void inc_memcg_state(struct mem_cgroup *memcg,
509 enum memcg_stat_item idx)
511 mod_memcg_state(memcg, idx, 1);
514 static inline void dec_memcg_state(struct mem_cgroup *memcg,
515 enum memcg_stat_item idx)
517 mod_memcg_state(memcg, idx, -1);
521 * mod_memcg_page_state - update page state statistics
523 * @idx: page state item to account
524 * @val: number of pages (positive or negative)
526 * The @page must be locked or the caller must use lock_page_memcg()
527 * to prevent double accounting when the page is concurrently being
528 * moved to another memcg:
530 * lock_page(page) or lock_page_memcg(page)
531 * if (TestClearPageState(page))
532 * mod_memcg_page_state(page, state, -1);
533 * unlock_page(page) or unlock_page_memcg(page)
535 * Kernel pages are an exception to this, since they'll never move.
537 static inline void mod_memcg_page_state(struct page *page,
538 enum memcg_stat_item idx, int val)
540 if (page->mem_cgroup)
541 mod_memcg_state(page->mem_cgroup, idx, val);
544 static inline void inc_memcg_page_state(struct page *page,
545 enum memcg_stat_item idx)
547 mod_memcg_page_state(page, idx, 1);
550 static inline void dec_memcg_page_state(struct page *page,
551 enum memcg_stat_item idx)
553 mod_memcg_page_state(page, idx, -1);
556 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
558 unsigned long *total_scanned);
560 static inline void count_memcg_events(struct mem_cgroup *memcg,
561 enum vm_event_item idx,
564 if (!mem_cgroup_disabled())
565 this_cpu_add(memcg->stat->events[idx], count);
568 static inline void count_memcg_page_event(struct page *page,
569 enum memcg_stat_item idx)
571 if (page->mem_cgroup)
572 count_memcg_events(page->mem_cgroup, idx, 1);
575 static inline void count_memcg_event_mm(struct mm_struct *mm,
576 enum vm_event_item idx)
578 struct mem_cgroup *memcg;
580 if (mem_cgroup_disabled())
584 memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
586 this_cpu_inc(memcg->stat->events[idx]);
589 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
590 void mem_cgroup_split_huge_fixup(struct page *head);
593 #else /* CONFIG_MEMCG */
595 #define MEM_CGROUP_ID_SHIFT 0
596 #define MEM_CGROUP_ID_MAX 0
600 static inline bool mem_cgroup_disabled(void)
605 static inline void mem_cgroup_event(struct mem_cgroup *memcg,
606 enum memcg_event_item event)
610 static inline bool mem_cgroup_low(struct mem_cgroup *root,
611 struct mem_cgroup *memcg)
616 static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
618 struct mem_cgroup **memcgp,
625 static inline void mem_cgroup_commit_charge(struct page *page,
626 struct mem_cgroup *memcg,
627 bool lrucare, bool compound)
631 static inline void mem_cgroup_cancel_charge(struct page *page,
632 struct mem_cgroup *memcg,
637 static inline void mem_cgroup_uncharge(struct page *page)
641 static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
645 static inline void mem_cgroup_migrate(struct page *old, struct page *new)
649 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
650 struct mem_cgroup *memcg)
652 return node_lruvec(pgdat);
655 static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
656 struct pglist_data *pgdat)
658 return &pgdat->lruvec;
661 static inline bool mm_match_cgroup(struct mm_struct *mm,
662 struct mem_cgroup *memcg)
667 static inline bool task_in_mem_cgroup(struct task_struct *task,
668 const struct mem_cgroup *memcg)
673 static inline struct mem_cgroup *
674 mem_cgroup_iter(struct mem_cgroup *root,
675 struct mem_cgroup *prev,
676 struct mem_cgroup_reclaim_cookie *reclaim)
681 static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
682 struct mem_cgroup *prev)
686 static inline int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
687 int (*fn)(struct task_struct *, void *), void *arg)
692 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
697 static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
700 /* XXX: This should always return root_mem_cgroup */
704 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
709 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
714 static inline unsigned long
715 mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
720 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
721 enum lru_list lru, int zone_idx)
726 static inline unsigned long
727 mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
728 int nid, unsigned int lru_mask)
733 static inline unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg)
739 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
743 static inline void lock_page_memcg(struct page *page)
747 static inline void unlock_page_memcg(struct page *page)
751 static inline void mem_cgroup_handle_over_high(void)
755 static inline void mem_cgroup_oom_enable(void)
759 static inline void mem_cgroup_oom_disable(void)
763 static inline bool task_in_memcg_oom(struct task_struct *p)
768 static inline bool mem_cgroup_oom_synchronize(bool wait)
773 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
774 enum memcg_stat_item idx)
779 static inline void mod_memcg_state(struct mem_cgroup *memcg,
780 enum memcg_stat_item idx,
785 static inline void inc_memcg_state(struct mem_cgroup *memcg,
786 enum memcg_stat_item idx)
790 static inline void dec_memcg_state(struct mem_cgroup *memcg,
791 enum memcg_stat_item idx)
795 static inline void mod_memcg_page_state(struct page *page,
796 enum memcg_stat_item idx,
801 static inline void inc_memcg_page_state(struct page *page,
802 enum memcg_stat_item idx)
806 static inline void dec_memcg_page_state(struct page *page,
807 enum memcg_stat_item idx)
812 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
814 unsigned long *total_scanned)
819 static inline void mem_cgroup_split_huge_fixup(struct page *head)
823 static inline void count_memcg_events(struct mem_cgroup *memcg,
824 enum vm_event_item idx,
829 static inline void count_memcg_page_event(struct page *page,
830 enum memcg_stat_item idx)
835 void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx)
838 #endif /* CONFIG_MEMCG */
840 #ifdef CONFIG_CGROUP_WRITEBACK
842 struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg);
843 struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
844 void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
845 unsigned long *pheadroom, unsigned long *pdirty,
846 unsigned long *pwriteback);
848 #else /* CONFIG_CGROUP_WRITEBACK */
850 static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb)
855 static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
856 unsigned long *pfilepages,
857 unsigned long *pheadroom,
858 unsigned long *pdirty,
859 unsigned long *pwriteback)
863 #endif /* CONFIG_CGROUP_WRITEBACK */
866 bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
867 void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
869 extern struct static_key_false memcg_sockets_enabled_key;
870 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
871 void mem_cgroup_sk_alloc(struct sock *sk);
872 void mem_cgroup_sk_free(struct sock *sk);
873 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
875 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure)
878 if (time_before(jiffies, memcg->socket_pressure))
880 } while ((memcg = parent_mem_cgroup(memcg)));
884 #define mem_cgroup_sockets_enabled 0
885 static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
886 static inline void mem_cgroup_sk_free(struct sock *sk) { };
887 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
893 struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep);
894 void memcg_kmem_put_cache(struct kmem_cache *cachep);
895 int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
896 struct mem_cgroup *memcg);
897 int memcg_kmem_charge(struct page *page, gfp_t gfp, int order);
898 void memcg_kmem_uncharge(struct page *page, int order);
900 #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
901 extern struct static_key_false memcg_kmem_enabled_key;
902 extern struct workqueue_struct *memcg_kmem_cache_wq;
904 extern int memcg_nr_cache_ids;
905 void memcg_get_cache_ids(void);
906 void memcg_put_cache_ids(void);
909 * Helper macro to loop through all memcg-specific caches. Callers must still
910 * check if the cache is valid (it is either valid or NULL).
911 * the slab_mutex must be held when looping through those caches
913 #define for_each_memcg_cache_index(_idx) \
914 for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++)
916 static inline bool memcg_kmem_enabled(void)
918 return static_branch_unlikely(&memcg_kmem_enabled_key);
922 * helper for accessing a memcg's index. It will be used as an index in the
923 * child cache array in kmem_cache, and also to derive its name. This function
924 * will return -1 when this is not a kmem-limited memcg.
926 static inline int memcg_cache_id(struct mem_cgroup *memcg)
928 return memcg ? memcg->kmemcg_id : -1;
932 * memcg_kmem_update_page_stat - update kmem page state statistics
934 * @idx: page state item to account
935 * @val: number of pages (positive or negative)
937 static inline void memcg_kmem_update_page_stat(struct page *page,
938 enum memcg_stat_item idx, int val)
940 if (memcg_kmem_enabled() && page->mem_cgroup)
941 this_cpu_add(page->mem_cgroup->stat->count[idx], val);
945 #define for_each_memcg_cache_index(_idx) \
948 static inline bool memcg_kmem_enabled(void)
953 static inline int memcg_cache_id(struct mem_cgroup *memcg)
958 static inline void memcg_get_cache_ids(void)
962 static inline void memcg_put_cache_ids(void)
966 static inline void memcg_kmem_update_page_stat(struct page *page,
967 enum memcg_stat_item idx, int val)
970 #endif /* CONFIG_MEMCG && !CONFIG_SLOB */
972 #endif /* _LINUX_MEMCONTROL_H */