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_SHMEM, /* # of pages charged as shmem */
50 MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
51 MEM_CGROUP_STAT_DIRTY, /* # of dirty pages in page cache */
52 MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */
53 MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
54 MEM_CGROUP_STAT_NSTATS,
55 /* default hierarchy stats */
56 MEMCG_KERNEL_STACK_KB = MEM_CGROUP_STAT_NSTATS,
57 MEMCG_SLAB_RECLAIMABLE,
58 MEMCG_SLAB_UNRECLAIMABLE,
60 MEMCG_WORKINGSET_REFAULT,
61 MEMCG_WORKINGSET_ACTIVATE,
62 MEMCG_WORKINGSET_NODERECLAIM,
66 struct mem_cgroup_reclaim_cookie {
69 unsigned int generation;
73 * Per memcg event counter is incremented at every pagein/pageout. With THP,
74 * it will be incremated by the number of pages. This counter is used for
75 * for trigger some periodic events. This is straightforward and better
76 * than using jiffies etc. to handle periodic memcg event.
78 enum mem_cgroup_events_target {
79 MEM_CGROUP_TARGET_THRESH,
80 MEM_CGROUP_TARGET_SOFTLIMIT,
81 MEM_CGROUP_TARGET_NUMAINFO,
87 #define MEM_CGROUP_ID_SHIFT 16
88 #define MEM_CGROUP_ID_MAX USHRT_MAX
90 struct mem_cgroup_id {
95 /* Cgroup-specific events, on top of universal VM events */
96 enum memcg_event_item {
97 MEMCG_LOW = NR_VM_EVENT_ITEMS,
104 struct mem_cgroup_stat_cpu {
105 long count[MEMCG_NR_STAT];
106 unsigned long events[MEMCG_NR_EVENTS];
107 unsigned long nr_page_events;
108 unsigned long targets[MEM_CGROUP_NTARGETS];
111 struct mem_cgroup_reclaim_iter {
112 struct mem_cgroup *position;
113 /* scan generation, increased every round-trip */
114 unsigned int generation;
118 * per-zone information in memory controller.
120 struct mem_cgroup_per_node {
121 struct lruvec lruvec;
122 unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];
124 struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1];
126 struct rb_node tree_node; /* RB tree node */
127 unsigned long usage_in_excess;/* Set to the value by which */
128 /* the soft limit is exceeded*/
130 struct mem_cgroup *memcg; /* Back pointer, we cannot */
131 /* use container_of */
134 struct mem_cgroup_threshold {
135 struct eventfd_ctx *eventfd;
136 unsigned long threshold;
140 struct mem_cgroup_threshold_ary {
141 /* An array index points to threshold just below or equal to usage. */
142 int current_threshold;
143 /* Size of entries[] */
145 /* Array of thresholds */
146 struct mem_cgroup_threshold entries[0];
149 struct mem_cgroup_thresholds {
150 /* Primary thresholds array */
151 struct mem_cgroup_threshold_ary *primary;
153 * Spare threshold array.
154 * This is needed to make mem_cgroup_unregister_event() "never fail".
155 * It must be able to store at least primary->size - 1 entries.
157 struct mem_cgroup_threshold_ary *spare;
160 enum memcg_kmem_state {
167 * The memory controller data structure. The memory controller controls both
168 * page cache and RSS per cgroup. We would eventually like to provide
169 * statistics based on the statistics developed by Rik Van Riel for clock-pro,
170 * to help the administrator determine what knobs to tune.
173 struct cgroup_subsys_state css;
175 /* Private memcg ID. Used to ID objects that outlive the cgroup */
176 struct mem_cgroup_id id;
178 /* Accounted resources */
179 struct page_counter memory;
180 struct page_counter swap;
182 /* Legacy consumer-oriented counters */
183 struct page_counter memsw;
184 struct page_counter kmem;
185 struct page_counter tcpmem;
187 /* Normal memory consumption range */
191 /* Range enforcement for interrupt charges */
192 struct work_struct high_work;
194 unsigned long soft_limit;
196 /* vmpressure notifications */
197 struct vmpressure vmpressure;
200 * Should the accounting and control be hierarchical, per subtree?
204 /* protected by memcg_oom_lock */
209 /* OOM-Killer disable */
210 int oom_kill_disable;
212 /* handle for "memory.events" */
213 struct cgroup_file events_file;
215 /* protect arrays of thresholds */
216 struct mutex thresholds_lock;
218 /* thresholds for memory usage. RCU-protected */
219 struct mem_cgroup_thresholds thresholds;
221 /* thresholds for mem+swap usage. RCU-protected */
222 struct mem_cgroup_thresholds memsw_thresholds;
224 /* For oom notifier event fd */
225 struct list_head oom_notify;
228 * Should we move charges of a task when a task is moved into this
229 * mem_cgroup ? And what type of charges should we move ?
231 unsigned long move_charge_at_immigrate;
233 * set > 0 if pages under this cgroup are moving to other cgroup.
235 atomic_t moving_account;
236 /* taken only while moving_account > 0 */
237 spinlock_t move_lock;
238 struct task_struct *move_lock_task;
239 unsigned long move_lock_flags;
243 struct mem_cgroup_stat_cpu __percpu *stat;
245 unsigned long socket_pressure;
247 /* Legacy tcp memory accounting */
252 /* Index in the kmem_cache->memcg_params.memcg_caches array */
254 enum memcg_kmem_state kmem_state;
255 struct list_head kmem_caches;
258 int last_scanned_node;
260 nodemask_t scan_nodes;
261 atomic_t numainfo_events;
262 atomic_t numainfo_updating;
265 #ifdef CONFIG_CGROUP_WRITEBACK
266 struct list_head cgwb_list;
267 struct wb_domain cgwb_domain;
270 /* List of events which userspace want to receive */
271 struct list_head event_list;
272 spinlock_t event_list_lock;
274 struct mem_cgroup_per_node *nodeinfo[0];
275 /* WARNING: nodeinfo must be the last member here */
278 extern struct mem_cgroup *root_mem_cgroup;
280 static inline bool mem_cgroup_disabled(void)
282 return !cgroup_subsys_enabled(memory_cgrp_subsys);
285 static inline void mem_cgroup_event(struct mem_cgroup *memcg,
286 enum memcg_event_item event)
288 this_cpu_inc(memcg->stat->events[event]);
289 cgroup_file_notify(&memcg->events_file);
292 bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg);
294 int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
295 gfp_t gfp_mask, struct mem_cgroup **memcgp,
297 void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
298 bool lrucare, bool compound);
299 void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg,
301 void mem_cgroup_uncharge(struct page *page);
302 void mem_cgroup_uncharge_list(struct list_head *page_list);
304 void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
306 static struct mem_cgroup_per_node *
307 mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid)
309 return memcg->nodeinfo[nid];
313 * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone
314 * @node: node of the wanted lruvec
315 * @memcg: memcg of the wanted lruvec
317 * Returns the lru list vector holding pages for a given @node or a given
318 * @memcg and @zone. This can be the node lruvec, if the memory controller
321 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
322 struct mem_cgroup *memcg)
324 struct mem_cgroup_per_node *mz;
325 struct lruvec *lruvec;
327 if (mem_cgroup_disabled()) {
328 lruvec = node_lruvec(pgdat);
332 mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id);
333 lruvec = &mz->lruvec;
336 * Since a node can be onlined after the mem_cgroup was created,
337 * we have to be prepared to initialize lruvec->pgdat here;
338 * and if offlined then reonlined, we need to reinitialize it.
340 if (unlikely(lruvec->pgdat != pgdat))
341 lruvec->pgdat = pgdat;
345 struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
347 bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
348 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
351 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
352 return css ? container_of(css, struct mem_cgroup, css) : NULL;
355 #define mem_cgroup_from_counter(counter, member) \
356 container_of(counter, struct mem_cgroup, member)
358 struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
360 struct mem_cgroup_reclaim_cookie *);
361 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
362 int mem_cgroup_scan_tasks(struct mem_cgroup *,
363 int (*)(struct task_struct *, void *), void *);
365 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
367 if (mem_cgroup_disabled())
372 struct mem_cgroup *mem_cgroup_from_id(unsigned short id);
375 * parent_mem_cgroup - find the accounting parent of a memcg
376 * @memcg: memcg whose parent to find
378 * Returns the parent memcg, or NULL if this is the root or the memory
379 * controller is in legacy no-hierarchy mode.
381 static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
383 if (!memcg->memory.parent)
385 return mem_cgroup_from_counter(memcg->memory.parent, memory);
388 static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
389 struct mem_cgroup *root)
393 if (!root->use_hierarchy)
395 return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
398 static inline bool mm_match_cgroup(struct mm_struct *mm,
399 struct mem_cgroup *memcg)
401 struct mem_cgroup *task_memcg;
405 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
407 match = mem_cgroup_is_descendant(task_memcg, memcg);
412 struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page);
413 ino_t page_cgroup_ino(struct page *page);
415 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
417 if (mem_cgroup_disabled())
419 return !!(memcg->css.flags & CSS_ONLINE);
423 * For memory reclaim.
425 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
427 void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
428 int zid, int nr_pages);
430 unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
431 int nid, unsigned int lru_mask);
434 unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
436 struct mem_cgroup_per_node *mz;
437 unsigned long nr_pages = 0;
440 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
441 for (zid = 0; zid < MAX_NR_ZONES; zid++)
442 nr_pages += mz->lru_zone_size[zid][lru];
447 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
448 enum lru_list lru, int zone_idx)
450 struct mem_cgroup_per_node *mz;
452 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
453 return mz->lru_zone_size[zone_idx][lru];
456 void mem_cgroup_handle_over_high(void);
458 unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg);
460 void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
461 struct task_struct *p);
463 static inline void mem_cgroup_oom_enable(void)
465 WARN_ON(current->memcg_may_oom);
466 current->memcg_may_oom = 1;
469 static inline void mem_cgroup_oom_disable(void)
471 WARN_ON(!current->memcg_may_oom);
472 current->memcg_may_oom = 0;
475 static inline bool task_in_memcg_oom(struct task_struct *p)
477 return p->memcg_in_oom;
480 bool mem_cgroup_oom_synchronize(bool wait);
482 #ifdef CONFIG_MEMCG_SWAP
483 extern int do_swap_account;
486 void lock_page_memcg(struct page *page);
487 void unlock_page_memcg(struct page *page);
489 static inline unsigned long mem_cgroup_read_stat(struct mem_cgroup *memcg,
490 enum mem_cgroup_stat_index idx)
495 for_each_possible_cpu(cpu)
496 val += per_cpu(memcg->stat->count[idx], cpu);
504 static inline void mem_cgroup_update_stat(struct mem_cgroup *memcg,
505 enum mem_cgroup_stat_index idx, int val)
507 if (!mem_cgroup_disabled())
508 this_cpu_add(memcg->stat->count[idx], val);
511 static inline void mem_cgroup_inc_stat(struct mem_cgroup *memcg,
512 enum mem_cgroup_stat_index idx)
514 mem_cgroup_update_stat(memcg, idx, 1);
517 static inline void mem_cgroup_dec_stat(struct mem_cgroup *memcg,
518 enum mem_cgroup_stat_index idx)
520 mem_cgroup_update_stat(memcg, idx, -1);
524 * mem_cgroup_update_page_stat - update page state statistics
526 * @idx: page state item to account
527 * @val: number of pages (positive or negative)
529 * The @page must be locked or the caller must use lock_page_memcg()
530 * to prevent double accounting when the page is concurrently being
531 * moved to another memcg:
533 * lock_page(page) or lock_page_memcg(page)
534 * if (TestClearPageState(page))
535 * mem_cgroup_update_page_stat(page, state, -1);
536 * unlock_page(page) or unlock_page_memcg(page)
538 * Kernel pages are an exception to this, since they'll never move.
540 static inline void mem_cgroup_update_page_stat(struct page *page,
541 enum mem_cgroup_stat_index idx, int val)
543 if (page->mem_cgroup)
544 mem_cgroup_update_stat(page->mem_cgroup, idx, val);
547 static inline void mem_cgroup_inc_page_stat(struct page *page,
548 enum mem_cgroup_stat_index idx)
550 mem_cgroup_update_page_stat(page, idx, 1);
553 static inline void mem_cgroup_dec_page_stat(struct page *page,
554 enum mem_cgroup_stat_index idx)
556 mem_cgroup_update_page_stat(page, idx, -1);
559 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
561 unsigned long *total_scanned);
563 static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
564 enum vm_event_item idx)
566 struct mem_cgroup *memcg;
568 if (mem_cgroup_disabled())
572 memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
574 this_cpu_inc(memcg->stat->events[idx]);
577 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
578 void mem_cgroup_split_huge_fixup(struct page *head);
581 #else /* CONFIG_MEMCG */
583 #define MEM_CGROUP_ID_SHIFT 0
584 #define MEM_CGROUP_ID_MAX 0
588 static inline bool mem_cgroup_disabled(void)
593 static inline void mem_cgroup_event(struct mem_cgroup *memcg,
594 enum memcg_event_item event)
598 static inline bool mem_cgroup_low(struct mem_cgroup *root,
599 struct mem_cgroup *memcg)
604 static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
606 struct mem_cgroup **memcgp,
613 static inline void mem_cgroup_commit_charge(struct page *page,
614 struct mem_cgroup *memcg,
615 bool lrucare, bool compound)
619 static inline void mem_cgroup_cancel_charge(struct page *page,
620 struct mem_cgroup *memcg,
625 static inline void mem_cgroup_uncharge(struct page *page)
629 static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
633 static inline void mem_cgroup_migrate(struct page *old, struct page *new)
637 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
638 struct mem_cgroup *memcg)
640 return node_lruvec(pgdat);
643 static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
644 struct pglist_data *pgdat)
646 return &pgdat->lruvec;
649 static inline bool mm_match_cgroup(struct mm_struct *mm,
650 struct mem_cgroup *memcg)
655 static inline bool task_in_mem_cgroup(struct task_struct *task,
656 const struct mem_cgroup *memcg)
661 static inline struct mem_cgroup *
662 mem_cgroup_iter(struct mem_cgroup *root,
663 struct mem_cgroup *prev,
664 struct mem_cgroup_reclaim_cookie *reclaim)
669 static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
670 struct mem_cgroup *prev)
674 static inline int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
675 int (*fn)(struct task_struct *, void *), void *arg)
680 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
685 static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
688 /* XXX: This should always return root_mem_cgroup */
692 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
697 static inline unsigned long
698 mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
703 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
704 enum lru_list lru, int zone_idx)
709 static inline unsigned long
710 mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
711 int nid, unsigned int lru_mask)
716 static inline unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg)
722 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
726 static inline void lock_page_memcg(struct page *page)
730 static inline void unlock_page_memcg(struct page *page)
734 static inline void mem_cgroup_handle_over_high(void)
738 static inline void mem_cgroup_oom_enable(void)
742 static inline void mem_cgroup_oom_disable(void)
746 static inline bool task_in_memcg_oom(struct task_struct *p)
751 static inline bool mem_cgroup_oom_synchronize(bool wait)
756 static inline unsigned long mem_cgroup_read_stat(struct mem_cgroup *memcg,
757 enum mem_cgroup_stat_index idx)
762 static inline void mem_cgroup_update_stat(struct mem_cgroup *memcg,
763 enum mem_cgroup_stat_index idx, int val)
767 static inline void mem_cgroup_inc_stat(struct mem_cgroup *memcg,
768 enum mem_cgroup_stat_index idx)
772 static inline void mem_cgroup_dec_stat(struct mem_cgroup *memcg,
773 enum mem_cgroup_stat_index idx)
777 static inline void mem_cgroup_update_page_stat(struct page *page,
778 enum mem_cgroup_stat_index idx,
783 static inline void mem_cgroup_inc_page_stat(struct page *page,
784 enum mem_cgroup_stat_index idx)
788 static inline void mem_cgroup_dec_page_stat(struct page *page,
789 enum mem_cgroup_stat_index idx)
794 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
796 unsigned long *total_scanned)
801 static inline void mem_cgroup_split_huge_fixup(struct page *head)
806 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
809 #endif /* CONFIG_MEMCG */
811 #ifdef CONFIG_CGROUP_WRITEBACK
813 struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg);
814 struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
815 void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
816 unsigned long *pheadroom, unsigned long *pdirty,
817 unsigned long *pwriteback);
819 #else /* CONFIG_CGROUP_WRITEBACK */
821 static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb)
826 static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
827 unsigned long *pfilepages,
828 unsigned long *pheadroom,
829 unsigned long *pdirty,
830 unsigned long *pwriteback)
834 #endif /* CONFIG_CGROUP_WRITEBACK */
837 bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
838 void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
840 extern struct static_key_false memcg_sockets_enabled_key;
841 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
842 void mem_cgroup_sk_alloc(struct sock *sk);
843 void mem_cgroup_sk_free(struct sock *sk);
844 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
846 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure)
849 if (time_before(jiffies, memcg->socket_pressure))
851 } while ((memcg = parent_mem_cgroup(memcg)));
855 #define mem_cgroup_sockets_enabled 0
856 static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
857 static inline void mem_cgroup_sk_free(struct sock *sk) { };
858 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
864 struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep);
865 void memcg_kmem_put_cache(struct kmem_cache *cachep);
866 int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
867 struct mem_cgroup *memcg);
868 int memcg_kmem_charge(struct page *page, gfp_t gfp, int order);
869 void memcg_kmem_uncharge(struct page *page, int order);
871 #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
872 extern struct static_key_false memcg_kmem_enabled_key;
873 extern struct workqueue_struct *memcg_kmem_cache_wq;
875 extern int memcg_nr_cache_ids;
876 void memcg_get_cache_ids(void);
877 void memcg_put_cache_ids(void);
880 * Helper macro to loop through all memcg-specific caches. Callers must still
881 * check if the cache is valid (it is either valid or NULL).
882 * the slab_mutex must be held when looping through those caches
884 #define for_each_memcg_cache_index(_idx) \
885 for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++)
887 static inline bool memcg_kmem_enabled(void)
889 return static_branch_unlikely(&memcg_kmem_enabled_key);
893 * helper for accessing a memcg's index. It will be used as an index in the
894 * child cache array in kmem_cache, and also to derive its name. This function
895 * will return -1 when this is not a kmem-limited memcg.
897 static inline int memcg_cache_id(struct mem_cgroup *memcg)
899 return memcg ? memcg->kmemcg_id : -1;
903 * memcg_kmem_update_page_stat - update kmem page state statistics
905 * @idx: page state item to account
906 * @val: number of pages (positive or negative)
908 static inline void memcg_kmem_update_page_stat(struct page *page,
909 enum mem_cgroup_stat_index idx, int val)
911 if (memcg_kmem_enabled() && page->mem_cgroup)
912 this_cpu_add(page->mem_cgroup->stat->count[idx], val);
916 #define for_each_memcg_cache_index(_idx) \
919 static inline bool memcg_kmem_enabled(void)
924 static inline int memcg_cache_id(struct mem_cgroup *memcg)
929 static inline void memcg_get_cache_ids(void)
933 static inline void memcg_put_cache_ids(void)
937 static inline void memcg_kmem_update_page_stat(struct page *page,
938 enum mem_cgroup_stat_index idx, int val)
941 #endif /* CONFIG_MEMCG && !CONFIG_SLOB */
943 #endif /* _LINUX_MEMCONTROL_H */