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;
72 enum mem_cgroup_events_index {
73 MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */
74 MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */
75 MEM_CGROUP_EVENTS_PGFAULT, /* # of page-faults */
76 MEM_CGROUP_EVENTS_PGMAJFAULT, /* # of major page-faults */
77 MEM_CGROUP_EVENTS_NSTATS,
78 /* default hierarchy events */
79 MEMCG_LOW = MEM_CGROUP_EVENTS_NSTATS,
87 * Per memcg event counter is incremented at every pagein/pageout. With THP,
88 * it will be incremated by the number of pages. This counter is used for
89 * for trigger some periodic events. This is straightforward and better
90 * than using jiffies etc. to handle periodic memcg event.
92 enum mem_cgroup_events_target {
93 MEM_CGROUP_TARGET_THRESH,
94 MEM_CGROUP_TARGET_SOFTLIMIT,
95 MEM_CGROUP_TARGET_NUMAINFO,
101 #define MEM_CGROUP_ID_SHIFT 16
102 #define MEM_CGROUP_ID_MAX USHRT_MAX
104 struct mem_cgroup_id {
109 struct mem_cgroup_stat_cpu {
110 long count[MEMCG_NR_STAT];
111 unsigned long events[MEMCG_NR_EVENTS];
112 unsigned long nr_page_events;
113 unsigned long targets[MEM_CGROUP_NTARGETS];
116 struct mem_cgroup_reclaim_iter {
117 struct mem_cgroup *position;
118 /* scan generation, increased every round-trip */
119 unsigned int generation;
123 * per-zone information in memory controller.
125 struct mem_cgroup_per_node {
126 struct lruvec lruvec;
127 unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];
129 struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1];
131 struct rb_node tree_node; /* RB tree node */
132 unsigned long usage_in_excess;/* Set to the value by which */
133 /* the soft limit is exceeded*/
135 struct mem_cgroup *memcg; /* Back pointer, we cannot */
136 /* use container_of */
139 struct mem_cgroup_threshold {
140 struct eventfd_ctx *eventfd;
141 unsigned long threshold;
145 struct mem_cgroup_threshold_ary {
146 /* An array index points to threshold just below or equal to usage. */
147 int current_threshold;
148 /* Size of entries[] */
150 /* Array of thresholds */
151 struct mem_cgroup_threshold entries[0];
154 struct mem_cgroup_thresholds {
155 /* Primary thresholds array */
156 struct mem_cgroup_threshold_ary *primary;
158 * Spare threshold array.
159 * This is needed to make mem_cgroup_unregister_event() "never fail".
160 * It must be able to store at least primary->size - 1 entries.
162 struct mem_cgroup_threshold_ary *spare;
165 enum memcg_kmem_state {
172 * The memory controller data structure. The memory controller controls both
173 * page cache and RSS per cgroup. We would eventually like to provide
174 * statistics based on the statistics developed by Rik Van Riel for clock-pro,
175 * to help the administrator determine what knobs to tune.
178 struct cgroup_subsys_state css;
180 /* Private memcg ID. Used to ID objects that outlive the cgroup */
181 struct mem_cgroup_id id;
183 /* Accounted resources */
184 struct page_counter memory;
185 struct page_counter swap;
187 /* Legacy consumer-oriented counters */
188 struct page_counter memsw;
189 struct page_counter kmem;
190 struct page_counter tcpmem;
192 /* Normal memory consumption range */
196 /* Range enforcement for interrupt charges */
197 struct work_struct high_work;
199 unsigned long soft_limit;
201 /* vmpressure notifications */
202 struct vmpressure vmpressure;
205 * Should the accounting and control be hierarchical, per subtree?
209 /* protected by memcg_oom_lock */
214 /* OOM-Killer disable */
215 int oom_kill_disable;
217 /* handle for "memory.events" */
218 struct cgroup_file events_file;
220 /* protect arrays of thresholds */
221 struct mutex thresholds_lock;
223 /* thresholds for memory usage. RCU-protected */
224 struct mem_cgroup_thresholds thresholds;
226 /* thresholds for mem+swap usage. RCU-protected */
227 struct mem_cgroup_thresholds memsw_thresholds;
229 /* For oom notifier event fd */
230 struct list_head oom_notify;
233 * Should we move charges of a task when a task is moved into this
234 * mem_cgroup ? And what type of charges should we move ?
236 unsigned long move_charge_at_immigrate;
238 * set > 0 if pages under this cgroup are moving to other cgroup.
240 atomic_t moving_account;
241 /* taken only while moving_account > 0 */
242 spinlock_t move_lock;
243 struct task_struct *move_lock_task;
244 unsigned long move_lock_flags;
248 struct mem_cgroup_stat_cpu __percpu *stat;
250 unsigned long socket_pressure;
252 /* Legacy tcp memory accounting */
257 /* Index in the kmem_cache->memcg_params.memcg_caches array */
259 enum memcg_kmem_state kmem_state;
260 struct list_head kmem_caches;
263 int last_scanned_node;
265 nodemask_t scan_nodes;
266 atomic_t numainfo_events;
267 atomic_t numainfo_updating;
270 #ifdef CONFIG_CGROUP_WRITEBACK
271 struct list_head cgwb_list;
272 struct wb_domain cgwb_domain;
275 /* List of events which userspace want to receive */
276 struct list_head event_list;
277 spinlock_t event_list_lock;
279 struct mem_cgroup_per_node *nodeinfo[0];
280 /* WARNING: nodeinfo must be the last member here */
283 extern struct mem_cgroup *root_mem_cgroup;
285 static inline bool mem_cgroup_disabled(void)
287 return !cgroup_subsys_enabled(memory_cgrp_subsys);
290 static inline void mem_cgroup_event(struct mem_cgroup *memcg,
291 enum mem_cgroup_events_index idx)
293 this_cpu_inc(memcg->stat->events[idx]);
294 cgroup_file_notify(&memcg->events_file);
297 bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg);
299 int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
300 gfp_t gfp_mask, struct mem_cgroup **memcgp,
302 void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
303 bool lrucare, bool compound);
304 void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg,
306 void mem_cgroup_uncharge(struct page *page);
307 void mem_cgroup_uncharge_list(struct list_head *page_list);
309 void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
311 static struct mem_cgroup_per_node *
312 mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid)
314 return memcg->nodeinfo[nid];
318 * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone
319 * @node: node of the wanted lruvec
320 * @memcg: memcg of the wanted lruvec
322 * Returns the lru list vector holding pages for a given @node or a given
323 * @memcg and @zone. This can be the node lruvec, if the memory controller
326 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
327 struct mem_cgroup *memcg)
329 struct mem_cgroup_per_node *mz;
330 struct lruvec *lruvec;
332 if (mem_cgroup_disabled()) {
333 lruvec = node_lruvec(pgdat);
337 mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id);
338 lruvec = &mz->lruvec;
341 * Since a node can be onlined after the mem_cgroup was created,
342 * we have to be prepared to initialize lruvec->pgdat here;
343 * and if offlined then reonlined, we need to reinitialize it.
345 if (unlikely(lruvec->pgdat != pgdat))
346 lruvec->pgdat = pgdat;
350 struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
352 bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
353 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
356 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
357 return css ? container_of(css, struct mem_cgroup, css) : NULL;
360 #define mem_cgroup_from_counter(counter, member) \
361 container_of(counter, struct mem_cgroup, member)
363 struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
365 struct mem_cgroup_reclaim_cookie *);
366 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
367 int mem_cgroup_scan_tasks(struct mem_cgroup *,
368 int (*)(struct task_struct *, void *), void *);
370 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
372 if (mem_cgroup_disabled())
377 struct mem_cgroup *mem_cgroup_from_id(unsigned short id);
380 * parent_mem_cgroup - find the accounting parent of a memcg
381 * @memcg: memcg whose parent to find
383 * Returns the parent memcg, or NULL if this is the root or the memory
384 * controller is in legacy no-hierarchy mode.
386 static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
388 if (!memcg->memory.parent)
390 return mem_cgroup_from_counter(memcg->memory.parent, memory);
393 static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
394 struct mem_cgroup *root)
398 if (!root->use_hierarchy)
400 return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
403 static inline bool mm_match_cgroup(struct mm_struct *mm,
404 struct mem_cgroup *memcg)
406 struct mem_cgroup *task_memcg;
410 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
412 match = mem_cgroup_is_descendant(task_memcg, memcg);
417 struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page);
418 ino_t page_cgroup_ino(struct page *page);
420 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
422 if (mem_cgroup_disabled())
424 return !!(memcg->css.flags & CSS_ONLINE);
428 * For memory reclaim.
430 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
432 void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
433 int zid, int nr_pages);
435 unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
436 int nid, unsigned int lru_mask);
439 unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
441 struct mem_cgroup_per_node *mz;
442 unsigned long nr_pages = 0;
445 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
446 for (zid = 0; zid < MAX_NR_ZONES; zid++)
447 nr_pages += mz->lru_zone_size[zid][lru];
452 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
453 enum lru_list lru, int zone_idx)
455 struct mem_cgroup_per_node *mz;
457 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
458 return mz->lru_zone_size[zone_idx][lru];
461 void mem_cgroup_handle_over_high(void);
463 unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg);
465 void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
466 struct task_struct *p);
468 static inline void mem_cgroup_oom_enable(void)
470 WARN_ON(current->memcg_may_oom);
471 current->memcg_may_oom = 1;
474 static inline void mem_cgroup_oom_disable(void)
476 WARN_ON(!current->memcg_may_oom);
477 current->memcg_may_oom = 0;
480 static inline bool task_in_memcg_oom(struct task_struct *p)
482 return p->memcg_in_oom;
485 bool mem_cgroup_oom_synchronize(bool wait);
487 #ifdef CONFIG_MEMCG_SWAP
488 extern int do_swap_account;
491 void lock_page_memcg(struct page *page);
492 void unlock_page_memcg(struct page *page);
494 static inline unsigned long mem_cgroup_read_stat(struct mem_cgroup *memcg,
495 enum mem_cgroup_stat_index idx)
500 for_each_possible_cpu(cpu)
501 val += per_cpu(memcg->stat->count[idx], cpu);
509 static inline void mem_cgroup_update_stat(struct mem_cgroup *memcg,
510 enum mem_cgroup_stat_index idx, int val)
512 if (!mem_cgroup_disabled())
513 this_cpu_add(memcg->stat->count[idx], val);
516 static inline void mem_cgroup_inc_stat(struct mem_cgroup *memcg,
517 enum mem_cgroup_stat_index idx)
519 mem_cgroup_update_stat(memcg, idx, 1);
522 static inline void mem_cgroup_dec_stat(struct mem_cgroup *memcg,
523 enum mem_cgroup_stat_index idx)
525 mem_cgroup_update_stat(memcg, idx, -1);
529 * mem_cgroup_update_page_stat - update page state statistics
531 * @idx: page state item to account
532 * @val: number of pages (positive or negative)
534 * The @page must be locked or the caller must use lock_page_memcg()
535 * to prevent double accounting when the page is concurrently being
536 * moved to another memcg:
538 * lock_page(page) or lock_page_memcg(page)
539 * if (TestClearPageState(page))
540 * mem_cgroup_update_page_stat(page, state, -1);
541 * unlock_page(page) or unlock_page_memcg(page)
543 * Kernel pages are an exception to this, since they'll never move.
545 static inline void mem_cgroup_update_page_stat(struct page *page,
546 enum mem_cgroup_stat_index idx, int val)
548 if (page->mem_cgroup)
549 mem_cgroup_update_stat(page->mem_cgroup, idx, val);
552 static inline void mem_cgroup_inc_page_stat(struct page *page,
553 enum mem_cgroup_stat_index idx)
555 mem_cgroup_update_page_stat(page, idx, 1);
558 static inline void mem_cgroup_dec_page_stat(struct page *page,
559 enum mem_cgroup_stat_index idx)
561 mem_cgroup_update_page_stat(page, idx, -1);
564 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
566 unsigned long *total_scanned);
568 static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
569 enum vm_event_item idx)
571 struct mem_cgroup *memcg;
573 if (mem_cgroup_disabled())
577 memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
578 if (unlikely(!memcg))
583 this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]);
586 this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]);
594 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
595 void mem_cgroup_split_huge_fixup(struct page *head);
598 #else /* CONFIG_MEMCG */
600 #define MEM_CGROUP_ID_SHIFT 0
601 #define MEM_CGROUP_ID_MAX 0
605 static inline bool mem_cgroup_disabled(void)
610 static inline void mem_cgroup_event(struct mem_cgroup *memcg,
611 enum mem_cgroup_events_index idx)
615 static inline bool mem_cgroup_low(struct mem_cgroup *root,
616 struct mem_cgroup *memcg)
621 static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
623 struct mem_cgroup **memcgp,
630 static inline void mem_cgroup_commit_charge(struct page *page,
631 struct mem_cgroup *memcg,
632 bool lrucare, bool compound)
636 static inline void mem_cgroup_cancel_charge(struct page *page,
637 struct mem_cgroup *memcg,
642 static inline void mem_cgroup_uncharge(struct page *page)
646 static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
650 static inline void mem_cgroup_migrate(struct page *old, struct page *new)
654 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
655 struct mem_cgroup *memcg)
657 return node_lruvec(pgdat);
660 static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
661 struct pglist_data *pgdat)
663 return &pgdat->lruvec;
666 static inline bool mm_match_cgroup(struct mm_struct *mm,
667 struct mem_cgroup *memcg)
672 static inline bool task_in_mem_cgroup(struct task_struct *task,
673 const struct mem_cgroup *memcg)
678 static inline struct mem_cgroup *
679 mem_cgroup_iter(struct mem_cgroup *root,
680 struct mem_cgroup *prev,
681 struct mem_cgroup_reclaim_cookie *reclaim)
686 static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
687 struct mem_cgroup *prev)
691 static inline int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
692 int (*fn)(struct task_struct *, void *), void *arg)
697 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
702 static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
705 /* XXX: This should always return root_mem_cgroup */
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 mem_cgroup_read_stat(struct mem_cgroup *memcg,
774 enum mem_cgroup_stat_index idx)
779 static inline void mem_cgroup_update_stat(struct mem_cgroup *memcg,
780 enum mem_cgroup_stat_index idx, int val)
784 static inline void mem_cgroup_inc_stat(struct mem_cgroup *memcg,
785 enum mem_cgroup_stat_index idx)
789 static inline void mem_cgroup_dec_stat(struct mem_cgroup *memcg,
790 enum mem_cgroup_stat_index idx)
794 static inline void mem_cgroup_update_page_stat(struct page *page,
795 enum mem_cgroup_stat_index idx,
800 static inline void mem_cgroup_inc_page_stat(struct page *page,
801 enum mem_cgroup_stat_index idx)
805 static inline void mem_cgroup_dec_page_stat(struct page *page,
806 enum mem_cgroup_stat_index idx)
811 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
813 unsigned long *total_scanned)
818 static inline void mem_cgroup_split_huge_fixup(struct page *head)
823 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
826 #endif /* CONFIG_MEMCG */
828 #ifdef CONFIG_CGROUP_WRITEBACK
830 struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg);
831 struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
832 void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
833 unsigned long *pheadroom, unsigned long *pdirty,
834 unsigned long *pwriteback);
836 #else /* CONFIG_CGROUP_WRITEBACK */
838 static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb)
843 static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
844 unsigned long *pfilepages,
845 unsigned long *pheadroom,
846 unsigned long *pdirty,
847 unsigned long *pwriteback)
851 #endif /* CONFIG_CGROUP_WRITEBACK */
854 bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
855 void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
857 extern struct static_key_false memcg_sockets_enabled_key;
858 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
859 void mem_cgroup_sk_alloc(struct sock *sk);
860 void mem_cgroup_sk_free(struct sock *sk);
861 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
863 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure)
866 if (time_before(jiffies, memcg->socket_pressure))
868 } while ((memcg = parent_mem_cgroup(memcg)));
872 #define mem_cgroup_sockets_enabled 0
873 static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
874 static inline void mem_cgroup_sk_free(struct sock *sk) { };
875 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
881 struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep);
882 void memcg_kmem_put_cache(struct kmem_cache *cachep);
883 int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
884 struct mem_cgroup *memcg);
885 int memcg_kmem_charge(struct page *page, gfp_t gfp, int order);
886 void memcg_kmem_uncharge(struct page *page, int order);
888 #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
889 extern struct static_key_false memcg_kmem_enabled_key;
890 extern struct workqueue_struct *memcg_kmem_cache_wq;
892 extern int memcg_nr_cache_ids;
893 void memcg_get_cache_ids(void);
894 void memcg_put_cache_ids(void);
897 * Helper macro to loop through all memcg-specific caches. Callers must still
898 * check if the cache is valid (it is either valid or NULL).
899 * the slab_mutex must be held when looping through those caches
901 #define for_each_memcg_cache_index(_idx) \
902 for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++)
904 static inline bool memcg_kmem_enabled(void)
906 return static_branch_unlikely(&memcg_kmem_enabled_key);
910 * helper for accessing a memcg's index. It will be used as an index in the
911 * child cache array in kmem_cache, and also to derive its name. This function
912 * will return -1 when this is not a kmem-limited memcg.
914 static inline int memcg_cache_id(struct mem_cgroup *memcg)
916 return memcg ? memcg->kmemcg_id : -1;
920 * memcg_kmem_update_page_stat - update kmem page state statistics
922 * @idx: page state item to account
923 * @val: number of pages (positive or negative)
925 static inline void memcg_kmem_update_page_stat(struct page *page,
926 enum mem_cgroup_stat_index idx, int val)
928 if (memcg_kmem_enabled() && page->mem_cgroup)
929 this_cpu_add(page->mem_cgroup->stat->count[idx], val);
933 #define for_each_memcg_cache_index(_idx) \
936 static inline bool memcg_kmem_enabled(void)
941 static inline int memcg_cache_id(struct mem_cgroup *memcg)
946 static inline void memcg_get_cache_ids(void)
950 static inline void memcg_put_cache_ids(void)
954 static inline void memcg_kmem_update_page_stat(struct page *page,
955 enum mem_cgroup_stat_index idx, int val)
958 #endif /* CONFIG_MEMCG && !CONFIG_SLOB */
960 #endif /* _LINUX_MEMCONTROL_H */