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
);
361 * parent_mem_cgroup - find the accounting parent of a memcg
362 * @memcg: memcg whose parent to find
364 * Returns the parent memcg, or NULL if this is the root or the memory
365 * controller is in legacy no-hierarchy mode.
367 static inline struct mem_cgroup
*parent_mem_cgroup(struct mem_cgroup
*memcg
)
369 if (!memcg
->memory
.parent
)
371 return mem_cgroup_from_counter(memcg
->memory
.parent
, memory
);
374 static inline bool mem_cgroup_is_descendant(struct mem_cgroup
*memcg
,
375 struct mem_cgroup
*root
)
379 if (!root
->use_hierarchy
)
381 return cgroup_is_descendant(memcg
->css
.cgroup
, root
->css
.cgroup
);
384 static inline bool mm_match_cgroup(struct mm_struct
*mm
,
385 struct mem_cgroup
*memcg
)
387 struct mem_cgroup
*task_memcg
;
391 task_memcg
= mem_cgroup_from_task(rcu_dereference(mm
->owner
));
393 match
= mem_cgroup_is_descendant(task_memcg
, memcg
);
398 struct cgroup_subsys_state
*mem_cgroup_css_from_page(struct page
*page
);
399 ino_t
page_cgroup_ino(struct page
*page
);
401 static inline bool mem_cgroup_online(struct mem_cgroup
*memcg
)
403 if (mem_cgroup_disabled())
405 return !!(memcg
->css
.flags
& CSS_ONLINE
);
409 * For memory reclaim.
411 int mem_cgroup_select_victim_node(struct mem_cgroup
*memcg
);
413 void mem_cgroup_update_lru_size(struct lruvec
*lruvec
, enum lru_list lru
,
414 int zid
, int nr_pages
);
416 unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup
*memcg
,
417 int nid
, unsigned int lru_mask
);
420 unsigned long mem_cgroup_get_lru_size(struct lruvec
*lruvec
, enum lru_list lru
)
422 struct mem_cgroup_per_node
*mz
;
423 unsigned long nr_pages
= 0;
426 mz
= container_of(lruvec
, struct mem_cgroup_per_node
, lruvec
);
427 for (zid
= 0; zid
< MAX_NR_ZONES
; zid
++)
428 nr_pages
+= mz
->lru_zone_size
[zid
][lru
];
433 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec
*lruvec
,
434 enum lru_list lru
, int zone_idx
)
436 struct mem_cgroup_per_node
*mz
;
438 mz
= container_of(lruvec
, struct mem_cgroup_per_node
, lruvec
);
439 return mz
->lru_zone_size
[zone_idx
][lru
];
442 void mem_cgroup_handle_over_high(void);
444 unsigned long mem_cgroup_get_limit(struct mem_cgroup
*memcg
);
446 void mem_cgroup_print_oom_info(struct mem_cgroup
*memcg
,
447 struct task_struct
*p
);
449 static inline void mem_cgroup_oom_enable(void)
451 WARN_ON(current
->memcg_may_oom
);
452 current
->memcg_may_oom
= 1;
455 static inline void mem_cgroup_oom_disable(void)
457 WARN_ON(!current
->memcg_may_oom
);
458 current
->memcg_may_oom
= 0;
461 static inline bool task_in_memcg_oom(struct task_struct
*p
)
463 return p
->memcg_in_oom
;
466 bool mem_cgroup_oom_synchronize(bool wait
);
468 #ifdef CONFIG_MEMCG_SWAP
469 extern int do_swap_account
;
472 void lock_page_memcg(struct page
*page
);
473 void unlock_page_memcg(struct page
*page
);
475 static inline unsigned long memcg_page_state(struct mem_cgroup
*memcg
,
476 enum memcg_stat_item idx
)
481 for_each_possible_cpu(cpu
)
482 val
+= per_cpu(memcg
->stat
->count
[idx
], cpu
);
490 static inline void mod_memcg_state(struct mem_cgroup
*memcg
,
491 enum memcg_stat_item idx
, int val
)
493 if (!mem_cgroup_disabled())
494 this_cpu_add(memcg
->stat
->count
[idx
], val
);
497 static inline void inc_memcg_state(struct mem_cgroup
*memcg
,
498 enum memcg_stat_item idx
)
500 mod_memcg_state(memcg
, idx
, 1);
503 static inline void dec_memcg_state(struct mem_cgroup
*memcg
,
504 enum memcg_stat_item idx
)
506 mod_memcg_state(memcg
, idx
, -1);
510 * mod_memcg_page_state - update page state statistics
512 * @idx: page state item to account
513 * @val: number of pages (positive or negative)
515 * The @page must be locked or the caller must use lock_page_memcg()
516 * to prevent double accounting when the page is concurrently being
517 * moved to another memcg:
519 * lock_page(page) or lock_page_memcg(page)
520 * if (TestClearPageState(page))
521 * mod_memcg_page_state(page, state, -1);
522 * unlock_page(page) or unlock_page_memcg(page)
524 * Kernel pages are an exception to this, since they'll never move.
526 static inline void mod_memcg_page_state(struct page
*page
,
527 enum memcg_stat_item idx
, int val
)
529 if (page
->mem_cgroup
)
530 mod_memcg_state(page
->mem_cgroup
, idx
, val
);
533 static inline void inc_memcg_page_state(struct page
*page
,
534 enum memcg_stat_item idx
)
536 mod_memcg_page_state(page
, idx
, 1);
539 static inline void dec_memcg_page_state(struct page
*page
,
540 enum memcg_stat_item idx
)
542 mod_memcg_page_state(page
, idx
, -1);
545 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t
*pgdat
, int order
,
547 unsigned long *total_scanned
);
549 static inline void mem_cgroup_count_vm_event(struct mm_struct
*mm
,
550 enum vm_event_item idx
)
552 struct mem_cgroup
*memcg
;
554 if (mem_cgroup_disabled())
558 memcg
= mem_cgroup_from_task(rcu_dereference(mm
->owner
));
560 this_cpu_inc(memcg
->stat
->events
[idx
]);
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_event(struct mem_cgroup
*memcg
,
580 enum memcg_event_item event
)
584 static inline bool mem_cgroup_low(struct mem_cgroup
*root
,
585 struct mem_cgroup
*memcg
)
590 static inline int mem_cgroup_try_charge(struct page
*page
, struct mm_struct
*mm
,
592 struct mem_cgroup
**memcgp
,
599 static inline void mem_cgroup_commit_charge(struct page
*page
,
600 struct mem_cgroup
*memcg
,
601 bool lrucare
, bool compound
)
605 static inline void mem_cgroup_cancel_charge(struct page
*page
,
606 struct mem_cgroup
*memcg
,
611 static inline void mem_cgroup_uncharge(struct page
*page
)
615 static inline void mem_cgroup_uncharge_list(struct list_head
*page_list
)
619 static inline void mem_cgroup_migrate(struct page
*old
, struct page
*new)
623 static inline struct lruvec
*mem_cgroup_lruvec(struct pglist_data
*pgdat
,
624 struct mem_cgroup
*memcg
)
626 return node_lruvec(pgdat
);
629 static inline struct lruvec
*mem_cgroup_page_lruvec(struct page
*page
,
630 struct pglist_data
*pgdat
)
632 return &pgdat
->lruvec
;
635 static inline bool mm_match_cgroup(struct mm_struct
*mm
,
636 struct mem_cgroup
*memcg
)
641 static inline bool task_in_mem_cgroup(struct task_struct
*task
,
642 const struct mem_cgroup
*memcg
)
647 static inline struct mem_cgroup
*
648 mem_cgroup_iter(struct mem_cgroup
*root
,
649 struct mem_cgroup
*prev
,
650 struct mem_cgroup_reclaim_cookie
*reclaim
)
655 static inline void mem_cgroup_iter_break(struct mem_cgroup
*root
,
656 struct mem_cgroup
*prev
)
660 static inline int mem_cgroup_scan_tasks(struct mem_cgroup
*memcg
,
661 int (*fn
)(struct task_struct
*, void *), void *arg
)
666 static inline unsigned short mem_cgroup_id(struct mem_cgroup
*memcg
)
671 static inline struct mem_cgroup
*mem_cgroup_from_id(unsigned short id
)
674 /* XXX: This should always return root_mem_cgroup */
678 static inline bool mem_cgroup_online(struct mem_cgroup
*memcg
)
683 static inline unsigned long
684 mem_cgroup_get_lru_size(struct lruvec
*lruvec
, enum lru_list lru
)
689 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec
*lruvec
,
690 enum lru_list lru
, int zone_idx
)
695 static inline unsigned long
696 mem_cgroup_node_nr_lru_pages(struct mem_cgroup
*memcg
,
697 int nid
, unsigned int lru_mask
)
702 static inline unsigned long mem_cgroup_get_limit(struct mem_cgroup
*memcg
)
708 mem_cgroup_print_oom_info(struct mem_cgroup
*memcg
, struct task_struct
*p
)
712 static inline void lock_page_memcg(struct page
*page
)
716 static inline void unlock_page_memcg(struct page
*page
)
720 static inline void mem_cgroup_handle_over_high(void)
724 static inline void mem_cgroup_oom_enable(void)
728 static inline void mem_cgroup_oom_disable(void)
732 static inline bool task_in_memcg_oom(struct task_struct
*p
)
737 static inline bool mem_cgroup_oom_synchronize(bool wait
)
742 static inline unsigned long memcg_page_state(struct mem_cgroup
*memcg
,
743 enum memcg_stat_item idx
)
748 static inline void mod_memcg_state(struct mem_cgroup
*memcg
,
749 enum memcg_stat_item idx
,
754 static inline void inc_memcg_state(struct mem_cgroup
*memcg
,
755 enum memcg_stat_item idx
)
759 static inline void dec_memcg_state(struct mem_cgroup
*memcg
,
760 enum memcg_stat_item idx
)
764 static inline void mod_memcg_page_state(struct page
*page
,
765 enum memcg_stat_item idx
,
770 static inline void inc_memcg_page_state(struct page
*page
,
771 enum memcg_stat_item idx
)
775 static inline void dec_memcg_page_state(struct page
*page
,
776 enum memcg_stat_item idx
)
781 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t
*pgdat
, int order
,
783 unsigned long *total_scanned
)
788 static inline void mem_cgroup_split_huge_fixup(struct page
*head
)
793 void mem_cgroup_count_vm_event(struct mm_struct
*mm
, enum vm_event_item idx
)
796 #endif /* CONFIG_MEMCG */
798 #ifdef CONFIG_CGROUP_WRITEBACK
800 struct list_head
*mem_cgroup_cgwb_list(struct mem_cgroup
*memcg
);
801 struct wb_domain
*mem_cgroup_wb_domain(struct bdi_writeback
*wb
);
802 void mem_cgroup_wb_stats(struct bdi_writeback
*wb
, unsigned long *pfilepages
,
803 unsigned long *pheadroom
, unsigned long *pdirty
,
804 unsigned long *pwriteback
);
806 #else /* CONFIG_CGROUP_WRITEBACK */
808 static inline struct wb_domain
*mem_cgroup_wb_domain(struct bdi_writeback
*wb
)
813 static inline void mem_cgroup_wb_stats(struct bdi_writeback
*wb
,
814 unsigned long *pfilepages
,
815 unsigned long *pheadroom
,
816 unsigned long *pdirty
,
817 unsigned long *pwriteback
)
821 #endif /* CONFIG_CGROUP_WRITEBACK */
824 bool mem_cgroup_charge_skmem(struct mem_cgroup
*memcg
, unsigned int nr_pages
);
825 void mem_cgroup_uncharge_skmem(struct mem_cgroup
*memcg
, unsigned int nr_pages
);
827 extern struct static_key_false memcg_sockets_enabled_key
;
828 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
829 void mem_cgroup_sk_alloc(struct sock
*sk
);
830 void mem_cgroup_sk_free(struct sock
*sk
);
831 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup
*memcg
)
833 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys
) && memcg
->tcpmem_pressure
)
836 if (time_before(jiffies
, memcg
->socket_pressure
))
838 } while ((memcg
= parent_mem_cgroup(memcg
)));
842 #define mem_cgroup_sockets_enabled 0
843 static inline void mem_cgroup_sk_alloc(struct sock
*sk
) { };
844 static inline void mem_cgroup_sk_free(struct sock
*sk
) { };
845 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup
*memcg
)
851 struct kmem_cache
*memcg_kmem_get_cache(struct kmem_cache
*cachep
);
852 void memcg_kmem_put_cache(struct kmem_cache
*cachep
);
853 int memcg_kmem_charge_memcg(struct page
*page
, gfp_t gfp
, int order
,
854 struct mem_cgroup
*memcg
);
855 int memcg_kmem_charge(struct page
*page
, gfp_t gfp
, int order
);
856 void memcg_kmem_uncharge(struct page
*page
, int order
);
858 #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
859 extern struct static_key_false memcg_kmem_enabled_key
;
860 extern struct workqueue_struct
*memcg_kmem_cache_wq
;
862 extern int memcg_nr_cache_ids
;
863 void memcg_get_cache_ids(void);
864 void memcg_put_cache_ids(void);
867 * Helper macro to loop through all memcg-specific caches. Callers must still
868 * check if the cache is valid (it is either valid or NULL).
869 * the slab_mutex must be held when looping through those caches
871 #define for_each_memcg_cache_index(_idx) \
872 for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++)
874 static inline bool memcg_kmem_enabled(void)
876 return static_branch_unlikely(&memcg_kmem_enabled_key
);
880 * helper for accessing a memcg's index. It will be used as an index in the
881 * child cache array in kmem_cache, and also to derive its name. This function
882 * will return -1 when this is not a kmem-limited memcg.
884 static inline int memcg_cache_id(struct mem_cgroup
*memcg
)
886 return memcg
? memcg
->kmemcg_id
: -1;
890 * memcg_kmem_update_page_stat - update kmem page state statistics
892 * @idx: page state item to account
893 * @val: number of pages (positive or negative)
895 static inline void memcg_kmem_update_page_stat(struct page
*page
,
896 enum memcg_stat_item idx
, int val
)
898 if (memcg_kmem_enabled() && page
->mem_cgroup
)
899 this_cpu_add(page
->mem_cgroup
->stat
->count
[idx
], val
);
903 #define for_each_memcg_cache_index(_idx) \
906 static inline bool memcg_kmem_enabled(void)
911 static inline int memcg_cache_id(struct mem_cgroup
*memcg
)
916 static inline void memcg_get_cache_ids(void)
920 static inline void memcg_put_cache_ids(void)
924 static inline void memcg_kmem_update_page_stat(struct page
*page
,
925 enum memcg_stat_item idx
, int val
)
928 #endif /* CONFIG_MEMCG && !CONFIG_SLOB */
930 #endif /* _LINUX_MEMCONTROL_H */