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>
33 * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c,
34 * These two lists should keep in accord with each other.
36 enum mem_cgroup_stat_index
{
38 * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
40 MEM_CGROUP_STAT_CACHE
, /* # of pages charged as cache */
41 MEM_CGROUP_STAT_RSS
, /* # of pages charged as anon rss */
42 MEM_CGROUP_STAT_RSS_HUGE
, /* # of pages charged as anon huge */
43 MEM_CGROUP_STAT_FILE_MAPPED
, /* # of pages charged as file rss */
44 MEM_CGROUP_STAT_WRITEBACK
, /* # of pages under writeback */
45 MEM_CGROUP_STAT_SWAP
, /* # of pages, swapped out */
46 MEM_CGROUP_STAT_NSTATS
,
49 struct mem_cgroup_reclaim_cookie
{
52 unsigned int generation
;
56 int mem_cgroup_try_charge(struct page
*page
, struct mm_struct
*mm
,
57 gfp_t gfp_mask
, struct mem_cgroup
**memcgp
);
58 void mem_cgroup_commit_charge(struct page
*page
, struct mem_cgroup
*memcg
,
60 void mem_cgroup_cancel_charge(struct page
*page
, struct mem_cgroup
*memcg
);
61 void mem_cgroup_uncharge(struct page
*page
);
62 void mem_cgroup_uncharge_list(struct list_head
*page_list
);
64 void mem_cgroup_migrate(struct page
*oldpage
, struct page
*newpage
,
67 struct lruvec
*mem_cgroup_zone_lruvec(struct zone
*, struct mem_cgroup
*);
68 struct lruvec
*mem_cgroup_page_lruvec(struct page
*, struct zone
*);
70 bool mem_cgroup_is_descendant(struct mem_cgroup
*memcg
,
71 struct mem_cgroup
*root
);
72 bool task_in_mem_cgroup(struct task_struct
*task
, struct mem_cgroup
*memcg
);
74 extern struct mem_cgroup
*try_get_mem_cgroup_from_page(struct page
*page
);
75 extern struct mem_cgroup
*mem_cgroup_from_task(struct task_struct
*p
);
77 extern struct mem_cgroup
*parent_mem_cgroup(struct mem_cgroup
*memcg
);
78 extern struct mem_cgroup
*mem_cgroup_from_css(struct cgroup_subsys_state
*css
);
80 static inline bool mm_match_cgroup(struct mm_struct
*mm
,
81 struct mem_cgroup
*memcg
)
83 struct mem_cgroup
*task_memcg
;
87 task_memcg
= mem_cgroup_from_task(rcu_dereference(mm
->owner
));
89 match
= mem_cgroup_is_descendant(task_memcg
, memcg
);
94 extern struct cgroup_subsys_state
*mem_cgroup_css(struct mem_cgroup
*memcg
);
96 struct mem_cgroup
*mem_cgroup_iter(struct mem_cgroup
*,
98 struct mem_cgroup_reclaim_cookie
*);
99 void mem_cgroup_iter_break(struct mem_cgroup
*, struct mem_cgroup
*);
102 * For memory reclaim.
104 int mem_cgroup_inactive_anon_is_low(struct lruvec
*lruvec
);
105 int mem_cgroup_select_victim_node(struct mem_cgroup
*memcg
);
106 unsigned long mem_cgroup_get_lru_size(struct lruvec
*lruvec
, enum lru_list
);
107 void mem_cgroup_update_lru_size(struct lruvec
*, enum lru_list
, int);
108 extern void mem_cgroup_print_oom_info(struct mem_cgroup
*memcg
,
109 struct task_struct
*p
);
111 static inline void mem_cgroup_oom_enable(void)
113 WARN_ON(current
->memcg_oom
.may_oom
);
114 current
->memcg_oom
.may_oom
= 1;
117 static inline void mem_cgroup_oom_disable(void)
119 WARN_ON(!current
->memcg_oom
.may_oom
);
120 current
->memcg_oom
.may_oom
= 0;
123 static inline bool task_in_memcg_oom(struct task_struct
*p
)
125 return p
->memcg_oom
.memcg
;
128 bool mem_cgroup_oom_synchronize(bool wait
);
130 #ifdef CONFIG_MEMCG_SWAP
131 extern int do_swap_account
;
134 static inline bool mem_cgroup_disabled(void)
136 if (memory_cgrp_subsys
.disabled
)
141 struct mem_cgroup
*mem_cgroup_begin_page_stat(struct page
*page
, bool *locked
,
142 unsigned long *flags
);
143 void mem_cgroup_end_page_stat(struct mem_cgroup
*memcg
, bool *locked
,
144 unsigned long *flags
);
145 void mem_cgroup_update_page_stat(struct mem_cgroup
*memcg
,
146 enum mem_cgroup_stat_index idx
, int val
);
148 static inline void mem_cgroup_inc_page_stat(struct mem_cgroup
*memcg
,
149 enum mem_cgroup_stat_index idx
)
151 mem_cgroup_update_page_stat(memcg
, idx
, 1);
154 static inline void mem_cgroup_dec_page_stat(struct mem_cgroup
*memcg
,
155 enum mem_cgroup_stat_index idx
)
157 mem_cgroup_update_page_stat(memcg
, idx
, -1);
160 unsigned long mem_cgroup_soft_limit_reclaim(struct zone
*zone
, int order
,
162 unsigned long *total_scanned
);
164 void __mem_cgroup_count_vm_event(struct mm_struct
*mm
, enum vm_event_item idx
);
165 static inline void mem_cgroup_count_vm_event(struct mm_struct
*mm
,
166 enum vm_event_item idx
)
168 if (mem_cgroup_disabled())
170 __mem_cgroup_count_vm_event(mm
, idx
);
172 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
173 void mem_cgroup_split_huge_fixup(struct page
*head
);
176 #else /* CONFIG_MEMCG */
179 static inline int mem_cgroup_try_charge(struct page
*page
, struct mm_struct
*mm
,
181 struct mem_cgroup
**memcgp
)
187 static inline void mem_cgroup_commit_charge(struct page
*page
,
188 struct mem_cgroup
*memcg
,
193 static inline void mem_cgroup_cancel_charge(struct page
*page
,
194 struct mem_cgroup
*memcg
)
198 static inline void mem_cgroup_uncharge(struct page
*page
)
202 static inline void mem_cgroup_uncharge_list(struct list_head
*page_list
)
206 static inline void mem_cgroup_migrate(struct page
*oldpage
,
207 struct page
*newpage
,
212 static inline struct lruvec
*mem_cgroup_zone_lruvec(struct zone
*zone
,
213 struct mem_cgroup
*memcg
)
215 return &zone
->lruvec
;
218 static inline struct lruvec
*mem_cgroup_page_lruvec(struct page
*page
,
221 return &zone
->lruvec
;
224 static inline struct mem_cgroup
*try_get_mem_cgroup_from_page(struct page
*page
)
229 static inline bool mm_match_cgroup(struct mm_struct
*mm
,
230 struct mem_cgroup
*memcg
)
235 static inline bool task_in_mem_cgroup(struct task_struct
*task
,
236 const struct mem_cgroup
*memcg
)
241 static inline struct cgroup_subsys_state
242 *mem_cgroup_css(struct mem_cgroup
*memcg
)
247 static inline struct mem_cgroup
*
248 mem_cgroup_iter(struct mem_cgroup
*root
,
249 struct mem_cgroup
*prev
,
250 struct mem_cgroup_reclaim_cookie
*reclaim
)
255 static inline void mem_cgroup_iter_break(struct mem_cgroup
*root
,
256 struct mem_cgroup
*prev
)
260 static inline bool mem_cgroup_disabled(void)
266 mem_cgroup_inactive_anon_is_low(struct lruvec
*lruvec
)
271 static inline unsigned long
272 mem_cgroup_get_lru_size(struct lruvec
*lruvec
, enum lru_list lru
)
278 mem_cgroup_update_lru_size(struct lruvec
*lruvec
, enum lru_list lru
,
284 mem_cgroup_print_oom_info(struct mem_cgroup
*memcg
, struct task_struct
*p
)
288 static inline struct mem_cgroup
*mem_cgroup_begin_page_stat(struct page
*page
,
289 bool *locked
, unsigned long *flags
)
294 static inline void mem_cgroup_end_page_stat(struct mem_cgroup
*memcg
,
295 bool *locked
, unsigned long *flags
)
299 static inline void mem_cgroup_oom_enable(void)
303 static inline void mem_cgroup_oom_disable(void)
307 static inline bool task_in_memcg_oom(struct task_struct
*p
)
312 static inline bool mem_cgroup_oom_synchronize(bool wait
)
317 static inline void mem_cgroup_inc_page_stat(struct mem_cgroup
*memcg
,
318 enum mem_cgroup_stat_index idx
)
322 static inline void mem_cgroup_dec_page_stat(struct mem_cgroup
*memcg
,
323 enum mem_cgroup_stat_index idx
)
328 unsigned long mem_cgroup_soft_limit_reclaim(struct zone
*zone
, int order
,
330 unsigned long *total_scanned
)
335 static inline void mem_cgroup_split_huge_fixup(struct page
*head
)
340 void mem_cgroup_count_vm_event(struct mm_struct
*mm
, enum vm_event_item idx
)
343 #endif /* CONFIG_MEMCG */
352 #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
353 void sock_update_memcg(struct sock
*sk
);
354 void sock_release_memcg(struct sock
*sk
);
356 static inline void sock_update_memcg(struct sock
*sk
)
359 static inline void sock_release_memcg(struct sock
*sk
)
362 #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */
364 #ifdef CONFIG_MEMCG_KMEM
365 extern struct static_key memcg_kmem_enabled_key
;
367 extern int memcg_limited_groups_array_size
;
370 * Helper macro to loop through all memcg-specific caches. Callers must still
371 * check if the cache is valid (it is either valid or NULL).
372 * the slab_mutex must be held when looping through those caches
374 #define for_each_memcg_cache_index(_idx) \
375 for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++)
377 static inline bool memcg_kmem_enabled(void)
379 return static_key_false(&memcg_kmem_enabled_key
);
383 * In general, we'll do everything in our power to not incur in any overhead
384 * for non-memcg users for the kmem functions. Not even a function call, if we
387 * Therefore, we'll inline all those functions so that in the best case, we'll
388 * see that kmemcg is off for everybody and proceed quickly. If it is on,
389 * we'll still do most of the flag checking inline. We check a lot of
390 * conditions, but because they are pretty simple, they are expected to be
393 bool __memcg_kmem_newpage_charge(gfp_t gfp
, struct mem_cgroup
**memcg
,
395 void __memcg_kmem_commit_charge(struct page
*page
,
396 struct mem_cgroup
*memcg
, int order
);
397 void __memcg_kmem_uncharge_pages(struct page
*page
, int order
);
399 int memcg_cache_id(struct mem_cgroup
*memcg
);
401 void memcg_update_array_size(int num_groups
);
403 struct kmem_cache
*__memcg_kmem_get_cache(struct kmem_cache
*cachep
);
404 void __memcg_kmem_put_cache(struct kmem_cache
*cachep
);
406 int __memcg_charge_slab(struct kmem_cache
*cachep
, gfp_t gfp
, int order
);
407 void __memcg_uncharge_slab(struct kmem_cache
*cachep
, int order
);
409 int __memcg_cleanup_cache_params(struct kmem_cache
*s
);
412 * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
413 * @gfp: the gfp allocation flags.
414 * @memcg: a pointer to the memcg this was charged against.
415 * @order: allocation order.
417 * returns true if the memcg where the current task belongs can hold this
420 * We return true automatically if this allocation is not to be accounted to
424 memcg_kmem_newpage_charge(gfp_t gfp
, struct mem_cgroup
**memcg
, int order
)
426 if (!memcg_kmem_enabled())
430 * __GFP_NOFAIL allocations will move on even if charging is not
431 * possible. Therefore we don't even try, and have this allocation
432 * unaccounted. We could in theory charge it forcibly, but we hope
433 * those allocations are rare, and won't be worth the trouble.
435 if (gfp
& __GFP_NOFAIL
)
437 if (in_interrupt() || (!current
->mm
) || (current
->flags
& PF_KTHREAD
))
440 /* If the test is dying, just let it go. */
441 if (unlikely(fatal_signal_pending(current
)))
444 return __memcg_kmem_newpage_charge(gfp
, memcg
, order
);
448 * memcg_kmem_uncharge_pages: uncharge pages from memcg
449 * @page: pointer to struct page being freed
450 * @order: allocation order.
453 memcg_kmem_uncharge_pages(struct page
*page
, int order
)
455 if (memcg_kmem_enabled())
456 __memcg_kmem_uncharge_pages(page
, order
);
460 * memcg_kmem_commit_charge: embeds correct memcg in a page
461 * @page: pointer to struct page recently allocated
462 * @memcg: the memcg structure we charged against
463 * @order: allocation order.
465 * Needs to be called after memcg_kmem_newpage_charge, regardless of success or
466 * failure of the allocation. if @page is NULL, this function will revert the
467 * charges. Otherwise, it will commit @page to @memcg.
470 memcg_kmem_commit_charge(struct page
*page
, struct mem_cgroup
*memcg
, int order
)
472 if (memcg_kmem_enabled() && memcg
)
473 __memcg_kmem_commit_charge(page
, memcg
, order
);
477 * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation
478 * @cachep: the original global kmem cache
479 * @gfp: allocation flags.
481 * All memory allocated from a per-memcg cache is charged to the owner memcg.
483 static __always_inline
struct kmem_cache
*
484 memcg_kmem_get_cache(struct kmem_cache
*cachep
, gfp_t gfp
)
486 if (!memcg_kmem_enabled())
488 if (gfp
& __GFP_NOFAIL
)
490 if (in_interrupt() || (!current
->mm
) || (current
->flags
& PF_KTHREAD
))
492 if (unlikely(fatal_signal_pending(current
)))
495 return __memcg_kmem_get_cache(cachep
);
498 static __always_inline
void memcg_kmem_put_cache(struct kmem_cache
*cachep
)
500 if (memcg_kmem_enabled())
501 __memcg_kmem_put_cache(cachep
);
504 #define for_each_memcg_cache_index(_idx) \
507 static inline bool memcg_kmem_enabled(void)
513 memcg_kmem_newpage_charge(gfp_t gfp
, struct mem_cgroup
**memcg
, int order
)
518 static inline void memcg_kmem_uncharge_pages(struct page
*page
, int order
)
523 memcg_kmem_commit_charge(struct page
*page
, struct mem_cgroup
*memcg
, int order
)
527 static inline int memcg_cache_id(struct mem_cgroup
*memcg
)
532 static inline struct kmem_cache
*
533 memcg_kmem_get_cache(struct kmem_cache
*cachep
, gfp_t gfp
)
538 static inline void memcg_kmem_put_cache(struct kmem_cache
*cachep
)
541 #endif /* CONFIG_MEMCG_KMEM */
542 #endif /* _LINUX_MEMCONTROL_H */