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Balbir Singh8cdea7c2008-02-07 00:13:50 -08001/* memcontrol.h - Memory Controller
2 *
3 * Copyright IBM Corporation, 2007
4 * Author Balbir Singh <balbir@linux.vnet.ibm.com>
5 *
Pavel Emelianov78fb7462008-02-07 00:13:51 -08006 * Copyright 2007 OpenVZ SWsoft Inc
7 * Author: Pavel Emelianov <xemul@openvz.org>
8 *
Balbir Singh8cdea7c2008-02-07 00:13:50 -08009 * 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.
13 *
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.
18 */
19
20#ifndef _LINUX_MEMCONTROL_H
21#define _LINUX_MEMCONTROL_H
Hirokazu Takahashif8d665422009-01-07 18:08:02 -080022#include <linux/cgroup.h>
Ying Han456f9982011-05-26 16:25:38 -070023#include <linux/vm_event_item.h>
Glauber Costa7ae1e1d2012-12-18 14:21:56 -080024#include <linux/hardirq.h>
Glauber Costaa8964b92012-12-18 14:22:09 -080025#include <linux/jump_label.h>
Ying Han456f9982011-05-26 16:25:38 -070026
Pavel Emelianov78fb7462008-02-07 00:13:51 -080027struct mem_cgroup;
28struct page_cgroup;
Balbir Singh8697d332008-02-07 00:13:59 -080029struct page;
30struct mm_struct;
Glauber Costa2633d7a2012-12-18 14:22:34 -080031struct kmem_cache;
Pavel Emelianov78fb7462008-02-07 00:13:51 -080032
Greg Thelen2a7106f2011-01-13 15:47:37 -080033/* Stats that can be updated by kernel. */
34enum mem_cgroup_page_stat_item {
35 MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
36};
37
Johannes Weiner56600482012-01-12 17:17:59 -080038struct mem_cgroup_reclaim_cookie {
39 struct zone *zone;
40 int priority;
41 unsigned int generation;
42};
43
Andrew Mortonc255a452012-07-31 16:43:02 -070044#ifdef CONFIG_MEMCG
KAMEZAWA Hiroyuki2c26fdd2009-01-07 18:08:10 -080045/*
46 * All "charge" functions with gfp_mask should use GFP_KERNEL or
47 * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
48 * alloc memory but reclaims memory from all available zones. So, "where I want
49 * memory from" bits of gfp_mask has no meaning. So any bits of that field is
50 * available but adding a rule is better. charge functions' gfp_mask should
51 * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
52 * codes.
53 * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
54 */
Pavel Emelianov78fb7462008-02-07 00:13:51 -080055
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080056extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
Balbir Singhe1a1cd52008-02-07 00:14:02 -080057 gfp_t gfp_mask);
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080058/* for swap handling */
KAMEZAWA Hiroyuki8c7c6e342009-01-07 18:08:00 -080059extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
Johannes Weiner72835c82012-01-12 17:18:32 -080060 struct page *page, gfp_t mask, struct mem_cgroup **memcgp);
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080061extern void mem_cgroup_commit_charge_swapin(struct page *page,
Johannes Weiner72835c82012-01-12 17:18:32 -080062 struct mem_cgroup *memcg);
63extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg);
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080064
Hugh Dickins82895462008-03-04 14:29:08 -080065extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
66 gfp_t gfp_mask);
Johannes Weiner925b7672012-01-12 17:18:15 -080067
68struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
Hugh Dickinsfa9add62012-05-29 15:07:09 -070069struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
KAMEZAWA Hiroyuki569b8462009-12-15 16:47:03 -080070
71/* For coalescing uncharge for reducing memcg' overhead*/
72extern void mem_cgroup_uncharge_start(void);
73extern void mem_cgroup_uncharge_end(void);
74
Balbir Singh3c541e12008-02-07 00:14:41 -080075extern void mem_cgroup_uncharge_page(struct page *page);
KAMEZAWA Hiroyuki69029cd2008-07-25 01:47:14 -070076extern void mem_cgroup_uncharge_cache_page(struct page *page);
KAMEZAWA Hiroyukic9b0ed52008-07-25 01:47:15 -070077
Johannes Weinerc3ac9a82012-05-29 15:06:25 -070078bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
79 struct mem_cgroup *memcg);
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -070080int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg);
David Rientjes3062fc62008-02-07 00:14:03 -080081
Wu Fengguange42d9d52009-12-16 12:19:59 +010082extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
Balbir Singhcf475ad2008-04-29 01:00:16 -070083extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
KOSAKI Motohiroa4336582011-06-15 15:08:13 -070084extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);
Balbir Singhcf475ad2008-04-29 01:00:16 -070085
Glauber Costae1aab162011-12-11 21:47:03 +000086extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
Glauber Costad1a4c0b2011-12-11 21:47:04 +000087extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
Glauber Costae1aab162011-12-11 21:47:03 +000088
Lai Jiangshan2e4d4092009-01-07 18:08:07 -080089static inline
Johannes Weiner587af302012-10-08 16:34:12 -070090bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg)
Lai Jiangshan2e4d4092009-01-07 18:08:07 -080091{
Johannes Weiner587af302012-10-08 16:34:12 -070092 struct mem_cgroup *task_memcg;
93 bool match;
Johannes Weinerc3ac9a82012-05-29 15:06:25 -070094
Lai Jiangshan2e4d4092009-01-07 18:08:07 -080095 rcu_read_lock();
Johannes Weiner587af302012-10-08 16:34:12 -070096 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
97 match = __mem_cgroup_same_or_subtree(memcg, task_memcg);
Lai Jiangshan2e4d4092009-01-07 18:08:07 -080098 rcu_read_unlock();
Johannes Weinerc3ac9a82012-05-29 15:06:25 -070099 return match;
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800100}
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800101
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700102extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
Wu Fengguangd3242362009-12-16 12:19:59 +0100103
Johannes Weiner0030f532012-07-31 16:45:25 -0700104extern void
105mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
106 struct mem_cgroup **memcgp);
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700107extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
Daisuke Nishimura50de1dd2011-01-13 15:47:43 -0800108 struct page *oldpage, struct page *newpage, bool migration_ok);
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800109
Johannes Weiner56600482012-01-12 17:17:59 -0800110struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
111 struct mem_cgroup *,
112 struct mem_cgroup_reclaim_cookie *);
113void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
114
KAMEZAWA Hiroyuki58ae83d2008-02-07 00:14:32 -0800115/*
116 * For memory reclaim.
117 */
Konstantin Khlebnikovc56d5c72012-05-29 15:07:00 -0700118int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec);
119int mem_cgroup_inactive_file_is_low(struct lruvec *lruvec);
Ying Han889976d2011-05-26 16:25:33 -0700120int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
Hugh Dickins4d7dcca2012-05-29 15:07:08 -0700121unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700122void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
Balbir Singhe2224322009-04-02 16:57:39 -0700123extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
124 struct task_struct *p);
KAMEZAWA Hiroyukiab936cb2012-01-12 17:17:44 -0800125extern void mem_cgroup_replace_page_cache(struct page *oldpage,
126 struct page *newpage);
KAMEZAWA Hiroyuki58ae83d2008-02-07 00:14:32 -0800127
Andrew Mortonc255a452012-07-31 16:43:02 -0700128#ifdef CONFIG_MEMCG_SWAP
KAMEZAWA Hiroyukic0777192009-01-07 18:07:57 -0800129extern int do_swap_account;
130#endif
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800131
132static inline bool mem_cgroup_disabled(void)
133{
134 if (mem_cgroup_subsys.disabled)
135 return true;
136 return false;
137}
138
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700139void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked,
140 unsigned long *flags);
141
KAMEZAWA Hiroyuki4331f7d2012-03-21 16:34:26 -0700142extern atomic_t memcg_moving;
143
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700144static inline void mem_cgroup_begin_update_page_stat(struct page *page,
145 bool *locked, unsigned long *flags)
146{
147 if (mem_cgroup_disabled())
148 return;
149 rcu_read_lock();
150 *locked = false;
KAMEZAWA Hiroyuki4331f7d2012-03-21 16:34:26 -0700151 if (atomic_read(&memcg_moving))
152 __mem_cgroup_begin_update_page_stat(page, locked, flags);
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700153}
154
155void __mem_cgroup_end_update_page_stat(struct page *page,
156 unsigned long *flags);
157static inline void mem_cgroup_end_update_page_stat(struct page *page,
158 bool *locked, unsigned long *flags)
159{
160 if (mem_cgroup_disabled())
161 return;
162 if (*locked)
163 __mem_cgroup_end_update_page_stat(page, flags);
164 rcu_read_unlock();
165}
166
Greg Thelen2a7106f2011-01-13 15:47:37 -0800167void mem_cgroup_update_page_stat(struct page *page,
168 enum mem_cgroup_page_stat_item idx,
169 int val);
170
171static inline void mem_cgroup_inc_page_stat(struct page *page,
172 enum mem_cgroup_page_stat_item idx)
173{
174 mem_cgroup_update_page_stat(page, idx, 1);
175}
176
177static inline void mem_cgroup_dec_page_stat(struct page *page,
178 enum mem_cgroup_page_stat_item idx)
179{
180 mem_cgroup_update_page_stat(page, idx, -1);
181}
182
Balbir Singh4e416952009-09-23 15:56:39 -0700183unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
Ying Han0ae5e892011-05-26 16:25:25 -0700184 gfp_t gfp_mask,
185 unsigned long *total_scanned);
David Rientjesa63d83f2010-08-09 17:19:46 -0700186
David Rientjes68ae5642012-12-12 13:51:57 -0800187void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
188static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
189 enum vm_event_item idx)
190{
191 if (mem_cgroup_disabled())
192 return;
193 __mem_cgroup_count_vm_event(mm, idx);
194}
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800195#ifdef CONFIG_TRANSPARENT_HUGEPAGE
KAMEZAWA Hiroyukie94c8a92012-01-12 17:18:20 -0800196void mem_cgroup_split_huge_fixup(struct page *head);
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800197#endif
198
Daisuke Nishimuraf212ad72011-03-23 16:42:25 -0700199#ifdef CONFIG_DEBUG_VM
200bool mem_cgroup_bad_page_check(struct page *page);
201void mem_cgroup_print_bad_page(struct page *page);
202#endif
Andrew Mortonc255a452012-07-31 16:43:02 -0700203#else /* CONFIG_MEMCG */
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800204struct mem_cgroup;
205
206static inline int mem_cgroup_newpage_charge(struct page *page,
Hugh Dickins82895462008-03-04 14:29:08 -0800207 struct mm_struct *mm, gfp_t gfp_mask)
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800208{
209 return 0;
210}
211
Hugh Dickins82895462008-03-04 14:29:08 -0800212static inline int mem_cgroup_cache_charge(struct page *page,
213 struct mm_struct *mm, gfp_t gfp_mask)
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800214{
Hugh Dickins82895462008-03-04 14:29:08 -0800215 return 0;
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800216}
217
KAMEZAWA Hiroyuki8c7c6e342009-01-07 18:08:00 -0800218static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
Johannes Weiner72835c82012-01-12 17:18:32 -0800219 struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800220{
221 return 0;
222}
223
224static inline void mem_cgroup_commit_charge_swapin(struct page *page,
Johannes Weiner72835c82012-01-12 17:18:32 -0800225 struct mem_cgroup *memcg)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800226{
227}
228
Johannes Weiner72835c82012-01-12 17:18:32 -0800229static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800230{
231}
232
KAMEZAWA Hiroyuki569b8462009-12-15 16:47:03 -0800233static inline void mem_cgroup_uncharge_start(void)
234{
235}
236
237static inline void mem_cgroup_uncharge_end(void)
238{
239}
240
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800241static inline void mem_cgroup_uncharge_page(struct page *page)
242{
243}
244
KAMEZAWA Hiroyuki69029cd2008-07-25 01:47:14 -0700245static inline void mem_cgroup_uncharge_cache_page(struct page *page)
246{
247}
248
Johannes Weiner925b7672012-01-12 17:18:15 -0800249static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
250 struct mem_cgroup *memcg)
251{
252 return &zone->lruvec;
253}
254
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700255static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
256 struct zone *zone)
Minchan Kim3f58a822011-03-22 16:32:53 -0700257{
Johannes Weiner925b7672012-01-12 17:18:15 -0800258 return &zone->lruvec;
Balbir Singh66e17072008-02-07 00:13:56 -0800259}
260
Wu Fengguange42d9d52009-12-16 12:19:59 +0100261static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
262{
263 return NULL;
264}
265
KOSAKI Motohiroa4336582011-06-15 15:08:13 -0700266static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
267{
268 return NULL;
269}
270
Johannes Weiner587af302012-10-08 16:34:12 -0700271static inline bool mm_match_cgroup(struct mm_struct *mm,
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700272 struct mem_cgroup *memcg)
Balbir Singhbed71612008-02-07 00:14:01 -0800273{
Johannes Weiner587af302012-10-08 16:34:12 -0700274 return true;
Balbir Singhbed71612008-02-07 00:14:01 -0800275}
276
David Rientjes4c4a2212008-02-07 00:14:06 -0800277static inline int task_in_mem_cgroup(struct task_struct *task,
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700278 const struct mem_cgroup *memcg)
David Rientjes4c4a2212008-02-07 00:14:06 -0800279{
280 return 1;
281}
282
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700283static inline struct cgroup_subsys_state
284 *mem_cgroup_css(struct mem_cgroup *memcg)
Wu Fengguangd3242362009-12-16 12:19:59 +0100285{
286 return NULL;
287}
288
Johannes Weiner0030f532012-07-31 16:45:25 -0700289static inline void
akpm@linux-foundation.orgac39cf82010-05-26 14:42:46 -0700290mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
Johannes Weiner0030f532012-07-31 16:45:25 -0700291 struct mem_cgroup **memcgp)
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800292{
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800293}
294
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700295static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
Daisuke Nishimura50de1dd2011-01-13 15:47:43 -0800296 struct page *oldpage, struct page *newpage, bool migration_ok)
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800297{
298}
299
Johannes Weiner56600482012-01-12 17:17:59 -0800300static inline struct mem_cgroup *
301mem_cgroup_iter(struct mem_cgroup *root,
302 struct mem_cgroup *prev,
303 struct mem_cgroup_reclaim_cookie *reclaim)
304{
305 return NULL;
306}
307
308static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
309 struct mem_cgroup *prev)
310{
311}
312
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800313static inline bool mem_cgroup_disabled(void)
314{
315 return true;
316}
KAMEZAWA Hiroyukia636b322009-01-07 18:08:08 -0800317
KOSAKI Motohiro14797e22009-01-07 18:08:18 -0800318static inline int
Konstantin Khlebnikovc56d5c72012-05-29 15:07:00 -0700319mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
KOSAKI Motohiro14797e22009-01-07 18:08:18 -0800320{
321 return 1;
322}
323
Rik van Riel56e49d22009-06-16 15:32:28 -0700324static inline int
Konstantin Khlebnikovc56d5c72012-05-29 15:07:00 -0700325mem_cgroup_inactive_file_is_low(struct lruvec *lruvec)
Rik van Riel56e49d22009-06-16 15:32:28 -0700326{
327 return 1;
328}
329
KOSAKI Motohiroa3d8e052009-01-07 18:08:19 -0800330static inline unsigned long
Hugh Dickins4d7dcca2012-05-29 15:07:08 -0700331mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
KOSAKI Motohiroa3d8e052009-01-07 18:08:19 -0800332{
333 return 0;
334}
335
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700336static inline void
337mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
338 int increment)
KOSAKI Motohiro3e2f41f2009-01-07 18:08:20 -0800339{
KOSAKI Motohiro3e2f41f2009-01-07 18:08:20 -0800340}
341
Balbir Singhe2224322009-04-02 16:57:39 -0700342static inline void
343mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
344{
345}
346
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700347static inline void mem_cgroup_begin_update_page_stat(struct page *page,
348 bool *locked, unsigned long *flags)
349{
350}
351
352static inline void mem_cgroup_end_update_page_stat(struct page *page,
353 bool *locked, unsigned long *flags)
354{
355}
356
Greg Thelen2a7106f2011-01-13 15:47:37 -0800357static inline void mem_cgroup_inc_page_stat(struct page *page,
358 enum mem_cgroup_page_stat_item idx)
359{
360}
361
362static inline void mem_cgroup_dec_page_stat(struct page *page,
363 enum mem_cgroup_page_stat_item idx)
Balbir Singhd69b0422009-06-17 16:26:34 -0700364{
365}
366
Balbir Singh4e416952009-09-23 15:56:39 -0700367static inline
368unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
Ying Han0ae5e892011-05-26 16:25:25 -0700369 gfp_t gfp_mask,
370 unsigned long *total_scanned)
Balbir Singh4e416952009-09-23 15:56:39 -0700371{
372 return 0;
373}
374
KAMEZAWA Hiroyukie94c8a92012-01-12 17:18:20 -0800375static inline void mem_cgroup_split_huge_fixup(struct page *head)
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800376{
377}
378
Ying Han456f9982011-05-26 16:25:38 -0700379static inline
380void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
381{
382}
KAMEZAWA Hiroyukiab936cb2012-01-12 17:17:44 -0800383static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
384 struct page *newpage)
385{
386}
Andrew Mortonc255a452012-07-31 16:43:02 -0700387#endif /* CONFIG_MEMCG */
Pavel Emelianov78fb7462008-02-07 00:13:51 -0800388
Andrew Mortonc255a452012-07-31 16:43:02 -0700389#if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM)
Daisuke Nishimuraf212ad72011-03-23 16:42:25 -0700390static inline bool
391mem_cgroup_bad_page_check(struct page *page)
392{
393 return false;
394}
395
396static inline void
397mem_cgroup_print_bad_page(struct page *page)
398{
399}
400#endif
401
Glauber Costae1aab162011-12-11 21:47:03 +0000402enum {
403 UNDER_LIMIT,
404 SOFT_LIMIT,
405 OVER_LIMIT,
406};
407
408struct sock;
David Rientjescd590852012-10-10 15:54:08 -0700409#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
Glauber Costae1aab162011-12-11 21:47:03 +0000410void sock_update_memcg(struct sock *sk);
411void sock_release_memcg(struct sock *sk);
412#else
413static inline void sock_update_memcg(struct sock *sk)
414{
415}
416static inline void sock_release_memcg(struct sock *sk)
417{
418}
David Rientjescd590852012-10-10 15:54:08 -0700419#endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800420
421#ifdef CONFIG_MEMCG_KMEM
Glauber Costaa8964b92012-12-18 14:22:09 -0800422extern struct static_key memcg_kmem_enabled_key;
Glauber Costa749c5412012-12-18 14:23:01 -0800423
424extern int memcg_limited_groups_array_size;
Glauber Costaebe945c2012-12-18 14:23:10 -0800425
426/*
427 * Helper macro to loop through all memcg-specific caches. Callers must still
428 * check if the cache is valid (it is either valid or NULL).
429 * the slab_mutex must be held when looping through those caches
430 */
Glauber Costa749c5412012-12-18 14:23:01 -0800431#define for_each_memcg_cache_index(_idx) \
432 for ((_idx) = 0; i < memcg_limited_groups_array_size; (_idx)++)
433
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800434static inline bool memcg_kmem_enabled(void)
435{
Glauber Costaa8964b92012-12-18 14:22:09 -0800436 return static_key_false(&memcg_kmem_enabled_key);
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800437}
438
439/*
440 * In general, we'll do everything in our power to not incur in any overhead
441 * for non-memcg users for the kmem functions. Not even a function call, if we
442 * can avoid it.
443 *
444 * Therefore, we'll inline all those functions so that in the best case, we'll
445 * see that kmemcg is off for everybody and proceed quickly. If it is on,
446 * we'll still do most of the flag checking inline. We check a lot of
447 * conditions, but because they are pretty simple, they are expected to be
448 * fast.
449 */
450bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
451 int order);
452void __memcg_kmem_commit_charge(struct page *page,
453 struct mem_cgroup *memcg, int order);
454void __memcg_kmem_uncharge_pages(struct page *page, int order);
455
Glauber Costa2633d7a2012-12-18 14:22:34 -0800456int memcg_cache_id(struct mem_cgroup *memcg);
Glauber Costa943a4512012-12-18 14:23:03 -0800457int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s,
458 struct kmem_cache *root_cache);
Glauber Costa2633d7a2012-12-18 14:22:34 -0800459void memcg_release_cache(struct kmem_cache *cachep);
460void memcg_cache_list_add(struct mem_cgroup *memcg, struct kmem_cache *cachep);
461
Glauber Costa55007d82012-12-18 14:22:38 -0800462int memcg_update_cache_size(struct kmem_cache *s, int num_groups);
463void memcg_update_array_size(int num_groups);
Glauber Costad7f25f82012-12-18 14:22:40 -0800464
465struct kmem_cache *
466__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);
467
Glauber Costa1f458cb2012-12-18 14:22:50 -0800468void mem_cgroup_destroy_cache(struct kmem_cache *cachep);
Glauber Costa7cf27982012-12-18 14:22:55 -0800469void kmem_cache_destroy_memcg_children(struct kmem_cache *s);
Glauber Costa1f458cb2012-12-18 14:22:50 -0800470
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800471/**
472 * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
473 * @gfp: the gfp allocation flags.
474 * @memcg: a pointer to the memcg this was charged against.
475 * @order: allocation order.
476 *
477 * returns true if the memcg where the current task belongs can hold this
478 * allocation.
479 *
480 * We return true automatically if this allocation is not to be accounted to
481 * any memcg.
482 */
483static inline bool
484memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
485{
486 if (!memcg_kmem_enabled())
487 return true;
488
489 /*
490 * __GFP_NOFAIL allocations will move on even if charging is not
491 * possible. Therefore we don't even try, and have this allocation
492 * unaccounted. We could in theory charge it with
493 * res_counter_charge_nofail, but we hope those allocations are rare,
494 * and won't be worth the trouble.
495 */
496 if (!(gfp & __GFP_KMEMCG) || (gfp & __GFP_NOFAIL))
497 return true;
498 if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
499 return true;
500
501 /* If the test is dying, just let it go. */
502 if (unlikely(fatal_signal_pending(current)))
503 return true;
504
505 return __memcg_kmem_newpage_charge(gfp, memcg, order);
506}
507
508/**
509 * memcg_kmem_uncharge_pages: uncharge pages from memcg
510 * @page: pointer to struct page being freed
511 * @order: allocation order.
512 *
513 * there is no need to specify memcg here, since it is embedded in page_cgroup
514 */
515static inline void
516memcg_kmem_uncharge_pages(struct page *page, int order)
517{
518 if (memcg_kmem_enabled())
519 __memcg_kmem_uncharge_pages(page, order);
520}
521
522/**
523 * memcg_kmem_commit_charge: embeds correct memcg in a page
524 * @page: pointer to struct page recently allocated
525 * @memcg: the memcg structure we charged against
526 * @order: allocation order.
527 *
528 * Needs to be called after memcg_kmem_newpage_charge, regardless of success or
529 * failure of the allocation. if @page is NULL, this function will revert the
530 * charges. Otherwise, it will commit the memcg given by @memcg to the
531 * corresponding page_cgroup.
532 */
533static inline void
534memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
535{
536 if (memcg_kmem_enabled() && memcg)
537 __memcg_kmem_commit_charge(page, memcg, order);
538}
539
Glauber Costad7f25f82012-12-18 14:22:40 -0800540/**
541 * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation
542 * @cachep: the original global kmem cache
543 * @gfp: allocation flags.
544 *
545 * This function assumes that the task allocating, which determines the memcg
546 * in the page allocator, belongs to the same cgroup throughout the whole
547 * process. Misacounting can happen if the task calls memcg_kmem_get_cache()
548 * while belonging to a cgroup, and later on changes. This is considered
549 * acceptable, and should only happen upon task migration.
550 *
551 * Before the cache is created by the memcg core, there is also a possible
552 * imbalance: the task belongs to a memcg, but the cache being allocated from
553 * is the global cache, since the child cache is not yet guaranteed to be
554 * ready. This case is also fine, since in this case the GFP_KMEMCG will not be
555 * passed and the page allocator will not attempt any cgroup accounting.
556 */
557static __always_inline struct kmem_cache *
558memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
559{
560 if (!memcg_kmem_enabled())
561 return cachep;
562 if (gfp & __GFP_NOFAIL)
563 return cachep;
564 if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
565 return cachep;
566 if (unlikely(fatal_signal_pending(current)))
567 return cachep;
568
569 return __memcg_kmem_get_cache(cachep, gfp);
570}
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800571#else
Glauber Costa749c5412012-12-18 14:23:01 -0800572#define for_each_memcg_cache_index(_idx) \
573 for (; NULL; )
574
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800575static inline bool memcg_kmem_enabled(void)
576{
577 return false;
578}
579
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800580static inline bool
581memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
582{
583 return true;
584}
585
586static inline void memcg_kmem_uncharge_pages(struct page *page, int order)
587{
588}
589
590static inline void
591memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
592{
593}
Glauber Costa2633d7a2012-12-18 14:22:34 -0800594
595static inline int memcg_cache_id(struct mem_cgroup *memcg)
596{
597 return -1;
598}
599
Glauber Costa943a4512012-12-18 14:23:03 -0800600static inline int
601memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s,
602 struct kmem_cache *root_cache)
Glauber Costa2633d7a2012-12-18 14:22:34 -0800603{
604 return 0;
605}
606
607static inline void memcg_release_cache(struct kmem_cache *cachep)
608{
609}
610
611static inline void memcg_cache_list_add(struct mem_cgroup *memcg,
612 struct kmem_cache *s)
613{
614}
Glauber Costad7f25f82012-12-18 14:22:40 -0800615
616static inline struct kmem_cache *
617memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
618{
619 return cachep;
620}
Glauber Costa7cf27982012-12-18 14:22:55 -0800621
622static inline void kmem_cache_destroy_memcg_children(struct kmem_cache *s)
623{
624}
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800625#endif /* CONFIG_MEMCG_KMEM */
Balbir Singh8cdea7c2008-02-07 00:13:50 -0800626#endif /* _LINUX_MEMCONTROL_H */
627