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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;
Balbir Singh8697d332008-02-07 00:13:59 -080028struct page;
29struct mm_struct;
Glauber Costa2633d7a2012-12-18 14:22:34 -080030struct kmem_cache;
Pavel Emelianov78fb7462008-02-07 00:13:51 -080031
Sha Zhengju68b48762013-09-12 15:13:50 -070032/*
33 * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c,
34 * These two lists should keep in accord with each other.
35 */
36enum mem_cgroup_stat_index {
37 /*
38 * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
39 */
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 */
Sha Zhengju3ea67d02013-09-12 15:13:53 -070044 MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */
Sha Zhengju68b48762013-09-12 15:13:50 -070045 MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
46 MEM_CGROUP_STAT_NSTATS,
Greg Thelen2a7106f2011-01-13 15:47:37 -080047};
48
Johannes Weiner56600482012-01-12 17:17:59 -080049struct mem_cgroup_reclaim_cookie {
50 struct zone *zone;
51 int priority;
52 unsigned int generation;
53};
54
Johannes Weiner241994e2015-02-11 15:26:06 -080055enum mem_cgroup_events_index {
56 MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */
57 MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */
58 MEM_CGROUP_EVENTS_PGFAULT, /* # of page-faults */
59 MEM_CGROUP_EVENTS_PGMAJFAULT, /* # of major page-faults */
60 MEM_CGROUP_EVENTS_NSTATS,
61 /* default hierarchy events */
62 MEMCG_LOW = MEM_CGROUP_EVENTS_NSTATS,
63 MEMCG_HIGH,
64 MEMCG_MAX,
65 MEMCG_OOM,
66 MEMCG_NR_EVENTS,
67};
68
Andrew Mortonc255a452012-07-31 16:43:02 -070069#ifdef CONFIG_MEMCG
Johannes Weiner241994e2015-02-11 15:26:06 -080070void mem_cgroup_events(struct mem_cgroup *memcg,
71 enum mem_cgroup_events_index idx,
72 unsigned int nr);
73
74bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg);
75
Johannes Weiner00501b52014-08-08 14:19:20 -070076int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
77 gfp_t gfp_mask, struct mem_cgroup **memcgp);
78void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
79 bool lrucare);
80void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg);
Johannes Weiner0a31bc92014-08-08 14:19:22 -070081void mem_cgroup_uncharge(struct page *page);
Johannes Weiner747db952014-08-08 14:19:24 -070082void mem_cgroup_uncharge_list(struct list_head *page_list);
Johannes Weiner0a31bc92014-08-08 14:19:22 -070083
84void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
85 bool lrucare);
86
Johannes Weiner925b7672012-01-12 17:18:15 -080087struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
Hugh Dickinsfa9add62012-05-29 15:07:09 -070088struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
KAMEZAWA Hiroyuki569b8462009-12-15 16:47:03 -080089
Johannes Weiner2314b422014-12-10 15:44:33 -080090bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
91 struct mem_cgroup *root);
92bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
David Rientjes3062fc62008-02-07 00:14:03 -080093
Wu Fengguange42d9d52009-12-16 12:19:59 +010094extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
Balbir Singhcf475ad2008-04-29 01:00:16 -070095extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
96
Glauber Costae1aab162011-12-11 21:47:03 +000097extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
Tejun Heo182446d2013-08-08 20:11:24 -040098extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css);
Glauber Costae1aab162011-12-11 21:47:03 +000099
Johannes Weiner2314b422014-12-10 15:44:33 -0800100static inline bool mm_match_cgroup(struct mm_struct *mm,
101 struct mem_cgroup *memcg)
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800102{
Johannes Weiner587af302012-10-08 16:34:12 -0700103 struct mem_cgroup *task_memcg;
Johannes Weiner413918b2014-12-10 15:44:30 -0800104 bool match = false;
Johannes Weinerc3ac9a82012-05-29 15:06:25 -0700105
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800106 rcu_read_lock();
Johannes Weiner587af302012-10-08 16:34:12 -0700107 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
Johannes Weiner413918b2014-12-10 15:44:30 -0800108 if (task_memcg)
Johannes Weiner2314b422014-12-10 15:44:33 -0800109 match = mem_cgroup_is_descendant(task_memcg, memcg);
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800110 rcu_read_unlock();
Johannes Weinerc3ac9a82012-05-29 15:06:25 -0700111 return match;
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800112}
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800113
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700114extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
Wu Fengguangd3242362009-12-16 12:19:59 +0100115
Andrew Morton694fbc02013-09-24 15:27:37 -0700116struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
117 struct mem_cgroup *,
118 struct mem_cgroup_reclaim_cookie *);
Johannes Weiner56600482012-01-12 17:17:59 -0800119void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
120
KAMEZAWA Hiroyuki58ae83d2008-02-07 00:14:32 -0800121/*
122 * For memory reclaim.
123 */
Konstantin Khlebnikovc56d5c72012-05-29 15:07:00 -0700124int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec);
Vladimir Davydov90cbc252015-02-11 15:25:55 -0800125bool mem_cgroup_lruvec_online(struct lruvec *lruvec);
Ying Han889976d2011-05-26 16:25:33 -0700126int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
Hugh Dickins4d7dcca2012-05-29 15:07:08 -0700127unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700128void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
Balbir Singhe2224322009-04-02 16:57:39 -0700129extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
130 struct task_struct *p);
KAMEZAWA Hiroyuki58ae83d2008-02-07 00:14:32 -0800131
Johannes Weiner49426422013-10-16 13:46:59 -0700132static inline void mem_cgroup_oom_enable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700133{
Johannes Weiner49426422013-10-16 13:46:59 -0700134 WARN_ON(current->memcg_oom.may_oom);
135 current->memcg_oom.may_oom = 1;
Johannes Weiner519e5242013-09-12 15:13:42 -0700136}
137
Johannes Weiner49426422013-10-16 13:46:59 -0700138static inline void mem_cgroup_oom_disable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700139{
Johannes Weiner49426422013-10-16 13:46:59 -0700140 WARN_ON(!current->memcg_oom.may_oom);
141 current->memcg_oom.may_oom = 0;
Johannes Weiner519e5242013-09-12 15:13:42 -0700142}
143
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700144static inline bool task_in_memcg_oom(struct task_struct *p)
145{
Johannes Weiner49426422013-10-16 13:46:59 -0700146 return p->memcg_oom.memcg;
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700147}
148
Johannes Weiner49426422013-10-16 13:46:59 -0700149bool mem_cgroup_oom_synchronize(bool wait);
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700150
Andrew Mortonc255a452012-07-31 16:43:02 -0700151#ifdef CONFIG_MEMCG_SWAP
KAMEZAWA Hiroyukic0777192009-01-07 18:07:57 -0800152extern int do_swap_account;
153#endif
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800154
155static inline bool mem_cgroup_disabled(void)
156{
Tejun Heo073219e2014-02-08 10:36:58 -0500157 if (memory_cgrp_subsys.disabled)
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800158 return true;
159 return false;
160}
161
Johannes Weiner6de22612015-02-11 15:25:01 -0800162struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page);
Johannes Weinerd7365e72014-10-29 14:50:48 -0700163void mem_cgroup_update_page_stat(struct mem_cgroup *memcg,
164 enum mem_cgroup_stat_index idx, int val);
Johannes Weiner6de22612015-02-11 15:25:01 -0800165void mem_cgroup_end_page_stat(struct mem_cgroup *memcg);
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700166
Johannes Weinerd7365e72014-10-29 14:50:48 -0700167static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg,
Sha Zhengju68b48762013-09-12 15:13:50 -0700168 enum mem_cgroup_stat_index idx)
Greg Thelen2a7106f2011-01-13 15:47:37 -0800169{
Johannes Weinerd7365e72014-10-29 14:50:48 -0700170 mem_cgroup_update_page_stat(memcg, idx, 1);
Greg Thelen2a7106f2011-01-13 15:47:37 -0800171}
172
Johannes Weinerd7365e72014-10-29 14:50:48 -0700173static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg,
Sha Zhengju68b48762013-09-12 15:13:50 -0700174 enum mem_cgroup_stat_index idx)
Greg Thelen2a7106f2011-01-13 15:47:37 -0800175{
Johannes Weinerd7365e72014-10-29 14:50:48 -0700176 mem_cgroup_update_page_stat(memcg, idx, -1);
Greg Thelen2a7106f2011-01-13 15:47:37 -0800177}
178
Andrew Morton0608f432013-09-24 15:27:41 -0700179unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
180 gfp_t gfp_mask,
181 unsigned long *total_scanned);
David Rientjesa63d83f2010-08-09 17:19:46 -0700182
David Rientjes68ae5642012-12-12 13:51:57 -0800183void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
184static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
185 enum vm_event_item idx)
186{
187 if (mem_cgroup_disabled())
188 return;
189 __mem_cgroup_count_vm_event(mm, idx);
190}
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800191#ifdef CONFIG_TRANSPARENT_HUGEPAGE
KAMEZAWA Hiroyukie94c8a92012-01-12 17:18:20 -0800192void mem_cgroup_split_huge_fixup(struct page *head);
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800193#endif
194
Andrew Mortonc255a452012-07-31 16:43:02 -0700195#else /* CONFIG_MEMCG */
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800196struct mem_cgroup;
197
Johannes Weiner241994e2015-02-11 15:26:06 -0800198static inline void mem_cgroup_events(struct mem_cgroup *memcg,
199 enum mem_cgroup_events_index idx,
200 unsigned int nr)
201{
202}
203
204static inline bool mem_cgroup_low(struct mem_cgroup *root,
205 struct mem_cgroup *memcg)
206{
207 return false;
208}
209
Johannes Weiner00501b52014-08-08 14:19:20 -0700210static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
211 gfp_t gfp_mask,
212 struct mem_cgroup **memcgp)
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800213{
Johannes Weiner00501b52014-08-08 14:19:20 -0700214 *memcgp = NULL;
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800215 return 0;
216}
217
Johannes Weiner00501b52014-08-08 14:19:20 -0700218static inline void mem_cgroup_commit_charge(struct page *page,
219 struct mem_cgroup *memcg,
220 bool lrucare)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800221{
222}
223
Johannes Weiner00501b52014-08-08 14:19:20 -0700224static inline void mem_cgroup_cancel_charge(struct page *page,
225 struct mem_cgroup *memcg)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800226{
227}
228
Johannes Weiner0a31bc92014-08-08 14:19:22 -0700229static inline void mem_cgroup_uncharge(struct page *page)
230{
231}
232
Johannes Weiner747db952014-08-08 14:19:24 -0700233static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
KAMEZAWA Hiroyuki569b8462009-12-15 16:47:03 -0800234{
235}
236
Johannes Weiner0a31bc92014-08-08 14:19:22 -0700237static inline void mem_cgroup_migrate(struct page *oldpage,
238 struct page *newpage,
239 bool lrucare)
KAMEZAWA Hiroyuki69029cd2008-07-25 01:47:14 -0700240{
241}
242
Johannes Weiner925b7672012-01-12 17:18:15 -0800243static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
244 struct mem_cgroup *memcg)
245{
246 return &zone->lruvec;
247}
248
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700249static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
250 struct zone *zone)
Minchan Kim3f58a822011-03-22 16:32:53 -0700251{
Johannes Weiner925b7672012-01-12 17:18:15 -0800252 return &zone->lruvec;
Balbir Singh66e17072008-02-07 00:13:56 -0800253}
254
Wu Fengguange42d9d52009-12-16 12:19:59 +0100255static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
256{
257 return NULL;
258}
259
Johannes Weiner587af302012-10-08 16:34:12 -0700260static inline bool mm_match_cgroup(struct mm_struct *mm,
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700261 struct mem_cgroup *memcg)
Balbir Singhbed71612008-02-07 00:14:01 -0800262{
Johannes Weiner587af302012-10-08 16:34:12 -0700263 return true;
Balbir Singhbed71612008-02-07 00:14:01 -0800264}
265
David Rientjesffbdccf2013-07-03 15:01:23 -0700266static inline bool task_in_mem_cgroup(struct task_struct *task,
267 const struct mem_cgroup *memcg)
David Rientjes4c4a2212008-02-07 00:14:06 -0800268{
David Rientjesffbdccf2013-07-03 15:01:23 -0700269 return true;
David Rientjes4c4a2212008-02-07 00:14:06 -0800270}
271
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700272static inline struct cgroup_subsys_state
273 *mem_cgroup_css(struct mem_cgroup *memcg)
Wu Fengguangd3242362009-12-16 12:19:59 +0100274{
275 return NULL;
276}
277
Johannes Weiner56600482012-01-12 17:17:59 -0800278static inline struct mem_cgroup *
279mem_cgroup_iter(struct mem_cgroup *root,
280 struct mem_cgroup *prev,
281 struct mem_cgroup_reclaim_cookie *reclaim)
282{
283 return NULL;
284}
285
286static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
287 struct mem_cgroup *prev)
288{
289}
290
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800291static inline bool mem_cgroup_disabled(void)
292{
293 return true;
294}
KAMEZAWA Hiroyukia636b322009-01-07 18:08:08 -0800295
KOSAKI Motohiro14797e22009-01-07 18:08:18 -0800296static inline int
Konstantin Khlebnikovc56d5c72012-05-29 15:07:00 -0700297mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
KOSAKI Motohiro14797e22009-01-07 18:08:18 -0800298{
299 return 1;
300}
301
Vladimir Davydov90cbc252015-02-11 15:25:55 -0800302static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec)
303{
304 return true;
305}
306
KOSAKI Motohiroa3d8e052009-01-07 18:08:19 -0800307static inline unsigned long
Hugh Dickins4d7dcca2012-05-29 15:07:08 -0700308mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
KOSAKI Motohiroa3d8e052009-01-07 18:08:19 -0800309{
310 return 0;
311}
312
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700313static inline void
314mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
315 int increment)
KOSAKI Motohiro3e2f41f2009-01-07 18:08:20 -0800316{
KOSAKI Motohiro3e2f41f2009-01-07 18:08:20 -0800317}
318
Balbir Singhe2224322009-04-02 16:57:39 -0700319static inline void
320mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
321{
322}
323
Johannes Weiner6de22612015-02-11 15:25:01 -0800324static inline struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page)
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700325{
Johannes Weinerd7365e72014-10-29 14:50:48 -0700326 return NULL;
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700327}
328
Johannes Weiner6de22612015-02-11 15:25:01 -0800329static inline void mem_cgroup_end_page_stat(struct mem_cgroup *memcg)
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700330{
331}
332
Johannes Weiner49426422013-10-16 13:46:59 -0700333static inline void mem_cgroup_oom_enable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700334{
335}
336
Johannes Weiner49426422013-10-16 13:46:59 -0700337static inline void mem_cgroup_oom_disable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700338{
339}
340
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700341static inline bool task_in_memcg_oom(struct task_struct *p)
342{
343 return false;
344}
345
Johannes Weiner49426422013-10-16 13:46:59 -0700346static inline bool mem_cgroup_oom_synchronize(bool wait)
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700347{
348 return false;
349}
350
Johannes Weinerd7365e72014-10-29 14:50:48 -0700351static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg,
Sha Zhengju68b48762013-09-12 15:13:50 -0700352 enum mem_cgroup_stat_index idx)
Greg Thelen2a7106f2011-01-13 15:47:37 -0800353{
354}
355
Johannes Weinerd7365e72014-10-29 14:50:48 -0700356static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg,
Sha Zhengju68b48762013-09-12 15:13:50 -0700357 enum mem_cgroup_stat_index idx)
Balbir Singhd69b0422009-06-17 16:26:34 -0700358{
359}
360
Balbir Singh4e416952009-09-23 15:56:39 -0700361static inline
Andrew Morton0608f432013-09-24 15:27:41 -0700362unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
363 gfp_t gfp_mask,
364 unsigned long *total_scanned)
Balbir Singh4e416952009-09-23 15:56:39 -0700365{
Andrew Morton0608f432013-09-24 15:27:41 -0700366 return 0;
Balbir Singh4e416952009-09-23 15:56:39 -0700367}
368
KAMEZAWA Hiroyukie94c8a92012-01-12 17:18:20 -0800369static inline void mem_cgroup_split_huge_fixup(struct page *head)
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800370{
371}
372
Ying Han456f9982011-05-26 16:25:38 -0700373static inline
374void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
375{
376}
Andrew Mortonc255a452012-07-31 16:43:02 -0700377#endif /* CONFIG_MEMCG */
Pavel Emelianov78fb7462008-02-07 00:13:51 -0800378
Glauber Costae1aab162011-12-11 21:47:03 +0000379enum {
380 UNDER_LIMIT,
381 SOFT_LIMIT,
382 OVER_LIMIT,
383};
384
385struct sock;
David Rientjescd590852012-10-10 15:54:08 -0700386#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
Glauber Costae1aab162011-12-11 21:47:03 +0000387void sock_update_memcg(struct sock *sk);
388void sock_release_memcg(struct sock *sk);
389#else
390static inline void sock_update_memcg(struct sock *sk)
391{
392}
393static inline void sock_release_memcg(struct sock *sk)
394{
395}
David Rientjescd590852012-10-10 15:54:08 -0700396#endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800397
398#ifdef CONFIG_MEMCG_KMEM
Glauber Costaa8964b92012-12-18 14:22:09 -0800399extern struct static_key memcg_kmem_enabled_key;
Glauber Costa749c5412012-12-18 14:23:01 -0800400
Vladimir Davydovdbcf73e2015-02-12 14:58:57 -0800401extern int memcg_nr_cache_ids;
Vladimir Davydov05257a12015-02-12 14:59:01 -0800402extern void memcg_get_cache_ids(void);
403extern void memcg_put_cache_ids(void);
Glauber Costaebe945c2012-12-18 14:23:10 -0800404
405/*
406 * Helper macro to loop through all memcg-specific caches. Callers must still
407 * check if the cache is valid (it is either valid or NULL).
408 * the slab_mutex must be held when looping through those caches
409 */
Glauber Costa749c5412012-12-18 14:23:01 -0800410#define for_each_memcg_cache_index(_idx) \
Vladimir Davydovdbcf73e2015-02-12 14:58:57 -0800411 for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++)
Glauber Costa749c5412012-12-18 14:23:01 -0800412
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800413static inline bool memcg_kmem_enabled(void)
414{
Glauber Costaa8964b92012-12-18 14:22:09 -0800415 return static_key_false(&memcg_kmem_enabled_key);
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800416}
417
Vladimir Davydovcb731d62015-02-12 14:58:54 -0800418bool memcg_kmem_is_active(struct mem_cgroup *memcg);
419
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800420/*
421 * In general, we'll do everything in our power to not incur in any overhead
422 * for non-memcg users for the kmem functions. Not even a function call, if we
423 * can avoid it.
424 *
425 * Therefore, we'll inline all those functions so that in the best case, we'll
426 * see that kmemcg is off for everybody and proceed quickly. If it is on,
427 * we'll still do most of the flag checking inline. We check a lot of
428 * conditions, but because they are pretty simple, they are expected to be
429 * fast.
430 */
431bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
432 int order);
433void __memcg_kmem_commit_charge(struct page *page,
434 struct mem_cgroup *memcg, int order);
435void __memcg_kmem_uncharge_pages(struct page *page, int order);
436
Glauber Costa2633d7a2012-12-18 14:22:34 -0800437int memcg_cache_id(struct mem_cgroup *memcg);
Vladimir Davydov5722d092014-04-07 15:39:24 -0700438
Vladimir Davydov8135be52014-12-12 16:56:38 -0800439struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep);
440void __memcg_kmem_put_cache(struct kmem_cache *cachep);
Glauber Costad7f25f82012-12-18 14:22:40 -0800441
Vladimir Davydov60d3fd32015-02-12 14:59:10 -0800442struct mem_cgroup *__mem_cgroup_from_kmem(void *ptr);
443
Vladimir Davydovdbf22eb2015-02-10 14:11:41 -0800444int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp,
445 unsigned long nr_pages);
446void memcg_uncharge_kmem(struct mem_cgroup *memcg, unsigned long nr_pages);
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700447
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800448/**
449 * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
450 * @gfp: the gfp allocation flags.
451 * @memcg: a pointer to the memcg this was charged against.
452 * @order: allocation order.
453 *
454 * returns true if the memcg where the current task belongs can hold this
455 * allocation.
456 *
457 * We return true automatically if this allocation is not to be accounted to
458 * any memcg.
459 */
460static inline bool
461memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
462{
463 if (!memcg_kmem_enabled())
464 return true;
465
Vladimir Davydov8f4fc072015-05-14 15:16:55 -0700466 if (gfp & __GFP_NOACCOUNT)
467 return true;
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800468 /*
469 * __GFP_NOFAIL allocations will move on even if charging is not
470 * possible. Therefore we don't even try, and have this allocation
Johannes Weiner3e32cb22014-12-10 15:42:31 -0800471 * unaccounted. We could in theory charge it forcibly, but we hope
472 * those allocations are rare, and won't be worth the trouble.
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800473 */
Vladimir Davydov52383432014-06-04 16:06:39 -0700474 if (gfp & __GFP_NOFAIL)
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800475 return true;
476 if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
477 return true;
478
479 /* If the test is dying, just let it go. */
480 if (unlikely(fatal_signal_pending(current)))
481 return true;
482
483 return __memcg_kmem_newpage_charge(gfp, memcg, order);
484}
485
486/**
487 * memcg_kmem_uncharge_pages: uncharge pages from memcg
488 * @page: pointer to struct page being freed
489 * @order: allocation order.
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800490 */
491static inline void
492memcg_kmem_uncharge_pages(struct page *page, int order)
493{
494 if (memcg_kmem_enabled())
495 __memcg_kmem_uncharge_pages(page, order);
496}
497
498/**
499 * memcg_kmem_commit_charge: embeds correct memcg in a page
500 * @page: pointer to struct page recently allocated
501 * @memcg: the memcg structure we charged against
502 * @order: allocation order.
503 *
504 * Needs to be called after memcg_kmem_newpage_charge, regardless of success or
505 * failure of the allocation. if @page is NULL, this function will revert the
Johannes Weiner1306a852014-12-10 15:44:52 -0800506 * charges. Otherwise, it will commit @page to @memcg.
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800507 */
508static inline void
509memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
510{
511 if (memcg_kmem_enabled() && memcg)
512 __memcg_kmem_commit_charge(page, memcg, order);
513}
514
Glauber Costad7f25f82012-12-18 14:22:40 -0800515/**
516 * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation
517 * @cachep: the original global kmem cache
518 * @gfp: allocation flags.
519 *
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700520 * All memory allocated from a per-memcg cache is charged to the owner memcg.
Glauber Costad7f25f82012-12-18 14:22:40 -0800521 */
522static __always_inline struct kmem_cache *
523memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
524{
525 if (!memcg_kmem_enabled())
526 return cachep;
Vladimir Davydov8f4fc072015-05-14 15:16:55 -0700527 if (gfp & __GFP_NOACCOUNT)
528 return cachep;
Glauber Costad7f25f82012-12-18 14:22:40 -0800529 if (gfp & __GFP_NOFAIL)
530 return cachep;
531 if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
532 return cachep;
533 if (unlikely(fatal_signal_pending(current)))
534 return cachep;
535
Zhang Zhen056b7cc2014-12-12 16:55:38 -0800536 return __memcg_kmem_get_cache(cachep);
Glauber Costad7f25f82012-12-18 14:22:40 -0800537}
Vladimir Davydov8135be52014-12-12 16:56:38 -0800538
539static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep)
540{
541 if (memcg_kmem_enabled())
542 __memcg_kmem_put_cache(cachep);
543}
Vladimir Davydov60d3fd32015-02-12 14:59:10 -0800544
545static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
546{
547 if (!memcg_kmem_enabled())
548 return NULL;
549 return __mem_cgroup_from_kmem(ptr);
550}
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800551#else
Glauber Costa749c5412012-12-18 14:23:01 -0800552#define for_each_memcg_cache_index(_idx) \
553 for (; NULL; )
554
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800555static inline bool memcg_kmem_enabled(void)
556{
557 return false;
558}
559
Vladimir Davydovcb731d62015-02-12 14:58:54 -0800560static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg)
561{
562 return false;
563}
564
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800565static inline bool
566memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
567{
568 return true;
569}
570
571static inline void memcg_kmem_uncharge_pages(struct page *page, int order)
572{
573}
574
575static inline void
576memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
577{
578}
Glauber Costa2633d7a2012-12-18 14:22:34 -0800579
580static inline int memcg_cache_id(struct mem_cgroup *memcg)
581{
582 return -1;
583}
584
Vladimir Davydov05257a12015-02-12 14:59:01 -0800585static inline void memcg_get_cache_ids(void)
586{
587}
588
589static inline void memcg_put_cache_ids(void)
590{
591}
592
Glauber Costad7f25f82012-12-18 14:22:40 -0800593static inline struct kmem_cache *
594memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
595{
596 return cachep;
597}
Vladimir Davydov8135be52014-12-12 16:56:38 -0800598
599static inline void memcg_kmem_put_cache(struct kmem_cache *cachep)
600{
601}
Vladimir Davydov60d3fd32015-02-12 14:59:10 -0800602
603static inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
604{
605 return NULL;
606}
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800607#endif /* CONFIG_MEMCG_KMEM */
Balbir Singh8cdea7c2008-02-07 00:13:50 -0800608#endif /* _LINUX_MEMCONTROL_H */
609