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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
Sha Zhengju68b48762013-09-12 15:13:50 -070033/*
34 * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c,
35 * These two lists should keep in accord with each other.
36 */
37enum mem_cgroup_stat_index {
38 /*
39 * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
40 */
41 MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
42 MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
43 MEM_CGROUP_STAT_RSS_HUGE, /* # of pages charged as anon huge */
44 MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
Sha Zhengju3ea67d02013-09-12 15:13:53 -070045 MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */
Sha Zhengju68b48762013-09-12 15:13:50 -070046 MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
47 MEM_CGROUP_STAT_NSTATS,
Greg Thelen2a7106f2011-01-13 15:47:37 -080048};
49
Johannes Weiner56600482012-01-12 17:17:59 -080050struct mem_cgroup_reclaim_cookie {
51 struct zone *zone;
52 int priority;
53 unsigned int generation;
54};
55
Andrew Mortonc255a452012-07-31 16:43:02 -070056#ifdef CONFIG_MEMCG
KAMEZAWA Hiroyuki2c26fdd2009-01-07 18:08:10 -080057/*
58 * All "charge" functions with gfp_mask should use GFP_KERNEL or
59 * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
60 * alloc memory but reclaims memory from all available zones. So, "where I want
61 * memory from" bits of gfp_mask has no meaning. So any bits of that field is
62 * available but adding a rule is better. charge functions' gfp_mask should
63 * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
64 * codes.
65 * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
66 */
Pavel Emelianov78fb7462008-02-07 00:13:51 -080067
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080068extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
Balbir Singhe1a1cd52008-02-07 00:14:02 -080069 gfp_t gfp_mask);
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080070/* for swap handling */
KAMEZAWA Hiroyuki8c7c6e342009-01-07 18:08:00 -080071extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
Johannes Weiner72835c82012-01-12 17:18:32 -080072 struct page *page, gfp_t mask, struct mem_cgroup **memcgp);
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080073extern void mem_cgroup_commit_charge_swapin(struct page *page,
Johannes Weiner72835c82012-01-12 17:18:32 -080074 struct mem_cgroup *memcg);
75extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg);
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080076
Hugh Dickins82895462008-03-04 14:29:08 -080077extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
78 gfp_t gfp_mask);
Johannes Weiner925b7672012-01-12 17:18:15 -080079
80struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
Hugh Dickinsfa9add62012-05-29 15:07:09 -070081struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
KAMEZAWA Hiroyuki569b8462009-12-15 16:47:03 -080082
83/* For coalescing uncharge for reducing memcg' overhead*/
84extern void mem_cgroup_uncharge_start(void);
85extern void mem_cgroup_uncharge_end(void);
86
Balbir Singh3c541e12008-02-07 00:14:41 -080087extern void mem_cgroup_uncharge_page(struct page *page);
KAMEZAWA Hiroyuki69029cd2008-07-25 01:47:14 -070088extern void mem_cgroup_uncharge_cache_page(struct page *page);
KAMEZAWA Hiroyukic9b0ed52008-07-25 01:47:15 -070089
Johannes Weinerc3ac9a82012-05-29 15:06:25 -070090bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
91 struct mem_cgroup *memcg);
David Rientjesffbdccf2013-07-03 15:01:23 -070092bool task_in_mem_cgroup(struct task_struct *task,
93 const struct mem_cgroup *memcg);
David Rientjes3062fc62008-02-07 00:14:03 -080094
Wu Fengguange42d9d52009-12-16 12:19:59 +010095extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
Balbir Singhcf475ad2008-04-29 01:00:16 -070096extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
KOSAKI Motohiroa4336582011-06-15 15:08:13 -070097extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);
Balbir Singhcf475ad2008-04-29 01:00:16 -070098
Glauber Costae1aab162011-12-11 21:47:03 +000099extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
Tejun Heo182446d2013-08-08 20:11:24 -0400100extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css);
Glauber Costae1aab162011-12-11 21:47:03 +0000101
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800102static inline
Johannes Weiner587af302012-10-08 16:34:12 -0700103bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg)
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800104{
Johannes Weiner587af302012-10-08 16:34:12 -0700105 struct mem_cgroup *task_memcg;
106 bool match;
Johannes Weinerc3ac9a82012-05-29 15:06:25 -0700107
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800108 rcu_read_lock();
Johannes Weiner587af302012-10-08 16:34:12 -0700109 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
110 match = __mem_cgroup_same_or_subtree(memcg, task_memcg);
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800111 rcu_read_unlock();
Johannes Weinerc3ac9a82012-05-29 15:06:25 -0700112 return match;
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800113}
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800114
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700115extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
Wu Fengguangd3242362009-12-16 12:19:59 +0100116
Johannes Weiner0030f532012-07-31 16:45:25 -0700117extern void
118mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
119 struct mem_cgroup **memcgp);
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700120extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
Daisuke Nishimura50de1dd2011-01-13 15:47:43 -0800121 struct page *oldpage, struct page *newpage, bool migration_ok);
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800122
Andrew Morton694fbc02013-09-24 15:27:37 -0700123struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
124 struct mem_cgroup *,
125 struct mem_cgroup_reclaim_cookie *);
Johannes Weiner56600482012-01-12 17:17:59 -0800126void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
127
KAMEZAWA Hiroyuki58ae83d2008-02-07 00:14:32 -0800128/*
129 * For memory reclaim.
130 */
Konstantin Khlebnikovc56d5c72012-05-29 15:07:00 -0700131int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec);
Ying Han889976d2011-05-26 16:25:33 -0700132int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
Hugh Dickins4d7dcca2012-05-29 15:07:08 -0700133unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700134void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
Balbir Singhe2224322009-04-02 16:57:39 -0700135extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
136 struct task_struct *p);
KAMEZAWA Hiroyukiab936cb2012-01-12 17:17:44 -0800137extern void mem_cgroup_replace_page_cache(struct page *oldpage,
138 struct page *newpage);
KAMEZAWA Hiroyuki58ae83d2008-02-07 00:14:32 -0800139
Johannes Weiner49426422013-10-16 13:46:59 -0700140static inline void mem_cgroup_oom_enable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700141{
Johannes Weiner49426422013-10-16 13:46:59 -0700142 WARN_ON(current->memcg_oom.may_oom);
143 current->memcg_oom.may_oom = 1;
Johannes Weiner519e5242013-09-12 15:13:42 -0700144}
145
Johannes Weiner49426422013-10-16 13:46:59 -0700146static inline void mem_cgroup_oom_disable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700147{
Johannes Weiner49426422013-10-16 13:46:59 -0700148 WARN_ON(!current->memcg_oom.may_oom);
149 current->memcg_oom.may_oom = 0;
Johannes Weiner519e5242013-09-12 15:13:42 -0700150}
151
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700152static inline bool task_in_memcg_oom(struct task_struct *p)
153{
Johannes Weiner49426422013-10-16 13:46:59 -0700154 return p->memcg_oom.memcg;
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700155}
156
Johannes Weiner49426422013-10-16 13:46:59 -0700157bool mem_cgroup_oom_synchronize(bool wait);
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700158
Andrew Mortonc255a452012-07-31 16:43:02 -0700159#ifdef CONFIG_MEMCG_SWAP
KAMEZAWA Hiroyukic0777192009-01-07 18:07:57 -0800160extern int do_swap_account;
161#endif
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800162
163static inline bool mem_cgroup_disabled(void)
164{
165 if (mem_cgroup_subsys.disabled)
166 return true;
167 return false;
168}
169
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700170void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked,
171 unsigned long *flags);
172
KAMEZAWA Hiroyuki4331f7d2012-03-21 16:34:26 -0700173extern atomic_t memcg_moving;
174
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700175static inline void mem_cgroup_begin_update_page_stat(struct page *page,
176 bool *locked, unsigned long *flags)
177{
178 if (mem_cgroup_disabled())
179 return;
180 rcu_read_lock();
181 *locked = false;
KAMEZAWA Hiroyuki4331f7d2012-03-21 16:34:26 -0700182 if (atomic_read(&memcg_moving))
183 __mem_cgroup_begin_update_page_stat(page, locked, flags);
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700184}
185
186void __mem_cgroup_end_update_page_stat(struct page *page,
187 unsigned long *flags);
188static inline void mem_cgroup_end_update_page_stat(struct page *page,
189 bool *locked, unsigned long *flags)
190{
191 if (mem_cgroup_disabled())
192 return;
193 if (*locked)
194 __mem_cgroup_end_update_page_stat(page, flags);
195 rcu_read_unlock();
196}
197
Greg Thelen2a7106f2011-01-13 15:47:37 -0800198void mem_cgroup_update_page_stat(struct page *page,
Sha Zhengju68b48762013-09-12 15:13:50 -0700199 enum mem_cgroup_stat_index idx,
Greg Thelen2a7106f2011-01-13 15:47:37 -0800200 int val);
201
202static inline void mem_cgroup_inc_page_stat(struct page *page,
Sha Zhengju68b48762013-09-12 15:13:50 -0700203 enum mem_cgroup_stat_index idx)
Greg Thelen2a7106f2011-01-13 15:47:37 -0800204{
205 mem_cgroup_update_page_stat(page, idx, 1);
206}
207
208static inline void mem_cgroup_dec_page_stat(struct page *page,
Sha Zhengju68b48762013-09-12 15:13:50 -0700209 enum mem_cgroup_stat_index idx)
Greg Thelen2a7106f2011-01-13 15:47:37 -0800210{
211 mem_cgroup_update_page_stat(page, idx, -1);
212}
213
Andrew Morton0608f432013-09-24 15:27:41 -0700214unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
215 gfp_t gfp_mask,
216 unsigned long *total_scanned);
David Rientjesa63d83f2010-08-09 17:19:46 -0700217
David Rientjes68ae5642012-12-12 13:51:57 -0800218void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
219static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
220 enum vm_event_item idx)
221{
222 if (mem_cgroup_disabled())
223 return;
224 __mem_cgroup_count_vm_event(mm, idx);
225}
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800226#ifdef CONFIG_TRANSPARENT_HUGEPAGE
KAMEZAWA Hiroyukie94c8a92012-01-12 17:18:20 -0800227void mem_cgroup_split_huge_fixup(struct page *head);
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800228#endif
229
Daisuke Nishimuraf212ad72011-03-23 16:42:25 -0700230#ifdef CONFIG_DEBUG_VM
231bool mem_cgroup_bad_page_check(struct page *page);
232void mem_cgroup_print_bad_page(struct page *page);
233#endif
Andrew Mortonc255a452012-07-31 16:43:02 -0700234#else /* CONFIG_MEMCG */
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800235struct mem_cgroup;
236
237static inline int mem_cgroup_newpage_charge(struct page *page,
Hugh Dickins82895462008-03-04 14:29:08 -0800238 struct mm_struct *mm, gfp_t gfp_mask)
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800239{
240 return 0;
241}
242
Hugh Dickins82895462008-03-04 14:29:08 -0800243static inline int mem_cgroup_cache_charge(struct page *page,
244 struct mm_struct *mm, gfp_t gfp_mask)
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800245{
Hugh Dickins82895462008-03-04 14:29:08 -0800246 return 0;
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800247}
248
KAMEZAWA Hiroyuki8c7c6e342009-01-07 18:08:00 -0800249static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
Johannes Weiner72835c82012-01-12 17:18:32 -0800250 struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800251{
252 return 0;
253}
254
255static inline void mem_cgroup_commit_charge_swapin(struct page *page,
Johannes Weiner72835c82012-01-12 17:18:32 -0800256 struct mem_cgroup *memcg)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800257{
258}
259
Johannes Weiner72835c82012-01-12 17:18:32 -0800260static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800261{
262}
263
KAMEZAWA Hiroyuki569b8462009-12-15 16:47:03 -0800264static inline void mem_cgroup_uncharge_start(void)
265{
266}
267
268static inline void mem_cgroup_uncharge_end(void)
269{
270}
271
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800272static inline void mem_cgroup_uncharge_page(struct page *page)
273{
274}
275
KAMEZAWA Hiroyuki69029cd2008-07-25 01:47:14 -0700276static inline void mem_cgroup_uncharge_cache_page(struct page *page)
277{
278}
279
Johannes Weiner925b7672012-01-12 17:18:15 -0800280static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
281 struct mem_cgroup *memcg)
282{
283 return &zone->lruvec;
284}
285
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700286static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
287 struct zone *zone)
Minchan Kim3f58a822011-03-22 16:32:53 -0700288{
Johannes Weiner925b7672012-01-12 17:18:15 -0800289 return &zone->lruvec;
Balbir Singh66e17072008-02-07 00:13:56 -0800290}
291
Wu Fengguange42d9d52009-12-16 12:19:59 +0100292static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
293{
294 return NULL;
295}
296
KOSAKI Motohiroa4336582011-06-15 15:08:13 -0700297static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
298{
299 return NULL;
300}
301
Johannes Weiner587af302012-10-08 16:34:12 -0700302static inline bool mm_match_cgroup(struct mm_struct *mm,
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700303 struct mem_cgroup *memcg)
Balbir Singhbed71612008-02-07 00:14:01 -0800304{
Johannes Weiner587af302012-10-08 16:34:12 -0700305 return true;
Balbir Singhbed71612008-02-07 00:14:01 -0800306}
307
David Rientjesffbdccf2013-07-03 15:01:23 -0700308static inline bool task_in_mem_cgroup(struct task_struct *task,
309 const struct mem_cgroup *memcg)
David Rientjes4c4a2212008-02-07 00:14:06 -0800310{
David Rientjesffbdccf2013-07-03 15:01:23 -0700311 return true;
David Rientjes4c4a2212008-02-07 00:14:06 -0800312}
313
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700314static inline struct cgroup_subsys_state
315 *mem_cgroup_css(struct mem_cgroup *memcg)
Wu Fengguangd3242362009-12-16 12:19:59 +0100316{
317 return NULL;
318}
319
Johannes Weiner0030f532012-07-31 16:45:25 -0700320static inline void
akpm@linux-foundation.orgac39cf82010-05-26 14:42:46 -0700321mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
Johannes Weiner0030f532012-07-31 16:45:25 -0700322 struct mem_cgroup **memcgp)
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800323{
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800324}
325
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700326static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
Daisuke Nishimura50de1dd2011-01-13 15:47:43 -0800327 struct page *oldpage, struct page *newpage, bool migration_ok)
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800328{
329}
330
Johannes Weiner56600482012-01-12 17:17:59 -0800331static inline struct mem_cgroup *
332mem_cgroup_iter(struct mem_cgroup *root,
333 struct mem_cgroup *prev,
334 struct mem_cgroup_reclaim_cookie *reclaim)
335{
336 return NULL;
337}
338
339static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
340 struct mem_cgroup *prev)
341{
342}
343
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800344static inline bool mem_cgroup_disabled(void)
345{
346 return true;
347}
KAMEZAWA Hiroyukia636b322009-01-07 18:08:08 -0800348
KOSAKI Motohiro14797e22009-01-07 18:08:18 -0800349static inline int
Konstantin Khlebnikovc56d5c72012-05-29 15:07:00 -0700350mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
KOSAKI Motohiro14797e22009-01-07 18:08:18 -0800351{
352 return 1;
353}
354
KOSAKI Motohiroa3d8e052009-01-07 18:08:19 -0800355static inline unsigned long
Hugh Dickins4d7dcca2012-05-29 15:07:08 -0700356mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
KOSAKI Motohiroa3d8e052009-01-07 18:08:19 -0800357{
358 return 0;
359}
360
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700361static inline void
362mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
363 int increment)
KOSAKI Motohiro3e2f41f2009-01-07 18:08:20 -0800364{
KOSAKI Motohiro3e2f41f2009-01-07 18:08:20 -0800365}
366
Balbir Singhe2224322009-04-02 16:57:39 -0700367static inline void
368mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
369{
370}
371
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700372static inline void mem_cgroup_begin_update_page_stat(struct page *page,
373 bool *locked, unsigned long *flags)
374{
375}
376
377static inline void mem_cgroup_end_update_page_stat(struct page *page,
378 bool *locked, unsigned long *flags)
379{
380}
381
Johannes Weiner49426422013-10-16 13:46:59 -0700382static inline void mem_cgroup_oom_enable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700383{
384}
385
Johannes Weiner49426422013-10-16 13:46:59 -0700386static inline void mem_cgroup_oom_disable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700387{
388}
389
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700390static inline bool task_in_memcg_oom(struct task_struct *p)
391{
392 return false;
393}
394
Johannes Weiner49426422013-10-16 13:46:59 -0700395static inline bool mem_cgroup_oom_synchronize(bool wait)
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700396{
397 return false;
398}
399
Greg Thelen2a7106f2011-01-13 15:47:37 -0800400static inline void mem_cgroup_inc_page_stat(struct page *page,
Sha Zhengju68b48762013-09-12 15:13:50 -0700401 enum mem_cgroup_stat_index idx)
Greg Thelen2a7106f2011-01-13 15:47:37 -0800402{
403}
404
405static inline void mem_cgroup_dec_page_stat(struct page *page,
Sha Zhengju68b48762013-09-12 15:13:50 -0700406 enum mem_cgroup_stat_index idx)
Balbir Singhd69b0422009-06-17 16:26:34 -0700407{
408}
409
Balbir Singh4e416952009-09-23 15:56:39 -0700410static inline
Andrew Morton0608f432013-09-24 15:27:41 -0700411unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
412 gfp_t gfp_mask,
413 unsigned long *total_scanned)
Balbir Singh4e416952009-09-23 15:56:39 -0700414{
Andrew Morton0608f432013-09-24 15:27:41 -0700415 return 0;
Balbir Singh4e416952009-09-23 15:56:39 -0700416}
417
KAMEZAWA Hiroyukie94c8a92012-01-12 17:18:20 -0800418static inline void mem_cgroup_split_huge_fixup(struct page *head)
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800419{
420}
421
Ying Han456f9982011-05-26 16:25:38 -0700422static inline
423void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
424{
425}
KAMEZAWA Hiroyukiab936cb2012-01-12 17:17:44 -0800426static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
427 struct page *newpage)
428{
429}
Andrew Mortonc255a452012-07-31 16:43:02 -0700430#endif /* CONFIG_MEMCG */
Pavel Emelianov78fb7462008-02-07 00:13:51 -0800431
Andrew Mortonc255a452012-07-31 16:43:02 -0700432#if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM)
Daisuke Nishimuraf212ad72011-03-23 16:42:25 -0700433static inline bool
434mem_cgroup_bad_page_check(struct page *page)
435{
436 return false;
437}
438
439static inline void
440mem_cgroup_print_bad_page(struct page *page)
441{
442}
443#endif
444
Glauber Costae1aab162011-12-11 21:47:03 +0000445enum {
446 UNDER_LIMIT,
447 SOFT_LIMIT,
448 OVER_LIMIT,
449};
450
451struct sock;
David Rientjescd590852012-10-10 15:54:08 -0700452#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
Glauber Costae1aab162011-12-11 21:47:03 +0000453void sock_update_memcg(struct sock *sk);
454void sock_release_memcg(struct sock *sk);
455#else
456static inline void sock_update_memcg(struct sock *sk)
457{
458}
459static inline void sock_release_memcg(struct sock *sk)
460{
461}
David Rientjescd590852012-10-10 15:54:08 -0700462#endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800463
464#ifdef CONFIG_MEMCG_KMEM
Glauber Costaa8964b92012-12-18 14:22:09 -0800465extern struct static_key memcg_kmem_enabled_key;
Glauber Costa749c5412012-12-18 14:23:01 -0800466
467extern int memcg_limited_groups_array_size;
Glauber Costaebe945c2012-12-18 14:23:10 -0800468
469/*
470 * Helper macro to loop through all memcg-specific caches. Callers must still
471 * check if the cache is valid (it is either valid or NULL).
472 * the slab_mutex must be held when looping through those caches
473 */
Glauber Costa749c5412012-12-18 14:23:01 -0800474#define for_each_memcg_cache_index(_idx) \
Glauber Costa91c777d2013-02-04 14:28:49 -0800475 for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++)
Glauber Costa749c5412012-12-18 14:23:01 -0800476
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800477static inline bool memcg_kmem_enabled(void)
478{
Glauber Costaa8964b92012-12-18 14:22:09 -0800479 return static_key_false(&memcg_kmem_enabled_key);
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800480}
481
482/*
483 * In general, we'll do everything in our power to not incur in any overhead
484 * for non-memcg users for the kmem functions. Not even a function call, if we
485 * can avoid it.
486 *
487 * Therefore, we'll inline all those functions so that in the best case, we'll
488 * see that kmemcg is off for everybody and proceed quickly. If it is on,
489 * we'll still do most of the flag checking inline. We check a lot of
490 * conditions, but because they are pretty simple, they are expected to be
491 * fast.
492 */
493bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
494 int order);
495void __memcg_kmem_commit_charge(struct page *page,
496 struct mem_cgroup *memcg, int order);
497void __memcg_kmem_uncharge_pages(struct page *page, int order);
498
Glauber Costa2633d7a2012-12-18 14:22:34 -0800499int memcg_cache_id(struct mem_cgroup *memcg);
Vladimir Davydov363a0442014-01-23 15:52:56 -0800500int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
501 struct kmem_cache *root_cache);
502void memcg_free_cache_params(struct kmem_cache *s);
Vladimir Davydov1aa13252014-01-23 15:52:58 -0800503void memcg_register_cache(struct kmem_cache *s);
504void memcg_unregister_cache(struct kmem_cache *s);
Glauber Costa2633d7a2012-12-18 14:22:34 -0800505
Glauber Costa55007d82012-12-18 14:22:38 -0800506int memcg_update_cache_size(struct kmem_cache *s, int num_groups);
507void memcg_update_array_size(int num_groups);
Glauber Costad7f25f82012-12-18 14:22:40 -0800508
509struct kmem_cache *
510__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);
511
Glauber Costa1f458cb2012-12-18 14:22:50 -0800512void mem_cgroup_destroy_cache(struct kmem_cache *cachep);
Glauber Costa7cf27982012-12-18 14:22:55 -0800513void kmem_cache_destroy_memcg_children(struct kmem_cache *s);
Glauber Costa1f458cb2012-12-18 14:22:50 -0800514
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800515/**
516 * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
517 * @gfp: the gfp allocation flags.
518 * @memcg: a pointer to the memcg this was charged against.
519 * @order: allocation order.
520 *
521 * returns true if the memcg where the current task belongs can hold this
522 * allocation.
523 *
524 * We return true automatically if this allocation is not to be accounted to
525 * any memcg.
526 */
527static inline bool
528memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
529{
530 if (!memcg_kmem_enabled())
531 return true;
532
533 /*
534 * __GFP_NOFAIL allocations will move on even if charging is not
535 * possible. Therefore we don't even try, and have this allocation
536 * unaccounted. We could in theory charge it with
537 * res_counter_charge_nofail, but we hope those allocations are rare,
538 * and won't be worth the trouble.
539 */
540 if (!(gfp & __GFP_KMEMCG) || (gfp & __GFP_NOFAIL))
541 return true;
542 if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
543 return true;
544
545 /* If the test is dying, just let it go. */
546 if (unlikely(fatal_signal_pending(current)))
547 return true;
548
549 return __memcg_kmem_newpage_charge(gfp, memcg, order);
550}
551
552/**
553 * memcg_kmem_uncharge_pages: uncharge pages from memcg
554 * @page: pointer to struct page being freed
555 * @order: allocation order.
556 *
557 * there is no need to specify memcg here, since it is embedded in page_cgroup
558 */
559static inline void
560memcg_kmem_uncharge_pages(struct page *page, int order)
561{
562 if (memcg_kmem_enabled())
563 __memcg_kmem_uncharge_pages(page, order);
564}
565
566/**
567 * memcg_kmem_commit_charge: embeds correct memcg in a page
568 * @page: pointer to struct page recently allocated
569 * @memcg: the memcg structure we charged against
570 * @order: allocation order.
571 *
572 * Needs to be called after memcg_kmem_newpage_charge, regardless of success or
573 * failure of the allocation. if @page is NULL, this function will revert the
574 * charges. Otherwise, it will commit the memcg given by @memcg to the
575 * corresponding page_cgroup.
576 */
577static inline void
578memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
579{
580 if (memcg_kmem_enabled() && memcg)
581 __memcg_kmem_commit_charge(page, memcg, order);
582}
583
Glauber Costad7f25f82012-12-18 14:22:40 -0800584/**
585 * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation
586 * @cachep: the original global kmem cache
587 * @gfp: allocation flags.
588 *
589 * This function assumes that the task allocating, which determines the memcg
590 * in the page allocator, belongs to the same cgroup throughout the whole
591 * process. Misacounting can happen if the task calls memcg_kmem_get_cache()
592 * while belonging to a cgroup, and later on changes. This is considered
593 * acceptable, and should only happen upon task migration.
594 *
595 * Before the cache is created by the memcg core, there is also a possible
596 * imbalance: the task belongs to a memcg, but the cache being allocated from
597 * is the global cache, since the child cache is not yet guaranteed to be
598 * ready. This case is also fine, since in this case the GFP_KMEMCG will not be
599 * passed and the page allocator will not attempt any cgroup accounting.
600 */
601static __always_inline struct kmem_cache *
602memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
603{
604 if (!memcg_kmem_enabled())
605 return cachep;
606 if (gfp & __GFP_NOFAIL)
607 return cachep;
608 if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
609 return cachep;
610 if (unlikely(fatal_signal_pending(current)))
611 return cachep;
612
613 return __memcg_kmem_get_cache(cachep, gfp);
614}
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800615#else
Glauber Costa749c5412012-12-18 14:23:01 -0800616#define for_each_memcg_cache_index(_idx) \
617 for (; NULL; )
618
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800619static inline bool memcg_kmem_enabled(void)
620{
621 return false;
622}
623
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800624static inline bool
625memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
626{
627 return true;
628}
629
630static inline void memcg_kmem_uncharge_pages(struct page *page, int order)
631{
632}
633
634static inline void
635memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
636{
637}
Glauber Costa2633d7a2012-12-18 14:22:34 -0800638
639static inline int memcg_cache_id(struct mem_cgroup *memcg)
640{
641 return -1;
642}
643
Vladimir Davydov363a0442014-01-23 15:52:56 -0800644static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg,
645 struct kmem_cache *s, struct kmem_cache *root_cache)
Glauber Costa2633d7a2012-12-18 14:22:34 -0800646{
647 return 0;
648}
649
Vladimir Davydov363a0442014-01-23 15:52:56 -0800650static inline void memcg_free_cache_params(struct kmem_cache *s)
651{
652}
653
Vladimir Davydov1aa13252014-01-23 15:52:58 -0800654static inline void memcg_register_cache(struct kmem_cache *s)
Glauber Costa2633d7a2012-12-18 14:22:34 -0800655{
656}
657
Vladimir Davydov1aa13252014-01-23 15:52:58 -0800658static inline void memcg_unregister_cache(struct kmem_cache *s)
Glauber Costa2633d7a2012-12-18 14:22:34 -0800659{
660}
Glauber Costad7f25f82012-12-18 14:22:40 -0800661
662static inline struct kmem_cache *
663memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
664{
665 return cachep;
666}
Glauber Costa7cf27982012-12-18 14:22:55 -0800667
668static inline void kmem_cache_destroy_memcg_children(struct kmem_cache *s)
669{
670}
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800671#endif /* CONFIG_MEMCG_KMEM */
Balbir Singh8cdea7c2008-02-07 00:13:50 -0800672#endif /* _LINUX_MEMCONTROL_H */
673