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1/* memcontrol.h - Memory Controller
2 *
3 * Copyright IBM Corporation, 2007
4 * Author Balbir Singh <balbir@linux.vnet.ibm.com>
5 *
6 * Copyright 2007 OpenVZ SWsoft Inc
7 * Author: Pavel Emelianov <xemul@openvz.org>
8 *
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.
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
22#include <linux/cgroup.h>
23struct mem_cgroup;
24struct page_cgroup;
25struct page;
26struct mm_struct;
27
28#ifdef CONFIG_CGROUP_MEM_RES_CTLR
29/*
30 * All "charge" functions with gfp_mask should use GFP_KERNEL or
31 * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
32 * alloc memory but reclaims memory from all available zones. So, "where I want
33 * memory from" bits of gfp_mask has no meaning. So any bits of that field is
34 * available but adding a rule is better. charge functions' gfp_mask should
35 * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
36 * codes.
37 * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
38 */
39
40extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
41 gfp_t gfp_mask);
42/* for swap handling */
43extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
44 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
45extern void mem_cgroup_commit_charge_swapin(struct page *page,
46 struct mem_cgroup *ptr);
47extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
48
49extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
50 gfp_t gfp_mask);
51extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
52extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
53extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
54extern void mem_cgroup_del_lru(struct page *page);
55extern void mem_cgroup_move_lists(struct page *page,
56 enum lru_list from, enum lru_list to);
57
58/* For coalescing uncharge for reducing memcg' overhead*/
59extern void mem_cgroup_uncharge_start(void);
60extern void mem_cgroup_uncharge_end(void);
61
62extern void mem_cgroup_uncharge_page(struct page *page);
63extern void mem_cgroup_uncharge_cache_page(struct page *page);
64extern int mem_cgroup_shmem_charge_fallback(struct page *page,
65 struct mm_struct *mm, gfp_t gfp_mask);
66
67extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
68 struct list_head *dst,
69 unsigned long *scanned, int order,
70 int mode, struct zone *z,
71 struct mem_cgroup *mem_cont,
72 int active, int file);
73extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
74int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
75
76extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
77extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
78
79static inline
80int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
81{
82 struct mem_cgroup *mem;
83 rcu_read_lock();
84 mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
85 rcu_read_unlock();
86 return cgroup == mem;
87}
88
89extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
90
91extern int
92mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
93extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
94 struct page *oldpage, struct page *newpage);
95
96/*
97 * For memory reclaim.
98 */
99extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
100extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
101 int priority);
102extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
103 int priority);
104int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
105int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
106unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
107 struct zone *zone,
108 enum lru_list lru);
109struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
110 struct zone *zone);
111struct zone_reclaim_stat*
112mem_cgroup_get_reclaim_stat_from_page(struct page *page);
113extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
114 struct task_struct *p);
115
116#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
117extern int do_swap_account;
118#endif
119
120static inline bool mem_cgroup_disabled(void)
121{
122 if (mem_cgroup_subsys.disabled)
123 return true;
124 return false;
125}
126
127extern bool mem_cgroup_oom_called(struct task_struct *task);
128void mem_cgroup_update_file_mapped(struct page *page, int val);
129unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
130 gfp_t gfp_mask, int nid,
131 int zid);
132#else /* CONFIG_CGROUP_MEM_RES_CTLR */
133struct mem_cgroup;
134
135static inline int mem_cgroup_newpage_charge(struct page *page,
136 struct mm_struct *mm, gfp_t gfp_mask)
137{
138 return 0;
139}
140
141static inline int mem_cgroup_cache_charge(struct page *page,
142 struct mm_struct *mm, gfp_t gfp_mask)
143{
144 return 0;
145}
146
147static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
148 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
149{
150 return 0;
151}
152
153static inline void mem_cgroup_commit_charge_swapin(struct page *page,
154 struct mem_cgroup *ptr)
155{
156}
157
158static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
159{
160}
161
162static inline void mem_cgroup_uncharge_start(void)
163{
164}
165
166static inline void mem_cgroup_uncharge_end(void)
167{
168}
169
170static inline void mem_cgroup_uncharge_page(struct page *page)
171{
172}
173
174static inline void mem_cgroup_uncharge_cache_page(struct page *page)
175{
176}
177
178static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
179 struct mm_struct *mm, gfp_t gfp_mask)
180{
181 return 0;
182}
183
184static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
185{
186}
187
188static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
189{
190 return ;
191}
192
193static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
194{
195 return ;
196}
197
198static inline void mem_cgroup_del_lru(struct page *page)
199{
200 return ;
201}
202
203static inline void
204mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
205{
206}
207
208static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
209{
210 return NULL;
211}
212
213static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
214{
215 return 1;
216}
217
218static inline int task_in_mem_cgroup(struct task_struct *task,
219 const struct mem_cgroup *mem)
220{
221 return 1;
222}
223
224static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
225{
226 return NULL;
227}
228
229static inline int
230mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
231{
232 return 0;
233}
234
235static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
236 struct page *oldpage,
237 struct page *newpage)
238{
239}
240
241static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
242{
243 return 0;
244}
245
246static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
247 int priority)
248{
249}
250
251static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
252 int priority)
253{
254}
255
256static inline bool mem_cgroup_disabled(void)
257{
258 return true;
259}
260
261static inline bool mem_cgroup_oom_called(struct task_struct *task)
262{
263 return false;
264}
265
266static inline int
267mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
268{
269 return 1;
270}
271
272static inline int
273mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
274{
275 return 1;
276}
277
278static inline unsigned long
279mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
280 enum lru_list lru)
281{
282 return 0;
283}
284
285
286static inline struct zone_reclaim_stat*
287mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
288{
289 return NULL;
290}
291
292static inline struct zone_reclaim_stat*
293mem_cgroup_get_reclaim_stat_from_page(struct page *page)
294{
295 return NULL;
296}
297
298static inline void
299mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
300{
301}
302
303static inline void mem_cgroup_update_file_mapped(struct page *page,
304 int val)
305{
306}
307
308static inline
309unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
310 gfp_t gfp_mask, int nid, int zid)
311{
312 return 0;
313}
314
315#endif /* CONFIG_CGROUP_MEM_CONT */
316
317#endif /* _LINUX_MEMCONTROL_H */
318