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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
127void mem_cgroup_update_file_mapped(struct page *page, int val);
128unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
129 gfp_t gfp_mask, int nid,
130 int zid);
131#else /* CONFIG_CGROUP_MEM_RES_CTLR */
132struct mem_cgroup;
133
134static inline int mem_cgroup_newpage_charge(struct page *page,
135 struct mm_struct *mm, gfp_t gfp_mask)
136{
137 return 0;
138}
139
140static inline int mem_cgroup_cache_charge(struct page *page,
141 struct mm_struct *mm, gfp_t gfp_mask)
142{
143 return 0;
144}
145
146static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
147 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
148{
149 return 0;
150}
151
152static inline void mem_cgroup_commit_charge_swapin(struct page *page,
153 struct mem_cgroup *ptr)
154{
155}
156
157static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
158{
159}
160
161static inline void mem_cgroup_uncharge_start(void)
162{
163}
164
165static inline void mem_cgroup_uncharge_end(void)
166{
167}
168
169static inline void mem_cgroup_uncharge_page(struct page *page)
170{
171}
172
173static inline void mem_cgroup_uncharge_cache_page(struct page *page)
174{
175}
176
177static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
178 struct mm_struct *mm, gfp_t gfp_mask)
179{
180 return 0;
181}
182
183static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
184{
185}
186
187static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
188{
189 return ;
190}
191
192static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
193{
194 return ;
195}
196
197static inline void mem_cgroup_del_lru(struct page *page)
198{
199 return ;
200}
201
202static inline void
203mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
204{
205}
206
207static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
208{
209 return NULL;
210}
211
212static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
213{
214 return 1;
215}
216
217static inline int task_in_mem_cgroup(struct task_struct *task,
218 const struct mem_cgroup *mem)
219{
220 return 1;
221}
222
223static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
224{
225 return NULL;
226}
227
228static inline int
229mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
230{
231 return 0;
232}
233
234static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
235 struct page *oldpage,
236 struct page *newpage)
237{
238}
239
240static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
241{
242 return 0;
243}
244
245static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
246 int priority)
247{
248}
249
250static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
251 int priority)
252{
253}
254
255static inline bool mem_cgroup_disabled(void)
256{
257 return true;
258}
259
260static inline int
261mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
262{
263 return 1;
264}
265
266static inline int
267mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
268{
269 return 1;
270}
271
272static inline unsigned long
273mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
274 enum lru_list lru)
275{
276 return 0;
277}
278
279
280static inline struct zone_reclaim_stat*
281mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
282{
283 return NULL;
284}
285
286static inline struct zone_reclaim_stat*
287mem_cgroup_get_reclaim_stat_from_page(struct page *page)
288{
289 return NULL;
290}
291
292static inline void
293mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
294{
295}
296
297static inline void mem_cgroup_update_file_mapped(struct page *page,
298 int val)
299{
300}
301
302static inline
303unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
304 gfp_t gfp_mask, int nid, int zid)
305{
306 return 0;
307}
308
309#endif /* CONFIG_CGROUP_MEM_CONT */
310
311#endif /* _LINUX_MEMCONTROL_H */
312