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