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>
23 struct mem_cgroup;
24 struct page_cgroup;
25 struct page;
26 struct 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
40 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
41 gfp_t gfp_mask);
42 /* for swap handling */
43 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
44 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
45 extern void mem_cgroup_commit_charge_swapin(struct page *page,
46 struct mem_cgroup *ptr);
47 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
48
49 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
50 gfp_t gfp_mask);
51 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
52 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
53 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
54 extern void mem_cgroup_del_lru(struct page *page);
55 extern void mem_cgroup_move_lists(struct page *page,
56 enum lru_list from, enum lru_list to);
57 extern void mem_cgroup_uncharge_page(struct page *page);
58 extern void mem_cgroup_uncharge_cache_page(struct page *page);
59 extern int mem_cgroup_shmem_charge_fallback(struct page *page,
60 struct mm_struct *mm, gfp_t gfp_mask);
61
62 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
63 struct list_head *dst,
64 unsigned long *scanned, int order,
65 int mode, struct zone *z,
66 struct mem_cgroup *mem_cont,
67 int active, int file);
68 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
69 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
70
71 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
72
73 static inline
74 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
75 {
76 struct mem_cgroup *mem;
77 rcu_read_lock();
78 mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
79 rcu_read_unlock();
80 return cgroup == mem;
81 }
82
83 extern int
84 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
85 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
86 struct page *oldpage, struct page *newpage);
87
88 /*
89 * For memory reclaim.
90 */
91 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
92 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
93 int priority);
94 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
95 int priority);
96 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
97 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
98 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
99 struct zone *zone,
100 enum lru_list lru);
101 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
102 struct zone *zone);
103 struct zone_reclaim_stat*
104 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
105 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
106 struct task_struct *p);
107
108 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
109 extern int do_swap_account;
110 #endif
111
112 static inline bool mem_cgroup_disabled(void)
113 {
114 if (mem_cgroup_subsys.disabled)
115 return true;
116 return false;
117 }
118
119 extern bool mem_cgroup_oom_called(struct task_struct *task);
120 void mem_cgroup_update_mapped_file_stat(struct page *page, int val);
121 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
122 struct mem_cgroup;
123
124 static inline int mem_cgroup_newpage_charge(struct page *page,
125 struct mm_struct *mm, gfp_t gfp_mask)
126 {
127 return 0;
128 }
129
130 static inline int mem_cgroup_cache_charge(struct page *page,
131 struct mm_struct *mm, gfp_t gfp_mask)
132 {
133 return 0;
134 }
135
136 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
137 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
138 {
139 return 0;
140 }
141
142 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
143 struct mem_cgroup *ptr)
144 {
145 }
146
147 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
148 {
149 }
150
151 static inline void mem_cgroup_uncharge_page(struct page *page)
152 {
153 }
154
155 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
156 {
157 }
158
159 static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
160 struct mm_struct *mm, gfp_t gfp_mask)
161 {
162 return 0;
163 }
164
165 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
166 {
167 }
168
169 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
170 {
171 return ;
172 }
173
174 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
175 {
176 return ;
177 }
178
179 static inline void mem_cgroup_del_lru(struct page *page)
180 {
181 return ;
182 }
183
184 static inline void
185 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
186 {
187 }
188
189 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
190 {
191 return 1;
192 }
193
194 static inline int task_in_mem_cgroup(struct task_struct *task,
195 const struct mem_cgroup *mem)
196 {
197 return 1;
198 }
199
200 static inline int
201 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
202 {
203 return 0;
204 }
205
206 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
207 struct page *oldpage,
208 struct page *newpage)
209 {
210 }
211
212 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
213 {
214 return 0;
215 }
216
217 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
218 int priority)
219 {
220 }
221
222 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
223 int priority)
224 {
225 }
226
227 static inline bool mem_cgroup_disabled(void)
228 {
229 return true;
230 }
231
232 static inline bool mem_cgroup_oom_called(struct task_struct *task)
233 {
234 return false;
235 }
236
237 static inline int
238 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
239 {
240 return 1;
241 }
242
243 static inline int
244 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
245 {
246 return 1;
247 }
248
249 static inline unsigned long
250 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
251 enum lru_list lru)
252 {
253 return 0;
254 }
255
256
257 static inline struct zone_reclaim_stat*
258 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
259 {
260 return NULL;
261 }
262
263 static inline struct zone_reclaim_stat*
264 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
265 {
266 return NULL;
267 }
268
269 static inline void
270 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
271 {
272 }
273
274 static inline void mem_cgroup_update_mapped_file_stat(struct page *page,
275 int val)
276 {
277 }
278
279 #endif /* CONFIG_CGROUP_MEM_CONT */
280
281 #endif /* _LINUX_MEMCONTROL_H */
282
283
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