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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);
57extern void mem_cgroup_uncharge_page(struct page *page);
58extern void mem_cgroup_uncharge_cache_page(struct page *page);
59extern int mem_cgroup_shmem_charge_fallback(struct page *page,
60 struct mm_struct *mm, gfp_t gfp_mask);
61
62extern 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);
68extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
69int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
70
71extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
72
73static inline
74int 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
83extern int
84mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
85extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
86 struct page *oldpage, struct page *newpage);
87
88/*
89 * For memory reclaim.
90 */
91extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
92extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
93 int priority);
94extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
95 int priority);
96int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
97unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
98 struct zone *zone,
99 enum lru_list lru);
100struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
101 struct zone *zone);
102struct zone_reclaim_stat*
103mem_cgroup_get_reclaim_stat_from_page(struct page *page);
104extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
105 struct task_struct *p);
106
107#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
108extern int do_swap_account;
109#endif
110
111static inline bool mem_cgroup_disabled(void)
112{
113 if (mem_cgroup_subsys.disabled)
114 return true;
115 return false;
116}
117
118extern bool mem_cgroup_oom_called(struct task_struct *task);
119
120#else /* CONFIG_CGROUP_MEM_RES_CTLR */
121struct mem_cgroup;
122
123static inline int mem_cgroup_newpage_charge(struct page *page,
124 struct mm_struct *mm, gfp_t gfp_mask)
125{
126 return 0;
127}
128
129static inline int mem_cgroup_cache_charge(struct page *page,
130 struct mm_struct *mm, gfp_t gfp_mask)
131{
132 return 0;
133}
134
135static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
136 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
137{
138 return 0;
139}
140
141static inline void mem_cgroup_commit_charge_swapin(struct page *page,
142 struct mem_cgroup *ptr)
143{
144}
145
146static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
147{
148}
149
150static inline void mem_cgroup_uncharge_page(struct page *page)
151{
152}
153
154static inline void mem_cgroup_uncharge_cache_page(struct page *page)
155{
156}
157
158static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
159 struct mm_struct *mm, gfp_t gfp_mask)
160{
161 return 0;
162}
163
164static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
165{
166}
167
168static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
169{
170 return ;
171}
172
173static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
174{
175 return ;
176}
177
178static inline void mem_cgroup_del_lru(struct page *page)
179{
180 return ;
181}
182
183static inline void
184mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
185{
186}
187
188static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
189{
190 return 1;
191}
192
193static inline int task_in_mem_cgroup(struct task_struct *task,
194 const struct mem_cgroup *mem)
195{
196 return 1;
197}
198
199static inline int
200mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
201{
202 return 0;
203}
204
205static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
206 struct page *oldpage,
207 struct page *newpage)
208{
209}
210
211static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
212{
213 return 0;
214}
215
216static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
217 int priority)
218{
219}
220
221static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
222 int priority)
223{
224}
225
226static inline bool mem_cgroup_disabled(void)
227{
228 return true;
229}
230
231static inline bool mem_cgroup_oom_called(struct task_struct *task)
232{
233 return false;
234}
235
236static inline int
237mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
238{
239 return 1;
240}
241
242static inline unsigned long
243mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
244 enum lru_list lru)
245{
246 return 0;
247}
248
249
250static inline struct zone_reclaim_stat*
251mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
252{
253 return NULL;
254}
255
256static inline struct zone_reclaim_stat*
257mem_cgroup_get_reclaim_stat_from_page(struct page *page)
258{
259 return NULL;
260}
261
262static inline void
263mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
264{
265}
266
267#endif /* CONFIG_CGROUP_MEM_CONT */
268
269#endif /* _LINUX_MEMCONTROL_H */
270