summaryrefslogtreecommitdiffstats
path: root/include/linux/memcontrol.h
blob: f944591765eba3be0904bc820c4063c3c73183fd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
/* memcontrol.h - Memory Controller
 *
 * Copyright IBM Corporation, 2007
 * Author Balbir Singh <balbir@linux.vnet.ibm.com>
 *
 * Copyright 2007 OpenVZ SWsoft Inc
 * Author: Pavel Emelianov <xemul@openvz.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef _LINUX_MEMCONTROL_H
#define _LINUX_MEMCONTROL_H
#include <linux/cgroup.h>
#include <linux/vm_event_item.h>

struct mem_cgroup;
struct page_cgroup;
struct page;
struct mm_struct;

/* Stats that can be updated by kernel. */
enum mem_cgroup_page_stat_item {
	MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
};

extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
					struct list_head *dst,
					unsigned long *scanned, int order,
					isolate_mode_t mode,
					struct zone *z,
					struct mem_cgroup *mem_cont,
					int active, int file);

#ifdef CONFIG_CGROUP_MEM_RES_CTLR
/*
 * All "charge" functions with gfp_mask should use GFP_KERNEL or
 * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
 * alloc memory but reclaims memory from all available zones. So, "where I want
 * memory from" bits of gfp_mask has no meaning. So any bits of that field is
 * available but adding a rule is better. charge functions' gfp_mask should
 * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
 * codes.
 * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
 */

extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
				gfp_t gfp_mask);
/* for swap handling */
extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
		struct page *page, gfp_t mask, struct mem_cgroup **ptr);
extern void mem_cgroup_commit_charge_swapin(struct page *page,
					struct mem_cgroup *ptr);
extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);

extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
					gfp_t gfp_mask);
extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
extern void mem_cgroup_rotate_reclaimable_page(struct page *page);
extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
extern void mem_cgroup_del_lru(struct page *page);
extern void mem_cgroup_move_lists(struct page *page,
				  enum lru_list from, enum lru_list to);

/* For coalescing uncharge for reducing memcg' overhead*/
extern void mem_cgroup_uncharge_start(void);
extern void mem_cgroup_uncharge_end(void);

extern void mem_cgroup_uncharge_page(struct page *page);
extern void mem_cgroup_uncharge_cache_page(struct page *page);

extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask);
int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg);

extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);

extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);

static inline
int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
{
	struct mem_cgroup *memcg;
	rcu_read_lock();
	memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner));
	rcu_read_unlock();
	return cgroup == memcg;
}

extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);

extern int
mem_cgroup_prepare_migration(struct page *page,
	struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask);
extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
	struct page *oldpage, struct page *newpage, bool migration_ok);

/*
 * For memory reclaim.
 */
int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg,
				    struct zone *zone);
int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg,
				    struct zone *zone);
int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
					int nid, int zid, unsigned int lrumask);
struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
						      struct zone *zone);
struct zone_reclaim_stat*
mem_cgroup_get_reclaim_stat_from_page(struct page *page);
extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
					struct task_struct *p);

#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
extern int do_swap_account;
#endif

static inline bool mem_cgroup_disabled(void)
{
	if (mem_cgroup_subsys.disabled)
		return true;
	return false;
}

void mem_cgroup_update_page_stat(struct page *page,
				 enum mem_cgroup_page_stat_item idx,
				 int val);

static inline void mem_cgroup_inc_page_stat(struct page *page,
					    enum mem_cgroup_page_stat_item idx)
{
	mem_cgroup_update_page_stat(page, idx, 1);
}

static inline void mem_cgroup_dec_page_stat(struct page *page,
					    enum mem_cgroup_page_stat_item idx)
{
	mem_cgroup_update_page_stat(page, idx, -1);
}

unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
						gfp_t gfp_mask,
						unsigned long *total_scanned);
u64 mem_cgroup_get_limit(struct mem_cgroup *memcg);

void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
#endif

#ifdef CONFIG_DEBUG_VM
bool mem_cgroup_bad_page_check(struct page *page);
void mem_cgroup_print_bad_page(struct page *page);
#endif
#else /* CONFIG_CGROUP_MEM_RES_CTLR */
struct mem_cgroup;

static inline int mem_cgroup_newpage_charge(struct page *page,
					struct mm_struct *mm, gfp_t gfp_mask)
{
	return 0;
}

static inline int mem_cgroup_cache_charge(struct page *page,
					struct mm_struct *mm, gfp_t gfp_mask)
{
	return 0;
}

static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
		struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
{
	return 0;
}

static inline void mem_cgroup_commit_charge_swapin(struct page *page,
					  struct mem_cgroup *ptr)
{
}

static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
{
}

static inline void mem_cgroup_uncharge_start(void)
{
}

static inline void mem_cgroup_uncharge_end(void)
{
}

static inline void mem_cgroup_uncharge_page(struct page *page)
{
}

static inline void mem_cgroup_uncharge_cache_page(struct page *page)
{
}

static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
{
}

static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
{
	return ;
}

static inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
{
	return ;
}

static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
{
	return ;
}

static inline void mem_cgroup_del_lru(struct page *page)
{
	return ;
}

static inline void
mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
{
}

static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
{
	return NULL;
}

static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
{
	return NULL;
}

static inline int mm_match_cgroup(struct mm_struct *mm,
		struct mem_cgroup *memcg)
{
	return 1;
}

static inline int task_in_mem_cgroup(struct task_struct *task,
				     const struct mem_cgroup *memcg)
{
	return 1;
}

static inline struct cgroup_subsys_state
		*mem_cgroup_css(struct mem_cgroup *memcg)
{
	return NULL;
}

static inline int
mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
	struct mem_cgroup **ptr, gfp_t gfp_mask)
{
	return 0;
}

static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
		struct page *oldpage, struct page *newpage, bool migration_ok)
{
}

static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *memcg)
{
	return 0;
}

static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *memcg,
						int priority)
{
}

static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *memcg,
						int priority)
{
}

static inline bool mem_cgroup_disabled(void)
{
	return true;
}

static inline int
mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
{
	return 1;
}

static inline int
mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
{
	return 1;
}

static inline unsigned long
mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
				unsigned int lru_mask)
{
	return 0;
}


static inline struct zone_reclaim_stat*
mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
{
	return NULL;
}

static inline struct zone_reclaim_stat*
mem_cgroup_get_reclaim_stat_from_page(struct page *page)
{
	return NULL;
}

static inline void
mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
{
}

static inline void mem_cgroup_inc_page_stat(struct page *page,
					    enum mem_cgroup_page_stat_item idx)
{
}

static inline void mem_cgroup_dec_page_stat(struct page *page,
					    enum mem_cgroup_page_stat_item idx)
{
}

static inline
unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
					    gfp_t gfp_mask,
					    unsigned long *total_scanned)
{
	return 0;
}

static inline
u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
{
	return 0;
}

static inline void mem_cgroup_split_huge_fixup(struct page *head,
						struct page *tail)
{
}

static inline
void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
{
}
#endif /* CONFIG_CGROUP_MEM_CONT */

#if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
static inline bool
mem_cgroup_bad_page_check(struct page *page)
{
	return false;
}

static inline void
mem_cgroup_print_bad_page(struct page *page)
{
}
#endif

enum {
	UNDER_LIMIT,
	SOFT_LIMIT,
	OVER_LIMIT,
};

struct sock;
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
void sock_update_memcg(struct sock *sk);
void sock_release_memcg(struct sock *sk);
#else
static inline void sock_update_memcg(struct sock *sk)
{
}
static inline void sock_release_memcg(struct sock *sk)
{
}
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
#endif /* _LINUX_MEMCONTROL_H */