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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> | |
23 | #include <linux/vm_event_item.h> | |
24 | ||
25 | struct mem_cgroup; | |
26 | struct page_cgroup; | |
27 | struct page; | |
28 | struct mm_struct; | |
29 | ||
30 | /* Stats that can be updated by kernel. */ | |
31 | enum mem_cgroup_page_stat_item { | |
32 | MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */ | |
33 | }; | |
34 | ||
35 | struct mem_cgroup_reclaim_cookie { | |
36 | struct zone *zone; | |
37 | int priority; | |
38 | unsigned int generation; | |
39 | }; | |
40 | ||
41 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR | |
42 | /* | |
43 | * All "charge" functions with gfp_mask should use GFP_KERNEL or | |
44 | * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't | |
45 | * alloc memory but reclaims memory from all available zones. So, "where I want | |
46 | * memory from" bits of gfp_mask has no meaning. So any bits of that field is | |
47 | * available but adding a rule is better. charge functions' gfp_mask should | |
48 | * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous | |
49 | * codes. | |
50 | * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.) | |
51 | */ | |
52 | ||
53 | extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm, | |
54 | gfp_t gfp_mask); | |
55 | /* for swap handling */ | |
56 | extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm, | |
57 | struct page *page, gfp_t mask, struct mem_cgroup **ptr); | |
58 | extern void mem_cgroup_commit_charge_swapin(struct page *page, | |
59 | struct mem_cgroup *ptr); | |
60 | extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr); | |
61 | ||
62 | extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, | |
63 | gfp_t gfp_mask); | |
64 | ||
65 | struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); | |
66 | struct lruvec *mem_cgroup_lru_add_list(struct zone *, struct page *, | |
67 | enum lru_list); | |
68 | void mem_cgroup_lru_del_list(struct page *, enum lru_list); | |
69 | void mem_cgroup_lru_del(struct page *); | |
70 | struct lruvec *mem_cgroup_lru_move_lists(struct zone *, struct page *, | |
71 | enum lru_list, enum lru_list); | |
72 | ||
73 | /* For coalescing uncharge for reducing memcg' overhead*/ | |
74 | extern void mem_cgroup_uncharge_start(void); | |
75 | extern void mem_cgroup_uncharge_end(void); | |
76 | ||
77 | extern void mem_cgroup_uncharge_page(struct page *page); | |
78 | extern void mem_cgroup_uncharge_cache_page(struct page *page); | |
79 | ||
80 | extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask); | |
81 | int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg); | |
82 | ||
83 | extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); | |
84 | extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); | |
85 | extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm); | |
86 | ||
87 | extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg); | |
88 | extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont); | |
89 | ||
90 | static inline | |
91 | int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup) | |
92 | { | |
93 | struct mem_cgroup *memcg; | |
94 | rcu_read_lock(); | |
95 | memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner)); | |
96 | rcu_read_unlock(); | |
97 | return cgroup == memcg; | |
98 | } | |
99 | ||
100 | extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg); | |
101 | ||
102 | extern int | |
103 | mem_cgroup_prepare_migration(struct page *page, | |
104 | struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask); | |
105 | extern void mem_cgroup_end_migration(struct mem_cgroup *memcg, | |
106 | struct page *oldpage, struct page *newpage, bool migration_ok); | |
107 | ||
108 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, | |
109 | struct mem_cgroup *, | |
110 | struct mem_cgroup_reclaim_cookie *); | |
111 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); | |
112 | ||
113 | /* | |
114 | * For memory reclaim. | |
115 | */ | |
116 | int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, | |
117 | struct zone *zone); | |
118 | int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, | |
119 | struct zone *zone); | |
120 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); | |
121 | unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, | |
122 | int nid, int zid, unsigned int lrumask); | |
123 | struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, | |
124 | struct zone *zone); | |
125 | struct zone_reclaim_stat* | |
126 | mem_cgroup_get_reclaim_stat_from_page(struct page *page); | |
127 | extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, | |
128 | struct task_struct *p); | |
129 | extern void mem_cgroup_replace_page_cache(struct page *oldpage, | |
130 | struct page *newpage); | |
131 | ||
132 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP | |
133 | extern int do_swap_account; | |
134 | #endif | |
135 | ||
136 | static inline bool mem_cgroup_disabled(void) | |
137 | { | |
138 | if (mem_cgroup_subsys.disabled) | |
139 | return true; | |
140 | return false; | |
141 | } | |
142 | ||
143 | void mem_cgroup_update_page_stat(struct page *page, | |
144 | enum mem_cgroup_page_stat_item idx, | |
145 | int val); | |
146 | ||
147 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
148 | enum mem_cgroup_page_stat_item idx) | |
149 | { | |
150 | mem_cgroup_update_page_stat(page, idx, 1); | |
151 | } | |
152 | ||
153 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
154 | enum mem_cgroup_page_stat_item idx) | |
155 | { | |
156 | mem_cgroup_update_page_stat(page, idx, -1); | |
157 | } | |
158 | ||
159 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, | |
160 | gfp_t gfp_mask, | |
161 | unsigned long *total_scanned); | |
162 | u64 mem_cgroup_get_limit(struct mem_cgroup *memcg); | |
163 | ||
164 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); | |
165 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
166 | void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail); | |
167 | #endif | |
168 | ||
169 | #ifdef CONFIG_DEBUG_VM | |
170 | bool mem_cgroup_bad_page_check(struct page *page); | |
171 | void mem_cgroup_print_bad_page(struct page *page); | |
172 | #endif | |
173 | #else /* CONFIG_CGROUP_MEM_RES_CTLR */ | |
174 | struct mem_cgroup; | |
175 | ||
176 | static inline int mem_cgroup_newpage_charge(struct page *page, | |
177 | struct mm_struct *mm, gfp_t gfp_mask) | |
178 | { | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static inline int mem_cgroup_cache_charge(struct page *page, | |
183 | struct mm_struct *mm, gfp_t gfp_mask) | |
184 | { | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, | |
189 | struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr) | |
190 | { | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static inline void mem_cgroup_commit_charge_swapin(struct page *page, | |
195 | struct mem_cgroup *ptr) | |
196 | { | |
197 | } | |
198 | ||
199 | static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr) | |
200 | { | |
201 | } | |
202 | ||
203 | static inline void mem_cgroup_uncharge_start(void) | |
204 | { | |
205 | } | |
206 | ||
207 | static inline void mem_cgroup_uncharge_end(void) | |
208 | { | |
209 | } | |
210 | ||
211 | static inline void mem_cgroup_uncharge_page(struct page *page) | |
212 | { | |
213 | } | |
214 | ||
215 | static inline void mem_cgroup_uncharge_cache_page(struct page *page) | |
216 | { | |
217 | } | |
218 | ||
219 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, | |
220 | struct mem_cgroup *memcg) | |
221 | { | |
222 | return &zone->lruvec; | |
223 | } | |
224 | ||
225 | static inline struct lruvec *mem_cgroup_lru_add_list(struct zone *zone, | |
226 | struct page *page, | |
227 | enum lru_list lru) | |
228 | { | |
229 | return &zone->lruvec; | |
230 | } | |
231 | ||
232 | static inline void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru) | |
233 | { | |
234 | } | |
235 | ||
236 | static inline void mem_cgroup_lru_del(struct page *page) | |
237 | { | |
238 | } | |
239 | ||
240 | static inline struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone, | |
241 | struct page *page, | |
242 | enum lru_list from, | |
243 | enum lru_list to) | |
244 | { | |
245 | return &zone->lruvec; | |
246 | } | |
247 | ||
248 | static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) | |
249 | { | |
250 | return NULL; | |
251 | } | |
252 | ||
253 | static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) | |
254 | { | |
255 | return NULL; | |
256 | } | |
257 | ||
258 | static inline int mm_match_cgroup(struct mm_struct *mm, | |
259 | struct mem_cgroup *memcg) | |
260 | { | |
261 | return 1; | |
262 | } | |
263 | ||
264 | static inline int task_in_mem_cgroup(struct task_struct *task, | |
265 | const struct mem_cgroup *memcg) | |
266 | { | |
267 | return 1; | |
268 | } | |
269 | ||
270 | static inline struct cgroup_subsys_state | |
271 | *mem_cgroup_css(struct mem_cgroup *memcg) | |
272 | { | |
273 | return NULL; | |
274 | } | |
275 | ||
276 | static inline int | |
277 | mem_cgroup_prepare_migration(struct page *page, struct page *newpage, | |
278 | struct mem_cgroup **ptr, gfp_t gfp_mask) | |
279 | { | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg, | |
284 | struct page *oldpage, struct page *newpage, bool migration_ok) | |
285 | { | |
286 | } | |
287 | ||
288 | static inline struct mem_cgroup * | |
289 | mem_cgroup_iter(struct mem_cgroup *root, | |
290 | struct mem_cgroup *prev, | |
291 | struct mem_cgroup_reclaim_cookie *reclaim) | |
292 | { | |
293 | return NULL; | |
294 | } | |
295 | ||
296 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
297 | struct mem_cgroup *prev) | |
298 | { | |
299 | } | |
300 | ||
301 | static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *memcg) | |
302 | { | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *memcg, | |
307 | int priority) | |
308 | { | |
309 | } | |
310 | ||
311 | static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *memcg, | |
312 | int priority) | |
313 | { | |
314 | } | |
315 | ||
316 | static inline bool mem_cgroup_disabled(void) | |
317 | { | |
318 | return true; | |
319 | } | |
320 | ||
321 | static inline int | |
322 | mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone) | |
323 | { | |
324 | return 1; | |
325 | } | |
326 | ||
327 | static inline int | |
328 | mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone) | |
329 | { | |
330 | return 1; | |
331 | } | |
332 | ||
333 | static inline unsigned long | |
334 | mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid, | |
335 | unsigned int lru_mask) | |
336 | { | |
337 | return 0; | |
338 | } | |
339 | ||
340 | ||
341 | static inline struct zone_reclaim_stat* | |
342 | mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone) | |
343 | { | |
344 | return NULL; | |
345 | } | |
346 | ||
347 | static inline struct zone_reclaim_stat* | |
348 | mem_cgroup_get_reclaim_stat_from_page(struct page *page) | |
349 | { | |
350 | return NULL; | |
351 | } | |
352 | ||
353 | static inline void | |
354 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
355 | { | |
356 | } | |
357 | ||
358 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
359 | enum mem_cgroup_page_stat_item idx) | |
360 | { | |
361 | } | |
362 | ||
363 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
364 | enum mem_cgroup_page_stat_item idx) | |
365 | { | |
366 | } | |
367 | ||
368 | static inline | |
369 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, | |
370 | gfp_t gfp_mask, | |
371 | unsigned long *total_scanned) | |
372 | { | |
373 | return 0; | |
374 | } | |
375 | ||
376 | static inline | |
377 | u64 mem_cgroup_get_limit(struct mem_cgroup *memcg) | |
378 | { | |
379 | return 0; | |
380 | } | |
381 | ||
382 | static inline void mem_cgroup_split_huge_fixup(struct page *head, | |
383 | struct page *tail) | |
384 | { | |
385 | } | |
386 | ||
387 | static inline | |
388 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
389 | { | |
390 | } | |
391 | static inline void mem_cgroup_replace_page_cache(struct page *oldpage, | |
392 | struct page *newpage) | |
393 | { | |
394 | } | |
395 | #endif /* CONFIG_CGROUP_MEM_CONT */ | |
396 | ||
397 | #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM) | |
398 | static inline bool | |
399 | mem_cgroup_bad_page_check(struct page *page) | |
400 | { | |
401 | return false; | |
402 | } | |
403 | ||
404 | static inline void | |
405 | mem_cgroup_print_bad_page(struct page *page) | |
406 | { | |
407 | } | |
408 | #endif | |
409 | ||
410 | enum { | |
411 | UNDER_LIMIT, | |
412 | SOFT_LIMIT, | |
413 | OVER_LIMIT, | |
414 | }; | |
415 | ||
416 | struct sock; | |
417 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM | |
418 | void sock_update_memcg(struct sock *sk); | |
419 | void sock_release_memcg(struct sock *sk); | |
420 | #else | |
421 | static inline void sock_update_memcg(struct sock *sk) | |
422 | { | |
423 | } | |
424 | static inline void sock_release_memcg(struct sock *sk) | |
425 | { | |
426 | } | |
427 | #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */ | |
428 | #endif /* _LINUX_MEMCONTROL_H */ | |
429 |