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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 **memcgp); | |
58 | extern void mem_cgroup_commit_charge_swapin(struct page *page, | |
59 | struct mem_cgroup *memcg); | |
60 | extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg); | |
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 order); | |
82 | int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg); | |
83 | ||
84 | extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); | |
85 | extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); | |
86 | extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm); | |
87 | ||
88 | extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg); | |
89 | extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont); | |
90 | ||
91 | static inline | |
92 | int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup) | |
93 | { | |
94 | struct mem_cgroup *memcg; | |
95 | rcu_read_lock(); | |
96 | memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner)); | |
97 | rcu_read_unlock(); | |
98 | return cgroup == memcg; | |
99 | } | |
100 | ||
101 | extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg); | |
102 | ||
103 | extern int | |
104 | mem_cgroup_prepare_migration(struct page *page, | |
105 | struct page *newpage, struct mem_cgroup **memcgp, gfp_t gfp_mask); | |
106 | extern void mem_cgroup_end_migration(struct mem_cgroup *memcg, | |
107 | struct page *oldpage, struct page *newpage, bool migration_ok); | |
108 | ||
109 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, | |
110 | struct mem_cgroup *, | |
111 | struct mem_cgroup_reclaim_cookie *); | |
112 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); | |
113 | ||
114 | /* | |
115 | * For memory reclaim. | |
116 | */ | |
117 | int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, | |
118 | struct zone *zone); | |
119 | int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, | |
120 | struct zone *zone); | |
121 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); | |
122 | unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, | |
123 | int nid, int zid, unsigned int lrumask); | |
124 | struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, | |
125 | struct zone *zone); | |
126 | struct zone_reclaim_stat* | |
127 | mem_cgroup_get_reclaim_stat_from_page(struct page *page); | |
128 | extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, | |
129 | struct task_struct *p); | |
130 | extern void mem_cgroup_replace_page_cache(struct page *oldpage, | |
131 | struct page *newpage); | |
132 | ||
133 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP | |
134 | extern int do_swap_account; | |
135 | #endif | |
136 | ||
137 | static inline bool mem_cgroup_disabled(void) | |
138 | { | |
139 | if (mem_cgroup_subsys.disabled) | |
140 | return true; | |
141 | return false; | |
142 | } | |
143 | ||
144 | void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked, | |
145 | unsigned long *flags); | |
146 | ||
147 | extern atomic_t memcg_moving; | |
148 | ||
149 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, | |
150 | bool *locked, unsigned long *flags) | |
151 | { | |
152 | if (mem_cgroup_disabled()) | |
153 | return; | |
154 | rcu_read_lock(); | |
155 | *locked = false; | |
156 | if (atomic_read(&memcg_moving)) | |
157 | __mem_cgroup_begin_update_page_stat(page, locked, flags); | |
158 | } | |
159 | ||
160 | void __mem_cgroup_end_update_page_stat(struct page *page, | |
161 | unsigned long *flags); | |
162 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
163 | bool *locked, unsigned long *flags) | |
164 | { | |
165 | if (mem_cgroup_disabled()) | |
166 | return; | |
167 | if (*locked) | |
168 | __mem_cgroup_end_update_page_stat(page, flags); | |
169 | rcu_read_unlock(); | |
170 | } | |
171 | ||
172 | void mem_cgroup_update_page_stat(struct page *page, | |
173 | enum mem_cgroup_page_stat_item idx, | |
174 | int val); | |
175 | ||
176 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
177 | enum mem_cgroup_page_stat_item idx) | |
178 | { | |
179 | mem_cgroup_update_page_stat(page, idx, 1); | |
180 | } | |
181 | ||
182 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
183 | enum mem_cgroup_page_stat_item idx) | |
184 | { | |
185 | mem_cgroup_update_page_stat(page, idx, -1); | |
186 | } | |
187 | ||
188 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, | |
189 | gfp_t gfp_mask, | |
190 | unsigned long *total_scanned); | |
191 | u64 mem_cgroup_get_limit(struct mem_cgroup *memcg); | |
192 | ||
193 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); | |
194 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
195 | void mem_cgroup_split_huge_fixup(struct page *head); | |
196 | #endif | |
197 | ||
198 | #ifdef CONFIG_DEBUG_VM | |
199 | bool mem_cgroup_bad_page_check(struct page *page); | |
200 | void mem_cgroup_print_bad_page(struct page *page); | |
201 | #endif | |
202 | #else /* CONFIG_CGROUP_MEM_RES_CTLR */ | |
203 | struct mem_cgroup; | |
204 | ||
205 | static inline int mem_cgroup_newpage_charge(struct page *page, | |
206 | struct mm_struct *mm, gfp_t gfp_mask) | |
207 | { | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static inline int mem_cgroup_cache_charge(struct page *page, | |
212 | struct mm_struct *mm, gfp_t gfp_mask) | |
213 | { | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, | |
218 | struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp) | |
219 | { | |
220 | return 0; | |
221 | } | |
222 | ||
223 | static inline void mem_cgroup_commit_charge_swapin(struct page *page, | |
224 | struct mem_cgroup *memcg) | |
225 | { | |
226 | } | |
227 | ||
228 | static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg) | |
229 | { | |
230 | } | |
231 | ||
232 | static inline void mem_cgroup_uncharge_start(void) | |
233 | { | |
234 | } | |
235 | ||
236 | static inline void mem_cgroup_uncharge_end(void) | |
237 | { | |
238 | } | |
239 | ||
240 | static inline void mem_cgroup_uncharge_page(struct page *page) | |
241 | { | |
242 | } | |
243 | ||
244 | static inline void mem_cgroup_uncharge_cache_page(struct page *page) | |
245 | { | |
246 | } | |
247 | ||
248 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, | |
249 | struct mem_cgroup *memcg) | |
250 | { | |
251 | return &zone->lruvec; | |
252 | } | |
253 | ||
254 | static inline struct lruvec *mem_cgroup_lru_add_list(struct zone *zone, | |
255 | struct page *page, | |
256 | enum lru_list lru) | |
257 | { | |
258 | return &zone->lruvec; | |
259 | } | |
260 | ||
261 | static inline void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru) | |
262 | { | |
263 | } | |
264 | ||
265 | static inline void mem_cgroup_lru_del(struct page *page) | |
266 | { | |
267 | } | |
268 | ||
269 | static inline struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone, | |
270 | struct page *page, | |
271 | enum lru_list from, | |
272 | enum lru_list to) | |
273 | { | |
274 | return &zone->lruvec; | |
275 | } | |
276 | ||
277 | static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) | |
278 | { | |
279 | return NULL; | |
280 | } | |
281 | ||
282 | static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) | |
283 | { | |
284 | return NULL; | |
285 | } | |
286 | ||
287 | static inline int mm_match_cgroup(struct mm_struct *mm, | |
288 | struct mem_cgroup *memcg) | |
289 | { | |
290 | return 1; | |
291 | } | |
292 | ||
293 | static inline int task_in_mem_cgroup(struct task_struct *task, | |
294 | const struct mem_cgroup *memcg) | |
295 | { | |
296 | return 1; | |
297 | } | |
298 | ||
299 | static inline struct cgroup_subsys_state | |
300 | *mem_cgroup_css(struct mem_cgroup *memcg) | |
301 | { | |
302 | return NULL; | |
303 | } | |
304 | ||
305 | static inline int | |
306 | mem_cgroup_prepare_migration(struct page *page, struct page *newpage, | |
307 | struct mem_cgroup **memcgp, gfp_t gfp_mask) | |
308 | { | |
309 | return 0; | |
310 | } | |
311 | ||
312 | static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg, | |
313 | struct page *oldpage, struct page *newpage, bool migration_ok) | |
314 | { | |
315 | } | |
316 | ||
317 | static inline struct mem_cgroup * | |
318 | mem_cgroup_iter(struct mem_cgroup *root, | |
319 | struct mem_cgroup *prev, | |
320 | struct mem_cgroup_reclaim_cookie *reclaim) | |
321 | { | |
322 | return NULL; | |
323 | } | |
324 | ||
325 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
326 | struct mem_cgroup *prev) | |
327 | { | |
328 | } | |
329 | ||
330 | static inline bool mem_cgroup_disabled(void) | |
331 | { | |
332 | return true; | |
333 | } | |
334 | ||
335 | static inline int | |
336 | mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone) | |
337 | { | |
338 | return 1; | |
339 | } | |
340 | ||
341 | static inline int | |
342 | mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone) | |
343 | { | |
344 | return 1; | |
345 | } | |
346 | ||
347 | static inline unsigned long | |
348 | mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid, | |
349 | unsigned int lru_mask) | |
350 | { | |
351 | return 0; | |
352 | } | |
353 | ||
354 | ||
355 | static inline struct zone_reclaim_stat* | |
356 | mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone) | |
357 | { | |
358 | return NULL; | |
359 | } | |
360 | ||
361 | static inline struct zone_reclaim_stat* | |
362 | mem_cgroup_get_reclaim_stat_from_page(struct page *page) | |
363 | { | |
364 | return NULL; | |
365 | } | |
366 | ||
367 | static inline void | |
368 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
369 | { | |
370 | } | |
371 | ||
372 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, | |
373 | bool *locked, unsigned long *flags) | |
374 | { | |
375 | } | |
376 | ||
377 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
378 | bool *locked, unsigned long *flags) | |
379 | { | |
380 | } | |
381 | ||
382 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
383 | enum mem_cgroup_page_stat_item idx) | |
384 | { | |
385 | } | |
386 | ||
387 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
388 | enum mem_cgroup_page_stat_item idx) | |
389 | { | |
390 | } | |
391 | ||
392 | static inline | |
393 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, | |
394 | gfp_t gfp_mask, | |
395 | unsigned long *total_scanned) | |
396 | { | |
397 | return 0; | |
398 | } | |
399 | ||
400 | static inline | |
401 | u64 mem_cgroup_get_limit(struct mem_cgroup *memcg) | |
402 | { | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static inline void mem_cgroup_split_huge_fixup(struct page *head) | |
407 | { | |
408 | } | |
409 | ||
410 | static inline | |
411 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
412 | { | |
413 | } | |
414 | static inline void mem_cgroup_replace_page_cache(struct page *oldpage, | |
415 | struct page *newpage) | |
416 | { | |
417 | } | |
418 | #endif /* CONFIG_CGROUP_MEM_RES_CTLR */ | |
419 | ||
420 | #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM) | |
421 | static inline bool | |
422 | mem_cgroup_bad_page_check(struct page *page) | |
423 | { | |
424 | return false; | |
425 | } | |
426 | ||
427 | static inline void | |
428 | mem_cgroup_print_bad_page(struct page *page) | |
429 | { | |
430 | } | |
431 | #endif | |
432 | ||
433 | enum { | |
434 | UNDER_LIMIT, | |
435 | SOFT_LIMIT, | |
436 | OVER_LIMIT, | |
437 | }; | |
438 | ||
439 | struct sock; | |
440 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM | |
441 | void sock_update_memcg(struct sock *sk); | |
442 | void sock_release_memcg(struct sock *sk); | |
443 | #else | |
444 | static inline void sock_update_memcg(struct sock *sk) | |
445 | { | |
446 | } | |
447 | static inline void sock_release_memcg(struct sock *sk) | |
448 | { | |
449 | } | |
450 | #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */ | |
451 | #endif /* _LINUX_MEMCONTROL_H */ | |
452 |