include/linux/memcontrol.h

   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 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  36                                         struct list_head *dst,
  37                                         unsigned long *scanned, int order,
  38                                         isolate_mode_t mode,
  39                                         struct zone *z,
  40                                         struct mem_cgroup *mem_cont,
  41                                         int active, int file);
  42
  43 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
  44 /*
  45  * All "charge" functions with gfp_mask should use GFP_KERNEL or
  46  * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
  47  * alloc memory but reclaims memory from all available zones. So, "where I want
  48  * memory from" bits of gfp_mask has no meaning. So any bits of that field is
  49  * available but adding a rule is better. charge functions' gfp_mask should
  50  * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
  51  * codes.
  52  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  53  */
  54
  55 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
  56                                 gfp_t gfp_mask);
  57 /* for swap handling */
  58 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  59                 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
  60 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  61                                         struct mem_cgroup *ptr);
  62 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  63
  64 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  65                                         gfp_t gfp_mask);
  66 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  67 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  68 extern void mem_cgroup_rotate_reclaimable_page(struct page *page);
  69 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  70 extern void mem_cgroup_del_lru(struct page *page);
  71 extern void mem_cgroup_move_lists(struct page *page,
  72                                   enum lru_list from, enum lru_list to);
  73
  74 /* For coalescing uncharge for reducing memcg' overhead*/
  75 extern void mem_cgroup_uncharge_start(void);
  76 extern void mem_cgroup_uncharge_end(void);
  77
  78 extern void mem_cgroup_uncharge_page(struct page *page);
  79 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  80
  81 extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask);
  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 **ptr, 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 /*
 110  * For memory reclaim.
 111  */
 112 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg,
 113                                     struct zone *zone);
 114 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg,
 115                                     struct zone *zone);
 116 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
 117 unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
 118                                         int nid, int zid, unsigned int lrumask);
 119 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 120                                                       struct zone *zone);
 121 struct zone_reclaim_stat*
 122 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 123 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 124                                         struct task_struct *p);
 125
 126 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 127 extern int do_swap_account;
 128 #endif
 129
 130 static inline bool mem_cgroup_disabled(void)
 131 {
 132         if (mem_cgroup_subsys.disabled)
 133                 return true;
 134         return false;
 135 }
 136
 137 void mem_cgroup_update_page_stat(struct page *page,
 138                                  enum mem_cgroup_page_stat_item idx,
 139                                  int val);
 140
 141 static inline void mem_cgroup_inc_page_stat(struct page *page,
 142                                             enum mem_cgroup_page_stat_item idx)
 143 {
 144         mem_cgroup_update_page_stat(page, idx, 1);
 145 }
 146
 147 static inline void mem_cgroup_dec_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 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 154                                                 gfp_t gfp_mask,
 155                                                 unsigned long *total_scanned);
 156 u64 mem_cgroup_get_limit(struct mem_cgroup *memcg);
 157
 158 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
 159 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 160 void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
 161 #endif
 162
 163 #ifdef CONFIG_DEBUG_VM
 164 bool mem_cgroup_bad_page_check(struct page *page);
 165 void mem_cgroup_print_bad_page(struct page *page);
 166 #endif
 167 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 168 struct mem_cgroup;
 169
 170 static inline int mem_cgroup_newpage_charge(struct page *page,
 171                                         struct mm_struct *mm, gfp_t gfp_mask)
 172 {
 173         return 0;
 174 }
 175
 176 static inline int mem_cgroup_cache_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_try_charge_swapin(struct mm_struct *mm,
 183                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 184 {
 185         return 0;
 186 }
 187
 188 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 189                                           struct mem_cgroup *ptr)
 190 {
 191 }
 192
 193 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 194 {
 195 }
 196
 197 static inline void mem_cgroup_uncharge_start(void)
 198 {
 199 }
 200
 201 static inline void mem_cgroup_uncharge_end(void)
 202 {
 203 }
 204
 205 static inline void mem_cgroup_uncharge_page(struct page *page)
 206 {
 207 }
 208
 209 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 210 {
 211 }
 212
 213 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 214 {
 215 }
 216
 217 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 218 {
 219         return ;
 220 }
 221
 222 static inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
 223 {
 224         return ;
 225 }
 226
 227 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 228 {
 229         return ;
 230 }
 231
 232 static inline void mem_cgroup_del_lru(struct page *page)
 233 {
 234         return ;
 235 }
 236
 237 static inline void
 238 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 239 {
 240 }
 241
 242 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 243 {
 244         return NULL;
 245 }
 246
 247 static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 248 {
 249         return NULL;
 250 }
 251
 252 static inline int mm_match_cgroup(struct mm_struct *mm,
 253                 struct mem_cgroup *memcg)
 254 {
 255         return 1;
 256 }
 257
 258 static inline int task_in_mem_cgroup(struct task_struct *task,
 259                                      const struct mem_cgroup *memcg)
 260 {
 261         return 1;
 262 }
 263
 264 static inline struct cgroup_subsys_state
 265                 *mem_cgroup_css(struct mem_cgroup *memcg)
 266 {
 267         return NULL;
 268 }
 269
 270 static inline int
 271 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 272         struct mem_cgroup **ptr, gfp_t gfp_mask)
 273 {
 274         return 0;
 275 }
 276
 277 static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
 278                 struct page *oldpage, struct page *newpage, bool migration_ok)
 279 {
 280 }
 281
 282 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *memcg)
 283 {
 284         return 0;
 285 }
 286
 287 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *memcg,
 288                                                 int priority)
 289 {
 290 }
 291
 292 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *memcg,
 293                                                 int priority)
 294 {
 295 }
 296
 297 static inline bool mem_cgroup_disabled(void)
 298 {
 299         return true;
 300 }
 301
 302 static inline int
 303 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
 304 {
 305         return 1;
 306 }
 307
 308 static inline int
 309 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
 310 {
 311         return 1;
 312 }
 313
 314 static inline unsigned long
 315 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
 316                                 unsigned int lru_mask)
 317 {
 318         return 0;
 319 }
 320
 321
 322 static inline struct zone_reclaim_stat*
 323 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 324 {
 325         return NULL;
 326 }
 327
 328 static inline struct zone_reclaim_stat*
 329 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 330 {
 331         return NULL;
 332 }
 333
 334 static inline void
 335 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 336 {
 337 }
 338
 339 static inline void mem_cgroup_inc_page_stat(struct page *page,
 340                                             enum mem_cgroup_page_stat_item idx)
 341 {
 342 }
 343
 344 static inline void mem_cgroup_dec_page_stat(struct page *page,
 345                                             enum mem_cgroup_page_stat_item idx)
 346 {
 347 }
 348
 349 static inline
 350 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 351                                             gfp_t gfp_mask,
 352                                             unsigned long *total_scanned)
 353 {
 354         return 0;
 355 }
 356
 357 static inline
 358 u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
 359 {
 360         return 0;
 361 }
 362
 363 static inline void mem_cgroup_split_huge_fixup(struct page *head,
 364                                                 struct page *tail)
 365 {
 366 }
 367
 368 static inline
 369 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 370 {
 371 }
 372 #endif /* CONFIG_CGROUP_MEM_CONT */
 373
 374 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 375 static inline bool
 376 mem_cgroup_bad_page_check(struct page *page)
 377 {
 378         return false;
 379 }
 380
 381 static inline void
 382 mem_cgroup_print_bad_page(struct page *page)
 383 {
 384 }
 385 #endif
 386
 387 #ifdef CONFIG_INET
 388 enum {
 389         UNDER_LIMIT,
 390         SOFT_LIMIT,
 391         OVER_LIMIT,
 392 };
 393
 394 struct sock;
 395 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
 396 void sock_update_memcg(struct sock *sk);
 397 void sock_release_memcg(struct sock *sk);
 398 #else
 399 static inline void sock_update_memcg(struct sock *sk)
 400 {
 401 }
 402 static inline void sock_release_memcg(struct sock *sk)
 403 {
 404 }
 405 #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
 406 #endif /* CONFIG_INET */
 407 #endif /* _LINUX_MEMCONTROL_H */
 408