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 static inline
  89 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  90 {
  91         struct mem_cgroup *memcg;
  92         rcu_read_lock();
  93         memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  94         rcu_read_unlock();
  95         return cgroup == memcg;
  96 }
  97
  98 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
  99
 100 extern int
 101 mem_cgroup_prepare_migration(struct page *page,
 102         struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask);
 103 extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
 104         struct page *oldpage, struct page *newpage, bool migration_ok);
 105
 106 /*
 107  * For memory reclaim.
 108  */
 109 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg,
 110                                     struct zone *zone);
 111 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg,
 112                                     struct zone *zone);
 113 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
 114 unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
 115                                         int nid, int zid, unsigned int lrumask);
 116 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
 117                                                       struct zone *zone);
 118 struct zone_reclaim_stat*
 119 mem_cgroup_get_reclaim_stat_from_page(struct page *page);
 120 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 121                                         struct task_struct *p);
 122
 123 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 124 extern int do_swap_account;
 125 #endif
 126
 127 static inline bool mem_cgroup_disabled(void)
 128 {
 129         if (mem_cgroup_subsys.disabled)
 130                 return true;
 131         return false;
 132 }
 133
 134 void mem_cgroup_update_page_stat(struct page *page,
 135                                  enum mem_cgroup_page_stat_item idx,
 136                                  int val);
 137
 138 static inline void mem_cgroup_inc_page_stat(struct page *page,
 139                                             enum mem_cgroup_page_stat_item idx)
 140 {
 141         mem_cgroup_update_page_stat(page, idx, 1);
 142 }
 143
 144 static inline void mem_cgroup_dec_page_stat(struct page *page,
 145                                             enum mem_cgroup_page_stat_item idx)
 146 {
 147         mem_cgroup_update_page_stat(page, idx, -1);
 148 }
 149
 150 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 151                                                 gfp_t gfp_mask,
 152                                                 unsigned long *total_scanned);
 153 u64 mem_cgroup_get_limit(struct mem_cgroup *memcg);
 154
 155 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
 156 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 157 void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
 158 #endif
 159
 160 #ifdef CONFIG_DEBUG_VM
 161 bool mem_cgroup_bad_page_check(struct page *page);
 162 void mem_cgroup_print_bad_page(struct page *page);
 163 #endif
 164 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 165 struct mem_cgroup;
 166
 167 static inline int mem_cgroup_newpage_charge(struct page *page,
 168                                         struct mm_struct *mm, gfp_t gfp_mask)
 169 {
 170         return 0;
 171 }
 172
 173 static inline int mem_cgroup_cache_charge(struct page *page,
 174                                         struct mm_struct *mm, gfp_t gfp_mask)
 175 {
 176         return 0;
 177 }
 178
 179 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 180                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 181 {
 182         return 0;
 183 }
 184
 185 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 186                                           struct mem_cgroup *ptr)
 187 {
 188 }
 189
 190 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 191 {
 192 }
 193
 194 static inline void mem_cgroup_uncharge_start(void)
 195 {
 196 }
 197
 198 static inline void mem_cgroup_uncharge_end(void)
 199 {
 200 }
 201
 202 static inline void mem_cgroup_uncharge_page(struct page *page)
 203 {
 204 }
 205
 206 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 207 {
 208 }
 209
 210 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 211 {
 212 }
 213
 214 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 215 {
 216         return ;
 217 }
 218
 219 static inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
 220 {
 221         return ;
 222 }
 223
 224 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 225 {
 226         return ;
 227 }
 228
 229 static inline void mem_cgroup_del_lru(struct page *page)
 230 {
 231         return ;
 232 }
 233
 234 static inline void
 235 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 236 {
 237 }
 238
 239 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 240 {
 241         return NULL;
 242 }
 243
 244 static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 245 {
 246         return NULL;
 247 }
 248
 249 static inline int mm_match_cgroup(struct mm_struct *mm,
 250                 struct mem_cgroup *memcg)
 251 {
 252         return 1;
 253 }
 254
 255 static inline int task_in_mem_cgroup(struct task_struct *task,
 256                                      const struct mem_cgroup *memcg)
 257 {
 258         return 1;
 259 }
 260
 261 static inline struct cgroup_subsys_state
 262                 *mem_cgroup_css(struct mem_cgroup *memcg)
 263 {
 264         return NULL;
 265 }
 266
 267 static inline int
 268 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 269         struct mem_cgroup **ptr, gfp_t gfp_mask)
 270 {
 271         return 0;
 272 }
 273
 274 static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
 275                 struct page *oldpage, struct page *newpage, bool migration_ok)
 276 {
 277 }
 278
 279 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *memcg)
 280 {
 281         return 0;
 282 }
 283
 284 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *memcg,
 285                                                 int priority)
 286 {
 287 }
 288
 289 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *memcg,
 290                                                 int priority)
 291 {
 292 }
 293
 294 static inline bool mem_cgroup_disabled(void)
 295 {
 296         return true;
 297 }
 298
 299 static inline int
 300 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
 301 {
 302         return 1;
 303 }
 304
 305 static inline int
 306 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
 307 {
 308         return 1;
 309 }
 310
 311 static inline unsigned long
 312 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
 313                                 unsigned int lru_mask)
 314 {
 315         return 0;
 316 }
 317
 318
 319 static inline struct zone_reclaim_stat*
 320 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 321 {
 322         return NULL;
 323 }
 324
 325 static inline struct zone_reclaim_stat*
 326 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 327 {
 328         return NULL;
 329 }
 330
 331 static inline void
 332 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 333 {
 334 }
 335
 336 static inline void mem_cgroup_inc_page_stat(struct page *page,
 337                                             enum mem_cgroup_page_stat_item idx)
 338 {
 339 }
 340
 341 static inline void mem_cgroup_dec_page_stat(struct page *page,
 342                                             enum mem_cgroup_page_stat_item idx)
 343 {
 344 }
 345
 346 static inline
 347 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 348                                             gfp_t gfp_mask,
 349                                             unsigned long *total_scanned)
 350 {
 351         return 0;
 352 }
 353
 354 static inline
 355 u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
 356 {
 357         return 0;
 358 }
 359
 360 static inline void mem_cgroup_split_huge_fixup(struct page *head,
 361                                                 struct page *tail)
 362 {
 363 }
 364
 365 static inline
 366 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 367 {
 368 }
 369 #endif /* CONFIG_CGROUP_MEM_CONT */
 370
 371 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 372 static inline bool
 373 mem_cgroup_bad_page_check(struct page *page)
 374 {
 375         return false;
 376 }
 377
 378 static inline void
 379 mem_cgroup_print_bad_page(struct page *page)
 380 {
 381 }
 382 #endif
 383
 384 #endif /* _LINUX_MEMCONTROL_H */
 385