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                                         int mode, struct zone *z,
  39                                         struct mem_cgroup *mem_cont,
  40                                         int active, int file);
  41
  42 struct memcg_scanrecord {
  43         struct mem_cgroup *mem; /* scanend memory cgroup */
  44         struct mem_cgroup *root; /* scan target hierarchy root */
  45         int context;            /* scanning context (see memcontrol.c) */
  46         unsigned long nr_scanned[2]; /* the number of scanned pages */
  47         unsigned long nr_rotated[2]; /* the number of rotated pages */
  48         unsigned long nr_freed[2]; /* the number of freed pages */
  49         unsigned long elapsed; /* nsec of time elapsed while scanning */
  50 };
  51
  52 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
  53 /*
  54  * All "charge" functions with gfp_mask should use GFP_KERNEL or
  55  * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
  56  * alloc memory but reclaims memory from all available zones. So, "where I want
  57  * memory from" bits of gfp_mask has no meaning. So any bits of that field is
  58  * available but adding a rule is better. charge functions' gfp_mask should
  59  * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
  60  * codes.
  61  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  62  */
  63
  64 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
  65                                 gfp_t gfp_mask);
  66 /* for swap handling */
  67 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  68                 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
  69 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  70                                         struct mem_cgroup *ptr);
  71 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  72
  73 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  74                                         gfp_t gfp_mask);
  75 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  76 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  77 extern void mem_cgroup_rotate_reclaimable_page(struct page *page);
  78 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  79 extern void mem_cgroup_del_lru(struct page *page);
  80 extern void mem_cgroup_move_lists(struct page *page,
  81                                   enum lru_list from, enum lru_list to);
  82
  83 /* For coalescing uncharge for reducing memcg' overhead*/
  84 extern void mem_cgroup_uncharge_start(void);
  85 extern void mem_cgroup_uncharge_end(void);
  86
  87 extern void mem_cgroup_uncharge_page(struct page *page);
  88 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  89
  90 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  91 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  92
  93 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
  94 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  95 extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);
  96
  97 static inline
  98 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  99 {
 100         struct mem_cgroup *mem;
 101         rcu_read_lock();
 102         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
 103         rcu_read_unlock();
 104         return cgroup == mem;
 105 }
 106
 107 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
 108
 109 extern int
 110 mem_cgroup_prepare_migration(struct page *page,
 111         struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask);
 112 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
 113         struct page *oldpage, struct page *newpage, bool migration_ok);
 114
 115 /*
 116  * For memory reclaim.
 117  */
 118 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 119 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 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
 130 extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
 131                                                   gfp_t gfp_mask, bool noswap,
 132                                                   struct memcg_scanrecord *rec);
 133 extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
 134                                                 gfp_t gfp_mask, bool noswap,
 135                                                 struct zone *zone,
 136                                                 struct memcg_scanrecord *rec,
 137                                                 unsigned long *nr_scanned);
 138
 139 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 140 extern int do_swap_account;
 141 #endif
 142
 143 static inline bool mem_cgroup_disabled(void)
 144 {
 145         if (mem_cgroup_subsys.disabled)
 146                 return true;
 147         return false;
 148 }
 149
 150 void mem_cgroup_update_page_stat(struct page *page,
 151                                  enum mem_cgroup_page_stat_item idx,
 152                                  int val);
 153
 154 static inline void mem_cgroup_inc_page_stat(struct page *page,
 155                                             enum mem_cgroup_page_stat_item idx)
 156 {
 157         mem_cgroup_update_page_stat(page, idx, 1);
 158 }
 159
 160 static inline void mem_cgroup_dec_page_stat(struct page *page,
 161                                             enum mem_cgroup_page_stat_item idx)
 162 {
 163         mem_cgroup_update_page_stat(page, idx, -1);
 164 }
 165
 166 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 167                                                 gfp_t gfp_mask,
 168                                                 unsigned long *total_scanned);
 169 u64 mem_cgroup_get_limit(struct mem_cgroup *mem);
 170
 171 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
 172 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 173 void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
 174 #endif
 175
 176 #ifdef CONFIG_DEBUG_VM
 177 bool mem_cgroup_bad_page_check(struct page *page);
 178 void mem_cgroup_print_bad_page(struct page *page);
 179 #endif
 180 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 181 struct mem_cgroup;
 182
 183 static inline int mem_cgroup_newpage_charge(struct page *page,
 184                                         struct mm_struct *mm, gfp_t gfp_mask)
 185 {
 186         return 0;
 187 }
 188
 189 static inline int mem_cgroup_cache_charge(struct page *page,
 190                                         struct mm_struct *mm, gfp_t gfp_mask)
 191 {
 192         return 0;
 193 }
 194
 195 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 196                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 197 {
 198         return 0;
 199 }
 200
 201 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 202                                           struct mem_cgroup *ptr)
 203 {
 204 }
 205
 206 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 207 {
 208 }
 209
 210 static inline void mem_cgroup_uncharge_start(void)
 211 {
 212 }
 213
 214 static inline void mem_cgroup_uncharge_end(void)
 215 {
 216 }
 217
 218 static inline void mem_cgroup_uncharge_page(struct page *page)
 219 {
 220 }
 221
 222 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 223 {
 224 }
 225
 226 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 227 {
 228 }
 229
 230 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 231 {
 232         return ;
 233 }
 234
 235 static inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
 236 {
 237         return ;
 238 }
 239
 240 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 241 {
 242         return ;
 243 }
 244
 245 static inline void mem_cgroup_del_lru(struct page *page)
 246 {
 247         return ;
 248 }
 249
 250 static inline void
 251 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 252 {
 253 }
 254
 255 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 256 {
 257         return NULL;
 258 }
 259
 260 static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 261 {
 262         return NULL;
 263 }
 264
 265 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 266 {
 267         return 1;
 268 }
 269
 270 static inline int task_in_mem_cgroup(struct task_struct *task,
 271                                      const struct mem_cgroup *mem)
 272 {
 273         return 1;
 274 }
 275
 276 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
 277 {
 278         return NULL;
 279 }
 280
 281 static inline int
 282 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 283         struct mem_cgroup **ptr, gfp_t gfp_mask)
 284 {
 285         return 0;
 286 }
 287
 288 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 289                 struct page *oldpage, struct page *newpage, bool migration_ok)
 290 {
 291 }
 292
 293 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 294 {
 295         return 0;
 296 }
 297
 298 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 299                                                 int priority)
 300 {
 301 }
 302
 303 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 304                                                 int priority)
 305 {
 306 }
 307
 308 static inline bool mem_cgroup_disabled(void)
 309 {
 310         return true;
 311 }
 312
 313 static inline int
 314 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 315 {
 316         return 1;
 317 }
 318
 319 static inline int
 320 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 321 {
 322         return 1;
 323 }
 324
 325 static inline unsigned long
 326 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
 327                                 unsigned int lru_mask)
 328 {
 329         return 0;
 330 }
 331
 332
 333 static inline struct zone_reclaim_stat*
 334 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 335 {
 336         return NULL;
 337 }
 338
 339 static inline struct zone_reclaim_stat*
 340 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 341 {
 342         return NULL;
 343 }
 344
 345 static inline void
 346 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 347 {
 348 }
 349
 350 static inline void mem_cgroup_inc_page_stat(struct page *page,
 351                                             enum mem_cgroup_page_stat_item idx)
 352 {
 353 }
 354
 355 static inline void mem_cgroup_dec_page_stat(struct page *page,
 356                                             enum mem_cgroup_page_stat_item idx)
 357 {
 358 }
 359
 360 static inline
 361 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 362                                             gfp_t gfp_mask,
 363                                             unsigned long *total_scanned)
 364 {
 365         return 0;
 366 }
 367
 368 static inline
 369 u64 mem_cgroup_get_limit(struct mem_cgroup *mem)
 370 {
 371         return 0;
 372 }
 373
 374 static inline void mem_cgroup_split_huge_fixup(struct page *head,
 375                                                 struct page *tail)
 376 {
 377 }
 378
 379 static inline
 380 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 381 {
 382 }
 383 #endif /* CONFIG_CGROUP_MEM_CONT */
 384
 385 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 386 static inline bool
 387 mem_cgroup_bad_page_check(struct page *page)
 388 {
 389         return false;
 390 }
 391
 392 static inline void
 393 mem_cgroup_print_bad_page(struct page *page)
 394 {
 395 }
 396 #endif
 397
 398 #endif /* _LINUX_MEMCONTROL_H */
 399