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 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
  43 /*
  44  * All "charge" functions with gfp_mask should use GFP_KERNEL or
  45  * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
  46  * alloc memory but reclaims memory from all available zones. So, "where I want
  47  * memory from" bits of gfp_mask has no meaning. So any bits of that field is
  48  * available but adding a rule is better. charge functions' gfp_mask should
  49  * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
  50  * codes.
  51  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  52  */
  53
  54 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
  55                                 gfp_t gfp_mask);
  56 /* for swap handling */
  57 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  58                 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
  59 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  60                                         struct mem_cgroup *ptr);
  61 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  62
  63 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  64                                         gfp_t gfp_mask);
  65 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  66 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  67 extern void mem_cgroup_rotate_reclaimable_page(struct page *page);
  68 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  69 extern void mem_cgroup_del_lru(struct page *page);
  70 extern void mem_cgroup_move_lists(struct page *page,
  71                                   enum lru_list from, enum lru_list to);
  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 extern int mem_cgroup_shmem_charge_fallback(struct page *page,
  80                         struct mm_struct *mm, gfp_t gfp_mask);
  81
  82 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  83 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  84
  85 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
  86 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  87 extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);
  88
  89 static inline
  90 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  91 {
  92         struct mem_cgroup *mem;
  93         rcu_read_lock();
  94         mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
  95         rcu_read_unlock();
  96         return cgroup == mem;
  97 }
  98
  99 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
 100
 101 extern int
 102 mem_cgroup_prepare_migration(struct page *page,
 103         struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask);
 104 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
 105         struct page *oldpage, struct page *newpage, bool migration_ok);
 106
 107 /*
 108  * For memory reclaim.
 109  */
 110 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
 111 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
 112 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
 113 unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
 114                                                 struct zone *zone,
 115                                                 enum lru_list lru);
 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 *mem);
 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 int mem_cgroup_shmem_charge_fallback(struct page *page,
 211                         struct mm_struct *mm, gfp_t gfp_mask)
 212 {
 213         return 0;
 214 }
 215
 216 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 217 {
 218 }
 219
 220 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 221 {
 222         return ;
 223 }
 224
 225 static inline void mem_cgroup_rotate_reclaimable_page(struct page *page)
 226 {
 227         return ;
 228 }
 229
 230 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 231 {
 232         return ;
 233 }
 234
 235 static inline void mem_cgroup_del_lru(struct page *page)
 236 {
 237         return ;
 238 }
 239
 240 static inline void
 241 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 242 {
 243 }
 244
 245 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 246 {
 247         return NULL;
 248 }
 249
 250 static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 251 {
 252         return NULL;
 253 }
 254
 255 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 256 {
 257         return 1;
 258 }
 259
 260 static inline int task_in_mem_cgroup(struct task_struct *task,
 261                                      const struct mem_cgroup *mem)
 262 {
 263         return 1;
 264 }
 265
 266 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
 267 {
 268         return NULL;
 269 }
 270
 271 static inline int
 272 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 273         struct mem_cgroup **ptr, gfp_t gfp_mask)
 274 {
 275         return 0;
 276 }
 277
 278 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 279                 struct page *oldpage, struct page *newpage, bool migration_ok)
 280 {
 281 }
 282
 283 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 284 {
 285         return 0;
 286 }
 287
 288 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 289                                                 int priority)
 290 {
 291 }
 292
 293 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 294                                                 int priority)
 295 {
 296 }
 297
 298 static inline bool mem_cgroup_disabled(void)
 299 {
 300         return true;
 301 }
 302
 303 static inline int
 304 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
 305 {
 306         return 1;
 307 }
 308
 309 static inline int
 310 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
 311 {
 312         return 1;
 313 }
 314
 315 static inline unsigned long
 316 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, struct zone *zone,
 317                              enum lru_list lru)
 318 {
 319         return 0;
 320 }
 321
 322
 323 static inline struct zone_reclaim_stat*
 324 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
 325 {
 326         return NULL;
 327 }
 328
 329 static inline struct zone_reclaim_stat*
 330 mem_cgroup_get_reclaim_stat_from_page(struct page *page)
 331 {
 332         return NULL;
 333 }
 334
 335 static inline void
 336 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 337 {
 338 }
 339
 340 static inline void mem_cgroup_inc_page_stat(struct page *page,
 341                                             enum mem_cgroup_page_stat_item idx)
 342 {
 343 }
 344
 345 static inline void mem_cgroup_dec_page_stat(struct page *page,
 346                                             enum mem_cgroup_page_stat_item idx)
 347 {
 348 }
 349
 350 static inline
 351 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 352                                             gfp_t gfp_mask,
 353                                             unsigned long *total_scanned)
 354 {
 355         return 0;
 356 }
 357
 358 static inline
 359 u64 mem_cgroup_get_limit(struct mem_cgroup *mem)
 360 {
 361         return 0;
 362 }
 363
 364 static inline void mem_cgroup_split_huge_fixup(struct page *head,
 365                                                 struct page *tail)
 366 {
 367 }
 368
 369 static inline
 370 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 371 {
 372 }
 373 #endif /* CONFIG_CGROUP_MEM_CONT */
 374
 375 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
 376 static inline bool
 377 mem_cgroup_bad_page_check(struct page *page)
 378 {
 379         return false;
 380 }
 381
 382 static inline void
 383 mem_cgroup_print_bad_page(struct page *page)
 384 {
 385 }
 386 #endif
 387
 388 #endif /* _LINUX_MEMCONTROL_H */
 389