1 /* memcontrol.h - Memory Controller 2 * 3 * Copyright IBM Corporation, 2007 4 * Author Balbir Singh <[email protected]> 5 * 6 * Copyright 2007 OpenVZ SWsoft Inc 7 * Author: Pavel Emelianov <[email protected]> 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 extern int mem_cgroup_shmem_charge_fallback(struct page *page, 90 struct mm_struct *mm, gfp_t gfp_mask); 91 92 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask); 93 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem); 94 95 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); 96 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); 97 extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm); 98 99 static inline 100 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup) 101 { 102 struct mem_cgroup *mem; 103 rcu_read_lock(); 104 mem = mem_cgroup_from_task(rcu_dereference((mm)->owner)); 105 rcu_read_unlock(); 106 return cgroup == mem; 107 } 108 109 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem); 110 111 extern int 112 mem_cgroup_prepare_migration(struct page *page, 113 struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask); 114 extern void mem_cgroup_end_migration(struct mem_cgroup *mem, 115 struct page *oldpage, struct page *newpage, bool migration_ok); 116 117 /* 118 * For memory reclaim. 119 */ 120 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg); 121 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg); 122 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); 123 unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, 124 int nid, int zid, unsigned int lrumask); 125 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, 126 struct zone *zone); 127 struct zone_reclaim_stat* 128 mem_cgroup_get_reclaim_stat_from_page(struct page *page); 129 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, 130 struct task_struct *p); 131 132 extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem, 133 gfp_t gfp_mask, bool noswap, 134 struct memcg_scanrecord *rec); 135 extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem, 136 gfp_t gfp_mask, bool noswap, 137 struct zone *zone, 138 struct memcg_scanrecord *rec, 139 unsigned long *nr_scanned); 140 141 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP 142 extern int do_swap_account; 143 #endif 144 145 static inline bool mem_cgroup_disabled(void) 146 { 147 if (mem_cgroup_subsys.disabled) 148 return true; 149 return false; 150 } 151 152 void mem_cgroup_update_page_stat(struct page *page, 153 enum mem_cgroup_page_stat_item idx, 154 int val); 155 156 static inline void mem_cgroup_inc_page_stat(struct page *page, 157 enum mem_cgroup_page_stat_item idx) 158 { 159 mem_cgroup_update_page_stat(page, idx, 1); 160 } 161 162 static inline void mem_cgroup_dec_page_stat(struct page *page, 163 enum mem_cgroup_page_stat_item idx) 164 { 165 mem_cgroup_update_page_stat(page, idx, -1); 166 } 167 168 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, 169 gfp_t gfp_mask, 170 unsigned long *total_scanned); 171 u64 mem_cgroup_get_limit(struct mem_cgroup *mem); 172 173 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); 174 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 175 void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail); 176 #endif 177 178 #ifdef CONFIG_DEBUG_VM 179 bool mem_cgroup_bad_page_check(struct page *page); 180 void mem_cgroup_print_bad_page(struct page *page); 181 #endif 182 #else /* CONFIG_CGROUP_MEM_RES_CTLR */ 183 struct mem_cgroup; 184 185 static inline int mem_cgroup_newpage_charge(struct page *page, 186 struct mm_struct *mm, gfp_t gfp_mask) 187 { 188 return 0; 189 } 190 191 static inline int mem_cgroup_cache_charge(struct page *page, 192 struct mm_struct *mm, gfp_t gfp_mask) 193 { 194 return 0; 195 } 196 197 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 198 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr) 199 { 200 return 0; 201 } 202 203 static inline void mem_cgroup_commit_charge_swapin(struct page *page, 204 struct mem_cgroup *ptr) 205 { 206 } 207 208 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr) 209 { 210 } 211 212 static inline void mem_cgroup_uncharge_start(void) 213 { 214 } 215 216 static inline void mem_cgroup_uncharge_end(void) 217 { 218 } 219 220 static inline void mem_cgroup_uncharge_page(struct page *page) 221 { 222 } 223 224 static inline void mem_cgroup_uncharge_cache_page(struct page *page) 225 { 226 } 227 228 static inline int mem_cgroup_shmem_charge_fallback(struct page *page, 229 struct mm_struct *mm, gfp_t gfp_mask) 230 { 231 return 0; 232 } 233 234 static inline void mem_cgroup_add_lru_list(struct page *page, int lru) 235 { 236 } 237 238 static inline void mem_cgroup_del_lru_list(struct page *page, int lru) 239 { 240 return ; 241 } 242 243 static inline void mem_cgroup_rotate_reclaimable_page(struct page *page) 244 { 245 return ; 246 } 247 248 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru) 249 { 250 return ; 251 } 252 253 static inline void mem_cgroup_del_lru(struct page *page) 254 { 255 return ; 256 } 257 258 static inline void 259 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to) 260 { 261 } 262 263 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) 264 { 265 return NULL; 266 } 267 268 static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) 269 { 270 return NULL; 271 } 272 273 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem) 274 { 275 return 1; 276 } 277 278 static inline int task_in_mem_cgroup(struct task_struct *task, 279 const struct mem_cgroup *mem) 280 { 281 return 1; 282 } 283 284 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem) 285 { 286 return NULL; 287 } 288 289 static inline int 290 mem_cgroup_prepare_migration(struct page *page, struct page *newpage, 291 struct mem_cgroup **ptr, gfp_t gfp_mask) 292 { 293 return 0; 294 } 295 296 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem, 297 struct page *oldpage, struct page *newpage, bool migration_ok) 298 { 299 } 300 301 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) 302 { 303 return 0; 304 } 305 306 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, 307 int priority) 308 { 309 } 310 311 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 312 int priority) 313 { 314 } 315 316 static inline bool mem_cgroup_disabled(void) 317 { 318 return true; 319 } 320 321 static inline int 322 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg) 323 { 324 return 1; 325 } 326 327 static inline int 328 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg) 329 { 330 return 1; 331 } 332 333 static inline unsigned long 334 mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid, 335 unsigned int lru_mask) 336 { 337 return 0; 338 } 339 340 341 static inline struct zone_reclaim_stat* 342 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone) 343 { 344 return NULL; 345 } 346 347 static inline struct zone_reclaim_stat* 348 mem_cgroup_get_reclaim_stat_from_page(struct page *page) 349 { 350 return NULL; 351 } 352 353 static inline void 354 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) 355 { 356 } 357 358 static inline void mem_cgroup_inc_page_stat(struct page *page, 359 enum mem_cgroup_page_stat_item idx) 360 { 361 } 362 363 static inline void mem_cgroup_dec_page_stat(struct page *page, 364 enum mem_cgroup_page_stat_item idx) 365 { 366 } 367 368 static inline 369 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, 370 gfp_t gfp_mask, 371 unsigned long *total_scanned) 372 { 373 return 0; 374 } 375 376 static inline 377 u64 mem_cgroup_get_limit(struct mem_cgroup *mem) 378 { 379 return 0; 380 } 381 382 static inline void mem_cgroup_split_huge_fixup(struct page *head, 383 struct page *tail) 384 { 385 } 386 387 static inline 388 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) 389 { 390 } 391 #endif /* CONFIG_CGROUP_MEM_CONT */ 392 393 #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM) 394 static inline bool 395 mem_cgroup_bad_page_check(struct page *page) 396 { 397 return false; 398 } 399 400 static inline void 401 mem_cgroup_print_bad_page(struct page *page) 402 { 403 } 404 #endif 405 406 #endif /* _LINUX_MEMCONTROL_H */ 407 408