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 struct mem_cgroup; 24 struct page_cgroup; 25 struct page; 26 struct mm_struct; 27 28 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, 29 struct list_head *dst, 30 unsigned long *scanned, int order, 31 int mode, struct zone *z, 32 struct mem_cgroup *mem_cont, 33 int active, int file); 34 35 #ifdef CONFIG_CGROUP_MEM_RES_CTLR 36 /* 37 * All "charge" functions with gfp_mask should use GFP_KERNEL or 38 * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't 39 * alloc memory but reclaims memory from all available zones. So, "where I want 40 * memory from" bits of gfp_mask has no meaning. So any bits of that field is 41 * available but adding a rule is better. charge functions' gfp_mask should 42 * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous 43 * codes. 44 * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.) 45 */ 46 47 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm, 48 gfp_t gfp_mask); 49 /* for swap handling */ 50 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 51 struct page *page, gfp_t mask, struct mem_cgroup **ptr); 52 extern void mem_cgroup_commit_charge_swapin(struct page *page, 53 struct mem_cgroup *ptr); 54 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr); 55 56 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, 57 gfp_t gfp_mask); 58 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru); 59 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru); 60 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru); 61 extern void mem_cgroup_del_lru(struct page *page); 62 extern void mem_cgroup_move_lists(struct page *page, 63 enum lru_list from, enum lru_list to); 64 65 /* For coalescing uncharge for reducing memcg' overhead*/ 66 extern void mem_cgroup_uncharge_start(void); 67 extern void mem_cgroup_uncharge_end(void); 68 69 extern void mem_cgroup_uncharge_page(struct page *page); 70 extern void mem_cgroup_uncharge_cache_page(struct page *page); 71 extern int mem_cgroup_shmem_charge_fallback(struct page *page, 72 struct mm_struct *mm, gfp_t gfp_mask); 73 74 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask); 75 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem); 76 77 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); 78 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); 79 80 static inline 81 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup) 82 { 83 struct mem_cgroup *mem; 84 rcu_read_lock(); 85 mem = mem_cgroup_from_task(rcu_dereference((mm)->owner)); 86 rcu_read_unlock(); 87 return cgroup == mem; 88 } 89 90 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem); 91 92 extern int 93 mem_cgroup_prepare_migration(struct page *page, 94 struct page *newpage, struct mem_cgroup **ptr); 95 extern void mem_cgroup_end_migration(struct mem_cgroup *mem, 96 struct page *oldpage, struct page *newpage); 97 98 /* 99 * For memory reclaim. 100 */ 101 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem); 102 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, 103 int priority); 104 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 105 int priority); 106 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg); 107 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg); 108 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, 109 struct zone *zone, 110 enum lru_list lru); 111 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, 112 struct zone *zone); 113 struct zone_reclaim_stat* 114 mem_cgroup_get_reclaim_stat_from_page(struct page *page); 115 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, 116 struct task_struct *p); 117 118 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP 119 extern int do_swap_account; 120 #endif 121 122 static inline bool mem_cgroup_disabled(void) 123 { 124 if (mem_cgroup_subsys.disabled) 125 return true; 126 return false; 127 } 128 129 void mem_cgroup_update_file_mapped(struct page *page, int val); 130 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, 131 gfp_t gfp_mask, int nid, 132 int zid); 133 #else /* CONFIG_CGROUP_MEM_RES_CTLR */ 134 struct mem_cgroup; 135 136 static inline int mem_cgroup_newpage_charge(struct page *page, 137 struct mm_struct *mm, gfp_t gfp_mask) 138 { 139 return 0; 140 } 141 142 static inline int mem_cgroup_cache_charge(struct page *page, 143 struct mm_struct *mm, gfp_t gfp_mask) 144 { 145 return 0; 146 } 147 148 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 149 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr) 150 { 151 return 0; 152 } 153 154 static inline void mem_cgroup_commit_charge_swapin(struct page *page, 155 struct mem_cgroup *ptr) 156 { 157 } 158 159 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr) 160 { 161 } 162 163 static inline void mem_cgroup_uncharge_start(void) 164 { 165 } 166 167 static inline void mem_cgroup_uncharge_end(void) 168 { 169 } 170 171 static inline void mem_cgroup_uncharge_page(struct page *page) 172 { 173 } 174 175 static inline void mem_cgroup_uncharge_cache_page(struct page *page) 176 { 177 } 178 179 static inline int mem_cgroup_shmem_charge_fallback(struct page *page, 180 struct mm_struct *mm, gfp_t gfp_mask) 181 { 182 return 0; 183 } 184 185 static inline void mem_cgroup_add_lru_list(struct page *page, int lru) 186 { 187 } 188 189 static inline void mem_cgroup_del_lru_list(struct page *page, int lru) 190 { 191 return ; 192 } 193 194 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru) 195 { 196 return ; 197 } 198 199 static inline void mem_cgroup_del_lru(struct page *page) 200 { 201 return ; 202 } 203 204 static inline void 205 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to) 206 { 207 } 208 209 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) 210 { 211 return NULL; 212 } 213 214 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem) 215 { 216 return 1; 217 } 218 219 static inline int task_in_mem_cgroup(struct task_struct *task, 220 const struct mem_cgroup *mem) 221 { 222 return 1; 223 } 224 225 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem) 226 { 227 return NULL; 228 } 229 230 static inline int 231 mem_cgroup_prepare_migration(struct page *page, struct page *newpage, 232 struct mem_cgroup **ptr) 233 { 234 return 0; 235 } 236 237 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem, 238 struct page *oldpage, 239 struct page *newpage) 240 { 241 } 242 243 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) 244 { 245 return 0; 246 } 247 248 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, 249 int priority) 250 { 251 } 252 253 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 254 int priority) 255 { 256 } 257 258 static inline bool mem_cgroup_disabled(void) 259 { 260 return true; 261 } 262 263 static inline int 264 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg) 265 { 266 return 1; 267 } 268 269 static inline int 270 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg) 271 { 272 return 1; 273 } 274 275 static inline unsigned long 276 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone, 277 enum lru_list lru) 278 { 279 return 0; 280 } 281 282 283 static inline struct zone_reclaim_stat* 284 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone) 285 { 286 return NULL; 287 } 288 289 static inline struct zone_reclaim_stat* 290 mem_cgroup_get_reclaim_stat_from_page(struct page *page) 291 { 292 return NULL; 293 } 294 295 static inline void 296 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) 297 { 298 } 299 300 static inline void mem_cgroup_update_file_mapped(struct page *page, 301 int val) 302 { 303 } 304 305 static inline 306 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, 307 gfp_t gfp_mask, int nid, int zid) 308 { 309 return 0; 310 } 311 312 #endif /* CONFIG_CGROUP_MEM_CONT */ 313 314 #endif /* _LINUX_MEMCONTROL_H */ 315 316