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 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg); 102 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg); 103 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, 104 struct zone *zone, 105 enum lru_list lru); 106 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, 107 struct zone *zone); 108 struct zone_reclaim_stat* 109 mem_cgroup_get_reclaim_stat_from_page(struct page *page); 110 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, 111 struct task_struct *p); 112 113 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP 114 extern int do_swap_account; 115 #endif 116 117 static inline bool mem_cgroup_disabled(void) 118 { 119 if (mem_cgroup_subsys.disabled) 120 return true; 121 return false; 122 } 123 124 void mem_cgroup_update_file_mapped(struct page *page, int val); 125 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, 126 gfp_t gfp_mask); 127 u64 mem_cgroup_get_limit(struct mem_cgroup *mem); 128 129 #else /* CONFIG_CGROUP_MEM_RES_CTLR */ 130 struct mem_cgroup; 131 132 static inline int mem_cgroup_newpage_charge(struct page *page, 133 struct mm_struct *mm, gfp_t gfp_mask) 134 { 135 return 0; 136 } 137 138 static inline int mem_cgroup_cache_charge(struct page *page, 139 struct mm_struct *mm, gfp_t gfp_mask) 140 { 141 return 0; 142 } 143 144 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 145 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr) 146 { 147 return 0; 148 } 149 150 static inline void mem_cgroup_commit_charge_swapin(struct page *page, 151 struct mem_cgroup *ptr) 152 { 153 } 154 155 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr) 156 { 157 } 158 159 static inline void mem_cgroup_uncharge_start(void) 160 { 161 } 162 163 static inline void mem_cgroup_uncharge_end(void) 164 { 165 } 166 167 static inline void mem_cgroup_uncharge_page(struct page *page) 168 { 169 } 170 171 static inline void mem_cgroup_uncharge_cache_page(struct page *page) 172 { 173 } 174 175 static inline int mem_cgroup_shmem_charge_fallback(struct page *page, 176 struct mm_struct *mm, gfp_t gfp_mask) 177 { 178 return 0; 179 } 180 181 static inline void mem_cgroup_add_lru_list(struct page *page, int lru) 182 { 183 } 184 185 static inline void mem_cgroup_del_lru_list(struct page *page, int lru) 186 { 187 return ; 188 } 189 190 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru) 191 { 192 return ; 193 } 194 195 static inline void mem_cgroup_del_lru(struct page *page) 196 { 197 return ; 198 } 199 200 static inline void 201 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to) 202 { 203 } 204 205 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) 206 { 207 return NULL; 208 } 209 210 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem) 211 { 212 return 1; 213 } 214 215 static inline int task_in_mem_cgroup(struct task_struct *task, 216 const struct mem_cgroup *mem) 217 { 218 return 1; 219 } 220 221 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem) 222 { 223 return NULL; 224 } 225 226 static inline int 227 mem_cgroup_prepare_migration(struct page *page, struct page *newpage, 228 struct mem_cgroup **ptr) 229 { 230 return 0; 231 } 232 233 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem, 234 struct page *oldpage, 235 struct page *newpage) 236 { 237 } 238 239 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) 240 { 241 return 0; 242 } 243 244 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, 245 int priority) 246 { 247 } 248 249 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 250 int priority) 251 { 252 } 253 254 static inline bool mem_cgroup_disabled(void) 255 { 256 return true; 257 } 258 259 static inline int 260 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg) 261 { 262 return 1; 263 } 264 265 static inline int 266 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg) 267 { 268 return 1; 269 } 270 271 static inline unsigned long 272 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone, 273 enum lru_list lru) 274 { 275 return 0; 276 } 277 278 279 static inline struct zone_reclaim_stat* 280 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone) 281 { 282 return NULL; 283 } 284 285 static inline struct zone_reclaim_stat* 286 mem_cgroup_get_reclaim_stat_from_page(struct page *page) 287 { 288 return NULL; 289 } 290 291 static inline void 292 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) 293 { 294 } 295 296 static inline void mem_cgroup_update_file_mapped(struct page *page, 297 int val) 298 { 299 } 300 301 static inline 302 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, 303 gfp_t gfp_mask) 304 { 305 return 0; 306 } 307 308 static inline 309 u64 mem_cgroup_get_limit(struct mem_cgroup *mem) 310 { 311 return 0; 312 } 313 314 #endif /* CONFIG_CGROUP_MEM_CONT */ 315 316 #endif /* _LINUX_MEMCONTROL_H */ 317 318