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 #ifdef CONFIG_CGROUP_MEM_RES_CTLR 29 /* 30 * All "charge" functions with gfp_mask should use GFP_KERNEL or 31 * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't 32 * alloc memory but reclaims memory from all available zones. So, "where I want 33 * memory from" bits of gfp_mask has no meaning. So any bits of that field is 34 * available but adding a rule is better. charge functions' gfp_mask should 35 * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous 36 * codes. 37 * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.) 38 */ 39 40 extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm, 41 gfp_t gfp_mask); 42 /* for swap handling */ 43 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 44 struct page *page, gfp_t mask, struct mem_cgroup **ptr); 45 extern void mem_cgroup_commit_charge_swapin(struct page *page, 46 struct mem_cgroup *ptr); 47 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr); 48 49 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, 50 gfp_t gfp_mask); 51 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru); 52 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru); 53 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru); 54 extern void mem_cgroup_del_lru(struct page *page); 55 extern void mem_cgroup_move_lists(struct page *page, 56 enum lru_list from, enum lru_list to); 57 58 /* For coalescing uncharge for reducing memcg' overhead*/ 59 extern void mem_cgroup_uncharge_start(void); 60 extern void mem_cgroup_uncharge_end(void); 61 62 extern void mem_cgroup_uncharge_page(struct page *page); 63 extern void mem_cgroup_uncharge_cache_page(struct page *page); 64 extern int mem_cgroup_shmem_charge_fallback(struct page *page, 65 struct mm_struct *mm, gfp_t gfp_mask); 66 67 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, 68 struct list_head *dst, 69 unsigned long *scanned, int order, 70 int mode, struct zone *z, 71 struct mem_cgroup *mem_cont, 72 int active, int file); 73 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask); 74 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem); 75 76 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); 77 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); 78 79 static inline 80 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup) 81 { 82 struct mem_cgroup *mem; 83 rcu_read_lock(); 84 mem = mem_cgroup_from_task(rcu_dereference((mm)->owner)); 85 rcu_read_unlock(); 86 return cgroup == mem; 87 } 88 89 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem); 90 91 extern int 92 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr); 93 extern void mem_cgroup_end_migration(struct mem_cgroup *mem, 94 struct page *oldpage, struct page *newpage); 95 96 /* 97 * For memory reclaim. 98 */ 99 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem); 100 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, 101 int priority); 102 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 103 int priority); 104 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg); 105 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg); 106 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, 107 struct zone *zone, 108 enum lru_list lru); 109 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, 110 struct zone *zone); 111 struct zone_reclaim_stat* 112 mem_cgroup_get_reclaim_stat_from_page(struct page *page); 113 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, 114 struct task_struct *p); 115 116 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP 117 extern int do_swap_account; 118 #endif 119 120 static inline bool mem_cgroup_disabled(void) 121 { 122 if (mem_cgroup_subsys.disabled) 123 return true; 124 return false; 125 } 126 127 extern bool mem_cgroup_oom_called(struct task_struct *task); 128 void mem_cgroup_update_file_mapped(struct page *page, int val); 129 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, 130 gfp_t gfp_mask, int nid, 131 int zid); 132 #else /* CONFIG_CGROUP_MEM_RES_CTLR */ 133 struct mem_cgroup; 134 135 static inline int mem_cgroup_newpage_charge(struct page *page, 136 struct mm_struct *mm, gfp_t gfp_mask) 137 { 138 return 0; 139 } 140 141 static inline int mem_cgroup_cache_charge(struct page *page, 142 struct mm_struct *mm, gfp_t gfp_mask) 143 { 144 return 0; 145 } 146 147 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 148 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr) 149 { 150 return 0; 151 } 152 153 static inline void mem_cgroup_commit_charge_swapin(struct page *page, 154 struct mem_cgroup *ptr) 155 { 156 } 157 158 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr) 159 { 160 } 161 162 static inline void mem_cgroup_uncharge_start(void) 163 { 164 } 165 166 static inline void mem_cgroup_uncharge_end(void) 167 { 168 } 169 170 static inline void mem_cgroup_uncharge_page(struct page *page) 171 { 172 } 173 174 static inline void mem_cgroup_uncharge_cache_page(struct page *page) 175 { 176 } 177 178 static inline int mem_cgroup_shmem_charge_fallback(struct page *page, 179 struct mm_struct *mm, gfp_t gfp_mask) 180 { 181 return 0; 182 } 183 184 static inline void mem_cgroup_add_lru_list(struct page *page, int lru) 185 { 186 } 187 188 static inline void mem_cgroup_del_lru_list(struct page *page, int lru) 189 { 190 return ; 191 } 192 193 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru) 194 { 195 return ; 196 } 197 198 static inline void mem_cgroup_del_lru(struct page *page) 199 { 200 return ; 201 } 202 203 static inline void 204 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to) 205 { 206 } 207 208 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) 209 { 210 return NULL; 211 } 212 213 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem) 214 { 215 return 1; 216 } 217 218 static inline int task_in_mem_cgroup(struct task_struct *task, 219 const struct mem_cgroup *mem) 220 { 221 return 1; 222 } 223 224 static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem) 225 { 226 return NULL; 227 } 228 229 static inline int 230 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr) 231 { 232 return 0; 233 } 234 235 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem, 236 struct page *oldpage, 237 struct page *newpage) 238 { 239 } 240 241 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) 242 { 243 return 0; 244 } 245 246 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, 247 int priority) 248 { 249 } 250 251 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 252 int priority) 253 { 254 } 255 256 static inline bool mem_cgroup_disabled(void) 257 { 258 return true; 259 } 260 261 static inline bool mem_cgroup_oom_called(struct task_struct *task) 262 { 263 return false; 264 } 265 266 static inline int 267 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg) 268 { 269 return 1; 270 } 271 272 static inline int 273 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg) 274 { 275 return 1; 276 } 277 278 static inline unsigned long 279 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone, 280 enum lru_list lru) 281 { 282 return 0; 283 } 284 285 286 static inline struct zone_reclaim_stat* 287 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone) 288 { 289 return NULL; 290 } 291 292 static inline struct zone_reclaim_stat* 293 mem_cgroup_get_reclaim_stat_from_page(struct page *page) 294 { 295 return NULL; 296 } 297 298 static inline void 299 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) 300 { 301 } 302 303 static inline void mem_cgroup_update_file_mapped(struct page *page, 304 int val) 305 { 306 } 307 308 static inline 309 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, 310 gfp_t gfp_mask, int nid, int zid) 311 { 312 return 0; 313 } 314 315 #endif /* CONFIG_CGROUP_MEM_CONT */ 316 317 #endif /* _LINUX_MEMCONTROL_H */ 318 319