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 extern void mem_cgroup_uncharge_page(struct page *page); 58 extern void mem_cgroup_uncharge_cache_page(struct page *page); 59 extern int mem_cgroup_shmem_charge_fallback(struct page *page, 60 struct mm_struct *mm, gfp_t gfp_mask); 61 62 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, 63 struct list_head *dst, 64 unsigned long *scanned, int order, 65 int mode, struct zone *z, 66 struct mem_cgroup *mem_cont, 67 int active, int file); 68 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask); 69 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem); 70 71 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); 72 73 static inline 74 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup) 75 { 76 struct mem_cgroup *mem; 77 rcu_read_lock(); 78 mem = mem_cgroup_from_task(rcu_dereference((mm)->owner)); 79 rcu_read_unlock(); 80 return cgroup == mem; 81 } 82 83 extern int 84 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr); 85 extern void mem_cgroup_end_migration(struct mem_cgroup *mem, 86 struct page *oldpage, struct page *newpage); 87 88 /* 89 * For memory reclaim. 90 */ 91 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem); 92 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, 93 int priority); 94 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 95 int priority); 96 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg); 97 int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg); 98 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, 99 struct zone *zone, 100 enum lru_list lru); 101 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, 102 struct zone *zone); 103 struct zone_reclaim_stat* 104 mem_cgroup_get_reclaim_stat_from_page(struct page *page); 105 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, 106 struct task_struct *p); 107 108 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP 109 extern int do_swap_account; 110 #endif 111 112 static inline bool mem_cgroup_disabled(void) 113 { 114 if (mem_cgroup_subsys.disabled) 115 return true; 116 return false; 117 } 118 119 extern bool mem_cgroup_oom_called(struct task_struct *task); 120 void mem_cgroup_update_mapped_file_stat(struct page *page, int val); 121 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, 122 gfp_t gfp_mask, int nid, 123 int zid); 124 #else /* CONFIG_CGROUP_MEM_RES_CTLR */ 125 struct mem_cgroup; 126 127 static inline int mem_cgroup_newpage_charge(struct page *page, 128 struct mm_struct *mm, gfp_t gfp_mask) 129 { 130 return 0; 131 } 132 133 static inline int mem_cgroup_cache_charge(struct page *page, 134 struct mm_struct *mm, gfp_t gfp_mask) 135 { 136 return 0; 137 } 138 139 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 140 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr) 141 { 142 return 0; 143 } 144 145 static inline void mem_cgroup_commit_charge_swapin(struct page *page, 146 struct mem_cgroup *ptr) 147 { 148 } 149 150 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr) 151 { 152 } 153 154 static inline void mem_cgroup_uncharge_page(struct page *page) 155 { 156 } 157 158 static inline void mem_cgroup_uncharge_cache_page(struct page *page) 159 { 160 } 161 162 static inline int mem_cgroup_shmem_charge_fallback(struct page *page, 163 struct mm_struct *mm, gfp_t gfp_mask) 164 { 165 return 0; 166 } 167 168 static inline void mem_cgroup_add_lru_list(struct page *page, int lru) 169 { 170 } 171 172 static inline void mem_cgroup_del_lru_list(struct page *page, int lru) 173 { 174 return ; 175 } 176 177 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru) 178 { 179 return ; 180 } 181 182 static inline void mem_cgroup_del_lru(struct page *page) 183 { 184 return ; 185 } 186 187 static inline void 188 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to) 189 { 190 } 191 192 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem) 193 { 194 return 1; 195 } 196 197 static inline int task_in_mem_cgroup(struct task_struct *task, 198 const struct mem_cgroup *mem) 199 { 200 return 1; 201 } 202 203 static inline int 204 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr) 205 { 206 return 0; 207 } 208 209 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem, 210 struct page *oldpage, 211 struct page *newpage) 212 { 213 } 214 215 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) 216 { 217 return 0; 218 } 219 220 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, 221 int priority) 222 { 223 } 224 225 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 226 int priority) 227 { 228 } 229 230 static inline bool mem_cgroup_disabled(void) 231 { 232 return true; 233 } 234 235 static inline bool mem_cgroup_oom_called(struct task_struct *task) 236 { 237 return false; 238 } 239 240 static inline int 241 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg) 242 { 243 return 1; 244 } 245 246 static inline int 247 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg) 248 { 249 return 1; 250 } 251 252 static inline unsigned long 253 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone, 254 enum lru_list lru) 255 { 256 return 0; 257 } 258 259 260 static inline struct zone_reclaim_stat* 261 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone) 262 { 263 return NULL; 264 } 265 266 static inline struct zone_reclaim_stat* 267 mem_cgroup_get_reclaim_stat_from_page(struct page *page) 268 { 269 return NULL; 270 } 271 272 static inline void 273 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) 274 { 275 } 276 277 static inline void mem_cgroup_update_mapped_file_stat(struct page *page, 278 int val) 279 { 280 } 281 282 static inline 283 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, 284 gfp_t gfp_mask, int nid, int zid) 285 { 286 return 0; 287 } 288 289 #endif /* CONFIG_CGROUP_MEM_CONT */ 290 291 #endif /* _LINUX_MEMCONTROL_H */ 292 293