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 #else /* CONFIG_CGROUP_MEM_RES_CTLR */ 122 struct mem_cgroup; 123 124 static inline int mem_cgroup_newpage_charge(struct page *page, 125 struct mm_struct *mm, gfp_t gfp_mask) 126 { 127 return 0; 128 } 129 130 static inline int mem_cgroup_cache_charge(struct page *page, 131 struct mm_struct *mm, gfp_t gfp_mask) 132 { 133 return 0; 134 } 135 136 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 137 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr) 138 { 139 return 0; 140 } 141 142 static inline void mem_cgroup_commit_charge_swapin(struct page *page, 143 struct mem_cgroup *ptr) 144 { 145 } 146 147 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr) 148 { 149 } 150 151 static inline void mem_cgroup_uncharge_page(struct page *page) 152 { 153 } 154 155 static inline void mem_cgroup_uncharge_cache_page(struct page *page) 156 { 157 } 158 159 static inline int mem_cgroup_shmem_charge_fallback(struct page *page, 160 struct mm_struct *mm, gfp_t gfp_mask) 161 { 162 return 0; 163 } 164 165 static inline void mem_cgroup_add_lru_list(struct page *page, int lru) 166 { 167 } 168 169 static inline void mem_cgroup_del_lru_list(struct page *page, int lru) 170 { 171 return ; 172 } 173 174 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru) 175 { 176 return ; 177 } 178 179 static inline void mem_cgroup_del_lru(struct page *page) 180 { 181 return ; 182 } 183 184 static inline void 185 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to) 186 { 187 } 188 189 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem) 190 { 191 return 1; 192 } 193 194 static inline int task_in_mem_cgroup(struct task_struct *task, 195 const struct mem_cgroup *mem) 196 { 197 return 1; 198 } 199 200 static inline int 201 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr) 202 { 203 return 0; 204 } 205 206 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem, 207 struct page *oldpage, 208 struct page *newpage) 209 { 210 } 211 212 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) 213 { 214 return 0; 215 } 216 217 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, 218 int priority) 219 { 220 } 221 222 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 223 int priority) 224 { 225 } 226 227 static inline bool mem_cgroup_disabled(void) 228 { 229 return true; 230 } 231 232 static inline bool mem_cgroup_oom_called(struct task_struct *task) 233 { 234 return false; 235 } 236 237 static inline int 238 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg) 239 { 240 return 1; 241 } 242 243 static inline int 244 mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg) 245 { 246 return 1; 247 } 248 249 static inline unsigned long 250 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone, 251 enum lru_list lru) 252 { 253 return 0; 254 } 255 256 257 static inline struct zone_reclaim_stat* 258 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone) 259 { 260 return NULL; 261 } 262 263 static inline struct zone_reclaim_stat* 264 mem_cgroup_get_reclaim_stat_from_page(struct page *page) 265 { 266 return NULL; 267 } 268 269 static inline void 270 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) 271 { 272 } 273 274 static inline void mem_cgroup_update_mapped_file_stat(struct page *page, 275 int val) 276 { 277 } 278 279 #endif /* CONFIG_CGROUP_MEM_CONT */ 280 281 #endif /* _LINUX_MEMCONTROL_H */ 282 283