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 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, 98 struct zone *zone, 99 enum lru_list lru); 100 struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, 101 struct zone *zone); 102 struct zone_reclaim_stat* 103 mem_cgroup_get_reclaim_stat_from_page(struct page *page); 104 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, 105 struct task_struct *p); 106 107 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP 108 extern int do_swap_account; 109 #endif 110 111 static inline bool mem_cgroup_disabled(void) 112 { 113 if (mem_cgroup_subsys.disabled) 114 return true; 115 return false; 116 } 117 118 extern bool mem_cgroup_oom_called(struct task_struct *task); 119 120 #else /* CONFIG_CGROUP_MEM_RES_CTLR */ 121 struct mem_cgroup; 122 123 static inline int mem_cgroup_newpage_charge(struct page *page, 124 struct mm_struct *mm, gfp_t gfp_mask) 125 { 126 return 0; 127 } 128 129 static inline int mem_cgroup_cache_charge(struct page *page, 130 struct mm_struct *mm, gfp_t gfp_mask) 131 { 132 return 0; 133 } 134 135 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 136 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr) 137 { 138 return 0; 139 } 140 141 static inline void mem_cgroup_commit_charge_swapin(struct page *page, 142 struct mem_cgroup *ptr) 143 { 144 } 145 146 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr) 147 { 148 } 149 150 static inline void mem_cgroup_uncharge_page(struct page *page) 151 { 152 } 153 154 static inline void mem_cgroup_uncharge_cache_page(struct page *page) 155 { 156 } 157 158 static inline int mem_cgroup_shmem_charge_fallback(struct page *page, 159 struct mm_struct *mm, gfp_t gfp_mask) 160 { 161 return 0; 162 } 163 164 static inline void mem_cgroup_add_lru_list(struct page *page, int lru) 165 { 166 } 167 168 static inline void mem_cgroup_del_lru_list(struct page *page, int lru) 169 { 170 return ; 171 } 172 173 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru) 174 { 175 return ; 176 } 177 178 static inline void mem_cgroup_del_lru(struct page *page) 179 { 180 return ; 181 } 182 183 static inline void 184 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to) 185 { 186 } 187 188 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem) 189 { 190 return 1; 191 } 192 193 static inline int task_in_mem_cgroup(struct task_struct *task, 194 const struct mem_cgroup *mem) 195 { 196 return 1; 197 } 198 199 static inline int 200 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr) 201 { 202 return 0; 203 } 204 205 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem, 206 struct page *oldpage, 207 struct page *newpage) 208 { 209 } 210 211 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) 212 { 213 return 0; 214 } 215 216 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, 217 int priority) 218 { 219 } 220 221 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, 222 int priority) 223 { 224 } 225 226 static inline bool mem_cgroup_disabled(void) 227 { 228 return true; 229 } 230 231 static inline bool mem_cgroup_oom_called(struct task_struct *task) 232 { 233 return false; 234 } 235 236 static inline int 237 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg) 238 { 239 return 1; 240 } 241 242 static inline unsigned long 243 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone, 244 enum lru_list lru) 245 { 246 return 0; 247 } 248 249 250 static inline struct zone_reclaim_stat* 251 mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone) 252 { 253 return NULL; 254 } 255 256 static inline struct zone_reclaim_stat* 257 mem_cgroup_get_reclaim_stat_from_page(struct page *page) 258 { 259 return NULL; 260 } 261 262 static inline void 263 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) 264 { 265 } 266 267 #endif /* CONFIG_CGROUP_MEM_CONT */ 268 269 #endif /* _LINUX_MEMCONTROL_H */ 270 271