release/src-rt-6.x.4708/linux/linux-2.6.36/include/linux/memcontrol.h

   1 /* memcontrol.h - Memory Controller
   2  *
   3  * Copyright IBM Corporation, 2007
   4  * Author Balbir Singh <balbir@linux.vnet.ibm.com>
   5  *
   6  * Copyright 2007 OpenVZ SWsoft Inc
   7  * Author: Pavel Emelianov <xemul@openvz.org>
   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 */