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 #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(struct mm_struct *mm,
  44                 gfp_t gfp_mask, struct mem_cgroup **ptr);
  45 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  46                 struct page *page, gfp_t mask, struct mem_cgroup **ptr);
  47 extern void mem_cgroup_commit_charge_swapin(struct page *page,
  48                                         struct mem_cgroup *ptr);
  49 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
  50
  51 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  52                                         gfp_t gfp_mask);
  53 extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  54 extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  55 extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  56 extern void mem_cgroup_del_lru(struct page *page);
  57 extern void mem_cgroup_move_lists(struct page *page,
  58                                   enum lru_list from, enum lru_list to);
  59 extern void mem_cgroup_uncharge_page(struct page *page);
  60 extern void mem_cgroup_uncharge_cache_page(struct page *page);
  61 extern int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask);
  62
  63 extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  64                                         struct list_head *dst,
  65                                         unsigned long *scanned, int order,
  66                                         int mode, struct zone *z,
  67                                         struct mem_cgroup *mem_cont,
  68                                         int active, int file);
  69 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
  70 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
  71
  72 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
  73
  74 static inline
  75 int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  76 {
  77         struct mem_cgroup *mem;
  78         rcu_read_lock();
  79         mem = mem_cgroup_from_task((mm)->owner);
  80         rcu_read_unlock();
  81         return cgroup == mem;
  82 }
  83
  84 extern int
  85 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
  86 extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
  87         struct page *oldpage, struct page *newpage);
  88
  89 /*
  90  * For memory reclaim.
  91  */
  92 extern int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem);
  93 extern long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem);
  94
  95 extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
  96 extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
  97                                                         int priority);
  98 extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
  99                                                         int priority);
 100
 101 extern long mem_cgroup_calc_reclaim(struct mem_cgroup *mem, struct zone *zone,
 102                                         int priority, enum lru_list lru);
 103 int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg,
 104                                     struct zone *zone);
 105 unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
 106                                        struct zone *zone,
 107                                        enum lru_list lru);
 108
 109 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
 110 extern int do_swap_account;
 111 #endif
 112
 113 static inline bool mem_cgroup_disabled(void)
 114 {
 115         if (mem_cgroup_subsys.disabled)
 116                 return true;
 117         return false;
 118 }
 119
 120 extern bool mem_cgroup_oom_called(struct task_struct *task);
 121
 122 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 123 struct mem_cgroup;
 124
 125 static inline int mem_cgroup_newpage_charge(struct page *page,
 126                                         struct mm_struct *mm, gfp_t gfp_mask)
 127 {
 128         return 0;
 129 }
 130
 131 static inline int mem_cgroup_cache_charge(struct page *page,
 132                                         struct mm_struct *mm, gfp_t gfp_mask)
 133 {
 134         return 0;
 135 }
 136
 137 static inline int mem_cgroup_try_charge(struct mm_struct *mm,
 138                         gfp_t gfp_mask, struct mem_cgroup **ptr)
 139 {
 140         return 0;
 141 }
 142
 143 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 144                 struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
 145 {
 146         return 0;
 147 }
 148
 149 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 150                                           struct mem_cgroup *ptr)
 151 {
 152 }
 153
 154 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
 155 {
 156 }
 157
 158 static inline void mem_cgroup_uncharge_page(struct page *page)
 159 {
 160 }
 161
 162 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 163 {
 164 }
 165
 166 static inline int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask)
 167 {
 168         return 0;
 169 }
 170
 171 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 172 {
 173 }
 174
 175 static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
 176 {
 177         return ;
 178 }
 179
 180 static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
 181 {
 182         return ;
 183 }
 184
 185 static inline void mem_cgroup_del_lru(struct page *page)
 186 {
 187         return ;
 188 }
 189
 190 static inline void
 191 mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)
 192 {
 193 }
 194
 195 static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
 196 {
 197         return 1;
 198 }
 199
 200 static inline int task_in_mem_cgroup(struct task_struct *task,
 201                                      const struct mem_cgroup *mem)
 202 {
 203         return 1;
 204 }
 205
 206 static inline int
 207 mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
 208 {
 209         return 0;
 210 }
 211
 212 static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
 213                                         struct page *oldpage,
 214                                         struct page *newpage)
 215 {
 216 }
 217
 218 static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
 219 {
 220         return 0;
 221 }
 222
 223 static inline int mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem)
 224 {
 225         return 0;
 226 }
 227
 228 static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
 229 {
 230         return 0;
 231 }
 232
 233 static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
 234                                                 int priority)
 235 {
 236 }
 237
 238 static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
 239                                                 int priority)
 240 {
 241 }
 242
 243 static inline long mem_cgroup_calc_reclaim(struct mem_cgroup *mem,
 244                                         struct zone *zone, int priority,
 245                                         enum lru_list lru)
 246 {
 247         return 0;
 248 }
 249
 250 static inline bool mem_cgroup_disabled(void)
 251 {
 252         return true;
 253 }
 254
 255 static inline bool mem_cgroup_oom_called(struct task_struct *task)
 256 {
 257         return false;
 258 }
 259
 260 static inline int
 261 mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
 262 {
 263         return 1;
 264 }
 265
 266 static inline unsigned long
 267 mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
 268                          enum lru_list lru)
 269 {
 270         return 0;
 271 }
 272
 273
 274 #endif /* CONFIG_CGROUP_MEM_CONT */
 275
 276 #endif /* _LINUX_MEMCONTROL_H */
 277