include/linux/hugetlb_cgroup.h

   1 /*
   2  * Copyright IBM Corporation, 2012
   3  * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2.1 of the GNU Lesser General Public License
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12  *
  13  */
  14
  15 #ifndef _LINUX_HUGETLB_CGROUP_H
  16 #define _LINUX_HUGETLB_CGROUP_H
  17
  18 #include <linux/mmdebug.h>
  19
  20 struct hugetlb_cgroup;
  21 struct resv_map;
  22 struct file_region;
  23
  24 /*
  25  * Minimum page order trackable by hugetlb cgroup.
  26  * At least 4 pages are necessary for all the tracking information.
  27  * The second tail page (hpage[2]) is the fault usage cgroup.
  28  * The third tail page (hpage[3]) is the reservation usage cgroup.
  29  */
  30 #define HUGETLB_CGROUP_MIN_ORDER        2
  31
  32 #ifdef CONFIG_CGROUP_HUGETLB
  33 enum hugetlb_memory_event {
  34         HUGETLB_MAX,
  35         HUGETLB_NR_MEMORY_EVENTS,
  36 };
  37
  38 struct hugetlb_cgroup {
  39         struct cgroup_subsys_state css;
  40
  41         /*
  42          * the counter to account for hugepages from hugetlb.
  43          */
  44         struct page_counter hugepage[HUGE_MAX_HSTATE];
  45
  46         /*
  47          * the counter to account for hugepage reservations from hugetlb.
  48          */
  49         struct page_counter rsvd_hugepage[HUGE_MAX_HSTATE];
  50
  51         atomic_long_t events[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
  52         atomic_long_t events_local[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
  53
  54         /* Handle for "hugetlb.events" */
  55         struct cgroup_file events_file[HUGE_MAX_HSTATE];
  56
  57         /* Handle for "hugetlb.events.local" */
  58         struct cgroup_file events_local_file[HUGE_MAX_HSTATE];
  59 };
  60
  61 static inline struct hugetlb_cgroup *
  62 __hugetlb_cgroup_from_page(struct page *page, bool rsvd)
  63 {
  64         VM_BUG_ON_PAGE(!PageHuge(page), page);
  65
  66         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  67                 return NULL;
  68         if (rsvd)
  69                 return (struct hugetlb_cgroup *)page[3].private;
  70         else
  71                 return (struct hugetlb_cgroup *)page[2].private;
  72 }
  73
  74 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
  75 {
  76         return __hugetlb_cgroup_from_page(page, false);
  77 }
  78
  79 static inline struct hugetlb_cgroup *
  80 hugetlb_cgroup_from_page_rsvd(struct page *page)
  81 {
  82         return __hugetlb_cgroup_from_page(page, true);
  83 }
  84
  85 static inline int __set_hugetlb_cgroup(struct page *page,
  86                                        struct hugetlb_cgroup *h_cg, bool rsvd)
  87 {
  88         VM_BUG_ON_PAGE(!PageHuge(page), page);
  89
  90         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  91                 return -1;
  92         if (rsvd)
  93                 page[3].private = (unsigned long)h_cg;
  94         else
  95                 page[2].private = (unsigned long)h_cg;
  96         return 0;
  97 }
  98
  99 static inline int set_hugetlb_cgroup(struct page *page,
 100                                      struct hugetlb_cgroup *h_cg)
 101 {
 102         return __set_hugetlb_cgroup(page, h_cg, false);
 103 }
 104
 105 static inline int set_hugetlb_cgroup_rsvd(struct page *page,
 106                                           struct hugetlb_cgroup *h_cg)
 107 {
 108         return __set_hugetlb_cgroup(page, h_cg, true);
 109 }
 110
 111 static inline bool hugetlb_cgroup_disabled(void)
 112 {
 113         return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
 114 }
 115
 116 static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
 117 {
 118         css_put(&h_cg->css);
 119 }
 120
 121 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
 122                                         struct hugetlb_cgroup **ptr);
 123 extern int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
 124                                              struct hugetlb_cgroup **ptr);
 125 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
 126                                          struct hugetlb_cgroup *h_cg,
 127                                          struct page *page);
 128 extern void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
 129                                               struct hugetlb_cgroup *h_cg,
 130                                               struct page *page);
 131 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
 132                                          struct page *page);
 133 extern void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages,
 134                                               struct page *page);
 135
 136 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
 137                                            struct hugetlb_cgroup *h_cg);
 138 extern void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
 139                                                 struct hugetlb_cgroup *h_cg);
 140 extern void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
 141                                             unsigned long start,
 142                                             unsigned long end);
 143
 144 extern void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
 145                                                 struct file_region *rg,
 146                                                 unsigned long nr_pages,
 147                                                 bool region_del);
 148
 149 extern void hugetlb_cgroup_file_init(void) __init;
 150 extern void hugetlb_cgroup_migrate(struct page *oldhpage,
 151                                    struct page *newhpage);
 152
 153 #else
 154 static inline void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
 155                                                        struct file_region *rg,
 156                                                        unsigned long nr_pages,
 157                                                        bool region_del)
 158 {
 159 }
 160
 161 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
 162 {
 163         return NULL;
 164 }
 165
 166 static inline struct hugetlb_cgroup *
 167 hugetlb_cgroup_from_page_resv(struct page *page)
 168 {
 169         return NULL;
 170 }
 171
 172 static inline struct hugetlb_cgroup *
 173 hugetlb_cgroup_from_page_rsvd(struct page *page)
 174 {
 175         return NULL;
 176 }
 177
 178 static inline int set_hugetlb_cgroup(struct page *page,
 179                                      struct hugetlb_cgroup *h_cg)
 180 {
 181         return 0;
 182 }
 183
 184 static inline int set_hugetlb_cgroup_rsvd(struct page *page,
 185                                           struct hugetlb_cgroup *h_cg)
 186 {
 187         return 0;
 188 }
 189
 190 static inline bool hugetlb_cgroup_disabled(void)
 191 {
 192         return true;
 193 }
 194
 195 static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
 196 {
 197 }
 198
 199 static inline int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
 200                                                struct hugetlb_cgroup **ptr)
 201 {
 202         return 0;
 203 }
 204
 205 static inline int hugetlb_cgroup_charge_cgroup_rsvd(int idx,
 206                                                     unsigned long nr_pages,
 207                                                     struct hugetlb_cgroup **ptr)
 208 {
 209         return 0;
 210 }
 211
 212 static inline void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
 213                                                 struct hugetlb_cgroup *h_cg,
 214                                                 struct page *page)
 215 {
 216 }
 217
 218 static inline void
 219 hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
 220                                   struct hugetlb_cgroup *h_cg,
 221                                   struct page *page)
 222 {
 223 }
 224
 225 static inline void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
 226                                                 struct page *page)
 227 {
 228 }
 229
 230 static inline void hugetlb_cgroup_uncharge_page_rsvd(int idx,
 231                                                      unsigned long nr_pages,
 232                                                      struct page *page)
 233 {
 234 }
 235 static inline void hugetlb_cgroup_uncharge_cgroup(int idx,
 236                                                   unsigned long nr_pages,
 237                                                   struct hugetlb_cgroup *h_cg)
 238 {
 239 }
 240
 241 static inline void
 242 hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
 243                                     struct hugetlb_cgroup *h_cg)
 244 {
 245 }
 246
 247 static inline void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
 248                                                    unsigned long start,
 249                                                    unsigned long end)
 250 {
 251 }
 252
 253 static inline void hugetlb_cgroup_file_init(void)
 254 {
 255 }
 256
 257 static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
 258                                           struct page *newhpage)
 259 {
 260 }
 261
 262 #endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
 263 #endif