include/linux/hugetlb_cgroup.h

   1 /*
   2  * Copyright IBM Corporation, 2012
   3  * Author Aneesh Kumar K.V <[email protected]>
   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 #ifdef CONFIG_CGROUP_HUGETLB
  25 /*
  26  * Minimum page order trackable by hugetlb cgroup.
  27  * At least 4 pages are necessary for all the tracking information.
  28  * The second tail page (hpage[SUBPAGE_INDEX_CGROUP]) is the fault
  29  * usage cgroup. The third tail page (hpage[SUBPAGE_INDEX_CGROUP_RSVD])
  30  * is the reservation usage cgroup.
  31  */
  32 #define HUGETLB_CGROUP_MIN_ORDER order_base_2(__MAX_CGROUP_SUBPAGE_INDEX + 1)
  33
  34 enum hugetlb_memory_event {
  35         HUGETLB_MAX,
  36         HUGETLB_NR_MEMORY_EVENTS,
  37 };
  38
  39 struct hugetlb_cgroup {
  40         struct cgroup_subsys_state css;
  41
  42         /*
  43          * the counter to account for hugepages from hugetlb.
  44          */
  45         struct page_counter hugepage[HUGE_MAX_HSTATE];
  46
  47         /*
  48          * the counter to account for hugepage reservations from hugetlb.
  49          */
  50         struct page_counter rsvd_hugepage[HUGE_MAX_HSTATE];
  51
  52         atomic_long_t events[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
  53         atomic_long_t events_local[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
  54
  55         /* Handle for "hugetlb.events" */
  56         struct cgroup_file events_file[HUGE_MAX_HSTATE];
  57
  58         /* Handle for "hugetlb.events.local" */
  59         struct cgroup_file events_local_file[HUGE_MAX_HSTATE];
  60 };
  61
  62 static inline struct hugetlb_cgroup *
  63 __hugetlb_cgroup_from_page(struct page *page, bool rsvd)
  64 {
  65         VM_BUG_ON_PAGE(!PageHuge(page), page);
  66
  67         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  68                 return NULL;
  69         if (rsvd)
  70                 return (void *)page_private(page + SUBPAGE_INDEX_CGROUP_RSVD);
  71         else
  72                 return (void *)page_private(page + SUBPAGE_INDEX_CGROUP);
  73 }
  74
  75 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
  76 {
  77         return __hugetlb_cgroup_from_page(page, false);
  78 }
  79
  80 static inline struct hugetlb_cgroup *
  81 hugetlb_cgroup_from_page_rsvd(struct page *page)
  82 {
  83         return __hugetlb_cgroup_from_page(page, true);
  84 }
  85
  86 static inline int __set_hugetlb_cgroup(struct page *page,
  87                                        struct hugetlb_cgroup *h_cg, bool rsvd)
  88 {
  89         VM_BUG_ON_PAGE(!PageHuge(page), page);
  90
  91         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  92                 return -1;
  93         if (rsvd)
  94                 set_page_private(page + SUBPAGE_INDEX_CGROUP_RSVD,
  95                                  (unsigned long)h_cg);
  96         else
  97                 set_page_private(page + SUBPAGE_INDEX_CGROUP,
  98                                  (unsigned long)h_cg);
  99         return 0;
 100 }
 101
 102 static inline int set_hugetlb_cgroup(struct page *page,
 103                                      struct hugetlb_cgroup *h_cg)
 104 {
 105         return __set_hugetlb_cgroup(page, h_cg, false);
 106 }
 107
 108 static inline int set_hugetlb_cgroup_rsvd(struct page *page,
 109                                           struct hugetlb_cgroup *h_cg)
 110 {
 111         return __set_hugetlb_cgroup(page, h_cg, true);
 112 }
 113
 114 static inline bool hugetlb_cgroup_disabled(void)
 115 {
 116         return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
 117 }
 118
 119 static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
 120 {
 121         css_put(&h_cg->css);
 122 }
 123
 124 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
 125                                         struct hugetlb_cgroup **ptr);
 126 extern int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
 127                                              struct hugetlb_cgroup **ptr);
 128 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
 129                                          struct hugetlb_cgroup *h_cg,
 130                                          struct page *page);
 131 extern void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
 132                                               struct hugetlb_cgroup *h_cg,
 133                                               struct page *page);
 134 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
 135                                          struct page *page);
 136 extern void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages,
 137                                               struct page *page);
 138
 139 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
 140                                            struct hugetlb_cgroup *h_cg);
 141 extern void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
 142                                                 struct hugetlb_cgroup *h_cg);
 143 extern void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
 144                                             unsigned long start,
 145                                             unsigned long end);
 146
 147 extern void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
 148                                                 struct file_region *rg,
 149                                                 unsigned long nr_pages,
 150                                                 bool region_del);
 151
 152 extern void hugetlb_cgroup_file_init(void) __init;
 153 extern void hugetlb_cgroup_migrate(struct page *oldhpage,
 154                                    struct page *newhpage);
 155
 156 #else
 157 static inline void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
 158                                                        struct file_region *rg,
 159                                                        unsigned long nr_pages,
 160                                                        bool region_del)
 161 {
 162 }
 163
 164 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
 165 {
 166         return NULL;
 167 }
 168
 169 static inline struct hugetlb_cgroup *
 170 hugetlb_cgroup_from_page_resv(struct page *page)
 171 {
 172         return NULL;
 173 }
 174
 175 static inline struct hugetlb_cgroup *
 176 hugetlb_cgroup_from_page_rsvd(struct page *page)
 177 {
 178         return NULL;
 179 }
 180
 181 static inline int set_hugetlb_cgroup(struct page *page,
 182                                      struct hugetlb_cgroup *h_cg)
 183 {
 184         return 0;
 185 }
 186
 187 static inline int set_hugetlb_cgroup_rsvd(struct page *page,
 188                                           struct hugetlb_cgroup *h_cg)
 189 {
 190         return 0;
 191 }
 192
 193 static inline bool hugetlb_cgroup_disabled(void)
 194 {
 195         return true;
 196 }
 197
 198 static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
 199 {
 200 }
 201
 202 static inline int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
 203                                                struct hugetlb_cgroup **ptr)
 204 {
 205         return 0;
 206 }
 207
 208 static inline int hugetlb_cgroup_charge_cgroup_rsvd(int idx,
 209                                                     unsigned long nr_pages,
 210                                                     struct hugetlb_cgroup **ptr)
 211 {
 212         return 0;
 213 }
 214
 215 static inline void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
 216                                                 struct hugetlb_cgroup *h_cg,
 217                                                 struct page *page)
 218 {
 219 }
 220
 221 static inline void
 222 hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
 223                                   struct hugetlb_cgroup *h_cg,
 224                                   struct page *page)
 225 {
 226 }
 227
 228 static inline void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
 229                                                 struct page *page)
 230 {
 231 }
 232
 233 static inline void hugetlb_cgroup_uncharge_page_rsvd(int idx,
 234                                                      unsigned long nr_pages,
 235                                                      struct page *page)
 236 {
 237 }
 238 static inline void hugetlb_cgroup_uncharge_cgroup(int idx,
 239                                                   unsigned long nr_pages,
 240                                                   struct hugetlb_cgroup *h_cg)
 241 {
 242 }
 243
 244 static inline void
 245 hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
 246                                     struct hugetlb_cgroup *h_cg)
 247 {
 248 }
 249
 250 static inline void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
 251                                                    unsigned long start,
 252                                                    unsigned long end)
 253 {
 254 }
 255
 256 static inline void hugetlb_cgroup_file_init(void)
 257 {
 258 }
 259
 260 static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
 261                                           struct page *newhpage)
 262 {
 263 }
 264
 265 #endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
 266 #endif