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 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
 117                                         struct hugetlb_cgroup **ptr);
 118 extern int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
 119                                              struct hugetlb_cgroup **ptr);
 120 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
 121                                          struct hugetlb_cgroup *h_cg,
 122                                          struct page *page);
 123 extern void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
 124                                               struct hugetlb_cgroup *h_cg,
 125                                               struct page *page);
 126 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
 127                                          struct page *page);
 128 extern void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages,
 129                                               struct page *page);
 130
 131 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
 132                                            struct hugetlb_cgroup *h_cg);
 133 extern void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
 134                                                 struct hugetlb_cgroup *h_cg);
 135 extern void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
 136                                             unsigned long start,
 137                                             unsigned long end);
 138
 139 extern void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
 140                                                 struct file_region *rg,
 141                                                 unsigned long nr_pages);
 142
 143 extern void hugetlb_cgroup_file_init(void) __init;
 144 extern void hugetlb_cgroup_migrate(struct page *oldhpage,
 145                                    struct page *newhpage);
 146
 147 #else
 148 static inline void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
 149                                                        struct file_region *rg,
 150                                                        unsigned long nr_pages)
 151 {
 152 }
 153
 154 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
 155 {
 156         return NULL;
 157 }
 158
 159 static inline struct hugetlb_cgroup *
 160 hugetlb_cgroup_from_page_resv(struct page *page)
 161 {
 162         return NULL;
 163 }
 164
 165 static inline struct hugetlb_cgroup *
 166 hugetlb_cgroup_from_page_rsvd(struct page *page)
 167 {
 168         return NULL;
 169 }
 170
 171 static inline int set_hugetlb_cgroup(struct page *page,
 172                                      struct hugetlb_cgroup *h_cg)
 173 {
 174         return 0;
 175 }
 176
 177 static inline int set_hugetlb_cgroup_rsvd(struct page *page,
 178                                           struct hugetlb_cgroup *h_cg)
 179 {
 180         return 0;
 181 }
 182
 183 static inline bool hugetlb_cgroup_disabled(void)
 184 {
 185         return true;
 186 }
 187
 188 static inline int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
 189                                                struct hugetlb_cgroup **ptr)
 190 {
 191         return 0;
 192 }
 193
 194 static inline int hugetlb_cgroup_charge_cgroup_rsvd(int idx,
 195                                                     unsigned long nr_pages,
 196                                                     struct hugetlb_cgroup **ptr)
 197 {
 198         return 0;
 199 }
 200
 201 static inline void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
 202                                                 struct hugetlb_cgroup *h_cg,
 203                                                 struct page *page)
 204 {
 205 }
 206
 207 static inline void
 208 hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
 209                                   struct hugetlb_cgroup *h_cg,
 210                                   struct page *page)
 211 {
 212 }
 213
 214 static inline void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
 215                                                 struct page *page)
 216 {
 217 }
 218
 219 static inline void hugetlb_cgroup_uncharge_page_rsvd(int idx,
 220                                                      unsigned long nr_pages,
 221                                                      struct page *page)
 222 {
 223 }
 224 static inline void hugetlb_cgroup_uncharge_cgroup(int idx,
 225                                                   unsigned long nr_pages,
 226                                                   struct hugetlb_cgroup *h_cg)
 227 {
 228 }
 229
 230 static inline void
 231 hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
 232                                     struct hugetlb_cgroup *h_cg)
 233 {
 234 }
 235
 236 static inline void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
 237                                                    unsigned long start,
 238                                                    unsigned long end)
 239 {
 240 }
 241
 242 static inline void hugetlb_cgroup_file_init(void)
 243 {
 244 }
 245
 246 static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
 247                                           struct page *newhpage)
 248 {
 249 }
 250
 251 #endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
 252 #endif