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 #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_per_node {
  40         /* hugetlb usage in pages over all hstates. */
  41         unsigned long usage[HUGE_MAX_HSTATE];
  42 };
  43
  44 struct hugetlb_cgroup {
  45         struct cgroup_subsys_state css;
  46
  47         /*
  48          * the counter to account for hugepages from hugetlb.
  49          */
  50         struct page_counter hugepage[HUGE_MAX_HSTATE];
  51
  52         /*
  53          * the counter to account for hugepage reservations from hugetlb.
  54          */
  55         struct page_counter rsvd_hugepage[HUGE_MAX_HSTATE];
  56
  57         atomic_long_t events[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
  58         atomic_long_t events_local[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
  59
  60         /* Handle for "hugetlb.events" */
  61         struct cgroup_file events_file[HUGE_MAX_HSTATE];
  62
  63         /* Handle for "hugetlb.events.local" */
  64         struct cgroup_file events_local_file[HUGE_MAX_HSTATE];
  65
  66         struct hugetlb_cgroup_per_node *nodeinfo[];
  67 };
  68
  69 static inline struct hugetlb_cgroup *
  70 __hugetlb_cgroup_from_page(struct page *page, bool rsvd)
  71 {
  72         VM_BUG_ON_PAGE(!PageHuge(page), page);
  73
  74         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  75                 return NULL;
  76         if (rsvd)
  77                 return (void *)page_private(page + SUBPAGE_INDEX_CGROUP_RSVD);
  78         else
  79                 return (void *)page_private(page + SUBPAGE_INDEX_CGROUP);
  80 }
  81
  82 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
  83 {
  84         return __hugetlb_cgroup_from_page(page, false);
  85 }
  86
  87 static inline struct hugetlb_cgroup *
  88 hugetlb_cgroup_from_page_rsvd(struct page *page)
  89 {
  90         return __hugetlb_cgroup_from_page(page, true);
  91 }
  92
  93 static inline void __set_hugetlb_cgroup(struct page *page,
  94                                        struct hugetlb_cgroup *h_cg, bool rsvd)
  95 {
  96         VM_BUG_ON_PAGE(!PageHuge(page), page);
  97
  98         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  99                 return;
 100         if (rsvd)
 101                 set_page_private(page + SUBPAGE_INDEX_CGROUP_RSVD,
 102                                  (unsigned long)h_cg);
 103         else
 104                 set_page_private(page + SUBPAGE_INDEX_CGROUP,
 105                                  (unsigned long)h_cg);
 106 }
 107
 108 static inline void set_hugetlb_cgroup(struct page *page,
 109                                      struct hugetlb_cgroup *h_cg)
 110 {
 111         __set_hugetlb_cgroup(page, h_cg, false);
 112 }
 113
 114 static inline void set_hugetlb_cgroup_rsvd(struct page *page,
 115                                           struct hugetlb_cgroup *h_cg)
 116 {
 117         __set_hugetlb_cgroup(page, h_cg, true);
 118 }
 119
 120 static inline bool hugetlb_cgroup_disabled(void)
 121 {
 122         return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
 123 }
 124
 125 static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
 126 {
 127         css_put(&h_cg->css);
 128 }
 129
 130 static inline void resv_map_dup_hugetlb_cgroup_uncharge_info(
 131                                                 struct resv_map *resv_map)
 132 {
 133         if (resv_map->css)
 134                 css_get(resv_map->css);
 135 }
 136
 137 static inline void resv_map_put_hugetlb_cgroup_uncharge_info(
 138                                                 struct resv_map *resv_map)
 139 {
 140         if (resv_map->css)
 141                 css_put(resv_map->css);
 142 }
 143
 144 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
 145                                         struct hugetlb_cgroup **ptr);
 146 extern int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
 147                                              struct hugetlb_cgroup **ptr);
 148 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
 149                                          struct hugetlb_cgroup *h_cg,
 150                                          struct page *page);
 151 extern void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
 152                                               struct hugetlb_cgroup *h_cg,
 153                                               struct page *page);
 154 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
 155                                          struct page *page);
 156 extern void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages,
 157                                               struct page *page);
 158
 159 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
 160                                            struct hugetlb_cgroup *h_cg);
 161 extern void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
 162                                                 struct hugetlb_cgroup *h_cg);
 163 extern void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
 164                                             unsigned long start,
 165                                             unsigned long end);
 166
 167 extern void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
 168                                                 struct file_region *rg,
 169                                                 unsigned long nr_pages,
 170                                                 bool region_del);
 171
 172 extern void hugetlb_cgroup_file_init(void) __init;
 173 extern void hugetlb_cgroup_migrate(struct page *oldhpage,
 174                                    struct page *newhpage);
 175
 176 #else
 177 static inline void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
 178                                                        struct file_region *rg,
 179                                                        unsigned long nr_pages,
 180                                                        bool region_del)
 181 {
 182 }
 183
 184 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
 185 {
 186         return NULL;
 187 }
 188
 189 static inline struct hugetlb_cgroup *
 190 hugetlb_cgroup_from_page_resv(struct page *page)
 191 {
 192         return NULL;
 193 }
 194
 195 static inline struct hugetlb_cgroup *
 196 hugetlb_cgroup_from_page_rsvd(struct page *page)
 197 {
 198         return NULL;
 199 }
 200
 201 static inline void set_hugetlb_cgroup(struct page *page,
 202                                      struct hugetlb_cgroup *h_cg)
 203 {
 204 }
 205
 206 static inline void set_hugetlb_cgroup_rsvd(struct page *page,
 207                                           struct hugetlb_cgroup *h_cg)
 208 {
 209 }
 210
 211 static inline bool hugetlb_cgroup_disabled(void)
 212 {
 213         return true;
 214 }
 215
 216 static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
 217 {
 218 }
 219
 220 static inline void resv_map_dup_hugetlb_cgroup_uncharge_info(
 221                                                 struct resv_map *resv_map)
 222 {
 223 }
 224
 225 static inline void resv_map_put_hugetlb_cgroup_uncharge_info(
 226                                                 struct resv_map *resv_map)
 227 {
 228 }
 229
 230 static inline int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
 231                                                struct hugetlb_cgroup **ptr)
 232 {
 233         return 0;
 234 }
 235
 236 static inline int hugetlb_cgroup_charge_cgroup_rsvd(int idx,
 237                                                     unsigned long nr_pages,
 238                                                     struct hugetlb_cgroup **ptr)
 239 {
 240         return 0;
 241 }
 242
 243 static inline void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
 244                                                 struct hugetlb_cgroup *h_cg,
 245                                                 struct page *page)
 246 {
 247 }
 248
 249 static inline void
 250 hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
 251                                   struct hugetlb_cgroup *h_cg,
 252                                   struct page *page)
 253 {
 254 }
 255
 256 static inline void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
 257                                                 struct page *page)
 258 {
 259 }
 260
 261 static inline void hugetlb_cgroup_uncharge_page_rsvd(int idx,
 262                                                      unsigned long nr_pages,
 263                                                      struct page *page)
 264 {
 265 }
 266 static inline void hugetlb_cgroup_uncharge_cgroup(int idx,
 267                                                   unsigned long nr_pages,
 268                                                   struct hugetlb_cgroup *h_cg)
 269 {
 270 }
 271
 272 static inline void
 273 hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
 274                                     struct hugetlb_cgroup *h_cg)
 275 {
 276 }
 277
 278 static inline void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
 279                                                    unsigned long start,
 280                                                    unsigned long end)
 281 {
 282 }
 283
 284 static inline void hugetlb_cgroup_file_init(void)
 285 {
 286 }
 287
 288 static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
 289                                           struct page *newhpage)
 290 {
 291 }
 292
 293 #endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
 294 #endif