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 /*
  22  * Minimum page order trackable by hugetlb cgroup.
  23  * At least 3 pages are necessary for all the tracking information.
  24  */
  25 #define HUGETLB_CGROUP_MIN_ORDER        2
  26
  27 #ifdef CONFIG_CGROUP_HUGETLB
  28
  29 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
  30 {
  31         VM_BUG_ON_PAGE(!PageHuge(page), page);
  32
  33         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  34                 return NULL;
  35         return (struct hugetlb_cgroup *)page[2].private;
  36 }
  37
  38 static inline
  39 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
  40 {
  41         VM_BUG_ON_PAGE(!PageHuge(page), page);
  42
  43         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  44                 return -1;
  45         page[2].private = (unsigned long)h_cg;
  46         return 0;
  47 }
  48
  49 static inline bool hugetlb_cgroup_disabled(void)
  50 {
  51         return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
  52 }
  53
  54 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
  55                                         struct hugetlb_cgroup **ptr);
  56 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
  57                                          struct hugetlb_cgroup *h_cg,
  58                                          struct page *page);
  59 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
  60                                          struct page *page);
  61 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
  62                                            struct hugetlb_cgroup *h_cg);
  63 extern void hugetlb_cgroup_file_init(void) __init;
  64 extern void hugetlb_cgroup_migrate(struct page *oldhpage,
  65                                    struct page *newhpage);
  66
  67 #else
  68 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
  69 {
  70         return NULL;
  71 }
  72
  73 static inline
  74 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
  75 {
  76         return 0;
  77 }
  78
  79 static inline bool hugetlb_cgroup_disabled(void)
  80 {
  81         return true;
  82 }
  83
  84 static inline int
  85 hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
  86                              struct hugetlb_cgroup **ptr)
  87 {
  88         return 0;
  89 }
  90
  91 static inline void
  92 hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
  93                              struct hugetlb_cgroup *h_cg,
  94                              struct page *page)
  95 {
  96         return;
  97 }
  98
  99 static inline void
 100 hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
 101 {
 102         return;
 103 }
 104
 105 static inline void
 106 hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
 107                                struct hugetlb_cgroup *h_cg)
 108 {
 109         return;
 110 }
 111
 112 static inline void hugetlb_cgroup_file_init(void)
 113 {
 114 }
 115
 116 static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
 117                                           struct page *newhpage)
 118 {
 119         return;
 120 }
 121
 122 #endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
 123 #endif