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 #include <linux/res_counter.h>
  20
  21 struct hugetlb_cgroup;
  22 /*
  23  * Minimum page order trackable by hugetlb cgroup.
  24  * At least 3 pages are necessary for all the tracking information.
  25  */
  26 #define HUGETLB_CGROUP_MIN_ORDER        2
  27
  28 #ifdef CONFIG_CGROUP_HUGETLB
  29
  30 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
  31 {
  32         VM_BUG_ON_PAGE(!PageHuge(page), page);
  33
  34         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  35                 return NULL;
  36         return (struct hugetlb_cgroup *)page[2].lru.next;
  37 }
  38
  39 static inline
  40 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
  41 {
  42         VM_BUG_ON_PAGE(!PageHuge(page), page);
  43
  44         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  45                 return -1;
  46         page[2].lru.next = (void *)h_cg;
  47         return 0;
  48 }
  49
  50 static inline bool hugetlb_cgroup_disabled(void)
  51 {
  52         if (hugetlb_cgrp_subsys.disabled)
  53                 return true;
  54         return false;
  55 }
  56
  57 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
  58                                         struct hugetlb_cgroup **ptr);
  59 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
  60                                          struct hugetlb_cgroup *h_cg,
  61                                          struct page *page);
  62 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
  63                                          struct page *page);
  64 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
  65                                            struct hugetlb_cgroup *h_cg);
  66 extern void hugetlb_cgroup_file_init(void) __init;
  67 extern void hugetlb_cgroup_migrate(struct page *oldhpage,
  68                                    struct page *newhpage);
  69
  70 #else
  71 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
  72 {
  73         return NULL;
  74 }
  75
  76 static inline
  77 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
  78 {
  79         return 0;
  80 }
  81
  82 static inline bool hugetlb_cgroup_disabled(void)
  83 {
  84         return true;
  85 }
  86
  87 static inline int
  88 hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
  89                              struct hugetlb_cgroup **ptr)
  90 {
  91         return 0;
  92 }
  93
  94 static inline void
  95 hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
  96                              struct hugetlb_cgroup *h_cg,
  97                              struct page *page)
  98 {
  99         return;
 100 }
 101
 102 static inline void
 103 hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
 104 {
 105         return;
 106 }
 107
 108 static inline void
 109 hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
 110                                struct hugetlb_cgroup *h_cg)
 111 {
 112         return;
 113 }
 114
 115 static inline void hugetlb_cgroup_file_init(void)
 116 {
 117 }
 118
 119 static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
 120                                           struct page *newhpage)
 121 {
 122         return;
 123 }
 124
 125 #endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
 126 #endif