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/res_counter.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(!PageHuge(page));
  32
  33         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  34                 return NULL;
  35         return (struct hugetlb_cgroup *)page[2].lru.next;
  36 }
  37
  38 static inline
  39 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
  40 {
  41         VM_BUG_ON(!PageHuge(page));
  42
  43         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
  44                 return -1;
  45         page[2].lru.next = (void *)h_cg;
  46         return 0;
  47 }
  48
  49 static inline bool hugetlb_cgroup_disabled(void)
  50 {
  51         if (hugetlb_subsys.disabled)
  52                 return true;
  53         return false;
  54 }
  55
  56 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
  57                                         struct hugetlb_cgroup **ptr);
  58 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
  59                                          struct hugetlb_cgroup *h_cg,
  60                                          struct page *page);
  61 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
  62                                          struct page *page);
  63 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
  64                                            struct hugetlb_cgroup *h_cg);
  65
  66 #else
  67 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
  68 {
  69         return NULL;
  70 }
  71
  72 static inline
  73 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
  74 {
  75         return 0;
  76 }
  77
  78 static inline bool hugetlb_cgroup_disabled(void)
  79 {
  80         return true;
  81 }
  82
  83 static inline int
  84 hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
  85                              struct hugetlb_cgroup **ptr)
  86 {
  87         return 0;
  88 }
  89
  90 static inline void
  91 hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
  92                              struct hugetlb_cgroup *h_cg,
  93                              struct page *page)
  94 {
  95         return;
  96 }
  97
  98 static inline void
  99 hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
 100 {
 101         return;
 102 }
 103
 104 static inline void
 105 hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
 106                                struct hugetlb_cgroup *h_cg)
 107 {
 108         return;
 109 }
 110
 111 #endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
 112 #endif