d73878c694b3d43e85fc8b2d62f29107ed61d157
[~shefty/rdma-dev.git] / 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 extern int hugetlb_cgroup_file_init(int idx) __init;
66 extern void hugetlb_cgroup_migrate(struct page *oldhpage,
67                                    struct page *newhpage);
68
69 #else
70 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
71 {
72         return NULL;
73 }
74
75 static inline
76 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
77 {
78         return 0;
79 }
80
81 static inline bool hugetlb_cgroup_disabled(void)
82 {
83         return true;
84 }
85
86 static inline int
87 hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
88                              struct hugetlb_cgroup **ptr)
89 {
90         return 0;
91 }
92
93 static inline void
94 hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
95                              struct hugetlb_cgroup *h_cg,
96                              struct page *page)
97 {
98         return;
99 }
100
101 static inline void
102 hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
103 {
104         return;
105 }
106
107 static inline void
108 hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
109                                struct hugetlb_cgroup *h_cg)
110 {
111         return;
112 }
113
114 static inline int __init hugetlb_cgroup_file_init(int idx)
115 {
116         return 0;
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