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2bc64a20 AK |
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 | ||
309381fe | 18 | #include <linux/mmdebug.h> |
2bc64a20 AK |
19 | |
20 | struct hugetlb_cgroup; | |
9dd540e2 AK |
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 | |
2bc64a20 AK |
26 | |
27 | #ifdef CONFIG_CGROUP_HUGETLB | |
9dd540e2 AK |
28 | |
29 | static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page) | |
30 | { | |
309381fe | 31 | VM_BUG_ON_PAGE(!PageHuge(page), page); |
9dd540e2 AK |
32 | |
33 | if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER) | |
34 | return NULL; | |
1d798ca3 | 35 | return (struct hugetlb_cgroup *)page[2].private; |
9dd540e2 AK |
36 | } |
37 | ||
38 | static inline | |
39 | int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg) | |
40 | { | |
309381fe | 41 | VM_BUG_ON_PAGE(!PageHuge(page), page); |
9dd540e2 AK |
42 | |
43 | if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER) | |
44 | return -1; | |
1d798ca3 | 45 | page[2].private = (unsigned long)h_cg; |
9dd540e2 AK |
46 | return 0; |
47 | } | |
48 | ||
2bc64a20 AK |
49 | static inline bool hugetlb_cgroup_disabled(void) |
50 | { | |
fc5ed1e9 | 51 | return !cgroup_subsys_enabled(hugetlb_cgrp_subsys); |
2bc64a20 AK |
52 | } |
53 | ||
6d76dcf4 AK |
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); | |
7179e7bf | 63 | extern void hugetlb_cgroup_file_init(void) __init; |
8e6ac7fa AK |
64 | extern void hugetlb_cgroup_migrate(struct page *oldhpage, |
65 | struct page *newhpage); | |
6d76dcf4 | 66 | |
2bc64a20 | 67 | #else |
9dd540e2 AK |
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 | ||
2bc64a20 AK |
79 | static inline bool hugetlb_cgroup_disabled(void) |
80 | { | |
81 | return true; | |
82 | } | |
83 | ||
6d76dcf4 AK |
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 | ||
7179e7bf | 112 | static inline void hugetlb_cgroup_file_init(void) |
abb8206c | 113 | { |
abb8206c AK |
114 | } |
115 | ||
8e6ac7fa AK |
116 | static inline void hugetlb_cgroup_migrate(struct page *oldhpage, |
117 | struct page *newhpage) | |
118 | { | |
119 | return; | |
120 | } | |
121 | ||
2bc64a20 AK |
122 | #endif /* CONFIG_MEM_RES_CTLR_HUGETLB */ |
123 | #endif |