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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 void hugetlb_cgroup_file_init(void) __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 void hugetlb_cgroup_file_init(void) |
115 | { |
116 | } |
117 | |
118 | static inline void hugetlb_cgroup_migrate(struct page *oldhpage, |
119 | struct page *newhpage) |
120 | { |
121 | return; |
122 | } |
123 | |
124 | #endif /* CONFIG_MEM_RES_CTLR_HUGETLB */ |
125 | #endif |
126 |
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