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
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
hugetlb_cgroup_from_page(struct page * page)29 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
30 {
31 VM_BUG_ON_PAGE(!PageHuge(page), page);
32
33 if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
34 return NULL;
35 return (struct hugetlb_cgroup *)page[2].private;
36 }
37
38 static inline
set_hugetlb_cgroup(struct page * page,struct hugetlb_cgroup * h_cg)39 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
40 {
41 VM_BUG_ON_PAGE(!PageHuge(page), page);
42
43 if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
44 return -1;
45 page[2].private = (unsigned long)h_cg;
46 return 0;
47 }
48
hugetlb_cgroup_disabled(void)49 static inline bool hugetlb_cgroup_disabled(void)
50 {
51 return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
52 }
53
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);
63 extern void hugetlb_cgroup_file_init(void) __init;
64 extern void hugetlb_cgroup_migrate(struct page *oldhpage,
65 struct page *newhpage);
66
67 #else
hugetlb_cgroup_from_page(struct page * page)68 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
69 {
70 return NULL;
71 }
72
73 static inline
set_hugetlb_cgroup(struct page * page,struct hugetlb_cgroup * h_cg)74 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
75 {
76 return 0;
77 }
78
hugetlb_cgroup_disabled(void)79 static inline bool hugetlb_cgroup_disabled(void)
80 {
81 return true;
82 }
83
84 static inline int
hugetlb_cgroup_charge_cgroup(int idx,unsigned long nr_pages,struct hugetlb_cgroup ** ptr)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
hugetlb_cgroup_commit_charge(int idx,unsigned long nr_pages,struct hugetlb_cgroup * h_cg,struct page * page)92 hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
93 struct hugetlb_cgroup *h_cg,
94 struct page *page)
95 {
96 }
97
98 static inline void
hugetlb_cgroup_uncharge_page(int idx,unsigned long nr_pages,struct page * page)99 hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
100 {
101 }
102
103 static inline void
hugetlb_cgroup_uncharge_cgroup(int idx,unsigned long nr_pages,struct hugetlb_cgroup * h_cg)104 hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
105 struct hugetlb_cgroup *h_cg)
106 {
107 }
108
hugetlb_cgroup_file_init(void)109 static inline void hugetlb_cgroup_file_init(void)
110 {
111 }
112
hugetlb_cgroup_migrate(struct page * oldhpage,struct page * newhpage)113 static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
114 struct page *newhpage)
115 {
116 }
117
118 #endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
119 #endif
120