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].lru.next;
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].lru.next = (void *)h_cg;
46 return 0;
47 }
48
hugetlb_cgroup_disabled(void)49 static inline bool hugetlb_cgroup_disabled(void)
50 {
51 if (hugetlb_cgrp_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
hugetlb_cgroup_from_page(struct page * page)70 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
71 {
72 return NULL;
73 }
74
75 static inline
set_hugetlb_cgroup(struct page * page,struct hugetlb_cgroup * h_cg)76 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
77 {
78 return 0;
79 }
80
hugetlb_cgroup_disabled(void)81 static inline bool hugetlb_cgroup_disabled(void)
82 {
83 return true;
84 }
85
86 static inline int
hugetlb_cgroup_charge_cgroup(int idx,unsigned long nr_pages,struct hugetlb_cgroup ** ptr)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
hugetlb_cgroup_commit_charge(int idx,unsigned long nr_pages,struct hugetlb_cgroup * h_cg,struct page * page)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
hugetlb_cgroup_uncharge_page(int idx,unsigned long nr_pages,struct page * page)102 hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
103 {
104 return;
105 }
106
107 static inline void
hugetlb_cgroup_uncharge_cgroup(int idx,unsigned long nr_pages,struct hugetlb_cgroup * h_cg)108 hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
109 struct hugetlb_cgroup *h_cg)
110 {
111 return;
112 }
113
hugetlb_cgroup_file_init(void)114 static inline void hugetlb_cgroup_file_init(void)
115 {
116 }
117
hugetlb_cgroup_migrate(struct page * oldhpage,struct page * newhpage)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