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Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -07001/*
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
Sasha Levin309381fea2014-01-23 15:52:54 -080018#include <linux/mmdebug.h>
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070019
20struct hugetlb_cgroup;
Aneesh Kumar K.V9dd540e2012-07-31 16:42:15 -070021/*
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
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070026
27#ifdef CONFIG_CGROUP_HUGETLB
Aneesh Kumar K.V9dd540e2012-07-31 16:42:15 -070028
29static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
30{
Sasha Levin309381fea2014-01-23 15:52:54 -080031 VM_BUG_ON_PAGE(!PageHuge(page), page);
Aneesh Kumar K.V9dd540e2012-07-31 16:42:15 -070032
33 if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
34 return NULL;
35 return (struct hugetlb_cgroup *)page[2].lru.next;
36}
37
38static inline
39int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
40{
Sasha Levin309381fea2014-01-23 15:52:54 -080041 VM_BUG_ON_PAGE(!PageHuge(page), page);
Aneesh Kumar K.V9dd540e2012-07-31 16:42:15 -070042
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
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070049static inline bool hugetlb_cgroup_disabled(void)
50{
Tejun Heo073219e2014-02-08 10:36:58 -050051 if (hugetlb_cgrp_subsys.disabled)
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070052 return true;
53 return false;
54}
55
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -070056extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
57 struct hugetlb_cgroup **ptr);
58extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
59 struct hugetlb_cgroup *h_cg,
60 struct page *page);
61extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
62 struct page *page);
63extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
64 struct hugetlb_cgroup *h_cg);
Jianguo Wu7179e7b2012-12-18 14:23:19 -080065extern void hugetlb_cgroup_file_init(void) __init;
Aneesh Kumar K.V8e6ac7f2012-07-31 16:42:27 -070066extern void hugetlb_cgroup_migrate(struct page *oldhpage,
67 struct page *newhpage);
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -070068
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070069#else
Aneesh Kumar K.V9dd540e2012-07-31 16:42:15 -070070static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
71{
72 return NULL;
73}
74
75static inline
76int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
77{
78 return 0;
79}
80
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070081static inline bool hugetlb_cgroup_disabled(void)
82{
83 return true;
84}
85
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -070086static inline int
87hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
88 struct hugetlb_cgroup **ptr)
89{
90 return 0;
91}
92
93static inline void
94hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
95 struct hugetlb_cgroup *h_cg,
96 struct page *page)
97{
98 return;
99}
100
101static inline void
102hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
103{
104 return;
105}
106
107static inline void
108hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
109 struct hugetlb_cgroup *h_cg)
110{
111 return;
112}
113
Jianguo Wu7179e7b2012-12-18 14:23:19 -0800114static inline void hugetlb_cgroup_file_init(void)
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700115{
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700116}
117
Aneesh Kumar K.V8e6ac7f2012-07-31 16:42:27 -0700118static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
119 struct page *newhpage)
120{
121 return;
122}
123
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -0700124#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
125#endif