tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include <linux/res_counter.h>
20
21struct hugetlb_cgroup;
22/*
23 * Minimum page order trackable by hugetlb cgroup.
24 * At least 3 pages are necessary for all the tracking information.
25 */
26#define HUGETLB_CGROUP_MIN_ORDER 2
27
28#ifdef CONFIG_CGROUP_HUGETLB
29
30static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
31{
32 VM_BUG_ON_PAGE(!PageHuge(page), page);
33
34 if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
35 return NULL;
36 return (struct hugetlb_cgroup *)page[2].lru.next;
37}
38
39static inline
40int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
41{
42 VM_BUG_ON_PAGE(!PageHuge(page), page);
43
44 if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
45 return -1;
46 page[2].lru.next = (void *)h_cg;
47 return 0;
48}
49
50static inline bool hugetlb_cgroup_disabled(void)
51{
52 if (hugetlb_cgrp_subsys.disabled)
53 return true;
54 return false;
55}
56
57extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
58 struct hugetlb_cgroup **ptr);
59extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
60 struct hugetlb_cgroup *h_cg,
61 struct page *page);
62extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
63 struct page *page);
64extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
65 struct hugetlb_cgroup *h_cg);
66extern void hugetlb_cgroup_file_init(void) __init;
67extern void hugetlb_cgroup_migrate(struct page *oldhpage,
68 struct page *newhpage);
69
70#else
71static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
72{
73 return NULL;
74}
75
76static inline
77int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
78{
79 return 0;
80}
81
82static inline bool hugetlb_cgroup_disabled(void)
83{
84 return true;
85}
86
87static inline int
88hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
89 struct hugetlb_cgroup **ptr)
90{
91 return 0;
92}
93
94static inline void
95hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
96 struct hugetlb_cgroup *h_cg,
97 struct page *page)
98{
99 return;
100}
101
102static inline void
103hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
104{
105 return;
106}
107
108static inline void
109hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
110 struct hugetlb_cgroup *h_cg)
111{
112 return;
113}
114
115static inline void hugetlb_cgroup_file_init(void)
116{
117}
118
119static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
120 struct page *newhpage)
121{
122 return;
123}
124
125#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
126#endif