2 * Copyright IBM Corporation, 2012
3 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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.
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.
15 #ifndef _LINUX_HUGETLB_CGROUP_H
16 #define _LINUX_HUGETLB_CGROUP_H
18 #include <linux/res_counter.h>
20 struct hugetlb_cgroup;
22 * Minimum page order trackable by hugetlb cgroup.
23 * At least 3 pages are necessary for all the tracking information.
25 #define HUGETLB_CGROUP_MIN_ORDER 2
27 #ifdef CONFIG_CGROUP_HUGETLB
29 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
31 VM_BUG_ON(!PageHuge(page));
33 if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
35 return (struct hugetlb_cgroup *)page[2].lru.next;
39 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
41 VM_BUG_ON(!PageHuge(page));
43 if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
45 page[2].lru.next = (void *)h_cg;
49 static inline bool hugetlb_cgroup_disabled(void)
51 if (hugetlb_subsys.disabled)
57 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
63 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
68 static inline bool hugetlb_cgroup_disabled(void)
73 #endif /* CONFIG_MEM_RES_CTLR_HUGETLB */