| /* |
| * Copyright IBM Corporation, 2012 |
| * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of version 2.1 of the GNU Lesser General Public License |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| */ |
| |
| #ifndef _LINUX_HUGETLB_CGROUP_H |
| #define _LINUX_HUGETLB_CGROUP_H |
| |
| #include <linux/mmdebug.h> |
| |
| struct hugetlb_cgroup; |
| /* |
| * Minimum page order trackable by hugetlb cgroup. |
| * At least 3 pages are necessary for all the tracking information. |
| */ |
| #define HUGETLB_CGROUP_MIN_ORDER 2 |
| |
| #ifdef CONFIG_CGROUP_HUGETLB |
| |
| static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page) |
| { |
| VM_BUG_ON_PAGE(!PageHuge(page), page); |
| |
| if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER) |
| return NULL; |
| return (struct hugetlb_cgroup *)page[2].lru.next; |
| } |
| |
| static inline |
| int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg) |
| { |
| VM_BUG_ON_PAGE(!PageHuge(page), page); |
| |
| if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER) |
| return -1; |
| page[2].lru.next = (void *)h_cg; |
| return 0; |
| } |
| |
| static inline bool hugetlb_cgroup_disabled(void) |
| { |
| return !cgroup_subsys_enabled(hugetlb_cgrp_subsys); |
| } |
| |
| extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, |
| struct hugetlb_cgroup **ptr); |
| extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, |
| struct hugetlb_cgroup *h_cg, |
| struct page *page); |
| extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, |
| struct page *page); |
| extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, |
| struct hugetlb_cgroup *h_cg); |
| extern void hugetlb_cgroup_file_init(void) __init; |
| extern void hugetlb_cgroup_migrate(struct page *oldhpage, |
| struct page *newhpage); |
| |
| #else |
| static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page) |
| { |
| return NULL; |
| } |
| |
| static inline |
| int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg) |
| { |
| return 0; |
| } |
| |
| static inline bool hugetlb_cgroup_disabled(void) |
| { |
| return true; |
| } |
| |
| static inline int |
| hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, |
| struct hugetlb_cgroup **ptr) |
| { |
| return 0; |
| } |
| |
| static inline void |
| hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, |
| struct hugetlb_cgroup *h_cg, |
| struct page *page) |
| { |
| return; |
| } |
| |
| static inline void |
| hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page) |
| { |
| return; |
| } |
| |
| static inline void |
| hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, |
| struct hugetlb_cgroup *h_cg) |
| { |
| return; |
| } |
| |
| static inline void hugetlb_cgroup_file_init(void) |
| { |
| } |
| |
| static inline void hugetlb_cgroup_migrate(struct page *oldhpage, |
| struct page *newhpage) |
| { |
| return; |
| } |
| |
| #endif /* CONFIG_MEM_RES_CTLR_HUGETLB */ |
| #endif |