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 20struct 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 29static 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].private; 36} 37 38static inline 39int 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].private = (unsigned long)h_cg; 46 return 0; 47} 48 49static inline bool hugetlb_cgroup_disabled(void) 50{ 51 return !cgroup_subsys_enabled(hugetlb_cgrp_subsys); 52} 53 54extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, 55 struct hugetlb_cgroup **ptr); 56extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, 57 struct hugetlb_cgroup *h_cg, 58 struct page *page); 59extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, 60 struct page *page); 61extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, 62 struct hugetlb_cgroup *h_cg); 63extern void hugetlb_cgroup_file_init(void) __init; 64extern void hugetlb_cgroup_migrate(struct page *oldhpage, 65 struct page *newhpage); 66 67#else 68static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page) 69{ 70 return NULL; 71} 72 73static inline 74int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg) 75{ 76 return 0; 77} 78 79static inline bool hugetlb_cgroup_disabled(void) 80{ 81 return true; 82} 83 84static inline int 85hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, 86 struct hugetlb_cgroup **ptr) 87{ 88 return 0; 89} 90 91static inline void 92hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, 93 struct hugetlb_cgroup *h_cg, 94 struct page *page) 95{ 96 return; 97} 98 99static inline void 100hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page) 101{ 102 return; 103} 104 105static inline void 106hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, 107 struct hugetlb_cgroup *h_cg) 108{ 109 return; 110} 111 112static inline void hugetlb_cgroup_file_init(void) 113{ 114} 115 116static inline void hugetlb_cgroup_migrate(struct page *oldhpage, 117 struct page *newhpage) 118{ 119 return; 120} 121 122#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */ 123#endif 124