1 /* 2 * Copyright IBM Corporation, 2012 3 * Author Aneesh Kumar K.V <[email protected]> 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 20 struct 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 29 static 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 38 static inline 39 int 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 49 static inline bool hugetlb_cgroup_disabled(void) 50 { 51 return !cgroup_subsys_enabled(hugetlb_cgrp_subsys); 52 } 53 54 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, 55 struct hugetlb_cgroup **ptr); 56 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, 57 struct hugetlb_cgroup *h_cg, 58 struct page *page); 59 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, 60 struct page *page); 61 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, 62 struct hugetlb_cgroup *h_cg); 63 extern void hugetlb_cgroup_file_init(void) __init; 64 extern void hugetlb_cgroup_migrate(struct page *oldhpage, 65 struct page *newhpage); 66 67 #else 68 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page) 69 { 70 return NULL; 71 } 72 73 static inline 74 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg) 75 { 76 return 0; 77 } 78 79 static inline bool hugetlb_cgroup_disabled(void) 80 { 81 return true; 82 } 83 84 static inline int 85 hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, 86 struct hugetlb_cgroup **ptr) 87 { 88 return 0; 89 } 90 91 static inline void 92 hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, 93 struct hugetlb_cgroup *h_cg, 94 struct page *page) 95 { 96 return; 97 } 98 99 static inline void 100 hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page) 101 { 102 return; 103 } 104 105 static inline void 106 hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, 107 struct hugetlb_cgroup *h_cg) 108 { 109 return; 110 } 111 112 static inline void hugetlb_cgroup_file_init(void) 113 { 114 } 115 116 static 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