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].lru.next; 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].lru.next = (void *)h_cg; 46 return 0; 47 } 48 49 static inline bool hugetlb_cgroup_disabled(void) 50 { 51 if (hugetlb_cgrp_subsys.disabled) 52 return true; 53 return false; 54 } 55 56 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, 57 struct hugetlb_cgroup **ptr); 58 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, 59 struct hugetlb_cgroup *h_cg, 60 struct page *page); 61 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, 62 struct page *page); 63 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, 64 struct hugetlb_cgroup *h_cg); 65 extern void hugetlb_cgroup_file_init(void) __init; 66 extern void hugetlb_cgroup_migrate(struct page *oldhpage, 67 struct page *newhpage); 68 69 #else 70 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page) 71 { 72 return NULL; 73 } 74 75 static inline 76 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg) 77 { 78 return 0; 79 } 80 81 static inline bool hugetlb_cgroup_disabled(void) 82 { 83 return true; 84 } 85 86 static inline int 87 hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, 88 struct hugetlb_cgroup **ptr) 89 { 90 return 0; 91 } 92 93 static inline void 94 hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, 95 struct hugetlb_cgroup *h_cg, 96 struct page *page) 97 { 98 return; 99 } 100 101 static inline void 102 hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page) 103 { 104 return; 105 } 106 107 static inline void 108 hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, 109 struct hugetlb_cgroup *h_cg) 110 { 111 return; 112 } 113 114 static inline void hugetlb_cgroup_file_init(void) 115 { 116 } 117 118 static inline void hugetlb_cgroup_migrate(struct page *oldhpage, 119 struct page *newhpage) 120 { 121 return; 122 } 123 124 #endif /* CONFIG_MEM_RES_CTLR_HUGETLB */ 125 #endif 126