| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 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 | |
| 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 |