tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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;
21struct resv_map;
22struct file_region;
23
24#ifdef CONFIG_CGROUP_HUGETLB
25/*
26 * Minimum page order trackable by hugetlb cgroup.
27 * At least 4 pages are necessary for all the tracking information.
28 * The second tail page (hpage[SUBPAGE_INDEX_CGROUP]) is the fault
29 * usage cgroup. The third tail page (hpage[SUBPAGE_INDEX_CGROUP_RSVD])
30 * is the reservation usage cgroup.
31 */
32#define HUGETLB_CGROUP_MIN_ORDER order_base_2(__MAX_CGROUP_SUBPAGE_INDEX + 1)
33
34enum hugetlb_memory_event {
35 HUGETLB_MAX,
36 HUGETLB_NR_MEMORY_EVENTS,
37};
38
39struct hugetlb_cgroup {
40 struct cgroup_subsys_state css;
41
42 /*
43 * the counter to account for hugepages from hugetlb.
44 */
45 struct page_counter hugepage[HUGE_MAX_HSTATE];
46
47 /*
48 * the counter to account for hugepage reservations from hugetlb.
49 */
50 struct page_counter rsvd_hugepage[HUGE_MAX_HSTATE];
51
52 atomic_long_t events[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
53 atomic_long_t events_local[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS];
54
55 /* Handle for "hugetlb.events" */
56 struct cgroup_file events_file[HUGE_MAX_HSTATE];
57
58 /* Handle for "hugetlb.events.local" */
59 struct cgroup_file events_local_file[HUGE_MAX_HSTATE];
60};
61
62static inline struct hugetlb_cgroup *
63__hugetlb_cgroup_from_page(struct page *page, bool rsvd)
64{
65 VM_BUG_ON_PAGE(!PageHuge(page), page);
66
67 if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
68 return NULL;
69 if (rsvd)
70 return (void *)page_private(page + SUBPAGE_INDEX_CGROUP_RSVD);
71 else
72 return (void *)page_private(page + SUBPAGE_INDEX_CGROUP);
73}
74
75static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
76{
77 return __hugetlb_cgroup_from_page(page, false);
78}
79
80static inline struct hugetlb_cgroup *
81hugetlb_cgroup_from_page_rsvd(struct page *page)
82{
83 return __hugetlb_cgroup_from_page(page, true);
84}
85
86static inline int __set_hugetlb_cgroup(struct page *page,
87 struct hugetlb_cgroup *h_cg, bool rsvd)
88{
89 VM_BUG_ON_PAGE(!PageHuge(page), page);
90
91 if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
92 return -1;
93 if (rsvd)
94 set_page_private(page + SUBPAGE_INDEX_CGROUP_RSVD,
95 (unsigned long)h_cg);
96 else
97 set_page_private(page + SUBPAGE_INDEX_CGROUP,
98 (unsigned long)h_cg);
99 return 0;
100}
101
102static inline int set_hugetlb_cgroup(struct page *page,
103 struct hugetlb_cgroup *h_cg)
104{
105 return __set_hugetlb_cgroup(page, h_cg, false);
106}
107
108static inline int set_hugetlb_cgroup_rsvd(struct page *page,
109 struct hugetlb_cgroup *h_cg)
110{
111 return __set_hugetlb_cgroup(page, h_cg, true);
112}
113
114static inline bool hugetlb_cgroup_disabled(void)
115{
116 return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
117}
118
119static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
120{
121 css_put(&h_cg->css);
122}
123
124static inline void resv_map_dup_hugetlb_cgroup_uncharge_info(
125 struct resv_map *resv_map)
126{
127 if (resv_map->css)
128 css_get(resv_map->css);
129}
130
131static inline void resv_map_put_hugetlb_cgroup_uncharge_info(
132 struct resv_map *resv_map)
133{
134 if (resv_map->css)
135 css_put(resv_map->css);
136}
137
138extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
139 struct hugetlb_cgroup **ptr);
140extern int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages,
141 struct hugetlb_cgroup **ptr);
142extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
143 struct hugetlb_cgroup *h_cg,
144 struct page *page);
145extern void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
146 struct hugetlb_cgroup *h_cg,
147 struct page *page);
148extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
149 struct page *page);
150extern void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages,
151 struct page *page);
152
153extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
154 struct hugetlb_cgroup *h_cg);
155extern void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
156 struct hugetlb_cgroup *h_cg);
157extern void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
158 unsigned long start,
159 unsigned long end);
160
161extern void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
162 struct file_region *rg,
163 unsigned long nr_pages,
164 bool region_del);
165
166extern void hugetlb_cgroup_file_init(void) __init;
167extern void hugetlb_cgroup_migrate(struct page *oldhpage,
168 struct page *newhpage);
169
170#else
171static inline void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv,
172 struct file_region *rg,
173 unsigned long nr_pages,
174 bool region_del)
175{
176}
177
178static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
179{
180 return NULL;
181}
182
183static inline struct hugetlb_cgroup *
184hugetlb_cgroup_from_page_resv(struct page *page)
185{
186 return NULL;
187}
188
189static inline struct hugetlb_cgroup *
190hugetlb_cgroup_from_page_rsvd(struct page *page)
191{
192 return NULL;
193}
194
195static inline int set_hugetlb_cgroup(struct page *page,
196 struct hugetlb_cgroup *h_cg)
197{
198 return 0;
199}
200
201static inline int set_hugetlb_cgroup_rsvd(struct page *page,
202 struct hugetlb_cgroup *h_cg)
203{
204 return 0;
205}
206
207static inline bool hugetlb_cgroup_disabled(void)
208{
209 return true;
210}
211
212static inline void hugetlb_cgroup_put_rsvd_cgroup(struct hugetlb_cgroup *h_cg)
213{
214}
215
216static inline void resv_map_dup_hugetlb_cgroup_uncharge_info(
217 struct resv_map *resv_map)
218{
219}
220
221static inline void resv_map_put_hugetlb_cgroup_uncharge_info(
222 struct resv_map *resv_map)
223{
224}
225
226static inline int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
227 struct hugetlb_cgroup **ptr)
228{
229 return 0;
230}
231
232static inline int hugetlb_cgroup_charge_cgroup_rsvd(int idx,
233 unsigned long nr_pages,
234 struct hugetlb_cgroup **ptr)
235{
236 return 0;
237}
238
239static inline void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
240 struct hugetlb_cgroup *h_cg,
241 struct page *page)
242{
243}
244
245static inline void
246hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages,
247 struct hugetlb_cgroup *h_cg,
248 struct page *page)
249{
250}
251
252static inline void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
253 struct page *page)
254{
255}
256
257static inline void hugetlb_cgroup_uncharge_page_rsvd(int idx,
258 unsigned long nr_pages,
259 struct page *page)
260{
261}
262static inline void hugetlb_cgroup_uncharge_cgroup(int idx,
263 unsigned long nr_pages,
264 struct hugetlb_cgroup *h_cg)
265{
266}
267
268static inline void
269hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages,
270 struct hugetlb_cgroup *h_cg)
271{
272}
273
274static inline void hugetlb_cgroup_uncharge_counter(struct resv_map *resv,
275 unsigned long start,
276 unsigned long end)
277{
278}
279
280static inline void hugetlb_cgroup_file_init(void)
281{
282}
283
284static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
285 struct page *newhpage)
286{
287}
288
289#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
290#endif