blob: 33d59abe91f1a72a8e98ae5b25310ebdafb9bc17 [file] [log] [blame]
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -07001/*
2 *
3 * Copyright IBM Corporation, 2012
4 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2.1 of the GNU Lesser General Public License
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 *
14 */
15
16#include <linux/cgroup.h>
Johannes Weiner71f87bee2014-12-10 15:42:34 -080017#include <linux/page_counter.h>
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070018#include <linux/slab.h>
19#include <linux/hugetlb.h>
20#include <linux/hugetlb_cgroup.h>
21
22struct hugetlb_cgroup {
23 struct cgroup_subsys_state css;
24 /*
25 * the counter to account for hugepages from hugetlb.
26 */
Johannes Weiner71f87bee2014-12-10 15:42:34 -080027 struct page_counter hugepage[HUGE_MAX_HSTATE];
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070028};
29
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -070030#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
31#define MEMFILE_IDX(val) (((val) >> 16) & 0xffff)
32#define MEMFILE_ATTR(val) ((val) & 0xffff)
33
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070034static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
35
36static inline
37struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s)
38{
Tejun Heoa7c6d552013-08-08 20:11:23 -040039 return s ? container_of(s, struct hugetlb_cgroup, css) : NULL;
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070040}
41
42static inline
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070043struct hugetlb_cgroup *hugetlb_cgroup_from_task(struct task_struct *task)
44{
Tejun Heo073219e2014-02-08 10:36:58 -050045 return hugetlb_cgroup_from_css(task_css(task, hugetlb_cgrp_id));
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070046}
47
48static inline bool hugetlb_cgroup_is_root(struct hugetlb_cgroup *h_cg)
49{
50 return (h_cg == root_h_cgroup);
51}
52
Tejun Heo3f798512013-08-08 20:11:22 -040053static inline struct hugetlb_cgroup *
54parent_hugetlb_cgroup(struct hugetlb_cgroup *h_cg)
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070055{
Tejun Heo5c9d5352014-05-16 13:22:48 -040056 return hugetlb_cgroup_from_css(h_cg->css.parent);
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070057}
58
Tejun Heo3f798512013-08-08 20:11:22 -040059static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg)
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070060{
61 int idx;
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070062
63 for (idx = 0; idx < hugetlb_max_hstate; idx++) {
Johannes Weiner71f87bee2014-12-10 15:42:34 -080064 if (page_counter_read(&h_cg->hugepage[idx]))
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070065 return true;
66 }
67 return false;
68}
69
Tejun Heoeb954192013-08-08 20:11:23 -040070static struct cgroup_subsys_state *
71hugetlb_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070072{
Tejun Heoeb954192013-08-08 20:11:23 -040073 struct hugetlb_cgroup *parent_h_cgroup = hugetlb_cgroup_from_css(parent_css);
74 struct hugetlb_cgroup *h_cgroup;
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070075 int idx;
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070076
77 h_cgroup = kzalloc(sizeof(*h_cgroup), GFP_KERNEL);
78 if (!h_cgroup)
79 return ERR_PTR(-ENOMEM);
80
Tejun Heoeb954192013-08-08 20:11:23 -040081 if (parent_h_cgroup) {
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070082 for (idx = 0; idx < HUGE_MAX_HSTATE; idx++)
Johannes Weiner71f87bee2014-12-10 15:42:34 -080083 page_counter_init(&h_cgroup->hugepage[idx],
84 &parent_h_cgroup->hugepage[idx]);
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070085 } else {
86 root_h_cgroup = h_cgroup;
87 for (idx = 0; idx < HUGE_MAX_HSTATE; idx++)
Johannes Weiner71f87bee2014-12-10 15:42:34 -080088 page_counter_init(&h_cgroup->hugepage[idx], NULL);
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070089 }
90 return &h_cgroup->css;
91}
92
Tejun Heoeb954192013-08-08 20:11:23 -040093static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css)
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070094{
95 struct hugetlb_cgroup *h_cgroup;
96
Tejun Heoeb954192013-08-08 20:11:23 -040097 h_cgroup = hugetlb_cgroup_from_css(css);
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -070098 kfree(h_cgroup);
99}
100
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700101
102/*
103 * Should be called with hugetlb_lock held.
104 * Since we are holding hugetlb_lock, pages cannot get moved from
105 * active list or uncharged from the cgroup, So no need to get
106 * page reference and test for page active here. This function
107 * cannot fail.
108 */
Tejun Heo3f798512013-08-08 20:11:22 -0400109static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg,
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700110 struct page *page)
111{
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800112 unsigned int nr_pages;
113 struct page_counter *counter;
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700114 struct hugetlb_cgroup *page_hcg;
Tejun Heo3f798512013-08-08 20:11:22 -0400115 struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg);
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700116
117 page_hcg = hugetlb_cgroup_from_page(page);
118 /*
119 * We can have pages in active list without any cgroup
120 * ie, hugepage with less than 3 pages. We can safely
121 * ignore those pages.
122 */
123 if (!page_hcg || page_hcg != h_cg)
124 goto out;
125
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800126 nr_pages = 1 << compound_order(page);
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700127 if (!parent) {
128 parent = root_h_cgroup;
129 /* root has no limit */
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800130 page_counter_charge(&parent->hugepage[idx], nr_pages);
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700131 }
132 counter = &h_cg->hugepage[idx];
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800133 /* Take the pages off the local counter */
134 page_counter_cancel(counter, nr_pages);
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700135
136 set_hugetlb_cgroup(page, parent);
137out:
138 return;
139}
140
141/*
142 * Force the hugetlb cgroup to empty the hugetlb resources by moving them to
143 * the parent cgroup.
144 */
Tejun Heoeb954192013-08-08 20:11:23 -0400145static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css)
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -0700146{
Tejun Heoeb954192013-08-08 20:11:23 -0400147 struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700148 struct hstate *h;
149 struct page *page;
Michal Hocko9d093cb2012-10-26 13:37:33 +0200150 int idx = 0;
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700151
152 do {
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700153 for_each_hstate(h) {
154 spin_lock(&hugetlb_lock);
155 list_for_each_entry(page, &h->hugepage_activelist, lru)
Tejun Heo3f798512013-08-08 20:11:22 -0400156 hugetlb_cgroup_move_parent(idx, h_cg, page);
Aneesh Kumar K.Vda1def52012-07-31 16:42:21 -0700157
158 spin_unlock(&hugetlb_lock);
159 idx++;
160 }
161 cond_resched();
Tejun Heo3f798512013-08-08 20:11:22 -0400162 } while (hugetlb_cgroup_have_usage(h_cg));
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -0700163}
164
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700165int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
166 struct hugetlb_cgroup **ptr)
167{
168 int ret = 0;
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800169 struct page_counter *counter;
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700170 struct hugetlb_cgroup *h_cg = NULL;
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700171
172 if (hugetlb_cgroup_disabled())
173 goto done;
174 /*
175 * We don't charge any cgroup if the compound page have less
176 * than 3 pages.
177 */
178 if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
179 goto done;
180again:
181 rcu_read_lock();
182 h_cg = hugetlb_cgroup_from_task(current);
Tejun Heoec903c02014-05-13 12:11:01 -0400183 if (!css_tryget_online(&h_cg->css)) {
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700184 rcu_read_unlock();
185 goto again;
186 }
187 rcu_read_unlock();
188
Johannes Weiner6071ca52015-11-05 18:50:26 -0800189 if (!page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, &counter))
190 ret = -ENOMEM;
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700191 css_put(&h_cg->css);
192done:
193 *ptr = h_cg;
194 return ret;
195}
196
Aneesh Kumar K.V94ae8ba2012-07-31 16:42:35 -0700197/* Should be called with hugetlb_lock held */
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700198void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
199 struct hugetlb_cgroup *h_cg,
200 struct page *page)
201{
202 if (hugetlb_cgroup_disabled() || !h_cg)
203 return;
204
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700205 set_hugetlb_cgroup(page, h_cg);
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700206 return;
207}
208
209/*
210 * Should be called with hugetlb_lock held
211 */
212void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
213 struct page *page)
214{
215 struct hugetlb_cgroup *h_cg;
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700216
217 if (hugetlb_cgroup_disabled())
218 return;
Michal Hocko7ea85742014-08-29 15:18:42 -0700219 lockdep_assert_held(&hugetlb_lock);
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700220 h_cg = hugetlb_cgroup_from_page(page);
221 if (unlikely(!h_cg))
222 return;
223 set_hugetlb_cgroup(page, NULL);
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800224 page_counter_uncharge(&h_cg->hugepage[idx], nr_pages);
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700225 return;
226}
227
228void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
229 struct hugetlb_cgroup *h_cg)
230{
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700231 if (hugetlb_cgroup_disabled() || !h_cg)
232 return;
233
234 if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
235 return;
236
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800237 page_counter_uncharge(&h_cg->hugepage[idx], nr_pages);
Aneesh Kumar K.V6d76dcf2012-07-31 16:42:18 -0700238 return;
239}
240
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800241enum {
242 RES_USAGE,
243 RES_LIMIT,
244 RES_MAX_USAGE,
245 RES_FAILCNT,
246};
247
Tejun Heo716f4792013-12-05 12:28:03 -0500248static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
249 struct cftype *cft)
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700250{
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800251 struct page_counter *counter;
Tejun Heo182446d2013-08-08 20:11:24 -0400252 struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700253
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800254 counter = &h_cg->hugepage[MEMFILE_IDX(cft->private)];
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700255
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800256 switch (MEMFILE_ATTR(cft->private)) {
257 case RES_USAGE:
258 return (u64)page_counter_read(counter) * PAGE_SIZE;
259 case RES_LIMIT:
260 return (u64)counter->limit * PAGE_SIZE;
261 case RES_MAX_USAGE:
262 return (u64)counter->watermark * PAGE_SIZE;
263 case RES_FAILCNT:
264 return counter->failcnt;
265 default:
266 BUG();
267 }
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700268}
269
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800270static DEFINE_MUTEX(hugetlb_limit_mutex);
271
Tejun Heo451af502014-05-13 12:16:21 -0400272static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
273 char *buf, size_t nbytes, loff_t off)
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700274{
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800275 int ret, idx;
276 unsigned long nr_pages;
Tejun Heo451af502014-05-13 12:16:21 -0400277 struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700278
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800279 if (hugetlb_cgroup_is_root(h_cg)) /* Can't set limit on root */
280 return -EINVAL;
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700281
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800282 buf = strstrip(buf);
Johannes Weiner650c5e52015-02-11 15:26:03 -0800283 ret = page_counter_memparse(buf, "-1", &nr_pages);
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800284 if (ret)
285 return ret;
286
287 idx = MEMFILE_IDX(of_cft(of)->private);
288
289 switch (MEMFILE_ATTR(of_cft(of)->private)) {
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700290 case RES_LIMIT:
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800291 mutex_lock(&hugetlb_limit_mutex);
292 ret = page_counter_limit(&h_cg->hugepage[idx], nr_pages);
293 mutex_unlock(&hugetlb_limit_mutex);
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700294 break;
295 default:
296 ret = -EINVAL;
297 break;
298 }
Tejun Heo451af502014-05-13 12:16:21 -0400299 return ret ?: nbytes;
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700300}
301
Tejun Heo6770c642014-05-13 12:16:21 -0400302static ssize_t hugetlb_cgroup_reset(struct kernfs_open_file *of,
303 char *buf, size_t nbytes, loff_t off)
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700304{
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800305 int ret = 0;
306 struct page_counter *counter;
Tejun Heo6770c642014-05-13 12:16:21 -0400307 struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700308
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800309 counter = &h_cg->hugepage[MEMFILE_IDX(of_cft(of)->private)];
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700310
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800311 switch (MEMFILE_ATTR(of_cft(of)->private)) {
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700312 case RES_MAX_USAGE:
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800313 page_counter_reset_watermark(counter);
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700314 break;
315 case RES_FAILCNT:
Johannes Weiner71f87bee2014-12-10 15:42:34 -0800316 counter->failcnt = 0;
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700317 break;
318 default:
319 ret = -EINVAL;
320 break;
321 }
Tejun Heo6770c642014-05-13 12:16:21 -0400322 return ret ?: nbytes;
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700323}
324
325static char *mem_fmt(char *buf, int size, unsigned long hsize)
326{
327 if (hsize >= (1UL << 30))
328 snprintf(buf, size, "%luGB", hsize >> 30);
329 else if (hsize >= (1UL << 20))
330 snprintf(buf, size, "%luMB", hsize >> 20);
331 else
332 snprintf(buf, size, "%luKB", hsize >> 10);
333 return buf;
334}
335
Jianguo Wu7179e7b2012-12-18 14:23:19 -0800336static void __init __hugetlb_cgroup_file_init(int idx)
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700337{
338 char buf[32];
339 struct cftype *cft;
340 struct hstate *h = &hstates[idx];
341
342 /* format the size */
343 mem_fmt(buf, 32, huge_page_size(h));
344
345 /* Add the limit file */
346 cft = &h->cgroup_files[0];
347 snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf);
348 cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT);
Tejun Heo716f4792013-12-05 12:28:03 -0500349 cft->read_u64 = hugetlb_cgroup_read_u64;
Tejun Heo451af502014-05-13 12:16:21 -0400350 cft->write = hugetlb_cgroup_write;
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700351
352 /* Add the usage file */
353 cft = &h->cgroup_files[1];
354 snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf);
355 cft->private = MEMFILE_PRIVATE(idx, RES_USAGE);
Tejun Heo716f4792013-12-05 12:28:03 -0500356 cft->read_u64 = hugetlb_cgroup_read_u64;
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700357
358 /* Add the MAX usage file */
359 cft = &h->cgroup_files[2];
360 snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf);
361 cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE);
Tejun Heo6770c642014-05-13 12:16:21 -0400362 cft->write = hugetlb_cgroup_reset;
Tejun Heo716f4792013-12-05 12:28:03 -0500363 cft->read_u64 = hugetlb_cgroup_read_u64;
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700364
365 /* Add the failcntfile */
366 cft = &h->cgroup_files[3];
367 snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf);
368 cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT);
Tejun Heo6770c642014-05-13 12:16:21 -0400369 cft->write = hugetlb_cgroup_reset;
Tejun Heo716f4792013-12-05 12:28:03 -0500370 cft->read_u64 = hugetlb_cgroup_read_u64;
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700371
372 /* NULL terminate the last cft */
373 cft = &h->cgroup_files[4];
374 memset(cft, 0, sizeof(*cft));
375
Tejun Heo2cf669a2014-07-15 11:05:09 -0400376 WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys,
377 h->cgroup_files));
Jianguo Wu7179e7b2012-12-18 14:23:19 -0800378}
379
380void __init hugetlb_cgroup_file_init(void)
381{
382 struct hstate *h;
383
384 for_each_hstate(h) {
385 /*
386 * Add cgroup control files only if the huge page consists
387 * of more than two normal pages. This is because we use
388 * page[2].lru.next for storing cgroup details.
389 */
390 if (huge_page_order(h) >= HUGETLB_CGROUP_MIN_ORDER)
391 __hugetlb_cgroup_file_init(hstate_index(h));
392 }
Aneesh Kumar K.Vabb82062012-07-31 16:42:24 -0700393}
394
Aneesh Kumar K.V75754682012-07-31 16:42:36 -0700395/*
396 * hugetlb_lock will make sure a parallel cgroup rmdir won't happen
397 * when we migrate hugepages
398 */
Aneesh Kumar K.V8e6ac7f2012-07-31 16:42:27 -0700399void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
400{
401 struct hugetlb_cgroup *h_cg;
Aneesh Kumar K.V94ae8ba2012-07-31 16:42:35 -0700402 struct hstate *h = page_hstate(oldhpage);
Aneesh Kumar K.V8e6ac7f2012-07-31 16:42:27 -0700403
404 if (hugetlb_cgroup_disabled())
405 return;
406
Sasha Levin309381fea2014-01-23 15:52:54 -0800407 VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage);
Aneesh Kumar K.V8e6ac7f2012-07-31 16:42:27 -0700408 spin_lock(&hugetlb_lock);
409 h_cg = hugetlb_cgroup_from_page(oldhpage);
410 set_hugetlb_cgroup(oldhpage, NULL);
Aneesh Kumar K.V8e6ac7f2012-07-31 16:42:27 -0700411
412 /* move the h_cg details to new cgroup */
413 set_hugetlb_cgroup(newhpage, h_cg);
Aneesh Kumar K.V94ae8ba2012-07-31 16:42:35 -0700414 list_move(&newhpage->lru, &h->hugepage_activelist);
Aneesh Kumar K.V8e6ac7f2012-07-31 16:42:27 -0700415 spin_unlock(&hugetlb_lock);
Aneesh Kumar K.V8e6ac7f2012-07-31 16:42:27 -0700416 return;
417}
418
Tejun Heo073219e2014-02-08 10:36:58 -0500419struct cgroup_subsys hugetlb_cgrp_subsys = {
Tejun Heo92fb9742012-11-19 08:13:38 -0800420 .css_alloc = hugetlb_cgroup_css_alloc,
421 .css_offline = hugetlb_cgroup_css_offline,
422 .css_free = hugetlb_cgroup_css_free,
Aneesh Kumar K.V2bc64a22012-07-31 16:42:12 -0700423};