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2bc64a20 AK |
1 | /* |
2 | * | |
3 | * Copyright IBM Corporation, 2012 | |
4 | * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | |
5 | * | |
faced7e0 GS |
6 | * Cgroup v2 |
7 | * Copyright (C) 2019 Red Hat, Inc. | |
8 | * Author: Giuseppe Scrivano <gscrivan@redhat.com> | |
9 | * | |
2bc64a20 AK |
10 | * This program is free software; you can redistribute it and/or modify it |
11 | * under the terms of version 2.1 of the GNU Lesser General Public License | |
12 | * as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it would be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
17 | * | |
18 | */ | |
19 | ||
20 | #include <linux/cgroup.h> | |
71f87bee | 21 | #include <linux/page_counter.h> |
2bc64a20 AK |
22 | #include <linux/slab.h> |
23 | #include <linux/hugetlb.h> | |
24 | #include <linux/hugetlb_cgroup.h> | |
25 | ||
faced7e0 GS |
26 | enum hugetlb_memory_event { |
27 | HUGETLB_MAX, | |
28 | HUGETLB_NR_MEMORY_EVENTS, | |
29 | }; | |
30 | ||
2bc64a20 AK |
31 | struct hugetlb_cgroup { |
32 | struct cgroup_subsys_state css; | |
faced7e0 | 33 | |
2bc64a20 AK |
34 | /* |
35 | * the counter to account for hugepages from hugetlb. | |
36 | */ | |
71f87bee | 37 | struct page_counter hugepage[HUGE_MAX_HSTATE]; |
faced7e0 GS |
38 | |
39 | atomic_long_t events[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS]; | |
40 | atomic_long_t events_local[HUGE_MAX_HSTATE][HUGETLB_NR_MEMORY_EVENTS]; | |
41 | ||
42 | /* Handle for "hugetlb.events" */ | |
43 | struct cgroup_file events_file[HUGE_MAX_HSTATE]; | |
44 | ||
45 | /* Handle for "hugetlb.events.local" */ | |
46 | struct cgroup_file events_local_file[HUGE_MAX_HSTATE]; | |
2bc64a20 AK |
47 | }; |
48 | ||
abb8206c AK |
49 | #define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
50 | #define MEMFILE_IDX(val) (((val) >> 16) & 0xffff) | |
51 | #define MEMFILE_ATTR(val) ((val) & 0xffff) | |
52 | ||
faced7e0 GS |
53 | #define hugetlb_cgroup_from_counter(counter, idx) \ |
54 | container_of(counter, struct hugetlb_cgroup, hugepage[idx]) | |
55 | ||
2bc64a20 AK |
56 | static struct hugetlb_cgroup *root_h_cgroup __read_mostly; |
57 | ||
58 | static inline | |
59 | struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s) | |
60 | { | |
a7c6d554 | 61 | return s ? container_of(s, struct hugetlb_cgroup, css) : NULL; |
2bc64a20 AK |
62 | } |
63 | ||
2bc64a20 AK |
64 | static inline |
65 | struct hugetlb_cgroup *hugetlb_cgroup_from_task(struct task_struct *task) | |
66 | { | |
073219e9 | 67 | return hugetlb_cgroup_from_css(task_css(task, hugetlb_cgrp_id)); |
2bc64a20 AK |
68 | } |
69 | ||
70 | static inline bool hugetlb_cgroup_is_root(struct hugetlb_cgroup *h_cg) | |
71 | { | |
72 | return (h_cg == root_h_cgroup); | |
73 | } | |
74 | ||
3f798518 TH |
75 | static inline struct hugetlb_cgroup * |
76 | parent_hugetlb_cgroup(struct hugetlb_cgroup *h_cg) | |
2bc64a20 | 77 | { |
5c9d535b | 78 | return hugetlb_cgroup_from_css(h_cg->css.parent); |
2bc64a20 AK |
79 | } |
80 | ||
3f798518 | 81 | static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg) |
2bc64a20 AK |
82 | { |
83 | int idx; | |
2bc64a20 AK |
84 | |
85 | for (idx = 0; idx < hugetlb_max_hstate; idx++) { | |
71f87bee | 86 | if (page_counter_read(&h_cg->hugepage[idx])) |
2bc64a20 AK |
87 | return true; |
88 | } | |
89 | return false; | |
90 | } | |
91 | ||
297880f4 DR |
92 | static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup, |
93 | struct hugetlb_cgroup *parent_h_cgroup) | |
94 | { | |
95 | int idx; | |
96 | ||
97 | for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) { | |
98 | struct page_counter *counter = &h_cgroup->hugepage[idx]; | |
99 | struct page_counter *parent = NULL; | |
100 | unsigned long limit; | |
101 | int ret; | |
102 | ||
103 | if (parent_h_cgroup) | |
104 | parent = &parent_h_cgroup->hugepage[idx]; | |
105 | page_counter_init(counter, parent); | |
106 | ||
107 | limit = round_down(PAGE_COUNTER_MAX, | |
108 | 1 << huge_page_order(&hstates[idx])); | |
bbec2e15 | 109 | ret = page_counter_set_max(counter, limit); |
297880f4 DR |
110 | VM_BUG_ON(ret); |
111 | } | |
112 | } | |
113 | ||
eb95419b TH |
114 | static struct cgroup_subsys_state * |
115 | hugetlb_cgroup_css_alloc(struct cgroup_subsys_state *parent_css) | |
2bc64a20 | 116 | { |
eb95419b TH |
117 | struct hugetlb_cgroup *parent_h_cgroup = hugetlb_cgroup_from_css(parent_css); |
118 | struct hugetlb_cgroup *h_cgroup; | |
2bc64a20 AK |
119 | |
120 | h_cgroup = kzalloc(sizeof(*h_cgroup), GFP_KERNEL); | |
121 | if (!h_cgroup) | |
122 | return ERR_PTR(-ENOMEM); | |
123 | ||
297880f4 | 124 | if (!parent_h_cgroup) |
2bc64a20 | 125 | root_h_cgroup = h_cgroup; |
297880f4 DR |
126 | |
127 | hugetlb_cgroup_init(h_cgroup, parent_h_cgroup); | |
2bc64a20 AK |
128 | return &h_cgroup->css; |
129 | } | |
130 | ||
eb95419b | 131 | static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css) |
2bc64a20 AK |
132 | { |
133 | struct hugetlb_cgroup *h_cgroup; | |
134 | ||
eb95419b | 135 | h_cgroup = hugetlb_cgroup_from_css(css); |
2bc64a20 AK |
136 | kfree(h_cgroup); |
137 | } | |
138 | ||
da1def55 AK |
139 | |
140 | /* | |
141 | * Should be called with hugetlb_lock held. | |
142 | * Since we are holding hugetlb_lock, pages cannot get moved from | |
143 | * active list or uncharged from the cgroup, So no need to get | |
144 | * page reference and test for page active here. This function | |
145 | * cannot fail. | |
146 | */ | |
3f798518 | 147 | static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg, |
da1def55 AK |
148 | struct page *page) |
149 | { | |
71f87bee JW |
150 | unsigned int nr_pages; |
151 | struct page_counter *counter; | |
da1def55 | 152 | struct hugetlb_cgroup *page_hcg; |
3f798518 | 153 | struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg); |
da1def55 AK |
154 | |
155 | page_hcg = hugetlb_cgroup_from_page(page); | |
156 | /* | |
157 | * We can have pages in active list without any cgroup | |
158 | * ie, hugepage with less than 3 pages. We can safely | |
159 | * ignore those pages. | |
160 | */ | |
161 | if (!page_hcg || page_hcg != h_cg) | |
162 | goto out; | |
163 | ||
d8c6546b | 164 | nr_pages = compound_nr(page); |
da1def55 AK |
165 | if (!parent) { |
166 | parent = root_h_cgroup; | |
167 | /* root has no limit */ | |
71f87bee | 168 | page_counter_charge(&parent->hugepage[idx], nr_pages); |
da1def55 AK |
169 | } |
170 | counter = &h_cg->hugepage[idx]; | |
71f87bee JW |
171 | /* Take the pages off the local counter */ |
172 | page_counter_cancel(counter, nr_pages); | |
da1def55 AK |
173 | |
174 | set_hugetlb_cgroup(page, parent); | |
175 | out: | |
176 | return; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Force the hugetlb cgroup to empty the hugetlb resources by moving them to | |
181 | * the parent cgroup. | |
182 | */ | |
eb95419b | 183 | static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css) |
2bc64a20 | 184 | { |
eb95419b | 185 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css); |
da1def55 AK |
186 | struct hstate *h; |
187 | struct page *page; | |
9d093cb1 | 188 | int idx = 0; |
da1def55 AK |
189 | |
190 | do { | |
da1def55 AK |
191 | for_each_hstate(h) { |
192 | spin_lock(&hugetlb_lock); | |
193 | list_for_each_entry(page, &h->hugepage_activelist, lru) | |
3f798518 | 194 | hugetlb_cgroup_move_parent(idx, h_cg, page); |
da1def55 AK |
195 | |
196 | spin_unlock(&hugetlb_lock); | |
197 | idx++; | |
198 | } | |
199 | cond_resched(); | |
3f798518 | 200 | } while (hugetlb_cgroup_have_usage(h_cg)); |
2bc64a20 AK |
201 | } |
202 | ||
faced7e0 GS |
203 | static inline void hugetlb_event(struct hugetlb_cgroup *hugetlb, int idx, |
204 | enum hugetlb_memory_event event) | |
205 | { | |
206 | atomic_long_inc(&hugetlb->events_local[idx][event]); | |
207 | cgroup_file_notify(&hugetlb->events_local_file[idx]); | |
208 | ||
209 | do { | |
210 | atomic_long_inc(&hugetlb->events[idx][event]); | |
211 | cgroup_file_notify(&hugetlb->events_file[idx]); | |
212 | } while ((hugetlb = parent_hugetlb_cgroup(hugetlb)) && | |
213 | !hugetlb_cgroup_is_root(hugetlb)); | |
214 | } | |
215 | ||
6d76dcf4 AK |
216 | int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, |
217 | struct hugetlb_cgroup **ptr) | |
218 | { | |
219 | int ret = 0; | |
71f87bee | 220 | struct page_counter *counter; |
6d76dcf4 | 221 | struct hugetlb_cgroup *h_cg = NULL; |
6d76dcf4 AK |
222 | |
223 | if (hugetlb_cgroup_disabled()) | |
224 | goto done; | |
225 | /* | |
226 | * We don't charge any cgroup if the compound page have less | |
227 | * than 3 pages. | |
228 | */ | |
229 | if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) | |
230 | goto done; | |
231 | again: | |
232 | rcu_read_lock(); | |
233 | h_cg = hugetlb_cgroup_from_task(current); | |
0362f326 | 234 | if (!css_tryget(&h_cg->css)) { |
6d76dcf4 AK |
235 | rcu_read_unlock(); |
236 | goto again; | |
237 | } | |
238 | rcu_read_unlock(); | |
239 | ||
faced7e0 GS |
240 | if (!page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, |
241 | &counter)) { | |
6071ca52 | 242 | ret = -ENOMEM; |
faced7e0 GS |
243 | hugetlb_event(hugetlb_cgroup_from_counter(counter, idx), idx, |
244 | HUGETLB_MAX); | |
245 | } | |
6d76dcf4 AK |
246 | css_put(&h_cg->css); |
247 | done: | |
248 | *ptr = h_cg; | |
249 | return ret; | |
250 | } | |
251 | ||
94ae8ba7 | 252 | /* Should be called with hugetlb_lock held */ |
6d76dcf4 AK |
253 | void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, |
254 | struct hugetlb_cgroup *h_cg, | |
255 | struct page *page) | |
256 | { | |
257 | if (hugetlb_cgroup_disabled() || !h_cg) | |
258 | return; | |
259 | ||
6d76dcf4 | 260 | set_hugetlb_cgroup(page, h_cg); |
6d76dcf4 AK |
261 | return; |
262 | } | |
263 | ||
264 | /* | |
265 | * Should be called with hugetlb_lock held | |
266 | */ | |
267 | void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, | |
268 | struct page *page) | |
269 | { | |
270 | struct hugetlb_cgroup *h_cg; | |
6d76dcf4 AK |
271 | |
272 | if (hugetlb_cgroup_disabled()) | |
273 | return; | |
7ea8574e | 274 | lockdep_assert_held(&hugetlb_lock); |
6d76dcf4 AK |
275 | h_cg = hugetlb_cgroup_from_page(page); |
276 | if (unlikely(!h_cg)) | |
277 | return; | |
278 | set_hugetlb_cgroup(page, NULL); | |
71f87bee | 279 | page_counter_uncharge(&h_cg->hugepage[idx], nr_pages); |
6d76dcf4 AK |
280 | return; |
281 | } | |
282 | ||
283 | void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, | |
284 | struct hugetlb_cgroup *h_cg) | |
285 | { | |
6d76dcf4 AK |
286 | if (hugetlb_cgroup_disabled() || !h_cg) |
287 | return; | |
288 | ||
289 | if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) | |
290 | return; | |
291 | ||
71f87bee | 292 | page_counter_uncharge(&h_cg->hugepage[idx], nr_pages); |
6d76dcf4 AK |
293 | return; |
294 | } | |
295 | ||
71f87bee JW |
296 | enum { |
297 | RES_USAGE, | |
298 | RES_LIMIT, | |
299 | RES_MAX_USAGE, | |
300 | RES_FAILCNT, | |
301 | }; | |
302 | ||
716f479d TH |
303 | static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css, |
304 | struct cftype *cft) | |
abb8206c | 305 | { |
71f87bee | 306 | struct page_counter *counter; |
182446d0 | 307 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css); |
abb8206c | 308 | |
71f87bee | 309 | counter = &h_cg->hugepage[MEMFILE_IDX(cft->private)]; |
abb8206c | 310 | |
71f87bee JW |
311 | switch (MEMFILE_ATTR(cft->private)) { |
312 | case RES_USAGE: | |
313 | return (u64)page_counter_read(counter) * PAGE_SIZE; | |
314 | case RES_LIMIT: | |
bbec2e15 | 315 | return (u64)counter->max * PAGE_SIZE; |
71f87bee JW |
316 | case RES_MAX_USAGE: |
317 | return (u64)counter->watermark * PAGE_SIZE; | |
318 | case RES_FAILCNT: | |
319 | return counter->failcnt; | |
320 | default: | |
321 | BUG(); | |
322 | } | |
abb8206c AK |
323 | } |
324 | ||
faced7e0 GS |
325 | static int hugetlb_cgroup_read_u64_max(struct seq_file *seq, void *v) |
326 | { | |
327 | int idx; | |
328 | u64 val; | |
329 | struct cftype *cft = seq_cft(seq); | |
330 | unsigned long limit; | |
331 | struct page_counter *counter; | |
332 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq)); | |
333 | ||
334 | idx = MEMFILE_IDX(cft->private); | |
335 | counter = &h_cg->hugepage[idx]; | |
336 | ||
337 | limit = round_down(PAGE_COUNTER_MAX, | |
338 | 1 << huge_page_order(&hstates[idx])); | |
339 | ||
340 | switch (MEMFILE_ATTR(cft->private)) { | |
341 | case RES_USAGE: | |
342 | val = (u64)page_counter_read(counter); | |
343 | seq_printf(seq, "%llu\n", val * PAGE_SIZE); | |
344 | break; | |
345 | case RES_LIMIT: | |
346 | val = (u64)counter->max; | |
347 | if (val == limit) | |
348 | seq_puts(seq, "max\n"); | |
349 | else | |
350 | seq_printf(seq, "%llu\n", val * PAGE_SIZE); | |
351 | break; | |
352 | default: | |
353 | BUG(); | |
354 | } | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
71f87bee JW |
359 | static DEFINE_MUTEX(hugetlb_limit_mutex); |
360 | ||
451af504 | 361 | static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of, |
faced7e0 GS |
362 | char *buf, size_t nbytes, loff_t off, |
363 | const char *max) | |
abb8206c | 364 | { |
71f87bee JW |
365 | int ret, idx; |
366 | unsigned long nr_pages; | |
451af504 | 367 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of)); |
abb8206c | 368 | |
71f87bee JW |
369 | if (hugetlb_cgroup_is_root(h_cg)) /* Can't set limit on root */ |
370 | return -EINVAL; | |
371 | ||
451af504 | 372 | buf = strstrip(buf); |
faced7e0 | 373 | ret = page_counter_memparse(buf, max, &nr_pages); |
71f87bee JW |
374 | if (ret) |
375 | return ret; | |
376 | ||
451af504 | 377 | idx = MEMFILE_IDX(of_cft(of)->private); |
297880f4 | 378 | nr_pages = round_down(nr_pages, 1 << huge_page_order(&hstates[idx])); |
abb8206c | 379 | |
71f87bee | 380 | switch (MEMFILE_ATTR(of_cft(of)->private)) { |
abb8206c | 381 | case RES_LIMIT: |
71f87bee | 382 | mutex_lock(&hugetlb_limit_mutex); |
bbec2e15 | 383 | ret = page_counter_set_max(&h_cg->hugepage[idx], nr_pages); |
71f87bee | 384 | mutex_unlock(&hugetlb_limit_mutex); |
abb8206c AK |
385 | break; |
386 | default: | |
387 | ret = -EINVAL; | |
388 | break; | |
389 | } | |
451af504 | 390 | return ret ?: nbytes; |
abb8206c AK |
391 | } |
392 | ||
faced7e0 GS |
393 | static ssize_t hugetlb_cgroup_write_legacy(struct kernfs_open_file *of, |
394 | char *buf, size_t nbytes, loff_t off) | |
395 | { | |
396 | return hugetlb_cgroup_write(of, buf, nbytes, off, "-1"); | |
397 | } | |
398 | ||
399 | static ssize_t hugetlb_cgroup_write_dfl(struct kernfs_open_file *of, | |
400 | char *buf, size_t nbytes, loff_t off) | |
401 | { | |
402 | return hugetlb_cgroup_write(of, buf, nbytes, off, "max"); | |
403 | } | |
404 | ||
6770c64e TH |
405 | static ssize_t hugetlb_cgroup_reset(struct kernfs_open_file *of, |
406 | char *buf, size_t nbytes, loff_t off) | |
abb8206c | 407 | { |
71f87bee JW |
408 | int ret = 0; |
409 | struct page_counter *counter; | |
6770c64e | 410 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of)); |
abb8206c | 411 | |
71f87bee | 412 | counter = &h_cg->hugepage[MEMFILE_IDX(of_cft(of)->private)]; |
abb8206c | 413 | |
71f87bee | 414 | switch (MEMFILE_ATTR(of_cft(of)->private)) { |
abb8206c | 415 | case RES_MAX_USAGE: |
71f87bee | 416 | page_counter_reset_watermark(counter); |
abb8206c AK |
417 | break; |
418 | case RES_FAILCNT: | |
71f87bee | 419 | counter->failcnt = 0; |
abb8206c AK |
420 | break; |
421 | default: | |
422 | ret = -EINVAL; | |
423 | break; | |
424 | } | |
6770c64e | 425 | return ret ?: nbytes; |
abb8206c AK |
426 | } |
427 | ||
428 | static char *mem_fmt(char *buf, int size, unsigned long hsize) | |
429 | { | |
430 | if (hsize >= (1UL << 30)) | |
431 | snprintf(buf, size, "%luGB", hsize >> 30); | |
432 | else if (hsize >= (1UL << 20)) | |
433 | snprintf(buf, size, "%luMB", hsize >> 20); | |
434 | else | |
435 | snprintf(buf, size, "%luKB", hsize >> 10); | |
436 | return buf; | |
437 | } | |
438 | ||
faced7e0 GS |
439 | static int __hugetlb_events_show(struct seq_file *seq, bool local) |
440 | { | |
441 | int idx; | |
442 | long max; | |
443 | struct cftype *cft = seq_cft(seq); | |
444 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq)); | |
445 | ||
446 | idx = MEMFILE_IDX(cft->private); | |
447 | ||
448 | if (local) | |
449 | max = atomic_long_read(&h_cg->events_local[idx][HUGETLB_MAX]); | |
450 | else | |
451 | max = atomic_long_read(&h_cg->events[idx][HUGETLB_MAX]); | |
452 | ||
453 | seq_printf(seq, "max %lu\n", max); | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
458 | static int hugetlb_events_show(struct seq_file *seq, void *v) | |
459 | { | |
460 | return __hugetlb_events_show(seq, false); | |
461 | } | |
462 | ||
463 | static int hugetlb_events_local_show(struct seq_file *seq, void *v) | |
464 | { | |
465 | return __hugetlb_events_show(seq, true); | |
466 | } | |
467 | ||
468 | static void __init __hugetlb_cgroup_file_dfl_init(int idx) | |
abb8206c AK |
469 | { |
470 | char buf[32]; | |
471 | struct cftype *cft; | |
472 | struct hstate *h = &hstates[idx]; | |
473 | ||
474 | /* format the size */ | |
475 | mem_fmt(buf, 32, huge_page_size(h)); | |
476 | ||
477 | /* Add the limit file */ | |
faced7e0 GS |
478 | cft = &h->cgroup_files_dfl[0]; |
479 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max", buf); | |
480 | cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT); | |
481 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
482 | cft->write = hugetlb_cgroup_write_dfl; | |
483 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
484 | ||
485 | /* Add the current usage file */ | |
486 | cft = &h->cgroup_files_dfl[1]; | |
487 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.current", buf); | |
488 | cft->private = MEMFILE_PRIVATE(idx, RES_USAGE); | |
489 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
490 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
491 | ||
492 | /* Add the events file */ | |
493 | cft = &h->cgroup_files_dfl[2]; | |
494 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events", buf); | |
495 | cft->private = MEMFILE_PRIVATE(idx, 0); | |
496 | cft->seq_show = hugetlb_events_show; | |
497 | cft->file_offset = offsetof(struct hugetlb_cgroup, events_file[idx]), | |
498 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
499 | ||
500 | /* Add the events.local file */ | |
501 | cft = &h->cgroup_files_dfl[3]; | |
502 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events.local", buf); | |
503 | cft->private = MEMFILE_PRIVATE(idx, 0); | |
504 | cft->seq_show = hugetlb_events_local_show; | |
505 | cft->file_offset = offsetof(struct hugetlb_cgroup, | |
506 | events_local_file[idx]), | |
507 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
508 | ||
509 | /* NULL terminate the last cft */ | |
510 | cft = &h->cgroup_files_dfl[4]; | |
511 | memset(cft, 0, sizeof(*cft)); | |
512 | ||
513 | WARN_ON(cgroup_add_dfl_cftypes(&hugetlb_cgrp_subsys, | |
514 | h->cgroup_files_dfl)); | |
515 | } | |
516 | ||
517 | static void __init __hugetlb_cgroup_file_legacy_init(int idx) | |
518 | { | |
519 | char buf[32]; | |
520 | struct cftype *cft; | |
521 | struct hstate *h = &hstates[idx]; | |
522 | ||
523 | /* format the size */ | |
524 | mem_fmt(buf, 32, huge_page_size(h)); | |
525 | ||
526 | /* Add the limit file */ | |
527 | cft = &h->cgroup_files_legacy[0]; | |
abb8206c AK |
528 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf); |
529 | cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT); | |
716f479d | 530 | cft->read_u64 = hugetlb_cgroup_read_u64; |
faced7e0 | 531 | cft->write = hugetlb_cgroup_write_legacy; |
abb8206c AK |
532 | |
533 | /* Add the usage file */ | |
faced7e0 | 534 | cft = &h->cgroup_files_legacy[1]; |
abb8206c AK |
535 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf); |
536 | cft->private = MEMFILE_PRIVATE(idx, RES_USAGE); | |
716f479d | 537 | cft->read_u64 = hugetlb_cgroup_read_u64; |
abb8206c AK |
538 | |
539 | /* Add the MAX usage file */ | |
faced7e0 | 540 | cft = &h->cgroup_files_legacy[2]; |
abb8206c AK |
541 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf); |
542 | cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE); | |
6770c64e | 543 | cft->write = hugetlb_cgroup_reset; |
716f479d | 544 | cft->read_u64 = hugetlb_cgroup_read_u64; |
abb8206c AK |
545 | |
546 | /* Add the failcntfile */ | |
faced7e0 | 547 | cft = &h->cgroup_files_legacy[3]; |
abb8206c AK |
548 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf); |
549 | cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT); | |
6770c64e | 550 | cft->write = hugetlb_cgroup_reset; |
716f479d | 551 | cft->read_u64 = hugetlb_cgroup_read_u64; |
abb8206c AK |
552 | |
553 | /* NULL terminate the last cft */ | |
faced7e0 | 554 | cft = &h->cgroup_files_legacy[4]; |
abb8206c AK |
555 | memset(cft, 0, sizeof(*cft)); |
556 | ||
2cf669a5 | 557 | WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys, |
faced7e0 GS |
558 | h->cgroup_files_legacy)); |
559 | } | |
560 | ||
561 | static void __init __hugetlb_cgroup_file_init(int idx) | |
562 | { | |
563 | __hugetlb_cgroup_file_dfl_init(idx); | |
564 | __hugetlb_cgroup_file_legacy_init(idx); | |
7179e7bf JW |
565 | } |
566 | ||
567 | void __init hugetlb_cgroup_file_init(void) | |
568 | { | |
569 | struct hstate *h; | |
570 | ||
571 | for_each_hstate(h) { | |
572 | /* | |
573 | * Add cgroup control files only if the huge page consists | |
574 | * of more than two normal pages. This is because we use | |
1d798ca3 | 575 | * page[2].private for storing cgroup details. |
7179e7bf JW |
576 | */ |
577 | if (huge_page_order(h) >= HUGETLB_CGROUP_MIN_ORDER) | |
578 | __hugetlb_cgroup_file_init(hstate_index(h)); | |
579 | } | |
abb8206c AK |
580 | } |
581 | ||
75754681 AK |
582 | /* |
583 | * hugetlb_lock will make sure a parallel cgroup rmdir won't happen | |
584 | * when we migrate hugepages | |
585 | */ | |
8e6ac7fa AK |
586 | void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage) |
587 | { | |
588 | struct hugetlb_cgroup *h_cg; | |
94ae8ba7 | 589 | struct hstate *h = page_hstate(oldhpage); |
8e6ac7fa AK |
590 | |
591 | if (hugetlb_cgroup_disabled()) | |
592 | return; | |
593 | ||
309381fe | 594 | VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage); |
8e6ac7fa AK |
595 | spin_lock(&hugetlb_lock); |
596 | h_cg = hugetlb_cgroup_from_page(oldhpage); | |
597 | set_hugetlb_cgroup(oldhpage, NULL); | |
8e6ac7fa AK |
598 | |
599 | /* move the h_cg details to new cgroup */ | |
600 | set_hugetlb_cgroup(newhpage, h_cg); | |
94ae8ba7 | 601 | list_move(&newhpage->lru, &h->hugepage_activelist); |
8e6ac7fa | 602 | spin_unlock(&hugetlb_lock); |
8e6ac7fa AK |
603 | return; |
604 | } | |
605 | ||
faced7e0 GS |
606 | static struct cftype hugetlb_files[] = { |
607 | {} /* terminate */ | |
608 | }; | |
609 | ||
073219e9 | 610 | struct cgroup_subsys hugetlb_cgrp_subsys = { |
92fb9748 TH |
611 | .css_alloc = hugetlb_cgroup_css_alloc, |
612 | .css_offline = hugetlb_cgroup_css_offline, | |
613 | .css_free = hugetlb_cgroup_css_free, | |
faced7e0 GS |
614 | .dfl_cftypes = hugetlb_files, |
615 | .legacy_cftypes = hugetlb_files, | |
2bc64a20 | 616 | }; |