Commit | Line | Data |
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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 | ||
abb8206c AK |
26 | #define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
27 | #define MEMFILE_IDX(val) (((val) >> 16) & 0xffff) | |
28 | #define MEMFILE_ATTR(val) ((val) & 0xffff) | |
29 | ||
faced7e0 GS |
30 | #define hugetlb_cgroup_from_counter(counter, idx) \ |
31 | container_of(counter, struct hugetlb_cgroup, hugepage[idx]) | |
32 | ||
2bc64a20 AK |
33 | static struct hugetlb_cgroup *root_h_cgroup __read_mostly; |
34 | ||
cdc2fcfe | 35 | static inline struct page_counter * |
1adc4d41 MA |
36 | __hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx, |
37 | bool rsvd) | |
cdc2fcfe MA |
38 | { |
39 | if (rsvd) | |
40 | return &h_cg->rsvd_hugepage[idx]; | |
41 | return &h_cg->hugepage[idx]; | |
42 | } | |
43 | ||
1adc4d41 MA |
44 | static inline struct page_counter * |
45 | hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx) | |
46 | { | |
47 | return __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, false); | |
48 | } | |
49 | ||
50 | static inline struct page_counter * | |
51 | hugetlb_cgroup_counter_from_cgroup_rsvd(struct hugetlb_cgroup *h_cg, int idx) | |
52 | { | |
53 | return __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, true); | |
54 | } | |
55 | ||
2bc64a20 AK |
56 | static inline |
57 | struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s) | |
58 | { | |
a7c6d554 | 59 | return s ? container_of(s, struct hugetlb_cgroup, css) : NULL; |
2bc64a20 AK |
60 | } |
61 | ||
2bc64a20 AK |
62 | static inline |
63 | struct hugetlb_cgroup *hugetlb_cgroup_from_task(struct task_struct *task) | |
64 | { | |
073219e9 | 65 | return hugetlb_cgroup_from_css(task_css(task, hugetlb_cgrp_id)); |
2bc64a20 AK |
66 | } |
67 | ||
68 | static inline bool hugetlb_cgroup_is_root(struct hugetlb_cgroup *h_cg) | |
69 | { | |
70 | return (h_cg == root_h_cgroup); | |
71 | } | |
72 | ||
3f798518 TH |
73 | static inline struct hugetlb_cgroup * |
74 | parent_hugetlb_cgroup(struct hugetlb_cgroup *h_cg) | |
2bc64a20 | 75 | { |
5c9d535b | 76 | return hugetlb_cgroup_from_css(h_cg->css.parent); |
2bc64a20 AK |
77 | } |
78 | ||
3f798518 | 79 | static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg) |
2bc64a20 AK |
80 | { |
81 | int idx; | |
2bc64a20 AK |
82 | |
83 | for (idx = 0; idx < hugetlb_max_hstate; idx++) { | |
1adc4d41 | 84 | if (page_counter_read( |
7a5bde37 | 85 | hugetlb_cgroup_counter_from_cgroup(h_cg, idx))) |
2bc64a20 AK |
86 | return true; |
87 | } | |
88 | return false; | |
89 | } | |
90 | ||
297880f4 DR |
91 | static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup, |
92 | struct hugetlb_cgroup *parent_h_cgroup) | |
93 | { | |
94 | int idx; | |
95 | ||
96 | for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) { | |
1adc4d41 MA |
97 | struct page_counter *fault_parent = NULL; |
98 | struct page_counter *rsvd_parent = NULL; | |
297880f4 DR |
99 | unsigned long limit; |
100 | int ret; | |
101 | ||
1adc4d41 MA |
102 | if (parent_h_cgroup) { |
103 | fault_parent = hugetlb_cgroup_counter_from_cgroup( | |
104 | parent_h_cgroup, idx); | |
105 | rsvd_parent = hugetlb_cgroup_counter_from_cgroup_rsvd( | |
106 | parent_h_cgroup, idx); | |
107 | } | |
108 | page_counter_init(hugetlb_cgroup_counter_from_cgroup(h_cgroup, | |
109 | idx), | |
110 | fault_parent); | |
111 | page_counter_init( | |
112 | hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx), | |
113 | rsvd_parent); | |
297880f4 DR |
114 | |
115 | limit = round_down(PAGE_COUNTER_MAX, | |
8938494c | 116 | pages_per_huge_page(&hstates[idx])); |
1adc4d41 MA |
117 | |
118 | ret = page_counter_set_max( | |
119 | hugetlb_cgroup_counter_from_cgroup(h_cgroup, idx), | |
120 | limit); | |
121 | VM_BUG_ON(ret); | |
122 | ret = page_counter_set_max( | |
123 | hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx), | |
124 | limit); | |
297880f4 DR |
125 | VM_BUG_ON(ret); |
126 | } | |
127 | } | |
128 | ||
eb95419b TH |
129 | static struct cgroup_subsys_state * |
130 | hugetlb_cgroup_css_alloc(struct cgroup_subsys_state *parent_css) | |
2bc64a20 | 131 | { |
eb95419b TH |
132 | struct hugetlb_cgroup *parent_h_cgroup = hugetlb_cgroup_from_css(parent_css); |
133 | struct hugetlb_cgroup *h_cgroup; | |
2bc64a20 AK |
134 | |
135 | h_cgroup = kzalloc(sizeof(*h_cgroup), GFP_KERNEL); | |
136 | if (!h_cgroup) | |
137 | return ERR_PTR(-ENOMEM); | |
138 | ||
297880f4 | 139 | if (!parent_h_cgroup) |
2bc64a20 | 140 | root_h_cgroup = h_cgroup; |
297880f4 DR |
141 | |
142 | hugetlb_cgroup_init(h_cgroup, parent_h_cgroup); | |
2bc64a20 AK |
143 | return &h_cgroup->css; |
144 | } | |
145 | ||
eb95419b | 146 | static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css) |
2bc64a20 AK |
147 | { |
148 | struct hugetlb_cgroup *h_cgroup; | |
149 | ||
eb95419b | 150 | h_cgroup = hugetlb_cgroup_from_css(css); |
2bc64a20 AK |
151 | kfree(h_cgroup); |
152 | } | |
153 | ||
da1def55 AK |
154 | /* |
155 | * Should be called with hugetlb_lock held. | |
156 | * Since we are holding hugetlb_lock, pages cannot get moved from | |
157 | * active list or uncharged from the cgroup, So no need to get | |
158 | * page reference and test for page active here. This function | |
159 | * cannot fail. | |
160 | */ | |
3f798518 | 161 | static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg, |
da1def55 AK |
162 | struct page *page) |
163 | { | |
71f87bee JW |
164 | unsigned int nr_pages; |
165 | struct page_counter *counter; | |
da1def55 | 166 | struct hugetlb_cgroup *page_hcg; |
3f798518 | 167 | struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg); |
da1def55 AK |
168 | |
169 | page_hcg = hugetlb_cgroup_from_page(page); | |
170 | /* | |
171 | * We can have pages in active list without any cgroup | |
172 | * ie, hugepage with less than 3 pages. We can safely | |
173 | * ignore those pages. | |
174 | */ | |
175 | if (!page_hcg || page_hcg != h_cg) | |
176 | goto out; | |
177 | ||
d8c6546b | 178 | nr_pages = compound_nr(page); |
da1def55 AK |
179 | if (!parent) { |
180 | parent = root_h_cgroup; | |
181 | /* root has no limit */ | |
71f87bee | 182 | page_counter_charge(&parent->hugepage[idx], nr_pages); |
da1def55 AK |
183 | } |
184 | counter = &h_cg->hugepage[idx]; | |
71f87bee JW |
185 | /* Take the pages off the local counter */ |
186 | page_counter_cancel(counter, nr_pages); | |
da1def55 AK |
187 | |
188 | set_hugetlb_cgroup(page, parent); | |
189 | out: | |
190 | return; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Force the hugetlb cgroup to empty the hugetlb resources by moving them to | |
195 | * the parent cgroup. | |
196 | */ | |
eb95419b | 197 | static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css) |
2bc64a20 | 198 | { |
eb95419b | 199 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css); |
da1def55 AK |
200 | struct hstate *h; |
201 | struct page *page; | |
7a5bde37 | 202 | int idx; |
da1def55 AK |
203 | |
204 | do { | |
7a5bde37 | 205 | idx = 0; |
da1def55 AK |
206 | for_each_hstate(h) { |
207 | spin_lock(&hugetlb_lock); | |
208 | list_for_each_entry(page, &h->hugepage_activelist, lru) | |
3f798518 | 209 | hugetlb_cgroup_move_parent(idx, h_cg, page); |
da1def55 AK |
210 | |
211 | spin_unlock(&hugetlb_lock); | |
212 | idx++; | |
213 | } | |
214 | cond_resched(); | |
3f798518 | 215 | } while (hugetlb_cgroup_have_usage(h_cg)); |
2bc64a20 AK |
216 | } |
217 | ||
faced7e0 GS |
218 | static inline void hugetlb_event(struct hugetlb_cgroup *hugetlb, int idx, |
219 | enum hugetlb_memory_event event) | |
220 | { | |
221 | atomic_long_inc(&hugetlb->events_local[idx][event]); | |
222 | cgroup_file_notify(&hugetlb->events_local_file[idx]); | |
223 | ||
224 | do { | |
225 | atomic_long_inc(&hugetlb->events[idx][event]); | |
226 | cgroup_file_notify(&hugetlb->events_file[idx]); | |
227 | } while ((hugetlb = parent_hugetlb_cgroup(hugetlb)) && | |
228 | !hugetlb_cgroup_is_root(hugetlb)); | |
229 | } | |
230 | ||
1adc4d41 MA |
231 | static int __hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, |
232 | struct hugetlb_cgroup **ptr, | |
233 | bool rsvd) | |
6d76dcf4 AK |
234 | { |
235 | int ret = 0; | |
71f87bee | 236 | struct page_counter *counter; |
6d76dcf4 | 237 | struct hugetlb_cgroup *h_cg = NULL; |
6d76dcf4 AK |
238 | |
239 | if (hugetlb_cgroup_disabled()) | |
240 | goto done; | |
241 | /* | |
242 | * We don't charge any cgroup if the compound page have less | |
243 | * than 3 pages. | |
244 | */ | |
245 | if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) | |
246 | goto done; | |
247 | again: | |
248 | rcu_read_lock(); | |
249 | h_cg = hugetlb_cgroup_from_task(current); | |
0362f326 | 250 | if (!css_tryget(&h_cg->css)) { |
6d76dcf4 AK |
251 | rcu_read_unlock(); |
252 | goto again; | |
253 | } | |
254 | rcu_read_unlock(); | |
255 | ||
1adc4d41 MA |
256 | if (!page_counter_try_charge( |
257 | __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd), | |
258 | nr_pages, &counter)) { | |
6071ca52 | 259 | ret = -ENOMEM; |
726b7bbe | 260 | hugetlb_event(h_cg, idx, HUGETLB_MAX); |
1adc4d41 MA |
261 | css_put(&h_cg->css); |
262 | goto done; | |
faced7e0 | 263 | } |
1adc4d41 MA |
264 | /* Reservations take a reference to the css because they do not get |
265 | * reparented. | |
266 | */ | |
267 | if (!rsvd) | |
268 | css_put(&h_cg->css); | |
6d76dcf4 AK |
269 | done: |
270 | *ptr = h_cg; | |
271 | return ret; | |
272 | } | |
273 | ||
1adc4d41 MA |
274 | int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, |
275 | struct hugetlb_cgroup **ptr) | |
276 | { | |
277 | return __hugetlb_cgroup_charge_cgroup(idx, nr_pages, ptr, false); | |
278 | } | |
279 | ||
280 | int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages, | |
281 | struct hugetlb_cgroup **ptr) | |
282 | { | |
283 | return __hugetlb_cgroup_charge_cgroup(idx, nr_pages, ptr, true); | |
284 | } | |
285 | ||
94ae8ba7 | 286 | /* Should be called with hugetlb_lock held */ |
1adc4d41 MA |
287 | static void __hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, |
288 | struct hugetlb_cgroup *h_cg, | |
289 | struct page *page, bool rsvd) | |
6d76dcf4 AK |
290 | { |
291 | if (hugetlb_cgroup_disabled() || !h_cg) | |
292 | return; | |
293 | ||
1adc4d41 | 294 | __set_hugetlb_cgroup(page, h_cg, rsvd); |
6d76dcf4 AK |
295 | return; |
296 | } | |
297 | ||
1adc4d41 MA |
298 | void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, |
299 | struct hugetlb_cgroup *h_cg, | |
300 | struct page *page) | |
301 | { | |
302 | __hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, page, false); | |
303 | } | |
304 | ||
305 | void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages, | |
306 | struct hugetlb_cgroup *h_cg, | |
307 | struct page *page) | |
308 | { | |
309 | __hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, page, true); | |
310 | } | |
311 | ||
6d76dcf4 AK |
312 | /* |
313 | * Should be called with hugetlb_lock held | |
314 | */ | |
1adc4d41 MA |
315 | static void __hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, |
316 | struct page *page, bool rsvd) | |
6d76dcf4 AK |
317 | { |
318 | struct hugetlb_cgroup *h_cg; | |
6d76dcf4 AK |
319 | |
320 | if (hugetlb_cgroup_disabled()) | |
321 | return; | |
7ea8574e | 322 | lockdep_assert_held(&hugetlb_lock); |
1adc4d41 | 323 | h_cg = __hugetlb_cgroup_from_page(page, rsvd); |
6d76dcf4 AK |
324 | if (unlikely(!h_cg)) |
325 | return; | |
1adc4d41 MA |
326 | __set_hugetlb_cgroup(page, NULL, rsvd); |
327 | ||
328 | page_counter_uncharge(__hugetlb_cgroup_counter_from_cgroup(h_cg, idx, | |
329 | rsvd), | |
330 | nr_pages); | |
331 | ||
332 | if (rsvd) | |
333 | css_put(&h_cg->css); | |
334 | ||
6d76dcf4 AK |
335 | return; |
336 | } | |
337 | ||
1adc4d41 MA |
338 | void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, |
339 | struct page *page) | |
340 | { | |
341 | __hugetlb_cgroup_uncharge_page(idx, nr_pages, page, false); | |
342 | } | |
343 | ||
344 | void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages, | |
345 | struct page *page) | |
346 | { | |
347 | __hugetlb_cgroup_uncharge_page(idx, nr_pages, page, true); | |
348 | } | |
349 | ||
350 | static void __hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, | |
351 | struct hugetlb_cgroup *h_cg, | |
352 | bool rsvd) | |
6d76dcf4 | 353 | { |
6d76dcf4 AK |
354 | if (hugetlb_cgroup_disabled() || !h_cg) |
355 | return; | |
356 | ||
357 | if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) | |
358 | return; | |
359 | ||
1adc4d41 MA |
360 | page_counter_uncharge(__hugetlb_cgroup_counter_from_cgroup(h_cg, idx, |
361 | rsvd), | |
362 | nr_pages); | |
363 | ||
364 | if (rsvd) | |
365 | css_put(&h_cg->css); | |
366 | } | |
367 | ||
368 | void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, | |
369 | struct hugetlb_cgroup *h_cg) | |
370 | { | |
371 | __hugetlb_cgroup_uncharge_cgroup(idx, nr_pages, h_cg, false); | |
372 | } | |
373 | ||
374 | void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages, | |
375 | struct hugetlb_cgroup *h_cg) | |
376 | { | |
377 | __hugetlb_cgroup_uncharge_cgroup(idx, nr_pages, h_cg, true); | |
378 | } | |
379 | ||
e9fe92ae MA |
380 | void hugetlb_cgroup_uncharge_counter(struct resv_map *resv, unsigned long start, |
381 | unsigned long end) | |
1adc4d41 | 382 | { |
e9fe92ae MA |
383 | if (hugetlb_cgroup_disabled() || !resv || !resv->reservation_counter || |
384 | !resv->css) | |
1adc4d41 MA |
385 | return; |
386 | ||
e9fe92ae MA |
387 | page_counter_uncharge(resv->reservation_counter, |
388 | (end - start) * resv->pages_per_hpage); | |
389 | css_put(resv->css); | |
6d76dcf4 AK |
390 | } |
391 | ||
075a61d0 MA |
392 | void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv, |
393 | struct file_region *rg, | |
394 | unsigned long nr_pages) | |
395 | { | |
396 | if (hugetlb_cgroup_disabled() || !resv || !rg || !nr_pages) | |
397 | return; | |
398 | ||
399 | if (rg->reservation_counter && resv->pages_per_hpage && nr_pages > 0 && | |
400 | !resv->reservation_counter) { | |
401 | page_counter_uncharge(rg->reservation_counter, | |
402 | nr_pages * resv->pages_per_hpage); | |
403 | css_put(rg->css); | |
404 | } | |
405 | } | |
406 | ||
71f87bee JW |
407 | enum { |
408 | RES_USAGE, | |
cdc2fcfe | 409 | RES_RSVD_USAGE, |
71f87bee | 410 | RES_LIMIT, |
cdc2fcfe | 411 | RES_RSVD_LIMIT, |
71f87bee | 412 | RES_MAX_USAGE, |
cdc2fcfe | 413 | RES_RSVD_MAX_USAGE, |
71f87bee | 414 | RES_FAILCNT, |
cdc2fcfe | 415 | RES_RSVD_FAILCNT, |
71f87bee JW |
416 | }; |
417 | ||
716f479d TH |
418 | static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css, |
419 | struct cftype *cft) | |
abb8206c | 420 | { |
71f87bee | 421 | struct page_counter *counter; |
cdc2fcfe | 422 | struct page_counter *rsvd_counter; |
182446d0 | 423 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css); |
abb8206c | 424 | |
71f87bee | 425 | counter = &h_cg->hugepage[MEMFILE_IDX(cft->private)]; |
cdc2fcfe | 426 | rsvd_counter = &h_cg->rsvd_hugepage[MEMFILE_IDX(cft->private)]; |
abb8206c | 427 | |
71f87bee JW |
428 | switch (MEMFILE_ATTR(cft->private)) { |
429 | case RES_USAGE: | |
430 | return (u64)page_counter_read(counter) * PAGE_SIZE; | |
cdc2fcfe MA |
431 | case RES_RSVD_USAGE: |
432 | return (u64)page_counter_read(rsvd_counter) * PAGE_SIZE; | |
71f87bee | 433 | case RES_LIMIT: |
bbec2e15 | 434 | return (u64)counter->max * PAGE_SIZE; |
cdc2fcfe MA |
435 | case RES_RSVD_LIMIT: |
436 | return (u64)rsvd_counter->max * PAGE_SIZE; | |
71f87bee JW |
437 | case RES_MAX_USAGE: |
438 | return (u64)counter->watermark * PAGE_SIZE; | |
cdc2fcfe MA |
439 | case RES_RSVD_MAX_USAGE: |
440 | return (u64)rsvd_counter->watermark * PAGE_SIZE; | |
71f87bee JW |
441 | case RES_FAILCNT: |
442 | return counter->failcnt; | |
cdc2fcfe MA |
443 | case RES_RSVD_FAILCNT: |
444 | return rsvd_counter->failcnt; | |
71f87bee JW |
445 | default: |
446 | BUG(); | |
447 | } | |
abb8206c AK |
448 | } |
449 | ||
faced7e0 GS |
450 | static int hugetlb_cgroup_read_u64_max(struct seq_file *seq, void *v) |
451 | { | |
452 | int idx; | |
453 | u64 val; | |
454 | struct cftype *cft = seq_cft(seq); | |
455 | unsigned long limit; | |
456 | struct page_counter *counter; | |
457 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq)); | |
458 | ||
459 | idx = MEMFILE_IDX(cft->private); | |
460 | counter = &h_cg->hugepage[idx]; | |
461 | ||
462 | limit = round_down(PAGE_COUNTER_MAX, | |
8938494c | 463 | pages_per_huge_page(&hstates[idx])); |
faced7e0 GS |
464 | |
465 | switch (MEMFILE_ATTR(cft->private)) { | |
cdc2fcfe MA |
466 | case RES_RSVD_USAGE: |
467 | counter = &h_cg->rsvd_hugepage[idx]; | |
e4a9bc58 | 468 | fallthrough; |
faced7e0 GS |
469 | case RES_USAGE: |
470 | val = (u64)page_counter_read(counter); | |
471 | seq_printf(seq, "%llu\n", val * PAGE_SIZE); | |
472 | break; | |
cdc2fcfe MA |
473 | case RES_RSVD_LIMIT: |
474 | counter = &h_cg->rsvd_hugepage[idx]; | |
e4a9bc58 | 475 | fallthrough; |
faced7e0 GS |
476 | case RES_LIMIT: |
477 | val = (u64)counter->max; | |
478 | if (val == limit) | |
479 | seq_puts(seq, "max\n"); | |
480 | else | |
481 | seq_printf(seq, "%llu\n", val * PAGE_SIZE); | |
482 | break; | |
483 | default: | |
484 | BUG(); | |
485 | } | |
486 | ||
487 | return 0; | |
488 | } | |
489 | ||
71f87bee JW |
490 | static DEFINE_MUTEX(hugetlb_limit_mutex); |
491 | ||
451af504 | 492 | static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of, |
faced7e0 GS |
493 | char *buf, size_t nbytes, loff_t off, |
494 | const char *max) | |
abb8206c | 495 | { |
71f87bee JW |
496 | int ret, idx; |
497 | unsigned long nr_pages; | |
451af504 | 498 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of)); |
cdc2fcfe | 499 | bool rsvd = false; |
abb8206c | 500 | |
71f87bee JW |
501 | if (hugetlb_cgroup_is_root(h_cg)) /* Can't set limit on root */ |
502 | return -EINVAL; | |
503 | ||
451af504 | 504 | buf = strstrip(buf); |
faced7e0 | 505 | ret = page_counter_memparse(buf, max, &nr_pages); |
71f87bee JW |
506 | if (ret) |
507 | return ret; | |
508 | ||
451af504 | 509 | idx = MEMFILE_IDX(of_cft(of)->private); |
8938494c | 510 | nr_pages = round_down(nr_pages, pages_per_huge_page(&hstates[idx])); |
abb8206c | 511 | |
71f87bee | 512 | switch (MEMFILE_ATTR(of_cft(of)->private)) { |
cdc2fcfe MA |
513 | case RES_RSVD_LIMIT: |
514 | rsvd = true; | |
e4a9bc58 | 515 | fallthrough; |
abb8206c | 516 | case RES_LIMIT: |
71f87bee | 517 | mutex_lock(&hugetlb_limit_mutex); |
cdc2fcfe | 518 | ret = page_counter_set_max( |
1adc4d41 | 519 | __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd), |
cdc2fcfe | 520 | nr_pages); |
71f87bee | 521 | mutex_unlock(&hugetlb_limit_mutex); |
abb8206c AK |
522 | break; |
523 | default: | |
524 | ret = -EINVAL; | |
525 | break; | |
526 | } | |
451af504 | 527 | return ret ?: nbytes; |
abb8206c AK |
528 | } |
529 | ||
faced7e0 GS |
530 | static ssize_t hugetlb_cgroup_write_legacy(struct kernfs_open_file *of, |
531 | char *buf, size_t nbytes, loff_t off) | |
532 | { | |
533 | return hugetlb_cgroup_write(of, buf, nbytes, off, "-1"); | |
534 | } | |
535 | ||
536 | static ssize_t hugetlb_cgroup_write_dfl(struct kernfs_open_file *of, | |
537 | char *buf, size_t nbytes, loff_t off) | |
538 | { | |
539 | return hugetlb_cgroup_write(of, buf, nbytes, off, "max"); | |
540 | } | |
541 | ||
6770c64e TH |
542 | static ssize_t hugetlb_cgroup_reset(struct kernfs_open_file *of, |
543 | char *buf, size_t nbytes, loff_t off) | |
abb8206c | 544 | { |
71f87bee | 545 | int ret = 0; |
cdc2fcfe | 546 | struct page_counter *counter, *rsvd_counter; |
6770c64e | 547 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of)); |
abb8206c | 548 | |
71f87bee | 549 | counter = &h_cg->hugepage[MEMFILE_IDX(of_cft(of)->private)]; |
cdc2fcfe | 550 | rsvd_counter = &h_cg->rsvd_hugepage[MEMFILE_IDX(of_cft(of)->private)]; |
abb8206c | 551 | |
71f87bee | 552 | switch (MEMFILE_ATTR(of_cft(of)->private)) { |
abb8206c | 553 | case RES_MAX_USAGE: |
71f87bee | 554 | page_counter_reset_watermark(counter); |
abb8206c | 555 | break; |
cdc2fcfe MA |
556 | case RES_RSVD_MAX_USAGE: |
557 | page_counter_reset_watermark(rsvd_counter); | |
558 | break; | |
abb8206c | 559 | case RES_FAILCNT: |
71f87bee | 560 | counter->failcnt = 0; |
abb8206c | 561 | break; |
cdc2fcfe MA |
562 | case RES_RSVD_FAILCNT: |
563 | rsvd_counter->failcnt = 0; | |
564 | break; | |
abb8206c AK |
565 | default: |
566 | ret = -EINVAL; | |
567 | break; | |
568 | } | |
6770c64e | 569 | return ret ?: nbytes; |
abb8206c AK |
570 | } |
571 | ||
572 | static char *mem_fmt(char *buf, int size, unsigned long hsize) | |
573 | { | |
574 | if (hsize >= (1UL << 30)) | |
575 | snprintf(buf, size, "%luGB", hsize >> 30); | |
576 | else if (hsize >= (1UL << 20)) | |
577 | snprintf(buf, size, "%luMB", hsize >> 20); | |
578 | else | |
579 | snprintf(buf, size, "%luKB", hsize >> 10); | |
580 | return buf; | |
581 | } | |
582 | ||
faced7e0 GS |
583 | static int __hugetlb_events_show(struct seq_file *seq, bool local) |
584 | { | |
585 | int idx; | |
586 | long max; | |
587 | struct cftype *cft = seq_cft(seq); | |
588 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq)); | |
589 | ||
590 | idx = MEMFILE_IDX(cft->private); | |
591 | ||
592 | if (local) | |
593 | max = atomic_long_read(&h_cg->events_local[idx][HUGETLB_MAX]); | |
594 | else | |
595 | max = atomic_long_read(&h_cg->events[idx][HUGETLB_MAX]); | |
596 | ||
597 | seq_printf(seq, "max %lu\n", max); | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
602 | static int hugetlb_events_show(struct seq_file *seq, void *v) | |
603 | { | |
604 | return __hugetlb_events_show(seq, false); | |
605 | } | |
606 | ||
607 | static int hugetlb_events_local_show(struct seq_file *seq, void *v) | |
608 | { | |
609 | return __hugetlb_events_show(seq, true); | |
610 | } | |
611 | ||
612 | static void __init __hugetlb_cgroup_file_dfl_init(int idx) | |
abb8206c AK |
613 | { |
614 | char buf[32]; | |
615 | struct cftype *cft; | |
616 | struct hstate *h = &hstates[idx]; | |
617 | ||
618 | /* format the size */ | |
cdc2fcfe | 619 | mem_fmt(buf, sizeof(buf), huge_page_size(h)); |
abb8206c AK |
620 | |
621 | /* Add the limit file */ | |
faced7e0 GS |
622 | cft = &h->cgroup_files_dfl[0]; |
623 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max", buf); | |
624 | cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT); | |
625 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
626 | cft->write = hugetlb_cgroup_write_dfl; | |
627 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
628 | ||
cdc2fcfe | 629 | /* Add the reservation limit file */ |
faced7e0 | 630 | cft = &h->cgroup_files_dfl[1]; |
cdc2fcfe MA |
631 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.max", buf); |
632 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_LIMIT); | |
633 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
634 | cft->write = hugetlb_cgroup_write_dfl; | |
635 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
636 | ||
637 | /* Add the current usage file */ | |
638 | cft = &h->cgroup_files_dfl[2]; | |
faced7e0 GS |
639 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.current", buf); |
640 | cft->private = MEMFILE_PRIVATE(idx, RES_USAGE); | |
641 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
642 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
643 | ||
cdc2fcfe MA |
644 | /* Add the current reservation usage file */ |
645 | cft = &h->cgroup_files_dfl[3]; | |
646 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.current", buf); | |
647 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_USAGE); | |
648 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
649 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
650 | ||
faced7e0 | 651 | /* Add the events file */ |
cdc2fcfe | 652 | cft = &h->cgroup_files_dfl[4]; |
faced7e0 GS |
653 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events", buf); |
654 | cft->private = MEMFILE_PRIVATE(idx, 0); | |
655 | cft->seq_show = hugetlb_events_show; | |
d5a16959 | 656 | cft->file_offset = offsetof(struct hugetlb_cgroup, events_file[idx]); |
faced7e0 GS |
657 | cft->flags = CFTYPE_NOT_ON_ROOT; |
658 | ||
659 | /* Add the events.local file */ | |
cdc2fcfe | 660 | cft = &h->cgroup_files_dfl[5]; |
faced7e0 GS |
661 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events.local", buf); |
662 | cft->private = MEMFILE_PRIVATE(idx, 0); | |
663 | cft->seq_show = hugetlb_events_local_show; | |
664 | cft->file_offset = offsetof(struct hugetlb_cgroup, | |
d5a16959 | 665 | events_local_file[idx]); |
faced7e0 GS |
666 | cft->flags = CFTYPE_NOT_ON_ROOT; |
667 | ||
668 | /* NULL terminate the last cft */ | |
cdc2fcfe | 669 | cft = &h->cgroup_files_dfl[6]; |
faced7e0 GS |
670 | memset(cft, 0, sizeof(*cft)); |
671 | ||
672 | WARN_ON(cgroup_add_dfl_cftypes(&hugetlb_cgrp_subsys, | |
673 | h->cgroup_files_dfl)); | |
674 | } | |
675 | ||
676 | static void __init __hugetlb_cgroup_file_legacy_init(int idx) | |
677 | { | |
678 | char buf[32]; | |
679 | struct cftype *cft; | |
680 | struct hstate *h = &hstates[idx]; | |
681 | ||
682 | /* format the size */ | |
cdc2fcfe | 683 | mem_fmt(buf, sizeof(buf), huge_page_size(h)); |
faced7e0 GS |
684 | |
685 | /* Add the limit file */ | |
686 | cft = &h->cgroup_files_legacy[0]; | |
abb8206c AK |
687 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf); |
688 | cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT); | |
716f479d | 689 | cft->read_u64 = hugetlb_cgroup_read_u64; |
faced7e0 | 690 | cft->write = hugetlb_cgroup_write_legacy; |
abb8206c | 691 | |
cdc2fcfe | 692 | /* Add the reservation limit file */ |
faced7e0 | 693 | cft = &h->cgroup_files_legacy[1]; |
cdc2fcfe MA |
694 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.limit_in_bytes", buf); |
695 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_LIMIT); | |
696 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
697 | cft->write = hugetlb_cgroup_write_legacy; | |
698 | ||
699 | /* Add the usage file */ | |
700 | cft = &h->cgroup_files_legacy[2]; | |
abb8206c AK |
701 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf); |
702 | cft->private = MEMFILE_PRIVATE(idx, RES_USAGE); | |
716f479d | 703 | cft->read_u64 = hugetlb_cgroup_read_u64; |
abb8206c | 704 | |
cdc2fcfe MA |
705 | /* Add the reservation usage file */ |
706 | cft = &h->cgroup_files_legacy[3]; | |
707 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.usage_in_bytes", buf); | |
708 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_USAGE); | |
709 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
710 | ||
abb8206c | 711 | /* Add the MAX usage file */ |
cdc2fcfe | 712 | cft = &h->cgroup_files_legacy[4]; |
abb8206c AK |
713 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf); |
714 | cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE); | |
6770c64e | 715 | cft->write = hugetlb_cgroup_reset; |
716f479d | 716 | cft->read_u64 = hugetlb_cgroup_read_u64; |
abb8206c | 717 | |
cdc2fcfe MA |
718 | /* Add the MAX reservation usage file */ |
719 | cft = &h->cgroup_files_legacy[5]; | |
720 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.max_usage_in_bytes", buf); | |
721 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_MAX_USAGE); | |
722 | cft->write = hugetlb_cgroup_reset; | |
723 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
724 | ||
abb8206c | 725 | /* Add the failcntfile */ |
cdc2fcfe | 726 | cft = &h->cgroup_files_legacy[6]; |
abb8206c | 727 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf); |
cdc2fcfe MA |
728 | cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT); |
729 | cft->write = hugetlb_cgroup_reset; | |
730 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
731 | ||
732 | /* Add the reservation failcntfile */ | |
733 | cft = &h->cgroup_files_legacy[7]; | |
734 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.failcnt", buf); | |
735 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_FAILCNT); | |
6770c64e | 736 | cft->write = hugetlb_cgroup_reset; |
716f479d | 737 | cft->read_u64 = hugetlb_cgroup_read_u64; |
abb8206c AK |
738 | |
739 | /* NULL terminate the last cft */ | |
cdc2fcfe | 740 | cft = &h->cgroup_files_legacy[8]; |
abb8206c AK |
741 | memset(cft, 0, sizeof(*cft)); |
742 | ||
2cf669a5 | 743 | WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys, |
faced7e0 GS |
744 | h->cgroup_files_legacy)); |
745 | } | |
746 | ||
747 | static void __init __hugetlb_cgroup_file_init(int idx) | |
748 | { | |
749 | __hugetlb_cgroup_file_dfl_init(idx); | |
750 | __hugetlb_cgroup_file_legacy_init(idx); | |
7179e7bf JW |
751 | } |
752 | ||
753 | void __init hugetlb_cgroup_file_init(void) | |
754 | { | |
755 | struct hstate *h; | |
756 | ||
757 | for_each_hstate(h) { | |
758 | /* | |
759 | * Add cgroup control files only if the huge page consists | |
760 | * of more than two normal pages. This is because we use | |
1d798ca3 | 761 | * page[2].private for storing cgroup details. |
7179e7bf JW |
762 | */ |
763 | if (huge_page_order(h) >= HUGETLB_CGROUP_MIN_ORDER) | |
764 | __hugetlb_cgroup_file_init(hstate_index(h)); | |
765 | } | |
abb8206c AK |
766 | } |
767 | ||
75754681 AK |
768 | /* |
769 | * hugetlb_lock will make sure a parallel cgroup rmdir won't happen | |
770 | * when we migrate hugepages | |
771 | */ | |
8e6ac7fa AK |
772 | void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage) |
773 | { | |
774 | struct hugetlb_cgroup *h_cg; | |
1adc4d41 | 775 | struct hugetlb_cgroup *h_cg_rsvd; |
94ae8ba7 | 776 | struct hstate *h = page_hstate(oldhpage); |
8e6ac7fa AK |
777 | |
778 | if (hugetlb_cgroup_disabled()) | |
779 | return; | |
780 | ||
309381fe | 781 | VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage); |
8e6ac7fa AK |
782 | spin_lock(&hugetlb_lock); |
783 | h_cg = hugetlb_cgroup_from_page(oldhpage); | |
1adc4d41 | 784 | h_cg_rsvd = hugetlb_cgroup_from_page_rsvd(oldhpage); |
8e6ac7fa | 785 | set_hugetlb_cgroup(oldhpage, NULL); |
9808895e | 786 | set_hugetlb_cgroup_rsvd(oldhpage, NULL); |
8e6ac7fa AK |
787 | |
788 | /* move the h_cg details to new cgroup */ | |
9808895e | 789 | set_hugetlb_cgroup(newhpage, h_cg); |
1adc4d41 | 790 | set_hugetlb_cgroup_rsvd(newhpage, h_cg_rsvd); |
94ae8ba7 | 791 | list_move(&newhpage->lru, &h->hugepage_activelist); |
8e6ac7fa | 792 | spin_unlock(&hugetlb_lock); |
8e6ac7fa AK |
793 | return; |
794 | } | |
795 | ||
faced7e0 GS |
796 | static struct cftype hugetlb_files[] = { |
797 | {} /* terminate */ | |
798 | }; | |
799 | ||
073219e9 | 800 | struct cgroup_subsys hugetlb_cgrp_subsys = { |
92fb9748 TH |
801 | .css_alloc = hugetlb_cgroup_css_alloc, |
802 | .css_offline = hugetlb_cgroup_css_offline, | |
803 | .css_free = hugetlb_cgroup_css_free, | |
faced7e0 GS |
804 | .dfl_cftypes = hugetlb_files, |
805 | .legacy_cftypes = hugetlb_files, | |
2bc64a20 | 806 | }; |