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 MA |
84 | if (page_counter_read( |
85 | hugetlb_cgroup_counter_from_cgroup(h_cg, idx)) || | |
86 | page_counter_read(hugetlb_cgroup_counter_from_cgroup_rsvd( | |
87 | h_cg, idx))) { | |
2bc64a20 | 88 | return true; |
1adc4d41 | 89 | } |
2bc64a20 AK |
90 | } |
91 | return false; | |
92 | } | |
93 | ||
297880f4 DR |
94 | static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup, |
95 | struct hugetlb_cgroup *parent_h_cgroup) | |
96 | { | |
97 | int idx; | |
98 | ||
99 | for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) { | |
1adc4d41 MA |
100 | struct page_counter *fault_parent = NULL; |
101 | struct page_counter *rsvd_parent = NULL; | |
297880f4 DR |
102 | unsigned long limit; |
103 | int ret; | |
104 | ||
1adc4d41 MA |
105 | if (parent_h_cgroup) { |
106 | fault_parent = hugetlb_cgroup_counter_from_cgroup( | |
107 | parent_h_cgroup, idx); | |
108 | rsvd_parent = hugetlb_cgroup_counter_from_cgroup_rsvd( | |
109 | parent_h_cgroup, idx); | |
110 | } | |
111 | page_counter_init(hugetlb_cgroup_counter_from_cgroup(h_cgroup, | |
112 | idx), | |
113 | fault_parent); | |
114 | page_counter_init( | |
115 | hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx), | |
116 | rsvd_parent); | |
297880f4 DR |
117 | |
118 | limit = round_down(PAGE_COUNTER_MAX, | |
119 | 1 << huge_page_order(&hstates[idx])); | |
1adc4d41 MA |
120 | |
121 | ret = page_counter_set_max( | |
122 | hugetlb_cgroup_counter_from_cgroup(h_cgroup, idx), | |
123 | limit); | |
124 | VM_BUG_ON(ret); | |
125 | ret = page_counter_set_max( | |
126 | hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx), | |
127 | limit); | |
297880f4 DR |
128 | VM_BUG_ON(ret); |
129 | } | |
130 | } | |
131 | ||
eb95419b TH |
132 | static struct cgroup_subsys_state * |
133 | hugetlb_cgroup_css_alloc(struct cgroup_subsys_state *parent_css) | |
2bc64a20 | 134 | { |
eb95419b TH |
135 | struct hugetlb_cgroup *parent_h_cgroup = hugetlb_cgroup_from_css(parent_css); |
136 | struct hugetlb_cgroup *h_cgroup; | |
2bc64a20 AK |
137 | |
138 | h_cgroup = kzalloc(sizeof(*h_cgroup), GFP_KERNEL); | |
139 | if (!h_cgroup) | |
140 | return ERR_PTR(-ENOMEM); | |
141 | ||
297880f4 | 142 | if (!parent_h_cgroup) |
2bc64a20 | 143 | root_h_cgroup = h_cgroup; |
297880f4 DR |
144 | |
145 | hugetlb_cgroup_init(h_cgroup, parent_h_cgroup); | |
2bc64a20 AK |
146 | return &h_cgroup->css; |
147 | } | |
148 | ||
eb95419b | 149 | static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css) |
2bc64a20 AK |
150 | { |
151 | struct hugetlb_cgroup *h_cgroup; | |
152 | ||
eb95419b | 153 | h_cgroup = hugetlb_cgroup_from_css(css); |
2bc64a20 AK |
154 | kfree(h_cgroup); |
155 | } | |
156 | ||
da1def55 AK |
157 | /* |
158 | * Should be called with hugetlb_lock held. | |
159 | * Since we are holding hugetlb_lock, pages cannot get moved from | |
160 | * active list or uncharged from the cgroup, So no need to get | |
161 | * page reference and test for page active here. This function | |
162 | * cannot fail. | |
163 | */ | |
3f798518 | 164 | static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg, |
da1def55 AK |
165 | struct page *page) |
166 | { | |
71f87bee JW |
167 | unsigned int nr_pages; |
168 | struct page_counter *counter; | |
da1def55 | 169 | struct hugetlb_cgroup *page_hcg; |
3f798518 | 170 | struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg); |
da1def55 AK |
171 | |
172 | page_hcg = hugetlb_cgroup_from_page(page); | |
173 | /* | |
174 | * We can have pages in active list without any cgroup | |
175 | * ie, hugepage with less than 3 pages. We can safely | |
176 | * ignore those pages. | |
177 | */ | |
178 | if (!page_hcg || page_hcg != h_cg) | |
179 | goto out; | |
180 | ||
d8c6546b | 181 | nr_pages = compound_nr(page); |
da1def55 AK |
182 | if (!parent) { |
183 | parent = root_h_cgroup; | |
184 | /* root has no limit */ | |
71f87bee | 185 | page_counter_charge(&parent->hugepage[idx], nr_pages); |
da1def55 AK |
186 | } |
187 | counter = &h_cg->hugepage[idx]; | |
71f87bee JW |
188 | /* Take the pages off the local counter */ |
189 | page_counter_cancel(counter, nr_pages); | |
da1def55 AK |
190 | |
191 | set_hugetlb_cgroup(page, parent); | |
192 | out: | |
193 | return; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Force the hugetlb cgroup to empty the hugetlb resources by moving them to | |
198 | * the parent cgroup. | |
199 | */ | |
eb95419b | 200 | static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css) |
2bc64a20 | 201 | { |
eb95419b | 202 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css); |
da1def55 AK |
203 | struct hstate *h; |
204 | struct page *page; | |
9d093cb1 | 205 | int idx = 0; |
da1def55 AK |
206 | |
207 | do { | |
da1def55 AK |
208 | for_each_hstate(h) { |
209 | spin_lock(&hugetlb_lock); | |
210 | list_for_each_entry(page, &h->hugepage_activelist, lru) | |
3f798518 | 211 | hugetlb_cgroup_move_parent(idx, h_cg, page); |
da1def55 AK |
212 | |
213 | spin_unlock(&hugetlb_lock); | |
214 | idx++; | |
215 | } | |
216 | cond_resched(); | |
3f798518 | 217 | } while (hugetlb_cgroup_have_usage(h_cg)); |
2bc64a20 AK |
218 | } |
219 | ||
faced7e0 GS |
220 | static inline void hugetlb_event(struct hugetlb_cgroup *hugetlb, int idx, |
221 | enum hugetlb_memory_event event) | |
222 | { | |
223 | atomic_long_inc(&hugetlb->events_local[idx][event]); | |
224 | cgroup_file_notify(&hugetlb->events_local_file[idx]); | |
225 | ||
226 | do { | |
227 | atomic_long_inc(&hugetlb->events[idx][event]); | |
228 | cgroup_file_notify(&hugetlb->events_file[idx]); | |
229 | } while ((hugetlb = parent_hugetlb_cgroup(hugetlb)) && | |
230 | !hugetlb_cgroup_is_root(hugetlb)); | |
231 | } | |
232 | ||
1adc4d41 MA |
233 | static int __hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, |
234 | struct hugetlb_cgroup **ptr, | |
235 | bool rsvd) | |
6d76dcf4 AK |
236 | { |
237 | int ret = 0; | |
71f87bee | 238 | struct page_counter *counter; |
6d76dcf4 | 239 | struct hugetlb_cgroup *h_cg = NULL; |
6d76dcf4 AK |
240 | |
241 | if (hugetlb_cgroup_disabled()) | |
242 | goto done; | |
243 | /* | |
244 | * We don't charge any cgroup if the compound page have less | |
245 | * than 3 pages. | |
246 | */ | |
247 | if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) | |
248 | goto done; | |
249 | again: | |
250 | rcu_read_lock(); | |
251 | h_cg = hugetlb_cgroup_from_task(current); | |
0362f326 | 252 | if (!css_tryget(&h_cg->css)) { |
6d76dcf4 AK |
253 | rcu_read_unlock(); |
254 | goto again; | |
255 | } | |
256 | rcu_read_unlock(); | |
257 | ||
1adc4d41 MA |
258 | if (!page_counter_try_charge( |
259 | __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd), | |
260 | nr_pages, &counter)) { | |
6071ca52 | 261 | ret = -ENOMEM; |
726b7bbe | 262 | hugetlb_event(h_cg, idx, HUGETLB_MAX); |
1adc4d41 MA |
263 | css_put(&h_cg->css); |
264 | goto done; | |
faced7e0 | 265 | } |
1adc4d41 MA |
266 | /* Reservations take a reference to the css because they do not get |
267 | * reparented. | |
268 | */ | |
269 | if (!rsvd) | |
270 | css_put(&h_cg->css); | |
6d76dcf4 AK |
271 | done: |
272 | *ptr = h_cg; | |
273 | return ret; | |
274 | } | |
275 | ||
1adc4d41 MA |
276 | int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, |
277 | struct hugetlb_cgroup **ptr) | |
278 | { | |
279 | return __hugetlb_cgroup_charge_cgroup(idx, nr_pages, ptr, false); | |
280 | } | |
281 | ||
282 | int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages, | |
283 | struct hugetlb_cgroup **ptr) | |
284 | { | |
285 | return __hugetlb_cgroup_charge_cgroup(idx, nr_pages, ptr, true); | |
286 | } | |
287 | ||
94ae8ba7 | 288 | /* Should be called with hugetlb_lock held */ |
1adc4d41 MA |
289 | static void __hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, |
290 | struct hugetlb_cgroup *h_cg, | |
291 | struct page *page, bool rsvd) | |
6d76dcf4 AK |
292 | { |
293 | if (hugetlb_cgroup_disabled() || !h_cg) | |
294 | return; | |
295 | ||
1adc4d41 | 296 | __set_hugetlb_cgroup(page, h_cg, rsvd); |
6d76dcf4 AK |
297 | return; |
298 | } | |
299 | ||
1adc4d41 MA |
300 | void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, |
301 | struct hugetlb_cgroup *h_cg, | |
302 | struct page *page) | |
303 | { | |
304 | __hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, page, false); | |
305 | } | |
306 | ||
307 | void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages, | |
308 | struct hugetlb_cgroup *h_cg, | |
309 | struct page *page) | |
310 | { | |
311 | __hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, page, true); | |
312 | } | |
313 | ||
6d76dcf4 AK |
314 | /* |
315 | * Should be called with hugetlb_lock held | |
316 | */ | |
1adc4d41 MA |
317 | static void __hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, |
318 | struct page *page, bool rsvd) | |
6d76dcf4 AK |
319 | { |
320 | struct hugetlb_cgroup *h_cg; | |
6d76dcf4 AK |
321 | |
322 | if (hugetlb_cgroup_disabled()) | |
323 | return; | |
7ea8574e | 324 | lockdep_assert_held(&hugetlb_lock); |
1adc4d41 | 325 | h_cg = __hugetlb_cgroup_from_page(page, rsvd); |
6d76dcf4 AK |
326 | if (unlikely(!h_cg)) |
327 | return; | |
1adc4d41 MA |
328 | __set_hugetlb_cgroup(page, NULL, rsvd); |
329 | ||
330 | page_counter_uncharge(__hugetlb_cgroup_counter_from_cgroup(h_cg, idx, | |
331 | rsvd), | |
332 | nr_pages); | |
333 | ||
334 | if (rsvd) | |
335 | css_put(&h_cg->css); | |
336 | ||
6d76dcf4 AK |
337 | return; |
338 | } | |
339 | ||
1adc4d41 MA |
340 | void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, |
341 | struct page *page) | |
342 | { | |
343 | __hugetlb_cgroup_uncharge_page(idx, nr_pages, page, false); | |
344 | } | |
345 | ||
346 | void hugetlb_cgroup_uncharge_page_rsvd(int idx, unsigned long nr_pages, | |
347 | struct page *page) | |
348 | { | |
349 | __hugetlb_cgroup_uncharge_page(idx, nr_pages, page, true); | |
350 | } | |
351 | ||
352 | static void __hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, | |
353 | struct hugetlb_cgroup *h_cg, | |
354 | bool rsvd) | |
6d76dcf4 | 355 | { |
6d76dcf4 AK |
356 | if (hugetlb_cgroup_disabled() || !h_cg) |
357 | return; | |
358 | ||
359 | if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) | |
360 | return; | |
361 | ||
1adc4d41 MA |
362 | page_counter_uncharge(__hugetlb_cgroup_counter_from_cgroup(h_cg, idx, |
363 | rsvd), | |
364 | nr_pages); | |
365 | ||
366 | if (rsvd) | |
367 | css_put(&h_cg->css); | |
368 | } | |
369 | ||
370 | void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, | |
371 | struct hugetlb_cgroup *h_cg) | |
372 | { | |
373 | __hugetlb_cgroup_uncharge_cgroup(idx, nr_pages, h_cg, false); | |
374 | } | |
375 | ||
376 | void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages, | |
377 | struct hugetlb_cgroup *h_cg) | |
378 | { | |
379 | __hugetlb_cgroup_uncharge_cgroup(idx, nr_pages, h_cg, true); | |
380 | } | |
381 | ||
e9fe92ae MA |
382 | void hugetlb_cgroup_uncharge_counter(struct resv_map *resv, unsigned long start, |
383 | unsigned long end) | |
1adc4d41 | 384 | { |
e9fe92ae MA |
385 | if (hugetlb_cgroup_disabled() || !resv || !resv->reservation_counter || |
386 | !resv->css) | |
1adc4d41 MA |
387 | return; |
388 | ||
e9fe92ae MA |
389 | page_counter_uncharge(resv->reservation_counter, |
390 | (end - start) * resv->pages_per_hpage); | |
391 | css_put(resv->css); | |
6d76dcf4 AK |
392 | } |
393 | ||
075a61d0 MA |
394 | void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv, |
395 | struct file_region *rg, | |
396 | unsigned long nr_pages) | |
397 | { | |
398 | if (hugetlb_cgroup_disabled() || !resv || !rg || !nr_pages) | |
399 | return; | |
400 | ||
401 | if (rg->reservation_counter && resv->pages_per_hpage && nr_pages > 0 && | |
402 | !resv->reservation_counter) { | |
403 | page_counter_uncharge(rg->reservation_counter, | |
404 | nr_pages * resv->pages_per_hpage); | |
405 | css_put(rg->css); | |
406 | } | |
407 | } | |
408 | ||
71f87bee JW |
409 | enum { |
410 | RES_USAGE, | |
cdc2fcfe | 411 | RES_RSVD_USAGE, |
71f87bee | 412 | RES_LIMIT, |
cdc2fcfe | 413 | RES_RSVD_LIMIT, |
71f87bee | 414 | RES_MAX_USAGE, |
cdc2fcfe | 415 | RES_RSVD_MAX_USAGE, |
71f87bee | 416 | RES_FAILCNT, |
cdc2fcfe | 417 | RES_RSVD_FAILCNT, |
71f87bee JW |
418 | }; |
419 | ||
716f479d TH |
420 | static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css, |
421 | struct cftype *cft) | |
abb8206c | 422 | { |
71f87bee | 423 | struct page_counter *counter; |
cdc2fcfe | 424 | struct page_counter *rsvd_counter; |
182446d0 | 425 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css); |
abb8206c | 426 | |
71f87bee | 427 | counter = &h_cg->hugepage[MEMFILE_IDX(cft->private)]; |
cdc2fcfe | 428 | rsvd_counter = &h_cg->rsvd_hugepage[MEMFILE_IDX(cft->private)]; |
abb8206c | 429 | |
71f87bee JW |
430 | switch (MEMFILE_ATTR(cft->private)) { |
431 | case RES_USAGE: | |
432 | return (u64)page_counter_read(counter) * PAGE_SIZE; | |
cdc2fcfe MA |
433 | case RES_RSVD_USAGE: |
434 | return (u64)page_counter_read(rsvd_counter) * PAGE_SIZE; | |
71f87bee | 435 | case RES_LIMIT: |
bbec2e15 | 436 | return (u64)counter->max * PAGE_SIZE; |
cdc2fcfe MA |
437 | case RES_RSVD_LIMIT: |
438 | return (u64)rsvd_counter->max * PAGE_SIZE; | |
71f87bee JW |
439 | case RES_MAX_USAGE: |
440 | return (u64)counter->watermark * PAGE_SIZE; | |
cdc2fcfe MA |
441 | case RES_RSVD_MAX_USAGE: |
442 | return (u64)rsvd_counter->watermark * PAGE_SIZE; | |
71f87bee JW |
443 | case RES_FAILCNT: |
444 | return counter->failcnt; | |
cdc2fcfe MA |
445 | case RES_RSVD_FAILCNT: |
446 | return rsvd_counter->failcnt; | |
71f87bee JW |
447 | default: |
448 | BUG(); | |
449 | } | |
abb8206c AK |
450 | } |
451 | ||
faced7e0 GS |
452 | static int hugetlb_cgroup_read_u64_max(struct seq_file *seq, void *v) |
453 | { | |
454 | int idx; | |
455 | u64 val; | |
456 | struct cftype *cft = seq_cft(seq); | |
457 | unsigned long limit; | |
458 | struct page_counter *counter; | |
459 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq)); | |
460 | ||
461 | idx = MEMFILE_IDX(cft->private); | |
462 | counter = &h_cg->hugepage[idx]; | |
463 | ||
464 | limit = round_down(PAGE_COUNTER_MAX, | |
465 | 1 << huge_page_order(&hstates[idx])); | |
466 | ||
467 | switch (MEMFILE_ATTR(cft->private)) { | |
cdc2fcfe MA |
468 | case RES_RSVD_USAGE: |
469 | counter = &h_cg->rsvd_hugepage[idx]; | |
e4a9bc58 | 470 | fallthrough; |
faced7e0 GS |
471 | case RES_USAGE: |
472 | val = (u64)page_counter_read(counter); | |
473 | seq_printf(seq, "%llu\n", val * PAGE_SIZE); | |
474 | break; | |
cdc2fcfe MA |
475 | case RES_RSVD_LIMIT: |
476 | counter = &h_cg->rsvd_hugepage[idx]; | |
e4a9bc58 | 477 | fallthrough; |
faced7e0 GS |
478 | case RES_LIMIT: |
479 | val = (u64)counter->max; | |
480 | if (val == limit) | |
481 | seq_puts(seq, "max\n"); | |
482 | else | |
483 | seq_printf(seq, "%llu\n", val * PAGE_SIZE); | |
484 | break; | |
485 | default: | |
486 | BUG(); | |
487 | } | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
71f87bee JW |
492 | static DEFINE_MUTEX(hugetlb_limit_mutex); |
493 | ||
451af504 | 494 | static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of, |
faced7e0 GS |
495 | char *buf, size_t nbytes, loff_t off, |
496 | const char *max) | |
abb8206c | 497 | { |
71f87bee JW |
498 | int ret, idx; |
499 | unsigned long nr_pages; | |
451af504 | 500 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of)); |
cdc2fcfe | 501 | bool rsvd = false; |
abb8206c | 502 | |
71f87bee JW |
503 | if (hugetlb_cgroup_is_root(h_cg)) /* Can't set limit on root */ |
504 | return -EINVAL; | |
505 | ||
451af504 | 506 | buf = strstrip(buf); |
faced7e0 | 507 | ret = page_counter_memparse(buf, max, &nr_pages); |
71f87bee JW |
508 | if (ret) |
509 | return ret; | |
510 | ||
451af504 | 511 | idx = MEMFILE_IDX(of_cft(of)->private); |
297880f4 | 512 | nr_pages = round_down(nr_pages, 1 << huge_page_order(&hstates[idx])); |
abb8206c | 513 | |
71f87bee | 514 | switch (MEMFILE_ATTR(of_cft(of)->private)) { |
cdc2fcfe MA |
515 | case RES_RSVD_LIMIT: |
516 | rsvd = true; | |
e4a9bc58 | 517 | fallthrough; |
abb8206c | 518 | case RES_LIMIT: |
71f87bee | 519 | mutex_lock(&hugetlb_limit_mutex); |
cdc2fcfe | 520 | ret = page_counter_set_max( |
1adc4d41 | 521 | __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd), |
cdc2fcfe | 522 | nr_pages); |
71f87bee | 523 | mutex_unlock(&hugetlb_limit_mutex); |
abb8206c AK |
524 | break; |
525 | default: | |
526 | ret = -EINVAL; | |
527 | break; | |
528 | } | |
451af504 | 529 | return ret ?: nbytes; |
abb8206c AK |
530 | } |
531 | ||
faced7e0 GS |
532 | static ssize_t hugetlb_cgroup_write_legacy(struct kernfs_open_file *of, |
533 | char *buf, size_t nbytes, loff_t off) | |
534 | { | |
535 | return hugetlb_cgroup_write(of, buf, nbytes, off, "-1"); | |
536 | } | |
537 | ||
538 | static ssize_t hugetlb_cgroup_write_dfl(struct kernfs_open_file *of, | |
539 | char *buf, size_t nbytes, loff_t off) | |
540 | { | |
541 | return hugetlb_cgroup_write(of, buf, nbytes, off, "max"); | |
542 | } | |
543 | ||
6770c64e TH |
544 | static ssize_t hugetlb_cgroup_reset(struct kernfs_open_file *of, |
545 | char *buf, size_t nbytes, loff_t off) | |
abb8206c | 546 | { |
71f87bee | 547 | int ret = 0; |
cdc2fcfe | 548 | struct page_counter *counter, *rsvd_counter; |
6770c64e | 549 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of)); |
abb8206c | 550 | |
71f87bee | 551 | counter = &h_cg->hugepage[MEMFILE_IDX(of_cft(of)->private)]; |
cdc2fcfe | 552 | rsvd_counter = &h_cg->rsvd_hugepage[MEMFILE_IDX(of_cft(of)->private)]; |
abb8206c | 553 | |
71f87bee | 554 | switch (MEMFILE_ATTR(of_cft(of)->private)) { |
abb8206c | 555 | case RES_MAX_USAGE: |
71f87bee | 556 | page_counter_reset_watermark(counter); |
abb8206c | 557 | break; |
cdc2fcfe MA |
558 | case RES_RSVD_MAX_USAGE: |
559 | page_counter_reset_watermark(rsvd_counter); | |
560 | break; | |
abb8206c | 561 | case RES_FAILCNT: |
71f87bee | 562 | counter->failcnt = 0; |
abb8206c | 563 | break; |
cdc2fcfe MA |
564 | case RES_RSVD_FAILCNT: |
565 | rsvd_counter->failcnt = 0; | |
566 | break; | |
abb8206c AK |
567 | default: |
568 | ret = -EINVAL; | |
569 | break; | |
570 | } | |
6770c64e | 571 | return ret ?: nbytes; |
abb8206c AK |
572 | } |
573 | ||
574 | static char *mem_fmt(char *buf, int size, unsigned long hsize) | |
575 | { | |
576 | if (hsize >= (1UL << 30)) | |
577 | snprintf(buf, size, "%luGB", hsize >> 30); | |
578 | else if (hsize >= (1UL << 20)) | |
579 | snprintf(buf, size, "%luMB", hsize >> 20); | |
580 | else | |
581 | snprintf(buf, size, "%luKB", hsize >> 10); | |
582 | return buf; | |
583 | } | |
584 | ||
faced7e0 GS |
585 | static int __hugetlb_events_show(struct seq_file *seq, bool local) |
586 | { | |
587 | int idx; | |
588 | long max; | |
589 | struct cftype *cft = seq_cft(seq); | |
590 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq)); | |
591 | ||
592 | idx = MEMFILE_IDX(cft->private); | |
593 | ||
594 | if (local) | |
595 | max = atomic_long_read(&h_cg->events_local[idx][HUGETLB_MAX]); | |
596 | else | |
597 | max = atomic_long_read(&h_cg->events[idx][HUGETLB_MAX]); | |
598 | ||
599 | seq_printf(seq, "max %lu\n", max); | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | static int hugetlb_events_show(struct seq_file *seq, void *v) | |
605 | { | |
606 | return __hugetlb_events_show(seq, false); | |
607 | } | |
608 | ||
609 | static int hugetlb_events_local_show(struct seq_file *seq, void *v) | |
610 | { | |
611 | return __hugetlb_events_show(seq, true); | |
612 | } | |
613 | ||
614 | static void __init __hugetlb_cgroup_file_dfl_init(int idx) | |
abb8206c AK |
615 | { |
616 | char buf[32]; | |
617 | struct cftype *cft; | |
618 | struct hstate *h = &hstates[idx]; | |
619 | ||
620 | /* format the size */ | |
cdc2fcfe | 621 | mem_fmt(buf, sizeof(buf), huge_page_size(h)); |
abb8206c AK |
622 | |
623 | /* Add the limit file */ | |
faced7e0 GS |
624 | cft = &h->cgroup_files_dfl[0]; |
625 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max", buf); | |
626 | cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT); | |
627 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
628 | cft->write = hugetlb_cgroup_write_dfl; | |
629 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
630 | ||
cdc2fcfe | 631 | /* Add the reservation limit file */ |
faced7e0 | 632 | cft = &h->cgroup_files_dfl[1]; |
cdc2fcfe MA |
633 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.max", buf); |
634 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_LIMIT); | |
635 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
636 | cft->write = hugetlb_cgroup_write_dfl; | |
637 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
638 | ||
639 | /* Add the current usage file */ | |
640 | cft = &h->cgroup_files_dfl[2]; | |
faced7e0 GS |
641 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.current", buf); |
642 | cft->private = MEMFILE_PRIVATE(idx, RES_USAGE); | |
643 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
644 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
645 | ||
cdc2fcfe MA |
646 | /* Add the current reservation usage file */ |
647 | cft = &h->cgroup_files_dfl[3]; | |
648 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.current", buf); | |
649 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_USAGE); | |
650 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
651 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
652 | ||
faced7e0 | 653 | /* Add the events file */ |
cdc2fcfe | 654 | cft = &h->cgroup_files_dfl[4]; |
faced7e0 GS |
655 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events", buf); |
656 | cft->private = MEMFILE_PRIVATE(idx, 0); | |
657 | cft->seq_show = hugetlb_events_show; | |
658 | cft->file_offset = offsetof(struct hugetlb_cgroup, events_file[idx]), | |
659 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
660 | ||
661 | /* Add the events.local file */ | |
cdc2fcfe | 662 | cft = &h->cgroup_files_dfl[5]; |
faced7e0 GS |
663 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events.local", buf); |
664 | cft->private = MEMFILE_PRIVATE(idx, 0); | |
665 | cft->seq_show = hugetlb_events_local_show; | |
666 | cft->file_offset = offsetof(struct hugetlb_cgroup, | |
667 | events_local_file[idx]), | |
668 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
669 | ||
670 | /* NULL terminate the last cft */ | |
cdc2fcfe | 671 | cft = &h->cgroup_files_dfl[6]; |
faced7e0 GS |
672 | memset(cft, 0, sizeof(*cft)); |
673 | ||
674 | WARN_ON(cgroup_add_dfl_cftypes(&hugetlb_cgrp_subsys, | |
675 | h->cgroup_files_dfl)); | |
676 | } | |
677 | ||
678 | static void __init __hugetlb_cgroup_file_legacy_init(int idx) | |
679 | { | |
680 | char buf[32]; | |
681 | struct cftype *cft; | |
682 | struct hstate *h = &hstates[idx]; | |
683 | ||
684 | /* format the size */ | |
cdc2fcfe | 685 | mem_fmt(buf, sizeof(buf), huge_page_size(h)); |
faced7e0 GS |
686 | |
687 | /* Add the limit file */ | |
688 | cft = &h->cgroup_files_legacy[0]; | |
abb8206c AK |
689 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf); |
690 | cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT); | |
716f479d | 691 | cft->read_u64 = hugetlb_cgroup_read_u64; |
faced7e0 | 692 | cft->write = hugetlb_cgroup_write_legacy; |
abb8206c | 693 | |
cdc2fcfe | 694 | /* Add the reservation limit file */ |
faced7e0 | 695 | cft = &h->cgroup_files_legacy[1]; |
cdc2fcfe MA |
696 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.limit_in_bytes", buf); |
697 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_LIMIT); | |
698 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
699 | cft->write = hugetlb_cgroup_write_legacy; | |
700 | ||
701 | /* Add the usage file */ | |
702 | cft = &h->cgroup_files_legacy[2]; | |
abb8206c AK |
703 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf); |
704 | cft->private = MEMFILE_PRIVATE(idx, RES_USAGE); | |
716f479d | 705 | cft->read_u64 = hugetlb_cgroup_read_u64; |
abb8206c | 706 | |
cdc2fcfe MA |
707 | /* Add the reservation usage file */ |
708 | cft = &h->cgroup_files_legacy[3]; | |
709 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.usage_in_bytes", buf); | |
710 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_USAGE); | |
711 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
712 | ||
abb8206c | 713 | /* Add the MAX usage file */ |
cdc2fcfe | 714 | cft = &h->cgroup_files_legacy[4]; |
abb8206c AK |
715 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf); |
716 | cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE); | |
6770c64e | 717 | cft->write = hugetlb_cgroup_reset; |
716f479d | 718 | cft->read_u64 = hugetlb_cgroup_read_u64; |
abb8206c | 719 | |
cdc2fcfe MA |
720 | /* Add the MAX reservation usage file */ |
721 | cft = &h->cgroup_files_legacy[5]; | |
722 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.max_usage_in_bytes", buf); | |
723 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_MAX_USAGE); | |
724 | cft->write = hugetlb_cgroup_reset; | |
725 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
726 | ||
abb8206c | 727 | /* Add the failcntfile */ |
cdc2fcfe | 728 | cft = &h->cgroup_files_legacy[6]; |
abb8206c | 729 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf); |
cdc2fcfe MA |
730 | cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT); |
731 | cft->write = hugetlb_cgroup_reset; | |
732 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
733 | ||
734 | /* Add the reservation failcntfile */ | |
735 | cft = &h->cgroup_files_legacy[7]; | |
736 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.failcnt", buf); | |
737 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_FAILCNT); | |
6770c64e | 738 | cft->write = hugetlb_cgroup_reset; |
716f479d | 739 | cft->read_u64 = hugetlb_cgroup_read_u64; |
abb8206c AK |
740 | |
741 | /* NULL terminate the last cft */ | |
cdc2fcfe | 742 | cft = &h->cgroup_files_legacy[8]; |
abb8206c AK |
743 | memset(cft, 0, sizeof(*cft)); |
744 | ||
2cf669a5 | 745 | WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys, |
faced7e0 GS |
746 | h->cgroup_files_legacy)); |
747 | } | |
748 | ||
749 | static void __init __hugetlb_cgroup_file_init(int idx) | |
750 | { | |
751 | __hugetlb_cgroup_file_dfl_init(idx); | |
752 | __hugetlb_cgroup_file_legacy_init(idx); | |
7179e7bf JW |
753 | } |
754 | ||
755 | void __init hugetlb_cgroup_file_init(void) | |
756 | { | |
757 | struct hstate *h; | |
758 | ||
759 | for_each_hstate(h) { | |
760 | /* | |
761 | * Add cgroup control files only if the huge page consists | |
762 | * of more than two normal pages. This is because we use | |
1d798ca3 | 763 | * page[2].private for storing cgroup details. |
7179e7bf JW |
764 | */ |
765 | if (huge_page_order(h) >= HUGETLB_CGROUP_MIN_ORDER) | |
766 | __hugetlb_cgroup_file_init(hstate_index(h)); | |
767 | } | |
abb8206c AK |
768 | } |
769 | ||
75754681 AK |
770 | /* |
771 | * hugetlb_lock will make sure a parallel cgroup rmdir won't happen | |
772 | * when we migrate hugepages | |
773 | */ | |
8e6ac7fa AK |
774 | void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage) |
775 | { | |
776 | struct hugetlb_cgroup *h_cg; | |
1adc4d41 | 777 | struct hugetlb_cgroup *h_cg_rsvd; |
94ae8ba7 | 778 | struct hstate *h = page_hstate(oldhpage); |
8e6ac7fa AK |
779 | |
780 | if (hugetlb_cgroup_disabled()) | |
781 | return; | |
782 | ||
309381fe | 783 | VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage); |
8e6ac7fa AK |
784 | spin_lock(&hugetlb_lock); |
785 | h_cg = hugetlb_cgroup_from_page(oldhpage); | |
1adc4d41 | 786 | h_cg_rsvd = hugetlb_cgroup_from_page_rsvd(oldhpage); |
8e6ac7fa | 787 | set_hugetlb_cgroup(oldhpage, NULL); |
9808895e | 788 | set_hugetlb_cgroup_rsvd(oldhpage, NULL); |
8e6ac7fa AK |
789 | |
790 | /* move the h_cg details to new cgroup */ | |
9808895e | 791 | set_hugetlb_cgroup(newhpage, h_cg); |
1adc4d41 | 792 | set_hugetlb_cgroup_rsvd(newhpage, h_cg_rsvd); |
94ae8ba7 | 793 | list_move(&newhpage->lru, &h->hugepage_activelist); |
8e6ac7fa | 794 | spin_unlock(&hugetlb_lock); |
8e6ac7fa AK |
795 | return; |
796 | } | |
797 | ||
faced7e0 GS |
798 | static struct cftype hugetlb_files[] = { |
799 | {} /* terminate */ | |
800 | }; | |
801 | ||
073219e9 | 802 | struct cgroup_subsys hugetlb_cgrp_subsys = { |
92fb9748 TH |
803 | .css_alloc = hugetlb_cgroup_css_alloc, |
804 | .css_offline = hugetlb_cgroup_css_offline, | |
805 | .css_free = hugetlb_cgroup_css_free, | |
faced7e0 GS |
806 | .dfl_cftypes = hugetlb_files, |
807 | .legacy_cftypes = hugetlb_files, | |
2bc64a20 | 808 | }; |