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1 | /* | |
2 | * | |
3 | * Copyright IBM Corporation, 2012 | |
4 | * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | |
5 | * | |
6 | * Cgroup v2 | |
7 | * Copyright (C) 2019 Red Hat, Inc. | |
8 | * Author: Giuseppe Scrivano <gscrivan@redhat.com> | |
9 | * | |
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> | |
21 | #include <linux/page_counter.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/hugetlb.h> | |
24 | #include <linux/hugetlb_cgroup.h> | |
25 | ||
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 | ||
30 | static struct hugetlb_cgroup *root_h_cgroup __read_mostly; | |
31 | ||
32 | static inline struct page_counter * | |
33 | __hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx, | |
34 | bool rsvd) | |
35 | { | |
36 | if (rsvd) | |
37 | return &h_cg->rsvd_hugepage[idx]; | |
38 | return &h_cg->hugepage[idx]; | |
39 | } | |
40 | ||
41 | static inline struct page_counter * | |
42 | hugetlb_cgroup_counter_from_cgroup(struct hugetlb_cgroup *h_cg, int idx) | |
43 | { | |
44 | return __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, false); | |
45 | } | |
46 | ||
47 | static inline struct page_counter * | |
48 | hugetlb_cgroup_counter_from_cgroup_rsvd(struct hugetlb_cgroup *h_cg, int idx) | |
49 | { | |
50 | return __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, true); | |
51 | } | |
52 | ||
53 | static inline | |
54 | struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s) | |
55 | { | |
56 | return s ? container_of(s, struct hugetlb_cgroup, css) : NULL; | |
57 | } | |
58 | ||
59 | static inline | |
60 | struct hugetlb_cgroup *hugetlb_cgroup_from_task(struct task_struct *task) | |
61 | { | |
62 | return hugetlb_cgroup_from_css(task_css(task, hugetlb_cgrp_id)); | |
63 | } | |
64 | ||
65 | static inline bool hugetlb_cgroup_is_root(struct hugetlb_cgroup *h_cg) | |
66 | { | |
67 | return (h_cg == root_h_cgroup); | |
68 | } | |
69 | ||
70 | static inline struct hugetlb_cgroup * | |
71 | parent_hugetlb_cgroup(struct hugetlb_cgroup *h_cg) | |
72 | { | |
73 | return hugetlb_cgroup_from_css(h_cg->css.parent); | |
74 | } | |
75 | ||
76 | static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg) | |
77 | { | |
78 | struct hstate *h; | |
79 | ||
80 | for_each_hstate(h) { | |
81 | if (page_counter_read( | |
82 | hugetlb_cgroup_counter_from_cgroup(h_cg, hstate_index(h)))) | |
83 | return true; | |
84 | } | |
85 | return false; | |
86 | } | |
87 | ||
88 | static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup, | |
89 | struct hugetlb_cgroup *parent_h_cgroup) | |
90 | { | |
91 | int idx; | |
92 | ||
93 | for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) { | |
94 | struct page_counter *fault_parent = NULL; | |
95 | struct page_counter *rsvd_parent = NULL; | |
96 | unsigned long limit; | |
97 | int ret; | |
98 | ||
99 | if (parent_h_cgroup) { | |
100 | fault_parent = hugetlb_cgroup_counter_from_cgroup( | |
101 | parent_h_cgroup, idx); | |
102 | rsvd_parent = hugetlb_cgroup_counter_from_cgroup_rsvd( | |
103 | parent_h_cgroup, idx); | |
104 | } | |
105 | page_counter_init(hugetlb_cgroup_counter_from_cgroup(h_cgroup, | |
106 | idx), | |
107 | fault_parent); | |
108 | page_counter_init( | |
109 | hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx), | |
110 | rsvd_parent); | |
111 | ||
112 | limit = round_down(PAGE_COUNTER_MAX, | |
113 | pages_per_huge_page(&hstates[idx])); | |
114 | ||
115 | ret = page_counter_set_max( | |
116 | hugetlb_cgroup_counter_from_cgroup(h_cgroup, idx), | |
117 | limit); | |
118 | VM_BUG_ON(ret); | |
119 | ret = page_counter_set_max( | |
120 | hugetlb_cgroup_counter_from_cgroup_rsvd(h_cgroup, idx), | |
121 | limit); | |
122 | VM_BUG_ON(ret); | |
123 | } | |
124 | } | |
125 | ||
126 | static void hugetlb_cgroup_free(struct hugetlb_cgroup *h_cgroup) | |
127 | { | |
128 | int node; | |
129 | ||
130 | for_each_node(node) | |
131 | kfree(h_cgroup->nodeinfo[node]); | |
132 | kfree(h_cgroup); | |
133 | } | |
134 | ||
135 | static struct cgroup_subsys_state * | |
136 | hugetlb_cgroup_css_alloc(struct cgroup_subsys_state *parent_css) | |
137 | { | |
138 | struct hugetlb_cgroup *parent_h_cgroup = hugetlb_cgroup_from_css(parent_css); | |
139 | struct hugetlb_cgroup *h_cgroup; | |
140 | int node; | |
141 | ||
142 | h_cgroup = kzalloc(struct_size(h_cgroup, nodeinfo, nr_node_ids), | |
143 | GFP_KERNEL); | |
144 | ||
145 | if (!h_cgroup) | |
146 | return ERR_PTR(-ENOMEM); | |
147 | ||
148 | if (!parent_h_cgroup) | |
149 | root_h_cgroup = h_cgroup; | |
150 | ||
151 | /* | |
152 | * TODO: this routine can waste much memory for nodes which will | |
153 | * never be onlined. It's better to use memory hotplug callback | |
154 | * function. | |
155 | */ | |
156 | for_each_node(node) { | |
157 | /* Set node_to_alloc to NUMA_NO_NODE for offline nodes. */ | |
158 | int node_to_alloc = | |
159 | node_state(node, N_NORMAL_MEMORY) ? node : NUMA_NO_NODE; | |
160 | h_cgroup->nodeinfo[node] = | |
161 | kzalloc_node(sizeof(struct hugetlb_cgroup_per_node), | |
162 | GFP_KERNEL, node_to_alloc); | |
163 | if (!h_cgroup->nodeinfo[node]) | |
164 | goto fail_alloc_nodeinfo; | |
165 | } | |
166 | ||
167 | hugetlb_cgroup_init(h_cgroup, parent_h_cgroup); | |
168 | return &h_cgroup->css; | |
169 | ||
170 | fail_alloc_nodeinfo: | |
171 | hugetlb_cgroup_free(h_cgroup); | |
172 | return ERR_PTR(-ENOMEM); | |
173 | } | |
174 | ||
175 | static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css) | |
176 | { | |
177 | hugetlb_cgroup_free(hugetlb_cgroup_from_css(css)); | |
178 | } | |
179 | ||
180 | /* | |
181 | * Should be called with hugetlb_lock held. | |
182 | * Since we are holding hugetlb_lock, pages cannot get moved from | |
183 | * active list or uncharged from the cgroup, So no need to get | |
184 | * page reference and test for page active here. This function | |
185 | * cannot fail. | |
186 | */ | |
187 | static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg, | |
188 | struct page *page) | |
189 | { | |
190 | unsigned int nr_pages; | |
191 | struct page_counter *counter; | |
192 | struct hugetlb_cgroup *page_hcg; | |
193 | struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg); | |
194 | struct folio *folio = page_folio(page); | |
195 | ||
196 | page_hcg = hugetlb_cgroup_from_folio(folio); | |
197 | /* | |
198 | * We can have pages in active list without any cgroup | |
199 | * ie, hugepage with less than 3 pages. We can safely | |
200 | * ignore those pages. | |
201 | */ | |
202 | if (!page_hcg || page_hcg != h_cg) | |
203 | goto out; | |
204 | ||
205 | nr_pages = compound_nr(page); | |
206 | if (!parent) { | |
207 | parent = root_h_cgroup; | |
208 | /* root has no limit */ | |
209 | page_counter_charge(&parent->hugepage[idx], nr_pages); | |
210 | } | |
211 | counter = &h_cg->hugepage[idx]; | |
212 | /* Take the pages off the local counter */ | |
213 | page_counter_cancel(counter, nr_pages); | |
214 | ||
215 | set_hugetlb_cgroup(folio, parent); | |
216 | out: | |
217 | return; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Force the hugetlb cgroup to empty the hugetlb resources by moving them to | |
222 | * the parent cgroup. | |
223 | */ | |
224 | static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css) | |
225 | { | |
226 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css); | |
227 | struct hstate *h; | |
228 | struct page *page; | |
229 | ||
230 | do { | |
231 | for_each_hstate(h) { | |
232 | spin_lock_irq(&hugetlb_lock); | |
233 | list_for_each_entry(page, &h->hugepage_activelist, lru) | |
234 | hugetlb_cgroup_move_parent(hstate_index(h), h_cg, page); | |
235 | ||
236 | spin_unlock_irq(&hugetlb_lock); | |
237 | } | |
238 | cond_resched(); | |
239 | } while (hugetlb_cgroup_have_usage(h_cg)); | |
240 | } | |
241 | ||
242 | static inline void hugetlb_event(struct hugetlb_cgroup *hugetlb, int idx, | |
243 | enum hugetlb_memory_event event) | |
244 | { | |
245 | atomic_long_inc(&hugetlb->events_local[idx][event]); | |
246 | cgroup_file_notify(&hugetlb->events_local_file[idx]); | |
247 | ||
248 | do { | |
249 | atomic_long_inc(&hugetlb->events[idx][event]); | |
250 | cgroup_file_notify(&hugetlb->events_file[idx]); | |
251 | } while ((hugetlb = parent_hugetlb_cgroup(hugetlb)) && | |
252 | !hugetlb_cgroup_is_root(hugetlb)); | |
253 | } | |
254 | ||
255 | static int __hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, | |
256 | struct hugetlb_cgroup **ptr, | |
257 | bool rsvd) | |
258 | { | |
259 | int ret = 0; | |
260 | struct page_counter *counter; | |
261 | struct hugetlb_cgroup *h_cg = NULL; | |
262 | ||
263 | if (hugetlb_cgroup_disabled()) | |
264 | goto done; | |
265 | /* | |
266 | * We don't charge any cgroup if the compound page have less | |
267 | * than 3 pages. | |
268 | */ | |
269 | if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) | |
270 | goto done; | |
271 | again: | |
272 | rcu_read_lock(); | |
273 | h_cg = hugetlb_cgroup_from_task(current); | |
274 | if (!css_tryget(&h_cg->css)) { | |
275 | rcu_read_unlock(); | |
276 | goto again; | |
277 | } | |
278 | rcu_read_unlock(); | |
279 | ||
280 | if (!page_counter_try_charge( | |
281 | __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd), | |
282 | nr_pages, &counter)) { | |
283 | ret = -ENOMEM; | |
284 | hugetlb_event(h_cg, idx, HUGETLB_MAX); | |
285 | css_put(&h_cg->css); | |
286 | goto done; | |
287 | } | |
288 | /* Reservations take a reference to the css because they do not get | |
289 | * reparented. | |
290 | */ | |
291 | if (!rsvd) | |
292 | css_put(&h_cg->css); | |
293 | done: | |
294 | *ptr = h_cg; | |
295 | return ret; | |
296 | } | |
297 | ||
298 | int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, | |
299 | struct hugetlb_cgroup **ptr) | |
300 | { | |
301 | return __hugetlb_cgroup_charge_cgroup(idx, nr_pages, ptr, false); | |
302 | } | |
303 | ||
304 | int hugetlb_cgroup_charge_cgroup_rsvd(int idx, unsigned long nr_pages, | |
305 | struct hugetlb_cgroup **ptr) | |
306 | { | |
307 | return __hugetlb_cgroup_charge_cgroup(idx, nr_pages, ptr, true); | |
308 | } | |
309 | ||
310 | /* Should be called with hugetlb_lock held */ | |
311 | static void __hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, | |
312 | struct hugetlb_cgroup *h_cg, | |
313 | struct folio *folio, bool rsvd) | |
314 | { | |
315 | if (hugetlb_cgroup_disabled() || !h_cg) | |
316 | return; | |
317 | ||
318 | __set_hugetlb_cgroup(folio, h_cg, rsvd); | |
319 | if (!rsvd) { | |
320 | unsigned long usage = | |
321 | h_cg->nodeinfo[folio_nid(folio)]->usage[idx]; | |
322 | /* | |
323 | * This write is not atomic due to fetching usage and writing | |
324 | * to it, but that's fine because we call this with | |
325 | * hugetlb_lock held anyway. | |
326 | */ | |
327 | WRITE_ONCE(h_cg->nodeinfo[folio_nid(folio)]->usage[idx], | |
328 | usage + nr_pages); | |
329 | } | |
330 | } | |
331 | ||
332 | void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, | |
333 | struct hugetlb_cgroup *h_cg, | |
334 | struct folio *folio) | |
335 | { | |
336 | __hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, folio, false); | |
337 | } | |
338 | ||
339 | void hugetlb_cgroup_commit_charge_rsvd(int idx, unsigned long nr_pages, | |
340 | struct hugetlb_cgroup *h_cg, | |
341 | struct folio *folio) | |
342 | { | |
343 | __hugetlb_cgroup_commit_charge(idx, nr_pages, h_cg, folio, true); | |
344 | } | |
345 | ||
346 | /* | |
347 | * Should be called with hugetlb_lock held | |
348 | */ | |
349 | static void __hugetlb_cgroup_uncharge_folio(int idx, unsigned long nr_pages, | |
350 | struct folio *folio, bool rsvd) | |
351 | { | |
352 | struct hugetlb_cgroup *h_cg; | |
353 | ||
354 | if (hugetlb_cgroup_disabled()) | |
355 | return; | |
356 | lockdep_assert_held(&hugetlb_lock); | |
357 | h_cg = __hugetlb_cgroup_from_folio(folio, rsvd); | |
358 | if (unlikely(!h_cg)) | |
359 | return; | |
360 | __set_hugetlb_cgroup(folio, NULL, rsvd); | |
361 | ||
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 | else { | |
369 | unsigned long usage = | |
370 | h_cg->nodeinfo[folio_nid(folio)]->usage[idx]; | |
371 | /* | |
372 | * This write is not atomic due to fetching usage and writing | |
373 | * to it, but that's fine because we call this with | |
374 | * hugetlb_lock held anyway. | |
375 | */ | |
376 | WRITE_ONCE(h_cg->nodeinfo[folio_nid(folio)]->usage[idx], | |
377 | usage - nr_pages); | |
378 | } | |
379 | } | |
380 | ||
381 | void hugetlb_cgroup_uncharge_folio(int idx, unsigned long nr_pages, | |
382 | struct folio *folio) | |
383 | { | |
384 | __hugetlb_cgroup_uncharge_folio(idx, nr_pages, folio, false); | |
385 | } | |
386 | ||
387 | void hugetlb_cgroup_uncharge_folio_rsvd(int idx, unsigned long nr_pages, | |
388 | struct folio *folio) | |
389 | { | |
390 | __hugetlb_cgroup_uncharge_folio(idx, nr_pages, folio, true); | |
391 | } | |
392 | ||
393 | static void __hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, | |
394 | struct hugetlb_cgroup *h_cg, | |
395 | bool rsvd) | |
396 | { | |
397 | if (hugetlb_cgroup_disabled() || !h_cg) | |
398 | return; | |
399 | ||
400 | if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) | |
401 | return; | |
402 | ||
403 | page_counter_uncharge(__hugetlb_cgroup_counter_from_cgroup(h_cg, idx, | |
404 | rsvd), | |
405 | nr_pages); | |
406 | ||
407 | if (rsvd) | |
408 | css_put(&h_cg->css); | |
409 | } | |
410 | ||
411 | void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, | |
412 | struct hugetlb_cgroup *h_cg) | |
413 | { | |
414 | __hugetlb_cgroup_uncharge_cgroup(idx, nr_pages, h_cg, false); | |
415 | } | |
416 | ||
417 | void hugetlb_cgroup_uncharge_cgroup_rsvd(int idx, unsigned long nr_pages, | |
418 | struct hugetlb_cgroup *h_cg) | |
419 | { | |
420 | __hugetlb_cgroup_uncharge_cgroup(idx, nr_pages, h_cg, true); | |
421 | } | |
422 | ||
423 | void hugetlb_cgroup_uncharge_counter(struct resv_map *resv, unsigned long start, | |
424 | unsigned long end) | |
425 | { | |
426 | if (hugetlb_cgroup_disabled() || !resv || !resv->reservation_counter || | |
427 | !resv->css) | |
428 | return; | |
429 | ||
430 | page_counter_uncharge(resv->reservation_counter, | |
431 | (end - start) * resv->pages_per_hpage); | |
432 | css_put(resv->css); | |
433 | } | |
434 | ||
435 | void hugetlb_cgroup_uncharge_file_region(struct resv_map *resv, | |
436 | struct file_region *rg, | |
437 | unsigned long nr_pages, | |
438 | bool region_del) | |
439 | { | |
440 | if (hugetlb_cgroup_disabled() || !resv || !rg || !nr_pages) | |
441 | return; | |
442 | ||
443 | if (rg->reservation_counter && resv->pages_per_hpage && | |
444 | !resv->reservation_counter) { | |
445 | page_counter_uncharge(rg->reservation_counter, | |
446 | nr_pages * resv->pages_per_hpage); | |
447 | /* | |
448 | * Only do css_put(rg->css) when we delete the entire region | |
449 | * because one file_region must hold exactly one css reference. | |
450 | */ | |
451 | if (region_del) | |
452 | css_put(rg->css); | |
453 | } | |
454 | } | |
455 | ||
456 | enum { | |
457 | RES_USAGE, | |
458 | RES_RSVD_USAGE, | |
459 | RES_LIMIT, | |
460 | RES_RSVD_LIMIT, | |
461 | RES_MAX_USAGE, | |
462 | RES_RSVD_MAX_USAGE, | |
463 | RES_FAILCNT, | |
464 | RES_RSVD_FAILCNT, | |
465 | }; | |
466 | ||
467 | static int hugetlb_cgroup_read_numa_stat(struct seq_file *seq, void *dummy) | |
468 | { | |
469 | int nid; | |
470 | struct cftype *cft = seq_cft(seq); | |
471 | int idx = MEMFILE_IDX(cft->private); | |
472 | bool legacy = MEMFILE_ATTR(cft->private); | |
473 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq)); | |
474 | struct cgroup_subsys_state *css; | |
475 | unsigned long usage; | |
476 | ||
477 | if (legacy) { | |
478 | /* Add up usage across all nodes for the non-hierarchical total. */ | |
479 | usage = 0; | |
480 | for_each_node_state(nid, N_MEMORY) | |
481 | usage += READ_ONCE(h_cg->nodeinfo[nid]->usage[idx]); | |
482 | seq_printf(seq, "total=%lu", usage * PAGE_SIZE); | |
483 | ||
484 | /* Simply print the per-node usage for the non-hierarchical total. */ | |
485 | for_each_node_state(nid, N_MEMORY) | |
486 | seq_printf(seq, " N%d=%lu", nid, | |
487 | READ_ONCE(h_cg->nodeinfo[nid]->usage[idx]) * | |
488 | PAGE_SIZE); | |
489 | seq_putc(seq, '\n'); | |
490 | } | |
491 | ||
492 | /* | |
493 | * The hierarchical total is pretty much the value recorded by the | |
494 | * counter, so use that. | |
495 | */ | |
496 | seq_printf(seq, "%stotal=%lu", legacy ? "hierarchical_" : "", | |
497 | page_counter_read(&h_cg->hugepage[idx]) * PAGE_SIZE); | |
498 | ||
499 | /* | |
500 | * For each node, transverse the css tree to obtain the hierarchical | |
501 | * node usage. | |
502 | */ | |
503 | for_each_node_state(nid, N_MEMORY) { | |
504 | usage = 0; | |
505 | rcu_read_lock(); | |
506 | css_for_each_descendant_pre(css, &h_cg->css) { | |
507 | usage += READ_ONCE(hugetlb_cgroup_from_css(css) | |
508 | ->nodeinfo[nid] | |
509 | ->usage[idx]); | |
510 | } | |
511 | rcu_read_unlock(); | |
512 | seq_printf(seq, " N%d=%lu", nid, usage * PAGE_SIZE); | |
513 | } | |
514 | ||
515 | seq_putc(seq, '\n'); | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css, | |
521 | struct cftype *cft) | |
522 | { | |
523 | struct page_counter *counter; | |
524 | struct page_counter *rsvd_counter; | |
525 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css); | |
526 | ||
527 | counter = &h_cg->hugepage[MEMFILE_IDX(cft->private)]; | |
528 | rsvd_counter = &h_cg->rsvd_hugepage[MEMFILE_IDX(cft->private)]; | |
529 | ||
530 | switch (MEMFILE_ATTR(cft->private)) { | |
531 | case RES_USAGE: | |
532 | return (u64)page_counter_read(counter) * PAGE_SIZE; | |
533 | case RES_RSVD_USAGE: | |
534 | return (u64)page_counter_read(rsvd_counter) * PAGE_SIZE; | |
535 | case RES_LIMIT: | |
536 | return (u64)counter->max * PAGE_SIZE; | |
537 | case RES_RSVD_LIMIT: | |
538 | return (u64)rsvd_counter->max * PAGE_SIZE; | |
539 | case RES_MAX_USAGE: | |
540 | return (u64)counter->watermark * PAGE_SIZE; | |
541 | case RES_RSVD_MAX_USAGE: | |
542 | return (u64)rsvd_counter->watermark * PAGE_SIZE; | |
543 | case RES_FAILCNT: | |
544 | return counter->failcnt; | |
545 | case RES_RSVD_FAILCNT: | |
546 | return rsvd_counter->failcnt; | |
547 | default: | |
548 | BUG(); | |
549 | } | |
550 | } | |
551 | ||
552 | static int hugetlb_cgroup_read_u64_max(struct seq_file *seq, void *v) | |
553 | { | |
554 | int idx; | |
555 | u64 val; | |
556 | struct cftype *cft = seq_cft(seq); | |
557 | unsigned long limit; | |
558 | struct page_counter *counter; | |
559 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq)); | |
560 | ||
561 | idx = MEMFILE_IDX(cft->private); | |
562 | counter = &h_cg->hugepage[idx]; | |
563 | ||
564 | limit = round_down(PAGE_COUNTER_MAX, | |
565 | pages_per_huge_page(&hstates[idx])); | |
566 | ||
567 | switch (MEMFILE_ATTR(cft->private)) { | |
568 | case RES_RSVD_USAGE: | |
569 | counter = &h_cg->rsvd_hugepage[idx]; | |
570 | fallthrough; | |
571 | case RES_USAGE: | |
572 | val = (u64)page_counter_read(counter); | |
573 | seq_printf(seq, "%llu\n", val * PAGE_SIZE); | |
574 | break; | |
575 | case RES_RSVD_LIMIT: | |
576 | counter = &h_cg->rsvd_hugepage[idx]; | |
577 | fallthrough; | |
578 | case RES_LIMIT: | |
579 | val = (u64)counter->max; | |
580 | if (val == limit) | |
581 | seq_puts(seq, "max\n"); | |
582 | else | |
583 | seq_printf(seq, "%llu\n", val * PAGE_SIZE); | |
584 | break; | |
585 | default: | |
586 | BUG(); | |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | static DEFINE_MUTEX(hugetlb_limit_mutex); | |
593 | ||
594 | static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of, | |
595 | char *buf, size_t nbytes, loff_t off, | |
596 | const char *max) | |
597 | { | |
598 | int ret, idx; | |
599 | unsigned long nr_pages; | |
600 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of)); | |
601 | bool rsvd = false; | |
602 | ||
603 | if (hugetlb_cgroup_is_root(h_cg)) /* Can't set limit on root */ | |
604 | return -EINVAL; | |
605 | ||
606 | buf = strstrip(buf); | |
607 | ret = page_counter_memparse(buf, max, &nr_pages); | |
608 | if (ret) | |
609 | return ret; | |
610 | ||
611 | idx = MEMFILE_IDX(of_cft(of)->private); | |
612 | nr_pages = round_down(nr_pages, pages_per_huge_page(&hstates[idx])); | |
613 | ||
614 | switch (MEMFILE_ATTR(of_cft(of)->private)) { | |
615 | case RES_RSVD_LIMIT: | |
616 | rsvd = true; | |
617 | fallthrough; | |
618 | case RES_LIMIT: | |
619 | mutex_lock(&hugetlb_limit_mutex); | |
620 | ret = page_counter_set_max( | |
621 | __hugetlb_cgroup_counter_from_cgroup(h_cg, idx, rsvd), | |
622 | nr_pages); | |
623 | mutex_unlock(&hugetlb_limit_mutex); | |
624 | break; | |
625 | default: | |
626 | ret = -EINVAL; | |
627 | break; | |
628 | } | |
629 | return ret ?: nbytes; | |
630 | } | |
631 | ||
632 | static ssize_t hugetlb_cgroup_write_legacy(struct kernfs_open_file *of, | |
633 | char *buf, size_t nbytes, loff_t off) | |
634 | { | |
635 | return hugetlb_cgroup_write(of, buf, nbytes, off, "-1"); | |
636 | } | |
637 | ||
638 | static ssize_t hugetlb_cgroup_write_dfl(struct kernfs_open_file *of, | |
639 | char *buf, size_t nbytes, loff_t off) | |
640 | { | |
641 | return hugetlb_cgroup_write(of, buf, nbytes, off, "max"); | |
642 | } | |
643 | ||
644 | static ssize_t hugetlb_cgroup_reset(struct kernfs_open_file *of, | |
645 | char *buf, size_t nbytes, loff_t off) | |
646 | { | |
647 | int ret = 0; | |
648 | struct page_counter *counter, *rsvd_counter; | |
649 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of)); | |
650 | ||
651 | counter = &h_cg->hugepage[MEMFILE_IDX(of_cft(of)->private)]; | |
652 | rsvd_counter = &h_cg->rsvd_hugepage[MEMFILE_IDX(of_cft(of)->private)]; | |
653 | ||
654 | switch (MEMFILE_ATTR(of_cft(of)->private)) { | |
655 | case RES_MAX_USAGE: | |
656 | page_counter_reset_watermark(counter); | |
657 | break; | |
658 | case RES_RSVD_MAX_USAGE: | |
659 | page_counter_reset_watermark(rsvd_counter); | |
660 | break; | |
661 | case RES_FAILCNT: | |
662 | counter->failcnt = 0; | |
663 | break; | |
664 | case RES_RSVD_FAILCNT: | |
665 | rsvd_counter->failcnt = 0; | |
666 | break; | |
667 | default: | |
668 | ret = -EINVAL; | |
669 | break; | |
670 | } | |
671 | return ret ?: nbytes; | |
672 | } | |
673 | ||
674 | static char *mem_fmt(char *buf, int size, unsigned long hsize) | |
675 | { | |
676 | if (hsize >= SZ_1G) | |
677 | snprintf(buf, size, "%luGB", hsize / SZ_1G); | |
678 | else if (hsize >= SZ_1M) | |
679 | snprintf(buf, size, "%luMB", hsize / SZ_1M); | |
680 | else | |
681 | snprintf(buf, size, "%luKB", hsize / SZ_1K); | |
682 | return buf; | |
683 | } | |
684 | ||
685 | static int __hugetlb_events_show(struct seq_file *seq, bool local) | |
686 | { | |
687 | int idx; | |
688 | long max; | |
689 | struct cftype *cft = seq_cft(seq); | |
690 | struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq)); | |
691 | ||
692 | idx = MEMFILE_IDX(cft->private); | |
693 | ||
694 | if (local) | |
695 | max = atomic_long_read(&h_cg->events_local[idx][HUGETLB_MAX]); | |
696 | else | |
697 | max = atomic_long_read(&h_cg->events[idx][HUGETLB_MAX]); | |
698 | ||
699 | seq_printf(seq, "max %lu\n", max); | |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
704 | static int hugetlb_events_show(struct seq_file *seq, void *v) | |
705 | { | |
706 | return __hugetlb_events_show(seq, false); | |
707 | } | |
708 | ||
709 | static int hugetlb_events_local_show(struct seq_file *seq, void *v) | |
710 | { | |
711 | return __hugetlb_events_show(seq, true); | |
712 | } | |
713 | ||
714 | static void __init __hugetlb_cgroup_file_dfl_init(int idx) | |
715 | { | |
716 | char buf[32]; | |
717 | struct cftype *cft; | |
718 | struct hstate *h = &hstates[idx]; | |
719 | ||
720 | /* format the size */ | |
721 | mem_fmt(buf, sizeof(buf), huge_page_size(h)); | |
722 | ||
723 | /* Add the limit file */ | |
724 | cft = &h->cgroup_files_dfl[0]; | |
725 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max", buf); | |
726 | cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT); | |
727 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
728 | cft->write = hugetlb_cgroup_write_dfl; | |
729 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
730 | ||
731 | /* Add the reservation limit file */ | |
732 | cft = &h->cgroup_files_dfl[1]; | |
733 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.max", buf); | |
734 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_LIMIT); | |
735 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
736 | cft->write = hugetlb_cgroup_write_dfl; | |
737 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
738 | ||
739 | /* Add the current usage file */ | |
740 | cft = &h->cgroup_files_dfl[2]; | |
741 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.current", buf); | |
742 | cft->private = MEMFILE_PRIVATE(idx, RES_USAGE); | |
743 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
744 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
745 | ||
746 | /* Add the current reservation usage file */ | |
747 | cft = &h->cgroup_files_dfl[3]; | |
748 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.current", buf); | |
749 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_USAGE); | |
750 | cft->seq_show = hugetlb_cgroup_read_u64_max; | |
751 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
752 | ||
753 | /* Add the events file */ | |
754 | cft = &h->cgroup_files_dfl[4]; | |
755 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events", buf); | |
756 | cft->private = MEMFILE_PRIVATE(idx, 0); | |
757 | cft->seq_show = hugetlb_events_show; | |
758 | cft->file_offset = offsetof(struct hugetlb_cgroup, events_file[idx]); | |
759 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
760 | ||
761 | /* Add the events.local file */ | |
762 | cft = &h->cgroup_files_dfl[5]; | |
763 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events.local", buf); | |
764 | cft->private = MEMFILE_PRIVATE(idx, 0); | |
765 | cft->seq_show = hugetlb_events_local_show; | |
766 | cft->file_offset = offsetof(struct hugetlb_cgroup, | |
767 | events_local_file[idx]); | |
768 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
769 | ||
770 | /* Add the numa stat file */ | |
771 | cft = &h->cgroup_files_dfl[6]; | |
772 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.numa_stat", buf); | |
773 | cft->private = MEMFILE_PRIVATE(idx, 0); | |
774 | cft->seq_show = hugetlb_cgroup_read_numa_stat; | |
775 | cft->flags = CFTYPE_NOT_ON_ROOT; | |
776 | ||
777 | /* NULL terminate the last cft */ | |
778 | cft = &h->cgroup_files_dfl[7]; | |
779 | memset(cft, 0, sizeof(*cft)); | |
780 | ||
781 | WARN_ON(cgroup_add_dfl_cftypes(&hugetlb_cgrp_subsys, | |
782 | h->cgroup_files_dfl)); | |
783 | } | |
784 | ||
785 | static void __init __hugetlb_cgroup_file_legacy_init(int idx) | |
786 | { | |
787 | char buf[32]; | |
788 | struct cftype *cft; | |
789 | struct hstate *h = &hstates[idx]; | |
790 | ||
791 | /* format the size */ | |
792 | mem_fmt(buf, sizeof(buf), huge_page_size(h)); | |
793 | ||
794 | /* Add the limit file */ | |
795 | cft = &h->cgroup_files_legacy[0]; | |
796 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf); | |
797 | cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT); | |
798 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
799 | cft->write = hugetlb_cgroup_write_legacy; | |
800 | ||
801 | /* Add the reservation limit file */ | |
802 | cft = &h->cgroup_files_legacy[1]; | |
803 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.limit_in_bytes", buf); | |
804 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_LIMIT); | |
805 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
806 | cft->write = hugetlb_cgroup_write_legacy; | |
807 | ||
808 | /* Add the usage file */ | |
809 | cft = &h->cgroup_files_legacy[2]; | |
810 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf); | |
811 | cft->private = MEMFILE_PRIVATE(idx, RES_USAGE); | |
812 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
813 | ||
814 | /* Add the reservation usage file */ | |
815 | cft = &h->cgroup_files_legacy[3]; | |
816 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.usage_in_bytes", buf); | |
817 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_USAGE); | |
818 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
819 | ||
820 | /* Add the MAX usage file */ | |
821 | cft = &h->cgroup_files_legacy[4]; | |
822 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf); | |
823 | cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE); | |
824 | cft->write = hugetlb_cgroup_reset; | |
825 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
826 | ||
827 | /* Add the MAX reservation usage file */ | |
828 | cft = &h->cgroup_files_legacy[5]; | |
829 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.max_usage_in_bytes", buf); | |
830 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_MAX_USAGE); | |
831 | cft->write = hugetlb_cgroup_reset; | |
832 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
833 | ||
834 | /* Add the failcntfile */ | |
835 | cft = &h->cgroup_files_legacy[6]; | |
836 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf); | |
837 | cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT); | |
838 | cft->write = hugetlb_cgroup_reset; | |
839 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
840 | ||
841 | /* Add the reservation failcntfile */ | |
842 | cft = &h->cgroup_files_legacy[7]; | |
843 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.rsvd.failcnt", buf); | |
844 | cft->private = MEMFILE_PRIVATE(idx, RES_RSVD_FAILCNT); | |
845 | cft->write = hugetlb_cgroup_reset; | |
846 | cft->read_u64 = hugetlb_cgroup_read_u64; | |
847 | ||
848 | /* Add the numa stat file */ | |
849 | cft = &h->cgroup_files_legacy[8]; | |
850 | snprintf(cft->name, MAX_CFTYPE_NAME, "%s.numa_stat", buf); | |
851 | cft->private = MEMFILE_PRIVATE(idx, 1); | |
852 | cft->seq_show = hugetlb_cgroup_read_numa_stat; | |
853 | ||
854 | /* NULL terminate the last cft */ | |
855 | cft = &h->cgroup_files_legacy[9]; | |
856 | memset(cft, 0, sizeof(*cft)); | |
857 | ||
858 | WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys, | |
859 | h->cgroup_files_legacy)); | |
860 | } | |
861 | ||
862 | static void __init __hugetlb_cgroup_file_init(int idx) | |
863 | { | |
864 | __hugetlb_cgroup_file_dfl_init(idx); | |
865 | __hugetlb_cgroup_file_legacy_init(idx); | |
866 | } | |
867 | ||
868 | void __init hugetlb_cgroup_file_init(void) | |
869 | { | |
870 | struct hstate *h; | |
871 | ||
872 | for_each_hstate(h) { | |
873 | /* | |
874 | * Add cgroup control files only if the huge page consists | |
875 | * of more than two normal pages. This is because we use | |
876 | * page[2].private for storing cgroup details. | |
877 | */ | |
878 | if (huge_page_order(h) >= HUGETLB_CGROUP_MIN_ORDER) | |
879 | __hugetlb_cgroup_file_init(hstate_index(h)); | |
880 | } | |
881 | } | |
882 | ||
883 | /* | |
884 | * hugetlb_lock will make sure a parallel cgroup rmdir won't happen | |
885 | * when we migrate hugepages | |
886 | */ | |
887 | void hugetlb_cgroup_migrate(struct folio *old_folio, struct folio *new_folio) | |
888 | { | |
889 | struct hugetlb_cgroup *h_cg; | |
890 | struct hugetlb_cgroup *h_cg_rsvd; | |
891 | struct hstate *h = folio_hstate(old_folio); | |
892 | ||
893 | if (hugetlb_cgroup_disabled()) | |
894 | return; | |
895 | ||
896 | spin_lock_irq(&hugetlb_lock); | |
897 | h_cg = hugetlb_cgroup_from_folio(old_folio); | |
898 | h_cg_rsvd = hugetlb_cgroup_from_folio_rsvd(old_folio); | |
899 | set_hugetlb_cgroup(old_folio, NULL); | |
900 | set_hugetlb_cgroup_rsvd(old_folio, NULL); | |
901 | ||
902 | /* move the h_cg details to new cgroup */ | |
903 | set_hugetlb_cgroup(new_folio, h_cg); | |
904 | set_hugetlb_cgroup_rsvd(new_folio, h_cg_rsvd); | |
905 | list_move(&new_folio->lru, &h->hugepage_activelist); | |
906 | spin_unlock_irq(&hugetlb_lock); | |
907 | return; | |
908 | } | |
909 | ||
910 | static struct cftype hugetlb_files[] = { | |
911 | {} /* terminate */ | |
912 | }; | |
913 | ||
914 | struct cgroup_subsys hugetlb_cgrp_subsys = { | |
915 | .css_alloc = hugetlb_cgroup_css_alloc, | |
916 | .css_offline = hugetlb_cgroup_css_offline, | |
917 | .css_free = hugetlb_cgroup_css_free, | |
918 | .dfl_cftypes = hugetlb_files, | |
919 | .legacy_cftypes = hugetlb_files, | |
920 | }; |