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Source at commit 6c17a31f1fc515425221067cb3ece599c09dbc5d created 12 years 8 months ago. By Werner Almesberger, atusb, atben: moved from spi/ to ieee802154/; renamed atusb to spi_atusb | |
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1 | /* |
2 | * Common Block IO controller cgroup interface |
3 | * |
4 | * Based on ideas and code from CFQ, CFS and BFQ: |
5 | * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> |
6 | * |
7 | * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it> |
8 | * Paolo Valente <paolo.valente@unimore.it> |
9 | * |
10 | * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com> |
11 | * Nauman Rafique <nauman@google.com> |
12 | */ |
13 | #include <linux/ioprio.h> |
14 | #include <linux/seq_file.h> |
15 | #include <linux/kdev_t.h> |
16 | #include <linux/module.h> |
17 | #include <linux/err.h> |
18 | #include <linux/blkdev.h> |
19 | #include <linux/slab.h> |
20 | #include "blk-cgroup.h" |
21 | #include <linux/genhd.h> |
22 | |
23 | #define MAX_KEY_LEN 100 |
24 | |
25 | static DEFINE_SPINLOCK(blkio_list_lock); |
26 | static LIST_HEAD(blkio_list); |
27 | |
28 | struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; |
29 | EXPORT_SYMBOL_GPL(blkio_root_cgroup); |
30 | |
31 | static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *, |
32 | struct cgroup *); |
33 | static int blkiocg_can_attach(struct cgroup_subsys *, struct cgroup *, |
34 | struct task_struct *, bool); |
35 | static void blkiocg_attach(struct cgroup_subsys *, struct cgroup *, |
36 | struct cgroup *, struct task_struct *, bool); |
37 | static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *); |
38 | static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *); |
39 | |
40 | /* for encoding cft->private value on file */ |
41 | #define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
42 | /* What policy owns the file, proportional or throttle */ |
43 | #define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff) |
44 | #define BLKIOFILE_ATTR(val) ((val) & 0xffff) |
45 | |
46 | struct cgroup_subsys blkio_subsys = { |
47 | .name = "blkio", |
48 | .create = blkiocg_create, |
49 | .can_attach = blkiocg_can_attach, |
50 | .attach = blkiocg_attach, |
51 | .destroy = blkiocg_destroy, |
52 | .populate = blkiocg_populate, |
53 | #ifdef CONFIG_BLK_CGROUP |
54 | /* note: blkio_subsys_id is otherwise defined in blk-cgroup.h */ |
55 | .subsys_id = blkio_subsys_id, |
56 | #endif |
57 | .use_id = 1, |
58 | .module = THIS_MODULE, |
59 | }; |
60 | EXPORT_SYMBOL_GPL(blkio_subsys); |
61 | |
62 | static inline void blkio_policy_insert_node(struct blkio_cgroup *blkcg, |
63 | struct blkio_policy_node *pn) |
64 | { |
65 | list_add(&pn->node, &blkcg->policy_list); |
66 | } |
67 | |
68 | static inline bool cftype_blkg_same_policy(struct cftype *cft, |
69 | struct blkio_group *blkg) |
70 | { |
71 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
72 | |
73 | if (blkg->plid == plid) |
74 | return 1; |
75 | |
76 | return 0; |
77 | } |
78 | |
79 | /* Determines if policy node matches cgroup file being accessed */ |
80 | static inline bool pn_matches_cftype(struct cftype *cft, |
81 | struct blkio_policy_node *pn) |
82 | { |
83 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
84 | int fileid = BLKIOFILE_ATTR(cft->private); |
85 | |
86 | return (plid == pn->plid && fileid == pn->fileid); |
87 | } |
88 | |
89 | /* Must be called with blkcg->lock held */ |
90 | static inline void blkio_policy_delete_node(struct blkio_policy_node *pn) |
91 | { |
92 | list_del(&pn->node); |
93 | } |
94 | |
95 | /* Must be called with blkcg->lock held */ |
96 | static struct blkio_policy_node * |
97 | blkio_policy_search_node(const struct blkio_cgroup *blkcg, dev_t dev, |
98 | enum blkio_policy_id plid, int fileid) |
99 | { |
100 | struct blkio_policy_node *pn; |
101 | |
102 | list_for_each_entry(pn, &blkcg->policy_list, node) { |
103 | if (pn->dev == dev && pn->plid == plid && pn->fileid == fileid) |
104 | return pn; |
105 | } |
106 | |
107 | return NULL; |
108 | } |
109 | |
110 | struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) |
111 | { |
112 | return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), |
113 | struct blkio_cgroup, css); |
114 | } |
115 | EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup); |
116 | |
117 | static inline void |
118 | blkio_update_group_weight(struct blkio_group *blkg, unsigned int weight) |
119 | { |
120 | struct blkio_policy_type *blkiop; |
121 | |
122 | list_for_each_entry(blkiop, &blkio_list, list) { |
123 | /* If this policy does not own the blkg, do not send updates */ |
124 | if (blkiop->plid != blkg->plid) |
125 | continue; |
126 | if (blkiop->ops.blkio_update_group_weight_fn) |
127 | blkiop->ops.blkio_update_group_weight_fn(blkg->key, |
128 | blkg, weight); |
129 | } |
130 | } |
131 | |
132 | static inline void blkio_update_group_bps(struct blkio_group *blkg, u64 bps, |
133 | int fileid) |
134 | { |
135 | struct blkio_policy_type *blkiop; |
136 | |
137 | list_for_each_entry(blkiop, &blkio_list, list) { |
138 | |
139 | /* If this policy does not own the blkg, do not send updates */ |
140 | if (blkiop->plid != blkg->plid) |
141 | continue; |
142 | |
143 | if (fileid == BLKIO_THROTL_read_bps_device |
144 | && blkiop->ops.blkio_update_group_read_bps_fn) |
145 | blkiop->ops.blkio_update_group_read_bps_fn(blkg->key, |
146 | blkg, bps); |
147 | |
148 | if (fileid == BLKIO_THROTL_write_bps_device |
149 | && blkiop->ops.blkio_update_group_write_bps_fn) |
150 | blkiop->ops.blkio_update_group_write_bps_fn(blkg->key, |
151 | blkg, bps); |
152 | } |
153 | } |
154 | |
155 | static inline void blkio_update_group_iops(struct blkio_group *blkg, |
156 | unsigned int iops, int fileid) |
157 | { |
158 | struct blkio_policy_type *blkiop; |
159 | |
160 | list_for_each_entry(blkiop, &blkio_list, list) { |
161 | |
162 | /* If this policy does not own the blkg, do not send updates */ |
163 | if (blkiop->plid != blkg->plid) |
164 | continue; |
165 | |
166 | if (fileid == BLKIO_THROTL_read_iops_device |
167 | && blkiop->ops.blkio_update_group_read_iops_fn) |
168 | blkiop->ops.blkio_update_group_read_iops_fn(blkg->key, |
169 | blkg, iops); |
170 | |
171 | if (fileid == BLKIO_THROTL_write_iops_device |
172 | && blkiop->ops.blkio_update_group_write_iops_fn) |
173 | blkiop->ops.blkio_update_group_write_iops_fn(blkg->key, |
174 | blkg,iops); |
175 | } |
176 | } |
177 | |
178 | /* |
179 | * Add to the appropriate stat variable depending on the request type. |
180 | * This should be called with the blkg->stats_lock held. |
181 | */ |
182 | static void blkio_add_stat(uint64_t *stat, uint64_t add, bool direction, |
183 | bool sync) |
184 | { |
185 | if (direction) |
186 | stat[BLKIO_STAT_WRITE] += add; |
187 | else |
188 | stat[BLKIO_STAT_READ] += add; |
189 | if (sync) |
190 | stat[BLKIO_STAT_SYNC] += add; |
191 | else |
192 | stat[BLKIO_STAT_ASYNC] += add; |
193 | } |
194 | |
195 | /* |
196 | * Decrements the appropriate stat variable if non-zero depending on the |
197 | * request type. Panics on value being zero. |
198 | * This should be called with the blkg->stats_lock held. |
199 | */ |
200 | static void blkio_check_and_dec_stat(uint64_t *stat, bool direction, bool sync) |
201 | { |
202 | if (direction) { |
203 | BUG_ON(stat[BLKIO_STAT_WRITE] == 0); |
204 | stat[BLKIO_STAT_WRITE]--; |
205 | } else { |
206 | BUG_ON(stat[BLKIO_STAT_READ] == 0); |
207 | stat[BLKIO_STAT_READ]--; |
208 | } |
209 | if (sync) { |
210 | BUG_ON(stat[BLKIO_STAT_SYNC] == 0); |
211 | stat[BLKIO_STAT_SYNC]--; |
212 | } else { |
213 | BUG_ON(stat[BLKIO_STAT_ASYNC] == 0); |
214 | stat[BLKIO_STAT_ASYNC]--; |
215 | } |
216 | } |
217 | |
218 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
219 | /* This should be called with the blkg->stats_lock held. */ |
220 | static void blkio_set_start_group_wait_time(struct blkio_group *blkg, |
221 | struct blkio_group *curr_blkg) |
222 | { |
223 | if (blkio_blkg_waiting(&blkg->stats)) |
224 | return; |
225 | if (blkg == curr_blkg) |
226 | return; |
227 | blkg->stats.start_group_wait_time = sched_clock(); |
228 | blkio_mark_blkg_waiting(&blkg->stats); |
229 | } |
230 | |
231 | /* This should be called with the blkg->stats_lock held. */ |
232 | static void blkio_update_group_wait_time(struct blkio_group_stats *stats) |
233 | { |
234 | unsigned long long now; |
235 | |
236 | if (!blkio_blkg_waiting(stats)) |
237 | return; |
238 | |
239 | now = sched_clock(); |
240 | if (time_after64(now, stats->start_group_wait_time)) |
241 | stats->group_wait_time += now - stats->start_group_wait_time; |
242 | blkio_clear_blkg_waiting(stats); |
243 | } |
244 | |
245 | /* This should be called with the blkg->stats_lock held. */ |
246 | static void blkio_end_empty_time(struct blkio_group_stats *stats) |
247 | { |
248 | unsigned long long now; |
249 | |
250 | if (!blkio_blkg_empty(stats)) |
251 | return; |
252 | |
253 | now = sched_clock(); |
254 | if (time_after64(now, stats->start_empty_time)) |
255 | stats->empty_time += now - stats->start_empty_time; |
256 | blkio_clear_blkg_empty(stats); |
257 | } |
258 | |
259 | void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) |
260 | { |
261 | unsigned long flags; |
262 | |
263 | spin_lock_irqsave(&blkg->stats_lock, flags); |
264 | BUG_ON(blkio_blkg_idling(&blkg->stats)); |
265 | blkg->stats.start_idle_time = sched_clock(); |
266 | blkio_mark_blkg_idling(&blkg->stats); |
267 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
268 | } |
269 | EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats); |
270 | |
271 | void blkiocg_update_idle_time_stats(struct blkio_group *blkg) |
272 | { |
273 | unsigned long flags; |
274 | unsigned long long now; |
275 | struct blkio_group_stats *stats; |
276 | |
277 | spin_lock_irqsave(&blkg->stats_lock, flags); |
278 | stats = &blkg->stats; |
279 | if (blkio_blkg_idling(stats)) { |
280 | now = sched_clock(); |
281 | if (time_after64(now, stats->start_idle_time)) |
282 | stats->idle_time += now - stats->start_idle_time; |
283 | blkio_clear_blkg_idling(stats); |
284 | } |
285 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
286 | } |
287 | EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats); |
288 | |
289 | void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) |
290 | { |
291 | unsigned long flags; |
292 | struct blkio_group_stats *stats; |
293 | |
294 | spin_lock_irqsave(&blkg->stats_lock, flags); |
295 | stats = &blkg->stats; |
296 | stats->avg_queue_size_sum += |
297 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] + |
298 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]; |
299 | stats->avg_queue_size_samples++; |
300 | blkio_update_group_wait_time(stats); |
301 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
302 | } |
303 | EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats); |
304 | |
305 | void blkiocg_set_start_empty_time(struct blkio_group *blkg) |
306 | { |
307 | unsigned long flags; |
308 | struct blkio_group_stats *stats; |
309 | |
310 | spin_lock_irqsave(&blkg->stats_lock, flags); |
311 | stats = &blkg->stats; |
312 | |
313 | if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] || |
314 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) { |
315 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
316 | return; |
317 | } |
318 | |
319 | /* |
320 | * group is already marked empty. This can happen if cfqq got new |
321 | * request in parent group and moved to this group while being added |
322 | * to service tree. Just ignore the event and move on. |
323 | */ |
324 | if(blkio_blkg_empty(stats)) { |
325 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
326 | return; |
327 | } |
328 | |
329 | stats->start_empty_time = sched_clock(); |
330 | blkio_mark_blkg_empty(stats); |
331 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
332 | } |
333 | EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time); |
334 | |
335 | void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
336 | unsigned long dequeue) |
337 | { |
338 | blkg->stats.dequeue += dequeue; |
339 | } |
340 | EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats); |
341 | #else |
342 | static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg, |
343 | struct blkio_group *curr_blkg) {} |
344 | static inline void blkio_end_empty_time(struct blkio_group_stats *stats) {} |
345 | #endif |
346 | |
347 | void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
348 | struct blkio_group *curr_blkg, bool direction, |
349 | bool sync) |
350 | { |
351 | unsigned long flags; |
352 | |
353 | spin_lock_irqsave(&blkg->stats_lock, flags); |
354 | blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction, |
355 | sync); |
356 | blkio_end_empty_time(&blkg->stats); |
357 | blkio_set_start_group_wait_time(blkg, curr_blkg); |
358 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
359 | } |
360 | EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats); |
361 | |
362 | void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
363 | bool direction, bool sync) |
364 | { |
365 | unsigned long flags; |
366 | |
367 | spin_lock_irqsave(&blkg->stats_lock, flags); |
368 | blkio_check_and_dec_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], |
369 | direction, sync); |
370 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
371 | } |
372 | EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats); |
373 | |
374 | void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time) |
375 | { |
376 | unsigned long flags; |
377 | |
378 | spin_lock_irqsave(&blkg->stats_lock, flags); |
379 | blkg->stats.time += time; |
380 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
381 | } |
382 | EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used); |
383 | |
384 | void blkiocg_update_dispatch_stats(struct blkio_group *blkg, |
385 | uint64_t bytes, bool direction, bool sync) |
386 | { |
387 | struct blkio_group_stats *stats; |
388 | unsigned long flags; |
389 | |
390 | spin_lock_irqsave(&blkg->stats_lock, flags); |
391 | stats = &blkg->stats; |
392 | stats->sectors += bytes >> 9; |
393 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICED], 1, direction, |
394 | sync); |
395 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_BYTES], bytes, |
396 | direction, sync); |
397 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
398 | } |
399 | EXPORT_SYMBOL_GPL(blkiocg_update_dispatch_stats); |
400 | |
401 | void blkiocg_update_completion_stats(struct blkio_group *blkg, |
402 | uint64_t start_time, uint64_t io_start_time, bool direction, bool sync) |
403 | { |
404 | struct blkio_group_stats *stats; |
405 | unsigned long flags; |
406 | unsigned long long now = sched_clock(); |
407 | |
408 | spin_lock_irqsave(&blkg->stats_lock, flags); |
409 | stats = &blkg->stats; |
410 | if (time_after64(now, io_start_time)) |
411 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_TIME], |
412 | now - io_start_time, direction, sync); |
413 | if (time_after64(io_start_time, start_time)) |
414 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_WAIT_TIME], |
415 | io_start_time - start_time, direction, sync); |
416 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
417 | } |
418 | EXPORT_SYMBOL_GPL(blkiocg_update_completion_stats); |
419 | |
420 | void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction, |
421 | bool sync) |
422 | { |
423 | unsigned long flags; |
424 | |
425 | spin_lock_irqsave(&blkg->stats_lock, flags); |
426 | blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_MERGED], 1, direction, |
427 | sync); |
428 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
429 | } |
430 | EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats); |
431 | |
432 | void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
433 | struct blkio_group *blkg, void *key, dev_t dev, |
434 | enum blkio_policy_id plid) |
435 | { |
436 | unsigned long flags; |
437 | |
438 | spin_lock_irqsave(&blkcg->lock, flags); |
439 | spin_lock_init(&blkg->stats_lock); |
440 | rcu_assign_pointer(blkg->key, key); |
441 | blkg->blkcg_id = css_id(&blkcg->css); |
442 | hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list); |
443 | blkg->plid = plid; |
444 | spin_unlock_irqrestore(&blkcg->lock, flags); |
445 | /* Need to take css reference ? */ |
446 | cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path)); |
447 | blkg->dev = dev; |
448 | } |
449 | EXPORT_SYMBOL_GPL(blkiocg_add_blkio_group); |
450 | |
451 | static void __blkiocg_del_blkio_group(struct blkio_group *blkg) |
452 | { |
453 | hlist_del_init_rcu(&blkg->blkcg_node); |
454 | blkg->blkcg_id = 0; |
455 | } |
456 | |
457 | /* |
458 | * returns 0 if blkio_group was still on cgroup list. Otherwise returns 1 |
459 | * indicating that blk_group was unhashed by the time we got to it. |
460 | */ |
461 | int blkiocg_del_blkio_group(struct blkio_group *blkg) |
462 | { |
463 | struct blkio_cgroup *blkcg; |
464 | unsigned long flags; |
465 | struct cgroup_subsys_state *css; |
466 | int ret = 1; |
467 | |
468 | rcu_read_lock(); |
469 | css = css_lookup(&blkio_subsys, blkg->blkcg_id); |
470 | if (css) { |
471 | blkcg = container_of(css, struct blkio_cgroup, css); |
472 | spin_lock_irqsave(&blkcg->lock, flags); |
473 | if (!hlist_unhashed(&blkg->blkcg_node)) { |
474 | __blkiocg_del_blkio_group(blkg); |
475 | ret = 0; |
476 | } |
477 | spin_unlock_irqrestore(&blkcg->lock, flags); |
478 | } |
479 | |
480 | rcu_read_unlock(); |
481 | return ret; |
482 | } |
483 | EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group); |
484 | |
485 | /* called under rcu_read_lock(). */ |
486 | struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) |
487 | { |
488 | struct blkio_group *blkg; |
489 | struct hlist_node *n; |
490 | void *__key; |
491 | |
492 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { |
493 | __key = blkg->key; |
494 | if (__key == key) |
495 | return blkg; |
496 | } |
497 | |
498 | return NULL; |
499 | } |
500 | EXPORT_SYMBOL_GPL(blkiocg_lookup_group); |
501 | |
502 | static int |
503 | blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) |
504 | { |
505 | struct blkio_cgroup *blkcg; |
506 | struct blkio_group *blkg; |
507 | struct blkio_group_stats *stats; |
508 | struct hlist_node *n; |
509 | uint64_t queued[BLKIO_STAT_TOTAL]; |
510 | int i; |
511 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
512 | bool idling, waiting, empty; |
513 | unsigned long long now = sched_clock(); |
514 | #endif |
515 | |
516 | blkcg = cgroup_to_blkio_cgroup(cgroup); |
517 | spin_lock_irq(&blkcg->lock); |
518 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
519 | spin_lock(&blkg->stats_lock); |
520 | stats = &blkg->stats; |
521 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
522 | idling = blkio_blkg_idling(stats); |
523 | waiting = blkio_blkg_waiting(stats); |
524 | empty = blkio_blkg_empty(stats); |
525 | #endif |
526 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
527 | queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i]; |
528 | memset(stats, 0, sizeof(struct blkio_group_stats)); |
529 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
530 | stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i]; |
531 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
532 | if (idling) { |
533 | blkio_mark_blkg_idling(stats); |
534 | stats->start_idle_time = now; |
535 | } |
536 | if (waiting) { |
537 | blkio_mark_blkg_waiting(stats); |
538 | stats->start_group_wait_time = now; |
539 | } |
540 | if (empty) { |
541 | blkio_mark_blkg_empty(stats); |
542 | stats->start_empty_time = now; |
543 | } |
544 | #endif |
545 | spin_unlock(&blkg->stats_lock); |
546 | } |
547 | spin_unlock_irq(&blkcg->lock); |
548 | return 0; |
549 | } |
550 | |
551 | static void blkio_get_key_name(enum stat_sub_type type, dev_t dev, char *str, |
552 | int chars_left, bool diskname_only) |
553 | { |
554 | snprintf(str, chars_left, "%d:%d", MAJOR(dev), MINOR(dev)); |
555 | chars_left -= strlen(str); |
556 | if (chars_left <= 0) { |
557 | printk(KERN_WARNING |
558 | "Possibly incorrect cgroup stat display format"); |
559 | return; |
560 | } |
561 | if (diskname_only) |
562 | return; |
563 | switch (type) { |
564 | case BLKIO_STAT_READ: |
565 | strlcat(str, " Read", chars_left); |
566 | break; |
567 | case BLKIO_STAT_WRITE: |
568 | strlcat(str, " Write", chars_left); |
569 | break; |
570 | case BLKIO_STAT_SYNC: |
571 | strlcat(str, " Sync", chars_left); |
572 | break; |
573 | case BLKIO_STAT_ASYNC: |
574 | strlcat(str, " Async", chars_left); |
575 | break; |
576 | case BLKIO_STAT_TOTAL: |
577 | strlcat(str, " Total", chars_left); |
578 | break; |
579 | default: |
580 | strlcat(str, " Invalid", chars_left); |
581 | } |
582 | } |
583 | |
584 | static uint64_t blkio_fill_stat(char *str, int chars_left, uint64_t val, |
585 | struct cgroup_map_cb *cb, dev_t dev) |
586 | { |
587 | blkio_get_key_name(0, dev, str, chars_left, true); |
588 | cb->fill(cb, str, val); |
589 | return val; |
590 | } |
591 | |
592 | /* This should be called with blkg->stats_lock held */ |
593 | static uint64_t blkio_get_stat(struct blkio_group *blkg, |
594 | struct cgroup_map_cb *cb, dev_t dev, enum stat_type type) |
595 | { |
596 | uint64_t disk_total; |
597 | char key_str[MAX_KEY_LEN]; |
598 | enum stat_sub_type sub_type; |
599 | |
600 | if (type == BLKIO_STAT_TIME) |
601 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
602 | blkg->stats.time, cb, dev); |
603 | if (type == BLKIO_STAT_SECTORS) |
604 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
605 | blkg->stats.sectors, cb, dev); |
606 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
607 | if (type == BLKIO_STAT_AVG_QUEUE_SIZE) { |
608 | uint64_t sum = blkg->stats.avg_queue_size_sum; |
609 | uint64_t samples = blkg->stats.avg_queue_size_samples; |
610 | if (samples) |
611 | do_div(sum, samples); |
612 | else |
613 | sum = 0; |
614 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, sum, cb, dev); |
615 | } |
616 | if (type == BLKIO_STAT_GROUP_WAIT_TIME) |
617 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
618 | blkg->stats.group_wait_time, cb, dev); |
619 | if (type == BLKIO_STAT_IDLE_TIME) |
620 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
621 | blkg->stats.idle_time, cb, dev); |
622 | if (type == BLKIO_STAT_EMPTY_TIME) |
623 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
624 | blkg->stats.empty_time, cb, dev); |
625 | if (type == BLKIO_STAT_DEQUEUE) |
626 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
627 | blkg->stats.dequeue, cb, dev); |
628 | #endif |
629 | |
630 | for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; |
631 | sub_type++) { |
632 | blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false); |
633 | cb->fill(cb, key_str, blkg->stats.stat_arr[type][sub_type]); |
634 | } |
635 | disk_total = blkg->stats.stat_arr[type][BLKIO_STAT_READ] + |
636 | blkg->stats.stat_arr[type][BLKIO_STAT_WRITE]; |
637 | blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false); |
638 | cb->fill(cb, key_str, disk_total); |
639 | return disk_total; |
640 | } |
641 | |
642 | static int blkio_check_dev_num(dev_t dev) |
643 | { |
644 | int part = 0; |
645 | struct gendisk *disk; |
646 | |
647 | disk = get_gendisk(dev, &part); |
648 | if (!disk || part) |
649 | return -ENODEV; |
650 | |
651 | return 0; |
652 | } |
653 | |
654 | static int blkio_policy_parse_and_set(char *buf, |
655 | struct blkio_policy_node *newpn, enum blkio_policy_id plid, int fileid) |
656 | { |
657 | char *s[4], *p, *major_s = NULL, *minor_s = NULL; |
658 | int ret; |
659 | unsigned long major, minor, temp; |
660 | int i = 0; |
661 | dev_t dev; |
662 | u64 bps, iops; |
663 | |
664 | memset(s, 0, sizeof(s)); |
665 | |
666 | while ((p = strsep(&buf, " ")) != NULL) { |
667 | if (!*p) |
668 | continue; |
669 | |
670 | s[i++] = p; |
671 | |
672 | /* Prevent from inputing too many things */ |
673 | if (i == 3) |
674 | break; |
675 | } |
676 | |
677 | if (i != 2) |
678 | return -EINVAL; |
679 | |
680 | p = strsep(&s[0], ":"); |
681 | if (p != NULL) |
682 | major_s = p; |
683 | else |
684 | return -EINVAL; |
685 | |
686 | minor_s = s[0]; |
687 | if (!minor_s) |
688 | return -EINVAL; |
689 | |
690 | ret = strict_strtoul(major_s, 10, &major); |
691 | if (ret) |
692 | return -EINVAL; |
693 | |
694 | ret = strict_strtoul(minor_s, 10, &minor); |
695 | if (ret) |
696 | return -EINVAL; |
697 | |
698 | dev = MKDEV(major, minor); |
699 | |
700 | ret = blkio_check_dev_num(dev); |
701 | if (ret) |
702 | return ret; |
703 | |
704 | newpn->dev = dev; |
705 | |
706 | if (s[1] == NULL) |
707 | return -EINVAL; |
708 | |
709 | switch (plid) { |
710 | case BLKIO_POLICY_PROP: |
711 | ret = strict_strtoul(s[1], 10, &temp); |
712 | if (ret || (temp < BLKIO_WEIGHT_MIN && temp > 0) || |
713 | temp > BLKIO_WEIGHT_MAX) |
714 | return -EINVAL; |
715 | |
716 | newpn->plid = plid; |
717 | newpn->fileid = fileid; |
718 | newpn->val.weight = temp; |
719 | break; |
720 | case BLKIO_POLICY_THROTL: |
721 | switch(fileid) { |
722 | case BLKIO_THROTL_read_bps_device: |
723 | case BLKIO_THROTL_write_bps_device: |
724 | ret = strict_strtoull(s[1], 10, &bps); |
725 | if (ret) |
726 | return -EINVAL; |
727 | |
728 | newpn->plid = plid; |
729 | newpn->fileid = fileid; |
730 | newpn->val.bps = bps; |
731 | break; |
732 | case BLKIO_THROTL_read_iops_device: |
733 | case BLKIO_THROTL_write_iops_device: |
734 | ret = strict_strtoull(s[1], 10, &iops); |
735 | if (ret) |
736 | return -EINVAL; |
737 | |
738 | if (iops > THROTL_IOPS_MAX) |
739 | return -EINVAL; |
740 | |
741 | newpn->plid = plid; |
742 | newpn->fileid = fileid; |
743 | newpn->val.iops = (unsigned int)iops; |
744 | break; |
745 | } |
746 | break; |
747 | default: |
748 | BUG(); |
749 | } |
750 | |
751 | return 0; |
752 | } |
753 | |
754 | unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg, |
755 | dev_t dev) |
756 | { |
757 | struct blkio_policy_node *pn; |
758 | |
759 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_PROP, |
760 | BLKIO_PROP_weight_device); |
761 | if (pn) |
762 | return pn->val.weight; |
763 | else |
764 | return blkcg->weight; |
765 | } |
766 | EXPORT_SYMBOL_GPL(blkcg_get_weight); |
767 | |
768 | uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, dev_t dev) |
769 | { |
770 | struct blkio_policy_node *pn; |
771 | |
772 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
773 | BLKIO_THROTL_read_bps_device); |
774 | if (pn) |
775 | return pn->val.bps; |
776 | else |
777 | return -1; |
778 | } |
779 | |
780 | uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, dev_t dev) |
781 | { |
782 | struct blkio_policy_node *pn; |
783 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
784 | BLKIO_THROTL_write_bps_device); |
785 | if (pn) |
786 | return pn->val.bps; |
787 | else |
788 | return -1; |
789 | } |
790 | |
791 | unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg, dev_t dev) |
792 | { |
793 | struct blkio_policy_node *pn; |
794 | |
795 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
796 | BLKIO_THROTL_read_iops_device); |
797 | if (pn) |
798 | return pn->val.iops; |
799 | else |
800 | return -1; |
801 | } |
802 | |
803 | unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg, dev_t dev) |
804 | { |
805 | struct blkio_policy_node *pn; |
806 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
807 | BLKIO_THROTL_write_iops_device); |
808 | if (pn) |
809 | return pn->val.iops; |
810 | else |
811 | return -1; |
812 | } |
813 | |
814 | /* Checks whether user asked for deleting a policy rule */ |
815 | static bool blkio_delete_rule_command(struct blkio_policy_node *pn) |
816 | { |
817 | switch(pn->plid) { |
818 | case BLKIO_POLICY_PROP: |
819 | if (pn->val.weight == 0) |
820 | return 1; |
821 | break; |
822 | case BLKIO_POLICY_THROTL: |
823 | switch(pn->fileid) { |
824 | case BLKIO_THROTL_read_bps_device: |
825 | case BLKIO_THROTL_write_bps_device: |
826 | if (pn->val.bps == 0) |
827 | return 1; |
828 | break; |
829 | case BLKIO_THROTL_read_iops_device: |
830 | case BLKIO_THROTL_write_iops_device: |
831 | if (pn->val.iops == 0) |
832 | return 1; |
833 | } |
834 | break; |
835 | default: |
836 | BUG(); |
837 | } |
838 | |
839 | return 0; |
840 | } |
841 | |
842 | static void blkio_update_policy_rule(struct blkio_policy_node *oldpn, |
843 | struct blkio_policy_node *newpn) |
844 | { |
845 | switch(oldpn->plid) { |
846 | case BLKIO_POLICY_PROP: |
847 | oldpn->val.weight = newpn->val.weight; |
848 | break; |
849 | case BLKIO_POLICY_THROTL: |
850 | switch(newpn->fileid) { |
851 | case BLKIO_THROTL_read_bps_device: |
852 | case BLKIO_THROTL_write_bps_device: |
853 | oldpn->val.bps = newpn->val.bps; |
854 | break; |
855 | case BLKIO_THROTL_read_iops_device: |
856 | case BLKIO_THROTL_write_iops_device: |
857 | oldpn->val.iops = newpn->val.iops; |
858 | } |
859 | break; |
860 | default: |
861 | BUG(); |
862 | } |
863 | } |
864 | |
865 | /* |
866 | * Some rules/values in blkg have changed. Propogate those to respective |
867 | * policies. |
868 | */ |
869 | static void blkio_update_blkg_policy(struct blkio_cgroup *blkcg, |
870 | struct blkio_group *blkg, struct blkio_policy_node *pn) |
871 | { |
872 | unsigned int weight, iops; |
873 | u64 bps; |
874 | |
875 | switch(pn->plid) { |
876 | case BLKIO_POLICY_PROP: |
877 | weight = pn->val.weight ? pn->val.weight : |
878 | blkcg->weight; |
879 | blkio_update_group_weight(blkg, weight); |
880 | break; |
881 | case BLKIO_POLICY_THROTL: |
882 | switch(pn->fileid) { |
883 | case BLKIO_THROTL_read_bps_device: |
884 | case BLKIO_THROTL_write_bps_device: |
885 | bps = pn->val.bps ? pn->val.bps : (-1); |
886 | blkio_update_group_bps(blkg, bps, pn->fileid); |
887 | break; |
888 | case BLKIO_THROTL_read_iops_device: |
889 | case BLKIO_THROTL_write_iops_device: |
890 | iops = pn->val.iops ? pn->val.iops : (-1); |
891 | blkio_update_group_iops(blkg, iops, pn->fileid); |
892 | break; |
893 | } |
894 | break; |
895 | default: |
896 | BUG(); |
897 | } |
898 | } |
899 | |
900 | /* |
901 | * A policy node rule has been updated. Propogate this update to all the |
902 | * block groups which might be affected by this update. |
903 | */ |
904 | static void blkio_update_policy_node_blkg(struct blkio_cgroup *blkcg, |
905 | struct blkio_policy_node *pn) |
906 | { |
907 | struct blkio_group *blkg; |
908 | struct hlist_node *n; |
909 | |
910 | spin_lock(&blkio_list_lock); |
911 | spin_lock_irq(&blkcg->lock); |
912 | |
913 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
914 | if (pn->dev != blkg->dev || pn->plid != blkg->plid) |
915 | continue; |
916 | blkio_update_blkg_policy(blkcg, blkg, pn); |
917 | } |
918 | |
919 | spin_unlock_irq(&blkcg->lock); |
920 | spin_unlock(&blkio_list_lock); |
921 | } |
922 | |
923 | static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft, |
924 | const char *buffer) |
925 | { |
926 | int ret = 0; |
927 | char *buf; |
928 | struct blkio_policy_node *newpn, *pn; |
929 | struct blkio_cgroup *blkcg; |
930 | int keep_newpn = 0; |
931 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
932 | int fileid = BLKIOFILE_ATTR(cft->private); |
933 | |
934 | buf = kstrdup(buffer, GFP_KERNEL); |
935 | if (!buf) |
936 | return -ENOMEM; |
937 | |
938 | newpn = kzalloc(sizeof(*newpn), GFP_KERNEL); |
939 | if (!newpn) { |
940 | ret = -ENOMEM; |
941 | goto free_buf; |
942 | } |
943 | |
944 | ret = blkio_policy_parse_and_set(buf, newpn, plid, fileid); |
945 | if (ret) |
946 | goto free_newpn; |
947 | |
948 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
949 | |
950 | spin_lock_irq(&blkcg->lock); |
951 | |
952 | pn = blkio_policy_search_node(blkcg, newpn->dev, plid, fileid); |
953 | if (!pn) { |
954 | if (!blkio_delete_rule_command(newpn)) { |
955 | blkio_policy_insert_node(blkcg, newpn); |
956 | keep_newpn = 1; |
957 | } |
958 | spin_unlock_irq(&blkcg->lock); |
959 | goto update_io_group; |
960 | } |
961 | |
962 | if (blkio_delete_rule_command(newpn)) { |
963 | blkio_policy_delete_node(pn); |
964 | spin_unlock_irq(&blkcg->lock); |
965 | goto update_io_group; |
966 | } |
967 | spin_unlock_irq(&blkcg->lock); |
968 | |
969 | blkio_update_policy_rule(pn, newpn); |
970 | |
971 | update_io_group: |
972 | blkio_update_policy_node_blkg(blkcg, newpn); |
973 | |
974 | free_newpn: |
975 | if (!keep_newpn) |
976 | kfree(newpn); |
977 | free_buf: |
978 | kfree(buf); |
979 | return ret; |
980 | } |
981 | |
982 | static void |
983 | blkio_print_policy_node(struct seq_file *m, struct blkio_policy_node *pn) |
984 | { |
985 | switch(pn->plid) { |
986 | case BLKIO_POLICY_PROP: |
987 | if (pn->fileid == BLKIO_PROP_weight_device) |
988 | seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev), |
989 | MINOR(pn->dev), pn->val.weight); |
990 | break; |
991 | case BLKIO_POLICY_THROTL: |
992 | switch(pn->fileid) { |
993 | case BLKIO_THROTL_read_bps_device: |
994 | case BLKIO_THROTL_write_bps_device: |
995 | seq_printf(m, "%u:%u\t%llu\n", MAJOR(pn->dev), |
996 | MINOR(pn->dev), pn->val.bps); |
997 | break; |
998 | case BLKIO_THROTL_read_iops_device: |
999 | case BLKIO_THROTL_write_iops_device: |
1000 | seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev), |
1001 | MINOR(pn->dev), pn->val.iops); |
1002 | break; |
1003 | } |
1004 | break; |
1005 | default: |
1006 | BUG(); |
1007 | } |
1008 | } |
1009 | |
1010 | /* cgroup files which read their data from policy nodes end up here */ |
1011 | static void blkio_read_policy_node_files(struct cftype *cft, |
1012 | struct blkio_cgroup *blkcg, struct seq_file *m) |
1013 | { |
1014 | struct blkio_policy_node *pn; |
1015 | |
1016 | if (!list_empty(&blkcg->policy_list)) { |
1017 | spin_lock_irq(&blkcg->lock); |
1018 | list_for_each_entry(pn, &blkcg->policy_list, node) { |
1019 | if (!pn_matches_cftype(cft, pn)) |
1020 | continue; |
1021 | blkio_print_policy_node(m, pn); |
1022 | } |
1023 | spin_unlock_irq(&blkcg->lock); |
1024 | } |
1025 | } |
1026 | |
1027 | static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft, |
1028 | struct seq_file *m) |
1029 | { |
1030 | struct blkio_cgroup *blkcg; |
1031 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1032 | int name = BLKIOFILE_ATTR(cft->private); |
1033 | |
1034 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1035 | |
1036 | switch(plid) { |
1037 | case BLKIO_POLICY_PROP: |
1038 | switch(name) { |
1039 | case BLKIO_PROP_weight_device: |
1040 | blkio_read_policy_node_files(cft, blkcg, m); |
1041 | return 0; |
1042 | default: |
1043 | BUG(); |
1044 | } |
1045 | break; |
1046 | case BLKIO_POLICY_THROTL: |
1047 | switch(name){ |
1048 | case BLKIO_THROTL_read_bps_device: |
1049 | case BLKIO_THROTL_write_bps_device: |
1050 | case BLKIO_THROTL_read_iops_device: |
1051 | case BLKIO_THROTL_write_iops_device: |
1052 | blkio_read_policy_node_files(cft, blkcg, m); |
1053 | return 0; |
1054 | default: |
1055 | BUG(); |
1056 | } |
1057 | break; |
1058 | default: |
1059 | BUG(); |
1060 | } |
1061 | |
1062 | return 0; |
1063 | } |
1064 | |
1065 | static int blkio_read_blkg_stats(struct blkio_cgroup *blkcg, |
1066 | struct cftype *cft, struct cgroup_map_cb *cb, enum stat_type type, |
1067 | bool show_total) |
1068 | { |
1069 | struct blkio_group *blkg; |
1070 | struct hlist_node *n; |
1071 | uint64_t cgroup_total = 0; |
1072 | |
1073 | rcu_read_lock(); |
1074 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { |
1075 | if (blkg->dev) { |
1076 | if (!cftype_blkg_same_policy(cft, blkg)) |
1077 | continue; |
1078 | spin_lock_irq(&blkg->stats_lock); |
1079 | cgroup_total += blkio_get_stat(blkg, cb, blkg->dev, |
1080 | type); |
1081 | spin_unlock_irq(&blkg->stats_lock); |
1082 | } |
1083 | } |
1084 | if (show_total) |
1085 | cb->fill(cb, "Total", cgroup_total); |
1086 | rcu_read_unlock(); |
1087 | return 0; |
1088 | } |
1089 | |
1090 | /* All map kind of cgroup file get serviced by this function */ |
1091 | static int blkiocg_file_read_map(struct cgroup *cgrp, struct cftype *cft, |
1092 | struct cgroup_map_cb *cb) |
1093 | { |
1094 | struct blkio_cgroup *blkcg; |
1095 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1096 | int name = BLKIOFILE_ATTR(cft->private); |
1097 | |
1098 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1099 | |
1100 | switch(plid) { |
1101 | case BLKIO_POLICY_PROP: |
1102 | switch(name) { |
1103 | case BLKIO_PROP_time: |
1104 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1105 | BLKIO_STAT_TIME, 0); |
1106 | case BLKIO_PROP_sectors: |
1107 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1108 | BLKIO_STAT_SECTORS, 0); |
1109 | case BLKIO_PROP_io_service_bytes: |
1110 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1111 | BLKIO_STAT_SERVICE_BYTES, 1); |
1112 | case BLKIO_PROP_io_serviced: |
1113 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1114 | BLKIO_STAT_SERVICED, 1); |
1115 | case BLKIO_PROP_io_service_time: |
1116 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1117 | BLKIO_STAT_SERVICE_TIME, 1); |
1118 | case BLKIO_PROP_io_wait_time: |
1119 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1120 | BLKIO_STAT_WAIT_TIME, 1); |
1121 | case BLKIO_PROP_io_merged: |
1122 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1123 | BLKIO_STAT_MERGED, 1); |
1124 | case BLKIO_PROP_io_queued: |
1125 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1126 | BLKIO_STAT_QUEUED, 1); |
1127 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
1128 | case BLKIO_PROP_dequeue: |
1129 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1130 | BLKIO_STAT_DEQUEUE, 0); |
1131 | case BLKIO_PROP_avg_queue_size: |
1132 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1133 | BLKIO_STAT_AVG_QUEUE_SIZE, 0); |
1134 | case BLKIO_PROP_group_wait_time: |
1135 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1136 | BLKIO_STAT_GROUP_WAIT_TIME, 0); |
1137 | case BLKIO_PROP_idle_time: |
1138 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1139 | BLKIO_STAT_IDLE_TIME, 0); |
1140 | case BLKIO_PROP_empty_time: |
1141 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1142 | BLKIO_STAT_EMPTY_TIME, 0); |
1143 | #endif |
1144 | default: |
1145 | BUG(); |
1146 | } |
1147 | break; |
1148 | case BLKIO_POLICY_THROTL: |
1149 | switch(name){ |
1150 | case BLKIO_THROTL_io_service_bytes: |
1151 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1152 | BLKIO_STAT_SERVICE_BYTES, 1); |
1153 | case BLKIO_THROTL_io_serviced: |
1154 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1155 | BLKIO_STAT_SERVICED, 1); |
1156 | default: |
1157 | BUG(); |
1158 | } |
1159 | break; |
1160 | default: |
1161 | BUG(); |
1162 | } |
1163 | |
1164 | return 0; |
1165 | } |
1166 | |
1167 | static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val) |
1168 | { |
1169 | struct blkio_group *blkg; |
1170 | struct hlist_node *n; |
1171 | struct blkio_policy_node *pn; |
1172 | |
1173 | if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX) |
1174 | return -EINVAL; |
1175 | |
1176 | spin_lock(&blkio_list_lock); |
1177 | spin_lock_irq(&blkcg->lock); |
1178 | blkcg->weight = (unsigned int)val; |
1179 | |
1180 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
1181 | pn = blkio_policy_search_node(blkcg, blkg->dev, |
1182 | BLKIO_POLICY_PROP, BLKIO_PROP_weight_device); |
1183 | if (pn) |
1184 | continue; |
1185 | |
1186 | blkio_update_group_weight(blkg, blkcg->weight); |
1187 | } |
1188 | spin_unlock_irq(&blkcg->lock); |
1189 | spin_unlock(&blkio_list_lock); |
1190 | return 0; |
1191 | } |
1192 | |
1193 | static u64 blkiocg_file_read_u64 (struct cgroup *cgrp, struct cftype *cft) { |
1194 | struct blkio_cgroup *blkcg; |
1195 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1196 | int name = BLKIOFILE_ATTR(cft->private); |
1197 | |
1198 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1199 | |
1200 | switch(plid) { |
1201 | case BLKIO_POLICY_PROP: |
1202 | switch(name) { |
1203 | case BLKIO_PROP_weight: |
1204 | return (u64)blkcg->weight; |
1205 | } |
1206 | break; |
1207 | default: |
1208 | BUG(); |
1209 | } |
1210 | return 0; |
1211 | } |
1212 | |
1213 | static int |
1214 | blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val) |
1215 | { |
1216 | struct blkio_cgroup *blkcg; |
1217 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1218 | int name = BLKIOFILE_ATTR(cft->private); |
1219 | |
1220 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1221 | |
1222 | switch(plid) { |
1223 | case BLKIO_POLICY_PROP: |
1224 | switch(name) { |
1225 | case BLKIO_PROP_weight: |
1226 | return blkio_weight_write(blkcg, val); |
1227 | } |
1228 | break; |
1229 | default: |
1230 | BUG(); |
1231 | } |
1232 | |
1233 | return 0; |
1234 | } |
1235 | |
1236 | struct cftype blkio_files[] = { |
1237 | { |
1238 | .name = "weight_device", |
1239 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1240 | BLKIO_PROP_weight_device), |
1241 | .read_seq_string = blkiocg_file_read, |
1242 | .write_string = blkiocg_file_write, |
1243 | .max_write_len = 256, |
1244 | }, |
1245 | { |
1246 | .name = "weight", |
1247 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1248 | BLKIO_PROP_weight), |
1249 | .read_u64 = blkiocg_file_read_u64, |
1250 | .write_u64 = blkiocg_file_write_u64, |
1251 | }, |
1252 | { |
1253 | .name = "time", |
1254 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1255 | BLKIO_PROP_time), |
1256 | .read_map = blkiocg_file_read_map, |
1257 | }, |
1258 | { |
1259 | .name = "sectors", |
1260 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1261 | BLKIO_PROP_sectors), |
1262 | .read_map = blkiocg_file_read_map, |
1263 | }, |
1264 | { |
1265 | .name = "io_service_bytes", |
1266 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1267 | BLKIO_PROP_io_service_bytes), |
1268 | .read_map = blkiocg_file_read_map, |
1269 | }, |
1270 | { |
1271 | .name = "io_serviced", |
1272 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1273 | BLKIO_PROP_io_serviced), |
1274 | .read_map = blkiocg_file_read_map, |
1275 | }, |
1276 | { |
1277 | .name = "io_service_time", |
1278 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1279 | BLKIO_PROP_io_service_time), |
1280 | .read_map = blkiocg_file_read_map, |
1281 | }, |
1282 | { |
1283 | .name = "io_wait_time", |
1284 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1285 | BLKIO_PROP_io_wait_time), |
1286 | .read_map = blkiocg_file_read_map, |
1287 | }, |
1288 | { |
1289 | .name = "io_merged", |
1290 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1291 | BLKIO_PROP_io_merged), |
1292 | .read_map = blkiocg_file_read_map, |
1293 | }, |
1294 | { |
1295 | .name = "io_queued", |
1296 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1297 | BLKIO_PROP_io_queued), |
1298 | .read_map = blkiocg_file_read_map, |
1299 | }, |
1300 | { |
1301 | .name = "reset_stats", |
1302 | .write_u64 = blkiocg_reset_stats, |
1303 | }, |
1304 | #ifdef CONFIG_BLK_DEV_THROTTLING |
1305 | { |
1306 | .name = "throttle.read_bps_device", |
1307 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1308 | BLKIO_THROTL_read_bps_device), |
1309 | .read_seq_string = blkiocg_file_read, |
1310 | .write_string = blkiocg_file_write, |
1311 | .max_write_len = 256, |
1312 | }, |
1313 | |
1314 | { |
1315 | .name = "throttle.write_bps_device", |
1316 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1317 | BLKIO_THROTL_write_bps_device), |
1318 | .read_seq_string = blkiocg_file_read, |
1319 | .write_string = blkiocg_file_write, |
1320 | .max_write_len = 256, |
1321 | }, |
1322 | |
1323 | { |
1324 | .name = "throttle.read_iops_device", |
1325 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1326 | BLKIO_THROTL_read_iops_device), |
1327 | .read_seq_string = blkiocg_file_read, |
1328 | .write_string = blkiocg_file_write, |
1329 | .max_write_len = 256, |
1330 | }, |
1331 | |
1332 | { |
1333 | .name = "throttle.write_iops_device", |
1334 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1335 | BLKIO_THROTL_write_iops_device), |
1336 | .read_seq_string = blkiocg_file_read, |
1337 | .write_string = blkiocg_file_write, |
1338 | .max_write_len = 256, |
1339 | }, |
1340 | { |
1341 | .name = "throttle.io_service_bytes", |
1342 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1343 | BLKIO_THROTL_io_service_bytes), |
1344 | .read_map = blkiocg_file_read_map, |
1345 | }, |
1346 | { |
1347 | .name = "throttle.io_serviced", |
1348 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1349 | BLKIO_THROTL_io_serviced), |
1350 | .read_map = blkiocg_file_read_map, |
1351 | }, |
1352 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
1353 | |
1354 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
1355 | { |
1356 | .name = "avg_queue_size", |
1357 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1358 | BLKIO_PROP_avg_queue_size), |
1359 | .read_map = blkiocg_file_read_map, |
1360 | }, |
1361 | { |
1362 | .name = "group_wait_time", |
1363 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1364 | BLKIO_PROP_group_wait_time), |
1365 | .read_map = blkiocg_file_read_map, |
1366 | }, |
1367 | { |
1368 | .name = "idle_time", |
1369 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1370 | BLKIO_PROP_idle_time), |
1371 | .read_map = blkiocg_file_read_map, |
1372 | }, |
1373 | { |
1374 | .name = "empty_time", |
1375 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1376 | BLKIO_PROP_empty_time), |
1377 | .read_map = blkiocg_file_read_map, |
1378 | }, |
1379 | { |
1380 | .name = "dequeue", |
1381 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1382 | BLKIO_PROP_dequeue), |
1383 | .read_map = blkiocg_file_read_map, |
1384 | }, |
1385 | #endif |
1386 | }; |
1387 | |
1388 | static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
1389 | { |
1390 | return cgroup_add_files(cgroup, subsys, blkio_files, |
1391 | ARRAY_SIZE(blkio_files)); |
1392 | } |
1393 | |
1394 | static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
1395 | { |
1396 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); |
1397 | unsigned long flags; |
1398 | struct blkio_group *blkg; |
1399 | void *key; |
1400 | struct blkio_policy_type *blkiop; |
1401 | struct blkio_policy_node *pn, *pntmp; |
1402 | |
1403 | rcu_read_lock(); |
1404 | do { |
1405 | spin_lock_irqsave(&blkcg->lock, flags); |
1406 | |
1407 | if (hlist_empty(&blkcg->blkg_list)) { |
1408 | spin_unlock_irqrestore(&blkcg->lock, flags); |
1409 | break; |
1410 | } |
1411 | |
1412 | blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group, |
1413 | blkcg_node); |
1414 | key = rcu_dereference(blkg->key); |
1415 | __blkiocg_del_blkio_group(blkg); |
1416 | |
1417 | spin_unlock_irqrestore(&blkcg->lock, flags); |
1418 | |
1419 | /* |
1420 | * This blkio_group is being unlinked as associated cgroup is |
1421 | * going away. Let all the IO controlling policies know about |
1422 | * this event. |
1423 | */ |
1424 | spin_lock(&blkio_list_lock); |
1425 | list_for_each_entry(blkiop, &blkio_list, list) { |
1426 | if (blkiop->plid != blkg->plid) |
1427 | continue; |
1428 | blkiop->ops.blkio_unlink_group_fn(key, blkg); |
1429 | } |
1430 | spin_unlock(&blkio_list_lock); |
1431 | } while (1); |
1432 | |
1433 | list_for_each_entry_safe(pn, pntmp, &blkcg->policy_list, node) { |
1434 | blkio_policy_delete_node(pn); |
1435 | kfree(pn); |
1436 | } |
1437 | |
1438 | free_css_id(&blkio_subsys, &blkcg->css); |
1439 | rcu_read_unlock(); |
1440 | if (blkcg != &blkio_root_cgroup) |
1441 | kfree(blkcg); |
1442 | } |
1443 | |
1444 | static struct cgroup_subsys_state * |
1445 | blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
1446 | { |
1447 | struct blkio_cgroup *blkcg; |
1448 | struct cgroup *parent = cgroup->parent; |
1449 | |
1450 | if (!parent) { |
1451 | blkcg = &blkio_root_cgroup; |
1452 | goto done; |
1453 | } |
1454 | |
1455 | blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL); |
1456 | if (!blkcg) |
1457 | return ERR_PTR(-ENOMEM); |
1458 | |
1459 | blkcg->weight = BLKIO_WEIGHT_DEFAULT; |
1460 | done: |
1461 | spin_lock_init(&blkcg->lock); |
1462 | INIT_HLIST_HEAD(&blkcg->blkg_list); |
1463 | |
1464 | INIT_LIST_HEAD(&blkcg->policy_list); |
1465 | return &blkcg->css; |
1466 | } |
1467 | |
1468 | /* |
1469 | * We cannot support shared io contexts, as we have no mean to support |
1470 | * two tasks with the same ioc in two different groups without major rework |
1471 | * of the main cic data structures. For now we allow a task to change |
1472 | * its cgroup only if it's the only owner of its ioc. |
1473 | */ |
1474 | static int blkiocg_can_attach(struct cgroup_subsys *subsys, |
1475 | struct cgroup *cgroup, struct task_struct *tsk, |
1476 | bool threadgroup) |
1477 | { |
1478 | struct io_context *ioc; |
1479 | int ret = 0; |
1480 | |
1481 | /* task_lock() is needed to avoid races with exit_io_context() */ |
1482 | task_lock(tsk); |
1483 | ioc = tsk->io_context; |
1484 | if (ioc && atomic_read(&ioc->nr_tasks) > 1) |
1485 | ret = -EINVAL; |
1486 | task_unlock(tsk); |
1487 | |
1488 | return ret; |
1489 | } |
1490 | |
1491 | static void blkiocg_attach(struct cgroup_subsys *subsys, struct cgroup *cgroup, |
1492 | struct cgroup *prev, struct task_struct *tsk, |
1493 | bool threadgroup) |
1494 | { |
1495 | struct io_context *ioc; |
1496 | |
1497 | task_lock(tsk); |
1498 | ioc = tsk->io_context; |
1499 | if (ioc) |
1500 | ioc->cgroup_changed = 1; |
1501 | task_unlock(tsk); |
1502 | } |
1503 | |
1504 | void blkio_policy_register(struct blkio_policy_type *blkiop) |
1505 | { |
1506 | spin_lock(&blkio_list_lock); |
1507 | list_add_tail(&blkiop->list, &blkio_list); |
1508 | spin_unlock(&blkio_list_lock); |
1509 | } |
1510 | EXPORT_SYMBOL_GPL(blkio_policy_register); |
1511 | |
1512 | void blkio_policy_unregister(struct blkio_policy_type *blkiop) |
1513 | { |
1514 | spin_lock(&blkio_list_lock); |
1515 | list_del_init(&blkiop->list); |
1516 | spin_unlock(&blkio_list_lock); |
1517 | } |
1518 | EXPORT_SYMBOL_GPL(blkio_policy_unregister); |
1519 | |
1520 | static int __init init_cgroup_blkio(void) |
1521 | { |
1522 | return cgroup_load_subsys(&blkio_subsys); |
1523 | } |
1524 | |
1525 | static void __exit exit_cgroup_blkio(void) |
1526 | { |
1527 | cgroup_unload_subsys(&blkio_subsys); |
1528 | } |
1529 | |
1530 | module_init(init_cgroup_blkio); |
1531 | module_exit(exit_cgroup_blkio); |
1532 | MODULE_LICENSE("GPL"); |
1533 |
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