Root/
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_task(struct cgroup *, struct task_struct *); |
34 | static void blkiocg_attach_task(struct cgroup *, struct task_struct *); |
35 | static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *); |
36 | static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *); |
37 | |
38 | /* for encoding cft->private value on file */ |
39 | #define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
40 | /* What policy owns the file, proportional or throttle */ |
41 | #define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff) |
42 | #define BLKIOFILE_ATTR(val) ((val) & 0xffff) |
43 | |
44 | struct cgroup_subsys blkio_subsys = { |
45 | .name = "blkio", |
46 | .create = blkiocg_create, |
47 | .can_attach_task = blkiocg_can_attach_task, |
48 | .attach_task = blkiocg_attach_task, |
49 | .destroy = blkiocg_destroy, |
50 | .populate = blkiocg_populate, |
51 | #ifdef CONFIG_BLK_CGROUP |
52 | /* note: blkio_subsys_id is otherwise defined in blk-cgroup.h */ |
53 | .subsys_id = blkio_subsys_id, |
54 | #endif |
55 | .use_id = 1, |
56 | .module = THIS_MODULE, |
57 | }; |
58 | EXPORT_SYMBOL_GPL(blkio_subsys); |
59 | |
60 | static inline void blkio_policy_insert_node(struct blkio_cgroup *blkcg, |
61 | struct blkio_policy_node *pn) |
62 | { |
63 | list_add(&pn->node, &blkcg->policy_list); |
64 | } |
65 | |
66 | static inline bool cftype_blkg_same_policy(struct cftype *cft, |
67 | struct blkio_group *blkg) |
68 | { |
69 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
70 | |
71 | if (blkg->plid == plid) |
72 | return 1; |
73 | |
74 | return 0; |
75 | } |
76 | |
77 | /* Determines if policy node matches cgroup file being accessed */ |
78 | static inline bool pn_matches_cftype(struct cftype *cft, |
79 | struct blkio_policy_node *pn) |
80 | { |
81 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
82 | int fileid = BLKIOFILE_ATTR(cft->private); |
83 | |
84 | return (plid == pn->plid && fileid == pn->fileid); |
85 | } |
86 | |
87 | /* Must be called with blkcg->lock held */ |
88 | static inline void blkio_policy_delete_node(struct blkio_policy_node *pn) |
89 | { |
90 | list_del(&pn->node); |
91 | } |
92 | |
93 | /* Must be called with blkcg->lock held */ |
94 | static struct blkio_policy_node * |
95 | blkio_policy_search_node(const struct blkio_cgroup *blkcg, dev_t dev, |
96 | enum blkio_policy_id plid, int fileid) |
97 | { |
98 | struct blkio_policy_node *pn; |
99 | |
100 | list_for_each_entry(pn, &blkcg->policy_list, node) { |
101 | if (pn->dev == dev && pn->plid == plid && pn->fileid == fileid) |
102 | return pn; |
103 | } |
104 | |
105 | return NULL; |
106 | } |
107 | |
108 | struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) |
109 | { |
110 | return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), |
111 | struct blkio_cgroup, css); |
112 | } |
113 | EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup); |
114 | |
115 | struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk) |
116 | { |
117 | return container_of(task_subsys_state(tsk, blkio_subsys_id), |
118 | struct blkio_cgroup, css); |
119 | } |
120 | EXPORT_SYMBOL_GPL(task_blkio_cgroup); |
121 | |
122 | static inline void |
123 | blkio_update_group_weight(struct blkio_group *blkg, unsigned int weight) |
124 | { |
125 | struct blkio_policy_type *blkiop; |
126 | |
127 | list_for_each_entry(blkiop, &blkio_list, list) { |
128 | /* If this policy does not own the blkg, do not send updates */ |
129 | if (blkiop->plid != blkg->plid) |
130 | continue; |
131 | if (blkiop->ops.blkio_update_group_weight_fn) |
132 | blkiop->ops.blkio_update_group_weight_fn(blkg->key, |
133 | blkg, weight); |
134 | } |
135 | } |
136 | |
137 | static inline void blkio_update_group_bps(struct blkio_group *blkg, u64 bps, |
138 | int fileid) |
139 | { |
140 | struct blkio_policy_type *blkiop; |
141 | |
142 | list_for_each_entry(blkiop, &blkio_list, list) { |
143 | |
144 | /* If this policy does not own the blkg, do not send updates */ |
145 | if (blkiop->plid != blkg->plid) |
146 | continue; |
147 | |
148 | if (fileid == BLKIO_THROTL_read_bps_device |
149 | && blkiop->ops.blkio_update_group_read_bps_fn) |
150 | blkiop->ops.blkio_update_group_read_bps_fn(blkg->key, |
151 | blkg, bps); |
152 | |
153 | if (fileid == BLKIO_THROTL_write_bps_device |
154 | && blkiop->ops.blkio_update_group_write_bps_fn) |
155 | blkiop->ops.blkio_update_group_write_bps_fn(blkg->key, |
156 | blkg, bps); |
157 | } |
158 | } |
159 | |
160 | static inline void blkio_update_group_iops(struct blkio_group *blkg, |
161 | unsigned int iops, int fileid) |
162 | { |
163 | struct blkio_policy_type *blkiop; |
164 | |
165 | list_for_each_entry(blkiop, &blkio_list, list) { |
166 | |
167 | /* If this policy does not own the blkg, do not send updates */ |
168 | if (blkiop->plid != blkg->plid) |
169 | continue; |
170 | |
171 | if (fileid == BLKIO_THROTL_read_iops_device |
172 | && blkiop->ops.blkio_update_group_read_iops_fn) |
173 | blkiop->ops.blkio_update_group_read_iops_fn(blkg->key, |
174 | blkg, iops); |
175 | |
176 | if (fileid == BLKIO_THROTL_write_iops_device |
177 | && blkiop->ops.blkio_update_group_write_iops_fn) |
178 | blkiop->ops.blkio_update_group_write_iops_fn(blkg->key, |
179 | blkg,iops); |
180 | } |
181 | } |
182 | |
183 | /* |
184 | * Add to the appropriate stat variable depending on the request type. |
185 | * This should be called with the blkg->stats_lock held. |
186 | */ |
187 | static void blkio_add_stat(uint64_t *stat, uint64_t add, bool direction, |
188 | bool sync) |
189 | { |
190 | if (direction) |
191 | stat[BLKIO_STAT_WRITE] += add; |
192 | else |
193 | stat[BLKIO_STAT_READ] += add; |
194 | if (sync) |
195 | stat[BLKIO_STAT_SYNC] += add; |
196 | else |
197 | stat[BLKIO_STAT_ASYNC] += add; |
198 | } |
199 | |
200 | /* |
201 | * Decrements the appropriate stat variable if non-zero depending on the |
202 | * request type. Panics on value being zero. |
203 | * This should be called with the blkg->stats_lock held. |
204 | */ |
205 | static void blkio_check_and_dec_stat(uint64_t *stat, bool direction, bool sync) |
206 | { |
207 | if (direction) { |
208 | BUG_ON(stat[BLKIO_STAT_WRITE] == 0); |
209 | stat[BLKIO_STAT_WRITE]--; |
210 | } else { |
211 | BUG_ON(stat[BLKIO_STAT_READ] == 0); |
212 | stat[BLKIO_STAT_READ]--; |
213 | } |
214 | if (sync) { |
215 | BUG_ON(stat[BLKIO_STAT_SYNC] == 0); |
216 | stat[BLKIO_STAT_SYNC]--; |
217 | } else { |
218 | BUG_ON(stat[BLKIO_STAT_ASYNC] == 0); |
219 | stat[BLKIO_STAT_ASYNC]--; |
220 | } |
221 | } |
222 | |
223 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
224 | /* This should be called with the blkg->stats_lock held. */ |
225 | static void blkio_set_start_group_wait_time(struct blkio_group *blkg, |
226 | struct blkio_group *curr_blkg) |
227 | { |
228 | if (blkio_blkg_waiting(&blkg->stats)) |
229 | return; |
230 | if (blkg == curr_blkg) |
231 | return; |
232 | blkg->stats.start_group_wait_time = sched_clock(); |
233 | blkio_mark_blkg_waiting(&blkg->stats); |
234 | } |
235 | |
236 | /* This should be called with the blkg->stats_lock held. */ |
237 | static void blkio_update_group_wait_time(struct blkio_group_stats *stats) |
238 | { |
239 | unsigned long long now; |
240 | |
241 | if (!blkio_blkg_waiting(stats)) |
242 | return; |
243 | |
244 | now = sched_clock(); |
245 | if (time_after64(now, stats->start_group_wait_time)) |
246 | stats->group_wait_time += now - stats->start_group_wait_time; |
247 | blkio_clear_blkg_waiting(stats); |
248 | } |
249 | |
250 | /* This should be called with the blkg->stats_lock held. */ |
251 | static void blkio_end_empty_time(struct blkio_group_stats *stats) |
252 | { |
253 | unsigned long long now; |
254 | |
255 | if (!blkio_blkg_empty(stats)) |
256 | return; |
257 | |
258 | now = sched_clock(); |
259 | if (time_after64(now, stats->start_empty_time)) |
260 | stats->empty_time += now - stats->start_empty_time; |
261 | blkio_clear_blkg_empty(stats); |
262 | } |
263 | |
264 | void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) |
265 | { |
266 | unsigned long flags; |
267 | |
268 | spin_lock_irqsave(&blkg->stats_lock, flags); |
269 | BUG_ON(blkio_blkg_idling(&blkg->stats)); |
270 | blkg->stats.start_idle_time = sched_clock(); |
271 | blkio_mark_blkg_idling(&blkg->stats); |
272 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
273 | } |
274 | EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats); |
275 | |
276 | void blkiocg_update_idle_time_stats(struct blkio_group *blkg) |
277 | { |
278 | unsigned long flags; |
279 | unsigned long long now; |
280 | struct blkio_group_stats *stats; |
281 | |
282 | spin_lock_irqsave(&blkg->stats_lock, flags); |
283 | stats = &blkg->stats; |
284 | if (blkio_blkg_idling(stats)) { |
285 | now = sched_clock(); |
286 | if (time_after64(now, stats->start_idle_time)) |
287 | stats->idle_time += now - stats->start_idle_time; |
288 | blkio_clear_blkg_idling(stats); |
289 | } |
290 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
291 | } |
292 | EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats); |
293 | |
294 | void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) |
295 | { |
296 | unsigned long flags; |
297 | struct blkio_group_stats *stats; |
298 | |
299 | spin_lock_irqsave(&blkg->stats_lock, flags); |
300 | stats = &blkg->stats; |
301 | stats->avg_queue_size_sum += |
302 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] + |
303 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]; |
304 | stats->avg_queue_size_samples++; |
305 | blkio_update_group_wait_time(stats); |
306 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
307 | } |
308 | EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats); |
309 | |
310 | void blkiocg_set_start_empty_time(struct blkio_group *blkg) |
311 | { |
312 | unsigned long flags; |
313 | struct blkio_group_stats *stats; |
314 | |
315 | spin_lock_irqsave(&blkg->stats_lock, flags); |
316 | stats = &blkg->stats; |
317 | |
318 | if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] || |
319 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) { |
320 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
321 | return; |
322 | } |
323 | |
324 | /* |
325 | * group is already marked empty. This can happen if cfqq got new |
326 | * request in parent group and moved to this group while being added |
327 | * to service tree. Just ignore the event and move on. |
328 | */ |
329 | if(blkio_blkg_empty(stats)) { |
330 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
331 | return; |
332 | } |
333 | |
334 | stats->start_empty_time = sched_clock(); |
335 | blkio_mark_blkg_empty(stats); |
336 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
337 | } |
338 | EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time); |
339 | |
340 | void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
341 | unsigned long dequeue) |
342 | { |
343 | blkg->stats.dequeue += dequeue; |
344 | } |
345 | EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats); |
346 | #else |
347 | static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg, |
348 | struct blkio_group *curr_blkg) {} |
349 | static inline void blkio_end_empty_time(struct blkio_group_stats *stats) {} |
350 | #endif |
351 | |
352 | void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
353 | struct blkio_group *curr_blkg, bool direction, |
354 | bool sync) |
355 | { |
356 | unsigned long flags; |
357 | |
358 | spin_lock_irqsave(&blkg->stats_lock, flags); |
359 | blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction, |
360 | sync); |
361 | blkio_end_empty_time(&blkg->stats); |
362 | blkio_set_start_group_wait_time(blkg, curr_blkg); |
363 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
364 | } |
365 | EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats); |
366 | |
367 | void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
368 | bool direction, bool sync) |
369 | { |
370 | unsigned long flags; |
371 | |
372 | spin_lock_irqsave(&blkg->stats_lock, flags); |
373 | blkio_check_and_dec_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], |
374 | direction, sync); |
375 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
376 | } |
377 | EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats); |
378 | |
379 | void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time, |
380 | unsigned long unaccounted_time) |
381 | { |
382 | unsigned long flags; |
383 | |
384 | spin_lock_irqsave(&blkg->stats_lock, flags); |
385 | blkg->stats.time += time; |
386 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
387 | blkg->stats.unaccounted_time += unaccounted_time; |
388 | #endif |
389 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
390 | } |
391 | EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used); |
392 | |
393 | /* |
394 | * should be called under rcu read lock or queue lock to make sure blkg pointer |
395 | * is valid. |
396 | */ |
397 | void blkiocg_update_dispatch_stats(struct blkio_group *blkg, |
398 | uint64_t bytes, bool direction, bool sync) |
399 | { |
400 | struct blkio_group_stats_cpu *stats_cpu; |
401 | unsigned long flags; |
402 | |
403 | /* |
404 | * Disabling interrupts to provide mutual exclusion between two |
405 | * writes on same cpu. It probably is not needed for 64bit. Not |
406 | * optimizing that case yet. |
407 | */ |
408 | local_irq_save(flags); |
409 | |
410 | stats_cpu = this_cpu_ptr(blkg->stats_cpu); |
411 | |
412 | u64_stats_update_begin(&stats_cpu->syncp); |
413 | stats_cpu->sectors += bytes >> 9; |
414 | blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_SERVICED], |
415 | 1, direction, sync); |
416 | blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_SERVICE_BYTES], |
417 | bytes, direction, sync); |
418 | u64_stats_update_end(&stats_cpu->syncp); |
419 | local_irq_restore(flags); |
420 | } |
421 | EXPORT_SYMBOL_GPL(blkiocg_update_dispatch_stats); |
422 | |
423 | void blkiocg_update_completion_stats(struct blkio_group *blkg, |
424 | uint64_t start_time, uint64_t io_start_time, bool direction, bool sync) |
425 | { |
426 | struct blkio_group_stats *stats; |
427 | unsigned long flags; |
428 | unsigned long long now = sched_clock(); |
429 | |
430 | spin_lock_irqsave(&blkg->stats_lock, flags); |
431 | stats = &blkg->stats; |
432 | if (time_after64(now, io_start_time)) |
433 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_TIME], |
434 | now - io_start_time, direction, sync); |
435 | if (time_after64(io_start_time, start_time)) |
436 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_WAIT_TIME], |
437 | io_start_time - start_time, direction, sync); |
438 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
439 | } |
440 | EXPORT_SYMBOL_GPL(blkiocg_update_completion_stats); |
441 | |
442 | /* Merged stats are per cpu. */ |
443 | void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction, |
444 | bool sync) |
445 | { |
446 | struct blkio_group_stats_cpu *stats_cpu; |
447 | unsigned long flags; |
448 | |
449 | /* |
450 | * Disabling interrupts to provide mutual exclusion between two |
451 | * writes on same cpu. It probably is not needed for 64bit. Not |
452 | * optimizing that case yet. |
453 | */ |
454 | local_irq_save(flags); |
455 | |
456 | stats_cpu = this_cpu_ptr(blkg->stats_cpu); |
457 | |
458 | u64_stats_update_begin(&stats_cpu->syncp); |
459 | blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_MERGED], 1, |
460 | direction, sync); |
461 | u64_stats_update_end(&stats_cpu->syncp); |
462 | local_irq_restore(flags); |
463 | } |
464 | EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats); |
465 | |
466 | /* |
467 | * This function allocates the per cpu stats for blkio_group. Should be called |
468 | * from sleepable context as alloc_per_cpu() requires that. |
469 | */ |
470 | int blkio_alloc_blkg_stats(struct blkio_group *blkg) |
471 | { |
472 | /* Allocate memory for per cpu stats */ |
473 | blkg->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu); |
474 | if (!blkg->stats_cpu) |
475 | return -ENOMEM; |
476 | return 0; |
477 | } |
478 | EXPORT_SYMBOL_GPL(blkio_alloc_blkg_stats); |
479 | |
480 | void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
481 | struct blkio_group *blkg, void *key, dev_t dev, |
482 | enum blkio_policy_id plid) |
483 | { |
484 | unsigned long flags; |
485 | |
486 | spin_lock_irqsave(&blkcg->lock, flags); |
487 | spin_lock_init(&blkg->stats_lock); |
488 | rcu_assign_pointer(blkg->key, key); |
489 | blkg->blkcg_id = css_id(&blkcg->css); |
490 | hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list); |
491 | blkg->plid = plid; |
492 | spin_unlock_irqrestore(&blkcg->lock, flags); |
493 | /* Need to take css reference ? */ |
494 | cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path)); |
495 | blkg->dev = dev; |
496 | } |
497 | EXPORT_SYMBOL_GPL(blkiocg_add_blkio_group); |
498 | |
499 | static void __blkiocg_del_blkio_group(struct blkio_group *blkg) |
500 | { |
501 | hlist_del_init_rcu(&blkg->blkcg_node); |
502 | blkg->blkcg_id = 0; |
503 | } |
504 | |
505 | /* |
506 | * returns 0 if blkio_group was still on cgroup list. Otherwise returns 1 |
507 | * indicating that blk_group was unhashed by the time we got to it. |
508 | */ |
509 | int blkiocg_del_blkio_group(struct blkio_group *blkg) |
510 | { |
511 | struct blkio_cgroup *blkcg; |
512 | unsigned long flags; |
513 | struct cgroup_subsys_state *css; |
514 | int ret = 1; |
515 | |
516 | rcu_read_lock(); |
517 | css = css_lookup(&blkio_subsys, blkg->blkcg_id); |
518 | if (css) { |
519 | blkcg = container_of(css, struct blkio_cgroup, css); |
520 | spin_lock_irqsave(&blkcg->lock, flags); |
521 | if (!hlist_unhashed(&blkg->blkcg_node)) { |
522 | __blkiocg_del_blkio_group(blkg); |
523 | ret = 0; |
524 | } |
525 | spin_unlock_irqrestore(&blkcg->lock, flags); |
526 | } |
527 | |
528 | rcu_read_unlock(); |
529 | return ret; |
530 | } |
531 | EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group); |
532 | |
533 | /* called under rcu_read_lock(). */ |
534 | struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) |
535 | { |
536 | struct blkio_group *blkg; |
537 | struct hlist_node *n; |
538 | void *__key; |
539 | |
540 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { |
541 | __key = blkg->key; |
542 | if (__key == key) |
543 | return blkg; |
544 | } |
545 | |
546 | return NULL; |
547 | } |
548 | EXPORT_SYMBOL_GPL(blkiocg_lookup_group); |
549 | |
550 | static void blkio_reset_stats_cpu(struct blkio_group *blkg) |
551 | { |
552 | struct blkio_group_stats_cpu *stats_cpu; |
553 | int i, j, k; |
554 | /* |
555 | * Note: On 64 bit arch this should not be an issue. This has the |
556 | * possibility of returning some inconsistent value on 32bit arch |
557 | * as 64bit update on 32bit is non atomic. Taking care of this |
558 | * corner case makes code very complicated, like sending IPIs to |
559 | * cpus, taking care of stats of offline cpus etc. |
560 | * |
561 | * reset stats is anyway more of a debug feature and this sounds a |
562 | * corner case. So I am not complicating the code yet until and |
563 | * unless this becomes a real issue. |
564 | */ |
565 | for_each_possible_cpu(i) { |
566 | stats_cpu = per_cpu_ptr(blkg->stats_cpu, i); |
567 | stats_cpu->sectors = 0; |
568 | for(j = 0; j < BLKIO_STAT_CPU_NR; j++) |
569 | for (k = 0; k < BLKIO_STAT_TOTAL; k++) |
570 | stats_cpu->stat_arr_cpu[j][k] = 0; |
571 | } |
572 | } |
573 | |
574 | static int |
575 | blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) |
576 | { |
577 | struct blkio_cgroup *blkcg; |
578 | struct blkio_group *blkg; |
579 | struct blkio_group_stats *stats; |
580 | struct hlist_node *n; |
581 | uint64_t queued[BLKIO_STAT_TOTAL]; |
582 | int i; |
583 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
584 | bool idling, waiting, empty; |
585 | unsigned long long now = sched_clock(); |
586 | #endif |
587 | |
588 | blkcg = cgroup_to_blkio_cgroup(cgroup); |
589 | spin_lock_irq(&blkcg->lock); |
590 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
591 | spin_lock(&blkg->stats_lock); |
592 | stats = &blkg->stats; |
593 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
594 | idling = blkio_blkg_idling(stats); |
595 | waiting = blkio_blkg_waiting(stats); |
596 | empty = blkio_blkg_empty(stats); |
597 | #endif |
598 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
599 | queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i]; |
600 | memset(stats, 0, sizeof(struct blkio_group_stats)); |
601 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
602 | stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i]; |
603 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
604 | if (idling) { |
605 | blkio_mark_blkg_idling(stats); |
606 | stats->start_idle_time = now; |
607 | } |
608 | if (waiting) { |
609 | blkio_mark_blkg_waiting(stats); |
610 | stats->start_group_wait_time = now; |
611 | } |
612 | if (empty) { |
613 | blkio_mark_blkg_empty(stats); |
614 | stats->start_empty_time = now; |
615 | } |
616 | #endif |
617 | spin_unlock(&blkg->stats_lock); |
618 | |
619 | /* Reset Per cpu stats which don't take blkg->stats_lock */ |
620 | blkio_reset_stats_cpu(blkg); |
621 | } |
622 | |
623 | spin_unlock_irq(&blkcg->lock); |
624 | return 0; |
625 | } |
626 | |
627 | static void blkio_get_key_name(enum stat_sub_type type, dev_t dev, char *str, |
628 | int chars_left, bool diskname_only) |
629 | { |
630 | snprintf(str, chars_left, "%d:%d", MAJOR(dev), MINOR(dev)); |
631 | chars_left -= strlen(str); |
632 | if (chars_left <= 0) { |
633 | printk(KERN_WARNING |
634 | "Possibly incorrect cgroup stat display format"); |
635 | return; |
636 | } |
637 | if (diskname_only) |
638 | return; |
639 | switch (type) { |
640 | case BLKIO_STAT_READ: |
641 | strlcat(str, " Read", chars_left); |
642 | break; |
643 | case BLKIO_STAT_WRITE: |
644 | strlcat(str, " Write", chars_left); |
645 | break; |
646 | case BLKIO_STAT_SYNC: |
647 | strlcat(str, " Sync", chars_left); |
648 | break; |
649 | case BLKIO_STAT_ASYNC: |
650 | strlcat(str, " Async", chars_left); |
651 | break; |
652 | case BLKIO_STAT_TOTAL: |
653 | strlcat(str, " Total", chars_left); |
654 | break; |
655 | default: |
656 | strlcat(str, " Invalid", chars_left); |
657 | } |
658 | } |
659 | |
660 | static uint64_t blkio_fill_stat(char *str, int chars_left, uint64_t val, |
661 | struct cgroup_map_cb *cb, dev_t dev) |
662 | { |
663 | blkio_get_key_name(0, dev, str, chars_left, true); |
664 | cb->fill(cb, str, val); |
665 | return val; |
666 | } |
667 | |
668 | |
669 | static uint64_t blkio_read_stat_cpu(struct blkio_group *blkg, |
670 | enum stat_type_cpu type, enum stat_sub_type sub_type) |
671 | { |
672 | int cpu; |
673 | struct blkio_group_stats_cpu *stats_cpu; |
674 | u64 val = 0, tval; |
675 | |
676 | for_each_possible_cpu(cpu) { |
677 | unsigned int start; |
678 | stats_cpu = per_cpu_ptr(blkg->stats_cpu, cpu); |
679 | |
680 | do { |
681 | start = u64_stats_fetch_begin(&stats_cpu->syncp); |
682 | if (type == BLKIO_STAT_CPU_SECTORS) |
683 | tval = stats_cpu->sectors; |
684 | else |
685 | tval = stats_cpu->stat_arr_cpu[type][sub_type]; |
686 | } while(u64_stats_fetch_retry(&stats_cpu->syncp, start)); |
687 | |
688 | val += tval; |
689 | } |
690 | |
691 | return val; |
692 | } |
693 | |
694 | static uint64_t blkio_get_stat_cpu(struct blkio_group *blkg, |
695 | struct cgroup_map_cb *cb, dev_t dev, enum stat_type_cpu type) |
696 | { |
697 | uint64_t disk_total, val; |
698 | char key_str[MAX_KEY_LEN]; |
699 | enum stat_sub_type sub_type; |
700 | |
701 | if (type == BLKIO_STAT_CPU_SECTORS) { |
702 | val = blkio_read_stat_cpu(blkg, type, 0); |
703 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, val, cb, dev); |
704 | } |
705 | |
706 | for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; |
707 | sub_type++) { |
708 | blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false); |
709 | val = blkio_read_stat_cpu(blkg, type, sub_type); |
710 | cb->fill(cb, key_str, val); |
711 | } |
712 | |
713 | disk_total = blkio_read_stat_cpu(blkg, type, BLKIO_STAT_READ) + |
714 | blkio_read_stat_cpu(blkg, type, BLKIO_STAT_WRITE); |
715 | |
716 | blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false); |
717 | cb->fill(cb, key_str, disk_total); |
718 | return disk_total; |
719 | } |
720 | |
721 | /* This should be called with blkg->stats_lock held */ |
722 | static uint64_t blkio_get_stat(struct blkio_group *blkg, |
723 | struct cgroup_map_cb *cb, dev_t dev, enum stat_type type) |
724 | { |
725 | uint64_t disk_total; |
726 | char key_str[MAX_KEY_LEN]; |
727 | enum stat_sub_type sub_type; |
728 | |
729 | if (type == BLKIO_STAT_TIME) |
730 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
731 | blkg->stats.time, cb, dev); |
732 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
733 | if (type == BLKIO_STAT_UNACCOUNTED_TIME) |
734 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
735 | blkg->stats.unaccounted_time, cb, dev); |
736 | if (type == BLKIO_STAT_AVG_QUEUE_SIZE) { |
737 | uint64_t sum = blkg->stats.avg_queue_size_sum; |
738 | uint64_t samples = blkg->stats.avg_queue_size_samples; |
739 | if (samples) |
740 | do_div(sum, samples); |
741 | else |
742 | sum = 0; |
743 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, sum, cb, dev); |
744 | } |
745 | if (type == BLKIO_STAT_GROUP_WAIT_TIME) |
746 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
747 | blkg->stats.group_wait_time, cb, dev); |
748 | if (type == BLKIO_STAT_IDLE_TIME) |
749 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
750 | blkg->stats.idle_time, cb, dev); |
751 | if (type == BLKIO_STAT_EMPTY_TIME) |
752 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
753 | blkg->stats.empty_time, cb, dev); |
754 | if (type == BLKIO_STAT_DEQUEUE) |
755 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
756 | blkg->stats.dequeue, cb, dev); |
757 | #endif |
758 | |
759 | for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; |
760 | sub_type++) { |
761 | blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false); |
762 | cb->fill(cb, key_str, blkg->stats.stat_arr[type][sub_type]); |
763 | } |
764 | disk_total = blkg->stats.stat_arr[type][BLKIO_STAT_READ] + |
765 | blkg->stats.stat_arr[type][BLKIO_STAT_WRITE]; |
766 | blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false); |
767 | cb->fill(cb, key_str, disk_total); |
768 | return disk_total; |
769 | } |
770 | |
771 | static int blkio_check_dev_num(dev_t dev) |
772 | { |
773 | int part = 0; |
774 | struct gendisk *disk; |
775 | |
776 | disk = get_gendisk(dev, &part); |
777 | if (!disk || part) |
778 | return -ENODEV; |
779 | |
780 | return 0; |
781 | } |
782 | |
783 | static int blkio_policy_parse_and_set(char *buf, |
784 | struct blkio_policy_node *newpn, enum blkio_policy_id plid, int fileid) |
785 | { |
786 | char *s[4], *p, *major_s = NULL, *minor_s = NULL; |
787 | int ret; |
788 | unsigned long major, minor, temp; |
789 | int i = 0; |
790 | dev_t dev; |
791 | u64 bps, iops; |
792 | |
793 | memset(s, 0, sizeof(s)); |
794 | |
795 | while ((p = strsep(&buf, " ")) != NULL) { |
796 | if (!*p) |
797 | continue; |
798 | |
799 | s[i++] = p; |
800 | |
801 | /* Prevent from inputing too many things */ |
802 | if (i == 3) |
803 | break; |
804 | } |
805 | |
806 | if (i != 2) |
807 | return -EINVAL; |
808 | |
809 | p = strsep(&s[0], ":"); |
810 | if (p != NULL) |
811 | major_s = p; |
812 | else |
813 | return -EINVAL; |
814 | |
815 | minor_s = s[0]; |
816 | if (!minor_s) |
817 | return -EINVAL; |
818 | |
819 | ret = strict_strtoul(major_s, 10, &major); |
820 | if (ret) |
821 | return -EINVAL; |
822 | |
823 | ret = strict_strtoul(minor_s, 10, &minor); |
824 | if (ret) |
825 | return -EINVAL; |
826 | |
827 | dev = MKDEV(major, minor); |
828 | |
829 | ret = blkio_check_dev_num(dev); |
830 | if (ret) |
831 | return ret; |
832 | |
833 | newpn->dev = dev; |
834 | |
835 | if (s[1] == NULL) |
836 | return -EINVAL; |
837 | |
838 | switch (plid) { |
839 | case BLKIO_POLICY_PROP: |
840 | ret = strict_strtoul(s[1], 10, &temp); |
841 | if (ret || (temp < BLKIO_WEIGHT_MIN && temp > 0) || |
842 | temp > BLKIO_WEIGHT_MAX) |
843 | return -EINVAL; |
844 | |
845 | newpn->plid = plid; |
846 | newpn->fileid = fileid; |
847 | newpn->val.weight = temp; |
848 | break; |
849 | case BLKIO_POLICY_THROTL: |
850 | switch(fileid) { |
851 | case BLKIO_THROTL_read_bps_device: |
852 | case BLKIO_THROTL_write_bps_device: |
853 | ret = strict_strtoull(s[1], 10, &bps); |
854 | if (ret) |
855 | return -EINVAL; |
856 | |
857 | newpn->plid = plid; |
858 | newpn->fileid = fileid; |
859 | newpn->val.bps = bps; |
860 | break; |
861 | case BLKIO_THROTL_read_iops_device: |
862 | case BLKIO_THROTL_write_iops_device: |
863 | ret = strict_strtoull(s[1], 10, &iops); |
864 | if (ret) |
865 | return -EINVAL; |
866 | |
867 | if (iops > THROTL_IOPS_MAX) |
868 | return -EINVAL; |
869 | |
870 | newpn->plid = plid; |
871 | newpn->fileid = fileid; |
872 | newpn->val.iops = (unsigned int)iops; |
873 | break; |
874 | } |
875 | break; |
876 | default: |
877 | BUG(); |
878 | } |
879 | |
880 | return 0; |
881 | } |
882 | |
883 | unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg, |
884 | dev_t dev) |
885 | { |
886 | struct blkio_policy_node *pn; |
887 | |
888 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_PROP, |
889 | BLKIO_PROP_weight_device); |
890 | if (pn) |
891 | return pn->val.weight; |
892 | else |
893 | return blkcg->weight; |
894 | } |
895 | EXPORT_SYMBOL_GPL(blkcg_get_weight); |
896 | |
897 | uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, dev_t dev) |
898 | { |
899 | struct blkio_policy_node *pn; |
900 | |
901 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
902 | BLKIO_THROTL_read_bps_device); |
903 | if (pn) |
904 | return pn->val.bps; |
905 | else |
906 | return -1; |
907 | } |
908 | |
909 | uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, dev_t dev) |
910 | { |
911 | struct blkio_policy_node *pn; |
912 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
913 | BLKIO_THROTL_write_bps_device); |
914 | if (pn) |
915 | return pn->val.bps; |
916 | else |
917 | return -1; |
918 | } |
919 | |
920 | unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg, dev_t dev) |
921 | { |
922 | struct blkio_policy_node *pn; |
923 | |
924 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
925 | BLKIO_THROTL_read_iops_device); |
926 | if (pn) |
927 | return pn->val.iops; |
928 | else |
929 | return -1; |
930 | } |
931 | |
932 | unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg, dev_t dev) |
933 | { |
934 | struct blkio_policy_node *pn; |
935 | pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, |
936 | BLKIO_THROTL_write_iops_device); |
937 | if (pn) |
938 | return pn->val.iops; |
939 | else |
940 | return -1; |
941 | } |
942 | |
943 | /* Checks whether user asked for deleting a policy rule */ |
944 | static bool blkio_delete_rule_command(struct blkio_policy_node *pn) |
945 | { |
946 | switch(pn->plid) { |
947 | case BLKIO_POLICY_PROP: |
948 | if (pn->val.weight == 0) |
949 | return 1; |
950 | break; |
951 | case BLKIO_POLICY_THROTL: |
952 | switch(pn->fileid) { |
953 | case BLKIO_THROTL_read_bps_device: |
954 | case BLKIO_THROTL_write_bps_device: |
955 | if (pn->val.bps == 0) |
956 | return 1; |
957 | break; |
958 | case BLKIO_THROTL_read_iops_device: |
959 | case BLKIO_THROTL_write_iops_device: |
960 | if (pn->val.iops == 0) |
961 | return 1; |
962 | } |
963 | break; |
964 | default: |
965 | BUG(); |
966 | } |
967 | |
968 | return 0; |
969 | } |
970 | |
971 | static void blkio_update_policy_rule(struct blkio_policy_node *oldpn, |
972 | struct blkio_policy_node *newpn) |
973 | { |
974 | switch(oldpn->plid) { |
975 | case BLKIO_POLICY_PROP: |
976 | oldpn->val.weight = newpn->val.weight; |
977 | break; |
978 | case BLKIO_POLICY_THROTL: |
979 | switch(newpn->fileid) { |
980 | case BLKIO_THROTL_read_bps_device: |
981 | case BLKIO_THROTL_write_bps_device: |
982 | oldpn->val.bps = newpn->val.bps; |
983 | break; |
984 | case BLKIO_THROTL_read_iops_device: |
985 | case BLKIO_THROTL_write_iops_device: |
986 | oldpn->val.iops = newpn->val.iops; |
987 | } |
988 | break; |
989 | default: |
990 | BUG(); |
991 | } |
992 | } |
993 | |
994 | /* |
995 | * Some rules/values in blkg have changed. Propagate those to respective |
996 | * policies. |
997 | */ |
998 | static void blkio_update_blkg_policy(struct blkio_cgroup *blkcg, |
999 | struct blkio_group *blkg, struct blkio_policy_node *pn) |
1000 | { |
1001 | unsigned int weight, iops; |
1002 | u64 bps; |
1003 | |
1004 | switch(pn->plid) { |
1005 | case BLKIO_POLICY_PROP: |
1006 | weight = pn->val.weight ? pn->val.weight : |
1007 | blkcg->weight; |
1008 | blkio_update_group_weight(blkg, weight); |
1009 | break; |
1010 | case BLKIO_POLICY_THROTL: |
1011 | switch(pn->fileid) { |
1012 | case BLKIO_THROTL_read_bps_device: |
1013 | case BLKIO_THROTL_write_bps_device: |
1014 | bps = pn->val.bps ? pn->val.bps : (-1); |
1015 | blkio_update_group_bps(blkg, bps, pn->fileid); |
1016 | break; |
1017 | case BLKIO_THROTL_read_iops_device: |
1018 | case BLKIO_THROTL_write_iops_device: |
1019 | iops = pn->val.iops ? pn->val.iops : (-1); |
1020 | blkio_update_group_iops(blkg, iops, pn->fileid); |
1021 | break; |
1022 | } |
1023 | break; |
1024 | default: |
1025 | BUG(); |
1026 | } |
1027 | } |
1028 | |
1029 | /* |
1030 | * A policy node rule has been updated. Propagate this update to all the |
1031 | * block groups which might be affected by this update. |
1032 | */ |
1033 | static void blkio_update_policy_node_blkg(struct blkio_cgroup *blkcg, |
1034 | struct blkio_policy_node *pn) |
1035 | { |
1036 | struct blkio_group *blkg; |
1037 | struct hlist_node *n; |
1038 | |
1039 | spin_lock(&blkio_list_lock); |
1040 | spin_lock_irq(&blkcg->lock); |
1041 | |
1042 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
1043 | if (pn->dev != blkg->dev || pn->plid != blkg->plid) |
1044 | continue; |
1045 | blkio_update_blkg_policy(blkcg, blkg, pn); |
1046 | } |
1047 | |
1048 | spin_unlock_irq(&blkcg->lock); |
1049 | spin_unlock(&blkio_list_lock); |
1050 | } |
1051 | |
1052 | static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft, |
1053 | const char *buffer) |
1054 | { |
1055 | int ret = 0; |
1056 | char *buf; |
1057 | struct blkio_policy_node *newpn, *pn; |
1058 | struct blkio_cgroup *blkcg; |
1059 | int keep_newpn = 0; |
1060 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1061 | int fileid = BLKIOFILE_ATTR(cft->private); |
1062 | |
1063 | buf = kstrdup(buffer, GFP_KERNEL); |
1064 | if (!buf) |
1065 | return -ENOMEM; |
1066 | |
1067 | newpn = kzalloc(sizeof(*newpn), GFP_KERNEL); |
1068 | if (!newpn) { |
1069 | ret = -ENOMEM; |
1070 | goto free_buf; |
1071 | } |
1072 | |
1073 | ret = blkio_policy_parse_and_set(buf, newpn, plid, fileid); |
1074 | if (ret) |
1075 | goto free_newpn; |
1076 | |
1077 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1078 | |
1079 | spin_lock_irq(&blkcg->lock); |
1080 | |
1081 | pn = blkio_policy_search_node(blkcg, newpn->dev, plid, fileid); |
1082 | if (!pn) { |
1083 | if (!blkio_delete_rule_command(newpn)) { |
1084 | blkio_policy_insert_node(blkcg, newpn); |
1085 | keep_newpn = 1; |
1086 | } |
1087 | spin_unlock_irq(&blkcg->lock); |
1088 | goto update_io_group; |
1089 | } |
1090 | |
1091 | if (blkio_delete_rule_command(newpn)) { |
1092 | blkio_policy_delete_node(pn); |
1093 | spin_unlock_irq(&blkcg->lock); |
1094 | goto update_io_group; |
1095 | } |
1096 | spin_unlock_irq(&blkcg->lock); |
1097 | |
1098 | blkio_update_policy_rule(pn, newpn); |
1099 | |
1100 | update_io_group: |
1101 | blkio_update_policy_node_blkg(blkcg, newpn); |
1102 | |
1103 | free_newpn: |
1104 | if (!keep_newpn) |
1105 | kfree(newpn); |
1106 | free_buf: |
1107 | kfree(buf); |
1108 | return ret; |
1109 | } |
1110 | |
1111 | static void |
1112 | blkio_print_policy_node(struct seq_file *m, struct blkio_policy_node *pn) |
1113 | { |
1114 | switch(pn->plid) { |
1115 | case BLKIO_POLICY_PROP: |
1116 | if (pn->fileid == BLKIO_PROP_weight_device) |
1117 | seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev), |
1118 | MINOR(pn->dev), pn->val.weight); |
1119 | break; |
1120 | case BLKIO_POLICY_THROTL: |
1121 | switch(pn->fileid) { |
1122 | case BLKIO_THROTL_read_bps_device: |
1123 | case BLKIO_THROTL_write_bps_device: |
1124 | seq_printf(m, "%u:%u\t%llu\n", MAJOR(pn->dev), |
1125 | MINOR(pn->dev), pn->val.bps); |
1126 | break; |
1127 | case BLKIO_THROTL_read_iops_device: |
1128 | case BLKIO_THROTL_write_iops_device: |
1129 | seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev), |
1130 | MINOR(pn->dev), pn->val.iops); |
1131 | break; |
1132 | } |
1133 | break; |
1134 | default: |
1135 | BUG(); |
1136 | } |
1137 | } |
1138 | |
1139 | /* cgroup files which read their data from policy nodes end up here */ |
1140 | static void blkio_read_policy_node_files(struct cftype *cft, |
1141 | struct blkio_cgroup *blkcg, struct seq_file *m) |
1142 | { |
1143 | struct blkio_policy_node *pn; |
1144 | |
1145 | if (!list_empty(&blkcg->policy_list)) { |
1146 | spin_lock_irq(&blkcg->lock); |
1147 | list_for_each_entry(pn, &blkcg->policy_list, node) { |
1148 | if (!pn_matches_cftype(cft, pn)) |
1149 | continue; |
1150 | blkio_print_policy_node(m, pn); |
1151 | } |
1152 | spin_unlock_irq(&blkcg->lock); |
1153 | } |
1154 | } |
1155 | |
1156 | static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft, |
1157 | struct seq_file *m) |
1158 | { |
1159 | struct blkio_cgroup *blkcg; |
1160 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1161 | int name = BLKIOFILE_ATTR(cft->private); |
1162 | |
1163 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1164 | |
1165 | switch(plid) { |
1166 | case BLKIO_POLICY_PROP: |
1167 | switch(name) { |
1168 | case BLKIO_PROP_weight_device: |
1169 | blkio_read_policy_node_files(cft, blkcg, m); |
1170 | return 0; |
1171 | default: |
1172 | BUG(); |
1173 | } |
1174 | break; |
1175 | case BLKIO_POLICY_THROTL: |
1176 | switch(name){ |
1177 | case BLKIO_THROTL_read_bps_device: |
1178 | case BLKIO_THROTL_write_bps_device: |
1179 | case BLKIO_THROTL_read_iops_device: |
1180 | case BLKIO_THROTL_write_iops_device: |
1181 | blkio_read_policy_node_files(cft, blkcg, m); |
1182 | return 0; |
1183 | default: |
1184 | BUG(); |
1185 | } |
1186 | break; |
1187 | default: |
1188 | BUG(); |
1189 | } |
1190 | |
1191 | return 0; |
1192 | } |
1193 | |
1194 | static int blkio_read_blkg_stats(struct blkio_cgroup *blkcg, |
1195 | struct cftype *cft, struct cgroup_map_cb *cb, |
1196 | enum stat_type type, bool show_total, bool pcpu) |
1197 | { |
1198 | struct blkio_group *blkg; |
1199 | struct hlist_node *n; |
1200 | uint64_t cgroup_total = 0; |
1201 | |
1202 | rcu_read_lock(); |
1203 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { |
1204 | if (blkg->dev) { |
1205 | if (!cftype_blkg_same_policy(cft, blkg)) |
1206 | continue; |
1207 | if (pcpu) |
1208 | cgroup_total += blkio_get_stat_cpu(blkg, cb, |
1209 | blkg->dev, type); |
1210 | else { |
1211 | spin_lock_irq(&blkg->stats_lock); |
1212 | cgroup_total += blkio_get_stat(blkg, cb, |
1213 | blkg->dev, type); |
1214 | spin_unlock_irq(&blkg->stats_lock); |
1215 | } |
1216 | } |
1217 | } |
1218 | if (show_total) |
1219 | cb->fill(cb, "Total", cgroup_total); |
1220 | rcu_read_unlock(); |
1221 | return 0; |
1222 | } |
1223 | |
1224 | /* All map kind of cgroup file get serviced by this function */ |
1225 | static int blkiocg_file_read_map(struct cgroup *cgrp, struct cftype *cft, |
1226 | struct cgroup_map_cb *cb) |
1227 | { |
1228 | struct blkio_cgroup *blkcg; |
1229 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1230 | int name = BLKIOFILE_ATTR(cft->private); |
1231 | |
1232 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1233 | |
1234 | switch(plid) { |
1235 | case BLKIO_POLICY_PROP: |
1236 | switch(name) { |
1237 | case BLKIO_PROP_time: |
1238 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1239 | BLKIO_STAT_TIME, 0, 0); |
1240 | case BLKIO_PROP_sectors: |
1241 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1242 | BLKIO_STAT_CPU_SECTORS, 0, 1); |
1243 | case BLKIO_PROP_io_service_bytes: |
1244 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1245 | BLKIO_STAT_CPU_SERVICE_BYTES, 1, 1); |
1246 | case BLKIO_PROP_io_serviced: |
1247 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1248 | BLKIO_STAT_CPU_SERVICED, 1, 1); |
1249 | case BLKIO_PROP_io_service_time: |
1250 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1251 | BLKIO_STAT_SERVICE_TIME, 1, 0); |
1252 | case BLKIO_PROP_io_wait_time: |
1253 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1254 | BLKIO_STAT_WAIT_TIME, 1, 0); |
1255 | case BLKIO_PROP_io_merged: |
1256 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1257 | BLKIO_STAT_CPU_MERGED, 1, 1); |
1258 | case BLKIO_PROP_io_queued: |
1259 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1260 | BLKIO_STAT_QUEUED, 1, 0); |
1261 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
1262 | case BLKIO_PROP_unaccounted_time: |
1263 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1264 | BLKIO_STAT_UNACCOUNTED_TIME, 0, 0); |
1265 | case BLKIO_PROP_dequeue: |
1266 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1267 | BLKIO_STAT_DEQUEUE, 0, 0); |
1268 | case BLKIO_PROP_avg_queue_size: |
1269 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1270 | BLKIO_STAT_AVG_QUEUE_SIZE, 0, 0); |
1271 | case BLKIO_PROP_group_wait_time: |
1272 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1273 | BLKIO_STAT_GROUP_WAIT_TIME, 0, 0); |
1274 | case BLKIO_PROP_idle_time: |
1275 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1276 | BLKIO_STAT_IDLE_TIME, 0, 0); |
1277 | case BLKIO_PROP_empty_time: |
1278 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1279 | BLKIO_STAT_EMPTY_TIME, 0, 0); |
1280 | #endif |
1281 | default: |
1282 | BUG(); |
1283 | } |
1284 | break; |
1285 | case BLKIO_POLICY_THROTL: |
1286 | switch(name){ |
1287 | case BLKIO_THROTL_io_service_bytes: |
1288 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1289 | BLKIO_STAT_CPU_SERVICE_BYTES, 1, 1); |
1290 | case BLKIO_THROTL_io_serviced: |
1291 | return blkio_read_blkg_stats(blkcg, cft, cb, |
1292 | BLKIO_STAT_CPU_SERVICED, 1, 1); |
1293 | default: |
1294 | BUG(); |
1295 | } |
1296 | break; |
1297 | default: |
1298 | BUG(); |
1299 | } |
1300 | |
1301 | return 0; |
1302 | } |
1303 | |
1304 | static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val) |
1305 | { |
1306 | struct blkio_group *blkg; |
1307 | struct hlist_node *n; |
1308 | struct blkio_policy_node *pn; |
1309 | |
1310 | if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX) |
1311 | return -EINVAL; |
1312 | |
1313 | spin_lock(&blkio_list_lock); |
1314 | spin_lock_irq(&blkcg->lock); |
1315 | blkcg->weight = (unsigned int)val; |
1316 | |
1317 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
1318 | pn = blkio_policy_search_node(blkcg, blkg->dev, |
1319 | BLKIO_POLICY_PROP, BLKIO_PROP_weight_device); |
1320 | if (pn) |
1321 | continue; |
1322 | |
1323 | blkio_update_group_weight(blkg, blkcg->weight); |
1324 | } |
1325 | spin_unlock_irq(&blkcg->lock); |
1326 | spin_unlock(&blkio_list_lock); |
1327 | return 0; |
1328 | } |
1329 | |
1330 | static u64 blkiocg_file_read_u64 (struct cgroup *cgrp, struct cftype *cft) { |
1331 | struct blkio_cgroup *blkcg; |
1332 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1333 | int name = BLKIOFILE_ATTR(cft->private); |
1334 | |
1335 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1336 | |
1337 | switch(plid) { |
1338 | case BLKIO_POLICY_PROP: |
1339 | switch(name) { |
1340 | case BLKIO_PROP_weight: |
1341 | return (u64)blkcg->weight; |
1342 | } |
1343 | break; |
1344 | default: |
1345 | BUG(); |
1346 | } |
1347 | return 0; |
1348 | } |
1349 | |
1350 | static int |
1351 | blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val) |
1352 | { |
1353 | struct blkio_cgroup *blkcg; |
1354 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
1355 | int name = BLKIOFILE_ATTR(cft->private); |
1356 | |
1357 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
1358 | |
1359 | switch(plid) { |
1360 | case BLKIO_POLICY_PROP: |
1361 | switch(name) { |
1362 | case BLKIO_PROP_weight: |
1363 | return blkio_weight_write(blkcg, val); |
1364 | } |
1365 | break; |
1366 | default: |
1367 | BUG(); |
1368 | } |
1369 | |
1370 | return 0; |
1371 | } |
1372 | |
1373 | struct cftype blkio_files[] = { |
1374 | { |
1375 | .name = "weight_device", |
1376 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1377 | BLKIO_PROP_weight_device), |
1378 | .read_seq_string = blkiocg_file_read, |
1379 | .write_string = blkiocg_file_write, |
1380 | .max_write_len = 256, |
1381 | }, |
1382 | { |
1383 | .name = "weight", |
1384 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1385 | BLKIO_PROP_weight), |
1386 | .read_u64 = blkiocg_file_read_u64, |
1387 | .write_u64 = blkiocg_file_write_u64, |
1388 | }, |
1389 | { |
1390 | .name = "time", |
1391 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1392 | BLKIO_PROP_time), |
1393 | .read_map = blkiocg_file_read_map, |
1394 | }, |
1395 | { |
1396 | .name = "sectors", |
1397 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1398 | BLKIO_PROP_sectors), |
1399 | .read_map = blkiocg_file_read_map, |
1400 | }, |
1401 | { |
1402 | .name = "io_service_bytes", |
1403 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1404 | BLKIO_PROP_io_service_bytes), |
1405 | .read_map = blkiocg_file_read_map, |
1406 | }, |
1407 | { |
1408 | .name = "io_serviced", |
1409 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1410 | BLKIO_PROP_io_serviced), |
1411 | .read_map = blkiocg_file_read_map, |
1412 | }, |
1413 | { |
1414 | .name = "io_service_time", |
1415 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1416 | BLKIO_PROP_io_service_time), |
1417 | .read_map = blkiocg_file_read_map, |
1418 | }, |
1419 | { |
1420 | .name = "io_wait_time", |
1421 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1422 | BLKIO_PROP_io_wait_time), |
1423 | .read_map = blkiocg_file_read_map, |
1424 | }, |
1425 | { |
1426 | .name = "io_merged", |
1427 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1428 | BLKIO_PROP_io_merged), |
1429 | .read_map = blkiocg_file_read_map, |
1430 | }, |
1431 | { |
1432 | .name = "io_queued", |
1433 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1434 | BLKIO_PROP_io_queued), |
1435 | .read_map = blkiocg_file_read_map, |
1436 | }, |
1437 | { |
1438 | .name = "reset_stats", |
1439 | .write_u64 = blkiocg_reset_stats, |
1440 | }, |
1441 | #ifdef CONFIG_BLK_DEV_THROTTLING |
1442 | { |
1443 | .name = "throttle.read_bps_device", |
1444 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1445 | BLKIO_THROTL_read_bps_device), |
1446 | .read_seq_string = blkiocg_file_read, |
1447 | .write_string = blkiocg_file_write, |
1448 | .max_write_len = 256, |
1449 | }, |
1450 | |
1451 | { |
1452 | .name = "throttle.write_bps_device", |
1453 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1454 | BLKIO_THROTL_write_bps_device), |
1455 | .read_seq_string = blkiocg_file_read, |
1456 | .write_string = blkiocg_file_write, |
1457 | .max_write_len = 256, |
1458 | }, |
1459 | |
1460 | { |
1461 | .name = "throttle.read_iops_device", |
1462 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1463 | BLKIO_THROTL_read_iops_device), |
1464 | .read_seq_string = blkiocg_file_read, |
1465 | .write_string = blkiocg_file_write, |
1466 | .max_write_len = 256, |
1467 | }, |
1468 | |
1469 | { |
1470 | .name = "throttle.write_iops_device", |
1471 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1472 | BLKIO_THROTL_write_iops_device), |
1473 | .read_seq_string = blkiocg_file_read, |
1474 | .write_string = blkiocg_file_write, |
1475 | .max_write_len = 256, |
1476 | }, |
1477 | { |
1478 | .name = "throttle.io_service_bytes", |
1479 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1480 | BLKIO_THROTL_io_service_bytes), |
1481 | .read_map = blkiocg_file_read_map, |
1482 | }, |
1483 | { |
1484 | .name = "throttle.io_serviced", |
1485 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
1486 | BLKIO_THROTL_io_serviced), |
1487 | .read_map = blkiocg_file_read_map, |
1488 | }, |
1489 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
1490 | |
1491 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
1492 | { |
1493 | .name = "avg_queue_size", |
1494 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1495 | BLKIO_PROP_avg_queue_size), |
1496 | .read_map = blkiocg_file_read_map, |
1497 | }, |
1498 | { |
1499 | .name = "group_wait_time", |
1500 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1501 | BLKIO_PROP_group_wait_time), |
1502 | .read_map = blkiocg_file_read_map, |
1503 | }, |
1504 | { |
1505 | .name = "idle_time", |
1506 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1507 | BLKIO_PROP_idle_time), |
1508 | .read_map = blkiocg_file_read_map, |
1509 | }, |
1510 | { |
1511 | .name = "empty_time", |
1512 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1513 | BLKIO_PROP_empty_time), |
1514 | .read_map = blkiocg_file_read_map, |
1515 | }, |
1516 | { |
1517 | .name = "dequeue", |
1518 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1519 | BLKIO_PROP_dequeue), |
1520 | .read_map = blkiocg_file_read_map, |
1521 | }, |
1522 | { |
1523 | .name = "unaccounted_time", |
1524 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
1525 | BLKIO_PROP_unaccounted_time), |
1526 | .read_map = blkiocg_file_read_map, |
1527 | }, |
1528 | #endif |
1529 | }; |
1530 | |
1531 | static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
1532 | { |
1533 | return cgroup_add_files(cgroup, subsys, blkio_files, |
1534 | ARRAY_SIZE(blkio_files)); |
1535 | } |
1536 | |
1537 | static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
1538 | { |
1539 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); |
1540 | unsigned long flags; |
1541 | struct blkio_group *blkg; |
1542 | void *key; |
1543 | struct blkio_policy_type *blkiop; |
1544 | struct blkio_policy_node *pn, *pntmp; |
1545 | |
1546 | rcu_read_lock(); |
1547 | do { |
1548 | spin_lock_irqsave(&blkcg->lock, flags); |
1549 | |
1550 | if (hlist_empty(&blkcg->blkg_list)) { |
1551 | spin_unlock_irqrestore(&blkcg->lock, flags); |
1552 | break; |
1553 | } |
1554 | |
1555 | blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group, |
1556 | blkcg_node); |
1557 | key = rcu_dereference(blkg->key); |
1558 | __blkiocg_del_blkio_group(blkg); |
1559 | |
1560 | spin_unlock_irqrestore(&blkcg->lock, flags); |
1561 | |
1562 | /* |
1563 | * This blkio_group is being unlinked as associated cgroup is |
1564 | * going away. Let all the IO controlling policies know about |
1565 | * this event. |
1566 | */ |
1567 | spin_lock(&blkio_list_lock); |
1568 | list_for_each_entry(blkiop, &blkio_list, list) { |
1569 | if (blkiop->plid != blkg->plid) |
1570 | continue; |
1571 | blkiop->ops.blkio_unlink_group_fn(key, blkg); |
1572 | } |
1573 | spin_unlock(&blkio_list_lock); |
1574 | } while (1); |
1575 | |
1576 | list_for_each_entry_safe(pn, pntmp, &blkcg->policy_list, node) { |
1577 | blkio_policy_delete_node(pn); |
1578 | kfree(pn); |
1579 | } |
1580 | |
1581 | free_css_id(&blkio_subsys, &blkcg->css); |
1582 | rcu_read_unlock(); |
1583 | if (blkcg != &blkio_root_cgroup) |
1584 | kfree(blkcg); |
1585 | } |
1586 | |
1587 | static struct cgroup_subsys_state * |
1588 | blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
1589 | { |
1590 | struct blkio_cgroup *blkcg; |
1591 | struct cgroup *parent = cgroup->parent; |
1592 | |
1593 | if (!parent) { |
1594 | blkcg = &blkio_root_cgroup; |
1595 | goto done; |
1596 | } |
1597 | |
1598 | blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL); |
1599 | if (!blkcg) |
1600 | return ERR_PTR(-ENOMEM); |
1601 | |
1602 | blkcg->weight = BLKIO_WEIGHT_DEFAULT; |
1603 | done: |
1604 | spin_lock_init(&blkcg->lock); |
1605 | INIT_HLIST_HEAD(&blkcg->blkg_list); |
1606 | |
1607 | INIT_LIST_HEAD(&blkcg->policy_list); |
1608 | return &blkcg->css; |
1609 | } |
1610 | |
1611 | /* |
1612 | * We cannot support shared io contexts, as we have no mean to support |
1613 | * two tasks with the same ioc in two different groups without major rework |
1614 | * of the main cic data structures. For now we allow a task to change |
1615 | * its cgroup only if it's the only owner of its ioc. |
1616 | */ |
1617 | static int blkiocg_can_attach_task(struct cgroup *cgrp, struct task_struct *tsk) |
1618 | { |
1619 | struct io_context *ioc; |
1620 | int ret = 0; |
1621 | |
1622 | /* task_lock() is needed to avoid races with exit_io_context() */ |
1623 | task_lock(tsk); |
1624 | ioc = tsk->io_context; |
1625 | if (ioc && atomic_read(&ioc->nr_tasks) > 1) |
1626 | ret = -EINVAL; |
1627 | task_unlock(tsk); |
1628 | |
1629 | return ret; |
1630 | } |
1631 | |
1632 | static void blkiocg_attach_task(struct cgroup *cgrp, struct task_struct *tsk) |
1633 | { |
1634 | struct io_context *ioc; |
1635 | |
1636 | task_lock(tsk); |
1637 | ioc = tsk->io_context; |
1638 | if (ioc) |
1639 | ioc->cgroup_changed = 1; |
1640 | task_unlock(tsk); |
1641 | } |
1642 | |
1643 | void blkio_policy_register(struct blkio_policy_type *blkiop) |
1644 | { |
1645 | spin_lock(&blkio_list_lock); |
1646 | list_add_tail(&blkiop->list, &blkio_list); |
1647 | spin_unlock(&blkio_list_lock); |
1648 | } |
1649 | EXPORT_SYMBOL_GPL(blkio_policy_register); |
1650 | |
1651 | void blkio_policy_unregister(struct blkio_policy_type *blkiop) |
1652 | { |
1653 | spin_lock(&blkio_list_lock); |
1654 | list_del_init(&blkiop->list); |
1655 | spin_unlock(&blkio_list_lock); |
1656 | } |
1657 | EXPORT_SYMBOL_GPL(blkio_policy_unregister); |
1658 | |
1659 | static int __init init_cgroup_blkio(void) |
1660 | { |
1661 | return cgroup_load_subsys(&blkio_subsys); |
1662 | } |
1663 | |
1664 | static void __exit exit_cgroup_blkio(void) |
1665 | { |
1666 | cgroup_unload_subsys(&blkio_subsys); |
1667 | } |
1668 | |
1669 | module_init(init_cgroup_blkio); |
1670 | module_exit(exit_cgroup_blkio); |
1671 | MODULE_LICENSE("GPL"); |
1672 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9