Blame view
block/bfq-cgroup.c
39.7 KB
a497ee34a block: switch all... |
1 |
// SPDX-License-Identifier: GPL-2.0-or-later |
ea25da480 block, bfq: split... |
2 3 |
/* * cgroups support for the BFQ I/O scheduler. |
ea25da480 block, bfq: split... |
4 5 6 7 8 9 10 11 12 13 14 15 16 |
*/ #include <linux/module.h> #include <linux/slab.h> #include <linux/blkdev.h> #include <linux/cgroup.h> #include <linux/elevator.h> #include <linux/ktime.h> #include <linux/rbtree.h> #include <linux/ioprio.h> #include <linux/sbitmap.h> #include <linux/delay.h> #include "bfq-iosched.h" |
8060c47ba block: rename CON... |
17 |
#ifdef CONFIG_BFQ_CGROUP_DEBUG |
c0ce79dca blk-cgroup: move ... |
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 |
static int bfq_stat_init(struct bfq_stat *stat, gfp_t gfp) { int ret; ret = percpu_counter_init(&stat->cpu_cnt, 0, gfp); if (ret) return ret; atomic64_set(&stat->aux_cnt, 0); return 0; } static void bfq_stat_exit(struct bfq_stat *stat) { percpu_counter_destroy(&stat->cpu_cnt); } /** * bfq_stat_add - add a value to a bfq_stat * @stat: target bfq_stat * @val: value to add * * Add @val to @stat. The caller must ensure that IRQ on the same CPU * don't re-enter this function for the same counter. */ static inline void bfq_stat_add(struct bfq_stat *stat, uint64_t val) { percpu_counter_add_batch(&stat->cpu_cnt, val, BLKG_STAT_CPU_BATCH); } /** * bfq_stat_read - read the current value of a bfq_stat * @stat: bfq_stat to read */ static inline uint64_t bfq_stat_read(struct bfq_stat *stat) { return percpu_counter_sum_positive(&stat->cpu_cnt); } /** * bfq_stat_reset - reset a bfq_stat * @stat: bfq_stat to reset */ static inline void bfq_stat_reset(struct bfq_stat *stat) { percpu_counter_set(&stat->cpu_cnt, 0); atomic64_set(&stat->aux_cnt, 0); } /** * bfq_stat_add_aux - add a bfq_stat into another's aux count * @to: the destination bfq_stat * @from: the source * * Add @from's count including the aux one to @to's aux count. */ static inline void bfq_stat_add_aux(struct bfq_stat *to, struct bfq_stat *from) { atomic64_add(bfq_stat_read(from) + atomic64_read(&from->aux_cnt), &to->aux_cnt); } /** |
c0ce79dca blk-cgroup: move ... |
82 83 84 85 86 87 88 89 90 91 92 93 |
* blkg_prfill_stat - prfill callback for bfq_stat * @sf: seq_file to print to * @pd: policy private data of interest * @off: offset to the bfq_stat in @pd * * prfill callback for printing a bfq_stat. */ static u64 blkg_prfill_stat(struct seq_file *sf, struct blkg_policy_data *pd, int off) { return __blkg_prfill_u64(sf, pd, bfq_stat_read((void *)pd + off)); } |
ea25da480 block, bfq: split... |
94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 |
/* bfqg stats flags */ enum bfqg_stats_flags { BFQG_stats_waiting = 0, BFQG_stats_idling, BFQG_stats_empty, }; #define BFQG_FLAG_FNS(name) \ static void bfqg_stats_mark_##name(struct bfqg_stats *stats) \ { \ stats->flags |= (1 << BFQG_stats_##name); \ } \ static void bfqg_stats_clear_##name(struct bfqg_stats *stats) \ { \ stats->flags &= ~(1 << BFQG_stats_##name); \ } \ static int bfqg_stats_##name(struct bfqg_stats *stats) \ { \ return (stats->flags & (1 << BFQG_stats_##name)) != 0; \ } \ BFQG_FLAG_FNS(waiting) BFQG_FLAG_FNS(idling) BFQG_FLAG_FNS(empty) #undef BFQG_FLAG_FNS |
8f9bebc33 block, bfq: acces... |
119 |
/* This should be called with the scheduler lock held. */ |
ea25da480 block, bfq: split... |
120 121 |
static void bfqg_stats_update_group_wait_time(struct bfqg_stats *stats) { |
84c7afceb block: use ktime_... |
122 |
u64 now; |
ea25da480 block, bfq: split... |
123 124 125 |
if (!bfqg_stats_waiting(stats)) return; |
84c7afceb block: use ktime_... |
126 127 |
now = ktime_get_ns(); if (now > stats->start_group_wait_time) |
c0ce79dca blk-cgroup: move ... |
128 |
bfq_stat_add(&stats->group_wait_time, |
ea25da480 block, bfq: split... |
129 130 131 |
now - stats->start_group_wait_time); bfqg_stats_clear_waiting(stats); } |
8f9bebc33 block, bfq: acces... |
132 |
/* This should be called with the scheduler lock held. */ |
ea25da480 block, bfq: split... |
133 134 135 136 137 138 139 140 141 |
static void bfqg_stats_set_start_group_wait_time(struct bfq_group *bfqg, struct bfq_group *curr_bfqg) { struct bfqg_stats *stats = &bfqg->stats; if (bfqg_stats_waiting(stats)) return; if (bfqg == curr_bfqg) return; |
84c7afceb block: use ktime_... |
142 |
stats->start_group_wait_time = ktime_get_ns(); |
ea25da480 block, bfq: split... |
143 144 |
bfqg_stats_mark_waiting(stats); } |
8f9bebc33 block, bfq: acces... |
145 |
/* This should be called with the scheduler lock held. */ |
ea25da480 block, bfq: split... |
146 147 |
static void bfqg_stats_end_empty_time(struct bfqg_stats *stats) { |
84c7afceb block: use ktime_... |
148 |
u64 now; |
ea25da480 block, bfq: split... |
149 150 151 |
if (!bfqg_stats_empty(stats)) return; |
84c7afceb block: use ktime_... |
152 153 |
now = ktime_get_ns(); if (now > stats->start_empty_time) |
c0ce79dca blk-cgroup: move ... |
154 |
bfq_stat_add(&stats->empty_time, |
ea25da480 block, bfq: split... |
155 156 157 158 159 160 |
now - stats->start_empty_time); bfqg_stats_clear_empty(stats); } void bfqg_stats_update_dequeue(struct bfq_group *bfqg) { |
c0ce79dca blk-cgroup: move ... |
161 |
bfq_stat_add(&bfqg->stats.dequeue, 1); |
ea25da480 block, bfq: split... |
162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 |
} void bfqg_stats_set_start_empty_time(struct bfq_group *bfqg) { struct bfqg_stats *stats = &bfqg->stats; if (blkg_rwstat_total(&stats->queued)) return; /* * group is already marked empty. This can happen if bfqq got new * request in parent group and moved to this group while being added * to service tree. Just ignore the event and move on. */ if (bfqg_stats_empty(stats)) return; |
84c7afceb block: use ktime_... |
178 |
stats->start_empty_time = ktime_get_ns(); |
ea25da480 block, bfq: split... |
179 180 181 182 183 184 185 186 |
bfqg_stats_mark_empty(stats); } void bfqg_stats_update_idle_time(struct bfq_group *bfqg) { struct bfqg_stats *stats = &bfqg->stats; if (bfqg_stats_idling(stats)) { |
84c7afceb block: use ktime_... |
187 |
u64 now = ktime_get_ns(); |
ea25da480 block, bfq: split... |
188 |
|
84c7afceb block: use ktime_... |
189 |
if (now > stats->start_idle_time) |
c0ce79dca blk-cgroup: move ... |
190 |
bfq_stat_add(&stats->idle_time, |
ea25da480 block, bfq: split... |
191 192 193 194 195 196 197 198 |
now - stats->start_idle_time); bfqg_stats_clear_idling(stats); } } void bfqg_stats_set_start_idle_time(struct bfq_group *bfqg) { struct bfqg_stats *stats = &bfqg->stats; |
84c7afceb block: use ktime_... |
199 |
stats->start_idle_time = ktime_get_ns(); |
ea25da480 block, bfq: split... |
200 201 202 203 204 205 |
bfqg_stats_mark_idling(stats); } void bfqg_stats_update_avg_queue_size(struct bfq_group *bfqg) { struct bfqg_stats *stats = &bfqg->stats; |
c0ce79dca blk-cgroup: move ... |
206 |
bfq_stat_add(&stats->avg_queue_size_sum, |
ea25da480 block, bfq: split... |
207 |
blkg_rwstat_total(&stats->queued)); |
c0ce79dca blk-cgroup: move ... |
208 |
bfq_stat_add(&stats->avg_queue_size_samples, 1); |
ea25da480 block, bfq: split... |
209 210 |
bfqg_stats_update_group_wait_time(stats); } |
a33801e8b block, bfq: move ... |
211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 |
void bfqg_stats_update_io_add(struct bfq_group *bfqg, struct bfq_queue *bfqq, unsigned int op) { blkg_rwstat_add(&bfqg->stats.queued, op, 1); bfqg_stats_end_empty_time(&bfqg->stats); if (!(bfqq == ((struct bfq_data *)bfqg->bfqd)->in_service_queue)) bfqg_stats_set_start_group_wait_time(bfqg, bfqq_group(bfqq)); } void bfqg_stats_update_io_remove(struct bfq_group *bfqg, unsigned int op) { blkg_rwstat_add(&bfqg->stats.queued, op, -1); } void bfqg_stats_update_io_merged(struct bfq_group *bfqg, unsigned int op) { blkg_rwstat_add(&bfqg->stats.merged, op, 1); } |
84c7afceb block: use ktime_... |
229 230 |
void bfqg_stats_update_completion(struct bfq_group *bfqg, u64 start_time_ns, u64 io_start_time_ns, unsigned int op) |
a33801e8b block, bfq: move ... |
231 232 |
{ struct bfqg_stats *stats = &bfqg->stats; |
84c7afceb block: use ktime_... |
233 |
u64 now = ktime_get_ns(); |
a33801e8b block, bfq: move ... |
234 |
|
84c7afceb block: use ktime_... |
235 |
if (now > io_start_time_ns) |
a33801e8b block, bfq: move ... |
236 |
blkg_rwstat_add(&stats->service_time, op, |
84c7afceb block: use ktime_... |
237 238 |
now - io_start_time_ns); if (io_start_time_ns > start_time_ns) |
a33801e8b block, bfq: move ... |
239 |
blkg_rwstat_add(&stats->wait_time, op, |
84c7afceb block: use ktime_... |
240 |
io_start_time_ns - start_time_ns); |
a33801e8b block, bfq: move ... |
241 |
} |
8060c47ba block: rename CON... |
242 |
#else /* CONFIG_BFQ_CGROUP_DEBUG */ |
a33801e8b block, bfq: move ... |
243 244 245 246 247 |
void bfqg_stats_update_io_add(struct bfq_group *bfqg, struct bfq_queue *bfqq, unsigned int op) { } void bfqg_stats_update_io_remove(struct bfq_group *bfqg, unsigned int op) { } void bfqg_stats_update_io_merged(struct bfq_group *bfqg, unsigned int op) { } |
84c7afceb block: use ktime_... |
248 249 |
void bfqg_stats_update_completion(struct bfq_group *bfqg, u64 start_time_ns, u64 io_start_time_ns, unsigned int op) { } |
a33801e8b block, bfq: move ... |
250 251 252 253 254 |
void bfqg_stats_update_dequeue(struct bfq_group *bfqg) { } void bfqg_stats_set_start_empty_time(struct bfq_group *bfqg) { } void bfqg_stats_update_idle_time(struct bfq_group *bfqg) { } void bfqg_stats_set_start_idle_time(struct bfq_group *bfqg) { } void bfqg_stats_update_avg_queue_size(struct bfq_group *bfqg) { } |
8060c47ba block: rename CON... |
255 |
#endif /* CONFIG_BFQ_CGROUP_DEBUG */ |
a33801e8b block, bfq: move ... |
256 257 |
#ifdef CONFIG_BFQ_GROUP_IOSCHED |
ea25da480 block, bfq: split... |
258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 |
/* * blk-cgroup policy-related handlers * The following functions help in converting between blk-cgroup * internal structures and BFQ-specific structures. */ static struct bfq_group *pd_to_bfqg(struct blkg_policy_data *pd) { return pd ? container_of(pd, struct bfq_group, pd) : NULL; } struct blkcg_gq *bfqg_to_blkg(struct bfq_group *bfqg) { return pd_to_blkg(&bfqg->pd); } static struct bfq_group *blkg_to_bfqg(struct blkcg_gq *blkg) { return pd_to_bfqg(blkg_to_pd(blkg, &blkcg_policy_bfq)); } /* * bfq_group handlers * The following functions help in navigating the bfq_group hierarchy * by allowing to find the parent of a bfq_group or the bfq_group * associated to a bfq_queue. */ static struct bfq_group *bfqg_parent(struct bfq_group *bfqg) { struct blkcg_gq *pblkg = bfqg_to_blkg(bfqg)->parent; return pblkg ? blkg_to_bfqg(pblkg) : NULL; } struct bfq_group *bfqq_group(struct bfq_queue *bfqq) { struct bfq_entity *group_entity = bfqq->entity.parent; return group_entity ? container_of(group_entity, struct bfq_group, entity) : bfqq->bfqd->root_group; } /* * The following two functions handle get and put of a bfq_group by * wrapping the related blk-cgroup hooks. */ static void bfqg_get(struct bfq_group *bfqg) { |
8f9bebc33 block, bfq: acces... |
309 |
bfqg->ref++; |
ea25da480 block, bfq: split... |
310 |
} |
dfb79af54 bfq: Declare loca... |
311 |
static void bfqg_put(struct bfq_group *bfqg) |
ea25da480 block, bfq: split... |
312 |
{ |
8f9bebc33 block, bfq: acces... |
313 314 315 316 317 |
bfqg->ref--; if (bfqg->ref == 0) kfree(bfqg); } |
2de791ab4 bfq: fix blkio cg... |
318 |
static void bfqg_and_blkg_get(struct bfq_group *bfqg) |
8f9bebc33 block, bfq: acces... |
319 320 321 322 323 324 325 326 327 |
{ /* see comments in bfq_bic_update_cgroup for why refcounting bfqg */ bfqg_get(bfqg); blkg_get(bfqg_to_blkg(bfqg)); } void bfqg_and_blkg_put(struct bfq_group *bfqg) { |
8f9bebc33 block, bfq: acces... |
328 |
blkg_put(bfqg_to_blkg(bfqg)); |
d5274b3cd block: bfq: swap ... |
329 330 |
bfqg_put(bfqg); |
ea25da480 block, bfq: split... |
331 |
} |
fd41e6033 bfq-iosched: stop... |
332 333 334 |
void bfqg_stats_update_legacy_io(struct request_queue *q, struct request *rq) { struct bfq_group *bfqg = blkg_to_bfqg(rq->bio->bi_blkg); |
08802ed66 bfq-iosched: Ensu... |
335 336 |
if (!bfqg) return; |
fd41e6033 bfq-iosched: stop... |
337 338 339 |
blkg_rwstat_add(&bfqg->stats.bytes, rq->cmd_flags, blk_rq_bytes(rq)); blkg_rwstat_add(&bfqg->stats.ios, rq->cmd_flags, 1); } |
ea25da480 block, bfq: split... |
340 341 342 |
/* @stats = 0 */ static void bfqg_stats_reset(struct bfqg_stats *stats) { |
8060c47ba block: rename CON... |
343 |
#ifdef CONFIG_BFQ_CGROUP_DEBUG |
ea25da480 block, bfq: split... |
344 345 346 347 |
/* queued stats shouldn't be cleared */ blkg_rwstat_reset(&stats->merged); blkg_rwstat_reset(&stats->service_time); blkg_rwstat_reset(&stats->wait_time); |
c0ce79dca blk-cgroup: move ... |
348 349 350 351 352 353 354 |
bfq_stat_reset(&stats->time); bfq_stat_reset(&stats->avg_queue_size_sum); bfq_stat_reset(&stats->avg_queue_size_samples); bfq_stat_reset(&stats->dequeue); bfq_stat_reset(&stats->group_wait_time); bfq_stat_reset(&stats->idle_time); bfq_stat_reset(&stats->empty_time); |
a33801e8b block, bfq: move ... |
355 |
#endif |
ea25da480 block, bfq: split... |
356 357 358 359 360 361 362 |
} /* @to += @from */ static void bfqg_stats_add_aux(struct bfqg_stats *to, struct bfqg_stats *from) { if (!to || !from) return; |
8060c47ba block: rename CON... |
363 |
#ifdef CONFIG_BFQ_CGROUP_DEBUG |
ea25da480 block, bfq: split... |
364 365 366 367 |
/* queued stats shouldn't be cleared */ blkg_rwstat_add_aux(&to->merged, &from->merged); blkg_rwstat_add_aux(&to->service_time, &from->service_time); blkg_rwstat_add_aux(&to->wait_time, &from->wait_time); |
c0ce79dca blk-cgroup: move ... |
368 369 370 |
bfq_stat_add_aux(&from->time, &from->time); bfq_stat_add_aux(&to->avg_queue_size_sum, &from->avg_queue_size_sum); bfq_stat_add_aux(&to->avg_queue_size_samples, |
ea25da480 block, bfq: split... |
371 |
&from->avg_queue_size_samples); |
c0ce79dca blk-cgroup: move ... |
372 373 374 375 |
bfq_stat_add_aux(&to->dequeue, &from->dequeue); bfq_stat_add_aux(&to->group_wait_time, &from->group_wait_time); bfq_stat_add_aux(&to->idle_time, &from->idle_time); bfq_stat_add_aux(&to->empty_time, &from->empty_time); |
a33801e8b block, bfq: move ... |
376 |
#endif |
ea25da480 block, bfq: split... |
377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 |
} /* * Transfer @bfqg's stats to its parent's aux counts so that the ancestors' * recursive stats can still account for the amount used by this bfqg after * it's gone. */ static void bfqg_stats_xfer_dead(struct bfq_group *bfqg) { struct bfq_group *parent; if (!bfqg) /* root_group */ return; parent = bfqg_parent(bfqg); |
0d945c1f9 block: remove the... |
392 |
lockdep_assert_held(&bfqg_to_blkg(bfqg)->q->queue_lock); |
ea25da480 block, bfq: split... |
393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 |
if (unlikely(!parent)) return; bfqg_stats_add_aux(&parent->stats, &bfqg->stats); bfqg_stats_reset(&bfqg->stats); } void bfq_init_entity(struct bfq_entity *entity, struct bfq_group *bfqg) { struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); entity->weight = entity->new_weight; entity->orig_weight = entity->new_weight; if (bfqq) { bfqq->ioprio = bfqq->new_ioprio; bfqq->ioprio_class = bfqq->new_ioprio_class; |
8f9bebc33 block, bfq: acces... |
410 411 412 413 414 |
/* * Make sure that bfqg and its associated blkg do not * disappear before entity. */ bfqg_and_blkg_get(bfqg); |
ea25da480 block, bfq: split... |
415 416 417 418 419 420 421 |
} entity->parent = bfqg->my_entity; /* NULL for root group */ entity->sched_data = &bfqg->sched_data; } static void bfqg_stats_exit(struct bfqg_stats *stats) { |
fd41e6033 bfq-iosched: stop... |
422 423 |
blkg_rwstat_exit(&stats->bytes); blkg_rwstat_exit(&stats->ios); |
8060c47ba block: rename CON... |
424 |
#ifdef CONFIG_BFQ_CGROUP_DEBUG |
ea25da480 block, bfq: split... |
425 426 427 428 |
blkg_rwstat_exit(&stats->merged); blkg_rwstat_exit(&stats->service_time); blkg_rwstat_exit(&stats->wait_time); blkg_rwstat_exit(&stats->queued); |
c0ce79dca blk-cgroup: move ... |
429 430 431 432 433 434 435 |
bfq_stat_exit(&stats->time); bfq_stat_exit(&stats->avg_queue_size_sum); bfq_stat_exit(&stats->avg_queue_size_samples); bfq_stat_exit(&stats->dequeue); bfq_stat_exit(&stats->group_wait_time); bfq_stat_exit(&stats->idle_time); bfq_stat_exit(&stats->empty_time); |
a33801e8b block, bfq: move ... |
436 |
#endif |
ea25da480 block, bfq: split... |
437 438 439 440 |
} static int bfqg_stats_init(struct bfqg_stats *stats, gfp_t gfp) { |
fd41e6033 bfq-iosched: stop... |
441 442 443 |
if (blkg_rwstat_init(&stats->bytes, gfp) || blkg_rwstat_init(&stats->ios, gfp)) return -ENOMEM; |
8060c47ba block: rename CON... |
444 |
#ifdef CONFIG_BFQ_CGROUP_DEBUG |
ea25da480 block, bfq: split... |
445 446 447 448 |
if (blkg_rwstat_init(&stats->merged, gfp) || blkg_rwstat_init(&stats->service_time, gfp) || blkg_rwstat_init(&stats->wait_time, gfp) || blkg_rwstat_init(&stats->queued, gfp) || |
c0ce79dca blk-cgroup: move ... |
449 450 451 452 453 454 455 |
bfq_stat_init(&stats->time, gfp) || bfq_stat_init(&stats->avg_queue_size_sum, gfp) || bfq_stat_init(&stats->avg_queue_size_samples, gfp) || bfq_stat_init(&stats->dequeue, gfp) || bfq_stat_init(&stats->group_wait_time, gfp) || bfq_stat_init(&stats->idle_time, gfp) || bfq_stat_init(&stats->empty_time, gfp)) { |
ea25da480 block, bfq: split... |
456 457 458 |
bfqg_stats_exit(stats); return -ENOMEM; } |
a33801e8b block, bfq: move ... |
459 |
#endif |
ea25da480 block, bfq: split... |
460 461 462 463 464 465 466 467 468 469 470 471 472 |
return 0; } static struct bfq_group_data *cpd_to_bfqgd(struct blkcg_policy_data *cpd) { return cpd ? container_of(cpd, struct bfq_group_data, pd) : NULL; } static struct bfq_group_data *blkcg_to_bfqgd(struct blkcg *blkcg) { return cpd_to_bfqgd(blkcg_to_cpd(blkcg, &blkcg_policy_bfq)); } |
dfb79af54 bfq: Declare loca... |
473 |
static struct blkcg_policy_data *bfq_cpd_alloc(gfp_t gfp) |
ea25da480 block, bfq: split... |
474 475 476 477 478 479 480 481 |
{ struct bfq_group_data *bgd; bgd = kzalloc(sizeof(*bgd), gfp); if (!bgd) return NULL; return &bgd->pd; } |
dfb79af54 bfq: Declare loca... |
482 |
static void bfq_cpd_init(struct blkcg_policy_data *cpd) |
ea25da480 block, bfq: split... |
483 484 485 486 487 488 |
{ struct bfq_group_data *d = cpd_to_bfqgd(cpd); d->weight = cgroup_subsys_on_dfl(io_cgrp_subsys) ? CGROUP_WEIGHT_DFL : BFQ_WEIGHT_LEGACY_DFL; } |
dfb79af54 bfq: Declare loca... |
489 |
static void bfq_cpd_free(struct blkcg_policy_data *cpd) |
ea25da480 block, bfq: split... |
490 491 492 |
{ kfree(cpd_to_bfqgd(cpd)); } |
cf09a8ee1 blkcg: pass @q an... |
493 494 |
static struct blkg_policy_data *bfq_pd_alloc(gfp_t gfp, struct request_queue *q, struct blkcg *blkcg) |
ea25da480 block, bfq: split... |
495 496 |
{ struct bfq_group *bfqg; |
cf09a8ee1 blkcg: pass @q an... |
497 |
bfqg = kzalloc_node(sizeof(*bfqg), gfp, q->node); |
ea25da480 block, bfq: split... |
498 499 500 501 502 503 504 |
if (!bfqg) return NULL; if (bfqg_stats_init(&bfqg->stats, gfp)) { kfree(bfqg); return NULL; } |
8f9bebc33 block, bfq: acces... |
505 506 |
/* see comments in bfq_bic_update_cgroup for why refcounting */ bfqg_get(bfqg); |
ea25da480 block, bfq: split... |
507 508 |
return &bfqg->pd; } |
dfb79af54 bfq: Declare loca... |
509 |
static void bfq_pd_init(struct blkg_policy_data *pd) |
ea25da480 block, bfq: split... |
510 511 512 513 514 515 516 517 518 |
{ struct blkcg_gq *blkg = pd_to_blkg(pd); struct bfq_group *bfqg = blkg_to_bfqg(blkg); struct bfq_data *bfqd = blkg->q->elevator->elevator_data; struct bfq_entity *entity = &bfqg->entity; struct bfq_group_data *d = blkcg_to_bfqgd(blkg->blkcg); entity->orig_weight = entity->weight = entity->new_weight = d->weight; entity->my_sched_data = &bfqg->sched_data; |
430a67f9d block, bfq: merge... |
519 |
entity->last_bfqq_created = NULL; |
ea25da480 block, bfq: split... |
520 521 522 523 524 525 |
bfqg->my_entity = entity; /* * the root_group's will be set to NULL * in bfq_init_queue() */ bfqg->bfqd = bfqd; bfqg->active_entities = 0; |
54c08ef2d bfq: Track whethe... |
526 |
bfqg->online = true; |
ea25da480 block, bfq: split... |
527 528 |
bfqg->rq_pos_tree = RB_ROOT; } |
dfb79af54 bfq: Declare loca... |
529 |
static void bfq_pd_free(struct blkg_policy_data *pd) |
ea25da480 block, bfq: split... |
530 531 532 533 |
{ struct bfq_group *bfqg = pd_to_bfqg(pd); bfqg_stats_exit(&bfqg->stats); |
8f9bebc33 block, bfq: acces... |
534 |
bfqg_put(bfqg); |
ea25da480 block, bfq: split... |
535 |
} |
dfb79af54 bfq: Declare loca... |
536 |
static void bfq_pd_reset_stats(struct blkg_policy_data *pd) |
ea25da480 block, bfq: split... |
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 |
{ struct bfq_group *bfqg = pd_to_bfqg(pd); bfqg_stats_reset(&bfqg->stats); } static void bfq_group_set_parent(struct bfq_group *bfqg, struct bfq_group *parent) { struct bfq_entity *entity; entity = &bfqg->entity; entity->parent = parent->my_entity; entity->sched_data = &parent->sched_data; } |
86defc542 bfq: Get rid of _... |
552 |
static void bfq_link_bfqg(struct bfq_data *bfqd, struct bfq_group *bfqg) |
ea25da480 block, bfq: split... |
553 |
{ |
86defc542 bfq: Get rid of _... |
554 |
struct bfq_group *parent; |
ea25da480 block, bfq: split... |
555 |
struct bfq_entity *entity; |
ea25da480 block, bfq: split... |
556 557 558 559 560 561 562 |
/* * Update chain of bfq_groups as we might be handling a leaf group * which, along with some of its relatives, has not been hooked yet * to the private hierarchy of BFQ. */ entity = &bfqg->entity; for_each_entity(entity) { |
14afc5936 block, bfq: fix o... |
563 564 565 566 |
struct bfq_group *curr_bfqg = container_of(entity, struct bfq_group, entity); if (curr_bfqg != bfqd->root_group) { parent = bfqg_parent(curr_bfqg); |
ea25da480 block, bfq: split... |
567 568 |
if (!parent) parent = bfqd->root_group; |
14afc5936 block, bfq: fix o... |
569 |
bfq_group_set_parent(curr_bfqg, parent); |
ea25da480 block, bfq: split... |
570 571 |
} } |
86defc542 bfq: Get rid of _... |
572 |
} |
ea25da480 block, bfq: split... |
573 |
|
86defc542 bfq: Get rid of _... |
574 575 576 |
struct bfq_group *bfq_bio_bfqg(struct bfq_data *bfqd, struct bio *bio) { struct blkcg_gq *blkg = bio->bi_blkg; |
6ee0868b0 bfq: Make sure bf... |
577 |
struct bfq_group *bfqg; |
86defc542 bfq: Get rid of _... |
578 |
|
6ee0868b0 bfq: Make sure bf... |
579 580 581 582 583 584 585 586 587 588 589 |
while (blkg) { bfqg = blkg_to_bfqg(blkg); if (bfqg->online) { bio_associate_blkg_from_css(bio, &blkg->blkcg->css); return bfqg; } blkg = blkg->parent; } bio_associate_blkg_from_css(bio, &bfqg_to_blkg(bfqd->root_group)->blkcg->css); return bfqd->root_group; |
ea25da480 block, bfq: split... |
590 591 592 593 594 595 596 597 598 599 600 |
} /** * bfq_bfqq_move - migrate @bfqq to @bfqg. * @bfqd: queue descriptor. * @bfqq: the queue to move. * @bfqg: the group to move to. * * Move @bfqq to @bfqg, deactivating it from its old group and reactivating * it on the new one. Avoid putting the entity on the old group idle tree. * |
8f9bebc33 block, bfq: acces... |
601 602 603 604 |
* Must be called under the scheduler lock, to make sure that the blkg * owning @bfqg does not disappear (see comments in * bfq_bic_update_cgroup on guaranteeing the consistency of blkg * objects). |
ea25da480 block, bfq: split... |
605 606 607 608 609 |
*/ void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq, struct bfq_group *bfqg) { struct bfq_entity *entity = &bfqq->entity; |
fd1bb3ae5 block, bfq: move ... |
610 |
/* |
8f34dea99 block, bfq: don't... |
611 612 613 614 615 616 |
* oom_bfqq is not allowed to move, oom_bfqq will hold ref to root_group * until elevator exit. */ if (bfqq == &bfqd->oom_bfqq) return; /* |
fd1bb3ae5 block, bfq: move ... |
617 618 619 620 |
* Get extra reference to prevent bfqq from being freed in * next possible expire or deactivate. */ bfqq->ref++; |
ea25da480 block, bfq: split... |
621 622 623 624 625 626 627 628 629 630 631 632 |
/* If bfqq is empty, then bfq_bfqq_expire also invokes * bfq_del_bfqq_busy, thereby removing bfqq and its entity * from data structures related to current group. Otherwise we * need to remove bfqq explicitly with bfq_deactivate_bfqq, as * we do below. */ if (bfqq == bfqd->in_service_queue) bfq_bfqq_expire(bfqd, bfqd->in_service_queue, false, BFQQE_PREEMPTED); if (bfq_bfqq_busy(bfqq)) bfq_deactivate_bfqq(bfqd, bfqq, false, false); |
33a16a980 block, bfq: exten... |
633 |
else if (entity->on_st_or_in_serv) |
ea25da480 block, bfq: split... |
634 |
bfq_put_idle_entity(bfq_entity_service_tree(entity), entity); |
8f9bebc33 block, bfq: acces... |
635 |
bfqg_and_blkg_put(bfqq_group(bfqq)); |
ea25da480 block, bfq: split... |
636 |
|
d29bd4142 block, bfq: reset... |
637 638 639 640 641 |
if (entity->parent && entity->parent->last_bfqq_created == bfqq) entity->parent->last_bfqq_created = NULL; else if (bfqd->last_bfqq_created == bfqq) bfqd->last_bfqq_created = NULL; |
ea25da480 block, bfq: split... |
642 643 |
entity->parent = bfqg->my_entity; entity->sched_data = &bfqg->sched_data; |
8f9bebc33 block, bfq: acces... |
644 645 |
/* pin down bfqg and its associated blkg */ bfqg_and_blkg_get(bfqg); |
ea25da480 block, bfq: split... |
646 647 |
if (bfq_bfqq_busy(bfqq)) { |
8cacc5ab3 block, bfq: do no... |
648 649 |
if (unlikely(!bfqd->nonrot_with_queueing)) bfq_pos_tree_add_move(bfqd, bfqq); |
ea25da480 block, bfq: split... |
650 651 652 653 654 |
bfq_activate_bfqq(bfqd, bfqq); } if (!bfqd->in_service_queue && !bfqd->rq_in_driver) bfq_schedule_dispatch(bfqd); |
fd1bb3ae5 block, bfq: move ... |
655 |
/* release extra ref taken above, bfqq may happen to be freed now */ |
ecedd3d7e block, bfq: get e... |
656 |
bfq_put_queue(bfqq); |
ea25da480 block, bfq: split... |
657 658 659 660 661 662 663 664 |
} /** * __bfq_bic_change_cgroup - move @bic to @cgroup. * @bfqd: the queue descriptor. * @bic: the bic to move. * @blkcg: the blk-cgroup to move to. * |
8f9bebc33 block, bfq: acces... |
665 666 667 |
* Move bic to blkcg, assuming that bfqd->lock is held; which makes * sure that the reference to cgroup is valid across the call (see * comments in bfq_bic_update_cgroup on this issue) |
ea25da480 block, bfq: split... |
668 |
*/ |
86defc542 bfq: Get rid of _... |
669 670 671 |
static void *__bfq_bic_change_cgroup(struct bfq_data *bfqd, struct bfq_io_cq *bic, struct bfq_group *bfqg) |
ea25da480 block, bfq: split... |
672 673 674 |
{ struct bfq_queue *async_bfqq = bic_to_bfqq(bic, 0); struct bfq_queue *sync_bfqq = bic_to_bfqq(bic, 1); |
ea25da480 block, bfq: split... |
675 |
struct bfq_entity *entity; |
ea25da480 block, bfq: split... |
676 677 678 679 680 |
if (async_bfqq) { entity = &async_bfqq->entity; if (entity->sched_data != &bfqg->sched_data) { bic_set_bfqq(bic, NULL, 0); |
c89977366 block, bfq: turn ... |
681 |
bfq_release_process_ref(bfqd, async_bfqq); |
ea25da480 block, bfq: split... |
682 683 684 685 |
} } if (sync_bfqq) { |
81b7d0c71 bfq: Split shared... |
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 |
if (!sync_bfqq->new_bfqq && !bfq_bfqq_coop(sync_bfqq)) { /* We are the only user of this bfqq, just move it */ if (sync_bfqq->entity.sched_data != &bfqg->sched_data) bfq_bfqq_move(bfqd, sync_bfqq, bfqg); } else { struct bfq_queue *bfqq; /* * The queue was merged to a different queue. Check * that the merge chain still belongs to the same * cgroup. */ for (bfqq = sync_bfqq; bfqq; bfqq = bfqq->new_bfqq) if (bfqq->entity.sched_data != &bfqg->sched_data) break; if (bfqq) { /* * Some queue changed cgroup so the merge is * not valid anymore. We cannot easily just * cancel the merge (by clearing new_bfqq) as * there may be other processes using this * queue and holding refs to all queues below * sync_bfqq->new_bfqq. Similarly if the merge * already happened, we need to detach from * bfqq now so that we cannot merge bio to a * request from the old cgroup. */ bfq_put_cooperator(sync_bfqq); bfq_release_process_ref(bfqd, sync_bfqq); bic_set_bfqq(bic, NULL, 1); } } |
ea25da480 block, bfq: split... |
719 720 721 722 723 724 725 726 |
} return bfqg; } void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio) { struct bfq_data *bfqd = bic_to_bfqd(bic); |
86defc542 bfq: Get rid of _... |
727 |
struct bfq_group *bfqg = bfq_bio_bfqg(bfqd, bio); |
ea25da480 block, bfq: split... |
728 |
uint64_t serial_nr; |
86defc542 bfq: Get rid of _... |
729 |
serial_nr = bfqg_to_blkg(bfqg)->blkcg->css.serial_nr; |
ea25da480 block, bfq: split... |
730 731 732 733 734 735 |
/* * Check whether blkcg has changed. The condition may trigger * spuriously on a newly created cic but there's no harm. */ if (unlikely(!bfqd) || likely(bic->blkcg_serial_nr == serial_nr)) |
86defc542 bfq: Get rid of _... |
736 |
return; |
ea25da480 block, bfq: split... |
737 |
|
86defc542 bfq: Get rid of _... |
738 739 740 741 742 743 |
/* * New cgroup for this process. Make sure it is linked to bfq internal * cgroup hierarchy. */ bfq_link_bfqg(bfqd, bfqg); __bfq_bic_change_cgroup(bfqd, bic, bfqg); |
8f9bebc33 block, bfq: acces... |
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 |
/* * Update blkg_path for bfq_log_* functions. We cache this * path, and update it here, for the following * reasons. Operations on blkg objects in blk-cgroup are * protected with the request_queue lock, and not with the * lock that protects the instances of this scheduler * (bfqd->lock). This exposes BFQ to the following sort of * race. * * The blkg_lookup performed in bfq_get_queue, protected * through rcu, may happen to return the address of a copy of * the original blkg. If this is the case, then the * bfqg_and_blkg_get performed in bfq_get_queue, to pin down * the blkg, is useless: it does not prevent blk-cgroup code * from destroying both the original blkg and all objects * directly or indirectly referred by the copy of the * blkg. * * On the bright side, destroy operations on a blkg invoke, as * a first step, hooks of the scheduler associated with the * blkg. And these hooks are executed with bfqd->lock held for * BFQ. As a consequence, for any blkg associated with the * request queue this instance of the scheduler is attached * to, we are guaranteed that such a blkg is not destroyed, and * that all the pointers it contains are consistent, while we * are holding bfqd->lock. A blkg_lookup performed with * bfqd->lock held then returns a fully consistent blkg, which * remains consistent until this lock is held. * * Thanks to the last fact, and to the fact that: (1) bfqg has * been obtained through a blkg_lookup in the above * assignment, and (2) bfqd->lock is being held, here we can * safely use the policy data for the involved blkg (i.e., the * field bfqg->pd) to get to the blkg associated with bfqg, * and then we can safely use any field of blkg. After we * release bfqd->lock, even just getting blkg through this * bfqg may cause dangling references to be traversed, as * bfqg->pd may not exist any more. * * In view of the above facts, here we cache, in the bfqg, any * blkg data we may need for this bic, and for its associated * bfq_queue. As of now, we need to cache only the path of the * blkg, which is used in the bfq_log_* functions. * * Finally, note that bfqg itself needs to be protected from * destruction on the blkg_free of the original blkg (which * invokes bfq_pd_free). We use an additional private * refcounter for bfqg, to let it disappear only after no * bfq_queue refers to it any longer. */ blkg_path(bfqg_to_blkg(bfqg), bfqg->blkg_path, sizeof(bfqg->blkg_path)); |
ea25da480 block, bfq: split... |
795 |
bic->blkcg_serial_nr = serial_nr; |
ea25da480 block, bfq: split... |
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 |
} /** * bfq_flush_idle_tree - deactivate any entity on the idle tree of @st. * @st: the service tree being flushed. */ static void bfq_flush_idle_tree(struct bfq_service_tree *st) { struct bfq_entity *entity = st->first_idle; for (; entity ; entity = st->first_idle) __bfq_deactivate_entity(entity, false); } /** * bfq_reparent_leaf_entity - move leaf entity to the root_group. * @bfqd: the device data structure with the root group. |
576682fa5 block, bfq: make ... |
813 814 |
* @entity: the entity to move, if entity is a leaf; or the parent entity * of an active leaf entity to move, if entity is not a leaf. |
ea25da480 block, bfq: split... |
815 816 |
*/ static void bfq_reparent_leaf_entity(struct bfq_data *bfqd, |
576682fa5 block, bfq: make ... |
817 818 |
struct bfq_entity *entity, int ioprio_class) |
ea25da480 block, bfq: split... |
819 |
{ |
576682fa5 block, bfq: make ... |
820 821 822 823 824 825 826 827 |
struct bfq_queue *bfqq; struct bfq_entity *child_entity = entity; while (child_entity->my_sched_data) { /* leaf not reached yet */ struct bfq_sched_data *child_sd = child_entity->my_sched_data; struct bfq_service_tree *child_st = child_sd->service_tree + ioprio_class; struct rb_root *child_active = &child_st->active; |
ea25da480 block, bfq: split... |
828 |
|
576682fa5 block, bfq: make ... |
829 830 831 832 833 834 835 |
child_entity = bfq_entity_of(rb_first(child_active)); if (!child_entity) child_entity = child_sd->in_service_entity; } bfqq = bfq_entity_to_bfqq(child_entity); |
ea25da480 block, bfq: split... |
836 837 838 839 |
bfq_bfqq_move(bfqd, bfqq, bfqd->root_group); } /** |
576682fa5 block, bfq: make ... |
840 |
* bfq_reparent_active_queues - move to the root group all active queues. |
ea25da480 block, bfq: split... |
841 842 |
* @bfqd: the device data structure with the root group. * @bfqg: the group to move from. |
576682fa5 block, bfq: make ... |
843 |
* @st: the service tree to start the search from. |
ea25da480 block, bfq: split... |
844 |
*/ |
576682fa5 block, bfq: make ... |
845 846 847 848 |
static void bfq_reparent_active_queues(struct bfq_data *bfqd, struct bfq_group *bfqg, struct bfq_service_tree *st, int ioprio_class) |
ea25da480 block, bfq: split... |
849 850 |
{ struct rb_root *active = &st->active; |
576682fa5 block, bfq: make ... |
851 |
struct bfq_entity *entity; |
ea25da480 block, bfq: split... |
852 |
|
576682fa5 block, bfq: make ... |
853 854 |
while ((entity = bfq_entity_of(rb_first(active)))) bfq_reparent_leaf_entity(bfqd, entity, ioprio_class); |
ea25da480 block, bfq: split... |
855 856 857 |
if (bfqg->sched_data.in_service_entity) bfq_reparent_leaf_entity(bfqd, |
576682fa5 block, bfq: make ... |
858 859 |
bfqg->sched_data.in_service_entity, ioprio_class); |
ea25da480 block, bfq: split... |
860 861 862 863 864 865 866 867 868 869 |
} /** * bfq_pd_offline - deactivate the entity associated with @pd, * and reparent its children entities. * @pd: descriptor of the policy going offline. * * blkio already grabs the queue_lock for us, so no need to use * RCU-based magic */ |
dfb79af54 bfq: Declare loca... |
870 |
static void bfq_pd_offline(struct blkg_policy_data *pd) |
ea25da480 block, bfq: split... |
871 872 873 874 875 876 877 |
{ struct bfq_service_tree *st; struct bfq_group *bfqg = pd_to_bfqg(pd); struct bfq_data *bfqd = bfqg->bfqd; struct bfq_entity *entity = bfqg->my_entity; unsigned long flags; int i; |
52257ffbf block, bfq: put a... |
878 |
spin_lock_irqsave(&bfqd->lock, flags); |
ea25da480 block, bfq: split... |
879 |
if (!entity) /* root group */ |
52257ffbf block, bfq: put a... |
880 |
goto put_async_queues; |
ea25da480 block, bfq: split... |
881 |
|
ea25da480 block, bfq: split... |
882 883 884 885 886 887 888 889 |
/* * Empty all service_trees belonging to this group before * deactivating the group itself. */ for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) { st = bfqg->sched_data.service_tree + i; /* |
ea25da480 block, bfq: split... |
890 891 892 893 894 895 896 897 898 899 900 |
* It may happen that some queues are still active * (busy) upon group destruction (if the corresponding * processes have been forced to terminate). We move * all the leaf entities corresponding to these queues * to the root_group. * Also, it may happen that the group has an entity * in service, which is disconnected from the active * tree: it must be moved, too. * There is no need to put the sync queues, as the * scheduler has taken no reference. */ |
576682fa5 block, bfq: make ... |
901 |
bfq_reparent_active_queues(bfqd, bfqg, st, i); |
4d38a87fb block, bfq: invok... |
902 903 904 905 906 907 908 909 910 911 912 913 914 |
/* * The idle tree may still contain bfq_queues * belonging to exited task because they never * migrated to a different cgroup from the one being * destroyed now. In addition, even * bfq_reparent_active_queues() may happen to add some * entities to the idle tree. It happens if, in some * of the calls to bfq_bfqq_move() performed by * bfq_reparent_active_queues(), the queue to move is * empty and gets expired. */ bfq_flush_idle_tree(st); |
ea25da480 block, bfq: split... |
915 916 917 |
} __bfq_deactivate_entity(entity, false); |
52257ffbf block, bfq: put a... |
918 919 |
put_async_queues: |
ea25da480 block, bfq: split... |
920 |
bfq_put_async_queues(bfqd, bfqg); |
54c08ef2d bfq: Track whethe... |
921 |
bfqg->online = false; |
ea25da480 block, bfq: split... |
922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 |
spin_unlock_irqrestore(&bfqd->lock, flags); /* * @blkg is going offline and will be ignored by * blkg_[rw]stat_recursive_sum(). Transfer stats to the parent so * that they don't get lost. If IOs complete after this point, the * stats for them will be lost. Oh well... */ bfqg_stats_xfer_dead(bfqg); } void bfq_end_wr_async(struct bfq_data *bfqd) { struct blkcg_gq *blkg; list_for_each_entry(blkg, &bfqd->queue->blkg_list, q_node) { struct bfq_group *bfqg = blkg_to_bfqg(blkg); bfq_end_wr_async_queues(bfqd, bfqg); } bfq_end_wr_async_queues(bfqd, bfqd->root_group); } |
795fe54c2 bfq: Add per-devi... |
944 |
static int bfq_io_show_weight_legacy(struct seq_file *sf, void *v) |
ea25da480 block, bfq: split... |
945 946 947 948 949 950 951 952 953 954 955 956 957 |
{ struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg); unsigned int val = 0; if (bfqgd) val = bfqgd->weight; seq_printf(sf, "%u ", val); return 0; } |
795fe54c2 bfq: Add per-devi... |
958 959 |
static u64 bfqg_prfill_weight_device(struct seq_file *sf, struct blkg_policy_data *pd, int off) |
5ff047e32 bfq: Extract bfq_... |
960 |
{ |
795fe54c2 bfq: Add per-devi... |
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 |
struct bfq_group *bfqg = pd_to_bfqg(pd); if (!bfqg->entity.dev_weight) return 0; return __blkg_prfill_u64(sf, pd, bfqg->entity.dev_weight); } static int bfq_io_show_weight(struct seq_file *sf, void *v) { struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg); seq_printf(sf, "default %u ", bfqgd->weight); blkcg_print_blkgs(sf, blkcg, bfqg_prfill_weight_device, &blkcg_policy_bfq, 0, false); return 0; } static void bfq_group_set_weight(struct bfq_group *bfqg, u64 weight, u64 dev_weight) { weight = dev_weight ?: weight; bfqg->entity.dev_weight = dev_weight; |
5ff047e32 bfq: Extract bfq_... |
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 |
/* * Setting the prio_changed flag of the entity * to 1 with new_weight == weight would re-set * the value of the weight to its ioprio mapping. * Set the flag only if necessary. */ if ((unsigned short)weight != bfqg->entity.new_weight) { bfqg->entity.new_weight = (unsigned short)weight; /* * Make sure that the above new value has been * stored in bfqg->entity.new_weight before * setting the prio_changed flag. In fact, * this flag may be read asynchronously (in * critical sections protected by a different * lock than that held here), and finding this * flag set may cause the execution of the code * for updating parameters whose value may * depend also on bfqg->entity.new_weight (in * __bfq_entity_update_weight_prio). * This barrier makes sure that the new value * of bfqg->entity.new_weight is correctly * seen in that code. */ smp_wmb(); bfqg->entity.prio_changed = 1; } } |
ea25da480 block, bfq: split... |
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 |
static int bfq_io_set_weight_legacy(struct cgroup_subsys_state *css, struct cftype *cftype, u64 val) { struct blkcg *blkcg = css_to_blkcg(css); struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg); struct blkcg_gq *blkg; int ret = -ERANGE; if (val < BFQ_MIN_WEIGHT || val > BFQ_MAX_WEIGHT) return ret; ret = 0; spin_lock_irq(&blkcg->lock); bfqgd->weight = (unsigned short)val; hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) { struct bfq_group *bfqg = blkg_to_bfqg(blkg); |
5ff047e32 bfq: Extract bfq_... |
1029 |
if (bfqg) |
795fe54c2 bfq: Add per-devi... |
1030 |
bfq_group_set_weight(bfqg, val, 0); |
ea25da480 block, bfq: split... |
1031 1032 1033 1034 1035 |
} spin_unlock_irq(&blkcg->lock); return ret; } |
795fe54c2 bfq: Add per-devi... |
1036 1037 1038 |
static ssize_t bfq_io_set_device_weight(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off) |
ea25da480 block, bfq: split... |
1039 |
{ |
795fe54c2 bfq: Add per-devi... |
1040 1041 1042 1043 1044 |
int ret; struct blkg_conf_ctx ctx; struct blkcg *blkcg = css_to_blkcg(of_css(of)); struct bfq_group *bfqg; u64 v; |
ea25da480 block, bfq: split... |
1045 |
|
795fe54c2 bfq: Add per-devi... |
1046 |
ret = blkg_conf_prep(blkcg, &blkcg_policy_bfq, buf, &ctx); |
ea25da480 block, bfq: split... |
1047 1048 |
if (ret) return ret; |
795fe54c2 bfq: Add per-devi... |
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 |
if (sscanf(ctx.body, "%llu", &v) == 1) { /* require "default" on dfl */ ret = -ERANGE; if (!v) goto out; } else if (!strcmp(strim(ctx.body), "default")) { v = 0; } else { ret = -EINVAL; goto out; } bfqg = blkg_to_bfqg(ctx.blkg); ret = -ERANGE; if (!v || (v >= BFQ_MIN_WEIGHT && v <= BFQ_MAX_WEIGHT)) { bfq_group_set_weight(bfqg, bfqg->entity.weight, v); ret = 0; } out: blkg_conf_finish(&ctx); |
fc8ebd01d block, bfq: retur... |
1070 |
return ret ?: nbytes; |
ea25da480 block, bfq: split... |
1071 |
} |
795fe54c2 bfq: Add per-devi... |
1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 |
static ssize_t bfq_io_set_weight(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off) { char *endp; int ret; u64 v; buf = strim(buf); /* "WEIGHT" or "default WEIGHT" sets the default weight */ v = simple_strtoull(buf, &endp, 0); if (*endp == '\0' || sscanf(buf, "default %llu", &v) == 1) { ret = bfq_io_set_weight_legacy(of_css(of), NULL, v); return ret ?: nbytes; } return bfq_io_set_device_weight(of, buf, nbytes, off); } |
a557f1c7f bfq-iosched: relo... |
1091 |
static int bfqg_print_rwstat(struct seq_file *sf, void *v) |
ea25da480 block, bfq: split... |
1092 |
{ |
a557f1c7f bfq-iosched: relo... |
1093 1094 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat, &blkcg_policy_bfq, seq_cft(sf)->private, true); |
ea25da480 block, bfq: split... |
1095 1096 |
return 0; } |
a557f1c7f bfq-iosched: relo... |
1097 1098 |
static u64 bfqg_prfill_rwstat_recursive(struct seq_file *sf, struct blkg_policy_data *pd, int off) |
ea25da480 block, bfq: split... |
1099 |
{ |
a557f1c7f bfq-iosched: relo... |
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 |
struct blkg_rwstat_sample sum; blkg_rwstat_recursive_sum(pd_to_blkg(pd), &blkcg_policy_bfq, off, &sum); return __blkg_prfill_rwstat(sf, pd, &sum); } static int bfqg_print_rwstat_recursive(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), bfqg_prfill_rwstat_recursive, &blkcg_policy_bfq, seq_cft(sf)->private, true); return 0; } |
fd41e6033 bfq-iosched: stop... |
1113 |
#ifdef CONFIG_BFQ_CGROUP_DEBUG |
a557f1c7f bfq-iosched: relo... |
1114 1115 1116 1117 |
static int bfqg_print_stat(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_stat, &blkcg_policy_bfq, seq_cft(sf)->private, false); |
ea25da480 block, bfq: split... |
1118 1119 1120 1121 1122 1123 |
return 0; } static u64 bfqg_prfill_stat_recursive(struct seq_file *sf, struct blkg_policy_data *pd, int off) { |
d6258980d bfq-iosched: move... |
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 |
struct blkcg_gq *blkg = pd_to_blkg(pd); struct blkcg_gq *pos_blkg; struct cgroup_subsys_state *pos_css; u64 sum = 0; lockdep_assert_held(&blkg->q->queue_lock); rcu_read_lock(); blkg_for_each_descendant_pre(pos_blkg, pos_css, blkg) { struct bfq_stat *stat; if (!pos_blkg->online) continue; stat = (void *)blkg_to_pd(pos_blkg, &blkcg_policy_bfq) + off; sum += bfq_stat_read(stat) + atomic64_read(&stat->aux_cnt); } rcu_read_unlock(); |
ea25da480 block, bfq: split... |
1142 1143 |
return __blkg_prfill_u64(sf, pd, sum); } |
ea25da480 block, bfq: split... |
1144 1145 1146 1147 1148 1149 1150 |
static int bfqg_print_stat_recursive(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), bfqg_prfill_stat_recursive, &blkcg_policy_bfq, seq_cft(sf)->private, false); return 0; } |
ea25da480 block, bfq: split... |
1151 1152 1153 |
static u64 bfqg_prfill_sectors(struct seq_file *sf, struct blkg_policy_data *pd, int off) { |
fd41e6033 bfq-iosched: stop... |
1154 1155 |
struct bfq_group *bfqg = blkg_to_bfqg(pd->blkg); u64 sum = blkg_rwstat_total(&bfqg->stats.bytes); |
ea25da480 block, bfq: split... |
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 |
return __blkg_prfill_u64(sf, pd, sum >> 9); } static int bfqg_print_stat_sectors(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), bfqg_prfill_sectors, &blkcg_policy_bfq, 0, false); return 0; } static u64 bfqg_prfill_sectors_recursive(struct seq_file *sf, struct blkg_policy_data *pd, int off) { |
7af6fd911 blk-cgroup: intro... |
1170 |
struct blkg_rwstat_sample tmp; |
5d0b6e48c blk-cgroup: pass ... |
1171 |
|
fd41e6033 bfq-iosched: stop... |
1172 1173 |
blkg_rwstat_recursive_sum(pd->blkg, &blkcg_policy_bfq, offsetof(struct bfq_group, stats.bytes), &tmp); |
ea25da480 block, bfq: split... |
1174 |
|
7af6fd911 blk-cgroup: intro... |
1175 1176 |
return __blkg_prfill_u64(sf, pd, (tmp.cnt[BLKG_RWSTAT_READ] + tmp.cnt[BLKG_RWSTAT_WRITE]) >> 9); |
ea25da480 block, bfq: split... |
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 |
} static int bfqg_print_stat_sectors_recursive(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), bfqg_prfill_sectors_recursive, &blkcg_policy_bfq, 0, false); return 0; } static u64 bfqg_prfill_avg_queue_size(struct seq_file *sf, struct blkg_policy_data *pd, int off) { struct bfq_group *bfqg = pd_to_bfqg(pd); |
c0ce79dca blk-cgroup: move ... |
1191 |
u64 samples = bfq_stat_read(&bfqg->stats.avg_queue_size_samples); |
ea25da480 block, bfq: split... |
1192 1193 1194 |
u64 v = 0; if (samples) { |
c0ce79dca blk-cgroup: move ... |
1195 |
v = bfq_stat_read(&bfqg->stats.avg_queue_size_sum); |
ea25da480 block, bfq: split... |
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 |
v = div64_u64(v, samples); } __blkg_prfill_u64(sf, pd, v); return 0; } /* print avg_queue_size */ static int bfqg_print_avg_queue_size(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), bfqg_prfill_avg_queue_size, &blkcg_policy_bfq, 0, false); return 0; } |
8060c47ba block: rename CON... |
1210 |
#endif /* CONFIG_BFQ_CGROUP_DEBUG */ |
ea25da480 block, bfq: split... |
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 |
struct bfq_group *bfq_create_group_hierarchy(struct bfq_data *bfqd, int node) { int ret; ret = blkcg_activate_policy(bfqd->queue, &blkcg_policy_bfq); if (ret) return NULL; return blkg_to_bfqg(bfqd->queue->root_blkg); } struct blkcg_policy blkcg_policy_bfq = { .dfl_cftypes = bfq_blkg_files, .legacy_cftypes = bfq_blkcg_legacy_files, .cpd_alloc_fn = bfq_cpd_alloc, .cpd_init_fn = bfq_cpd_init, .cpd_bind_fn = bfq_cpd_init, .cpd_free_fn = bfq_cpd_free, .pd_alloc_fn = bfq_pd_alloc, .pd_init_fn = bfq_pd_init, .pd_offline_fn = bfq_pd_offline, .pd_free_fn = bfq_pd_free, .pd_reset_stats_fn = bfq_pd_reset_stats, }; struct cftype bfq_blkcg_legacy_files[] = { { .name = "bfq.weight", |
cf8929885 cgroup/bfq: rever... |
1242 |
.flags = CFTYPE_NOT_ON_ROOT, |
795fe54c2 bfq: Add per-devi... |
1243 |
.seq_show = bfq_io_show_weight_legacy, |
ea25da480 block, bfq: split... |
1244 1245 |
.write_u64 = bfq_io_set_weight_legacy, }, |
795fe54c2 bfq: Add per-devi... |
1246 1247 1248 1249 1250 1251 |
{ .name = "bfq.weight_device", .flags = CFTYPE_NOT_ON_ROOT, .seq_show = bfq_io_show_weight, .write = bfq_io_set_weight, }, |
ea25da480 block, bfq: split... |
1252 1253 1254 |
/* statistics, covers only the tasks in the bfqg */ { |
ea25da480 block, bfq: split... |
1255 |
.name = "bfq.io_service_bytes", |
fd41e6033 bfq-iosched: stop... |
1256 1257 |
.private = offsetof(struct bfq_group, stats.bytes), .seq_show = bfqg_print_rwstat, |
ea25da480 block, bfq: split... |
1258 1259 1260 |
}, { .name = "bfq.io_serviced", |
fd41e6033 bfq-iosched: stop... |
1261 1262 |
.private = offsetof(struct bfq_group, stats.ios), .seq_show = bfqg_print_rwstat, |
ea25da480 block, bfq: split... |
1263 |
}, |
8060c47ba block: rename CON... |
1264 |
#ifdef CONFIG_BFQ_CGROUP_DEBUG |
a33801e8b block, bfq: move ... |
1265 1266 1267 1268 1269 1270 1271 1272 1273 |
{ .name = "bfq.time", .private = offsetof(struct bfq_group, stats.time), .seq_show = bfqg_print_stat, }, { .name = "bfq.sectors", .seq_show = bfqg_print_stat_sectors, }, |
ea25da480 block, bfq: split... |
1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 |
{ .name = "bfq.io_service_time", .private = offsetof(struct bfq_group, stats.service_time), .seq_show = bfqg_print_rwstat, }, { .name = "bfq.io_wait_time", .private = offsetof(struct bfq_group, stats.wait_time), .seq_show = bfqg_print_rwstat, }, { .name = "bfq.io_merged", .private = offsetof(struct bfq_group, stats.merged), .seq_show = bfqg_print_rwstat, }, { .name = "bfq.io_queued", .private = offsetof(struct bfq_group, stats.queued), .seq_show = bfqg_print_rwstat, }, |
8060c47ba block: rename CON... |
1294 |
#endif /* CONFIG_BFQ_CGROUP_DEBUG */ |
ea25da480 block, bfq: split... |
1295 |
|
636b8fe86 block, bfq: fix s... |
1296 |
/* the same statistics which cover the bfqg and its descendants */ |
ea25da480 block, bfq: split... |
1297 |
{ |
ea25da480 block, bfq: split... |
1298 |
.name = "bfq.io_service_bytes_recursive", |
fd41e6033 bfq-iosched: stop... |
1299 1300 |
.private = offsetof(struct bfq_group, stats.bytes), .seq_show = bfqg_print_rwstat_recursive, |
ea25da480 block, bfq: split... |
1301 1302 1303 |
}, { .name = "bfq.io_serviced_recursive", |
fd41e6033 bfq-iosched: stop... |
1304 1305 |
.private = offsetof(struct bfq_group, stats.ios), .seq_show = bfqg_print_rwstat_recursive, |
ea25da480 block, bfq: split... |
1306 |
}, |
8060c47ba block: rename CON... |
1307 |
#ifdef CONFIG_BFQ_CGROUP_DEBUG |
a33801e8b block, bfq: move ... |
1308 1309 1310 1311 1312 1313 1314 1315 1316 |
{ .name = "bfq.time_recursive", .private = offsetof(struct bfq_group, stats.time), .seq_show = bfqg_print_stat_recursive, }, { .name = "bfq.sectors_recursive", .seq_show = bfqg_print_stat_sectors_recursive, }, |
ea25da480 block, bfq: split... |
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 |
{ .name = "bfq.io_service_time_recursive", .private = offsetof(struct bfq_group, stats.service_time), .seq_show = bfqg_print_rwstat_recursive, }, { .name = "bfq.io_wait_time_recursive", .private = offsetof(struct bfq_group, stats.wait_time), .seq_show = bfqg_print_rwstat_recursive, }, { .name = "bfq.io_merged_recursive", .private = offsetof(struct bfq_group, stats.merged), .seq_show = bfqg_print_rwstat_recursive, }, { .name = "bfq.io_queued_recursive", .private = offsetof(struct bfq_group, stats.queued), .seq_show = bfqg_print_rwstat_recursive, }, { .name = "bfq.avg_queue_size", .seq_show = bfqg_print_avg_queue_size, }, { .name = "bfq.group_wait_time", .private = offsetof(struct bfq_group, stats.group_wait_time), .seq_show = bfqg_print_stat, }, { .name = "bfq.idle_time", .private = offsetof(struct bfq_group, stats.idle_time), .seq_show = bfqg_print_stat, }, { .name = "bfq.empty_time", .private = offsetof(struct bfq_group, stats.empty_time), .seq_show = bfqg_print_stat, }, { .name = "bfq.dequeue", .private = offsetof(struct bfq_group, stats.dequeue), .seq_show = bfqg_print_stat, }, |
8060c47ba block: rename CON... |
1361 |
#endif /* CONFIG_BFQ_CGROUP_DEBUG */ |
ea25da480 block, bfq: split... |
1362 1363 1364 1365 1366 1367 |
{ } /* terminate */ }; struct cftype bfq_blkg_files[] = { { .name = "bfq.weight", |
cf8929885 cgroup/bfq: rever... |
1368 |
.flags = CFTYPE_NOT_ON_ROOT, |
ea25da480 block, bfq: split... |
1369 1370 1371 1372 1373 1374 1375 |
.seq_show = bfq_io_show_weight, .write = bfq_io_set_weight, }, {} /* terminate */ }; #else /* CONFIG_BFQ_GROUP_IOSCHED */ |
ea25da480 block, bfq: split... |
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 |
void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq, struct bfq_group *bfqg) {} void bfq_init_entity(struct bfq_entity *entity, struct bfq_group *bfqg) { struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); entity->weight = entity->new_weight; entity->orig_weight = entity->new_weight; if (bfqq) { bfqq->ioprio = bfqq->new_ioprio; bfqq->ioprio_class = bfqq->new_ioprio_class; } entity->sched_data = &bfqg->sched_data; } void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio) {} void bfq_end_wr_async(struct bfq_data *bfqd) { bfq_end_wr_async_queues(bfqd, bfqd->root_group); } |
86defc542 bfq: Get rid of _... |
1398 |
struct bfq_group *bfq_bio_bfqg(struct bfq_data *bfqd, struct bio *bio) |
ea25da480 block, bfq: split... |
1399 1400 1401 1402 1403 1404 1405 1406 |
{ return bfqd->root_group; } struct bfq_group *bfqq_group(struct bfq_queue *bfqq) { return bfqq->bfqd->root_group; } |
4d8340d0d block, bfq: remov... |
1407 1408 1409 |
void bfqg_and_blkg_get(struct bfq_group *bfqg) {} void bfqg_and_blkg_put(struct bfq_group *bfqg) {} |
ea25da480 block, bfq: split... |
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 |
struct bfq_group *bfq_create_group_hierarchy(struct bfq_data *bfqd, int node) { struct bfq_group *bfqg; int i; bfqg = kmalloc_node(sizeof(*bfqg), GFP_KERNEL | __GFP_ZERO, node); if (!bfqg) return NULL; for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) bfqg->sched_data.service_tree[i] = BFQ_SERVICE_TREE_INIT; return bfqg; } #endif /* CONFIG_BFQ_GROUP_IOSCHED */ |