Lines Matching refs:dc
30 static uint64_t __calc_target_rate(struct cached_dev *dc)
32 struct cache_set *c = dc->disk.c;
48 div64_u64(bdev_nr_sectors(dc->bdev) << WRITEBACK_SHARE_SHIFT,
52 div_u64(cache_sectors * dc->writeback_percent, 100);
61 static void __update_writeback_rate(struct cached_dev *dc)
83 int64_t target = __calc_target_rate(dc);
84 int64_t dirty = bcache_dev_sectors_dirty(&dc->disk);
87 div_s64(error, dc->writeback_rate_p_term_inverse);
101 struct cache_set *c = dc->disk.c;
105 if (dc->writeback_consider_fragment &&
113 fp_term = (int64_t)dc->writeback_rate_fp_term_low *
116 fp_term = (int64_t)dc->writeback_rate_fp_term_mid *
119 fp_term = (int64_t)dc->writeback_rate_fp_term_high *
129 if ((error < 0 && dc->writeback_rate_integral > 0) ||
131 dc->writeback_rate.next + NSEC_PER_MSEC))) {
142 dc->writeback_rate_integral += error *
143 dc->writeback_rate_update_seconds;
146 integral_scaled = div_s64(dc->writeback_rate_integral,
147 dc->writeback_rate_i_term_inverse);
150 dc->writeback_rate_minimum, NSEC_PER_SEC);
152 dc->writeback_rate_proportional = proportional_scaled;
153 dc->writeback_rate_integral_scaled = integral_scaled;
154 dc->writeback_rate_change = new_rate -
155 atomic_long_read(&dc->writeback_rate.rate);
156 atomic_long_set(&dc->writeback_rate.rate, new_rate);
157 dc->writeback_rate_target = target;
197 * identical dc->writeback_rate_update_seconds values, it is about 6
200 * to each dc->writeback_rate.rate.
208 struct cached_dev *dc)
224 atomic_long_set(&dc->writeback_rate.rate, INT_MAX);
227 dc->writeback_rate_proportional = 0;
228 dc->writeback_rate_integral_scaled = 0;
229 dc->writeback_rate_change = 0;
244 struct cached_dev *dc = container_of(to_delayed_work(work),
247 struct cache_set *c = dc->disk.c;
253 set_bit(BCACHE_DEV_RATE_DW_RUNNING, &dc->disk.flags);
261 if (!test_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags) ||
263 clear_bit(BCACHE_DEV_RATE_DW_RUNNING, &dc->disk.flags);
275 if (atomic_read(&dc->has_dirty) && dc->writeback_percent &&
276 !set_at_max_writeback_rate(c, dc)) {
278 if (!down_read_trylock((&dc->writeback_lock))) {
279 dc->rate_update_retry++;
280 if (dc->rate_update_retry <=
283 down_read(&dc->writeback_lock);
284 dc->rate_update_retry = 0;
286 __update_writeback_rate(dc);
288 up_read(&dc->writeback_lock);
297 if (test_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags) &&
299 schedule_delayed_work(&dc->writeback_rate_update,
300 dc->writeback_rate_update_seconds * HZ);
307 clear_bit(BCACHE_DEV_RATE_DW_RUNNING, &dc->disk.flags);
312 static unsigned int writeback_delay(struct cached_dev *dc,
315 if (test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) ||
316 !dc->writeback_percent)
319 return bch_next_delay(&dc->writeback_rate, sectors);
324 struct cached_dev *dc;
336 if (!io->dc->writeback_percent)
355 struct cached_dev *dc = io->dc;
372 atomic_inc(&PTR_BUCKET(dc->disk.c, &w->key, i)->pin);
374 ret = bch_btree_insert(dc->disk.c, &keys, NULL, &w->key);
380 ? &dc->disk.c->writeback_keys_failed
381 : &dc->disk.c->writeback_keys_done);
384 bch_keybuf_del(&dc->writeback_keys, w);
385 up(&dc->in_flight);
397 bch_count_backing_io_errors(io->dc, bio);
407 struct cached_dev *dc = io->dc;
411 if (atomic_read(&dc->writeback_sequence_next) != io->sequence) {
413 closure_wait(&dc->writeback_ordering_wait, cl);
415 if (atomic_read(&dc->writeback_sequence_next) == io->sequence) {
420 closure_wake_up(&dc->writeback_ordering_wait);
423 continue_at(cl, write_dirty, io->dc->writeback_write_wq);
439 bio_set_dev(&io->bio, io->dc->bdev);
443 closure_bio_submit(io->dc->disk.c, &io->bio, cl);
446 atomic_set(&dc->writeback_sequence_next, next_sequence);
447 closure_wake_up(&dc->writeback_ordering_wait);
449 continue_at(cl, write_dirty_finish, io->dc->writeback_write_wq);
458 bch_count_io_errors(io->dc->disk.c->cache,
469 closure_bio_submit(io->dc->disk.c, &io->bio, cl);
471 continue_at(cl, write_dirty, io->dc->writeback_write_wq);
474 static void read_dirty(struct cached_dev *dc)
484 BUG_ON(!llist_empty(&dc->writeback_ordering_wait.list));
485 atomic_set(&dc->writeback_sequence_next, sequence);
493 next = bch_keybuf_next(&dc->writeback_keys);
496 !test_bit(CACHE_SET_IO_DISABLE, &dc->disk.c->flags) &&
502 BUG_ON(ptr_stale(dc->disk.c, &next->key, 0));
533 } while ((next = bch_keybuf_next(&dc->writeback_keys)));
546 io->dc = dc;
552 bio_set_dev(&io->bio, dc->disk.c->cache->bdev);
560 down(&dc->in_flight);
570 delay = writeback_delay(dc, size);
573 !test_bit(CACHE_SET_IO_DISABLE, &dc->disk.c->flags) &&
576 delay = writeback_delay(dc, 0);
584 bch_keybuf_del(&dc->writeback_keys, w);
643 struct cached_dev *dc = container_of(buf,
647 BUG_ON(KEY_INODE(k) != dc->disk.id);
652 static void refill_full_stripes(struct cached_dev *dc)
654 struct keybuf *buf = &dc->writeback_keys;
659 stripe = offset_to_stripe(&dc->disk, KEY_OFFSET(&buf->last_scanned));
666 stripe = find_next_bit(dc->disk.full_dirty_stripes,
667 dc->disk.nr_stripes, stripe);
669 if (stripe == dc->disk.nr_stripes)
672 next_stripe = find_next_zero_bit(dc->disk.full_dirty_stripes,
673 dc->disk.nr_stripes, stripe);
675 buf->last_scanned = KEY(dc->disk.id,
676 stripe * dc->disk.stripe_size, 0);
678 bch_refill_keybuf(dc->disk.c, buf,
679 &KEY(dc->disk.id,
680 next_stripe * dc->disk.stripe_size, 0),
691 if (stripe == dc->disk.nr_stripes) {
701 static bool refill_dirty(struct cached_dev *dc)
703 struct keybuf *buf = &dc->writeback_keys;
704 struct bkey start = KEY(dc->disk.id, 0, 0);
705 struct bkey end = KEY(dc->disk.id, MAX_KEY_OFFSET, 0);
717 if (dc->partial_stripes_expensive) {
718 refill_full_stripes(dc);
724 bch_refill_keybuf(dc->disk.c, buf, &end, dirty_pred);
734 bch_refill_keybuf(dc->disk.c, buf, &start_pos, dirty_pred);
741 struct cached_dev *dc = arg;
742 struct cache_set *c = dc->disk.c;
745 bch_ratelimit_reset(&dc->writeback_rate);
749 down_write(&dc->writeback_lock);
758 if (!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) &&
759 (!atomic_read(&dc->has_dirty) || !dc->writeback_running)) {
760 up_write(&dc->writeback_lock);
773 searched_full_index = refill_dirty(dc);
776 RB_EMPTY_ROOT(&dc->writeback_keys.keys)) {
777 atomic_set(&dc->has_dirty, 0);
778 SET_BDEV_STATE(&dc->sb, BDEV_STATE_CLEAN);
779 bch_write_bdev_super(dc, NULL);
786 if (test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)) {
790 memset(&dc->sb.set_uuid, 0, 16);
791 SET_BDEV_STATE(&dc->sb, BDEV_STATE_NONE);
793 bch_write_bdev_super(dc, &cl);
796 up_write(&dc->writeback_lock);
818 up_write(&dc->writeback_lock);
820 read_dirty(dc);
823 unsigned int delay = dc->writeback_delay * HZ;
828 !test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags))
831 bch_ratelimit_reset(&dc->writeback_rate);
835 if (dc->writeback_write_wq)
836 destroy_workqueue(dc->writeback_write_wq);
838 cached_dev_put(dc);
1048 void bch_cached_dev_writeback_init(struct cached_dev *dc)
1050 sema_init(&dc->in_flight, 64);
1051 init_rwsem(&dc->writeback_lock);
1052 bch_keybuf_init(&dc->writeback_keys);
1054 dc->writeback_metadata = true;
1055 dc->writeback_running = false;
1056 dc->writeback_consider_fragment = true;
1057 dc->writeback_percent = 10;
1058 dc->writeback_delay = 30;
1059 atomic_long_set(&dc->writeback_rate.rate, 1024);
1060 dc->writeback_rate_minimum = 8;
1062 dc->writeback_rate_update_seconds = WRITEBACK_RATE_UPDATE_SECS_DEFAULT;
1063 dc->writeback_rate_p_term_inverse = 40;
1064 dc->writeback_rate_fp_term_low = 1;
1065 dc->writeback_rate_fp_term_mid = 10;
1066 dc->writeback_rate_fp_term_high = 1000;
1067 dc->writeback_rate_i_term_inverse = 10000;
1069 /* For dc->writeback_lock contention in update_writeback_rate() */
1070 dc->rate_update_retry = 0;
1072 WARN_ON(test_and_clear_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags));
1073 INIT_DELAYED_WORK(&dc->writeback_rate_update, update_writeback_rate);
1076 int bch_cached_dev_writeback_start(struct cached_dev *dc)
1078 dc->writeback_write_wq = alloc_workqueue("bcache_writeback_wq",
1080 if (!dc->writeback_write_wq)
1083 cached_dev_get(dc);
1084 dc->writeback_thread = kthread_create(bch_writeback_thread, dc,
1086 if (IS_ERR(dc->writeback_thread)) {
1087 cached_dev_put(dc);
1088 destroy_workqueue(dc->writeback_write_wq);
1089 return PTR_ERR(dc->writeback_thread);
1091 dc->writeback_running = true;
1093 WARN_ON(test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags));
1094 schedule_delayed_work(&dc->writeback_rate_update,
1095 dc->writeback_rate_update_seconds * HZ);
1097 bch_writeback_queue(dc);