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| author | Yu Kuai <yukuai3@huawei.com> | 2022-03-18 21:01:44 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-03-18 09:57:56 -0600 |
| commit | 8f9e7b65f833cb9a4b2e2f54a049d74df394d906 (patch) | |
| tree | 53ea2561819061d557497972434541c212a7c2a2 /block/blk-throttle.c | |
| parent | 0a9a25ca78437b39e691bcc3dc8240455b803d8d (diff) | |
| download | lwn-8f9e7b65f833cb9a4b2e2f54a049d74df394d906.tar.gz lwn-8f9e7b65f833cb9a4b2e2f54a049d74df394d906.zip | |
block: cancel all throttled bios in del_gendisk()
Throttled bios can't be issued after del_gendisk() is done, thus
it's better to cancel them immediately rather than waiting for
throttle is done.
For example, if user thread is throttled with low bps while it's
issuing large io, and the device is deleted. The user thread will
wait for a long time for io to return.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20220318130144.1066064-4-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-throttle.c')
| -rw-r--r-- | block/blk-throttle.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 880701d0106f..469c483719be 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -874,7 +874,8 @@ static bool tg_may_dispatch(struct throtl_grp *tg, struct bio *bio, bio != throtl_peek_queued(&tg->service_queue.queued[rw])); /* If tg->bps = -1, then BW is unlimited */ - if (bps_limit == U64_MAX && iops_limit == UINT_MAX) { + if ((bps_limit == U64_MAX && iops_limit == UINT_MAX) || + tg->flags & THROTL_TG_CANCELING) { if (wait) *wait = 0; return true; @@ -1776,6 +1777,39 @@ static bool throtl_hierarchy_can_upgrade(struct throtl_grp *tg) return false; } +void blk_throtl_cancel_bios(struct request_queue *q) +{ + struct cgroup_subsys_state *pos_css; + struct blkcg_gq *blkg; + + spin_lock_irq(&q->queue_lock); + /* + * queue_lock is held, rcu lock is not needed here technically. + * However, rcu lock is still held to emphasize that following + * path need RCU protection and to prevent warning from lockdep. + */ + rcu_read_lock(); + blkg_for_each_descendant_post(blkg, pos_css, q->root_blkg) { + struct throtl_grp *tg = blkg_to_tg(blkg); + struct throtl_service_queue *sq = &tg->service_queue; + + /* + * Set the flag to make sure throtl_pending_timer_fn() won't + * stop until all throttled bios are dispatched. + */ + blkg_to_tg(blkg)->flags |= THROTL_TG_CANCELING; + /* + * Update disptime after setting the above flag to make sure + * throtl_select_dispatch() won't exit without dispatching. + */ + tg_update_disptime(tg); + + throtl_schedule_pending_timer(sq, jiffies + 1); + } + rcu_read_unlock(); + spin_unlock_irq(&q->queue_lock); +} + static bool throtl_can_upgrade(struct throtl_data *td, struct throtl_grp *this_tg) { |