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blk-mq: reinsert cached request to the list

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A previous commit removed an optimization out of caution for a scenario
that turns out not to be real: all the "queue_exit" goto's are safe to
reinsert the request into the cached_rq's plug list as they are either
from a non-blocking path, or a successful merge that already holds the
queue reference. This optimization is most needed for small sequential
workloads that successfully merge into larger requests.

Fixes: dc278e9bf2 ("blk-mq: pop cached request if it is usable")
Suggested-by: Ming Lei <tom.leiming@gmail.com>
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://patch.msgid.link/20260526153531.2365935-1-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2026-05-26 08:35:31 -07:00 committed by Jens Axboe
parent f698276991
commit b051bb6bf0
1 changed files with 1 additions and 1 deletions
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2
block/blk-mq.c
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@ -3246,7 +3246,7 @@ void blk_mq_submit_bio(struct bio *bio)
if (!rq)
blk_queue_exit(q);
else
blk_mq_free_request(rq);
rq_list_add_head(&plug->cached_rqs, rq);
}
#ifdef CONFIG_BLK_MQ_STACKING