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blk-mq: only try to run plug merge if request has same queue with incoming bio

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It is obvious that io merge can't be done between two different queues, so
just try to run io merge in case of same queue.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20211102133502.3619184-2-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2021-11-02 21:35:00 +08:00 committed by Jens Axboe
parent 781dd830ec
commit a1cb65377e
1 changed files with 4 additions and 2 deletions
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6
block/blk-merge.c
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@ -1101,9 +1101,11 @@ bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
* the same queue, there should be only one such rq in a queue
*/
*same_queue_rq = true;
if (blk_attempt_bio_merge(q, rq, bio, nr_segs, false) ==
BIO_MERGE_OK)
return true;
}
if (blk_attempt_bio_merge(q, rq, bio, nr_segs, false) == BIO_MERGE_OK)
return true;
return false;
}