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block: Reorder the request allocation code in blk_mq_submit_bio()

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Help the CPU branch predictor in case of a cache hit by handling the cache
hit scenario first.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20241218212246.1073149-2-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2024-12-18 13:22:45 -08:00 committed by Jens Axboe
parent e7b94c5c6f
commit 44e4138159
1 changed files with 3 additions and 3 deletions
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6
block/blk-mq.c
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@ -3125,12 +3125,12 @@ void blk_mq_submit_bio(struct bio *bio)
goto queue_exit;
new_request:
if (!rq) {
if (rq) {
blk_mq_use_cached_rq(rq, plug, bio);
} else {
rq = blk_mq_get_new_requests(q, plug, bio, nr_segs);
if (unlikely(!rq))
goto queue_exit;
} else {
blk_mq_use_cached_rq(rq, plug, bio);
}
trace_block_getrq(bio);