| Message ID | 20241119002815.600608-12-bvanassche@acm.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | Improve write performance for zoned UFS devices | expand |
On 11/19/24 09:28, Bart Van Assche wrote: > Help the CPU branch predictor in case of a cache hit by handling the cache > hit scenario first. > > Signed-off-by: Bart Van Assche <bvanassche@acm.org> Not sure this really helps but looks OK to me. Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
diff --git a/block/blk-mq.c b/block/blk-mq.c index ece567b1b6be..56a6b5bef39f 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3123,12 +3123,12 @@ 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);
Help the CPU branch predictor in case of a cache hit by handling the cache hit scenario first. Signed-off-by: Bart Van Assche <bvanassche@acm.org> --- block/blk-mq.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)