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blk-mq: never redirect polled IO completions 

It's pointless to do so, we are by definition on the CPU we want/need
to be, as that's the one waiting for a completion event.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Jens Axboe 2018-11-18 16:15:35 -07:00
parent aa61bec30e
commit 4ab32bf330
1 changed files with 6 additions and 1 deletions
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7
block/blk-mq.c
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@ -585,7 +585,12 @@ static void __blk_mq_complete_request(struct request *rq)
return;
}
if (!test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags)) {
/*
* For a polled request, always complete locallly, it's pointless
* to redirect the completion.
*/
if ((rq->cmd_flags & REQ_HIPRI) ||
!test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags)) {
q->mq_ops->complete(rq);
return;
}