linux-kernel - Re: [PATCH v1 3/6] blk-mq: check bio

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Date:	Mon, 19 Oct 2015 11:11:53 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	Ming Lin <ming.l@....samsung.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v1 3/6] blk-mq: check bio_mergeable() early before merging

Ming Lei <ming.lei@...onical.com> writes:

> It isn't necessary to try to merge the bio which is marked
> as NOMERGE.
>
> Signed-off-by: Ming Lei <ming.lei@...onical.com>

Reviewed-by: Jeff Moyer <jmoyer@...hat.com>

> ---
>  block/blk-mq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index 546b3b8..d55d022 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -1140,7 +1140,7 @@ static inline bool blk_mq_merge_queue_io(struct blk_mq_hw_ctx *hctx,
>  					 struct blk_mq_ctx *ctx,
>  					 struct request *rq, struct bio *bio)
>  {
> -	if (!hctx_allow_merges(hctx)) {
> +	if (!hctx_allow_merges(hctx) || !bio_mergeable(bio)) {
>  		blk_mq_bio_to_request(rq, bio);
>  		spin_lock(&ctx->lock);
>  insert_rq:
--
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