linux-kernel - Re: [PATCH v5 00/11] simplify block layer based on immutable biovecs

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Message-ID: <x498uagtfci.fsf@segfault.boston.devel.redhat.com>
Date:	Thu, 16 Jul 2015 09:13:49 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Ming Lin <mlin@...nel.org>
Cc:	Mike Snitzer <snitzer@...hat.com>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Dongsu Park <dpark@...teo.net>, NeilBrown <neilb@...e.de>,
	"Alasdair G. Kergon" <agk@...hat.com>, dm-devel@...hat.com
Subject: Re: [PATCH v5 00/11] simplify block layer based on immutable biovecs

Ming Lin <mlin@...nel.org> writes:

> On Mon, 2015-07-13 at 11:35 -0400, Mike Snitzer wrote:
>> I will do additional review to answer 1 and 2 above.  And Jeff Moyer
>> told me he'd test the patchset on one of his testbeds.
>
> Hi Jeff,
>
> FYI, here is a fix for patch 1.
> Or you can pull from my tree.
> https://git.kernel.org/cgit/linux/kernel/git/mlin/linux.git/log/?h=block-generic-req

Thanks, Ming.  I'll let you know as soon as I have results worth sharing.

Cheers,
Jeff

>
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index 40d08e3..181f343 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -1287,12 +1287,12 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
>  		return;
>  	}
>  
> +	blk_queue_split(q, &bio, q->bio_split);
> +
>  	if (!is_flush_fua && !blk_queue_nomerges(q) &&
>  	    blk_attempt_plug_merge(q, bio, &request_count, &same_queue_rq))
>  		return;
>  
> -	blk_queue_split(q, &bio, q->bio_split);
> -
>  	rq = blk_mq_map_request(q, bio, &data);
>  	if (unlikely(!rq))
>  		return;
> @@ -1374,12 +1374,12 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
>  		return;
>  	}
>  
> +	blk_queue_split(q, &bio, q->bio_split);
> +
>  	if (!is_flush_fua && !blk_queue_nomerges(q) &&
>  	    blk_attempt_plug_merge(q, bio, &request_count, NULL))
>  		return;
>  
> -	blk_queue_split(q, &bio, q->bio_split);
> -
>  	rq = blk_mq_map_request(q, bio, &data);
>  	if (unlikely(!rq))
>  		return;
--
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