linux-kernel - Re: [PATCH] MD: make bio mergeable

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Message-ID: <571EBD56.7010204@kernel.dk>
Date:	Mon, 25 Apr 2016 18:59:02 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Shaohua Li <shli@...com>, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Cc:	qkrwngud825@...il.com, Kernel-team@...com,
	"v4.3+" <stable@...r.kernel.org>,
	Ming Lei <ming.lei@...onical.com>, Jens Axboe <axboe@...com>,
	Neil Brown <neilb@...e.de>
Subject: Re: [PATCH] MD: make bio mergeable

On 04/25/2016 05:52 PM, Shaohua Li wrote:
> blk_queue_split marks bio unmergeable, which makes sense for normal bio.
> But if dispatching the bio to underlayer disk, the blk_queue_split
> checks are invalid, hence it's possible the bio becomes mergeable.
>
> In the reported bug, this bug causes trim against raid0 performance slash
> https://bugzilla.kernel.org/show_bug.cgi?id=117051

Good catch! Will apply for this series, thanks Shaohua.

-- 
Jens Axboe