linux-kernel - Re: [patch 6/7] blk: add plug for blkdev_issue

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Message-ID: <20120313155120.GG29169@redhat.com>
Date:	Tue, 13 Mar 2012 11:51:20 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Shaohua Li <shli@...ionio.com>
Cc:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	neilb@...e.de, axboe@...nel.dk, Shaohua Li <shli@...ionio.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [patch 6/7] blk: add plug for blkdev_issue_discard

On Mon, Mar 12, 2012 at 11:04:18AM +0800, Shaohua Li wrote:
> In raid 0 case, a big discard request is divided into several small requests
> in chunk_size unit. Such requests can be merged in low layer if we have
> correct plug added. This should improve the performance a little bit.

Martin posted a patch to remove the support for allowing merging of discard
requests. But this seems to be a reasonable use case for allowing mering
discard requests. CCing Martin.

Thanks
Vivek
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