linux-kernel - Re: [PATCH v5 2/5] block: loop: set QUEUE_FLAG

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Message-ID: <20150610073603.GB6964@infradead.org>
Date:	Wed, 10 Jun 2015 00:36:03 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	linux-kernel@...r.kernel.org,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Jens Axboe <axboe@...nel.dk>, Zach Brown <zab@...bo.net>,
	Christoph Hellwig <hch@...radead.org>,
	Maxim Patlasov <mpatlasov@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Tejun Heo <tj@...nel.org>, Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH v5 2/5] block: loop: set QUEUE_FLAG_NOMERGES for request
 queue of loop

On Tue, Jun 09, 2015 at 09:49:23PM +0800, Ming Lei wrote:
> It doesn't make sense to enable merge because the I/O
> submitted to backing file is handled page by page.

Looks fine, but does it make any difference?

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