linux-kernel - Re: [RFC, PATCH] cfq-iosched: remove redundant queuing detection code

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Date:	Tue, 10 Nov 2009 16:14:31 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Corrado Zoccolo <czoccolo@...il.com>
Cc:	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Jeff Moyer <jmoyer@...hat.com>, aaronc@...ato.unsw.edu.au
Subject: Re: [RFC, PATCH] cfq-iosched: remove redundant queuing detection
	code

On Tue, Nov 10 2009, Corrado Zoccolo wrote:
> The core block layer already has code to detect presence of command
> queuing devices. We convert cfq to use that instead of re-doing the
> computation.

There's is the major difference that the CFQ variant is dynamic and the
block layer one is not. This change came from Aaron some time ago IIRC,
see commit 45333d5. It's a bit of a chicken and egg problem.

-- 
Jens Axboe

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