linux-kernel - Re: Mysterious CFQ crash and RCU

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Message-ID: <1306316425.9059.23.camel@t41.thuisdomein>
Date:	Wed, 25 May 2011 11:40:25 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: Mysterious CFQ crash and RCU

On Wed, 2011-05-25 at 11:30 +0200, Jens Axboe wrote:
> If you build CFQ modular, then all you have to do is switch to using CFQ
> before starting your testing:
> 
> # echo cfq > /sys/block/sda/queue/scheduler
> 
> and switch sda to eg noop before you can remove cfq-iosched again. As
> long as things crash, then you wont be able to remove cfq anyway and you
> have to reboot to test something new anyway. So the modular nature of
> cfq-iosched may not help you all that much in the end.

The main advantage I hope for is to reduce build and install time (it's
much quicker to rebuild a module, copy it into /lib/modules, perhaps
upgrade the initramfs, etc., than it is to rebuild an entire kernel, all
its modules, etc.).


Paul

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