linux-kernel - Re: [PATCH 08/17] blkcg: shoot down blkio

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Message-ID: <20120123185153.GJ12652@google.com>
Date:	Mon, 23 Jan 2012 10:51:53 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/17] blkcg: shoot down blkio_groups on elevator switch

On Mon, Jan 23, 2012 at 01:32:07PM -0500, Vivek Goyal wrote:
> This is not just specific to blk-throttle. If in future throttling policy
> is removable like elevator, then it will be fine to reset the throttling
> related configuration upon removal of throttling policy. But resetting
> throttling configuration without policy going anywhere does not sound good.

Yeah, that is a compromise.  As long as those configurations are
per-queue, which is the way it's gonna be after the clean up, I don't
think it's a big deal tho.  We'll be saying "if you make changes to
the set of blkcg policies applied to a device, all blkcg
configurations regarding the device will be reset" instead of "if any
change to blkcg policies happen system-wide, all blkcg configurations
will be reset", and the former doesn't sound crazy to me.  Anyways,
let's see how complex doing the finer grained thing gets.

-- 
tejun
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