linux-kernel - Re: [PATCH 08/12] blkcg: use the usual get blkg path for root blkio

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Message-ID: <20120119161742.GF5198@google.com>
Date:	Thu, 19 Jan 2012 08:17:42 -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 08/12] blkcg: use the usual get blkg path for root
 blkio_group

Hello,

On Thu, Jan 19, 2012 at 09:41:36AM -0500, Vivek Goyal wrote:
> > This simplifies root blkg handling noticeably for cfq and will allow
> > further modularization of blkcg API.
> 
> Does this work if BLK_CGROUP=n?
> 
> I am trying to think that why did I keep allocating root cgroup statically
> for CFQ. May be the reason was that this group was present even if
> CFQ_GROUP_IOSCHED=n. There was other code which assumed a group to be
> always present and I did not want to put more #ifdef.
> 
> Anyway, if it works well, with BLK_CGROUP=n, then it is fine.

Right, it's currently broken but it shouldn't be too difficult to fix.
Will update the patch.

Thanks.

-- 
tejun
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