linux-kernel - Re: [PATCH 17/24] blkcg: implement blkcg_policy->on/offline_pd_fn() and blkcg

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Date:	Tue, 8 Jan 2013 11:58:53 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	lizefan@...wei.com, axboe@...nel.dk,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, ctalbott@...gle.com, rni@...gle.com
Subject: Re: [PATCH 17/24] blkcg: implement blkcg_policy->on/offline_pd_fn()
 and blkcg_gq->online

On Fri, Dec 28, 2012 at 12:35:39PM -0800, Tejun Heo wrote:
> Add two blkcg_policy methods, ->online_pd_fn() and ->offline_pd_fn(),
> which are invoked as the policy_data gets activated and deactivated
> while holding both blkcg and q locks.
> 
> Also, add blkcg_gq->online bool, which is set and cleared as the
> blkcg_gq gets activated and deactivated.  This flag also is toggled
> while holding both blkcg and q locks.
> 
> These will be used to implement hierarchical stats.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> ---

Acked-by: Vivek Goyal <vgoyal@...hat.com>

Vivek
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