linux-kernel - Re: [PATCH 21/24] blkcg: make blkcg_print_blkgs() grab q locks instead of blkcg lock

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Message-ID: <20130108180804.GC29933@redhat.com>
Date:	Tue, 8 Jan 2013 13:08:04 -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 21/24] blkcg: make blkcg_print_blkgs() grab q locks
 instead of blkcg lock

On Fri, Dec 28, 2012 at 12:35:43PM -0800, Tejun Heo wrote:
> Instead of holding blkcg->lock while walking ->blkg_list and executing
> prfill(), RCU walk ->blkg_list and hold the blkg's queue lock while
> executing prfill().  This makes prfill() implementations easier as
> stats are mostly protected by queue lock.
> 
> This 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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