linux-kernel - Re: [PATCH 9/9] cgroup_freezer: implement proper hierarchy support

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Message-ID: <20121107163144.GB2660@mtj.dyndns.org>
Date:	Wed, 7 Nov 2012 08:31:44 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	lizefan@...wei.com, rjw@...k.pl,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	fweisbec@...il.com
Subject: Re: [PATCH 9/9] cgroup_freezer: implement proper hierarchy support

Hello, Michal.

On Wed, Nov 07, 2012 at 12:00:57PM +0100, Michal Hocko wrote:
> > +	 * Update all its descendants in pre-order traversal.  Each
> > +	 * descendant will try to inherit its parent's FREEZING state as
> > +	 * CGROUP_FREEZING_PARENT.
> > +	 */
> > +	rcu_read_lock();
> > +	cgroup_for_each_descendant_pre(pos, freezer->css.cgroup) {
> > +		struct freezer *pos_f = cgroup_freezer(pos);
> > +		struct freezer *parent = parent_freezer(freezer);
> 
> This doesn't seem right. Why are we interested in freezer->parent here
> at all? We should either care about freezer->state & CGROUP_FREEZING or
> parent = parent_freezer(pos_f), right?

Yeap, that should have been parent_freezer(pos_f).  Argh...

Thanks.

-- 
tejun
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