linux-kernel - Re: [PATCH 4/8] cgroup: deactivate CSS's and mark cgroup dead before invoking ->pre

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Message-ID: <20121101085832.GB8525@dhcp22.suse.cz>
Date:	Thu, 1 Nov 2012 09:58:32 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	lizefan@...wei.com, hannes@...xchg.org, bsingharora@...il.com,
	kamezawa.hiroyu@...fujitsu.com,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, Glauber Costa <glommer@...allels.com>
Subject: Re: [PATCH 4/8] cgroup: deactivate CSS's and mark cgroup dead before
 invoking ->pre_destroy()

On Wed 31-10-12 14:27:25, Tejun Heo wrote:
> Hey, Michal.
> 
> On Wed, Oct 31, 2012 at 10:23:59PM +0100, Michal Hocko wrote:
> > > +	for_each_subsys(cgrp->root, ss)
> > > +		if (ss->pre_destroy)
> > > +			WARN_ON_ONCE(ss->pre_destroy(cgrp));
> > 
> > Do you think that BUG_ON would be too harsh?
> 
> Yeah, I do think so.  In general, I think the consensus now is to
> prefer WARN_ON[_ONCE]() over BUG_ON() whenever possible.  It's not
> like we can get more information from BUG_ON()s (more likely to get
> less reporting actually by taking down the machine).  Limping machines
> are better than dead ones and there just isn't much to gain here by
> killing it.

Fair enough

-- 
Michal Hocko
SUSE Labs
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