linux-kernel - Re: [PATCH 4/7] cgroup_freezer: don't stall transition to FROZEN for PF_NOFREEZE or PF_FREEZER

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Date:	Tue, 23 Oct 2012 17:55:33 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	rjw@...k.pl, linux-kernel@...r.kernel.org, lizefan@...wei.com,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org
Subject: Re: [PATCH 4/7] cgroup_freezer: don't stall transition to FROZEN
	for PF_NOFREEZE or PF_FREEZER_SKIP tasks

On 10/22, Tejun Heo wrote:
>
> On Mon, Oct 22, 2012 at 08:34:53PM +0200, Oleg Nesterov wrote:
> >
> > Hmm. We seem to "leak" PF_NOFREEZE if a kernel thread execs?
> > Perhaps do_execve_common() should do set_freezable() before return.
> >
> > Or, at least, simply clear this flag along with PF_KTHREAD in
> > flush_old_exec().
>
> Ooh, ouch, definitely.  We should clear that.  Can you please make a
> patch?

Sure... but what do you think is better?

I'd prefer to simply clear PF_NOFREEZE (without set_freezable), but
obviously this doesn't look exactly right from cgroup_freezer pov.

Oleg.

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