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Date:	Tue, 09 Sep 2014 22:48:29 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Tejun Heo <tj@...nel.org>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Cong Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch v4 1/2] freezer: check OOM kill while being frozen

On Wednesday, September 10, 2014 12:23:36 AM Tejun Heo wrote:
> On Tue, Sep 09, 2014 at 05:16:55PM +0200, Michal Hocko wrote:
> > But OOM killer doesn't kill kernel threads as they do not own any
> > memory. So the check should be safe, no?
> 
> Even for userland tasks, try_to_freeze() can currently be anywhere in
> the kernel.  The frequently used ones are few but there are some odd
> ones out, and, again, there's nothing enforcing any structure on
> try_to_freeze() usage.  The other thing is that we may do quite a bit
> during exiting including allocating memory.  Are those safe for system
> PM?  Rafael, what exactly are the rules for PM?  What shouldn't
> change?

We can't make any assumptions regarding the availability of any devices.
That is, whatever can end up in device access may potentially fail.

Rafael

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