linux-kernel - Re: [PATCH 3/4] OOM, PM: OOM killed task shouldn't escape PM suspend

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Message-ID: <20141105163956.GD28226@dhcp22.suse.cz>
Date:	Wed, 5 Nov 2014 17:39:56 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cong Wang <xiyou.wangcong@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 3/4] OOM, PM: OOM killed task shouldn't escape PM suspend

On Wed 05-11-14 11:29:29, Tejun Heo wrote:
> Hello, Michal.
> 
> On Wed, Nov 05, 2014 at 05:01:15PM +0100, Michal Hocko wrote:
> > I am not sure I am following. With the latest patch OOM path is no
> > longer blocked by the PM (aka oom_killer_disable()). Allocations simply
> > fail if the read_trylock fails.
> > oom_killer_disable is moved before tasks are frozen and it will wait for
> > all on-going OOM killers on the write lock. OOM killer is enabled again
> > on the resume path.
> 
> Sure, but why are we exposing new interfaces?  Can't we just make
> oom_killer_disable() first set the disable flag and wait for the
> on-going ones to finish (and make the function fail if it gets chosen
> as an OOM victim)?

Still not following. How do you want to detect an on-going OOM without
any interface around out_of_memory?
-- 
Michal Hocko
SUSE Labs
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