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

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Date:	Wed, 5 Nov 2014 11:29:29 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
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

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)?  It's weird to expose extra stuff on top.  Why are
we doing that?

Thanks.

-- 
tejun
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