linux-kernel - Re: [PATCH -v2 5/5] OOM, PM: make OOM detection in the freezer path raceless

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Message-ID: <20150107184847.GH16553@dhcp22.suse.cz>
Date:	Wed, 7 Jan 2015 19:48:47 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	"\\\"Rafael J. Wysocki\\\"" <rjw@...ysocki.net>,
	David Rientjes <rientjes@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pm@...r.kernel.org
Subject: Re: [PATCH -v2 5/5] OOM, PM: make OOM detection in the freezer path
 raceless

On Wed 07-01-15 13:41:24, Tejun Heo wrote:
> Hello, Michal.  Sorry about the long delay.
> 
> On Fri, Dec 05, 2014 at 05:41:47PM +0100, Michal Hocko wrote:
> ...
> > @@ -252,6 +220,8 @@ void thaw_kernel_threads(void)
> >  {
> >  	struct task_struct *g, *p;
> >  
> > +	oom_killer_enable();
> > +
> 
> Wouldn't it be more symmetrical and make more sense to enable oom
> killer after kernel threads are thawed?  Until kernel threads are
> thawed, it isn't guaranteed that oom killer would be able to make
> forward progress, right?

Makes sense, fixed.

> Other than that, looks good to me.

Thanks! Btw. I plan to repost after Andrew releases new mmotm as there
are some dependencies in oom area.
-- 
Michal Hocko
SUSE Labs
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