linux-kernel - Re: [patch] oom: thaw threads if oom killed thread is frozen before deferring

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Message-ID: <20110930074641.GK10425@mtj.dyndns.org>
Date:	Fri, 30 Sep 2011 00:46:41 -0700
From:	Tejun Heo <htejun@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch] oom: thaw threads if oom killed thread is frozen before
 deferring

Hello,

On Fri, Sep 30, 2011 at 09:41:25AM +0200, Michal Hocko wrote:
> > With pending freezer changes, allowing TIF_MEMDIE tasks to exit
> > freezer by modifying freezing() shouldn't be difficult, which should
> > be race-free and much simpler than diddling with thaw_task().  
> 
> Will the rework help with the initial problem of unkillable OOM selected
> frozen tasks or it will just help with other races that might be present
> with the patch? In other words will this work deprecate the 2 patches
> sent earlier in this thread?

I think it shouldn't be difficult to allow OOM-killing frozen tasks.
That should be good enough, right?

> > How urgent is this?  Can we wait for the next merge window?
> 
> Yes, I think we can wait some more.

I'm still processing rather large backlog.  I'll ping you back once I
sort out the pending freezer changes.

Thanks.

-- 
tejun
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