linux-kernel - Re: [patch] oom: give current access to memory reserves if it has been killed

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Message-ID: <alpine.DEB.2.00.1004021244010.15445@chino.kir.corp.google.com>
Date:	Fri, 2 Apr 2010 12:46:32 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Oleg Nesterov <oleg@...hat.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	anfei <anfei.zhou@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	nishimura@....nes.nec.co.jp,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] oom: give current access to memory reserves if it has
 been killed

On Fri, 2 Apr 2010, Oleg Nesterov wrote:

> > > David, you continue to ignore my arguments ;) select_bad_process()
> > > must not filter out the tasks with ->mm == NULL.
> > >
> > I'm not ignoring your arguments, I think you're ignoring what I'm
> > responding to.
> 
> Ah, sorry, I misunderstood your replies.
> 
> > I prefer to keep oom_badness() to be a positive range as
> > it always has been (and /proc/pid/oom_score has always used an unsigned
> > qualifier),
> 
> Yes, I thought about /proc/pid/oom_score, but imho this is minor issue.
> We can s/%lu/%ld/ though, or just report 0 if oom_badness() returns -1.
> Or something.
> 

Just have it return 0, meaning never kill, and then ensure "chosen" is 
never set for an oom_badness() of 0, even if we don't have another task to 
kill.  That's how Documentation/filesystems/proc.txt describes it anyway.
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