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

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Message-ID: <20100402205535.GA4842@redhat.com>
Date:	Fri, 2 Apr 2010 22:55:35 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	David Rientjes <rientjes@...gle.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 04/02, David Rientjes wrote:
>
> On Fri, 2 Apr 2010, Oleg Nesterov wrote:
> >
> > > 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.

OK, agreed, this makes more sense and more clean. I misunderstood you even
more before.

Thanks, I'll redo/resend 3/4.

Oleg.

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