linux-kernel - Re: [PATCH] badness() dramatically overcounts memory

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Message-ID: <alpine.DEB.1.00.0802051802460.18339@chino.kir.corp.google.com>
Date:	Tue, 5 Feb 2008 18:05:46 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Jeff Davis <linux@...avis.com>, balbir@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrea Arcangeli <andrea@...ranet.com>
Subject: Re: [PATCH] badness() dramatically overcounts memory

On Wed, 6 Feb 2008, KOSAKI Motohiro wrote:

> > Andrea Arcangeli has patches pending which change this to the RSS.  
> > Specifically:
> > 
> > 	http://marc.info/?l=linux-mm&m=119977937126925
> 
> I agreed with you that RSS is better :)
> 
> 
> 
> but..
> on many node numa, per zone rss is more better..
> 

It depends on how your applications are taking advantage of NUMA 
optimizations.  If they're constrained by mempolicies to a subset of nodes 
then the badness scoring isn't even used: the task that triggered the OOM 
condition is the one that is automatically killed.

At this point, I think you're going to need to present an actual case 
study where Andrea's patch isn't sufficient for selecting the appropriate 
task on large NUMA machines.

		David
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