linux-kernel - Re: [resend][PATCH] mm: increase RECLAIM

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Message-ID: <alpine.DEB.2.00.1010111907190.27825@chino.kir.corp.google.com>
Date:	Mon, 11 Oct 2010 19:11:25 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux.com>
cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, Rob Mueller <robm@...tmail.fm>,
	linux-kernel@...r.kernel.org, Bron Gondwana <brong@...tmail.fm>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [resend][PATCH] mm: increase RECLAIM_DISTANCE to 30

On Fri, 8 Oct 2010, Christoph Lameter wrote:

> It implies that zone reclaim is going to be automatically enabled if the
> maximum latency to the memory farthest away is 3 times or more that of a
> local memory access.
> 

It doesn't determine what the maximum latency to that memory is, it relies 
on whatever was defined in the SLIT; the only semantics of that distance 
comes from the ACPI spec that states those distances are relative to the 
local distance of 10.
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