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

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Message-Id: <20101012111451.AD2E.A69D9226@jp.fujitsu.com>
Date:	Tue, 12 Oct 2010 11:17:04 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	kosaki.motohiro@...fujitsu.com, Christoph Lameter <cl@...ux.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.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.

Right. but do we need to consider fake SLIT case? I know actually such bogus
slit are there. but I haven't seen such fake SLIT made serious trouble.



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