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

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Message-Id: <20101012130806.AD37.A69D9226@jp.fujitsu.com>
Date:	Tue, 12 Oct 2010 13:07:35 +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 Tue, 12 Oct 2010, KOSAKI Motohiro wrote:
> 
> > > 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.
> > 
> 
> If we can make the assumption that the SLIT entries are truly 
> representative of the latencies and are adhering to the semantics 
> presented in the ACPI spec, then this means the VM prefers to do zone 
> reclaim rather than from other nodes when the latter is 3x more costly.
> 
> That's fine by me, as I've mentioned we've done this for a couple years 
> because we've had to explicitly disable zone_reclaim_mode for such 
> configurations.  If that's the policy decision that's been made, though, 
> we _could_ measure the cost at boot and set zone_reclaim_mode depending on 
> the measured latency rather than relying on the SLIT at all in this case.

ok, got it. thanks.



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