linux-kernel - Re: [PATCH] 2.6.23-rc1-mm1 - fix missing numa_zonelist

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Message-ID: <20070802161437.GA22493@skynet.ie>
Date:	Thu, 2 Aug 2007 17:14:37 +0100
From:	mel@...net.ie (Mel Gorman)
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH] 2.6.23-rc1-mm1 - fix missing numa_zonelist_order sysctl

On (02/08/07 09:44), KAMEZAWA Hiroyuki didst pronounce:
> On Wed, 01 Aug 2007 15:02:51 -0400
> Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:
> > [But, maybe reordering the zonelists is not such a good idea
> > when ZONE_MOVABLE is populated?]
> > 
> 
> It's case-by-case I think. In zone order with ZONE_MOVABLE case,
> user's page cache will not use ZONE_NORMAL until ZONE_MOVABLE in all node
> is exhausted. This is an expected behavior, I think.
> 

This is expected behaviour. I see no reason for lower zones to be used
for allocations that use memory from a higher zone with free memory.

> I think the real problem is the scheme for "How to set zone movable size to
> appropriate value for the system". This needs more study and documentation.
> (but maybe depends on system configuration to some extent.)
> 

It depends on the system configuration and the workload requirements.
Right now, there isn't exact information available on what size the zone
should be. It'll need to be studied over a period of time.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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