linux-kernel - Re: [PATCH] change zonelist order v5 [1/3] implements zonelist order selection

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Date:	Wed, 09 May 2007 09:55:43 -0400
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, clameter@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, ak@...e.de,
	jbarnes@...tuousgeek.org
Subject: Re: [PATCH] change zonelist order v5 [1/3] implements zonelist
	order selection

On Wed, 2007-05-09 at 10:20 +0900, KAMEZAWA Hiroyuki wrote:
> On Tue, 8 May 2007 17:58:55 -0700
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > On Wed, 9 May 2007 09:29:12 +0900
> > KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > 
> > > On Tue, 08 May 2007 16:37:06 -0400
> > > Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:
> > > 
> > > > > You probably need a 
> > > > > configuration with a couple of nodes. Maybesomething less symmetric than 
> > > > > Kame? I.e. have 4GB nodes and then DMA32 takes out a sizeable chunk of it?
> > > > > 
> > > > 
> > > > I tested on a 2 socket, 4GB Opteron blade.  All memory is either DMA32
> > > > or DMA.  I added some ad hoc instrumentation to the build_zonelist_*
> > > > functions to see what's happening.  I have verified that the patches
> > > > appear to build the zonelists correctly:
> > > > 
> > > Thank you. good news.
> > > 
> > 
> > I'm still cowering in fear of these patches, btw.
> > 
> Hmm, the patches looks unclear ? 
> 
> > Please keep testing and sending them ;)
> > 
> Okay. but it seems I need other testers...
> 
> I wonder I should drop sysctl of this patch and just support boot option
> in next version.

I think the system still need to be able to rebuild the zonelists at
run-time in response to memory hotplug [someday, maybe?].  And for now,
the sysctl is very useful for testing.  And, it does avoid a
reboot--quite expensive, timewise, on large platforms--should one find
that the default order is not appropriate.  

Lee

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