linux-kernel - Re: [PATCH v4] zone_reclaim is always 0 by default

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Message-ID: <20090609095507.GA9851@attica.americas.sgi.com>
Date:	Tue, 9 Jun 2009 04:55:07 -0500
From:	Robin Holt <holt@....com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Robin Holt <holt@....com>,
	"Zhang, Yanmin" <yanmin.zhang@...el.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-ia64@...r.kernel.org, linuxppc-dev@...abs.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v4] zone_reclaim is always 0 by default

On Mon, Jun 08, 2009 at 12:50:48PM +0100, Mel Gorman wrote:

Let me start by saying I agree completely with everything you wrote and
still disagree with this patch, but was willing to compromise and work
around this for our upcoming x86_64 machine by putting a "value add"
into our packaging of adding a sysctl that turns reclaim back on.

...
> > Index: b/arch/powerpc/include/asm/topology.h
> > ===================================================================
> > --- a/arch/powerpc/include/asm/topology.h
> > +++ b/arch/powerpc/include/asm/topology.h
> > @@ -10,6 +10,12 @@ struct device_node;
> >  
> >  #include <asm/mmzone.h>
> >  
> > +/*
> > + * Distance above which we begin to use zone reclaim
> > + */
> > +#define RECLAIM_DISTANCE 20
> > +
> > +
> 
> Where is the ia-64-specific modifier to RECAIM_DISTANCE?

It was already defined as 15 in arch/ia64/include/asm/topology.h

Thanks,
Robin
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