linux-kernel - Re: [PATCH -mm 13/25] Noreclaim LRU Infrastructure

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Date:	Tue, 10 Jun 2008 15:05:35 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>, clameter@....com,
	linux-kernel@...r.kernel.org, lee.schermerhorn@...com,
	kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org,
	eric.whitney@...com, Paul Mundt <lethal@...ux-sh.org>,
	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Andy Whitcroft <apw@...dowen.org>
Subject: Re: [PATCH -mm 13/25] Noreclaim LRU Infrastructure

On Tue, 2008-06-10 at 14:33 -0700, Andrew Morton wrote:
> Maybe it's time to bite the bullet and kill i386 NUMA support.  afaik
> it's just NUMAQ and a 2-node NUMAish machine which IBM made (as400?)

Yeah, IBM sold a couple of these "interesting" 32-bit NUMA machines:

https://www.redbooks.ibm.com/Redbooks.nsf/RedbookAbstracts/tips0267.html?Open

I think those maxed out at 8 nodes, ever.  But, no distro ever turned
NUMA on for i386, so no one actually depends on it working.  We do have
a bunch of systems that we use for testing and so forth.  It'd be a
shame to make these suck *too* much.  The NUMA-Q is probably also so
intertwined with CONFIG_NUMA that we'd likely never get it running
again.

I'd rather just bloat page->flags on these platforms or move the
sparsemem/zone/node bits elsewhere than kill NUMA support.  

-- Dave

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