linux-kernel - Re: [PATCH v3] mm: make expand_downwards symmetrical to expand

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Message-ID: <20110420112020.GA31296@parisc-linux.org>
Date:	Wed, 20 Apr 2011 05:20:20 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-parisc@...r.kernel.org, David Rientjes <rientjes@...gle.com>,
	Ingo Molnar <mingo@...e.hu>, x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to
	expand_upwards

On Wed, Apr 20, 2011 at 10:34:23AM +0300, Pekka Enberg wrote:
> That part makes me think the best option is to make parisc do
> CONFIG_NUMA as well regardless of the historical intent was.

But it's not just parisc.  It's six other architectures as well, some
of which aren't even SMP.  Does !SMP && NUMA make any kind of sense?

I think really, this is just a giant horrible misunderstanding on the part
of the MM people.  There's no reason why an ARM chip with 16MB of memory
at 0 and 16MB of memory at 1GB should be saddled with all the NUMA gunk.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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