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

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Message-Id: <20110420102314.4604.A69D9226@jp.fujitsu.com>
Date:	Wed, 20 Apr 2011 10:23:35 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Pekka Enberg <penberg@...nel.org>,
	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>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards

> On Tue, 19 Apr 2011, James Bottomley wrote:
> 
> > > Which part of me telling you that you will break lots of other things in
> > > the core kernel dont you get?
> >
> > I get that you tell me this ... however, the systems that, according to
> > you, should be failing to get to boot prompt do, in fact, manage it.
> 
> If you dont use certain subsystems then it may work. Also do you run with
> debuggin on.
> 
> The following patch is I think what would be needed to fix it.

I'm worry about this patch. A lot of mm code assume !NUMA systems 
only have node 0. Not only SLUB.

I'm not sure why this unfortunate mismatch occur. but I think DISCONTIG
hacks makes less sense. Can we consider parisc turn NUMA on instead?



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