linux-kernel - Re: 32bit NUMA and fakeNUMA broken for AMD CPUs

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Message-ID: <20110629125507.GQ478@escobedo.osrc.amd.com>
Date:	Wed, 29 Jun 2011 14:55:08 +0200
From:	Hans Rosenfeld <hans.rosenfeld@....com>
To:	Tejun Heo <tj@...nel.org>
CC:	"Seidel, Conny" <Conny.Seidel@....com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 32bit NUMA and fakeNUMA broken for AMD CPUs

On Wed, Jun 29, 2011 at 08:34:09AM -0400, Tejun Heo wrote:
> So, mminit_verify_page_links() detects it while the last 512MiB
> highmem chunk of node 0 is being initialized and freaks out.
> 
> We definitely need a safe guard to check NUMA node alignment and
> disable NUMA if it requires finer granuality than supported by the
> memory model.  If you use DISCONTIGMEM, which has 64MiB granuality,
> instead, it works, right?

I had DISCONTIGMEM enabled in the kernel config, it does not work.

Hans


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