From: Andi Kleen <ak@suse.de>
To: discuss@x86-64.org
Subject: Re: [discuss] mmap, mbind and write to mmap'ed memory crashes 2.6.16-rc1[2] on 2 node X86_64
Date: Wed, 8 Feb 2006 17:27:31 +0100
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Cc: Christoph Lameter <clameter@engr.sgi.com>,
       Bharata B Rao <bharata@in.ibm.com>,
       Ray Bryant <raybry@mpdtxmail.amd.com>, linux-kernel@vger.kernel.org
References: <20060205163618.GB21972@in.ibm.com> <200602081706.26853.ak@suse.de> <Pine.LNX.4.62.0602080816560.2289@schroedinger.engr.sgi.com>
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On Wednesday 08 February 2006 17:20, Christoph Lameter wrote:
> On Wed, 8 Feb 2006, Andi Kleen wrote:
> 
> > > So a provisional solution would be to simply ignore empty zones in 
> > > bind_zonelist?
> > 
> > That would likely prevent the crash yes (Bharata can you test?)
> > 
> > But of course it still has the problem of a lot of memory being unpolicied
> > on machines with >4GB if there's both DMA32 and NORMAL.
> 
> The fix could result in a zonelist with no zones. So we can answer one 
> question in __alloc_pages().

I don't think it can happen - at least one zone <= policy-zone has to 
have memory otherwise the machine wouldn't work at all.

-Andi
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