Re: x86_64: 2.6.14 with NUMA panics at boot

["Martin J. Bligh" <mbligh@mbligh.org>]

--Andi Kleen <ak@suse.de> wrote (on Monday, October 31, 2005 03:12:17 +0100):

> On Monday 31 October 2005 01:17, Bob Picco wrote:
> 
>> This is a slightly modified patch I used on x86_64 for EXTREME testing. The
>> original 2.6.13-rc1-mhp1 patch didn't apply cleanly against 2.6.14. It will
>> apply with this untested patch.  The patch needs to have arch_sparse_init
>> which is only active for SPARSEMEM. This patch was just for testing EXTREME
>> on x86_64 NUMA and needs review.
>> 
>> I think the bootmem allocator is being used before initialized.  This
>> wouldn't have happened before SPARSEMEM_EXTREME became the default.
>> 
>> If you feel my analysis is correct, I'll generate a cleaner patch and
>> test on my 4 way.
> 
> Ok the question is - why did nobody submit this patch in time? When
> sparse was merged I assumed folks would actually test and maintain
> it. But that doesn't seem to be the case? Somewhat surprising.
> 
> I personally don't care much about sparsemem right now because it doesn't have 
> any advantage and if it's unmaintained would consider to mark it 
> CONFIG_BROKEN. That's simply because we can't have highly experimental 
> CONFIGs in a production kernel that unsuspecting users can just set and break 
> their configuration.
> 
> Dave, is there someone in charge for sparsemem on x86-64?

Sparsemem is Andy's baby. He is duly cc'ed.

M.



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