linux-kernel - Re: 32/64-bit NUMA consolidation behavior regresion

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Message-ID: <50B91D54.2080507@linux.vnet.ibm.com>
Date:	Fri, 30 Nov 2012 12:55:48 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: Re: 32/64-bit NUMA consolidation behavior regresion

On 11/30/2012 12:42 PM, Tejun Heo wrote:
> On Wed, Nov 28, 2012 at 04:03:58PM -0800, Dave Hansen wrote:
>> My system is just qemu booted with:
>>
>> -smp 8 -m 8192 -numa node,nodeid=0,cpus=0-3 -numa node,nodeid=1,cpus=4-7
>>
>> Watch the "PERCPU:" line early in boot, and you can see the "Embedded"
>> come and go with or without your patch:
>>
>> [    0.000000] PERCPU: Embedded 11 pages/cpu @f3000000 s30592 r0 d14464
>> vs
>> [    0.000000] PERCPU: 11 4K pages/cpu @f83fe000 s30592 r0 d14464
> ...
>> I don't have a fix handy because I'm working on the original problem,
>> but I just happened to run across this during a bisect.
> 
> Just tested 3.7-rc7 w/ qemu and it works as expected here.
> 
> Can you please boot with the following debug patch and report the boot
> message before and after?

Hi Tejun,

I just tested with 3.7-rc7 and I'm seeing the expected behavior now.
Looks like it got fixed along the way somewhere.  I was bisecting way
back in the 2.6.3x's.  Sorry of the noise.

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