linux-kernel - Re: [RFC PATCH 0/3] Fix SLQB on memoryless configurations V2

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Date:	Tue, 22 Sep 2009 18:35:05 +0530
From:	Sachin Sant <sachinp@...ibm.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	heiko.carstens@...ibm.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Tejun Heo <tj@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [RFC PATCH 0/3] Fix SLQB on memoryless configurations V2

Mel Gorman wrote:
> On Tue, Sep 22, 2009 at 10:33:11AM +0530, Sachin Sant wrote:
>   
>> Mel Gorman wrote:
>>     
>>> On Mon, Sep 21, 2009 at 01:54:12PM -0400, Christoph Lameter wrote:
>>>   
>>>       
>>>> Lets just keep SLQB back until the basic issues with memoryless nodes are
>>>> resolved.
>>>>     
>>>>         
>>> It's not even super-clear that the memoryless nodes issues are entirely
>>> related to SLQB. Sachin for example says that there was a stall issue
>>> with memoryless nodes that could be triggered without SLQB. Sachin, is
>>> that still accurate?
>>>   
>>>       
>> I think there are two different problems that we are dealing with.
>>
>> First one is the SLQB not working on a ppc64 box which seems to be specific
>> to only one machine and i haven't seen that on other power boxes.The patches
>> that you have posted seems to allow the box to boot, but eventually it hits
>> the stall issue(related to percpu dynamic allocator not working on ppc64),
>> which is the second problem we are dealing with.
>>
>>     
>
> Ok, I've sent out V3 of this. It's only a partial fix but it's about as
> far as it can be brought until the other difficulties are resolved.
>   
Thanks Mel.

>   
>> The stall issue seems to be much more critical as it is affecting almost
>> all of the power boxes that i have tested with (4 in all).
>> This issue is seen with Linus tree as well and was first seen with
>> 2.6.31-git5 (0cb583fd..) 
>>
>> The stall issue was reported here:
>> http://lists.ozlabs.org/pipermail/linuxppc-dev/2009-September/075791.html
>>
>>     
>
> Can you bisect this please?
>   
The problem seems to have been introduced with
commit ada3fa15057205b7d3f727bba5cd26b5912e350f.

Specifically this patch : 
powerpc64: convert to dynamic percpu allocator

If i revert this patch i am able to boot latest git
on a powerpc box.

Thanks
-Sachin

-- 

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------

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