linux-kernel - Re: [PATCH 1/3] slqb: Do not use DEFINE_PER

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Date:	Mon, 21 Sep 2009 10:09:23 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Sachin Sant <sachinp@...ibm.com>
Cc:	Tejun Heo <tj@...nel.org>, Pekka Enberg <penberg@...helsinki.fi>,
	Nick Piggin <npiggin@...e.de>,
	Christoph Lameter <cl@...ux-foundation.org>,
	heiko.carstens@...ibm.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 1/3] slqb: Do not use DEFINE_PER_CPU for per-node data

On Mon, Sep 21, 2009 at 02:32:33PM +0530, Sachin Sant wrote:
> Mel Gorman wrote:
>>> I applied the three patches from Mel and one from Tejun.
>>>     
>>
>> Thanks Sachin
>>
>> Was there any useful result from Tejun's patch applied on its own?
>>   
> Haven't tried with just the patch from Tejun. I will give this a try.
> I might not get a chance to test this until late in the evening my time.
> (Today being a holiday for me )
>

Ok, I've blatently nabbed your machine again then (yoink haha) and
a relevant kernel is building at the moment. I'll put the dmesg when it
becomes available. Go enjoy your holiday

>>> Tejun, the above hang looks exactly the same as the one
>>> i have reported here :
>>>
>>> http://lists.ozlabs.org/pipermail/linuxppc-dev/2009-September/075791.html
>>>
>>> This particular hang was bisected to the following patch
>>>
>>> powerpc64: convert to dynamic percpu allocator
>>>
>>> This hang can be recreated without SLQB. So i think this is a different
>>> problem. 
>>>
>>>     
>>
>> Was that bug ever resolved?
>>   
> The bug was still present with git9(78f28b..). With latest git
> git10(ebc79c4 ..)i haven't tested it yet because of perf counter
> build errors.
>

Ok, so right now there are three separate bugs with this machine

1. SLQB + Memoryless shots itself in the face due to suspected
	per-cpu area corruption
2. SLQB with memoryless nodes frees pages remotely and allocates
	locally with a similar effect as if it was a memory leak.
3. pcpu_alloc can hang but is not related to SLQB

Thanks

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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