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Date: Thu, 12 May 2011 14:13:44 +0300
From: Pekka Enberg <penberg@cs.helsinki.fi>
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Subject: Re: [PATCH 0/3] Reduce impact to overall system of SLUB using high-order
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To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: David Rientjes <rientjes@google.com>, Mel Gorman <mgorman@suse.de>, Andrew Morton <akpm@linux-foundation.org>, Colin King <colin.king@canonical.com>, Raghavendra D Prabhu <raghu.prabhu13@gmail.com>, Jan Kara <jack@suse.cz>, Chris Mason <chris.mason@oracle.com>, Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, linux-fsdevel <linux-fsdevel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, linux-kernel <linux-kernel@vger.kernel.org>, linux-ext4 <linux-ext4@vger.kernel.org>

On 5/12/11 1:34 AM, James Bottomley wrote:
> On Wed, 2011-05-11 at 15:28 -0700, David Rientjes wrote:
>> On Wed, 11 May 2011, James Bottomley wrote:
>>
>>> OK, I confirm that I can't seem to break this one.  No hangs visible,
>>> even when loading up the system with firefox, evolution, the usual
>>> massive untar, X and even a distribution upgrade.
>>>
>>> You can add my tested-by
>>>
>> Your system still hangs with patches 1 and 2 only?
> Yes, but only once in all the testing.  With patches 1 and 2 the hang is
> much harder to reproduce, but it still seems to be present if I hit it
> hard enough.

Patches 1-2 look reasonable to me. I'm not completely convinced of patch 
3, though. Why are we seeing these problems now? This has been in 
mainline for a long time already. Shouldn't we fix kswapd?

                         Pekka

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