linux-kernel - Re: 2.6.32.5 regression: page allocation failure. order:1,

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Message-ID: <alpine.DEB.2.00.1001271701170.17513@chino.kir.corp.google.com>
Date:	Wed, 27 Jan 2010 17:04:08 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Mark Lord <kernel@...savvy.com>
cc:	Mel Gorman <mel@....ul.ie>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>
Subject: Re: 2.6.32.5 regression: page allocation failure. order:1, 

On Wed, 27 Jan 2010, Mark Lord wrote:

> > There was one bug related to MIGRATE_RESERVE that might be affecting
> > you. It reported as impacting swap-orientated workloads but it could
> > easily affect drivers that depend on high-order atomic allocations.
> > Unfortunately, the fix is not signed-off yet but I expect it to make its
> > way towards mainline when it is.
> > 
> > Here is the patch with a slightly-altered changelog. Can you test if it
> > makes a difference please?
> ..
> 
> We don't like to reboot our 24/7 server very often,
> and certainly not for debugging buggy kernels.
> 
> It's rock solid again with 2.6.31.12 on it now.
> 

Is there something specific about the workload that makes it easily 
reproducible?  Are you saying that 2.6.31.12 is "rock solid" because it 
has survived a certain workload that caused these page allocation failures 
with 2.6.32.5, or simply because it has a longer uptime and hasn't shown 
a problem?  It would be very helpful to describe the load so that we can 
attempt to reproduce it locally without a sacrifice to your server.
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