linux-kernel - Re: mke2fs: page allocation failure w/ kernel 2.6.37

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Message-ID: <20110107232339.GS21922@thunk.org>
Date:	Fri, 7 Jan 2011 18:23:39 -0500
From:	Ted Ts'o <tytso@....edu>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Toralf Förster <toralf.foerster@....de>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: mke2fs: page allocation failure w/ kernel 2.6.37

On Fri, Jan 07, 2011 at 02:45:30PM -0800, David Rientjes wrote:
> On Wed, 5 Jan 2011, Toralf Förster wrote:
> 
> > Hello,
> > 
> > I got this in /var/log/messages today (created a ext2 partition at an external USB drive, worked fine) :
> > 
> 
> Yeah, this failure is from the kmemleak stack which simply means that 
> debugging tool will be disabled rather than any disruption to the 
> workflow.
> 
> I'm curious why kmemleak is masking with GFP_KERNEL and GFP_ATOMIC and not 
> allowing users to pass __GFP_NOWARN to suppress this type of failure, 
> especially since the stack trace is already emitted by kmemleak when it is 
> stopped.  Catalin?

Indeed, is there a reason why the kmemleak code is so noisy?  And can
it display a more obvious message about what is going on?  It took me
a while to figure out why it was unhappy, and whether there it was a
fault of the code it was testing, or just that it could get the memory
it needed....

						- Ted
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