linux-kernel - Re: [PATCH] regression: vmalloc easily fail.

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Date:	Thu, 30 Oct 2008 02:53:35 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Glauber Costa <glommer@...hat.com>
Cc:	Avi Kivity <avi@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, aliguori@...emonkey.ws,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Krzysztof Helt <krzysztof.h1@...zta.fm>
Subject: Re: [PATCH] regression: vmalloc easily fail.

On Wed, Oct 29, 2008 at 08:07:37PM -0200, Glauber Costa wrote:
> On Wed, Oct 29, 2008 at 11:43:33AM +0100, Nick Piggin wrote:
> > On Wed, Oct 29, 2008 at 12:29:40PM +0200, Avi Kivity wrote:
> > > Nick Piggin wrote:
> > > >Hmm, spanning <30MB of memory... how much vmalloc space do you have?
> > > >
> > > >  
> > > 
> > > From the original report:
> > > 
> > > >VmallocTotal:     122880 kB
> > > >VmallocUsed:       15184 kB
> > > >VmallocChunk:      83764 kB
> > > 
> > > So it seems there's quite a bit of free space.
> > > 
> > > Chunk is the largest free contiguous region, right?  If so, it seems the 
> > 
> > Yes.
> > 
> > 
> > > problem is unrelated to guard pages, instead the search isn't finding a 
> > > 1-page area (with two guard pages) for some reason, even though lots of 
> > > free space is available.
> > 
> > Hmm. The free area search could be buggy...
> Do you want me to grab any specific info of it? Or should I just hack myself
> randomly into it? I'll probably have some time for that tomorrow.

I can take a look at it, in the next day or two. If you hack at it, and
find the problem I wouldn't be upset ;)
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