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

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Message-ID: <20081029220737.GF11532@poweredge.glommer>
Date:	Wed, 29 Oct 2008 20:07:37 -0200
From:	Glauber Costa <glommer@...hat.com>
To:	Nick Piggin <npiggin@...e.de>
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 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.

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