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

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Message-ID: <20081031025958.GB19268@wotan.suse.de>
Date:	Fri, 31 Oct 2008 03:59:58 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Glauber Costa <glommer@...hat.com>
Cc:	Matt Mackall <mpm@...enic.com>, 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 Thu, Oct 30, 2008 at 04:04:43PM -0200, Glauber Costa wrote:
> On Thu, Oct 30, 2008 at 11:46:02AM -0500, Matt Mackall wrote:
> > On Thu, 2008-10-30 at 05:49 +0100, Nick Piggin wrote:
> > > I still think we should get rid of the guard pages in non-debug kernels
> > > completely,
> > 
> > For what it's worth, I agree.
> Do we want any specific option, or is DEBUG_VM enough ?

I'd almost say DEBUG_PAGEALLOC; which could also disable lazy unmapping
in order to catch use-after free better. Or just a different option
entirely.

DEBUG_VM has, so far, been kept to relatively cheap tests that are not
much pain to turn on, and shouldn't result in much behavioural change
of algorithms/data structures AFAIKS. Which can be a good thing.
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