linux-kernel - Re: [patch 0/6] Guest page hinting version 6.

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Date:	Thu, 13 Mar 2008 18:55:38 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	virtualization@...ts.osdl.org, akpm@...ux-foundation.org,
	nickpiggin@...oo.com.au, zach@...are.com, frankeh@...son.ibm.com,
	rusty@...tcorp.com.au, andrea@...ranet.com, clameter@....com,
	a.p.zijlstra@...llo.nl, Keir Fraser <keir@...source.com>,
	Ian Pratt <ian.pratt@...source.com>
Subject: Re: [patch 0/6] Guest page hinting version 6.

On Thu, 13 Mar 2008, Jeremy Fitzhardinge wrote:
> 
> My other concern is just correctness over time on the Linux side.  We already
> have enough trouble keeping things like the pte and page structure state in
> sync, with resulting rare data-loss bugs.  Adding another layer which only
> applies in specific environments raises the possibility for new bugs to be
> un-noticed for a long time.  How can we structure the VM changes to make sure
> that its robust in the face of maintenance?

Yes, that's the main concern, as whenever lots of subtlety is added.
I wonder if there's any chance of a CONFIG_DEBUG mode, which could be
run on anybody's x86 machine, without involving any virtualization, but
in which the PAGE_STATEs become essential to the correct working of the mm.

Hugh
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