linux-kernel - Re: [PATCH 01 of 12] Core of mmu notifiers

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Message-ID: <20080423133619.GV24536@duo.random>
Date:	Wed, 23 Apr 2008 15:36:19 +0200
From:	Andrea Arcangeli <andrea@...ranet.com>
To:	Robin Holt <holt@....com>
Cc:	Christoph Lameter <clameter@....com>,
	Nick Piggin <npiggin@...e.de>, Jack Steiner <steiner@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel@...ts.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	linux-kernel@...r.kernel.org, Avi Kivity <avi@...ranet.com>,
	linux-mm@...ck.org, general@...ts.openfabrics.org,
	Hugh Dickins <hugh@...itas.com>, akpm@...ux-foundation.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 01 of 12] Core of mmu notifiers

On Tue, Apr 22, 2008 at 06:07:27PM -0500, Robin Holt wrote:
> > The only other change I did has been to move mmu_notifier_unregister
> > at the end of the patchset after getting more questions about its
> > reliability and I documented a bit the rmmod requirements for
> > ->release. we'll think later if it makes sense to add it, nobody's
> > using it anyway.
> 
> XPMEM is using it.  GRU will be as well (probably already does).

XPMEM requires more patches anyway. Note that in previous email you
told me you weren't using it. I think GRU can work fine on 2.6.26
without mmu_notifier_unregister, like KVM too. You've simply to unpin
the module count in ->release. The most important bit is that you've
to do that anyway in case mmu_notifier_unregister fails (and it can
fail because of vmalloc space shortage because somebody loaded some
framebuffer driver or whatever).
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