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

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Message-ID: <Pine.LNX.4.64.0804231118190.12373@schroedinger.engr.sgi.com>
Date:	Wed, 23 Apr 2008 11:19:26 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Jack Steiner <steiner@....com>, Robin Holt <holt@....com>,
	Nick Piggin <npiggin@...e.de>,
	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 Wed, 23 Apr 2008, Andrea Arcangeli wrote:

> The only way to avoid failing because of vmalloc space shortage or
> oom, would be to provide a O(N*N) fallback. But one that can't be
> interrupted by sigkill! sigkill interruption was ok in #v12 because we
> didn't rely on mmu_notifier_unregister to succeed. So it avoided any
> DoS but it still can't provide any reliable unregister.

If unregister fails then the driver should not detach from the address
space immediately but wait until -->release is called. That may be
a possible solution. It will be rare that the unregister fails.


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