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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andrea Arcangeli <andrea@qumranet.com>,
Avi Kivity <avi@qumranet.com>, Izik Eidus <izike@qumranet.com>,
Andrew Morton <akpm@osdl.org>, Nick Piggin <npiggin@suse.de>,
kvm-devel@lists.sourceforge.net, steiner@sgi.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
daniel.blueman@quadrics.com, holt@sgi.com,
Hugh Dickins <hugh@veritas.com>
Subject: Re: [kvm-devel] [PATCH] export notifier #1
Date: Wed, 23 Jan 2008 10:36:29 +1100 [thread overview]
Message-ID: <1201044989.6807.46.camel@pasglop> (raw)
In-Reply-To: <Pine.LNX.4.64.0801221232040.28197@schroedinger.engr.sgi.com>
On Tue, 2008-01-22 at 12:34 -0800, Christoph Lameter wrote:
>
> - Notifiers are called *after* we tore down ptes. At that point pages
> may already have been freed and reused. This means that there can
> still be uses of the page by the user of mmu_ops after the OS has
> dropped its mapping. IMHO the foreign entity needs to drop its
> mappings first. That also ensures that the entities operated
> upon continue to exist.
That's definitely an issue. Maybe having the foreign entity get a
reference to the page and drop it when it unmaps would help ?
> - anon_vma/inode and pte locks are held during callbacks.
So how does that fix the problem of sleeping then ?
Ben.
next prev parent reply other threads:[~2008-01-22 23:38 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-13 16:24 [PATCH] mmu notifiers #v2 Andrea Arcangeli
2008-01-13 21:11 ` Benjamin Herrenschmidt
2008-01-14 20:02 ` Christoph Lameter
2008-01-15 4:28 ` Benjamin Herrenschmidt
2008-01-15 12:44 ` Andrea Arcangeli
2008-01-15 20:18 ` Benjamin Herrenschmidt
2008-01-16 1:06 ` Andrea Arcangeli
2008-01-16 9:01 ` Brice Goglin
2008-01-16 10:19 ` Andrea Arcangeli
2008-01-16 17:42 ` Rik van Riel
2008-01-16 17:48 ` Izik Eidus
2008-01-17 16:23 ` Andrea Arcangeli
2008-01-17 18:21 ` Izik Eidus
2008-01-17 19:32 ` Andrea Arcangeli
2008-01-21 12:52 ` [PATCH] mmu notifiers #v3 Andrea Arcangeli
2008-01-22 2:21 ` Rik van Riel
2008-01-22 14:12 ` [kvm-devel] " Avi Kivity
2008-01-22 14:43 ` Andrea Arcangeli
2008-01-22 20:08 ` [kvm-devel] [PATCH] mmu notifiers #v4 Andrea Arcangeli
2008-01-22 20:34 ` [kvm-devel] [PATCH] export notifier #1 Christoph Lameter
2008-01-22 22:31 ` Andrea Arcangeli
2008-01-22 22:53 ` Christoph Lameter
2008-01-23 10:27 ` Avi Kivity
2008-01-23 10:52 ` Robin Holt
2008-01-23 12:04 ` Andrea Arcangeli
2008-01-23 12:34 ` Robin Holt
2008-01-23 19:48 ` Christoph Lameter
2008-01-23 19:58 ` Robin Holt
2008-01-23 19:47 ` Christoph Lameter
2008-01-24 5:56 ` Avi Kivity
2008-01-24 12:26 ` Andrea Arcangeli
2008-01-24 12:34 ` Avi Kivity
2008-01-23 11:41 ` Andrea Arcangeli
2008-01-23 12:32 ` Robin Holt
2008-01-23 17:33 ` Andrea Arcangeli
2008-01-23 20:27 ` Christoph Lameter
2008-01-24 15:42 ` Andrea Arcangeli
2008-01-24 20:07 ` Christoph Lameter
2008-01-25 6:35 ` Avi Kivity
2008-01-23 20:18 ` Christoph Lameter
2008-01-24 14:34 ` Andrea Arcangeli
2008-01-24 14:41 ` Andrea Arcangeli
2008-01-24 15:15 ` Avi Kivity
2008-01-24 15:18 ` Avi Kivity
2008-01-24 20:01 ` Christoph Lameter
2008-01-22 23:36 ` Benjamin Herrenschmidt [this message]
2008-01-23 0:40 ` Christoph Lameter
2008-01-23 1:21 ` Robin Holt
2008-01-23 12:51 ` Gerd Hoffmann
2008-01-23 13:19 ` Robin Holt
2008-01-23 14:12 ` Gerd Hoffmann
2008-01-23 14:18 ` Robin Holt
2008-01-23 14:35 ` Gerd Hoffmann
2008-01-23 15:48 ` Robin Holt
2008-01-23 14:17 ` Avi Kivity
2008-01-24 4:03 ` Benjamin Herrenschmidt
2008-01-23 15:41 ` Andrea Arcangeli
2008-01-23 17:47 ` Gerd Hoffmann
2008-01-24 6:01 ` Avi Kivity
2008-01-24 6:45 ` Jeremy Fitzhardinge
2008-01-23 20:40 ` Christoph Lameter
2008-01-24 2:00 ` Enhance mmu notifiers to accomplish a lockless implementation (incomplete) Robin Holt
2008-01-24 4:05 ` Robin Holt
2008-01-22 19:28 ` [PATCH] mmu notifiers #v3 Peter Zijlstra
2008-01-22 20:31 ` Christoph Lameter
2008-01-22 20:31 ` Andrea Arcangeli
2008-01-22 22:10 ` Hugh Dickins
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