From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Andrea Arcangeli <andrea@qumranet.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
kvm-devel@lists.sourceforge.net, Avi Kivity <avi@qumranet.com>,
Izik Eidus <izike@qumranet.com>,
clameter@sgi.com, daniel.blueman@quadrics.com, holt@sgi.com,
steiner@sgi.com, Andrew Morton <akpm@osdl.org>,
Hugh Dickins <hugh@veritas.com>, Nick Piggin <npiggin@suse.de>,
Dave Airlie <airlied@gmail.com>
Subject: Re: [PATCH] mmu notifiers #v2
Date: Mon, 14 Jan 2008 08:11:44 +1100 [thread overview]
Message-ID: <1200258704.6896.146.camel@pasglop> (raw)
In-Reply-To: <20080113162418.GE8736@v2.random>
On Sun, 2008-01-13 at 17:24 +0100, Andrea Arcangeli wrote:
> Hello,
>
> This patch is last version of a basic implementation of the mmu
> notifiers.
>
> In short when the linux VM decides to free a page, it will unmap it
> from the linux pagetables. However when a page is mapped not just by
> the regular linux ptes, but also from the shadow pagetables, it's
> currently unfreeable by the linux VM.
>
> This patch allows the shadow pagetables to be dropped and the page to
> be freed after that, if the linux VM decides to unmap the page from
> the main ptes because it wants to swap out the page.
Another potential user of that I can see is the DRM. Nowadays, graphic
cards essentially have an MMU on chip, and can do paging. It would be
nice to be able to map user objects in them without having to lock them
down using your callback to properly mark them cast out on the card.
Ben.
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next prev parent reply other threads:[~2008-01-13 21:11 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 [this message]
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
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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