From: Christoph Lameter <clameter@sgi.com>
To: Andrea Arcangeli <andrea@qumranet.com>
Cc: Robin Holt <holt@sgi.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,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
steiner@sgi.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, daniel.blueman@quadrics.com,
Hugh Dickins <hugh@veritas.com>
Subject: Re: [kvm-devel] [PATCH] export notifier #1
Date: Wed, 23 Jan 2008 11:47:27 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0801231145210.13547@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20080123105246.GG26420@sgi.com>
On Wed, 23 Jan 2008, Robin Holt wrote:
> > That won't work for kvm. If we have a hundred virtual machines, that means
> > 99 no-op notifications.
>
> But 100 callouts holding spinlocks will not work for our implementation
> and even if the callouts are made with spinlocks released, we would very
> strongly prefer a single callout which messages the range to the other
> side.
Andrea wont have 99 no op notifications. You will have one notification to
the kvm subsystem (since there needs to be only one register operation
for a subsystem that wants to get notifications). What do you do there is
up to kvm. If you want to call some function 99 times then you are free to
do that.
next prev parent reply other threads:[~2008-01-23 19:47 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 [this message]
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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