From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrea Arcangeli <andrea@qumranet.com>
Subject: Re: [patch 2/6] mmu_notifier: Callbacks to invalidate
	address	ranges
Date: Thu, 28 Feb 2008 02:10:20 +0100
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Cc: Nick Piggin <nickpiggin@yahoo.com.au>, steiner@sgi.com,
	Peter Zijlstra <a.p.zijlstra@chello.nl>, linux-mm@kvack.org,
	Kanoj Sarcar <kanojsarcar@yahoo.com>,
	Roland Dreier <rdreier@cisco.com>,
	Steve Wise <swise@opengridcomputing.com>,
	linux-kernel@vger.kernel.org, Avi Kivity <avi@qumranet.com>,
	kvm-devel@lists.sourceforge.net, daniel.blueman@quadrics.com,
	Robin Holt <holt@sgi.com>, general@lists.openfabrics.org,
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To: Christoph Lameter <clameter@sgi.com>
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On Wed, Feb 27, 2008 at 05:03:21PM -0800, Christoph Lameter wrote:
> RDMA works across a network and I would assume that it needs confirmation 
> that a connection has been torn down before pages can be unmapped.

Depends on the latency of the network, for example with page pinning
it can even try to reduce the wait time, by tearing down the mapping
in range_begin and spin waiting the ack only later in range_end.

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