linux-kernel - Re: [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges

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Message-ID: <20080228005249.GF8091@v2.random>
Date:	Thu, 28 Feb 2008 01:52:50 +0100
From:	Andrea Arcangeli <andrea@...ranet.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>, akpm@...ux-foundation.org,
	Robin Holt <holt@....com>, Avi Kivity <avi@...ranet.com>,
	Izik Eidus <izike@...ranet.com>,
	kvm-devel@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	general@...ts.openfabrics.org,
	Steve Wise <swise@...ngridcomputing.com>,
	Roland Dreier <rdreier@...co.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>, steiner@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [patch 2/6] mmu_notifier: Callbacks to invalidate address
	ranges

On Wed, Feb 27, 2008 at 04:14:08PM -0800, Christoph Lameter wrote:
> Erm. This would also be needed by RDMA etc.

The only RDMA I know is Quadrics, and Quadrics apparently doesn't need
to schedule inside the invalidate methods AFIK, so I doubt the above
is true. It'd be interesting to know if IB is like Quadrics and it
also doesn't require blocking to invalidate certain remote mappings.
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