linux-kernel - Re: [RFC] Notifier for Externally Mapped Memory (EMM)

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Message-Id: <1204670529.6241.52.camel@lappy>
Date:	Tue, 04 Mar 2008 23:42:09 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Lameter <clameter@....com>
Cc:	Andrea Arcangeli <andrea@...ranet.com>,
	Jack Steiner <steiner@....com>, Nick Piggin <npiggin@...e.de>,
	akpm@...ux-foundation.org, Robin Holt <holt@....com>,
	Avi Kivity <avi@...ranet.com>, kvm-devel@...ts.sourceforge.net,
	general@...ts.openfabrics.org,
	Steve Wise <swise@...ngridcomputing.com>,
	Roland Dreier <rdreier@...co.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [RFC] Notifier for Externally Mapped Memory (EMM)


On Tue, 2008-03-04 at 14:35 -0800, Christoph Lameter wrote:

> RCU means that the callbacks occur in an atomic context.

Not really, if it requires moving the VM locks to sleepable locks under
a .config option, I think its also fair to require PREEMPT_RCU.

OTOH, if you want to unconditionally move the VM locks to sleepable
locks you have a point.

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