linux-kernel - Re: EMM: Require single threadedness for registration.

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Message-ID: <Pine.LNX.4.64.0804021536020.32132@schroedinger.engr.sgi.com>
Date:	Wed, 2 Apr 2008 15:41:34 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Hugh Dickins <hugh@...itas.com>, 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, Nick Piggin <npiggin@...e.de>
Subject: Re: EMM: Require single threadedness for registration.

On Thu, 3 Apr 2008, Andrea Arcangeli wrote:

> Why can't it fire on the mm_struct where GRU just registered? That
> mm_struct existed way before GRU registered, and VM is free to unmap
> it w/o mmap_sem if there was any memory pressure.

Right. Hmmm... Bad situation. We would have invalidate_start take
a lock to prevent registration until _end has run.

We could use stop_machine_run to register the notifier.... ;-).

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