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Date: Wed, 7 May 2008 17:00:15 +0200
From: Andrea Arcangeli <andrea@qumranet.com>
To: Robin Holt <holt@sgi.com>
Cc: Christoph Lameter <clameter@sgi.com>, Jack Steiner <steiner@sgi.com>,
       Nick Piggin <npiggin@suse.de>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
       kvm-devel@lists.sourceforge.net, 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>, linux-mm@kvack.org,
       general@lists.openfabrics.org, Hugh Dickins <hugh@veritas.com>,
       akpm@linux-foundation.org, Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: [PATCH 01 of 12] Core of mmu notifiers
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On Tue, Apr 29, 2008 at 06:03:40PM +0200, Andrea Arcangeli wrote:
> Christoph if you've interest in evolving anon-vma-sem and i_mmap_sem
> yourself in this direction, you're very welcome to go ahead while I

In case you didn't notice this already, for a further explanation of
why semaphores runs slower for small critical sections and why the
conversion from spinlock to rwsem should happen under a config option,
see the "AIM7 40% regression with 2.6.26-rc1" thread.