linux-kernel - Re: [PATCH 01 of 12] Core of mmu notifiers

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Message-ID: <Pine.LNX.4.64.0804281332030.31163@schroedinger.engr.sgi.com>
Date:	Mon, 28 Apr 2008 13:34:11 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Robin Holt <holt@....com>, Jack Steiner <steiner@....com>,
	Nick Piggin <npiggin@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel@...ts.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	linux-kernel@...r.kernel.org, Avi Kivity <avi@...ranet.com>,
	linux-mm@...ck.org, general@...ts.openfabrics.org,
	Hugh Dickins <hugh@...itas.com>, akpm@...ux-foundation.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 01 of 12] Core of mmu notifiers

On Sun, 27 Apr 2008, Andrea Arcangeli wrote:

> Talking about post 2.6.26: the refcount with rcu in the anon-vma
> conversion seems unnecessary and may explain part of the AIM slowdown
> too. The rest looks ok and probably we should switch the code to a
> compile-time decision between rwlock and rwsem (so obsoleting the
> current spinlock).

You are going to take a semphore in an rcu section? Guess you did not 
activate all debugging options while testing? I was not aware that you can 
take a sleeping lock from a non preemptible context.


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