linux-kernel - Re: [PATCH] mmu notifiers #v8

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Message-ID: <20080304144406.GA25467@sgi.com>
Date:	Tue, 4 Mar 2008 08:44:06 -0600
From:	Jack Steiner <steiner@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <andrea@...ranet.com>,
	akpm@...ux-foundation.org, Robin Holt <holt@....com>,
	Avi Kivity <avi@...ranet.com>, Izik Eidus <izike@...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, Christoph Lameter <clameter@....com>
Subject: Re: [PATCH] mmu notifiers #v8

On Tue, Mar 04, 2008 at 11:35:32AM +0100, Peter Zijlstra wrote:
> 
> On Mon, 2008-03-03 at 13:15 -0600, Jack Steiner wrote:
> 
> > I haven't thought about locking requirements for the radix tree. Most accesses
> > would be read-only & updates infrequent. Any chance of an RCU-based radix
> > implementation?  Otherwise, don't we add the potential for hot locks/cachelines
> > for threaded applications ???
> 
> The current radix tree implementation in the kernel is RCU capable. We
> just don't have many RCU users yet.

Ahhh. You are right. I thought I looked but obviously missed it.
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