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

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Message-Id: <1204626932.6241.41.camel@lappy>
Date:	Tue, 04 Mar 2008 11:35:32 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jack Steiner <steiner@....com>
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 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.

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