Subject: Re: [PATCH] mmu notifiers #v8
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Jack Steiner <steiner@sgi.com>
Cc: Nick Piggin <npiggin@suse.de>, Andrea Arcangeli <andrea@qumranet.com>,
       akpm@linux-foundation.org, Robin Holt <holt@sgi.com>,
       Avi Kivity <avi@qumranet.com>, Izik Eidus <izike@qumranet.com>,
       kvm-devel@lists.sourceforge.net, general@lists.openfabrics.org,
       Steve Wise <swise@opengridcomputing.com>,
       Roland Dreier <rdreier@cisco.com>, Kanoj Sarcar <kanojsarcar@yahoo.com>,
       linux-kernel@vger.kernel.org, linux-mm@kvack.org,
       daniel.blueman@quadrics.com, Christoph Lameter <clameter@sgi.com>
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Date: Tue, 04 Mar 2008 11:35:32 +0100
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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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