From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ingo Molnar Subject: Re: RCU red-black tree (was: Re: [PATCH 4/6] kvm tools: Add rwlock wrapper) Date: Tue, 31 May 2011 15:09:23 +0200 Message-ID: <20110531130923.GA13888@elte.hu> References: <1306491547.3217.9.camel@lappy> <20110527131400.GC29744@Krystal> <20110529170104.GA17189@Krystal> <1306691292.14564.12.camel@lappy> <20110530025414.GA25865@Krystal> <1306735631.14564.34.camel@lappy> <20110530173844.GA13361@Krystal> <1306777969.15912.3.camel@lappy> <20110530185757.GA13903@Krystal> <1306847114.25406.9.camel@lappy> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Mathieu Desnoyers , Pekka Enberg , Avi Kivity , john@jfloren.net, kvm@vger.kernel.org, asias.hejun@gmail.com, gorcunov@gmail.com, prasadjoshi124@gmail.com, "Paul E. McKenney" , Phil Howard , rp@svcs.cs.pdx.edu To: Sasha Levin Return-path: Received: from mx3.mail.elte.hu ([157.181.1.138]:46565 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753098Ab1EaNJv (ORCPT ); Tue, 31 May 2011 09:09:51 -0400 Content-Disposition: inline In-Reply-To: <1306847114.25406.9.camel@lappy> Sender: kvm-owner@vger.kernel.org List-ID: * Sasha Levin wrote: > I've started working on converting our MMIO code to use RCU rbtree. Well, why would we want to switch the MMIO code away from the brlock right now? mmio tree reconfigurations are very, very rare. Won't something like the qcow cache be more suitable for that? That has both frequent read and write activities. Thanks, Ingo