From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423195AbXBUWVC (ORCPT ); Wed, 21 Feb 2007 17:21:02 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1423200AbXBUWVB (ORCPT ); Wed, 21 Feb 2007 17:21:01 -0500 Received: from gw.goop.org ([64.81.55.164]:55446 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423195AbXBUWVA (ORCPT ); Wed, 21 Feb 2007 17:21:00 -0500 Message-ID: <45DCC5C8.4090905@goop.org> Date: Wed, 21 Feb 2007 14:20:56 -0800 From: Jeremy Fitzhardinge User-Agent: Thunderbird 1.5.0.9 (X11/20070212) MIME-Version: 1.0 To: Andi Kleen CC: virtualization@lists.osdl.org, Chris Wright , xen-devel@lists.xensource.com, Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries References: <20070221205254.169835700@goop.org> <20070221205322.869165491@goop.org> <200702212315.12883.ak@suse.de> In-Reply-To: <200702212315.12883.ak@suse.de> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andi Kleen wrote: > Do you have some lmbench numbers before/after this change? > iirc at least fork and exit do a lot of pte accesses in various forms. > If it's measurable it might be needed to patch those for the native case. > I don't. I think Rusty ran some numbers and found the pte accessors became the most commonly used paravirt ops. I'm working on revamping the pv_ops patching infrastructure at the moment, so we should be able to deal with these fairly efficiently. J