From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755252AbZEQTej (ORCPT ); Sun, 17 May 2009 15:34:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753041AbZEQTeZ (ORCPT ); Sun, 17 May 2009 15:34:25 -0400 Received: from casper.infradead.org ([85.118.1.10]:42536 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755088AbZEQTeX (ORCPT ); Sun, 17 May 2009 15:34:23 -0400 Date: Sun, 17 May 2009 12:33:24 -0700 From: Arjan van de Ven To: david@lang.hm Cc: devzero@web.de, Jeremy Fitzhardinge , Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: Where do we stand with the Xen patches? Message-ID: <20090517123324.2e57bc55@infradead.org> In-Reply-To: References: <720338507@web.de> Organization: Intel X-Mailer: Claws Mail 3.7.0 (GTK+ 2.14.7; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 17 May 2009 12:25:38 -0700 (PDT) david@lang.hm wrote: > On Sun, 17 May 2009, devzero@web.de wrote: > > maybe this is iust a stupid comment (please forgive, i?m no > > advanced kernel hacker), but can?t the code inserted by the patches > > and which changes the fastpath just #IFDEF`ed at the critical > > offsets ? (as building a dom0 kernel is just another build target, > > isn`t it ?) > > no, if dom0 is going to be widely deployed, it will be because the > distros turn on dom0 support by default. as a result any penalties > due to xen support will be felt by all users of those distros (even > if they don't use xen) > at minimum we need to split CONFIG_PARAVIRT up into "want to be nice to hypervisors" and "I want to be Xen Dom0"; they look to largely not overlap.... so lets not make the costs overlap either. -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org