Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758650AbXHVMJI (ORCPT ); Wed, 22 Aug 2007 08:09:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757662AbXHVMI5 (ORCPT ); Wed, 22 Aug 2007 08:08:57 -0400 Received: from il.qumranet.com ([82.166.9.18]:60015 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756434AbXHVMI5 (ORCPT ); Wed, 22 Aug 2007 08:08:57 -0400 Message-ID: <46CC2766.7020602@qumranet.com> Date: Wed, 22 Aug 2007 15:09:10 +0300 From: Avi Kivity User-Agent: Thunderbird 2.0.0.0 (X11/20070419) MIME-Version: 1.0 To: Andi Kleen CC: Rusty Russell , Andrew Morton , Linux Kernel Mailing List , Chris Wright , Virtualization Mailing List Subject: Re: [PATCH] Add I/O hypercalls for i386 paravirt References: <46CBC842.4070100@vmware.com> <46CBCADF.2070400@qumranet.com> <1187763956.6174.48.camel@localhost.localdomain> <20070822103545.GG2642@bingen.suse.de> <46CC0719.2080103@qumranet.com> <20070822110810.GO32640@bingen.suse.de> <46CC0EAF.3000805@qumranet.com> <20070822112352.GQ32640@bingen.suse.de> In-Reply-To: <20070822112352.GQ32640@bingen.suse.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1097 Lines: 38 Andi Kleen wrote: > On Wed, Aug 22, 2007 at 01:23:43PM +0300, Avi Kivity wrote: > >> Andi Kleen wrote: >> >>>> I don't see why it's intrusive -- they all use the APIs, right? >>>> >>>> >>> Yes, but it still changes them. It might have a larger impact >>> on code size for example. >>> >>> >> Only if CONFIG_PARAVIRT is defined. >> > > Which eventually distribution kernels will do. > > >> And even then, all the performance >> sensitive stuff uses mmio, no? >> > > Not worried about performance, but just impact on code size etc. > Ah. But that's mostly modules, so real in-core changes should be very small (say 10 bytes per call site X 10 callsites per driver X 10 drivers... even if off by an order of magnitude it's still tiny) -- error compiling committee.c: too many arguments to function - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/