From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753539Ab0CUVAY (ORCPT ); Sun, 21 Mar 2010 17:00:24 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:37316 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753443Ab0CUVAX (ORCPT ); Sun, 21 Mar 2010 17:00:23 -0400 Date: Sun, 21 Mar 2010 22:00:11 +0100 From: Ingo Molnar To: Avi Kivity Cc: Antoine Martin , Anthony Liguori , Pekka Enberg , "Zhang, Yanmin" , Peter Zijlstra , Sheng Yang , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Marcelo Tosatti , oerg Roedel , Jes Sorensen , Gleb Natapov , Zachary Amsden , ziteng.huang@intel.com, Arnaldo Carvalho de Melo , Fr?d?ric Weisbecker Subject: Re: [RFC] Unify KVM kernel-space and user-space code into a single project Message-ID: <20100321210011.GD30194@elte.hu> References: <20100318170223.GB9756@elte.hu> <4BA25E66.2050800@redhat.com> <20100318172805.GB26067@elte.hu> <4BA32E1A.2060703@redhat.com> <20100319085346.GG12576@elte.hu> <4BA3747F.60401@codemonkey.ws> <20100321191742.GD25922@elte.hu> <4BA674F1.6070603@nagafix.co.uk> <20100321195903.GA29490@elte.hu> <4BA67D0B.9030705@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4BA67D0B.9030705@redhat.com> User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.5 -2.0 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Avi Kivity wrote: > On 03/21/2010 09:59 PM, Ingo Molnar wrote: > > > >Frankly, i was surprised (and taken slightly off base) by both Avi and Anthony > >suggesting such a clearly inferior "add a demon to the guest space" solution. > >It's a usability and deployment non-starter. > > It's only clearly inferior if you ignore every consideration against it. > It's definitely not a deployment non-starter, see the tons of daemons that > come with any Linux system. [...] Avi, please dont put arguments into my mouth that i never made. My (clearly expressed) argument was that: _a new guest-side demon is a transparent instrumentation non-starter_ What is so hard to understand about that simple concept? Instrumentation is good if it's as transparent as possible. Of course lots of other features can be done via a new user-space package ... Thanks, Ingo