Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932135AbWINXkA (ORCPT ); Thu, 14 Sep 2006 19:40:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932136AbWINXkA (ORCPT ); Thu, 14 Sep 2006 19:40:00 -0400 Received: from scrub.xs4all.nl ([194.109.195.176]:26527 "EHLO scrub.xs4all.nl") by vger.kernel.org with ESMTP id S932135AbWINXj7 (ORCPT ); Thu, 14 Sep 2006 19:39:59 -0400 Date: Fri, 15 Sep 2006 01:39:27 +0200 (CEST) From: Roman Zippel X-X-Sender: roman@scrub.home To: Ingo Molnar cc: Daniel Walker , Mathieu Desnoyers , linux-kernel@vger.kernel.org, Christoph Hellwig , Andrew Morton , Ingo Molnar , Greg Kroah-Hartman , Thomas Gleixner , Tom Zanussi , ltt-dev@shafik.org, Michel Dagenais Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108 In-Reply-To: <20060914221521.GA23371@elte.hu> Message-ID: References: <20060914135548.GA24393@elte.hu> <20060914171320.GB1105@elte.hu> <20060914181557.GA22469@elte.hu> <20060914202452.GA9252@elte.hu> <1158268113.17467.38.camel@c-67-180-230-165.hsd1.ca.comcast.net> <20060914221521.GA23371@elte.hu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1286 Lines: 31 Hi, On Fri, 15 Sep 2006, Ingo Molnar wrote: > > OTOH I would also like to know what's going in my m68k kernel without > > having to implement some rather complex infrastructure, which I don't > > need otherwise. There hasn't been a single argument so far, why we > > can't have both. > > the argument is very simple: LTT creates strong coupling, it is almost a > set of 350+ system-calls, moved into the heart of the kernel. Once moved > in, it's very hard to remove it. "Why did you remove that trace > information, you broke my LTT script!" You are changing the topic. Nobody said the current LTT tracepoints have to be merged as is. You generalize from a work in progress to static trace points in general. > While with SystemTap the coupling is alot smaller. What guarantees we don't have similiar problems with dynamic tracepoints? As soon as any tracing is merged, users will have some kind of expectation and thus you can expect "Why did you change this source? It broke my SystemTap script!" here as well. bye, Roman - 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/