From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755315Ab0ETLt1 (ORCPT ); Thu, 20 May 2010 07:49:27 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:34867 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755041Ab0ETLtZ (ORCPT ); Thu, 20 May 2010 07:49:25 -0400 Date: Thu, 20 May 2010 13:48:51 +0200 From: Ingo Molnar To: Thomas Gleixner Cc: Frederic Weisbecker , Steven Rostedt , LKML , Linus Torvalds , Andrew Morton , Peter Zijlstra , Christoph Hellwig , Mathieu Desnoyers , Li Zefan , Lai Jiangshan , Johannes Berg , Masami Hiramatsu , Arnaldo Carvalho de Melo , Tom Zanussi , KOSAKI Motohiro , Andi Kleen , Masami Hiramatsu , Lin Ming , Cyrill Gorcunov , Mike Galbraith , Paul Mackerras , Hitoshi Mitake , Robert Richter Subject: Re: [RFD] Future tracing/instrumentation directions Message-ID: <20100520114851.GA17860@elte.hu> References: <1274291514.26328.930.camel@gandalf.stny.rr.com> <20100520093131.GA30929@elte.hu> <20100520100732.GD5309@nowhere> <20100520114218.GA15531@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100520114218.GA15531@elte.hu> 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 * Ingo Molnar wrote: > > as long as the tool is built in a way that it does not > > need updates when we add trace points or other > > functionality to the kernel. > > Yeah, most definitely. The sysfs event_source class will > ensure that whatever (new) events are available > propagate through the tool and are available to it. Note that this approach isnt just for tools/perf/, it will be useful for other perf events based tools as well: SysProf and for the libpfm based apps. Ingo