From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756755AbZBRWK7 (ORCPT ); Wed, 18 Feb 2009 17:10:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752319AbZBRWKu (ORCPT ); Wed, 18 Feb 2009 17:10:50 -0500 Received: from casper.infradead.org ([85.118.1.10]:38693 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751712AbZBRWKt (ORCPT ); Wed, 18 Feb 2009 17:10:49 -0500 Subject: Re: [PATCH] new irq tracer From: Peter Zijlstra To: "Frank Ch. Eigler" Cc: Jason Baron , mingo@elte.hu, rostedt@goodmis.org, linux-kernel@vger.kernel.org, acme@ghostprotocols.net, fweisbec@gmail.com, compudj@krystal.dyndns.org In-Reply-To: <20090218220201.GG24507@redhat.com> References: <20090218195328.GA3112@redhat.com> <1234991725.4799.1.camel@laptop> <20090218213545.GB3112@redhat.com> <1234993580.4799.11.camel@laptop> <20090218220201.GG24507@redhat.com> Content-Type: text/plain Date: Wed, 18 Feb 2009 23:10:35 +0100 Message-Id: <1234995035.4799.14.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.25.91 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2009-02-18 at 17:02 -0500, Frank Ch. Eigler wrote: > > I really am having a difficult time seeing the use in such narrow > > tracers. > > Part of the problem may come from defining "tracers" as something > limited to ftrace engines. Once such tracepoints are in the kernel, > more powerful analytical tools may be attached to them. ftrace graph tracer is by far the most powerful thing I've seen, there's nothing limiting about ftrace. What is limiting are these puny little tracers that have no real value. A much better purpose for these tracepoints would be augmenting data in existing tracers like the graph/function/sched tracer.