From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755430AbZBRWYT (ORCPT ); Wed, 18 Feb 2009 17:24:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751921AbZBRWYJ (ORCPT ); Wed, 18 Feb 2009 17:24:09 -0500 Received: from mx2.redhat.com ([66.187.237.31]:59043 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751580AbZBRWYH (ORCPT ); Wed, 18 Feb 2009 17:24:07 -0500 Date: Wed, 18 Feb 2009 17:23:16 -0500 From: "Frank Ch. Eigler" To: Peter Zijlstra Cc: Jason Baron , mingo@elte.hu, rostedt@goodmis.org, linux-kernel@vger.kernel.org, acme@ghostprotocols.net, fweisbec@gmail.com, compudj@krystal.dyndns.org Subject: Re: [PATCH] new irq tracer Message-ID: <20090218222316.GH24507@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> <1234995035.4799.14.camel@laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1234995035.4799.14.camel@laptop> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi - On Wed, Feb 18, 2009 at 11:10:35PM +0100, Peter Zijlstra 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 [...] Be that as it may, what you suggested required separate correlation of data with /proc/interrupts contents. > What is limiting are these puny little tracers that have no real value. Which limited resource would even puny tracers exhaust? > A much better purpose for these tracepoints would be augmenting data in > existing tracers like the graph/function/sched tracer. Be more specific. How would you augment those tracers with e.g. individual irq numbers, their disposition status (HANDLED etc.). - FChE