Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932518AbZDCQno (ORCPT ); Fri, 3 Apr 2009 12:43:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755646AbZDCQne (ORCPT ); Fri, 3 Apr 2009 12:43:34 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.125]:61943 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755479AbZDCQnd (ORCPT ); Fri, 3 Apr 2009 12:43:33 -0400 Date: Fri, 3 Apr 2009 12:43:15 -0400 (EDT) From: Steven Rostedt X-X-Sender: rostedt@gandalf.stny.rr.com To: Ingo Molnar cc: "Paul E. McKenney" , Tom Zanussi , linux-kernel , fweisbec@gmail.com Subject: Re: [PATCH] tracing/filters: allow event filters to be set only when not tracing In-Reply-To: <20090403163755.GA3047@elte.hu> Message-ID: References: <1238390546.6368.65.camel@bookworm> <20090401122408.GG12966@elte.hu> <1238653371.6655.48.camel@bookworm> <20090403135956.GD8875@elte.hu> <20090403162642.GB6968@linux.vnet.ibm.com> <20090403163755.GA3047@elte.hu> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 786 Lines: 23 On Fri, 3 Apr 2009, Ingo Molnar wrote: > > > > My kneejerk reaction is "why would anyone want to trace the idle > > loop?" > > heh :-) > > Idle enter/exit events are useful to tune power use for example. The > more events we have there, the more we prevent the CPU from slowly > going into deep sleep mode. I can say I use it a lot. I'm still needing a way to set the function pid recorder to 0 since the conversion to the pid structure. There are times I only want to trace the interrupts that happen in the idle loop. -- Steve -- 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/