From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gerrit Binnenmars Subject: Re: CONFIG_CRITICAL_IRQSOFF_TIMING Date: Tue, 30 Oct 2007 22:26:57 +0100 (CET) Message-ID: <25376807.1614051193779617681.JavaMail.www@wwinf6102> Reply-To: gerritbinnenmars@wanadoo.nl Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: linux-rt-users@vger.kernel.org To: Daniel Walker Return-path: Received: from smtp-2.orange.nl ([193.252.22.242]:13729 "EHLO smtp-2.orange.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752651AbXJ3V07 (ORCPT ); Tue, 30 Oct 2007 17:26:59 -0400 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf6108.orange.nl (SMTP Server) with ESMTP id B544070000AE for ; Tue, 30 Oct 2007 22:26:57 +0100 (CET) Sender: linux-rt-users-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org > Datum: 30/10/07 10:11 PM > Van: "Daniel Walker" > Aan: gerritbinnenmars@wanadoo.nl > CC: linux-rt-users@vger.kernel.org > Onderwerp : Re: CONFIG_CRITICAL_IRQSOFF_TIMING > > On Tue, 2007-10-30 at 22:09 +0100, Gerrit Binnenmars wrote: > > > Datum: 30/10/07 10:02 PM > > > Van: "Daniel Walker" > > > Aan: gerritbinnenmars@wanadoo.nl > > > CC: linux-rt-users@vger.kernel.org > > > Onderwerp : Re: CONFIG_CRITICAL_IRQSOFF_TIMING > > > > > > On Tue, 2007-10-30 at 21:52 +0100, Gerrit Binnenmars wrote: > > > > > > > CONFIG_LTT_PROBE_LOCKING=m > > > > # CONFIG_LTT_PROBE_STACK is not set > > > > > > I wonder which kernel your using? I don't recall LTT being part of real > > > time in the past .. What the architecture too ? > > > > Hello Daniel, > > I use version 2.6.22.1-rt4, see the following link for LTT compatibility > > http://ltt.polymtl.ca/svn/ltt/branches/poly/doc/developer/lttng-lttv-compatibility.html > > > > I have used LTT on both i386 an on a PowerPC (MPC8555) architecture. > > It is a great help in understanding real-time behaviour. > > Did you add LTT into your kernel on your own? > > Daniel > > > Daniel, I first applied the rt patchset and then the LTTng patch (http://ltt.polymtl.ca/lttng/patch-2.6.22.1-rt4-lttng-0.9.10.tar.gz). Then LTT can be selected in the Instrumentation part of the config file. further ltt-control is needed (http://ltt.polymtl.ca/lttng/ltt-control-0.43-10082007.tar.gz) The viewer is only working on i386 but that is not really a problem. So, I applied the available patches without doing anything special. Is LTT causing troubles with the preempt_max_latency options? Gerrit