From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753953AbYKATNl (ORCPT ); Sat, 1 Nov 2008 15:13:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752392AbYKATNe (ORCPT ); Sat, 1 Nov 2008 15:13:34 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.124]:43930 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752177AbYKATNd (ORCPT ); Sat, 1 Nov 2008 15:13:33 -0400 Date: Sat, 1 Nov 2008 15:13:32 -0400 (EDT) From: Steven Rostedt X-X-Sender: rostedt@gandalf.stny.rr.com To: Peter Zijlstra cc: Ingo Molnar , linux-kernel Subject: Re: [PATCH] ftrace: ftrace_dump_on_oops=[tracer] In-Reply-To: <1225565857.21456.51.camel@lappy.programming.kicks-ass.net> Message-ID: References: <1225544744.21456.38.camel@lappy.programming.kicks-ass.net> <1225565857.21456.51.camel@lappy.programming.kicks-ass.net> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) 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 On Sat, 1 Nov 2008, Peter Zijlstra wrote: > On Sat, 2008-11-01 at 14:43 -0400, Steven Rostedt wrote: > > On Sat, 1 Nov 2008, Peter Zijlstra wrote: > > > > > seems useful to debug crashes that happen before I read userspace. > > > > Hmm, I think it might be better to separate this from the dump_on_oops. > > How about a ftrace_default_tracer parameter? > > > > If one is defined, it is activated as soon as it is initialized. This way > > we decouple the dump_on_oops, which we may not always want, and a way to > > start tracers before the switch to user space. > > Like so? Sure. > > --- > Subject: ftrace: enable setting an ftrace tracer on boot > > In order to facilitate early boot trouble, allow one to specify a tracer > on the kernel boot line. > > Signed-off-by: Peter Zijlstra Acked-by: Steven Rostedt -- Steve