Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757259AbYJWQlh (ORCPT ); Thu, 23 Oct 2008 12:41:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753141AbYJWQl2 (ORCPT ); Thu, 23 Oct 2008 12:41:28 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:51230 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752749AbYJWQl1 (ORCPT ); Thu, 23 Oct 2008 12:41:27 -0400 Date: Thu, 23 Oct 2008 18:40:32 +0200 From: Ingo Molnar To: Steven Rostedt Cc: Jan Kiszka , linux-kernel@vger.kernel.org, Frederic Weisbecker , Abhishek Sagar , "David S. Miller" , Thomas Gleixner , Peter Zijlstra , Andrew Morton , Linus Torvalds , Steven Rostedt Subject: Re: [PATCH 08/13 v2] ftrace: do not trace init sections Message-ID: <20081023164032.GA19070@elte.hu> References: <20081022212721.167005680@goodmis.org> <20081022213552.440512191@goodmis.org> <49005CD0.2070807@siemens.com> <49008A9B.8040905@siemens.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00,DNS_FROM_SECURITYSAGE autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] 0.0 DNS_FROM_SECURITYSAGE RBL: Envelope sender in blackholes.securitysage.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1116 Lines: 25 * Steven Rostedt wrote: > > I don't know if this feature is already considered for / part of > > mainline, but oops backtraces based on mcount instrumentation used > > to be quite helpful for me to understand the wider context of > > several faults. The more you have to mask out of this picture, the > > harder it gets to match the trace to your model of the kernel > > activities. At least you have to know more in advance about the > > limitation of the tracer... > > The ftrace buffer can be dumped out on oops. I'm not sure if it is > always on. If it is, I need to make it default off and add a command > line and sysctl to turn it on. Otherwise, we will have people > complaining about the extra output to the console on oops. it dumps currently if a tracer is enabled. I saw it a couple of times already during crashes. Ingo -- 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/