From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754829Ab3HaUbY (ORCPT ); Sat, 31 Aug 2013 16:31:24 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:15696 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752197Ab3HaUbX (ORCPT ); Sat, 31 Aug 2013 16:31:23 -0400 X-Authority-Analysis: v=2.0 cv=V4T/IJbi c=1 sm=0 a=Sro2XwOs0tJUSHxCKfOySw==:17 a=Drc5e87SC40A:10 a=ScsRa3LQXiAA:10 a=5SG0PmZfjMsA:10 a=IkcTkHD0fZMA:10 a=meVymXHHAAAA:8 a=KGjhK52YXX0A:10 a=oRCXbKhWxsoA:10 a=VnNF1IyMAAAA:8 a=xa5-QLw5uhaX3KhGc6EA:9 a=QEXdDO2ut3YA:10 a=jeBq3FmKZ4MA:10 a=Sro2XwOs0tJUSHxCKfOySw==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 67.255.60.225 Subject: Re: [RFC][PATCH 08/18 v2] ftrace/rcu: Do not trace debug_lockdep_rcu_enabled() From: Steven Rostedt To: paulmck@linux.vnet.ibm.com Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Andrew Morton , Peter Zijlstra , Frederic Weisbecker , Jiri Olsa In-Reply-To: <20130831192101.GG3871@linux.vnet.ibm.com> References: <20130831051117.884125230@goodmis.org> <20130831051701.767976027@goodmis.org> <20130831192101.GG3871@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" Date: Sat, 31 Aug 2013 16:31:14 -0400 Message-ID: <1377981074.26624.0.camel@pippen.local.home> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2013-08-31 at 12:21 -0700, Paul E. McKenney wrote: > On Sat, Aug 31, 2013 at 01:11:25AM -0400, Steven Rostedt wrote: > > From: "Steven Rostedt (Red Hat)" > > > > The function debug_lockdep_rcu_enabled() is part of the RCU lockdep > > debugging, and is called very frequently. I found that if I enable > > a lot of debugging and run the function graph tracer, this > > function can cause a live lock of the system. > > > > We don't usually trace lockdep infrastructure, no need to trace > > this either. > > > > Cc: Paul E. McKenney > > Signed-off-by: Steven Rostedt > > Reviewed-by: Paul E. McKenney > > Or I can just take it, if you would rather. (If so, 3.12 or 3.13?) > Feel free to take it and I'll remove it from my queue. 3.12 please. I'll just need to remember to turn off function graph tracing when testing these patches again. -- Steve