From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751644AbdBICYS (ORCPT ); Wed, 8 Feb 2017 21:24:18 -0500 Received: from smtprelay0045.hostedemail.com ([216.40.44.45]:54700 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751250AbdBICYP (ORCPT ); Wed, 8 Feb 2017 21:24:15 -0500 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Spam-Summary: 2,0,0,,d41d8cd98f00b204,rostedt@goodmis.org,:::::::::::,RULES_HIT:41:355:379:541:599:960:966:973:988:989:1260:1277:1311:1313:1314:1345:1359:1437:1515:1516:1518:1534:1541:1593:1594:1711:1730:1747:1777:1792:1801:2196:2199:2393:2553:2559:2562:2693:3138:3139:3140:3141:3142:3352:3622:3865:3867:3868:3870:3871:3872:3873:3874:4250:4321:4385:4605:5007:6119:6261:7875:7903:10004:10400:10848:10967:11026:11232:11658:11914:12043:12438:12555:12740:12760:12895:12986:13069:13311:13357:13439:14181:14659:14721:21080:21451:30054:30090:30091,0,RBL:none,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:2,LUA_SUMMARY:none X-HE-Tag: elbow31_44ce2960ae50b X-Filterd-Recvd-Size: 2202 Date: Wed, 8 Feb 2017 21:14:31 -0500 From: Steven Rostedt To: Tom Zanussi Cc: tglx@linutronix.de, mhiramat@kernel.org, namhyung@kernel.org, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org Subject: Re: [RFC][PATCH 00/21] tracing: Inter-event (e.g. latency) support Message-ID: <20170208211431.467477f5@grimm.local.home> In-Reply-To: <1486596530.2871.22.camel@tzanussi-mobl.amr.corp.intel.com> References: <20170208150109.5919a2ea@gandalf.local.home> <1486596530.2871.22.camel@tzanussi-mobl.amr.corp.intel.com> X-Mailer: Claws Mail 3.14.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 08 Feb 2017 17:28:50 -0600 Tom Zanussi wrote: > On Wed, 2017-02-08 at 15:01 -0500, Steven Rostedt wrote: > > On Wed, 8 Feb 2017 11:24:56 -0600 > > Tom Zanussi wrote: > > > > > # echo 'wakeup_latency lat=sched_switch:wakeup_lat \ > > > pid=sched_switch:woken_pid \ > > > prio=sched_switch:woken_prio' >> \ > > > /sys/kernel/debug/tracing/synthetic_events > > > > I applied all your patches, did the above and then: > > > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000034 > > IP: free_synthetic_event+0x46/0xb0 > > PGD 0 > > > > OK, well, the problem is actually the '\' 'continuation' characters in > the above string. I'll fix that properly, but in the meantime, removing > those chars in the documentation strings will let you try it out i.e. > > # echo 'wakeup_latency lat=sched_switch:wakeup_lat pid=sched_switch:woken_pid prio=sched_switch:woken_prio' >> /sys/kernel/debug/tracing/synthetic_events Ah, OK. Yeah, I did a cut and paste when entering it. -- Steve