From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965198AbaLMFsf (ORCPT ); Sat, 13 Dec 2014 00:48:35 -0500 Received: from smtprelay0037.hostedemail.com ([216.40.44.37]:34235 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S965106AbaLMFse (ORCPT ); Sat, 13 Dec 2014 00:48:34 -0500 X-Session-Marker: 6E657665747340676F6F646D69732E6F7267 X-Spam-Summary: 2,0,0,,d41d8cd98f00b204,rostedt@goodmis.org,:::::::::::::::::::::::::,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1437:1515:1516:1518:1534:1541:1593:1594:1711:1730:1747:1777:1792:2393:2553:2559:2562:2693:2892:3138:3139:3140:3141:3142:3354:3622:3865:3866:3867:3868:3870:3871:3872:3874:4605:5007:6119:6120:6261:6742:7875:7903:10004:10400:10848:10967:11232:11658:11914:12050:12052:12296:12517:12519:12740:13069:13311:13357:14096:14097:21080,0,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 X-HE-Tag: care18_679a9d9bd8a2a X-Filterd-Recvd-Size: 2978 Date: Sat, 13 Dec 2014 00:48:30 -0500 From: Steven Rostedt To: Thomas Gleixner Cc: LKML , Jiang Liu , x86@kernel.org, Linus Torvalds , Andrew Morton , Bjorn Helgaas , Tony Luck , Borislav Petkov , Joerg Roedel , Marc Zyngier , Yinghai Lu , Alex Williamson Subject: [RFC PATCH 0/2] tracing: The Grinch who stole the stealing of Christmas Message-ID: <20141213004830.792da019@gandalf.local.home> In-Reply-To: <20141212181420.47100d5c@gandalf.local.home> References: <20141212181420.47100d5c@gandalf.local.home> X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.25; 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 Fri, 12 Dec 2014 18:14:20 -0500 Steven Rostedt wrote: > On Fri, 12 Dec 2014 21:35:14 +0100 (CET) > Thomas Gleixner wrote: > > > > We're almost there with x86 but my gut feeling tells me that pushing > > it now is too risky. I rather prefer quiet holidays for all of us than > > the nagging fear that the post holiday inbox will be full of obscure > > bug reports and we then start a chase and bandaid race which will kill > > the well earned recreation in an instant. > > > > > > Though one issue with that is, that for the early boot process > > there is no way to store that information as the tracer gets > > enabled way after init_IRQ(). But there is no reason why the > > tracer could not be enabled before that. All it needs is a > > working memory allocator. Steven? > > > > Now there is another class of problems which might be hard to > > debug. When the machine just boots into a hang, so we dont get a > > ftrace output neither from an oops nor from a console. It would > > be nice if we could have a command line option which prints > > enabled trace points via (early_)printk. That would avoid > > sending out ad hoc printk debug patches which will basically > > provide the same information as the trace_points. That would be > > useful for other hard to debug boot hangs as well. Steven? > > Sure sure, everyone gets a nice calm xmas except for poor Steven who > has to hack on early tracepoints such that this will be ready for 3.20! > > -- Steve (The Grinch who Hacked on Christmas) I guess I can enjoy my Holiday. -- Steve