From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753387AbaLLXOg (ORCPT ); Fri, 12 Dec 2014 18:14:36 -0500 Received: from smtprelay0133.hostedemail.com ([216.40.44.133]:51765 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752130AbaLLXOf (ORCPT ); Fri, 12 Dec 2014 18:14:35 -0500 X-Session-Marker: 6E657665747340676F6F646D69732E6F7267 X-Spam-Summary: 2,0,0,,d41d8cd98f00b204,rostedt@goodmis.org,:::::::::::::::::::::::::,RULES_HIT:41:355:379:541:599:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1437:1515:1516:1518:1534:1541:1593:1594:1711:1730:1747:1777:1792:2393:2553:2559:2562:2693:2892:3138:3139:3140:3141:3142:3353:3622:3865:3866:3867:3868:3870:3871:3872:3874:4605:5007:6119:6261:6742:7875:7903:10004:10400:10848:10967:11232:11658:11914:12050:12052:12296:12517:12519:12740:13069:13311:13357:14096:14097:21080,0,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: bean34_aa1a7a421029 X-Filterd-Recvd-Size: 2691 Date: Fri, 12 Dec 2014 18:14:20 -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: Re: Status of tip/x86/apic Message-ID: <20141212181420.47100d5c@gandalf.local.home> In-Reply-To: References: 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 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)