From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756572AbcLORUe (ORCPT ); Thu, 15 Dec 2016 12:20:34 -0500 Received: from smtprelay0167.hostedemail.com ([216.40.44.167]:42921 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755141AbcLORUc (ORCPT ); Thu, 15 Dec 2016 12:20:32 -0500 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Spam-Summary: 30,2,0,,d41d8cd98f00b204,rostedt@goodmis.org,:::::::::::,RULES_HIT:41:355:379:541:599:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1437:1515:1516:1518:1534:1539:1593:1594:1711:1730:1747:1777:1792:2393:2553:2559:2562:2693:2892:2987:3138:3139:3140:3141:3142:3352:3622:3865:3866:3867:3868:3870:3871:3872:3874:4250:5007:6261:7875:10010:10400:10848:10967:11232:11658:11914:12740:12760:12895:13069:13311:13357:13439:14096:14097:14181:14659:14721:21080:21324:21433:30054:30075:30090:30091,0,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:0:1:0,LFtime:2,LUA_SUMMARY:none X-HE-Tag: spade80_3e63d0cc8cc18 X-Filterd-Recvd-Size: 1922 Date: Thu, 15 Dec 2016 12:20:27 -0500 From: Steven Rostedt To: Peter Zijlstra Cc: Petr Mladek , Andrew Morton , Linus Torvalds , Sergey Senozhatsky , linux-kernel@vger.kernel.org Subject: Re: [PATCH] MAINTAINERS: Add printk maintainers Message-ID: <20161215122027.0f18bfb1@gandalf.local.home> In-Reply-To: <20161215171200.GY3124@twins.programming.kicks-ass.net> References: <1481798878-31898-1-git-send-email-pmladek@suse.com> <20161215084815.4d479755@gandalf.local.home> <20161215143443.GA1053@pathway.suse.cz> <20161215171200.GY3124@twins.programming.kicks-ass.net> X-Mailer: Claws Mail 3.14.0 (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 Thu, 15 Dec 2016 18:12:00 +0100 Peter Zijlstra wrote: > On Thu, Dec 15, 2016 at 03:34:43PM +0100, Petr Mladek wrote: > > We have to find the right balance. For example, we do not show > > messages immediately in NMI context because there is a risk > > of a deadlock. > > I find the occasional deadlock much preferable to guaranteed no output. Right, we can't stress the importance of getting output out when it happens. A printk dump is the first course of action when debugging a crash. And the printk output shows how much progress the computer made. If all printks are asynchronous, that will be unreliable information. And really, that information can be extremely useful, but only if it is reliable, otherwise, it becomes useless. -- Steve