From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 90597475 for ; Fri, 31 Jul 2015 18:55:06 +0000 (UTC) Received: from arcturus.aphlor.org (arcturus.aphlor.org [188.246.204.175]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 248FDE2 for ; Fri, 31 Jul 2015 18:55:06 +0000 (UTC) Date: Fri, 31 Jul 2015 14:17:58 -0400 From: Dave Jones To: Greg KH Message-ID: <20150731181757.GA8747@codemonkey.org.uk> References: <55BAE39F.9060705@oracle.com> <20150731165915.GA4995@roeck-us.net> <20150731170825.GA2721@kroah.com> <20150731171500.GC4995@roeck-us.net> <20150731181245.GA5969@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150731181245.GA5969@kroah.com> Cc: Sasha Levin , "ksummit-discuss@lists.linuxfoundation.org" Subject: Re: [Ksummit-discuss] Self nomination List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Fri, Jul 31, 2015 at 11:12:45AM -0700, Greg Kroah-Hartman wrote: > On Fri, Jul 31, 2015 at 12:51:53PM -0500, Bjorn Helgaas wrote: > > I prefer that a dmesg collected in the simplest possible way, with no > > special config or boot flags, be as useful as possible. So converting > > to dynamic debug requires much more thought about which messages > > should be always printed and which should become dynamic. > > Why would a debugging message ever not be dynamic? They are there for > you to use, and turn off when you are done. If you want a user to > report the output of them, then of course they should be dynamic so they > can just write a line to a debugfs file and then start seeing them This implies a user knows ahead of time what bugs they are going to hit, and which messages they need to enable. For hard-to-reproduce bugs, or bugs that exhibit non-obvious symptoms, this isn't workable. Dave