linux-kernel - Re: [printk] fbc14616f4: BUG:kernel_reboot-without-warning_in_test

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Message-ID: <20170517131314.GC8621@pathway.suse.cz>
Date:   Wed, 17 May 2017 15:13:14 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>, Jan Kara <jack@...e.cz>,
        Pavel Machek <pavel@....cz>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Ye Xiaolong <xiaolong.ye@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Len Brown <len.brown@...el.com>,
        linux-kernel@...r.kernel.org, lkp@...org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [printk]  fbc14616f4:
 BUG:kernel_reboot-without-warning_in_test_stage

On Mon 2017-05-08 15:37:41, Sergey Senozhatsky wrote:
> Hello,
> 
> On (04/07/17 10:40), Steven Rostedt wrote:
> [..]
> > On Fri, 7 Apr 2017 14:44:55 +0200
> > Pavel Machek <pavel@....cz> wrote:
> > 
> > > Well, I have to agree here. This is 20 years worth of mess :-(.
> > 
> > Maybe someone should propose a micro-conf at Linux Plumbers where we
> > can brain storm a way to re-invent printk()? Seems it can do with a
> > completely new rewrite. ;-)
> 
> So I've been thinking about it... I'm somewhat limited in budget this
> year and can do either LPC or KS* - purely depending on which one can
> "attract" a required critical mass. From _this_ point of view KS,
> perhaps, would be more appropriate, especially given that it's in EU
> this year, if I'm not mistaken. But LPC has its own merits too, of
> course. LPC's microconference sounds good enough.
> 
> What do you guys think?
> 
> 
> * I obviously don't expect to be invited to the KS, all I said is that
>   I can be in Prague around that time so we can sit somewhere and talk.

I live in Prague and will be happy to discuss printk issues with
interested people.

I think about rewriting printk from time to time. Some brainstorming
might be helpful. On the other hand, I have become aware of many new printk
limits and deficiencies last year. The more I know the less I am sure
that I know enough for making a good design. I would personally prefer
to give it some longer time to gather information. Especially I am
interested into more feedback about the printk kthread and console
work offloading. Also I still do not have enough experience about
how different consoles are used and behave.

Best Regards,
Petr