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From: Linus Torvalds <torvalds@linux-foundation.org>
To: sergey.senozhatsky.work@gmail.com
Cc: penguin-kernel@i-love.sakura.ne.jp,
	Petr Mladek <pmladek@suse.com>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	dvyukov@google.com, Steven Rostedt <rostedt@goodmis.org>,
	glider@google.com, fengguang.wu@intel.com, jpoimboe@redhat.com,
	Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Will Deacon <will.deacon@arm.com>
Subject: Re: [PATCH 3/3] lockdep: Use line-buffered printk() for lockdep messages.
Date: Fri, 9 Nov 2018 08:08:13 -0600	[thread overview]
Message-ID: <CAHk-=wizC7pn=+F5kNWaz65hb=meyVGLgkGGfZ82mNXp=-E=tQ@mail.gmail.com> (raw)
In-Reply-To: <20181109061204.GC599@jagdpanzerIV>

On Fri, Nov 9, 2018 at 12:12 AM Sergey Senozhatsky
<sergey.senozhatsky.work@gmail.com> wrote:
>
> Dunno. I guess we still haven't heard from Linus because he did quite a good
> job setting up his 'email filters' ;)

Not filters, just long threads that I lurk on.

I don't actually care too much about this - the part I care about is
that when panics etc happen, things go out with a true best effort.

And "best effort" actually means "reality", not "theory". I don't care
one whit for some broken odd serial console that has a lock and
deadlocks if you get a panic just in the right place. I care about the
main printk/tty code doing the right thing, and avoiding the locks
with the scheduler and timers etc. So the timestamping and wakeup code
needing locks - or thinking you can delay things and print them out
later (when no later happens because you're panicing in an NMI) -
*that* is what I care deeply about.

Something like having a line buffering interface for random debugging
messages etc, I just don't get excited about. It just needs to be
simple enough and robust enough. You guys seem to be talking it out
ok.

             Linus

  parent reply	other threads:[~2018-11-09 14:15 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-02 13:31 [PATCH v6 1/3] printk: Add line-buffered printk() API Tetsuo Handa
2018-11-02 13:31 ` [PATCH 2/3] mm: Use line-buffered printk() for show_free_areas() Tetsuo Handa
2018-11-07 14:07   ` Petr Mladek
2018-11-02 13:31 ` [PATCH 3/3] lockdep: Use line-buffered printk() for lockdep messages Tetsuo Handa
2018-11-02 13:36   ` Peter Zijlstra
2018-11-03  2:00     ` Tetsuo Handa
2018-11-06  8:38     ` Petr Mladek
2018-11-06  9:05       ` Sergey Senozhatsky
2018-11-06 12:57         ` Petr Mladek
2018-11-06  9:56       ` Tetsuo Handa
2018-11-07 15:19   ` Petr Mladek
2018-11-08  4:45     ` Sergey Senozhatsky
2018-11-08 11:37       ` Tetsuo Handa
2018-11-09  6:12         ` Sergey Senozhatsky
2018-11-09  9:55           ` Tetsuo Handa
2018-11-09 15:43             ` Petr Mladek
2018-11-10  2:42               ` Tetsuo Handa
2018-11-23 12:46                 ` Petr Mladek
2018-11-23 13:12                   ` Tetsuo Handa
2018-11-23 15:56                   ` Steven Rostedt
2018-11-24  0:24                     ` Tetsuo Handa
2018-11-26  4:34                       ` Sergey Senozhatsky
2018-11-28 13:29                     ` David Laight
2018-11-29 10:09                       ` Tetsuo Handa
2018-11-30 16:01                         ` Petr Mladek
2018-11-10  8:52               ` Tetsuo Handa
2018-11-23 12:52                 ` Petr Mladek
2018-11-09 14:08           ` Linus Torvalds [this message]
2018-11-09 14:42             ` Steven Rostedt
2018-11-08 11:53       ` Petr Mladek
2018-11-08 12:44         ` Sergey Senozhatsky
2018-11-08 14:21           ` Sergey Senozhatsky
2018-11-09  9:54     ` Tetsuo Handa
2018-11-02 14:40 ` [PATCH v6 1/3] printk: Add line-buffered printk() API Matthew Wilcox
2018-11-03  1:55   ` Tetsuo Handa
2018-11-02 18:12 ` kbuild test robot
2018-11-02 18:12   ` kbuild test robot
2018-11-06 14:35 ` Sergey Senozhatsky
2018-11-07 10:21   ` Petr Mladek
2018-11-07 12:54     ` Tetsuo Handa
2018-11-08  2:21     ` Sergey Senozhatsky
2018-11-08 11:24       ` Petr Mladek
2018-11-08 11:46         ` Tetsuo Handa
2018-11-08 12:30         ` Sergey Senozhatsky
2018-11-09 14:10           ` Petr Mladek
2018-11-12  7:59             ` Sergey Senozhatsky
2018-11-12 10:42               ` Tetsuo Handa
2018-11-17 10:14               ` Tetsuo Handa
2018-11-07 10:52   ` Tetsuo Handa
2018-11-07 11:01     ` David Laight
2018-11-07 12:00       ` Petr Mladek
2018-11-07 11:45     ` Petr Mladek
2018-11-08  2:30     ` Sergey Senozhatsky
2018-11-07 13:41 ` Petr Mladek
2018-11-07 14:06 ` Petr Mladek

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