From: Joe Perches <joe@perches.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>, Jan Kara <jack@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
Jiri Slaby <jslaby@suse.com>, Andreas Mohr <andi@lisas.de>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: printk: what is going on with additional newlines?
Date: Fri, 01 Sep 2017 00:23:33 -0700 [thread overview]
Message-ID: <1504250613.2361.5.camel@perches.com> (raw)
In-Reply-To: <20170901065925.GA12104@amd>
On Fri, 2017-09-01 at 08:59 +0200, Pavel Machek wrote:
> On Thu 2017-08-31 19:04:24, Joe Perches wrote:
> > On Fri, 2017-09-01 at 10:40 +0900, Sergey Senozhatsky wrote:
> > > On (08/29/17 22:24), Pavel Machek wrote:
> > > > > > In 4.13-rc, printk("foo"); printk("bar"); seems to produce
> > > > > > foo\nbar. That's... quite surprising/unwelcome. What is going on
> > > > > > there? Are timestamps responsible?
> > []
> > > > You are welcome not add checkpatch rules to prevent such code from being
> > > > merged...
> >
> > Pavel, what does this mean?
> That should have been "welcome to".
Right.
Good luck with a checkpatch implementation.
> IMO pr_foo() is bad interface for debugging.
Why?
> I just want to see the data... and difference
> from userspace debugging actually hurts there.
How so? What data is not available?
Making functions of the various pr_<level> uses
makes it easier to insert things like singletons
for any pr_fmt prefix which could save a few KB
and as well allow for centralized mechanisms to
emit logging messages with
%ps, __builtin_return_address(0)
instead of using
"%s <fmt>", __func__, args...
to save even more space.
next prev parent reply other threads:[~2017-09-01 7:23 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-15 2:56 [RFC][PATCHv5 00/13] printk: introduce printing kernel thread Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 01/13] printk: move printk_pending out of per-cpu Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 02/13] printk: introduce printing kernel thread Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 03/13] printk: add sync printk_emergency API Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 04/13] printk: add enforce_emergency parameter Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 05/13] printk: enable printk offloading Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 06/13] printk: register PM notifier Sergey Senozhatsky
2017-08-15 11:51 ` Rafael J. Wysocki
2017-08-16 7:31 ` Sergey Senozhatsky
2017-08-16 12:58 ` Rafael J. Wysocki
2017-08-17 5:55 ` Sergey Senozhatsky
2017-08-17 15:43 ` Rafael J. Wysocki
2017-08-17 23:19 ` Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 07/13] printk: register syscore notifier Sergey Senozhatsky
2017-08-15 11:56 ` Rafael J. Wysocki
2017-08-16 6:55 ` Sergey Senozhatsky
2017-08-16 12:59 ` Rafael J. Wysocki
2017-08-15 2:56 ` [RFC][PATCHv5 08/13] printk: set watchdog_thresh as maximum value for atomic_print_limit Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 09/13] printk: add auto-emergency enforcement mechanism Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 10/13] printk: force printk_kthread to offload printing Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 11/13] printk: always offload printing from user-space processes Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 12/13] printk: do not cond_resched() when we can offload Sergey Senozhatsky
2017-08-15 2:56 ` [RFC][PATCHv5 13/13] printk: move offloading logic to per-cpu Sergey Senozhatsky
2017-08-23 8:33 ` [RFC][PATCHv5 00/13] printk: introduce printing kernel thread Sergey Senozhatsky
2017-08-28 9:05 ` printk: what is going on with additional newlines? Pavel Machek
2017-08-28 10:28 ` Sergey Senozhatsky
2017-08-28 12:21 ` Sergey Senozhatsky
2017-08-28 12:38 ` Sergey Senozhatsky
2017-08-28 12:46 ` Pavel Machek
2017-08-29 13:40 ` Sergey Senozhatsky
2017-08-29 16:37 ` Joe Perches
2017-08-29 17:00 ` Linus Torvalds
2017-08-29 17:12 ` Linus Torvalds
2017-08-29 20:41 ` Tetsuo Handa
2017-08-29 20:51 ` Linus Torvalds
2017-09-02 6:12 ` Tetsuo Handa
2017-09-02 17:06 ` Linus Torvalds
2017-08-29 23:50 ` Steven Rostedt
2017-08-29 23:59 ` Linus Torvalds
2017-08-30 1:03 ` Sergey Senozhatsky
2017-08-30 1:10 ` Steven Rostedt
2017-08-30 1:51 ` Sergey Senozhatsky
2017-08-30 1:52 ` Joe Perches
2017-08-30 2:25 ` Sergey Senozhatsky
2017-08-30 2:31 ` Joe Perches
2017-08-30 2:47 ` Sergey Senozhatsky
2017-08-30 2:58 ` Joe Perches
2017-08-30 5:37 ` Sergey Senozhatsky
2017-09-08 10:18 ` Pavel Machek
2017-09-05 9:44 ` Petr Mladek
2017-09-05 9:59 ` Sergey Senozhatsky
2017-09-05 12:21 ` Petr Mladek
2017-09-05 12:35 ` Tetsuo Handa
2017-09-05 14:18 ` Sergey Senozhatsky
2017-09-05 13:42 ` Sergey Senozhatsky
2017-09-06 7:55 ` Petr Mladek
2017-09-17 6:26 ` Sergey Senozhatsky
2017-09-17 9:27 ` Sergey Senozhatsky
2017-09-17 15:35 ` Linus Torvalds
2017-09-18 0:46 ` Sergey Senozhatsky
2017-09-18 2:22 ` Joe Perches
2017-09-18 2:41 ` Sergey Senozhatsky
2017-09-18 2:45 ` Joe Perches
2017-09-18 2:55 ` Sergey Senozhatsky
2017-09-18 3:07 ` Joe Perches
2017-09-18 4:42 ` Sergey Senozhatsky
2017-09-01 13:19 ` Sergey Senozhatsky
2017-09-01 17:32 ` Joe Perches
2017-09-01 20:21 ` Linus Torvalds
2017-09-04 5:22 ` Sergey Senozhatsky
2017-09-04 5:41 ` Joe Perches
2017-09-05 14:54 ` Steven Rostedt
2017-09-06 2:14 ` Sergey Senozhatsky
2017-09-06 2:36 ` Linus Torvalds
2017-09-04 4:30 ` Sergey Senozhatsky
2017-09-04 5:24 ` Sergey Senozhatsky
2017-08-29 17:33 ` Sergey Senozhatsky
2017-08-29 17:52 ` Linus Torvalds
2017-08-29 18:09 ` Joe Perches
2017-08-30 1:07 ` Sergey Senozhatsky
2017-08-30 0:58 ` Sergey Senozhatsky
2017-08-29 16:48 ` Linus Torvalds
2017-08-29 17:10 ` Joe Perches
2017-08-29 17:20 ` Linus Torvalds
2017-08-29 17:33 ` Joe Perches
2017-08-29 17:36 ` Linus Torvalds
2017-08-29 17:48 ` Joe Perches
2017-08-29 20:24 ` Pavel Machek
2017-09-01 1:40 ` Sergey Senozhatsky
2017-09-01 2:04 ` Joe Perches
2017-09-01 6:59 ` Pavel Machek
2017-09-01 7:23 ` Joe Perches [this message]
2017-09-01 7:29 ` Pavel Machek
2017-09-01 11:13 ` Steven Rostedt
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