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From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: torvalds@linux-foundation.org, sergey.senozhatsky.work@gmail.com
Cc: pavel@ucw.cz, sergey.senozhatsky@gmail.com, pmladek@suse.com,
	rostedt@goodmis.org, jack@suse.cz, akpm@linux-foundation.org,
	jslaby@suse.com, andi@lisas.de, linux-kernel@vger.kernel.org
Subject: Re: printk: what is going on with additional newlines?
Date: Wed, 30 Aug 2017 05:41:20 +0900	[thread overview]
Message-ID: <201708300541.IHE65621.SFMHVFOQOOtJFL@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <CA+55aFyzR4LKhJKLFgvvd9OTsos2_g4-9fova782BX4kyA3bLA@mail.gmail.com>

Linus Torvalds wrote:
> On Tue, Aug 29, 2017 at 10:00 AM, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
> >
> > I refuse to help those things. We mis-designed things
> 
> Actually, let me rephrase that:
> 
> It might actually be a good idea to help those things, by making
> helper functions available that do the marshalling.
> 
> So not calling "printk()" directly, but having a set of simple
> "buffer_print()" functions where each user has its own buffer, and
> then the "buffer_print()" functions will help people do nicely output
> data.
> 
> So if the issue is that people want to print (for example) hex dumps
> one character at a time, but don't want to have each character show up
> on a line of their own, I think we might well add a few functions to
> help dop that.
> 
> But they wouldn't be "printk". They would be the buffering functions
> that then call printk when tyhey have buffered a line.
> 
> That avoids the whole nasty issue with printk - printk wants to show
> stuff early (because _maybe_ it's critical) and printk wants to make
> log records with timestamps and loglevels. And printk has serious
> locking issues that are really nasty and fundamental.
> 
> A private buffer has none of those issues.

Yes, I posted "[PATCH] printk: Add best-effort printk() buffering." at
http://lkml.kernel.org/r/1493560477-3016-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp .

> 
>                  Linus
> 

  reply	other threads:[~2017-08-29 20:41 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 [this message]
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
2017-09-01  7:29         ` Pavel Machek
2017-09-01 11:13           ` Steven Rostedt

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