From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Petr Mladek <pmladek@suse.com>,
Dmitry Vyukov <dvyukov@google.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] printk: Add caller information to printk() output.
Date: Tue, 4 Dec 2018 19:38:36 +0900 [thread overview]
Message-ID: <20181204103836.GB530@jagdpanzerIV> (raw)
In-Reply-To: <be668360-279b-5c24-4fc1-10ef050bd87f@i-love.sakura.ne.jp>
On (12/04/18 19:16), Tetsuo Handa wrote:
> On 2018/12/04 11:02, Sergey Senozhatsky wrote:
> > On (12/02/18 20:23), Tetsuo Handa wrote:
> >>
> >> Some examples for console output:
> >>
> >> [ 0.919699]@T1 x86: Booting SMP configuration:
> >> [ 4.152681]@T271 Fusion MPT base driver 3.04.20
> >> [ 5.070470]@C0 random: fast init done
> >> [ 6.587900]@C3 random: crng init done
> >
> > This is hard to read. Let's have a fixed width space for from_id.
>
> Console might be only 80 columns. When we have to check from screen capture of
> crash, triggering needless newlines due to occupying columns more than needed
> will not be nice. Also, syzbot has file size limit for saving console output.
> Wasting with needless spaces increases possibility of loosing past lines.
> Given that said, do you still want to waste precious columns with spaces?
Well, if the feature will be useful for non-syzbot cases as well, as
you mention below, then I'd say let's make the output human readable.
To some extent, at least.
I think we consume much more bytes on pr_fmt prefixes; and not all of them
are very useful all the time.
[..]
[ 1.223872] nouveau 0000:01:00.0: DRM: DCB outp 00: 01000f02 00020030
[ 1.224090] nouveau 0000:01:00.0: DRM: DCB outp 01: 02011f62 00020010
[..]
[ 2.676030] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC662 rev3: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:line
[ 2.676643] snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ 2.677258] snd_hda_codec_realtek hdaudioC0D0: hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
[ 2.677879] snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0
[ 2.678578] snd_hda_codec_realtek hdaudioC0D0: inputs:
[ 2.679150] snd_hda_codec_realtek hdaudioC0D0: Front Mic=0x19
[..]
[ 430.768498] rndis_host 1-1:1.0 enp0s20f0u1: unregister 'rndis_host' usb-0000:00:14.0-1, RNDIS device
So, to me, PRINTK_FROM probably does not look like a really bad
serial console abuser. How many bytes do we need for PRINTK_FROM?
7-8?
> CONFIG_DEBUG_AID_FOR_SYZBOT is currently linux-next only option.
> This feature will be useful for non-syzbot environments.
-ss
next prev parent reply other threads:[~2018-12-04 10:38 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-24 7:37 [PATCH] printk: Add caller information to printk() output Tetsuo Handa
2018-11-30 15:40 ` Petr Mladek
2018-12-01 14:44 ` Tetsuo Handa
2018-12-02 11:23 ` Tetsuo Handa
2018-12-04 2:02 ` Sergey Senozhatsky
2018-12-04 10:16 ` Tetsuo Handa
2018-12-04 10:38 ` Sergey Senozhatsky [this message]
2018-12-04 15:31 ` Petr Mladek
2018-12-03 15:06 ` Petr Mladek
2018-12-03 21:10 ` Tetsuo Handa
2018-12-04 15:27 ` Petr Mladek
2018-12-05 10:42 ` Tetsuo Handa
2018-12-05 11:50 ` Sergey Senozhatsky
2018-12-07 4:58 ` Tetsuo Handa
2018-12-07 5:31 ` Sergey Senozhatsky
2018-12-10 13:09 ` Petr Mladek
2018-12-10 14:01 ` Tetsuo Handa
2018-12-11 10:26 ` Tetsuo Handa
2018-12-12 2:25 ` Sergey Senozhatsky
2018-12-12 2:29 ` Sergey Senozhatsky
2018-12-13 12:18 ` Petr Mladek
2018-12-13 12:42 ` Sergey Senozhatsky
2018-12-17 14:54 ` Petr Mladek
2018-12-17 15:40 ` Sergey Senozhatsky
2018-12-17 21:05 ` Tetsuo Handa
2018-12-18 8:39 ` Petr Mladek
2018-12-18 8:58 ` Sergey Senozhatsky
2019-01-02 16:09 ` Dmitry Vyukov
2019-01-03 18:27 ` Dmitry Vyukov
2019-01-04 7:33 ` Fengguang Wu
2019-01-11 19:34 ` Kevin Hilman
2019-01-10 11:27 ` Tetsuo Handa
2018-12-18 8:55 ` Sergey Senozhatsky
2018-12-18 10:01 ` Petr Mladek
2018-12-18 10:10 ` Sergey Senozhatsky
2019-03-21 2:59 ` Michael Ellerman
2019-03-21 10:20 ` Petr Mladek
2019-03-22 0:48 ` Michael Ellerman
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