From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Michal Hocko <mhocko@kernel.org>, Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
linux-kernel@vger.kernel.org, Dmitry Safonov <dima@arista.com>,
Yafang Shao <laoar.shao@gmail.com>
Subject: Re: [PATCH] printk: Add loglevel for "do not print to consoles".
Date: Wed, 13 May 2020 20:24:24 +0900 [thread overview]
Message-ID: <d66c38d9-dd97-072d-e1a7-949e9573b38d@i-love.sakura.ne.jp> (raw)
In-Reply-To: <20200513104938.GW29153@dhcp22.suse.cz>
On 2020/05/13 19:49, Michal Hocko wrote:
> On Wed 13-05-20 12:04:13, Petr Mladek wrote:
>> What is so special about OOM dump task so that it would deserve such
>> complications?
>
> Nothing really. Except for the potential amount of the output.
"echo t > /proc/sysrq-trigger" from userspace program is another example.
> But as
> you've said there are two ways around that. Disable this output if you
> do not need it or make it a lower loglevel.
Disable this output for syslog is not acceptable for me, but disable this
output for consoles is preferable for me.
> I simply cannot tell whether somebody considers
> dump_tasks an important information to be printed on consoles.
I don't think dump_tasks() is important information to be printed on consoles.
But since somebody might think dump_tasks() is important information to be
printed on consoles, I suggest switching KERN_NO_CONSOLES using e.g. sysctl.
>
> If there is any need to control which messages should be routed to which
> backend then the proper solution would be to filter messages per log
> level per backend.
Possible backends will be "zero or more than zero" consoles + "zero or one"
syslog, and KERN_NO_CONSOLES is a method for force selecting "zero" console
backend.
> But I have no idea how feasible this is for the
> existing infrastructure - or maybe it already exists...
There is per-console loglevel proposal (which allows selecting "some" console
backends). But it is based on KERN_$LOGLEVEL which is too rough-grained.
next prev parent reply other threads:[~2020-05-13 11:25 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-24 2:42 [PATCH] printk: Add loglevel for "do not print to consoles" Tetsuo Handa
2020-04-24 13:28 ` Steven Rostedt
2020-04-24 14:00 ` Tetsuo Handa
2020-04-24 14:31 ` Steven Rostedt
2020-04-24 15:28 ` Tetsuo Handa
2020-04-24 15:42 ` Steven Rostedt
2020-04-24 15:52 ` Dmitry Safonov
2020-04-24 16:10 ` Tetsuo Handa
2020-04-24 16:21 ` Steven Rostedt
2020-04-24 16:34 ` Tetsuo Handa
2020-04-25 0:46 ` Sergey Senozhatsky
2020-04-25 1:07 ` Tetsuo Handa
2020-04-27 6:21 ` Sergey Senozhatsky
2020-04-28 11:33 ` Tetsuo Handa
2020-04-28 12:18 ` Michal Hocko
2020-04-28 13:11 ` Tetsuo Handa
2020-04-28 15:45 ` Michal Hocko
2020-04-28 16:23 ` Tetsuo Handa
2020-04-29 14:21 ` Michal Hocko
2020-04-29 16:35 ` Tetsuo Handa
2020-05-13 6:26 ` Sergey Senozhatsky
2020-05-13 7:58 ` Tetsuo Handa
2020-05-13 10:04 ` Petr Mladek
2020-05-13 10:49 ` Michal Hocko
2020-05-13 11:24 ` Tetsuo Handa [this message]
2020-05-13 12:19 ` Petr Mladek
2020-05-13 12:59 ` Tetsuo Handa
2020-05-14 8:00 ` Petr Mladek
2020-05-14 11:23 ` Tetsuo Handa
2020-05-14 16:26 ` Petr Mladek
2020-05-14 23:24 ` Tetsuo Handa
2020-05-13 11:03 ` Tetsuo Handa
2020-05-13 12:34 ` Petr Mladek
2020-05-13 13:46 ` Steven Rostedt
2020-05-13 14:03 ` Tetsuo Handa
2020-05-13 13:55 ` Steven Rostedt
2020-05-13 15:20 ` Tetsuo Handa
2020-05-06 9:45 ` Tetsuo Handa
2020-05-06 15:26 ` Joe Perches
2020-05-07 0:50 ` Tetsuo Handa
2020-05-07 1:02 ` Joe Perches
2020-05-07 5:13 ` Tetsuo Handa
2020-05-07 5:30 ` Joe Perches
2020-05-07 5:39 ` Tetsuo Handa
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