linux-kernel - Re: [PATCH] printk: Add loglevel for "do not print to consoles".

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Message-ID: <20200428121828.GP28637@dhcp22.suse.cz>
Date:   Tue, 28 Apr 2020 14:18:28 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, Dmitry Safonov <dima@...sta.com>,
        Yafang Shao <laoar.shao@...il.com>
Subject: Re: [PATCH] printk: Add loglevel for "do not print to consoles".

On Tue 28-04-20 20:33:21, Tetsuo Handa wrote:
> On 2020/04/27 15:21, Sergey Senozhatsky wrote:
> >> KERN_NO_CONSOLES is for type of messages where "saved for later analysis" is
> >> important but "printed for immediate notification" is not important.
> >> In other words, KERN_NO_CONSOLES is NOT for dying messages where "printed for
> >> immediate notification" is important.
> > 
> > per-console loglevel is a user configurable parameter.
> > KERN_NO_CONSOLES is a hard-coded policy.
> 
> But given that whether to use KERN_NO_CONSOLES is configurable via e.g. sysctl,
> KERN_NO_CONSOLES will become a user configurable parameter. What's still wrong?

How do I as a kernel developer know that KERN_NO_CONSOLES should be
used? In other words, how can I assume what a user will consider
important on the console?

-- 
Michal Hocko
SUSE Labs