linux-kernel - Re: [RFC][PATCH] printk: increase devkmsg write() ratelimit

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Message-ID: <20181218150313.GI7485@zn.tnic>
Date:   Tue, 18 Dec 2018 16:03:13 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] printk: increase devkmsg write() ratelimit

On Tue, Dec 18, 2018 at 11:55:58PM +0900, Sergey Senozhatsky wrote:
> Good question. Theoretically, there can be some interesting stuff.
> Examples: https://bugzilla.redhat.com/show_bug.cgi?id=1515373#c6
> or        https://github.com/systemd/systemd/issues/5433

Just like that last page says, people should use the printk.devkmsg=
option when they wanna see all messages. Normally, we do add cmdline
options to the kernel cmdline when debugging, like

debug ignore_loglevel log_buf_len=16M ...

etc and this is no different AFAICT.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.