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

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Date:   Tue, 18 Dec 2018 23:55:58 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        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 (12/18/18 15:26), Borislav Petkov wrote:
> On Tue, Dec 18, 2018 at 10:07:50PM +0900, Sergey Senozhatsky wrote:
> > This is right before shutdown. dmesg is not really available anymore.
> > I can only guess why do they write it to devkmsg - to make it appear
> > on the serial/net console, perhaps. Dunno.
> 
> But still, why do we want to see those messages and enlarge the
> ratelimit for that? Do they contain any particularly important
> information?

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

	-ss