linux-kernel - Re: [RFC PATCH] cmdline: Hide "debug" from /proc/cmdline

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Date:	Fri, 4 Apr 2014 11:42:51 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"Theodore Ts'o" <tytso@....edu>, Joerg Roedel <joro@...tes.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mateusz Guzik <mguzik@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
	Ingo Molnar <mingo@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Kay Sievers <kay@...y.org>
Subject: Re: [RFC PATCH] cmdline: Hide "debug" from /proc/cmdline

On Fri, Apr 4, 2014 at 11:21 AM, Andy Lutomirski <luto@...capital.net> wrote:
>
> I'm using /dev/kmsg in virtme so that I can easily capture, with
> timestamps, the ten or so log lines that it produces.  It would be sad
> if I had to worry about small ratelimits here.

So the _default_ rate limits (which is what my example patch used) are
almost certainly not appropriate for /dev/kmsg.

It would be good to hear suggestions for what *would* be reasonable.
Because it does sound like we'll have to add rate limiting.

Most users will never notice. The whole "writable /dev/kmsg" may go
back to 2002, but there aren't _that_ many users, and pretty much all
I've ever seen tend to write the occasional "I started up" messages or
other very small notes. I had to write a test-script to trigger even
the (very draconian) default ratelimits.

                 Linus
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