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

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Date:	Thu, 03 Apr 2014 12:25:40 +0100
From:	Måns Rullgård <mans@...sr.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Linus Torvalds <torvalds@...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>,
	Andrew Morton <akpm@...ux-foundation.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

Jiri Kosina <jkosina@...e.cz> writes:

> On Wed, 2 Apr 2014, Linus Torvalds wrote:
>
>> Steven, Borislav, one thing that strikes me might be a good idea is to 
>> limit the amount of non-kernel noise in dmesg. We already have the 
>> concept of rate-limiting various spammy internal kernel messages for 
>> when device drivers misbehave etc. Maybe we can just add rate-limiting 
>> to the interfaces that add messages to the kernel buffers, and work 
>> around this problem that way instead while waiting for Gregs fix to 
>> percolate? Or are the systemd debug messages going to so many other 
>> places too that that wouldn't really help?
>
> I think that it's in principle a good idea, however ... the in-kernel 
> ratelimiting always happens per sourcecode location, but this will be 
> rather hard to achieve with interface such as /dev/kmsg.
>
> If /dev/kmsg is going to be ratelimited as a whole, it might potentially 
> create a severely unfair situation between individual userspace programs 
> trying to do logging (although there is apparently only one userspace 
> service doing any logging through this interface whatsoever, right?).

The point is that /dev/kmsg is *not* intended as a syslog replacement.

-- 
Måns Rullgård
mans@...sr.com
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