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

From: Jiri Kosina
Date: Wed Apr 02 2014 - 19:23:37 EST

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?).

Jiri Kosina

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