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

Måns Rullgård
2014-04-03T11:25:46Z

Jiri Kosina <jkosina@suse.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@mansr.com