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

Peter Zijlstra
2018-12-18T11:29:46Z

On Tue, Dec 18, 2018 at 08:17:01PM +0900, Sergey Senozhatsky wrote:
> On (12/18/18 11:48), Peter Zijlstra wrote:
> > > I know that there is a "kernel.printk_devkmsg" interface; do we
> > > expect every systemd-enabled distro to find that out and to tweak
> > > kernel.printk_devkmsg or shall we change the default devkmsg
> > > ratelimit instead?
> >
> > How about we complain to systemd instead?
>
> We certainly can. As far as I understand, they log shutdown events
> (including errors and warnings): what they kill, what they stop,
> what they umount, etc. The more partitions, services are running
> (I guess), the more things they need to umount, kill, stop; hence,
> the more messages. I kinda can imagine what they will answer ;)
>
> The below (and a bunch of other) messages are getting ratelimited.
> I'm not sure what will happen should any of those steps fail and
> print warning-s. My guess would be that we probably can ratelimit
> those warnings:

Why are they writing it to /dev/kmsg though? Shouldn't they be writing
this to syslog directly?