[PATCH 0/2] printk.kmsg: Ratelimit it by default
From: Borislav Petkov
Date: Tue Jun 14 2016 - 06:12:39 EST
From: Borislav Petkov <bp@xxxxxxx>
Ok, so how about these two?
Rostedt is busy so I took Linus' old patch and Steven's last v2 and
split and extended them with the comments people had on the last thread:
https://lkml.kernel.org/r/20160425145606.598329f2@xxxxxxxxxxxxxxxxxx
I hope, at least.
So it is ratelimiting by default, with "on" and "off" cmdline options. I
called the option somewhat a bit shorter too: "printk.kmsg"
The current use cases of this and of which I'm aware are:
* debug the kernel and thus shut up all interfering input from
userspace, i.e. boot with "printk.kmsg=off"
* debug userspace (and by that I mean systemd) by booting with
"printk.kmsg=on" so that the ratelimiting is disabled and the kernel log
gets all the spew.
Thoughts?
Thanks.
Borislav Petkov (2):
ratelimit: Extend to print suppressed messages on release
printk: Add kernel parameter to control writes to /dev/kmsg
Documentation/kernel-parameters.txt | 6 ++++
include/linux/ratelimit.h | 36 +++++++++++++++++++----
kernel/printk/printk.c | 57 +++++++++++++++++++++++++++++++------
lib/ratelimit.c | 6 ++--
4 files changed, 90 insertions(+), 15 deletions(-)
--
2.7.3