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From: Borislav Petkov <bp@alien8.de>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	Steven Rostedt <rostedt@goodmis.org>
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Ingo Molnar" <mingo@kernel.org>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 0/2] printk.kmsg: Ratelimit it by default
Date: Tue, 14 Jun 2016 12:12:06 +0200	[thread overview]
Message-ID: <1465899128-4522-1-git-send-email-bp@alien8.de> (raw)

From: Borislav Petkov <bp@suse.de>

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@gandalf.local.home

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

             reply	other threads:[~2016-06-14 10:12 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-14 10:12 Borislav Petkov [this message]
2016-06-14 10:12 ` [PATCH 1/2] ratelimit: Extend to print suppressed messages on release Borislav Petkov
2016-06-14 10:12 ` [PATCH 2/2] printk: Add kernel parameter to control writes to /dev/kmsg Borislav Petkov
2016-06-14 10:21   ` Ingo Molnar
2016-06-14 18:14     ` Steven Rostedt
2016-06-14 18:30       ` Borislav Petkov
2016-06-16  1:40       ` Linus Torvalds
2016-06-16  9:51         ` Borislav Petkov
2016-06-16  1:41 ` [PATCH 0/2] printk.kmsg: Ratelimit it by default Linus Torvalds

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