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Date: Tue, 14 Jun 2016 12:12:06 +0200 From: Borislav Petkov <bp@...en8.de> To: Linus Torvalds <torvalds@...ux-foundation.org>, Steven Rostedt <rostedt@...dmis.org> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Andrew Morton <akpm@...ux-foundation.org>, Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, LKML <linux-kernel@...r.kernel.org> Subject: [PATCH 0/2] printk.kmsg: Ratelimit it by default From: Borislav Petkov <bp@...e.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
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