linux-kernel - Re: [PATCH -v4 2/2] printk: Add kernel parameter to control writes to /dev/kmsg

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Message-ID: <20160715062109.GA4515@dhcp-128-65.nay.redhat.com>
Date:	Fri, 15 Jul 2016 14:21:09 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Franck Bui <fbui@...e.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH -v4 2/2] printk: Add kernel parameter to control writes
 to /dev/kmsg

On 07/08/16 at 11:18am, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
> 
> Add a "printk.devkmsg" kernel command line parameter which controls how
> userspace writes into /dev/kmsg. It has three options:
> 
> * ratelimit - ratelimit logging from userspace.
> * on  - unlimited logging from userspace
> * off - logging from userspace gets ignored
> 
> The default setting is to ratelimit the messages written to it.

Sorry for jumping in late. But I just see this today and I really like the
idea to add a switch to turn off the kmsg writing from userspace because
I suffer from it also.

I may missed the background, what is the reason for "ratelimit"?  It sounds
a little odd. I think use default "on" should be safe to keep same behavior
as before.

Thanks
Dave