linux-kernel - Re: [PATCH -v3 1/2] ratelimit: Extend to print suppressed messages on release

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Date:	Tue, 5 Jul 2016 20:45:17 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.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>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH -v3 1/2] ratelimit: Extend to print suppressed messages
 on release

On Tue, Jul 05, 2016 at 02:26:48PM -0400, Steven Rostedt wrote:
> > +	if (rs->missed)
> > +		printk(KERN_WARNING "%s: %d output lines suppressed due to ratelimiting\n",
> > +		       current->comm, rs->missed);
> 
> Is the comm important?

Yes, we wanna dump the task name which called devkmsg_release().

> Maybe add the function that called it?
> 
>     "%pS", _THIS_IP_
> 
> Perhaps add __always_inline, as _THIS_IP_ will point into the function
> that calls this?

That would inadvertently be devkmsg_release() in this use case. But
we want to dump the task name which opened and spat so much crap into
/dev/kmsg so as to cause the ratelimiting to hit.

-- 
Regards/Gruss,
    Boris.

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