linux-kernel - Re: [PATCH] tracing: add trace console

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Message-ID: <1321455031.27735.4.camel@twins>
Date:	Wed, 16 Nov 2011 15:50:31 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Johannes Berg <johannes@...solutions.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] tracing: add trace console

On Wed, 2011-11-16 at 09:48 -0500, Steven Rostedt wrote:

> > It'll always be registered and you have no way to turn it off then, so
> > you can't trace without getting every printk. I didn't want to add extra
> > API to toggle it, but building it in might be a bit odd that way.
> 
> Actually, that's not quite true. You could just do:
> 
> echo 0 > /debug/tracing/options/trace_printk

well, that'll kill all trace_printk()s, which isn't what johill meant.

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