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Subject: Re: [PATCH] tracing: add trace console
From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Johannes Berg <johannes@sipsolutions.net>,
        LKML <linux-kernel@vger.kernel.org>,
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        Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>
Date: Wed, 16 Nov 2011 15:50:31 +0100
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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.