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

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Date:	Wed, 16 Nov 2011 15:25:37 +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 09:15 -0500, Steven Rostedt wrote:
> I'm good with this. Anyone have any issues with it?
> 
> -- Steve
> 
> > 
> > Signed-off-by: Johannes Berg <johannes.berg@...el.com>
> > ---
> >  kernel/trace/Kconfig         |   13 ++++++++++
> >  kernel/trace/Makefile        |    2 +
> >  kernel/trace/trace-console.c |   55 +++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 70 insertions(+)
> > 
> > --- a/kernel/trace/Kconfig    2011-11-16 11:11:27.000000000 +0100
> > +++ b/kernel/trace/Kconfig    2011-11-16 11:11:35.000000000 +0100
> > @@ -368,6 +368,19 @@ config BLK_DEV_IO_TRACE
> >  
> >         If unsure, say N.
> >  
> > +config TRACE_CONSOLE
> > +     tristate "Support for a tracing console"
> > +     help
> > +       Say M (or Y if you must, but this is not recommended) 

Why not?

> to be able
> > +       to get a tracing console that puts every kernel message into the
> > +       tracing infrastructure using trace_printk(). This is useful to
> > +       correlate (existing) printk debugging with tracing. When using it
> > +       remember to set the console level, e.g. with "dmesg -n8". 
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