linux-kernel - Re: [PATCH] printk: add console output tracing

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Message-ID: <1321541877.3997.31.camel@jlt3.sipsolutions.net>
Date:	Thu, 17 Nov 2011 15:57:57 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] printk: add console output tracing

On Thu, 2011-11-17 at 15:55 +0100, Frederic Weisbecker wrote:

> > +++ b/kernel/trace/printk-trace.c	2011-11-16 21:22:20.000000000 +0100
> > @@ -0,0 +1,14 @@
> > +/*
> > + * printk trace points
> > + *
> > + * Copyright (C) 2011 Johannes Berg <johannes.berg@...el.com>
> > + */
> > +
> > +#include <linux/string.h>
> > +#include <linux/types.h>
> > +#include <linux/workqueue.h>
> > +#include <linux/sched.h>
> > +#include <linux/module.h>
> > +
> > +#define CREATE_TRACE_POINTS
> > +#include <trace/events/printk.h>
> 
> Why not defining the tracepoint in kernel/printk.c ?

Is that even possible? Do you then have to do something like

#include <.../printk.h>
#define CREATE_TRACE_POINTS
#include <.../printk.h>

or how else? In any case it seemed more common to not do that.

johannes

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