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

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Message-ID: <20111117145502.GA18437@somewhere>
Date:	Thu, 17 Nov 2011 15:55:07 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
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 Wed, Nov 16, 2011 at 10:25:19PM +0100, Johannes Berg wrote:
> From: Johannes Berg <johannes.berg@...el.com>
> 
> Add a printk.console trace point to record any printk
> messages into the trace, regardless of the current
> console loglevel. This can help correlate (existing)
> printk debugging with other tracing.
> 
> Signed-off-by: Johannes Berg <johannes.berg@...el.com>
> ---
>  include/trace/events/printk.h |   44 ++++++++++++++++++++++++++++++++++++++++++
>  kernel/printk.c               |    3 ++
>  kernel/trace/Makefile         |    1 
>  kernel/trace/printk-trace.c   |   14 +++++++++++++
>  4 files changed, 62 insertions(+)
<snip> 
> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ 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 ?
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