linux-kernel - Re: [PATCH] trace: power: add trace_clock_set

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Date:	Wed, 09 May 2012 19:50:54 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Colin Cross <ccross@...roid.com>
Cc:	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Jesper Juhl <jj@...osbits.net>,
	Jiri Kosina <jkosina@...e.cz>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>
Subject: Re: [PATCH] trace: power: add trace_clock_set_parent

On Wed, 2012-05-09 at 16:21 -0700, Colin Cross wrote:
> Adds a new trace event to be called from clk_set_parent.  Some
> cpufreq drivers, including Tegra, reparent the cpu clock to a
> slower clock while the main pll is relocking, tracing
> clk_set_parent allows traces to show how for long the cpu is
> running slower.
> 
> Uses a separate TRACE_EVENT instead of the clock event class to
> allow the event to contain string names for the child and the
> parent.
> 
> Signed-off-by: Colin Cross <ccross@...roid.com>
> ---
>  include/trace/events/power.h |   19 +++++++++++++++++++
>  1 files changed, 19 insertions(+), 0 deletions(-)
> 
> diff --git a/include/trace/events/power.h b/include/trace/events/power.h
> index cae9a94..2b81df6 100644
> --- a/include/trace/events/power.h
> +++ b/include/trace/events/power.h
> @@ -204,6 +204,25 @@ enum {
>  	TP_ARGS(name, state, cpu_id)
>  );
>  
> +TRACE_EVENT(clock_set_parent,
> +
> +	TP_PROTO(const char *name, const char *parent_name),
> +
> +	TP_ARGS(name, parent_name),
> +
> +	TP_STRUCT__entry(
> +		__string(       name,           name            )
> +		__string(       parent_name,    parent_name     )
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(name, name);
> +		__assign_str(name, parent_name);

Don't you mean: __assign_str(parent_name, parent_name); ?

-- Steve

> +	),
> +
> +	TP_printk("%s parent=%s", __get_str(name), __get_str(parent_name))
> +);
> +
>  /*
>   * The power domain events are used for power domains transitions
>   */


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