Commit cab477d0 authored by Matthias Kaehlcke's avatar Matthias Kaehlcke Committed by Chanwoo Choi
Browse files

PM / devfreq: Add tracepoint for frequency changes 



Add a tracepoint for frequency changes of devfreq devices and
use it.

Signed-off-by: default avatarMatthias Kaehlcke <mka@chromium.org>
[cw00.choi: Move print position of tracepoint and add more information]
Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
parent b4365423

drivers/devfreq/devfreq.c

+8 −0
Original line number Diff line number Diff line
@@ -367,6 +367,14 @@ static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq, 
		return err;

	}



	/*

	 * Print devfreq_frequency trace information between DEVFREQ_PRECHANGE

	 * and DEVFREQ_POSTCHANGE because for showing the correct frequency

	 * change order of between devfreq device and passive devfreq device.

	 */

	if (trace_devfreq_frequency_enabled() && new_freq != cur_freq)

		trace_devfreq_frequency(devfreq, new_freq, cur_freq);



	freqs.new = new_freq;

	devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);

include/trace/events/devfreq.h

+28 −0
Original line number Diff line number Diff line
@@ -8,6 +8,34 @@ 
#include <linux/devfreq.h>

#include <linux/tracepoint.h>



TRACE_EVENT(devfreq_frequency,

	TP_PROTO(struct devfreq *devfreq, unsigned long freq,

		 unsigned long prev_freq),



	TP_ARGS(devfreq, freq, prev_freq),



	TP_STRUCT__entry(

		__string(dev_name, dev_name(&devfreq->dev))

		__field(unsigned long, freq)

		__field(unsigned long, prev_freq)

		__field(unsigned long, busy_time)

		__field(unsigned long, total_time)

	),



	TP_fast_assign(

		__assign_str(dev_name, dev_name(&devfreq->dev));

		__entry->freq = freq;

		__entry->prev_freq = prev_freq;

		__entry->busy_time = devfreq->last_status.busy_time;

		__entry->total_time = devfreq->last_status.total_time;

	),



	TP_printk("dev_name=%-30s freq=%-12lu prev_freq=%-12lu load=%-2lu",

		__get_str(dev_name), __entry->freq, __entry->prev_freq,

		__entry->total_time == 0 ? 0 :

			(100 * __entry->busy_time) / __entry->total_time)

);



TRACE_EVENT(devfreq_monitor,

	TP_PROTO(struct devfreq *devfreq),

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