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PM / devfreq: Add tracepoint for frequency changes

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

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
[cw00.choi: Move print position of tracepoint and add more information]
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Matthias Kaehlcke 2020-10-07 22:03:59 +09:00 committed by Chanwoo Choi
parent b4365423bb
commit cab477d0d4
2 changed files with 36 additions and 0 deletions
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8
drivers/devfreq/devfreq.c
View File

@ -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);

28
include/trace/events/devfreq.h
View File

@ -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),