This patch add basic tracing of the devfreq workqueue and delayed work. It aims to capture changes of the polling intervals and device state.
Signed-off-by: Lukasz Luba <[email protected]> --- drivers/devfreq/devfreq.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 29e99ce..c1d0d8c 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -29,6 +29,9 @@ #include <linux/of.h> #include "governor.h" +#define CREATE_TRACE_POINTS +#include <trace/events/devfreq.h> + /* The ~30% load threshold used for load calculation (due to fixed point * arithmetic) */ #define LOAD_THRESHOLD_IN_DEVICE_USAGE (300) @@ -418,6 +421,7 @@ static void devfreq_monitor(struct work_struct *work) struct devfreq *devfreq = container_of(work, struct devfreq, work.work); unsigned int polling_ms; + const char *df_name = dev_name(&devfreq->dev); mutex_lock(&devfreq->lock); polling_ms = devfreq_get_polling_delay(devfreq); @@ -429,6 +433,10 @@ static void devfreq_monitor(struct work_struct *work) schedule_delayed_work(&devfreq->work, msecs_to_jiffies(polling_ms)); mutex_unlock(&devfreq->lock); + + trace_devfreq_monitor(df_name, devfreq->previous_freq, polling_ms, + devfreq->last_status.busy_time, + devfreq->last_status.total_time); } /** -- 2.7.4
