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Commit ecf762b2 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM: Measure device suspend and resume times 



Measure and print the time of suspending and resuming all devices.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 875ab0b7

drivers/base/power/main.c

+27 −0
Original line number Diff line number Diff line
@@ -372,6 +372,23 @@ static void pm_dev_err(struct device *dev, pm_message_t state, char *info, 
		kobject_name(&dev->kobj), pm_verb(state.event), info, error);

}



static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info)

{

	ktime_t calltime;

	s64 usecs64;

	int usecs;



	calltime = ktime_get();

	usecs64 = ktime_to_ns(ktime_sub(calltime, starttime));

	do_div(usecs64, NSEC_PER_USEC);

	usecs = usecs64;

	if (usecs == 0)

		usecs = 1;

	pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n",

		info ?: "", info ? " " : "", pm_verb(state.event),

		usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);

}



/*------------------------- Resume routines -------------------------*/



/**
@@ -408,6 +425,7 @@ static int device_resume_noirq(struct device *dev, pm_message_t state) 
void dpm_resume_noirq(pm_message_t state)

{

	struct device *dev;

	ktime_t starttime = ktime_get();



	mutex_lock(&dpm_list_mtx);

	transition_started = false;
@@ -421,6 +439,7 @@ void dpm_resume_noirq(pm_message_t state) 
				pm_dev_err(dev, state, " early", error);

		}

	mutex_unlock(&dpm_list_mtx);

	dpm_show_time(starttime, state, "early");

	resume_device_irqs();

}

EXPORT_SYMBOL_GPL(dpm_resume_noirq);
@@ -506,6 +525,7 @@ static int device_resume(struct device *dev, pm_message_t state) 
static void dpm_resume(pm_message_t state)

{

	struct list_head list;

	ktime_t starttime = ktime_get();



	INIT_LIST_HEAD(&list);

	mutex_lock(&dpm_list_mtx);
@@ -534,6 +554,7 @@ static void dpm_resume(pm_message_t state) 
	}

	list_splice(&list, &dpm_list);

	mutex_unlock(&dpm_list_mtx);

	dpm_show_time(starttime, state, NULL);

}



/**
@@ -666,6 +687,7 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state) 
int dpm_suspend_noirq(pm_message_t state)

{

	struct device *dev;

	ktime_t starttime = ktime_get();

	int error = 0;



	suspend_device_irqs();
@@ -681,6 +703,8 @@ int dpm_suspend_noirq(pm_message_t state) 
	mutex_unlock(&dpm_list_mtx);

	if (error)

		dpm_resume_noirq(resume_event(state));

	else

		dpm_show_time(starttime, state, "late");

	return error;

}

EXPORT_SYMBOL_GPL(dpm_suspend_noirq);
@@ -760,6 +784,7 @@ static int device_suspend(struct device *dev, pm_message_t state) 
static int dpm_suspend(pm_message_t state)

{

	struct list_head list;

	ktime_t starttime = ktime_get();

	int error = 0;



	INIT_LIST_HEAD(&list);
@@ -785,6 +810,8 @@ static int dpm_suspend(pm_message_t state) 
	}

	list_splice(&list, dpm_list.prev);

	mutex_unlock(&dpm_list_mtx);

	if (!error)

		dpm_show_time(starttime, state, NULL);

	return error;

}