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PM: Measure device suspend and resume times 

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

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki 2009-12-18 01:57:47 +01:00
parent 875ab0b74e
commit ecf762b258
1 changed files with 27 additions and 0 deletions
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27
drivers/base/power/main.c
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@ -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;
}