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Subject[PATCH 2/5] PM: Measure device suspend and resume times
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

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

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
drivers/base/power/main.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
Index: linux-2.6/drivers/base/power/main.c
===================================================================
--- linux-2.6.orig/drivers/base/power/main.c
+++ linux-2.6/drivers/base/power/main.c
@@ -372,6 +372,23 @@ static void pm_dev_err(struct device *de
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 de
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 *
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 stat
}
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 d
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
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 stat
}
list_splice(&list, dpm_list.prev);
mutex_unlock(&dpm_list_mtx);
+ if (!error)
+ dpm_show_time(starttime, state, NULL);
return error;
}



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