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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 | 23 +++++++++++++++++++++++
1 file changed, 23 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
@@ -383,6 +383,19 @@ 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, delta;
+ unsigned long long usecs;
+
+ calltime = ktime_get();
+ delta = ktime_sub(calltime, starttime);
+ usecs = (unsigned long long)ktime_to_ns(delta) >> 10;
+ pr_info("PM: %s%s%s of devices complete after %Lu.%03Lu msecs\n",
+ info ?: "", info ? " " : "", pm_verb(state.event),
+ usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
+}
+
/*------------------------- Resume routines -------------------------*/

/**
@@ -419,6 +432,7 @@ 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;
@@ -432,6 +446,7 @@ 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);
@@ -524,6 +539,7 @@ 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);
@@ -554,6 +570,7 @@ static void dpm_resume(pm_message_t stat
list_splice(&list, &dpm_list);
mutex_unlock(&dpm_list_mtx);
async_synchronize_full();
+ dpm_show_time(starttime, state, NULL);
}

/**
@@ -686,6 +703,7 @@ 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();
@@ -701,6 +719,8 @@ 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);
@@ -800,6 +820,7 @@ 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);
@@ -831,6 +852,8 @@ static int dpm_suspend(pm_message_t stat
async_synchronize_full();
if (!error)
error = async_error;
+ if (!error)
+ dpm_show_time(starttime, state, NULL);
return error;
}



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