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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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