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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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