2010/7/9 Arjan van de Ven <arjan@xxxxxxxxxxxxx>:
> From: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
> diff --git a/include/linux/pm.h b/include/linux/pm.h
> index 8e258c7..dca597f 100644
> --- a/include/linux/pm.h
> +++ b/include/linux/pm.h
> @@ -476,9 +476,15 @@ struct dev_pm_info {
> enum rpm_request request;
> enum rpm_status runtime_status;
> int runtime_error;
> + unsigned long active_jiffies;
> + unsigned long suspended_jiffies;
> + unsigned long accounting_timestamp;
> #endif
> };
USB subsystem has implemented the function already, and only two variables
are enough to do the statistics. Suggest you to make a reference to usb
implementation, maybe sizeof(unsigned long) bytes per device can be saved.
--
Lei Ming
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