linux-kernel - Re: [PATCH] pm: Add runtime PM statistics to sysfs

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Date:	Fri, 9 Jul 2010 15:04:59 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pm: Add runtime PM statistics to sysfs

2010/7/9 Arjan van de Ven <arjan@...radead.org>:
> From: Arjan van de Ven <arjan@...ux.intel.com>
> 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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