linux-kernel - Re: [PATCH] hwmon: Add power meters to Documentation/hwmon/sysfs-interface

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Date:	Wed, 29 Aug 2007 11:10:52 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	"Mark M. Hoffman" <mhoffman@...htlink.com>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [PATCH] hwmon: Add power meters to
 Documentation/hwmon/sysfs-interface

Hi Darrick,

On Tue, 28 Aug 2007 09:44:40 -0700, Darrick J. Wong wrote:
> Update the hwmon sysfs interface documentation to include a specification
> for power meters.
> 
> Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
> ---
> 
>  Documentation/hwmon/sysfs-interface |   15 +++++++++++++++
>  1 files changed, 15 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
> index b3a9e1b..da546ce 100644
> --- a/Documentation/hwmon/sysfs-interface
> +++ b/Documentation/hwmon/sysfs-interface
> @@ -304,6 +304,21 @@ curr[1-*]_input	Current input value
>  		Unit: milliampere
>  		RO
>  
> +*********
> +* Power *
> +*********
> +
> +power[1-*]_input	Current power use
> +			Unit: milliWatt
> +			RO
> +
> +power[1-*]_max_input	Historical maximum power use
> +			Unit: milliWatt
> +			RO
> +
> +power[1-*]_min_input	Historical minimum power use
> +			Unit: milliWatt
> +			RO
>  

I'm not sure if we want these "historical" files. We don't have them for
the other input types, and I believe that it's not the driver's job to
compute and export these values. If anyone cares about the history of
sensed values, that's something for a user-space application to
implement. This will also be much more flexible in user-space, as it
becomes possible to decide the exact time range to consider, to
remember at which time the peak occurred, etc.

-- 
Jean Delvare
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