linux-kernel - Re: [linux-pm] [RFC PATCH] thermal: Add support to report cooling statistics achieved by cooling devices

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Message-ID: <20120206170348.GA19749@kroah.com>
Date:	Mon, 6 Feb 2012 09:03:49 -0800
From:	Greg KH <greg@...ah.com>
To:	Amit Daniel Kachhap <amit.kachhap@...aro.org>
Cc:	Pavel Machek <pavel@....cz>, linux-pm@...ts.linux-foundation.org,
	linaro-dev@...ts.linaro.org, patches@...aro.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	rob.lee@...aro.org
Subject: Re: [linux-pm] [RFC PATCH] thermal: Add support to report cooling
 statistics achieved by cooling devices

On Mon, Feb 06, 2012 at 05:56:58PM +0100, Pavel Machek wrote:
> Hi!
> 
> > Add a sysfs node code to report effective cooling of all cooling devices
> > attached to each trip points of a thermal zone. The cooling data reported
> > will be absolute if the higher temperature trip points are arranged first
> > otherwise the cooling stats is the cumulative effect of the earlier
> > invoked cooling handlers.
> > 
> > The basic assumption is that cooling devices will bring down the temperature
> > in a symmetric manner and those statistics can be stored back and used for
> > further tuning of the system.
> 
> /sys fs should be one-value-per-file, talk to gregkh.

That's correct.

Why not use debugfs for this instead?

thanks,

greg k-h
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