From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthew Locke <matt@nomadgs.com>
Subject: Re: PowerOP, Intro 0/3
Date: Mon, 28 Aug 2006 00:37:44 -0700
Message-ID: <1d71fc171bd3635111b4da9024db747f@nomadgs.com>
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To: Pavel Machek <pavel@ucw.cz>
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On Aug 26, 2006, at 1:38 PM, Pavel Machek wrote:

> Hi!
>
>>>> PowerOP Core upper layer interface provides the
>>>> following capabilities:
>>>> - to register an operating point by passing an
>>>> idenificator of the point
>>>> represened by a string and arbitrary substet of power
>>>> paremeters available on a
>>>> certain platform by a string (parameter name) and
>>>> value pairs.
>>>> - to unregister operating point by name
>>>> - to set operating point by name
>>>> - to get values of arbitrary subset of platform power
>>>> parameters associated
>>>> this  a point (point is passed by name or NULL to get
>>>> current parameter values
>>>> from hw)
>>>
>>> I do not think this can work in notebook world, sorry.
>>> You'll just get
>>> way too many operating points.
>> The only feature for notebook world currently presented
>> in the kernel is CPUFreq. CPUFreq PowerOP integration
>
> Actually no. In the notebook world, we do cpufreq, selective powerdown
> of devices (/sys/**/power/state), and suspend-to-ram/disk (not sure if
> it applies to you, but at least some powerop versions wanted to
> replace that).


The main point is that you won't get too many operating points.  You =

will get the number of operating points the x86 port of PowerOP chooses =

to have.  In the cpufreq/PowerOP integration patches you get the same =

number of operating points you have today in cpufreq.   We query ACPI =

for the list or use the hardcoded table.  Also, if we provide a =

userspace API for creating operating points,  distro's can create =

additional operating points that make sense for some specific use cases =

they would like to optimize around.


Matt