Re: [linux-pm] PowerOP 1/3: PowerOP core
From: Daniel Petrini
Date: Wed Aug 10 2005 - 08:59:36 EST
> If these general ideas of arbitrary platform power parameters and
> operating points are deemed worthy of continued consideration, I'll
> propose what I view is the next step: interfaces to create and activate
> operating points from userspace.
> At that point it should be possible to write power policy management
> applications for systems that can benefit from this generalized notion
> of operating points: create the operating points that match the system
> usage models (in the case of many embedded systems, the system is some
> mode with different power/performance characteristics such as audio
> playback vs. mobile phone call in progress) and power needs (e.g., low
> battery strength vs. high strength) and activate operating points based
> on events received (new app running, low battery warning, etc.).
> Any opinions on all that? Thanks,
I'd like to have an idea of how the powerop would evolve to address:
a) exporting all operating points to sysfs - that would be useful for
a policy manager in user space, or the user policy will already be
aware of the ops?
b) Constraints: if I would like to change to a op and such a
transition is not allowed in hardware, what part of the software will
test it? The set/get powerop functions, the higher layers or even some
lower layer (don't know if expected) ?
10LE - Linux
INdT - Manaus - Brazil
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