Re: Power Management framework proposal

[Arjan van de Ven]

On Sat, 2007-07-21 at 23:49 -0700, david@xxxxxxx wrote:

> this approach would allow the transition of ALL drivers to the new mode of 
> operation in one fell swoop, and then adding additional power management 
> features is just adding to the existing list rather then implementing new 
> functions.


I have a concern with this approach though. It seems to assume that
there is one global thing somewhere that sets the system state; in my
experience that is the wrong approach; in fact there is a very definite
evidence that there are many decisions on power that are to be made
local at a high frequency. An example of this is the processor speed;
the ondemand governer does exactly this for the cpus that can switch
speeds fast; it's just impossible to beat such a local, fast decision
with anything on a global scale.

On the other hand, some things (the high level goals and constraints)
are obviously global.

However, your design seems to want to put the low level settings in a
global thing, and that is just a mistake.


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