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    SubjectRe: Power Management framework proposal
    On Sun, 2007-07-22 at 10:26 -0700, Arjan van de Ven wrote:
    > On Sat, 2007-07-21 at 23:49 -0700, 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.

    I think we need a set of constraints that trickle down the power tree
    and limit what a given driver can do locally.


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