On Sun, 2007-07-22 at 10:26 -0700, Arjan van de Ven wrote: > 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. I think we need a set of constraints that trickle down the power tree and limit what a given driver can do locally. Ben. _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
