Regarding the CPUFreq interface in HAL

[Richard Hughes]

On Thu, 2007-07-05 at 17:44 -0700, Anup Pemmaiah wrote:
> Hi,
> 
> I'm working with a group inside of Sun Microsystems to port Gnome Power
> Manager to Solaris.

Cool! Yell if you guys need a hand getting changes upstream :-)

> This effort will require me to implement one of the
> HAL interfaces,"org.freedesktop.Hal.Device.CPUFreq", on Solaris. As I've
> been considering how we might use this interface with our governors, 
> I've begun to think that the interface, as it is currently defined, is 
> not very flexible in its ability to handle multiple properties.
> 
> For example, while considering one of our governors (one that is similar 
> to the Linux OnDemand governor), it occurred to me that we might want 
> the ability to configure properties related to threshold and sampling 
> rates (and possibly others). While the "SetCPUFreqPerformance" method 
> does provide a mechanism for defining at least one of these properties, 
> it doesn't seem like a good solution for multiple properties.

Do you _need_ to be able to change all the parameters from the session -
the idea of SetCPUFreqPerformance was to set a general "setting" rather
than be able to tweak every single knob.

> I'm curious whether or not there are any plans to extend this interface 
> in the future to better support more properties. I'd be happy to discuss 
> this further if you are interested.

Sure, suggest away.

Richard.