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SubjectRe: [linux-pm] RFC: /sys/power/policy_preference

> On Jun 16, 2010, at 4:05 PM, Len Brown <> wrote:
> > Create /sys/power/policy_preference, giving user-space
> > the ability to express its preference for kernel based
> > power vs. performance decisions in a single place.
> >
> > This gives kernel sub-systems and drivers a central place
> > to discover this system-wide policy preference.
> > It also allows user-space to not have to be updated
> > every time a sub-system or driver adds a new power/perf knob.
> I would prefer documenting all the current knobs and adding them to pm-utils
> so that pm-powersave knows about and can manage them. Once that is done,
> creating arbitrary powersave levels should be fairly simple.

The idea here is to not require user-space to need updating
whenever a future knob is invented. We can do a great job
at documenting the past, but a poor job of documenting the future:-)

Len Brown, Intel Open Source Technolgy Center

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