Re: [Linux-pm-devel] Re: IBM/MontaVista Dynamic Power Management Project

Hollis Blanchard
2002-12-03T20:20:53Z

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On Tue, 2002-12-03 at 14:00, Dominik Brodowski wrote:
> On Tue, Dec 03, 2002 at 12:27:03PM -0600, Hollis Blanchard wrote:
> > On Tue, 2002-12-03 at 11:57, Arjan van de Ven wrote:
> > >
> > > any idea if/how this will fit into the existing cross platform cpufreq
> > > framework ?
> >
> > It subsumes it, similar to Dominik's ideas in "[RFC] Dynamic Frequency
> > and Voltage Scaling Infrastructure" (on the cpufreq list). The idea is
> > that you want scaling events to be generated by the kernel rather than
> > only scaling on userland input. The paper (and Dominik's mail) give you
> > some ideas of when and why...
>
> So, will it basically be a "policy governor" as described in my "[RFC]" mail?
> Or does it need other enhancements in the cpufreq core?
>
> BTW, have you noticed the premilinary patch I which implements most of the
> DVS infrastructure mentioned in my mail to the cpufreq list yesterday?

Honestly I haven't had time to read it over and compare and contrast
with the IBM paper. From the sound of things though, I suspect both your
patch and the IBM code implement the same thing: an infrastructure
allowing "governors" to control dynamic scaling. The 405LP code also
includes such a governor of course. The ideas may be almost identical;
I'm not sure anyone's compared at this point. Do you have the time? ;)

-Hollis
--
PowerPC Linux
IBM Linux Technology Center

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