[Experimental] Cpufreq hack for embedded systems

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From: Tero Kristo <tero.kristo@xxxxxxxxx>

Hi,

In embedded devices we are trying to conserve power by running the device on
a very low frequency, but which in turn can have a nasty side effect that
user responsiveness can be really slow... until ondemand governor notices
that the used frequency is not enough. This patch makes sure that whenever
user interaction occurs, frequency is pushed immediately to maximum. Ondemand
governor can then scale it down to low levels when the high performance is
not needed anymore.

I would not recommend pushing this patch as such into mainline, but this
can be useful for some people anyway. It might be nice to have this feature
behind some sort of kernel config option maybe.

Any comments?

-Tero


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