support for software direct frequency throttling?

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Is there an easy way to dynamically limit the maximum or minimum
frequencies available to a governor? I'm trying to support frequency
throttling in response to a thermal event (or theoretically to allow a
BMC to set a minimum frequency regardless of current load).

I looked into doing this last year and it required some QoS patches that
I don't think ever made it into the kernel.

Is there a straightforward way to do this right now? If not, is anyone
working on implementing this? If not, any preferences from the
maintainers on how I should implement?

Thanks,
Mark Langsdorf
Calxeda, Inc.
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