process priority

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Sorry if this has been discussed before; I can't seem to find an archive for this list.

Do any of the available speed governors take process priority into account? E.g., I'd like to run Folding@Home in the background on my machine. I want it to run at low priority, and get 100% of the CPU when the machine is otherwise idle. But, I don't want the CPU's speed to increase because of this one busy process. On the other hand, if I'm doing any other CPU-intensive work, I want the CPU speed to increase as usual.

I.e., I'd like to be able to run these CPU-intensive background jobs but not at max speed/max power consumption.
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