[$] Scheduler utilization clamping

Once upon a time, the only way to control how the kernel's CPU schedulertreated any given process was to adjust that process's priority. Priorities are nolonger enough to fully control CPU scheduling, though, especially whenpower-management concerns are taken into account. The utilizationclamping patch set from Patrick Bellasi is the latest in a series ofattempts to allow user space to tell the scheduler more about any specificprocess's needs.