Linux Power Management for x86 CPU (1)----c-state__linux

Linux Power Management for x86 CPU (1)----c-state
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Modern CPUs are and more powerful. When there are no job to do, it
Enters into the idle state. During its Ilde period, we certainly can cut
Off their power and have it enter into Low-power state only if we know
When there are new assignment and we can re-activate CPU and have it do
Its jobs again. The process is like this:

No job cut out power
CPU in Active----------> CPUs in Idle--------------> low-power State
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