本文介绍了CPUIdle框架如何帮助CPU进入不同的低功耗模式。通过idle线程调用特定函数实现，涉及cpuidle_idle_call、cpuidle_select等关键API，并依据CPU负载、I/O等待时间及退出延迟等因素选择合适的低功耗模式。
1. CPUidle framework provides the capability to sleep to the different low power modes.
2. idle thread will call cpu_startup_entry()->cpu_idle_loop()->cpuidle_idle_call() to use cpuidle framework.
3. in cpuidle_idle_call(), cpuidle_select() ,cpuidle_enter() and cpuidle_reflect() are called. They are the governor API for the cpuidle framework.
4. governor 'menu' will calculate which low power mode to enter. The calculation is based on cpu loading, iowaiters and exit latency.
5. low power modes are defined in cpuidle_driver. cpuidle_register() registers cpuidle_driver.
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