Supporting multiple CPU idle levels in kernel
  
  				cpuidle
  
  General Information:
  
  Various CPUs today support multiple idle levels that are differentiated
  by varying exit latencies and power consumption during idle.
  cpuidle is a generic in-kernel infrastructure that separates
  idle policy (governor) from idle mechanism (driver) and provides a
  standardized infrastructure to support independent development of
  governors and drivers.
  
  cpuidle resides under drivers/cpuidle.
  
  Boot options:
  "cpuidle_sysfs_switch"
  enables current_governor interface in /sys/devices/system/cpu/cpuidle/,
  which can be used to switch governors at run time. This boot option
  is meant for developer testing only. In normal usage, kernel picks the
  best governor based on governor ratings.
  SEE ALSO: sysfs.txt in this directory.