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Tickless idle operation means the kernel

  • A.runs the idle task at the highest priority available in the whole system
  • B.stops the periodic tick while nothing is due and sleeps longer
  • C.abandons all notion of time while idle
  • D.raises the tick rate whenever the system is idle

Answer: B

Waking a hundred or a thousand times a second to discover there is nothing to do is ruinous for a battery, so the kernel programmes a wake-up for the next event that is actually due and sleeps until then. It is the single most valuable power feature a kernel offers.

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