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The system tick of a kernel is used to

  • A.refresh the watchdog timer
  • B.count the number of context switches the kernel has performed
  • C.measure timeouts and delays and to drive time slicing
  • D.generate the clock for the processor core

Answer: C

Correct answer: measure timeouts and delays and to drive time slicing

The tick is a periodic interrupt from which the kernel counts time, so every delay and timeout is expressed in ticks and expires on one. That is why the tick period sets the resolution of all timing the kernel provides.

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