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Context switch overhead is accounted for in a schedulability analysis by

  • A.subtracting it from the utilisation bound
  • B.adding it once to the total utilisation of the set
  • C.ignoring it
  • D.adding it to each task's execution time

Answer: D

Two switches per release, one in and one out, are charged to the task being released, which keeps the analysis in its usual form. On a set with short periods and a slow switch the correction can be several per cent of the processor.

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