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A task set is schedulable under rate monotonic. Doubling the period of the lowest priority task leaves it

  • A.certainly unschedulable, the deadline having moved
  • B.unaffected, the lowest priority task not entering the analysis
  • C.still schedulable, the utilisation having fallen
  • D.possibly unschedulable, the priority order having changed

Answer: C

The task remains the lowest priority since its period is still the longest, and its own demand has halved, so nothing above it is affected and it has more time in which to run. Lengthening a period is always safe under rate monotonic; shortening one is not.

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