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The laxity or slack of a task at an instant is

  • A.the time to its deadline less the execution it still needs
  • B.the time since it was released
  • C.the difference between its period and its deadline
  • D.the fraction of the processor it demands

Answer: A

Zero laxity means it must run continuously from now to meet its deadline, and negative laxity means the deadline is already lost. Scheduling by least laxity first is optimal in the same sense as earliest deadline first.

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