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Which change would NOT reduce the worst-case interrupt latency of a system?

  • A.choosing a core that saves context in hardware
  • B.adding more instructions to the service routine
  • C.shortening the longest region in which interrupts are disabled
  • D.raising the priority of the source concerned

Answer: B

A longer handler lengthens the time before the *next* interrupt is served but has no effect on the latency of this one, and it makes matters worse for everything else. The other three all attack a real component of the delay.

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