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Does the AP scheduler inhibit IO interupts?

April 26, 2017AP inhibit IO scheduler

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Does the AP scheduler inhibit IO interupts?

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Yes. The AP scheduler calls InterruptDisable(), for slightly longer than the time required to call ClockCycles(), each time it must microbill. It does not inhibit interrupts an any other time. That includes not inhibiting interrupts to get mutual exclusion between the clock interrupt handler, scheduling algorithm, getting partition statistics or changing budgets.