Design and Implementation of Semi-preemptible IO

  title={Design and Implementation of Semi-preemptible IO},
  author={Zoran Dimitrijevic and Raju Rangaswami and Edward Y. Chang},
Allowing higher-priority requests to preempt ongoing disk IOs is of particular benefit to delay-sensitive multimedia and real-time systems. In this paper we propose Semi-preemptible IO, which divides an IO request into small temporal units of disk commands to enable preemptible disk access. We present main design strategies to allow preemption of each component of a disk access—seek, rotation, and data transfer. We analyze the performance and describe implementation challenges. Our evaluation… CONTINUE READING


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