Explicit reservation of cache memory in a predictable, preemptive multitasking real-time system

  • Authors:
  • Jack Whitham;Neil C. Audsley;Robert I. Davis

  • Affiliations:
  • University of York;University of York;University of York

  • Venue:
  • ACM Transactions on Embedded Computing Systems (TECS)
  • Year:
  • 2014

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Abstract

We describe and evaluate explicit reservation of cache memory to reduce the cache-related preemption delay (CRPD) observed when tasks share a cache in a preemptive multitasking hard real-time system. We demonstrate the approach using measurements obtained from a hardware prototype, and present schedulability analyses for systems that share a cache by explicit reservation. These analyses form the basis for a series of experiments to further evaluate the approach. We find that explicit reservation is most useful for larger task sets with high utilization. Some task sets cannot be scheduled with a conventional cache, but are schedulable with explicit reservation.