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Explicit Reservation of Cache Memory in a Predictable, Preemptive Multitasking Real-time System

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JournalACM Transactions in Embedded Computing Systems
DatePublished - Jul 2014
Issue number4
Volume13
Number of pages25
Pages (from-to)1-25
Original languageEnglish

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.

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