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

TY - JOUR

T1 - Explicit Reservation of Cache Memory in a Predictable, Preemptive Multitasking Real-time System

AU - Whitham, Jack David

AU - Audsley, Neil Cameron

AU - Davis, Robert Ian

PY - 2014/7

Y1 - 2014/7

N2 - 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.

AB - 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.

U2 - 10.1145/2523070

DO - 10.1145/2523070

M3 - Article

SN - 1539-9087

VL - 13

SP - 1

EP - 25

JO - ACM Transactions in Embedded Computing Systems

JF - ACM Transactions in Embedded Computing Systems

IS - 4

ER -