Enhancing real-time schedules to tolerate transient faults
Ghosh, S.; Melhem, R.; Mosse, D.
Real-Time Systems Symposium, 1995. Proceedings., 16th IEEE
Volume , Issue , 5-7 Dec 1995 Page(s):120 - 129
Digital Object Identifier   10.1109/REAL.1995.495202
Summary:We present a scheme to guarantee that the execution of real-time tasks can tolerate transient and intermittent faults assuming any queue-based scheduling technique. The scheme is based on reserving sufficient slack: in a schedule such that a task can be re-executed before its deadline without compromising guarantees given to other tasks. Only enough slack is reserved in the schedule to guarantee fault tolerance if at most one fault occurs within a time interval. This results in increased schedulability and a very low percentage of deadline misses even if no restriction is placed on the fault separation. We provide two algorithms to solve the problem of adding fault tolerance to a queue of real-time tasks. The first is a dynamic programming optimal solution and the second is a greedy heuristic which closely approximates the optimal

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