ATMP: An Adaptive Tolerance-based Mixed-criticality Protocol for Multi-core Systems

Abstract

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ATMP-CA: Optimising Mixed-Criticality Systems Considering Criticality Arithmetic

“…Iacovelli et al developed a mid-term mixed-criticality scheduler [11], called ATMP. As a mid-term scheduler, ATMP performs scheduling decisions not at the granularity of task arrival/completion, but rather after a period of observation, to adjust the system load appropriately.…”

“…The adaptive tolerance-based mixed-criticality protocol (ATMP) [11] is an application of the TRTCM [13,25] that maximises the system utility on each core by adjusting the periods of tasks within their tolerance range. The basic implementation of ATMP categorises system tasks according to their adaptation capability.…”

“…The purpose of this allocation is to assign the tasks to a core. Later, within each core, as part of the utility optimisation, which is the same as in ATMP [11], some tasks might be removed again from a core in order to pass the schedulability test.…”

“…Specifically, we present a mixed-criticality scheduler that takes into account information about where criticality arithmetic has been used in the system. Our example is based on the ATMP scheduler from Iacovelli et al [11]. This scheduler provides better handling of tasks that are replicated for criticality arithmetic compared with a similar reference without awareness of criticality arithmetic.…”

Design Patterns to Build Large Resilient and Predictable Systems

“…Figure 5 shows an example for modelling the utility of the throughput of a service. Using these utility values of the individual services, we can optimise the overall system utility in case of a situation that causes a resource shortage [2]. A real-time system based on single-value deadlines lacks information to be used for a smooth degradation of overall system utility in case of resource shortages.…”