Mixed Criticality Systems with Weakly-Hard Constraints

Current adaptive mixed criticality scheduling policies as-sume a high criticality mode in which all low criticality tasks are descheduled to ensure that high criticality tasks can meet timing constraints derived from certification ap-proved methods. In this paper we present a new scheduling policy, Adaptive Mixed Criticality- Weakly Hard, which provides a guaranteed minimum quality of service for low criticality tasks in the event of a criticality mode change. We derive response time based schedulability tests for this model. Empirical evaluations are then used to assess the rel-ative performance against previously published policies and their schedulability tests. Categories and Subject Descriptors C.3 [Special-Purpose and Application-Based]: Real-time and embedded system