Schedulability Tests for Tasks With Variable Rate-Dependent Behaviour Under Fixed Priority Scheduling
Automotive embedded real-time systems such as engine management utilize cyclic tasks that are activated periodically based on angular rotation rather than time. As well as having variable inter-arrival times, these tasks also have deadlines and worst-case execution times that are dependent on angular velocity i.e. engine speed or rpm. Such tasks exhibit Variable Rate-dependent Behavior (VRB). In this paper, the authors introduce response time analysis for systems comprising VRB and sporadic tasks under fixed priority scheduling.