A new utilization based admission control algorithm for aperiodic tasks with constant time complexity under EDF scheduling

A low cost on-line admission controller is required by hard real-time system working in dynamic circumstances. In this paper, we propose a new utilization based constant-time admission control algorithm, called AC for aperiodic tasks under EDF scheduling. We prove that given the same processor state, AC is safe and has stronger admission capability than the best existing utilization-based admission control algorithm with constant-time complexity. Simulation results show that AC also has good performance in success ratio and efficiency.