Real-time Scheduling Algorithm with Execution Right Delegation for Multiprocessor

Abstract

Rate Monotonic (RM) is one of the widely used real-time scheduling algorithms. In RM, tasks with shorter periods are given higher priorities and tend to have short response times and jitters. In contrast, those with longer periods are likely to suffer from increased response times and jitters due to their lower priorities. We proposed the Execution Right Delegation (ERD) method for uniprocessor systems based on RM where a high-priority server for a privileged (or important) task is introduced to shorten response times of the task. In our previous paper, we proposed an extended ERD method for two-core multiprocessor systems in which the system model is based on partitioned systems while only a privileged task can migrate. In this paper, we relax the restriction of the number of cores. In addition, the number of privileged tasks that was previously limited to one is expanded to two. In the evaluation, it is confirmed that response times of privileged tasks are reduced compared with partitioned Fixed-Task-Priority (FTP) and global FTP scheduling.