嵌入式Linux优先级反向问题的研究

Study of Priority Inversion in Embedded Linux

针对进程调度中出现的优先级反向问题,通过对Linux内核进程调度的研究,分析了优先级反向产生的原因、基于信号量的互斥锁结构,并在对互斥锁进行修改的基础上实现了优先级继承协议.结果证明:互斥锁的优先级继承协议降低了内核调度延迟时间,提高了系统的实时性.

Aiming at the priority inversion of the process scheduling, through the analysis of the process scheduling in Linux kernel. this paper mainly studies the reason leading to priority inversion and the mutex based on semaphore , it also makes priority inheritance protocol into operation through modified the mutex. The priority inheritance protocol of the mutex reduces scheduling postone and enhances the real - time performance, which has been proved by the experimentation.