嵌入式Linux的实时化改造及其在故障录波器中的应用

Real-time Improvements of Embedded Linux for Fault Recorders

提出一种基于普通内核+RTLinux+抢占内核补丁的三核Linux实时化改造方案,并将其应用于故障录波器。研究了该三核操作系统的工作原理,采用双缓存技术提高前后台之间通信的实时性。运用Stress-Kernel RPM包和Amlat软件测试了该嵌入式Linux的实时性能,最大实时响应时间为1.2 ms,99.999%的中断响应时间都小于1 ms。仿真测试结果表明该三核Linux平台能满足故障录波的实时性处理要求。

A three-nucleus real-time improvement scheme based on the normal core＋ RTLinux patch＋ kernel preemption patches is proposed for its application in the fault recorder.The operation principle of three-nucleus Linux is described.The key technology of double buffer is designed to improve the real-time performance of recording data transmission.The testing software of Stress-Kernel RPM package and Amlat are used to test the new platform.The real-time maximum response of three-nucleus platform is 1.2 ms,while 99.999% of the interrupts are lower than 1 ms.Test results show that the three-nucleus Linux platform can satisfy the real-time processing requirement of the fault recorder.