Linux实时调度方案的设计与实现  

Design and Implementation of Real-Time Scheduling in Linux

作　　者：李小群[1] 赵慧斌[1] 叶以民[1] 孙玉芳[1] 

机构地区：[1]中国科学院软件研究所,北京100080

出　　处：《计算机研究与发展》2003年第5期728-733,共6页Journal of Computer Research and Development

基　　金：自然科学基金项目 (60 0 73 0 2 2 );国家"八六三"高技术研究发展计划项目(863 3 0 6 ZD12 14 2);中科院知识创新重大项目 (KGCX1 0 9)

摘　　要：作为一个分时系统 ,Linux的设计目标为提高吞吐率和平均响应时间 ,因此采取了基于时间片的调度策略 ,显然这种机制无法保证实时任务得到及时响应和调度 为了改进Linux操作系统的实时性能 ,探讨了基于Linux的实时操作系统RFRTOS中的实时调度机制 实验验证 ,所做改进有效地提高了Linux的调度精度 。In order to balance response time and throughput and to ensure fair distribution of CPU time among process, Linux, as a time sharing system, schedules CPU time using fixed time slices, but it can not guarantee the high predictability requirements of real time task In order to improve the real time performance of Linux OS, the real time scheduling support in RFRTOS based on Linux is discussed The experiments on the modified OS show that the improvement gives a better result for applications with real time constraints than original Linux kernel and satisfies the need of soft real time

关 键 词：LINUX 实时操作系统 预留资源 资源集 堆 实时调度 SMP 

分 类 号：TP316[自动化与计算机技术—计算机软件与理论]