1 操作系统的组成、服务、特征 System components OS Services System Calls & Types system programs 操作系统的特征 2 操作系统的抽象模型和体系结构 进程模型 线程模型 OS structure Virtual Machine 系统设计与实现
• 实时任务约束模型 – Assumptions about task timing, interaction • 任务调度算法Scheduling Algorithm – Scheduling mode and selection function • Timeliness: deadline,worst response time,。。。 • efficiency: average response time,makespan – Prioritized goals • Temporal predictability first,performance second • 可调度分析Schedulability Test – Prediction of worst-case behavior – 基于CPU利用率(workload analysis) • for preemptive and strictly periodic tasks? – WCRT(Response time analysis) • for preemptively feasible task sets with D ≤ T • Timing Analysis(WCET分析)