汽车电子软件中混合调度方式下响应时间分析

Response Time Analysis for Vehicle Electronic Software under Hybrid Scheduling

针对汽车电子控制领域OSEK/VDX标准所支持的混合调度方式下的响应时间分析问题,提出了一种使用线性事务模型时的响应时间分析方法。该方法考虑了事务的释放抖动和混合抢占对响应时间的影响,将时间分析理论扩大到混合调度方式下的响应时间分析中,可以用于验证汽车电子软件的实时性。试验表明:该方法准确度高、复杂度低;混合调度对事务平均最差情况下的响应时间的影响很小,但对系统的可调度性有一定的负面影响。

Aiming at the problem of response time analysis under hybrid scheduling, an important scheduling mode supported by OSEK/VDX standard in vehicle electronic control field, a response time analysis method for linear transactions was presented. This method considered the influence of release jitters of transactions and the hybrid preemption on response time of transactions, extending timing analysis theory to the response time analysis of linear transactions under fixed priority hybrid scheduling. It can be used to verify the real--time property of vehicle electronic software. Experiments show this method has lower computational complexity while keeping high accuracy, and hybrid scheduling has little influence on the average worst--case response time, but has some negative influence on the shedulability of systems.