A Study on CPU Time Reservation for QoS Guarantee in a Virtual Machine Environment

我们研究了一个虚拟机环境，在这个环境中，调度理论和资源管理框架可以用于CPU时间预留。调度理论通过集成虚拟机内的CPU时间预留请求，可以为虚拟机提供足够的CPU时间。在虚拟机环境中，有两个调度级别，一个在操作系统中，另一个在虚拟机中。操作系统调度虚拟机，在虚拟机中调度任务。因此，必须集成CPU时间预留请求，以便操作系统可以调度虚拟机以满足其内部的CPU时间预留请求。资源管理框架在调度理论的基础上起着分配CPU时间的实际作用。该框架将虚拟机的调度参数提供给操作系统内核，虚拟机为每个任务重新分配CPU时间，从而满足任务的CPU预留请求。我们还开发了一个虚拟机环境的原型，它可以成为上述调度理论和资源管理框架的基础。原型机在Intel IA-32处理器上运行，并支持Linux和RTOS作为操作系统。

We studied a virtual machine environment, in which the scheduling theory and the resource management framework for CPU time reservation can be enabled. The scheduling theory makes it possible to give enough CPU time to a virtual machine by integrating CPU time reservation requests within the virtual machine. In a virtual machine environment, there are two scheduling levels, one at an operating system and the other in a virtual machine. The operating system schedules a virtual machine, and a task is scheduled in the virtual machine. Therefore, CPU time reservation requests must be integrated, so that the operating system can schedule a virtual machine in order to meet the CPU time reservation requests within it. The resource management framework takes a role of actually assigning the CPU time based on the scheduling theory. The framework gives the scheduling parameter of a virtual machine to the operating system kernel, and the virtual machine reassigns CPU time to each task, so that the task's CPU time reservation request is fulfilled.We also developed a prototype of a virtual machine environment, which can become the base of the scheduling theory and the resource management framework described above. The prototype operates on the Intel IA-32 processor, and supports Linux and RTOS as operating systems.