基于内存迭代拷贝的Xen虚拟机动态迁移机制研究

摘要

In order to reduce the dynamic migration time of virtual machine,the pre-copy algorithm was used in Xen virtual to choose the right time for downtime copy to guarantee the superior performance of virtual machine's migration in low load or empty load.But with heavy load,Pre-copy algorithm needs to iterative repeatly to the memory pages,which affects processing performance seriously.With algorithm of Xen virtual machine iterative copies,we proposed a mechanism of fragments interative copies to reduce virtual machine live migration time by cutting the termination of time to iterative copy.The results of experiment show that mechanism of memory fragment iteration enhances performance of the live migration of Xen virtual machine.%为减少虚拟机动态迁移时间,Xen采用了Pre-Copy算法来选择合适的时间进行停机拷贝,以保证在低负载或空负栽时的虚拟机迁移的优越性能,但在高负栽环境下,Pre-Copy算法对内存页的重复迭代严重影响了虚拟机迁移的效率.基于Xen虚拟机内存迭代拷贝算法,提出了一种内存分片迭代拷贝机制,即通过缩短迭代拷贝的终止时间来减少虚拟机动态迁移所花费的时间.实验结果表明,内存分片迭代机制可以有效提升Xen虚拟机动态迁移的性能.