CAJ | 학술논문

针对预拷贝迁移算法存在拷贝效率低、总迁移时间长和迁移页面多等问题，提出了一种基于预拷贝的虚拟机内存迁移优化方法。该方法根据迁移链路带宽动态确定迁移窗口大小，根据时间局部性和空间局部性原理计算页面脏页率，并通过页面脏页率来确定待迁移页面，实现了对页面脏页率更全面的预测，尽量避免了不必要的重传。实验结果表明，该文优化方法在停机时间、总迁移时间和迁移页面数量等3个方面优于现有的预拷贝方法。
침대예고패천이산법존재고패효솔저、총천이시간장화천이혈면다등문제，제출료일충기우예고패적허의궤내존천이우화방법。해방법근거천이련로대관동태학정천이창구대소，근거시간국부성화공간국부성원리계산혈면장혈솔，병통과혈면장혈솔래학정대천이혈면，실현료대혈면장혈솔경전면적예측，진량피면료불필요적중전。실험결과표명，해문우화방법재정궤시간、총천이시간화천이혈면수량등3개방면우우현유적예고패방법。
As the pre-copy approaches of live VM migration have issues of low copy efficiency,long total migration time and large number of transferred pages,a method of VM memory state transfer op-timization based the pre-copy approaches is proposed here. The size of migration window is determined by the link bandwidth dynamically. The dirty probability of each dirty page is calculated in accordance with the temporal locality and spatial locality principles, and the pages to be transferred are determined by the dirty probabilities. The method can predict the dirty probability more fully and avoid unnecessary retransmission as much as possible. The experiment results show that the optimized approach is better than the existing pre-copy approaches in terms of the downtime, the total migration time and the number of transferred pages.