虚拟机内存轻量级检查点研究

发布时间：2019-03-17 19:37

【摘要】：针对传统的虚拟机检查点粒度大和做检查点时停机时间长的问题,采用空闲内存页面排空、写时复制和增量检查点来解决传统虚拟机检查点的问题,通过这三项技术使检查点技术轻量化.空闲内存页面排空通过在检查点中排除空闲页面,可以减少虚拟机检查点文件的大小;写时复制通过在虚拟机内存写入时进行内存页面复制,可以减少做检查点的时间;增量检查点通过内存增量页面的计算,检查点只包含增量信息,可以减少虚拟机检查点文件的大小.在虚拟化平台Xen上的实验结果表明:采用写时复制技术减少了做检查点过程中虚拟机的停机时间,停机时间不超过300ms,并可使检查点这一过程对上层应用透明;采用内存排空技术和增量技术来做检查点,使得检查点文件的大小减少20%.
[Abstract]:In order to solve the problems of large granularity and long downtime of traditional virtual machine checkpoints, free memory page emptying, write-time replication and incremental checkpoints are used to solve the problems of traditional virtual machine checkpoints. These three techniques are used to make checkpoint technology lightweight. Free memory page emptying can reduce the size of virtual machine checkpoint files by excluding idle pages in checkpoints, and copy while writing can reduce the time to make checkpoints by copying memory pages when virtual machine memory is written. Incremental checkpoints can reduce the size of virtual machine checkpoint files by calculating incremental pages, where checkpoint contains only incremental information. The experimental results on the virtualization platform Xen show that the write-time replication technology reduces the downtime of the virtual machine in the process of making checkpoints, and the downtime is no more than 300 Ms, and makes the checkpoint process transparent to the upper application. Using memory emptying technology and incremental technology to do checkpoint, the checkpoint file size is reduced by 20%.
【作者单位】：华中科技大学计算机科学与技术学院;
【基金】：国家自然科学基金资助项目(61370106) 国家高技术研究发展计划资助项目(2012AA012600)
【分类号】：TP302

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