基于补偿回滚的操作系统故障自恢复技术

A New Operating System Fault Recovery Technique Based on Kernel Compensation and Process State Roll-Back

操作系统故障根据传播特性可分为process-local和kernel-global 2类,分别造成进程局部数据和内核全局状态的错误。现有技术通过重启系统或故障进程实现对进程局部数据错误的恢复,但未考虑内核全局状态的不一致问题,不能保证对kernel-global类型故障的恢复效果。针对以上问题,提出了一种基于补偿回滚的故障自恢复技术。该技术通过监测内核全局方法调用,在进程局部数据被正确恢复的前提下,利用补偿操作对不一致的内核全局状态进行恢复,控制了故障的传播效应,减小了单点故障造成的影响。此外,该技术以内核模块的形式实现,不需要对目标操作系统进行修改,可便捷地实现功能扩展和移植。故障注入实验结果表明,在保证系统功能正常的前提下,该技术能对91.6%的故障进行有效恢复,且带来的系统负载较小。

Sections 1 through 4 of the full paper explain and evaluate a new fault recovery technique based on ker- nel motion compensation and process state roll-back. The core of our thinking and that of sections 1 through 4 con- sists of： （1） past research papers on operating system fault recovery mainly focus on the data loss caused by process-local faults and the global state inconsistency caused by kernel-global faults is neglected; we propose a new fault recovery technique based on kernel motion compensation and process state roll-back model; it can minimize the propagation of faults and ensure the consistency of global state ; this technique is implemented as loadable kernel module which makes it easy to expand functionality ; （2） section 2 presents the design of kernel motion compensa- tion and process state roll-back model ; （3） section 3 presents the implementation details of this technique in Linux operating system; （4） evaluation results presented in section 4 and their analysis show preliminarily the effective- ness of the proposed technique.