Partial recording of a computer program execution for replay

摘要

A method, system and program product for recording a program execution comprising recording processor context for each thread of the program, results of system calls by the program, and memory pages accessed by the program during an execution interval in a checkpoint file. Processor context includes register contents and descriptor entries in a segment descriptor table of the operating system. System calls are recorded for each program thread, tracked by an extension to the operating system kernel and include returned call parameter data. Accessed memory pages are recorded for each program process and include data, libraries and code pages. The program address space, processor context, and program threads are reconstructed from checkpoint data for replaying the program execution in a different operating system environment.

主权项

1. A computer-implemented method, comprising:
creating a shadow process for a program process being executed; in response to an accessed memory page being modified by the program process, recording an original copy of the modified memory page obtained from the shadow process in a partial checkpoint; and replaying a program execution using the partial checkpoint.