Virtual memory recovery system using persistent roots for select

Details Virtual memory recovery system using persistent roots for select Virtual memory recovery system using persistent roots for select

1985-09-11

1989-03-21

Williams, Jr., Archie E.

Boots, shoes, and leggings

371 12, G06F 1108, G06F 1116

Patent

active

048149713

ABSTRACT:
Periodic checkpoints are taken of the state of a computer system and its virtual memory. If a system crash occurs, the machine state can be rolled back to the checkpoint state and normal operation restarted. Pages of virtual memory are timestamped to indicate whether they are included in the checkpoint state. Modifications made after the checkpoint time are discarded when the system state is rolled back to the saved checkpoint state. Some recordkeeping is maintained outside of the virtual memory address space in order to assist with the recovery process.

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"Recovery Techniques for Database Systems", J. Verhofstad, ACM Computing Surveys, vol. 10, No. 2, Jan. 1978, pp. 165.195.

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