Virtual memory recovery system using persistent roots for selective garbage collection and sibling page timestamping for defining checkpoint state
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United States of America Patent
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Mar 21, 1989
Grant Date -
N/A
app pub date -
Sep 11, 1985
filing date -
Sep 11, 1985
priority date (Note) -
Expired
status (Latency Note)
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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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