Virtual memory recovery system using persistent roots for selective garbage collection and sibling page timestamping for defining checkpoint state
March 21, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3465300 3736566 Memory hierarchy system with journaling and copy back Instruction retry mechanism for a data processing system System for facilitating the copying back of data in disc and tape units of a memory hierarchial system Technique for enabling operation of a computer system with a consistent state of a linked list data structure after a main memory failure Method for assuring atomicity of multi-row update operations in a database system Method and apparatus for logging journal data using a log write ahead data set Enhanced reliability data storage system with second memory for preserving time-dependent progressively updated data from destructive transient conditions Processor-addressable timestamp for indicating oldest written-to cache entry not copied back to bulk memory InventorAssigneeApplicationNo. 06/774828 filed on 09/11/1985US Classes:714/15State recovery (i.e., process or data file)ExaminersPrimary: Williams, Archie E. Jr.Assistant: Wang, Leo Li Attorney, Agent or FirmInternational ClassesG06F 11/14 (20060101)G06F 9/44 (20060101) AbstractPeriodic 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.Other References
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