System, method and computer program product for page sharing between fault-isolated cells in a distributed shared memory system
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United States of America Patent
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Nov 14, 2000
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app pub date -
Sep 19, 1997
filing date -
Sep 19, 1997
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Abstract
A system, method and computer program product for sharing memory between fault-isolated cells of a computer system. A page of memory is exported from an exporting cell to an importing cell by selectively opening a hole in a fire-wall that otherwise fault-isolates the exporting cell and the importing cell. The fire-wall opening permits the importing cell to access a specific page of memory in the exporting cell. Access to other memory cells is still prevented by the fire-wall. When a page of memory is exported, a record of the export is generated in the exporting cell. Export records are used to determine whether a requesting cell is permitted to access a requested page of memory and to terminate memory exports in a controlled fashion. When a page of memory is imported, an import record and a proxy page frame data structure are generated in the importing cell. Import records are used to access pages of memory in other cells and to terminate imports in a controlled fashion. Proxy page frame data records are used to maintain fault isolation between cells and to ensure that kernel data is never shared between cells.
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- 15 United States
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Patent Owner(s)
- HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP;MORGAN STANLEY & CO., INCORPORATED
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Schimmel, Curt F | San Ramon, CA | 14 | 863 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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