Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Patent
1997-09-19
2000-11-14
Yoo, Do Hyun
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
711147, 711148, 395680, G06F 1200
Patent
active
061483796
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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Namazi Mehdi
Silicon Graphics Inc.
Yoo Do Hyun
LandOfFree
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