05319760 is referenced by 161 patents and cites 16 patents.

A central processing unit (CPU) executing a virtual memory management system employs a translation buffer for caching recently used page table entries. When more than one process is executing on the CPU, the translation buffer is usually flushed when a context switch is made, even though some of the entries would still be valid for commonly-referenced memory areas. An address space number feature is employed to allow entries to remain in the translation buffer for processes not currently executing, and the separate processes or the operating system can reuse entries in the translation buffer for such pages of memory that are commonly referenced. To allow this, an "address space match" entry in the page table entry signals that the translation buffer content can be used when the address tag matches, even though the address space numbers do not necessarily match. When executing virtual machines on this CPU, with a virtual machine monitor, the address space match feature is employed among processes of a virtual machine, but an additional entry is provided to disable the address space match feature for all address space numbers for the virtual machine monitor.

Title
Translation buffer for virtual machines with address space match
Application Number
7/722869
Publication Number
5319760
Application Date
June 28, 1991
Publication Date
June 7, 1994
Inventor
Richard T Witek
Littleton
MA, US
Paul T Robinson
Arlington
MA, US
Judith S Hall
Sudbury
MA, US
Andrew H Mason
Hollis
NH, US
Agent
Arnold White & Durkee
Assignee
Digital Equipment Corporation
MA, US
IPC
G06F 12/10
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