06789156 is referenced by 213 patents.

A computer system has one or more software context that share use of a memory that is divided into units such as pages. In the preferred embodiment of the invention, the context are, or include, virtual machines running on a common hardware platform. The context, as opposed to merely the addresses or page numbers, of virtual memory pages that accessible to one or more contexts are examined. If two or more context pages are identical, then their memory mappings are changed to point to a single, shared copy of the page in the hardware memory, thereby freeing the memory space taken up by the redundant copies. The shared copy is ten preferable marked copy-on-write. Sharing is preferably dynamic, whereby the presence of redundant copies of pages is preferably determined by hashing page contents and performing full content comparisons only when two or more pages hash to the same key.

Title
Content-based, transparent sharing of memory units
Application Number
9/915045
Publication Number
6789156 (B1)
Application Date
July 25, 2001
Publication Date
September 7, 2004
Inventor
Carl A Waldspurger
Atherton
CA, US
Agent
Jeffrey Pearce
US
Assignee
VMWare
CA, US
IPC
G06F 12/02
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