05317705 is referenced by 199 patents and cites 13 patents.

A system for reducing purging of a translation lookaside buffer (TLB) to reduce operating system overhead in a system running multiple levels of virtual machines. A system typically must purge TLB entries whenever an underlying page table entry is invalidated due to paging activity on the host machine, or an underlying guest machine. A system for reducing the number of cases in which guest translations are based on host page table entries is provided. Additional logic is supplied to analyze each invalidate page table entry (IPTE) instruction to minimize the extent of purging required as a result of that instruction. When the region relocate facility is in operation, or when no pageable TLB's have been constructed, only the entry corresponding to the page table entry to be invalidated need be purged. This limited purging reduces the overhead by reducing the time spent in purging and the time required in address translation to rebuild the TLB. This time saving results in increased performance in systems with multi-level guests.

Title
Apparatus and method for TLB purge reduction in a multi-level machine system
Application Number
605192
Publication Number
5317705
Application Date
August 26, 1993
Publication Date
May 31, 1994
Inventor
Robert E Murray
Woodstock
NY, US
Roger E Hough
Highland
NY, US
Peter H Gum
Poughkeepsie
NY, US
Patrick M Gannon
Poughkeepsie
NY, US
Agent
Bernard M Goldman
Assignee
International Business Machines Corporation
NY, US
IPC
G06F 12/10
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