Boots – shoes – and leggings
Patent
1993-08-26
1994-05-31
Dixon, Joseph L.
Boots, shoes, and leggings
395425, 364DIG1, 3642282, 3642321, 3642557, 3642564, G06F 1202
Patent
active
053177053
ABSTRACT:
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.
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TDB, vol. 19, No. 7, Dec. 1976, "Table Lookaside Buffer with Selective Space Invalidation"/M. Kerrigan and J. Newman.
Gannon Patrick M.
Gum Peter H.
Hough Roger E.
Murray Robert E.
Dixon Joseph L.
Goldman Bernard M.
International Business Machines - Corporation
Nguyen Hiep T.
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