Directory look-aside table for a virtual storage system includin

Details Directory look-aside table for a virtual storage system includin Directory look-aside table for a virtual storage system includin

1991-08-12

1994-06-07

Robertson, David L.

G06F 1300

Patent

active

053197615

ABSTRACT:
An improved DLAT structure distinguishes between address spaces and data spaces. The DLAT structure classifies data spaces by one or more space identifications which control assignment of virtual page addresses to DLAT rows. In one embodiment, a "private space bit" is used to select different DLAT addressing algorithms. In another embodiment, data spaces are sub-classified using space identification bits, and for each sub-class, a unique algorithm is selected based on the page address bits. An Exclusive OR function is used to generate the DLAT selection bits. This approach minimizes private space synonyms while maximizing common space synonyms. The result is improved performance since the former minimizes thrashing and the latter maximizes the value of the DLAT common bit.

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patent: 5134696 (1992-07-01), Brown et al.
patent: 5157777 (1992-10-01), Lai et al.

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