Electrical computers and digital processing systems: memory – Storage accessing and control
Patent
1997-02-28
1998-10-06
Swann, Tod R.
Electrical computers and digital processing systems: memory
Storage accessing and control
711102, 711104, 711154, 707103, 707203, G06F 1200, G06F 1300, G06F 1730
Patent
active
058193065
ABSTRACT:
A computer system is disclosed which includes a read only memory in which a first version of a data element is stored, a random access memory in which a second version of the data element is stored, and a shadow system for transparently determining whether to access the first or second version of the data element. In the disclosed system, separate areas of memory are maintained for a committed version of the data element and an uncommitted version of the data element. Bottleneck commit routines only allow the uncommitted version to become the committed version of the data element at certain times, such as when the data are not subject to modification. By disposing of the version of the data elements in the uncommitted area, the system effectively reverts to the state it was in at the time changes were last committed from the uncommitted area to the committed area.
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David A. Patterson and John L. Hennessy, Computer Architecture A Quantitative Approach, .COPYRGT.1990, pp. 432-438.
Goldman Phillip Y.
Hertzfeld Andrew J.
General Magic
Swann Tod R.
Terrile Stephen A.
Thai Tuan V.
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