Virtual memory paging apparatus with variable size in-page clust

Details Virtual memory paging apparatus with variable size in-page clust Virtual memory paging apparatus with variable size in-page clust

1989-06-29

1992-06-23

Hecker, Stuart N.

Boots, shoes, and leggings

364DIG1, G06F 1206

Patent

active

051250861

ABSTRACT:
A virtual memory management system and method in which the mechanism for swapping in pages of memory in secondary storage replaces the overhead of retrieving pages from secondary storage by swapping logically contiguous clusters of pages each time that a page from secondary memory is needed. To improve the efficiency of in-page clustering, the size of the clusters which are read in are heuristically adjusted. Clustered pages are not entered into the working set until they are accessed by the process. Instead, the cluster of pages read in from secondary memory are initially entered a "standby list" of pages which are more eligible for reallocation than pages in the working set of the process. If the process does not access a particular cluster page within a relatively short period of time of its entry onto the standby list it is reallocated by the system's memory manager. In this way, in-page cluster pages do not replace potentially more valuable pages in the working set until those pages are actually requested by the process. Depending on whether the cluster pages are used before being reallocated, cluster sizes in corresponding portions of the virtual memory space are increased or decreased.

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