PURPOSE: To increase processing speed in a computer of virtual memory control system, by using an auxiliary memory space copy managing table provided corresponding to an auxiliary memory space map.
CONSTITUTION: The auxiliary memory space copy managing table E corresponds to all of the pages of the auxiliary memory space map C, and the page having the content of zero in the table E shows the nounse of the page of a corresponding auxiliary memory space. The page having the number of the content other than zero shows that the table of respective corresponding auxiliary memory space is referred at present by the program of the number. The content of each page of the auxiliary memory space copy managing table E is set at 1 when the page of corresponding auxiliary memory space can be obtained, and one is added at every copying of the page, and one is subtracted at every page-in, or every deletion of the page, and when a result shows 0, the page of the auxiliary memory space is designated as a vacant page.
NAKAJIMA MASATOSHI
ISHIDA WATARU
NAKAYAMA YOSHIHIRO
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