JPH02238535A - Page number variable on-demand paging system - Google Patents

Abstract

PURPOSE:To attain an effective paging system by deciding dynamically both the page-out page and page-in page numbers after checking the access page intervals based on the page access history information. CONSTITUTION:A page access history information collection mechanism 2 collects the page access history information via a time monitor mechanism 1 every certain time interval. The page access history information shows whether or not the reading/writing jobs are applied to the pages secured by the programs A and B running on an operating system OS. A page number deciding mechanism 3 decides collectively both the page-out page and page-in page numbers based on the page access history information. A page-out mechanism 4 pages out collectively the information stored in a memory to a secondary medium 6 by an amount equal to the page-out page number decided by the mechanism 3 when the memory load is increased and the necessity of a page-out job is decided. A page-in mechanism 5 pages in the information to the memory from the medium 6 based on the page-in page number decided by the mechanism 3. Thus the effective paging jobs are attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a page number variable type on-demand paging method in an OS of a computer system having on-demand paging virtual storage method memory management.

[Conventional technology]

Conventionally, the number of paging pages in virtual memory memory management using on-demand paging is a fixed value.
It never had a dynamically variable value.

In addition, the number of page-out pages is a certain value within the system, and the number of page-in pages is also a fixed value.
It was not possible to dynamically change the number of pages during system operation.

[Problem to be solved by the invention]

In the conventional on-demand paging method described above, both the number of page-out pages and the number of page-in pages are fixed values, and cannot be dynamically changed during system operation. Therefore, there is a problem in that the number of paging pages cannot be changed in order to perform paging efficiently depending on the memory access state of the program.

[Means to solve the problem]

The configuration of the on-demand paging method with a variable number of pages of the present invention is based on a time monitoring method that performs time monitoring in an on-demand paging method that uses paging in a virtual memory method in an operating system (hereinafter referred to as OS) in a computer system. a page access history information collection mechanism that collects page access history information at certain time intervals using this time monitoring mechanism; A page number determination mechanism that examines the interval and dynamically determines the number of page-out pages and page-in pages based on the access page interval, and a page-out mechanism that executes page-out and page-in based on the determined number of pages. and a page-in mechanism.

〔Example〕

Next, one embodiment of the present invention will be described using the drawings.

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, in which A and B are programs running on the OS, 1 is a time monitoring mechanism, 2 is a page access history information collection mechanism, 3 is a page number determination mechanism, 4 is a page out mechanism,
5 is a page-in mechanism, and 6 is a secondary medium.

READ/WRITE! to the pages secured by programs A and B running on the OS. , etc., the page access history information collection mechanism 2 uses the time monitoring mechanism 1 to collect page access history information at certain time intervals.

The page number determination mechanism 3 checks the spatial continuity of pages accessed by programs A and B based on the page access history information collected by the page access history information collection mechanism 2, and determines the number of page out pages at once. Determine the number of page-in pages.

When the page-out mechanism 4 determines that the memory load becomes high and page-out is necessary, the page-out mechanism 4 pages out the information in the memory at once to the secondary medium 6 for the number of page-out pages determined by the page number determination mechanism 3. 6 In addition, the page-in mechanism 5 pages in information into the memory using the secondary medium 6 according to the number of page-in pages determined by the page number determining mechanism 3 when page-in becomes necessary.

〔Effect of the invention〕

As explained above, the present invention collects page access history information at each certain time interval, uses the collected page access information to check the access page interval in a logical space at each certain time interval, and calculates the page interval between pages. By dynamically determining the number of page-out pages and the number of page-in pages, and performing page-out and page-in according to the determined number of pages, there is an effect that paging can be performed efficiently.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. A, B...Program, 1...Time monitoring mechanism, 2.
. . . page access history information collection mechanism, 3 . . page number determination mechanism, 4 . . . page-out mechanism, 5 . . . page-in mechanism.

Claims (1)

[Claims] In the on-demand paging method that uses paging in the virtual memory method of the operating system (hereinafter referred to as OS) in a computer system, there is a time monitoring mechanism that monitors time and page access at certain time intervals by this time monitoring mechanism. Based on the page access history information collection mechanism that collects history information and the collected page access history information, the access page interval is checked in a logical space per certain period of time, and the number of page-out pages is calculated based on the access page interval. and a page number determination mechanism that dynamically determines the number of page-in pages, and a page-out mechanism and a page-in mechanism that execute page-out and page-in based on the determined number of pages. This is an on-demand paging method with a variable number of pages.