Method and system for task memory management in a multi-tasking

Details Method and system for task memory management in a multi-tasking Method and system for task memory management in a multi-tasking

1992-10-07

1994-01-04

Shaw, Gareth D.

Boots, shoes, and leggings

364DIG1, 3642466, 3642817, 3647814, 3642281, G06F 946

Patent

active

052768783

ABSTRACT:
A method and system are disclosed for efficiently managing task memory in a multi-tasking data processing system having a processor for processing multiple tasks, task memory associated with each task, main system memory and multiple data records stored within direct access storage. A data record is copied from direct access storage into a buffer in main system memory in response to an access of that data record by a particular task. A buffer within that task's virtual memory is then mapped to the data record and a write protect bit is associated with the task memory buffer. Thereafter, any attempt to store data into the buffer will temporarily halt processing of the task until a copy of the data record is written to a second buffer. Task processing is then resumed, after modifying the task's page table to reference the second buffer, and the task is then permitted to store data within the second buffer. In this manner, a second buffer copy of the data record is only created in response to an attempted modification of the data record, thereby minimizing the processor and memory assets required to manage data records in a multi-tasking data processing system.

REFERENCES:
patent: 4249241 (1981-02-01), Aberle et al.
patent: 4399504 (1983-08-01), Obermarck et al.
patent: 4545016 (1985-10-01), Berger
patent: 4742447 (1988-05-01), Duvall et al.
patent: 4742450 (1988-05-01), Duvall et al.
patent: 4757447 (1988-07-01), Woffinden
patent: 4761737 (1988-08-01), Duvall et al.
patent: 4805097 (1989-02-01), DeSanna
patent: 4937736 (1990-06-01), Chang et al.
patent: 5012408 (1991-04-01), Conroy
patent: 5095420 (1992-03-01), Eilert et al.
patent: 5113506 (1992-05-01), Moussouris et al.
patent: 5125086 (1992-06-01), Perazzoli, Jr.
patent: 5155844 (1992-10-01), Cheng et al.
patent: 5197148 (1993-03-01), Blount et al.
Andrew S. Tanenbaum, "Modern Operating Systems," 1992, 491-492.

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