Method and system for storing data in and retrieving data from a

Details Method and system for storing data in and retrieving data from a Method and system for storing data in and retrieving data from a

1988-11-21

1992-10-27

Levy, Stuart S.

Boots, shoes, and leggings

364DIG1, G06F 1208

Patent

active

051596776

ABSTRACT:
A non-main storage data space (NMDS) is presented, whose virtual pages may be backed by expanded storage, by a combination of expanded and auxiliary storage, but not by main storage. Mechanisms are provided to prevent direct referencing of data in a NMDS by instructions, and to bring data into and out of NMDS's. The I/O mechanisms minimize physical I/O by exchanging pointers to backing pages in appropriate cases. Additionally, control is returned immediately to I/O-initiating applications, when I/O is required between an address space and a NMDS, without the need for synchronization by the application: the mechanism provides for synchronization by the system's page fault processing.

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