G - Physics – 06 – F
Patent
G - Physics
06
F
354/243
G06F 12/14 (2006.01) G06F 9/46 (2006.01) G06F 12/08 (2006.01) G06F 12/10 (2006.01)
Patent
CA 1266533
ABSTRACT A method for automatically extending the size of a segment in a page segmented virtual memory data processing system. The method increases the size of a segment in blocks of 64K virtual pages in response to the system detecting that the requested page has been protected. The conventional UNIX type System Calls create and open files in virtual memory. All pages are protected "read only" until a SHMAT type System Call is made to operate on a page at a specific address. At that point in the process, a protection exception is recognized by the system and the UNIX kernel takes control to remove the protection and update the appropriate data structures to reflect the new status of the page and the addresses in real memory where the page may be found. Segments containing mapped files are also extended by the method.
523242
Duvall Keith E.
Hooten Anthony D.
O'quin John C. III
Smith Todd A.
Duvall Keith E.
Hooten Anthony D.
International Business Machines Corporation
Kerr Alexander
O'quin John C. III
LandOfFree
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