Roger W Rogers

US Patent:

8495261, Jul 23, 2013

Filed:

Dec 12, 2008

Appl. No.:

12/333485

Inventors:

Roger W. Rogers - Lagrangeville NY, US
Barry E. Willner - Briarcliff Manor NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 3/00
G06F 5/00
G06F 13/24
G06F 12/00
G06F 13/00
G06F 9/26
G01R 31/08

US Classification:

710 48, 710 6, 710 7, 710 20, 710 39, 710260, 711133, 711145, 711170, 711173, 711207, 370216

Abstract:

Input/output (I/O) interrupts are avoided at the completion of I/O operations. A task requests (implicitly or explicitly) an I/O operation, and processing of the task is suspended awaiting completion of the I/O operation. At the completion of the I/O operation, instead of an I/O interrupt, an indicator associated with the task is set. Then, when the task once again becomes the current task to be executed, the indicator is checked. If the indicator indicates the I/O operation is complete, execution of the task is resumed.

US Patent:

46740384, Jun 16, 1987

Filed:

Dec 28, 1984

Appl. No.:

6/687073

Inventors:

David P. Brelsford - Hyde Park NY
Daniel D. Cerutti - Kingston NY
Leslie S. Coleman - Rhinebeck NY
Gerald A. Davison - Ulster Park NY
Pamela H. Dewey - Poughkeepsie NY
Margaret C. Enichen - Poughkeepsie NY
Sarah T. Hartley - Poughkeepsie NY
Paul A. Malinowski - Poughkeepsie NY
Roger W. Rogers - Poughkeepsie NY
Peter H. Tallman - Wappingers Falls NY
Lynn A. Czak - Rhinebeck NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 944
G06F 1100

US Classification:

364200

Abstract:

The invention disclosed and claimed herein provides a method for a virtual machine, which maps to the V=R region of a host machine's address space, to resume program execution successfully when the host operating system terminates and subsequently restarts successfully after the occurrence of a system incident. The system incident brings the computer system down, but with a reasonable chance that the system will be able to bounce. A bounce occurs when the host operating system nucleus is reinitialized or refreshed. The virtual machine will be allowed to survive the system incident as long as its integrity can be maintained, i. e. as long as its status and in-progress work can be preserved. The status and in-progress work of the virtual machine is preserved in a reserved region of host storage in such a way that the time to save and restore virtual machine status is reduced, I/O that might cause further system incidents are avoided and the complexity of restoration of the virtual machine during a system incident is reduced.