Gerald Allen Davison

US Patent:

6430592, Aug 6, 2002

Filed:

Jun 2, 1994

Appl. No.:

08/252864

Inventors:

Gerald Allen Davison - Ulster Park NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 900

US Classification:

709103, 709107

Abstract:

A computer system allocates processor time to multiple users. A systems operator or other administrator specifies to the computer a share of processor time for each user. The share can be absolute or relative. The system executes users which are I/O bound with processor time less than their respective, specified share(s) by not using significant processor time on users which are waiting for an I/O operation to complete but expediting allocation of a processor to users after their respective I/O operations complete. The system executes users which are CPU bound with processor time greater than their respective, specified share(s) based on their respective shares in relation to a sum of shares of other CPU bound users but excluding shares of I/O bound users. For each user there is also a specified âsoft limitâ, âhard limitâ or âno limitâ. When any hard limit user reaches its hard limit, no further allocation is made.

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.

Author:

Gerald Davison

ISBN #:

0471012750

Author:

Gerald C. Davison

ISBN #:

0470076038

Author:

Gerald C. Davison

ISBN #:

0470077263

Author:

Gerald C. Davison

ISBN #:

0470079320

Author:

Gerald C. Davison

ISBN #:

0470831839

Author:

Gerald C. Davison

ISBN #:

0471005819

Author:

Gerald C. Davison

ISBN #:

0471039438

Author:

Gerald C. Davison

ISBN #:

0471076333