Execution of an instruction for performing a configuration virtual topology change
AssigneeInternational Business Machines Corporation
InventorsMark S Farrell, Charles W Gainey, Jeffrey P Kubala, Donald W Schmidt
Life of this patent
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Abstract
In a logically partitioned host computer system comprising host processors (host CPUs) partitioned into a plurality of guest processors (guest CPUs) of a guest configuration, a perform topology function instruction is executed by a guest processor specifying a topology change of the guest configuration. The topology change preferably changes the polarization of guest CPUs, the polarization being related to the amount of a host CPU resource provided to a guest CPU.
Claims20
A computer implemented method comprising:
- executing, by a processor, a perform topology function instruction for requesting a configuration change of a topology of a plurality of processors (CPUs) of a configuration, the executing comprising:
- any one of initiating a change of a polarization of the processors of the configuration according to a requested polarization change and rejecting the requested polarization change;
- and
- setting a condition code, by the processor, to a value indicating whether a polarization change is initiated or rejected.
A computer system comprising:
- a memory;
- and
- one or more processors (CPUs) in communication with said memory, wherein the computer system is configured to perform a method, the method comprising:
- executing, by a processor a perform topology function instruction for requesting a configuration change of a topology of a plurality of processors (CPUs) of a configuration, the executing comprising:
- any one of initiating a change of a polarization of the processors of the configuration according to a requested polarization change and rejecting the requested polarization change;
- and
- setting a condition code, by the processor, to a value indicating whether a polarization change is initiated or rejected.
A computer program product, the computer program product comprising a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
- executing, by a processor, a perform topology function instruction for requesting a configuration change of a topology of a plurality of processors (CPUs) of a configuration, the executing comprising:
- any one of initiating a change of a polarization of the processors of the configuration according to a requested polarization change and rejecting the requested polarization change;
- and
- setting a condition code, by the processor, to a value indicating whether a polarization change is initiated or rejected.
Dependencies are inferred from the claim text.