Executing 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 quest CPUs, the polarization related to the amount of a host CPU resource is provided to a guest CPU.
Claims20
A computer program product for requesting a configuration change of a topology of a plurality of first processors (CPUs) of a first configuration, 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 a perform topology function instruction for requesting a polarization change, the execution comprising:
- any one of initiating a change of the polarization of the processors of the guest configuration according to the requested polarization change or rejecting the polarization change request;
- and
- setting a condition code to a value indicating whether a polarization change is initiated or rejected, wherein the condition code of an instruction set architecture provides branching criterion for branch on condition instructions.
A computer system comprising:
- a memory;
- and
- a computer system comprising processors (CPUs) in communication with said memory, wherein the computer system is configured to perform a method for requesting a configuration change of a topology of a plurality of first processors (CPUs) of a first configuration, the method comprising:
- executing a perform topology function instruction for requesting a polarization change, the execution comprising:
- any one of initiating a change of the polarization of the processors of the guest configuration according to the requested polarization change or rejecting the polarization change request;
- and
- setting a condition code to a value indicating whether a polarization change is initiated or rejected, wherein the condition code of an instruction set architecture provides branching criterion for branch on condition instructions.
A computer implemented method for requesting a configuration change of a topology of a plurality of first processors (CPUs) of a first configuration, the method comprising:
- executing a perform topology function instruction for requesting a polarization change, the execution comprising:
- any one of initiating a change of the polarization of the processors of the guest configuration according to the requested polarization change or rejecting the polarization change request;
- and
- setting a condition code to a value indicating whether a polarization change is initiated or rejected, wherein the condition code of an instruction set architecture provides branching criterion for branch on condition instructions.
Dependencies are inferred from the claim text.