Processor exclusivity in a partitioned system

摘要

A computer system including a plurality of physical processors (CPs) having physical processor performances (PCPs), a plurality of logical processors (LCPs), a plurality of logical partitions (LPARs) where each partition includes one or more of the logical processors (LCPs), and a system assist processor having a control element. The control element controls the virtualization of the physical processors (CPs), the logical partitions (LPARs) and the logical processors (LCPs) and allocates the physical processor performances (PCPs) to the logical partitions (LPARs). The control element operates to exclusively bind logical processors (LCPs) to the physical processors (CPs). For a logical processor (LCP) exclusively bound to a physical processor (CP), the logical processor (LCP) has exclusive use of the underlying physical processor (CP) and no other logical processor (LCP) can be dispatched on the underlying physical processor (CP) even if the underlying physical processor (CP) is otherwise available.

主权项

1. A method comprising:
controlling, by a control element, virtualization of a plurality of physical processors, a plurality of logical processors, and a plurality of logical partitions each including one or more of the logical processors, said control element operating to exclusively bind logical processors of logical partitions to physical processors, and wherein based on utilization, dispcyc, of a logical partition of the plurality of logical partitions being between a minimum, dispmin, for the logical partition utilization and a target, disptgt, for the logical partition utilization, the control element: undispatching a dispatched logical processor of the logical partition from a physical processor, based on the logical processor being in a WAIT state; and dispatching an undispatched logical processor of the logical partition to a physical processor, based on the logical processor not being in a WAIT state.