1. A method of migrating threads between a plurality of processors of a computing environment, said method comprising: monitoring, by a hardware controller of the computing environment, a plurality of processors to obtain information regarding a plurality of threads on the plurality of processors, the monitoring detecting a change in a state of a thread on a processor of the plurality of processors, the change in state indicating a change from an active state to a state other than the active state; determining, based on detecting the change in the state of the thread, whether at least one thread of the plurality of threads is to be migrated from at least one processor to at least one other processor to transform one or more processors of the plurality of processors from a multithreaded processing mode to a single thread processor mode, wherein the determining analyzes a plurality of factors including: types of threads executing on the plurality of processors, the types of threads including one or more of active, inactive, retiring, or entering inactive threads; and whether movement of the at least one thread transforms the one or more processors to single thread processor mode; and based on the determining, providing an indication by the hardware controller to an entity of the computing environment that the at least one thread is to be migrated from the at least one processor to the at least one other processor to enable at least one processor of the one or more processors to transform from a multithreading processor mode to a single thread processor mode.