Power Controller, Processor and Method of Power Management

A method comprising:

• determining a power management performance impact associated with a resource entering a power managed state in response to receiving the request;
• and
• controlling the resource, in response to determining the power management performance impact, to transition from a first power state to a second power state according to a selected one of a first delay and a second delay in response to determining the power management performance impact.

A power controller comprising:

• a register to store information identifying at least one shared resource that is shared by more than one core of a plurality of cores;
• and
• a controller coupled to the register, the controller configured to receive a request to enter a power managed state from a resource, the controller to access the register to determine a sharing state of the resource in response to receiving the request and to control power state transitions of the resource that is accessible to a certain core of the plurality of cores, in response to determining the sharing state, using one of a first delay for the shared resource and a second delay for the non-shared resource.