1. A method performed by a computer processor, said method comprising: monitoring a plurality of memory objects in a plurality of memory regions; wherein the plurality of memory regions are of a same memory device of a plurality of memory devices of a memory array; classifying at least some of said memory objects based on frequency of use; classifying at least some of said memory regions based on access frequency; operating each of said memory regions in one of at least two different power levels, one of said different power levels being a high power level and a different one of said different power levels being a low power level, and grouping said memory regions by said different power levels into a first grouping; allocating memory to a first memory object by: identifying a first memory region being within said high power level group; and placing said memory object in said first memory region; after allocating memory to the first memory object, selecting second memory objects of a second memory region for a queue; selecting second memory objects of the second memory region for relocation, wherein said selection for relocation is of the second memory objects selected for the queue; relocating a second memory object of the second memory objects selected for relocation to a memory region having a classification that corresponds to a value of a classification of said second memory object; ascertaining whether said second memory object is a last memory object of the second memory objects selected for relocation; repeating the relocating and ascertaining with respect to a next second memory object of the second memory objects selected for relocation until the last memory object of the second memory objects selected for relocation is relocated; in response to relocating the last memory object of the second memory objects selected for relocation, determining whether to re-assign a power level classification of the second memory region; and obtaining a second grouping that is different than the first grouping responsive to determining to re-assign the power level classification of the second memory region.