1. A method for reclaiming space of a data storage memory of a data storage memory system, comprising: determining heat metrics of data stored in said data storage memory; determining relocation metrics related to relocation of said data within said data storage memory, wherein said relocation metrics comprise a count of the number of times said data has been relocated during reclamation process iterations; determining utility metrics of said data relating said heat metrics to said relocation metrics for said data; making said data whose utility metric fails a utility metric threshold, available for space reclamation; and exempting from space reclamation said data whose utility metric meets or exceeds said utility metric threshold.