Selective space reclamation of data storage memory employing heat and relocation metrics

A computer-implemented data storage memory system comprising:

• at least one data storage memory;
• and
• a processor configured to obtain instructions that cause the processor to perform a method for reclaiming space of said data storage memory, said method 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, said relocation metrics comprising 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;
• and
• performing at least one action selected from the group consisting of:
• (i) making said data whose utility metric fails a utility metric threshold, available for space reclamation and (ii) making said data whose utility metric meets or exceeds said utility metric threshold exempted from space reclamation.

A computer program product for reclaiming space of a data storage memory of a data storage memory system, said computer program product comprising a non-transitory computer-readable storage medium having program code embodied therein, said program code configured to cause a processor to perform a method 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, said relocation metrics comprising 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;
• and
• performing at least one action selected from the group consisting of:
• (i) making said data whose utility metric fails a utility metric threshold, available for space reclamation and (ii) making said data whose utility metric meets or exceeds said utility metric threshold exempted from space reclamation.