Technology For Managing Memory Tags

At least one non-transitory machine-accessible medium comprising computer instructions for supporting sub-page granular memory tags, wherein the computer instructions, in response to being executed on a data processing system, enable the data processing system to:

• use a memory tag value supplied as part of a memory address to specify protection for data stored at a location within a page of data in random access memory (RAM) of the data processing system, wherein the location is based on a location value supplied as another part of the memory address, wherein the RAM is responsive to a memory controller in the data processing system, and wherein a memory protection module in the memory controller enables the memory controller to protect the data in RAM, based on the memory tag value;
• and
• swap the page of data out of the RAM to non-volatile storage (NVS) of the data processing system by using a memory tag map (MTM) to apply memory tag values to respective subpages within the page being swapped out.

A method for managing sub-page granular memory tags in a data processing system, the method comprising:

• in connection with swapping a page of data out of random access memory (RAM) in the data processing system to non-volatile storage (NVS) in the data processing system, using a memory tag map (MTM) to apply memory tag values to respective subpages within the page being swapped out;
• and
• in connection with swapping the page of data from NVS back in to RAM, applying memory tag values to respective subpages within the page being swapped back in to RAM.