Hot page detection by sampling tlb residency

A computing system comprising:

• a first memory tier;
• a second memory tier;
• and
• a processor coupled to the first memory tier and to the second memory tier, wherein the processor includes a sampling register and logic implemented at least partly in one or more of configurable or fixed-functionality hardware, the logic to:
• responsive to sequential read requests to the sampling register, read page data entries stored in successive locations in a translation lookaside buffer (TLB);
• and
• provide page data from the page data entries as sequential outputs of the sampling register.

A method comprising:

• generating a page residency list based on scanning, via a sampling register, page data entries stored in successive locations in a translation lookaside buffer (TLB);
• determining, for each page of a plurality of pages, whether the respective page is a hot page or a cold page based on the page residency list;
• and
• assigning hot pages to a first memory tier and cold pages to a second memory tier.