Far memory telemetry for hot and cold page management

A method for managing pages in memory comprising:

• receiving, by one or more telemetry processors, a page access request from the one or more computing processors, the one or more computing processors having near memory and being coupled to far memory;
• parsing, by the one or more telemetry processors, the page access request by:
• identifying a memory address associated with the requested page;
• identifying a page size of the requested page;
• determining a number of upper bits and lower bits of the memory address based on the page size;
• reducing the memory address into the upper bits and lower bits, wherein the lower bits are offset bits;
• and
• removing the offset bits from the memory address to generate a subset of bits that identify the requested page;
• querying, by the one or more telemetry processors, a directory using the subset of bits to determine that the directory contains a record associated with the requested page, the directory comprising a bitmap having a maximum number of bits corresponding to a capacity of the directory, the capacity of the directory corresponding to a capacity of records of pages capable of being maintained by the directory, wherein each bit or group of bits of the bitmap corresponds to different pages stored in the far memory, access counts for the different pages, and an access threshold indicating to transition a page from the far memory to the near memory;
• and
• in response to determining that the directory contains the record associated with the requested page, incrementing, by the one or more telemetry processors, an access count associated with the requested page.

A non-transitory computer readable medium storing instructions that, when executed by one or more telemetry processors, cause the one or more telemetry processors to perform a method for managing pages in memory, the method comprising:

• receiving a page access request from one or more computing processors, the one or more computing processors having near memory and being coupled to far memory;
• parsing the page access request by:
• identifying a memory address associated with the requested page;
• identifying a page size of the requested page;
• determining a number of upper bits and lower bits of the memory address based on the page size;
• reducing the memory address into the upper bits and lower bits, wherein the lower bits are offset bits;
• and
• removing the offset bits from the memory address to generate a subset of bits that identify the requested page;
• querying a directory using the subset of bits to determine that the directory contains a record associated with the requested page, the directory comprising a bitmap having a maximum number of bits corresponding to a capacity of the directory, the capacity of the directory corresponding to a capacity of records of pages capable of being maintained by the directory, wherein each bit or group of bits of the bitmap corresponds to different pages stored in the far memory, access counts for the different pages, and an access threshold indicating to transition a page from the far memory to the near memory;
• and
• in response to determining that the directory contains the record associated with the requested page, incrementing an access count associated with the requested page.