Memory Mapping and CXL Translation to Exploit Unused Remote Memory in a Multi-Host System

A method for utilizing underutilized-allocated-DRAM, comprising:

• receiving, by a resource composer from a kernel module running on a first host, values of page table and process control block of a first process (P1) running in a first packaged computing environment (PCE1) on the first host;
• determining, by the resource composer based on the values, that the P1 has not been using, for a certain duration, a portion of P1 address space mapped to certain page frames pointing to DRAM on the first host;
• mapping, by the resource composer, the certain page frames to address space of a second process (P2) that runs in a second packaged computing environment (PCE2) on a second host;
• utilizing, by the resource composer, Compute Express Link (CXL) CXL.mem commands to communicate with the PCE2;
• and
• translating, by the resource composer based on the mapping, the CXL.mem commands to CXL.cache or CXL.io commands suitable for accessing the certain page frames.

A non-transitory computer readable medium storing data comprising instructions configured to cause a computer to execute steps comprising:

• receiving, by a resource composer from a kernel module running on a first host, values of page table and process control block of a first process (P1) running in a first packaged computing environment (PCE1) on the first host;
• determining, by the resource composer based on the values, that the P1 has not been using, for a certain duration, a portion of P1 address space mapped to certain page frames pointing to DRAM on the first host;
• mapping, by the resource composer, the certain page frames to address space of a second process (P2) that runs in a second packaged computing environment (PCE2) on a second host;
• utilizing, by the resource composer, Compute Express Link (CXL) CXL.mem commands to communicate with the PCE2;
• and
• translating, by the resource composer based on the mapping, the CXL.mem commands to CXL.cache or CXL.io commands suitable for accessing the certain page frames.