[$] Better support for locally-attached-memory tiering

The term "memory tiering" refers to the management of memory placement onsystems with multiple types of memory, each of which has its ownperformance characteristics. On such systems, poor placement can lead tosignificantly worse performance. A memory-management-track discussion atthe 2024 Linux Storage,Filesystem, Memory Management, and BPF Summit took yet another look attiering challenges with a focus on upcoming technologies that may simplify(or complicate) the picture.