[$] CXL 1: Management and tiering

Compute ExpressLink (CXL) is an upcoming memory technology that is clearly on theminds of Linux memory-management developers; there were five sessionsdedicated to the topic at the 2022 Linux Storage,Filesystem, Memory-management and BPF Summit (LSFMM). The first threesessions, on May 3, covered various aspects of memory management in thepresence of CXL. It seems thatCXL may bring some welcome capabilities, especially for cloud-serviceproviders, but that will come at the cost of some headaches on thekernel-development side.