[$] A new swap abstraction layer for the kernel

Swapping may be a memory-management technique at its core, but itsimplementation also involves the kernel's filesystem and storage layers.So it is not surprising that a session on the kernel's swap abstractionlayer, led by Chris Li at the 2024 Linux Storage,Filesystem, Memory-Management and BPF Summit, was held jointly by allthree of those tracks. Li has some ambitious ideas for an improvedsubsystem, but getting to a workable implementation may not be easy.