[$] Modernizing swapping: introducing the swap table

The kernel's swap subsystem is a complex and often unloved beast. It isalso a critical component in the memory-management subsystem and has asignificant impact on the performance of the system as a whole. At the2025 Linux Storage, Filesystem, Memory-Management and BPF Summit, KairuiSong outlined a plan to simplify andoptimize the kernel's swap code. A first installmentof that work, written with help from Chris Li, was merged for the 6.18release. This article will catch up with the 6.18 work, setting the stagefor a future look at the changes that are yet to be merged.