The kernel's swap subsystem is a complex and often unloved beast. It is
also a critical component in the memory-management subsystem and has a significant impact on the performance of the system as a whole. At the
2025 Linux Storage, Filesystem, Memory-Management and BPF Summit, Kairui
Song outlined a plan to simplify and
optimize the kernel's swap code. A first installment
of that work, written with help from Chris Li, was merged for the 6.18
release. This article will catch up with the 6.18 work, setting the stage
for a future look at the changes that are yet to be merged.

https://lwn.net/Articles/1056405/
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