The kernel’s swapping code tends to not get much love. Users try to avoid
it, and developers often find better things to do with their time than
trying to improve it. At the 2023 Linux
Storage, Filesystem, Memory-Management and BPF Summit, though, Yosry
Ahmed dedicated a memory-management-track session to the problem of the
swap layer and what might be done to make it better.

Source: LWN.net – [$] Toward a swap abstraction layer