I am unsure whether Linux 5.x uses segmentation or paging, or both in regards to memory?

Wonder if this is interesting? https://chrisdown.name/2018/01/02/in...e-of-swap.html

The x86-64 architecture does not use segmentation in long mode (64-bit mode). When you see "Segmentation Fault 11" or whatnot if you are developing userspace C(++) code, it's referring to paging.

If you want to get --pedantic, it's still possible in long mode with some trickery to get them to kind of work.

According to a Unix Stack Exchange answer,

So, in your everyday life, you can probably just forget about segmentation in the Linux kernel.

Linux uses paging but misnames it as swapping. The original method of extended memory circa 1970 was done only with software and was called swapping. Then a better method which uses both hardware and software functions was developed and called paging. During the time that both swapping and paging existed the open source movement developed a paging method and misnamed it swapping. Linux misnames its paging partition as a swapping partition.

Handling segmentation and page faults are part of the paging algorithm and are handled by a combination of kernel code and hardware.