On: But how, exactly, do databases use mmap?

[jorangreef]

But that's a different order of magnitude problem: control plane vs data plane.

At some point, we could also say that the line fill buffer blocks our programs (more often than we realize).

All of this is accurate, but at different scales.

[PaulHoule → jorangreef]

Also many systems in 2021 have a lot of RAM and hardly ever swap.