Já existe uma boa resposta em um comentário Volker Siegel relacionado a tmpfs
:
It means there are three tmpfs file systems mounted into three directories. That has nothing to do with which swap files exist.
Eu posso adicionar uma referência explicando o rootfs
issue.
ramfs, rootfs and initramfs October 17, 2005 Rob Landley ============================= ... What is rootfs? --------------- Rootfs is a special instance of ramfs (or tmpfs, if that's enabled), which is always present in 2.6 systems. You can't unmount rootfs for approximately the same reason you can't kill the init process; ... Most systems just mount another filesystem over rootfs and ignore it. The amount of space an empty instance of ramfs takes up is tiny. ...
Dê uma olhada no "O que é o initramfs?" seção no mesmo documento para obter algumas informações sobre como o sistema usa rootfs
.