Re: [gentoo-user] Double mount entry?

[Paul Hartman <paul.hartman+gentoo@gmail.com>]

On Mon, May 16, 2011 at 6:45 AM, Pandu Poluan <pandu@poluan.info> wrote:
> What's rootfs?

/usr/src/linux/Documentation/filesystems/ramfs-rootfs-initramfs.txt

[snip]
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; rather than having special code
to check for and handle an empty list, it's smaller and simpler for the kernel
to just make sure certain lists can't become empty.

Most systems just mount another filesystem over rootfs and ignore it.  The
amount of space an empty instance of ramfs takes up is tiny.
[/snip]