This is an example of the directory layout for the chroot/proc directory of a SELinux UML instance.
/proc/mm can be mounted if the host supports it using a bind mount: mount --bind /proc/mm ./proc/mm.
This allows the guest to run in skas3 mode (which is much faster than the default), but may have security implications.
When using hppfs (not currently available for 2.6), this directory can be populated with files that will override the default /proc.

drwxr-xr-x   3 root root   .
drwxr-xr-x  12 root root   ..
--w--w--w-   1 root root   mm