In knew that Linux is a funny thing, but that its kernel is humorous was new to me today when I entered the following command into the command prompt:

lenny:/# cat /proc/swaps
Filename                                Type            Size    Used    Priority
/dev/null                               partition       1048576 3440    -1

Swapping out main memory pages into /dev/null might be performed very efficiently, however, I doubt that reading them back will be as easy.

The solution to this miracle is very short: The funny linux kernel is running in a virtual machine environment. The swap partition is out of its domain and thus it does not know how to reference to it.