I have seen this before ... the /tmp directory mounted on swap space. I am aware something similar can be done using tmpfs, but I don't think that what was being used. I too would like to mount /tmp onto my swap partition without using tmpfs but do not know how. My (layman's) understanding of tmpfs is that, by default, it uses half the RAM on your system. I also understand that I can be tweaked to use a greater or lesser amount. But can it be configured to use 0 (that is, zero) bytes of RAM but use only available swap partitions? I tried and it did not work for me. But then again, I know very little about this. Maybe some parameters were entered incorrectly. I like the idea of using swap for an OS temp dir but I do not want to allocate any RAM for this. Is this possible?