Hi, I have ported NetBSD's tmpfs to OpenBSD. The port should be functional on i386 and amd64. I haven't tested on other architectures. There are limitations: update of mount options is not supported and the number of nodes in a tmpfs file system is limited by the number of anonymous UVM objects we can allocate.
Otherwise, give it a go. The diff can be found at: http://block.io/tmp/tmpfs.diff You will need a new kernel with option TMPFS enabled, fresh include files and mount_tmpfs. tmpfs is a better MFS, it is faster and can free unused memory. -p.
