On RedHat 5.2/5.1 etc, swapon -s (to report swap
usage broken down by swap partition) just says
swapon: /proc/swaps: No such file or directory
I suspect that this functionality isn't supported
under the 2.0.* kernels, in which case that's about
all that can be done (maybe swapon should print a
better error message, though).
I have verified the error to occur when using 'swapon -s' on version
5.2 and later.
this will most likely not be fixed for 5.2.
The functionality works in 6.0.