One way to do it is to create a memory file system linked to a file on-disk.
In FreeBSD 5.0-RELEASE, to create a 128MB additional swap space, I've tried:
dd if=/dev/zero of=/swap0 count=128 bs=1m
chmod 600 /swap0
mdconfig -a -t vnode -f /swap0 -u 3
swapon /dev/md3
This will link the 128 megabyte file into swap space recognized by the system.
Execute "swapinfo" to confirm:
sandstone.north_ % swapinfo
Device 1K-blocks Used Avail Capacity Type
/dev/ad0s1b 524288 10136 514152 2% Interleaved
/dev/md3 131072 1876 129196 1% Interleaved
Total 655360 12012 643348 2%
sandstone.north_ %

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