Upstart task to scan for and activate any block devices with type swap; based on blkid.

automount-swaps.conf

# automount-swaps scans for any block devices with type swap (as
# identified by blkid) and activates them with swapon.
#

description	"Automount swap devices"

start on all-swaps  #generated by mountall

task

script
    logger -t automount-swaps "Starting automount-swaps."
    blkid -t TYPE=swap -o device | while read d; do
        if ! ( swapon -s | grep -q "$d" ); then
            printf "Activating %s\n" "$d" | logger -t automount-swaps
            swapon --fixpgsz $d
        fi
    done
end script