s6-linux-utils
Software
skarnet.org
 The s6-swapon program 
s6-swapon activates swap partitions.
 Interface 
     s6-swapon [ -a | device ]
 -  s6-swapon activates the swap on device. 
-  If the -a option is given instead of device,
s6-swapon looks for partitions marked swap in
/etc/fstab and activates them all.