The process to add 4G swap on your original swap:
1.Create a 4G swap file $ size="4G" && sudo fallocate -l $size /$size-swap && sudo mkswap /$size-swap && sudo swapon -p 20 /$size-swap 2.Make your swap permanent Add a line in your /etc/fstab file so that swap will be initialized on the next reboot. # in your /ets/fstab file /4G-swap none swap sw,pri=20 0 0 3.Reboot
Now your swap space will be original-swap + 4G.
Increase Swap Space in Ubuntu14.10
原文：http://www.cnblogs.com/bukekangli/p/4488943.html