Sometimes wasting a partition for Linux Swap is quite annoying, so let's use a file instead.
Steps are simple:
cd /whatever-dir/ dd if=/dev/zero of=./swapfile bs=1024 count=<num in KB> mkswap ./swapfile swapon ./swapfile # That's it, you just enabled your swapfile
If you'd hope that it'll start at boot, add it to your
echo "/whatever-dir/swapfile none swap sw 0 0" >> /etc/fstab