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If I recall correctly there is also a possibility to set vm.swappiness level via sysctl program

To check current value of this option you can use following command:

sysctl -a | grep vm.swappiness

And with this command:

sysctl -w vm.swappiness=0

you can turn it off completely (system will not swap anymore). Setting this option value to 1 will allow swapping to disk only if RAM is exausted. To permanently save that option accross reboots you can define it in file in /etc/sysctl.d/ directory (/etc/sysctl.d/99-sysctl.conf for example).