Feral's "GameMode" has been updated to version 1.8. This update adds support for CPU core pinning and parking; fixes some bugs; and more. GameMode is a daemon/libGameMode that helps optimise Linux system performance for gaming. You can find GameMode in various distro repos and on Github. It is licensed using the BSD-3-Clause license.
The source code can be found on Github:
https://github.com/FeralInteractive/gamemode
The release notes for this update are here:
https://github.com/FeralInteractive/gamemode/releases/tag/1.8