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Zen Patched Kernel Sources.
Zen Kernel is a fork of Linux that applies out-of-tree features, early backports, and fixes, that impact desktop usage of Linux. Many of the features that change system behavior are hidden behind CONFIG_ZEN_INTERACTIVE, while many others are always available or configurable (such as CONFIG_MUQSS), for custom builds and distributions of Zen Kernel.
Source: LINUX Unplugged: 593: Zen and the Art of Kernel Preempting.