"The Linux 2.6.23 kernel comes with a modular scheduler core and
a Completely Fair Scheduler (CFS), which is implemented as a
scheduling module. In this article, get acquainted with the major
features of the CFS, see how it works, and look ahead to some of
the expected changes for the 2.6.24 release.
"The scheduler in the 2.6.23 kernel paves the way for other
scheduling modules to work concurrently with the core. ('Modular'
in this case doesn't mean the scheduler is broken into loadable
modules, rather the code itself has become modular...)"