This option enables a new scheduler class sched_ext (SCX), which
allows scheduling policies to be implemented as BPF programs to
achieve the following:

- Ease of experimentation and exploration: Enabling rapid
iteration of new scheduling policies.
- Customization: Building application-specific schedulers which
implement policies that are not applicable to general-purpose
schedulers.
- Rapid scheduler deployments: Non-disruptive swap outs of
scheduling policies in production environments.

sched_ext leverages BPF struct_ops feature to define a structure
which exports function callbacks and flags to BPF programs that
wish to implement scheduling policies. The struct_ops structure
exported by sched_ext is struct sched_ext_ops, and is conceptually
similar to struct sched_class.

For more information:
Documentation/scheduler/sched-ext.rst
https://github.com/sched-ext/scx