This directory contains the repo's schedulers.
Some of these schedulers are simply examples of different types of schedulers
that can be built using sched_ext. They can be loaded and used to schedule on
your system, but their primary purpose is to illustrate how various features of
sched_ext can be used.
Other schedulers are actually performant, production-ready schedulers. That is, for the correct workload and with the correct tuning, they may be deployed in a production environment with acceptable or possibly even improved performance. Some of the examples could be improved to become production schedulers.
Please see the following README files for details on each of the various types
of schedulers:
rustdescribes all of the schedulers withRustuser space components.
This directory previously also held C schedulers for illustration purposes. These
schedulers are now found only in the Linux kernel repository in
tools/sched_ext.
Each C scheduler's purpose was to demonstrate a single technique for development,
often BPF-related. The C schedulers were kept synced between upstream and this
repository.
As the ecosystem has matured these schedulers have been superseded by those in the
rust/ directory, many of which are production-ready. These schedulers better represent
modern sched_ext codebases and are a more appropriate starting point for newcomers.
The build system and surrouding crates ecosystem is also geared towards Rust schedulers.
As a result, the C schedulers are no longer mirrored here. They are available
from the kernel/tools/sched_ext, and also in the dedicated
scx-c-examples repository for
those who want to explore or experiment with C-based schedulers.