Sched-ext Scheduler Contest FOSDEM’25

Writing custom Linux schedulers is pretty easy using sched-ext. You can write your own tiny scheduler in a few lines of code using C, Rust, or even Java. We’re so confident in sched-ext that we’re starting a Scheduler Contest for FOSDEM’25. Think you can craft the ultimate scheduler? A scheduler that does something interesting, helpful, or fun? Join our sched-ext contest and show us what you’ve got, with the chance of winning hand-crafted sched-ext swag!

How to participate:
Submit your scheduler using sched-ext as a pull request to the repository fosdem25, ensuring:

  • It runs with a 6.12 Linux kernel.
  • It’s GPLv2-licensed
  • It compiles and is understandable. We’re programming language agnostic; just make sure to include a script so we can build and run it.

The implementations.md document provides details on the submission format.

You can also submit a unique scheduling policy idea to ideas.md.

Try to surprise us…

Deadlines & Announcement:

The submission deadline is Sunday, 2 February, at 10:00 AM (CET).

Winners will be announced during Andrea Righi’s talk on the Kernel track, “Level Up Your Linux Gaming: How Sched-ext Can Save Your FPS,” from 12:30 to 13:10.

Prizes:

  • Best Scheduler: A sched-ext shirt and a cup!
  • Best Idea: A sched-ext shirt!

Important:

To claim your prize, you must be present during Andrea’s talk. By participating, you agree to share your submission under GPL licensing and allow us to showcase it.

Legal Note:
This contest is for fun! We, Andrea and Johannes, select the winners based on our personal preferences and our own definition of “best”. All decisions are final, and we’re not liable beyond delivering the prizes to the winners. If you have any questions, feel free to create a GitHub issue.

There will be multiple talks at FOSDEM’25 on sched-ext:

Come by and get yourself a sched-ext sticker and valuable information on this fascinating topic.

In the meantime, you can learn about sched-ext from the resources listed in the wiki and the videos in the sched-ext playlist on YouTube.

Author

  • Johannes Bechberger

    Johannes Bechberger is a JVM developer working on profilers and their underlying technology in the SapMachine team at SAP. This includes improvements to async-profiler and its ecosystem, a website to view the different JFR event types, and improvements to the FirefoxProfiler, making it usable in the Java world. He started at SAP in 2022 after two years of research studies at the KIT in the field of Java security analyses. His work today is comprised of many open-source contributions and his blog, where he writes regularly on in-depth profiling and debugging topics, and of working on his JEP Candidate 435 to add a new profiling API to the OpenJDK.

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