PREEMPT_RT real-time Linux development (early 2000s–2024)
Ingo Molnar and a community of developers built PREEMPT_RT patches to give Linux real-time response guarantees, a hard requirement for industrial and automotive safety systems. The patches developed in parallel with the mainline kernel for nearly two decades.
The work merged into the mainline kernel with Linux 6.12 in November 2024, making real-time capabilities standard Linux rather than a separate fork.
It demonstrated that safety-critical requirements can be integrated into open source through sustained community effort, setting a precedent for how safety needs get upstreamed.
Like PREEMPT_RT, Cregit and stress-ng address safety-critical needs as open-source projects. Their success depends on the same dynamic: whether the broader community adopts and integrates them.
