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This is a really interesting approach. What are the main bottlenecks something like BaremetalOS solves? Context switches? Copying data forth and back userland? Something else?

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Extreme real-time control with total control over jitter etc. Not only fast response time but predictable.

Control over jitter would be less ideal for very tight deadlines due to branch prediction, cache misses, instruction counting, etc.

Yes?

Correct. BareMetal (the kernel) doesn't have context switching or userland. Think of the kernel as just a hardware abstraction layer.

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