Someone should write a library that uses seccomp-bpf to intercept blocking syscalls and route them to a user-mode scheduler on Linux…
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I guess 180ns ≃ 500 cycles is achievable for syscalls without much work to do, and ~3x that might be plausible for round trips.
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To be clear, this is an awful hack, and I don’t love M:N, but IMHO if you’re going to do it you should make it compatible with existing code
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