> Rust's tasks are often called lightweight but at least on Linux the only optimization is the lack of preemption. I'm surprised by this, I would have expected

> Rust's tasks are often called lightweight but at least on Linux the only optimization is the lack of preemption. I'm surprised by this, I would have expected that voluntary preemption saves you from having to save the FP registers as well. Is the absence of the optimization a non-x86 thing?