aka relearning lessons of the past for the nth time. arguably. I mean, you can get big perf wins with tagged pointers - was it worth it?
(Oh, also it’s hard to get IPC as cheap as a function call when you have SMP…L4 usually has struggled with that)
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I don't know the history with SMP, but the basic model I imagine is: you don't send messages to a thread.
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Instead, the process you're calling borrows the current thread from the caller process.
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