Not an expert here but I think there's a non trivial detail to your gist, which is that (user space) context switches can be faster than cache misses, and you c

Not an expert here but I think there's a non trivial detail to your gist, which is that (user space) context switches can be faster than cache misses, and you can design a scheduler that knows enough about its coroutines to switch to a new context with a low probability of a cache miss.