Read a bit through abstract and intro. Is this safe? It seems like bringing a lot of parts of services which normally are in user space to "quajects", which are in kernel-mode. Efficiency by giving up safety seems to be the underlying reasoning.
I only scanned this (was hoping there would be a conversation here, I'm guessing this isn't news to some people, but it was the first I've seen of it, would be great to know if it lives on in a modern form), but I didn't get the idea that they were gaining efficiency by giving up safety, they were gaining efficiency by having specialized code, so an interrupt handler might not need to save all the registers etc, because it's only going to stomp on one or two. And things like tweaking the function for queue add/remove when the queue gets full/empty. Not sure if it would be available with W^X, but that wasn't really a thing back then.
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