Linked by Peter Gerdes on Mon 10th Jan 2005 17:35 UTC
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JITs and VMs are system-level software. There's no getting around that. Application programmers have to rely on them doing their job accurately. Given the stability requirements for VMs, one has to assume that their code is very good and their bugs are few and far between. If so, why not push all of this code into the kernel? Eliminating user-mode entirely can speed up programs because all hardware accesses can be direct calls without the costly stack switch and access checks involved in a kernel-user transition.