A New Task For Mac OS X - Exokernels
"An exokernel, however, hands off control to an application if it needs it, and doesn't give power to processes that shouldn't have it. If all elements of the system that normally slow operations down, like virtual memory, and the filesystem, are stored as application libraries, then programs can access them directly without bothering the kernel with otherwise unnecessary system calls. Thus, instead of assuming that every and all requests need to be processed through every level of the system's hierarchy, an application can opt to use the most efficient route.
(Submitted by Noel Wed Jun 9, 2004 )
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