> The high level overview is that it is stored in a shared page, mapped
> into each new process's memory space at start-up. The kernel is never
> entered; there are no context switches. The kernel has a timer that
> updates this page atomically.

i wonder if that is uniformly faster.  consider that
making reads of that page coherent enough on a
big multiprocessor and making sure there's not too
much interprocesser skew might be slower than a
system call.

- erik

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