rdtscp vgettimeofday

[Andrea Arcangeli]

Hello,

As far as I can see, many changes happened but nobody has yet added
the rdtscp support to x86-64. rdtscp finally solves the problem and it
obsoletes hpet for timekeeping and it allows a fully userland
gettimeofday running at maximum speed in userland.

Before rdtscp we could never index the rdtsc offset in a proper index
without being in kernel with preemption disabled, so it could never
work reliably.

What's the status of the DSO API? Does it break backwards
compatibility or is the production glibc already capable of handling
that new kernel API?

I need rdtscp working on vsyscalls ASAP, but I should first understand
if I need to base my code on top of the vDSO patch or if to fork it
off in a dead branch to preserve backwards compatibility with current
glibc userland.

Thanks.
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