VDSO gettimeofday() x86_64 linux 3.2

[wilson self]

I noticed recently that my get time of day calls are quite a bit
slower than I would have expected; and it would see that a likely
cause is that they are not going via vdso, but rather a system call.

In older kernels there was kernel.vsyscall64 parameter to enable them,
but this seems to be gone in later kernel releases.  What config
option or parameter might I be missing that could cause gettimeofday()
to use the fallback methods?

Thanks
wilson
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