Wrappers folly::chrono::clock_gettime and clock_gettime_ns
Summary: On Linux hosts, the fast path to get the current time in nanoseconds without doing a syscall to the kernel is available via the VDSO kernel-runtime interface. In this diff, I: 1. Expose portability wrappers `folly::chrono::clock_gettime()` and `folly::chrono::clock_gettime_ns()` 2. Implement a VDSO wrapper on Linux hosts to implement those without a round-trip to the kernel Depends On D3418054 Reviewed By: bmaurer Differential Revision: D3418087 fbshipit-source-id: 3fb99f0dd946f19ba29d0d52a1038dad3556bafd
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folly/ClockGettimeWrappers.h
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