joyent/libuv — pull request #975 by bnoordhuis (2013-10-29 22:07:45+00:00)
Title: linux: use CLOCK_MONOTONIC_COARSE if available

clock_gettime(CLOCK_MONOTONIC_COARSE) eliminates the SYS_clock_gettime
system call entirely. It just reads from the vDSO timestamp, which is
the kernel's idea of "now" and is good enough for our purposes.

Suggested reviewer: @indutny