From: Eric Wong <normalperson@...>
Date: 2014-08-30T06:41:50+00:00
Subject: [ruby-core:64670] Re: [ruby-cvs:54468] nobu:r47320 (trunk): benchmark.rb: prefer Process::CLOCK_MONOTONIC_RAW

nobu@ruby-lang.org wrote:
>     * lib/benchmark.rb (BENCHMARK_CLOCK): prefer Process::CLOCK_MONOTONIC_RAW
>       if available to more accurate measure.

We may want to trap Errno::EINVAL here because it's possible to build
with new headers and run on Linux < 2.6.28.

Or we tell users:
   new headers on an ancient, unmaintained kernel version is unsupported