Review request for JDK-8134150: Make Timing both threadsafe and efficient

[Attila Szegedi]

Please review JDK-8134150 "Make Timing both threadsafe and efficient" at 
<http://cr.openjdk.java.net/~attila/8134150/webrev.jdk9> for 
<https://bugs.openjdk.java.net/browse/JDK-8134150>

Thanks,
  Attila.