From mboxrd@z Thu Jan  1 00:00:00 1970
From: reed@reedmedia.net (Jeremy C. Reed)
Date: Fri, 12 May 2017 15:40:03 -0500 (CDT)
Subject: [TUHS] The evolution of Unix facilities and architecture
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profil code somewhere in here?
https://github.com/weiss/original-bsd/commits/master/sys/kern/kern_clock.c?after=b44636d7febc9dcf553118bd320571864188351d+104

that has the sccs history back to April 1980 for src/sys/sys/clock.c