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From: Alexander Motin <mav@FreeBSD.org>
Date: Fri, 20 Mar 2015 15:07:06 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r280286 - head/usr.sbin/powerd
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Author: mav
Date: Fri Mar 20 15:07:05 2015
New Revision: 280286
URL: https://svnweb.freebsd.org/changeset/base/280286

Log:
  Add comment explaining existing powerd behavior on SMP systems.
  
  MFC after:	1 week

Modified:
  head/usr.sbin/powerd/powerd.c

Modified: head/usr.sbin/powerd/powerd.c
==============================================================================
--- head/usr.sbin/powerd/powerd.c	Fri Mar 20 14:25:51 2015	(r280285)
+++ head/usr.sbin/powerd/powerd.c	Fri Mar 20 15:07:05 2015	(r280286)
@@ -127,6 +127,12 @@ static int	devd_pipe = -1;
 #define DEVD_RETRY_INTERVAL 60 /* seconds */
 static struct timeval tried_devd;
 
+/*
+ * This function returns summary load of all CPUs.  It was made so
+ * intentionally to not reduce performance in scenarios when several
+ * threads are processing requests as a pipeline -- running one at
+ * a time on different CPUs and waiting for each other.
+ */
 static int
 read_usage_times(int *load)
 {