svn commit: r280286 - head/usr.sbin/powerd

[Alexander Motin]

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)
 {