svn commit: r280752 - stable/9/usr.sbin/powerd

[Alexander Motin]

Author: mav
Date: Fri Mar 27 09:04:31 2015
New Revision: 280752
URL: https://svnweb.freebsd.org/changeset/base/280752

Log:
  MFC r280286: Add comment explaining existing powerd behavior on SMP systems.

Modified:
  stable/9/usr.sbin/powerd/powerd.c
Directory Properties:
  stable/9/   (props changed)
  stable/9/usr.sbin/   (props changed)
  stable/9/usr.sbin/powerd/   (props changed)

Modified: stable/9/usr.sbin/powerd/powerd.c
==============================================================================
--- stable/9/usr.sbin/powerd/powerd.c	Fri Mar 27 09:01:25 2015	(r280751)
+++ stable/9/usr.sbin/powerd/powerd.c	Fri Mar 27 09:04:31 2015	(r280752)
@@ -126,6 +126,12 @@ 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)
 {