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)
{
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