From c92662082cee56dfc1bb40903ce598638c53474c Mon Sep 17 00:00:00 2001
From: Doug MacEachern <dougm@hyperic.com>
Date: Mon, 19 Jul 2004 18:36:17 +0000
Subject: [PATCH] add loadavg calculation notes

---
 src/os/aix/aix_sigar.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/os/aix/aix_sigar.c b/src/os/aix/aix_sigar.c
index 360451a4..1248409e 100644
--- a/src/os/aix/aix_sigar.c
+++ b/src/os/aix/aix_sigar.c
@@ -18,6 +18,7 @@
 #include <sys/user.h>
 #include <sys/utsname.h>
 #include <sys/vmount.h>
+#include <sys/proc.h>
 
 #include <sys/socket.h>
 #include <arpa/inet.h>
@@ -33,7 +34,17 @@
 
 #include <sys/ldr.h>
 
-#define FIXED_TO_DOUBLE(x) (((double)x) / 65536.0)
+/* not defined in aix 4.3 */
+#ifndef SBITS
+#define SBITS 16
+#endif
+
+/*
+ * from libperfstat.h:
+ * "To calculate the load average, divide the numbers by (1<<SBITS).
+ *  SBITS is defined in <sys/proc.h>."
+ */
+#define FIXED_TO_DOUBLE(x) (((double)x) / (1<<SBITS))
 
 /* these offsets wont change so just lookup them up during open */
 static int get_koffsets(sigar_t *sigar)