From 991000dd70beff287322a3f6113f7f73a9d237d6 Mon Sep 17 00:00:00 2001
From: Ben Gras <ben@minix3.org>
Date: Thu, 11 Dec 2008 14:37:18 +0000
Subject: [PATCH] dynamic HZ

---
 lib/posix/getloadavg.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/posix/getloadavg.c b/lib/posix/getloadavg.c
index 82fceba1c..adca7d847 100755
--- a/lib/posix/getloadavg.c
+++ b/lib/posix/getloadavg.c
@@ -9,16 +9,25 @@
 int getloadavg(double *loadavg, int nelem)
 {
   struct loadinfo loadinfo;
+  static u32_t system_hz = 0;
   int h, p, unfilled_ticks;
 #define PERIODS 3
   int minutes[3] = { 1, 5, 15 };
   size_t loadsize;
   ssize_t l;
+
   if(nelem < 1) {
 	errno = ENOSPC;
 	return -1;
   }
 
+  if(system_hz == 0) {
+  	if((getsysinfo_up(PM_PROC_NR, SIU_SYSTEMHZ,
+	  sizeof(system_hz), &system_hz)) < 0) {
+		system_hz = DEFAULT_HZ;
+	}
+  }
+
   loadsize = sizeof(loadinfo);
   if((l=getsysinfo_up(PM_PROC_NR, SIU_LOADINFO, loadsize, &loadinfo)) < 0)
 	return -1;
@@ -28,7 +37,7 @@ int getloadavg(double *loadavg, int nelem)
 	nelem = PERIODS;
 
   /* How many ticks are missing from the newest-filled slot? */
-#define TICKSPERSLOT (_LOAD_UNIT_SECS * sys_hz())
+#define TICKSPERSLOT (_LOAD_UNIT_SECS * system_hz)
   unfilled_ticks = TICKSPERSLOT - (loadinfo.last_clock % TICKSPERSLOT);
 
   for(p = 0; p < nelem; p++) {