From b9ce898c6f61203b4987c4e983acef9162cbc323 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Thu, 10 Oct 2002 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2002-10-10

---
 pc/main.c   | 1 +
 port/proc.c | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/pc/main.c b/pc/main.c
index 821bc870dc9decf037806bc54f406e4f2335e00a..ae91dcf52f3793fb9188e9230b4fb816fda11701 100644
--- a/pc/main.c
+++ b/pc/main.c
@@ -140,6 +140,7 @@ machinit(void)
 	m->machno = machno;
 	m->pdb = pdb;
 	m->gdt = gdt;
+	m->perf.period = 1;
 
 	/*
 	 * For polled uart output at boot, need
diff --git a/port/proc.c b/port/proc.c
index 93ee7fa139a80ade0bfea4d1287db225ca34f90d..c45a53238ddb8a06c7cb43cdf1cf5996b02cb777 100644
--- a/port/proc.c
+++ b/port/proc.c
@@ -1251,9 +1251,9 @@ accounttime(void)
 	n = perfticks();
 	per = n - m->perf.last;
 	m->perf.last = n;
-	if(per == 0)
-		per = 1;
-	m->perf.period = (m->perf.period*(HZ-1)+per)/HZ;
+	per = (m->perf.period*(HZ-1) + per)/HZ;
+	if(per != 0)
+		m->perf.period = per;
 
 	m->perf.avg_inidle = (m->perf.avg_inidle*(HZ-1)+m->perf.inidle)/HZ;
 	m->perf.inidle = 0;