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Message-ID: <4E25F009.1040309@hp.com>
Date: Tue, 19 Jul 2011 14:58:49 -0600
From: Terry Loftin <terry.loftin@...com>
To: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <peterz@...radead.org>
CC: Bob Montgomery <bob.montgomery@...com>
Subject: [PATCH 2/2] sched: Fix "divide error: 0000" in find_busiest_group
Add a check to sched_avg_update() to detect and reset age_stamp if the
clock value has wrapped. Because __cycles_2_ns() includes an offset
to account for start up time, the clock may not wrap to zero, so use
the current clock value instead.
Signed-off-by: Terry Loftin <terry.loftin@...com>
Signed-off-by: Bob Montgomery <bob.montgomery@...com>
---
diff --git a/kernel/sched.c b/kernel/sched.c
index 18d38e4..b39cae1 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1256,6 +1256,8 @@ static void sched_avg_update(struct rq *rq)
{
s64 period = sched_avg_period();
+ if (unlikely(rq->age_stamp > rq->clock))
+ rq->age_stamp = rq->clock;
while ((s64)(rq->clock - rq->age_stamp) > period) {
/*
* Inline assembly required to prevent the compiler
--
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