linux-kernel - [PATCH] sched: fix off-by-one bug in balance

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Message-ID: <49E54B2A.9060100@cn.fujitsu.com>
Date:	Wed, 15 Apr 2009 10:49:14 +0800
From:	Miao Xie <miaox@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] sched: fix off-by-one bug in balance_tasks()

If the load that need be moved equals the half weight of a task, I think
it is unnecessary to move this task. Or this task will be moved back and
forth.

Signed-off-by: Miao Xie <miaox@...fujitsu.com>
---
 kernel/sched.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 5724508..44926c8 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3085,7 +3085,7 @@ next:
 	if (!p || loops++ > sysctl_sched_nr_migrate)
 		goto out;
 
-	if ((p->se.load.weight >> 1) > rem_load_move ||
+	if ((p->se.load.weight >> 1) >= rem_load_move ||
 	    !can_migrate_task(p, busiest, this_cpu, sd, idle, &pinned)) {
 		p = iterator->next(iterator->arg);
 		goto next;
-- 
1.6.0.3


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