linux-kernel - [patch] sched: add the other missing clock update to migrate

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Message-Id: <1258891879.14325.36.camel@marge.simson.net>
Date:	Sun, 22 Nov 2009 13:11:19 +0100
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [patch] sched: add the other missing clock update to migrate_task()


sched: add the other missing clock update to migrate_task()

When calling set_task_cpu(), we must update both runqueue clocks in order
to get an accurate clock offset.  Add it.


Signed-off-by: Mike Galbraith <efault@....de>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <new-submission>

---
 kernel/sched.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -2126,6 +2126,7 @@ migrate_task(struct task_struct *p, int
 	 */
 	if (!p->se.on_rq && !task_running(rq, p)) {
 		update_rq_clock(rq);
+		update_rq_clock(cpu_rq(dest_cpu));
 		set_task_cpu(p, dest_cpu);
 		return 0;
 	}


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