linux-kernel - Re: [git] CFS-devel, latest code

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Date:	Tue, 25 Sep 2007 13:33:06 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [git] CFS-devel, latest code


* Ingo Molnar <mingo@...e.hu> wrote:

> hm. perhaps this fixup in kernel/sched.c:set_task_cpu():
> 
>         p->se.vruntime -= old_rq->cfs.min_vruntime - new_rq->cfs.min_vruntime;
> 
> needs to become properly group-hierarchy aware?

a quick first stab like the one below does not appear to solve the 
problem.

	Ingo

------------------->
Subject: sched: group scheduler SMP migration fix
From: Ingo Molnar <mingo@...e.hu>

group scheduler SMP migration fix.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -1039,7 +1039,8 @@ void set_task_cpu(struct task_struct *p,
 {
 	int old_cpu = task_cpu(p);
 	struct rq *old_rq = cpu_rq(old_cpu), *new_rq = cpu_rq(new_cpu);
-	u64 clock_offset;
+	struct sched_entity *se;
+	u64 clock_offset, voffset;
 
 	clock_offset = old_rq->clock - new_rq->clock;
 
@@ -1051,7 +1052,11 @@ void set_task_cpu(struct task_struct *p,
 	if (p->se.block_start)
 		p->se.block_start -= clock_offset;
 #endif
-	p->se.vruntime -= old_rq->cfs.min_vruntime - new_rq->cfs.min_vruntime;
+
+	se = &p->se;
+	voffset = old_rq->cfs.min_vruntime - new_rq->cfs.min_vruntime;
+	for_each_sched_entity(se)
+		se->vruntime -= voffset;
 
 	__set_task_cpu(p, new_cpu);
 }
-
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