linux-kernel - Re: 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression?

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Message-ID: <alpine.LFD.2.02.1104281051090.19095@ionos>
Date:	Thu, 28 Apr 2011 11:09:18 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Mike Frysinger <vapier.adi@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	Pekka Enberg <penberg@...nel.org>,
	Mike Galbraith <efault@....de>
Subject: Re: 2.6.39-rc4+: Kernel leaking memory during FS scanning,
 regression?

Bruno,

On Thu, 28 Apr 2011, Thomas Gleixner wrote:
> On Wed, 27 Apr 2011, Bruno Prémont wrote:
> I need some sleep now, but I will try to come up with sensible
> debugging tomorrow unless Paul or someone else beats me to it.

can you please add the patch below and provide the /proc/sched_debug
output when the problem shows up again?

Thanks,

	tglx

---
 kernel/sched.c |    3 ---
 1 file changed, 3 deletions(-)

Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -642,9 +642,6 @@ static void update_rq_clock(struct rq *r
 {
 	s64 delta;
 
-	if (rq->skip_clock_update)
-		return;
-
 	delta = sched_clock_cpu(cpu_of(rq)) - rq->clock;
 	rq->clock += delta;
 	update_rq_clock_task(rq, delta);