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

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Date:	Thu, 28 Apr 2011 20:49:42 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	sedat.dilek@...il.com
cc:	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Bruno Prémont <bonbons@...ux-vserver.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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>
Subject: Re: 2.6.39-rc4+: Kernel leaking memory during FS scanning,
 regression?

On Thu, 28 Apr 2011, Sedat Dilek wrote:
> On Thu, Apr 28, 2011 at 3:30 PM, Mike Galbraith <efault@....de> wrote:
> rt_rq[0]:
>   .rt_nr_running                 : 0
>   .rt_throttled                  : 0

>   .rt_time                       : 888.893877

>   .rt_time                       : 950.005460

So rt_time is constantly accumulated, but never decreased. The
decrease happens in the timer callback. Looks like the timer is not
running for whatever reason.

Can you add the following patch as well ?

Thanks,

	tglx

--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -172,7 +172,7 @@ static enum hrtimer_restart sched_rt_per
 		idle = do_sched_rt_period_timer(rt_b, overrun);
 	}
 
-	return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
+	return HRTIMER_RESTART;
 }
 
 static
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