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

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Date:	Wed, 27 Apr 2011 15:07:17 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	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>,
	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 Wed, Apr 27, 2011 at 10:40:23PM +0200, Bruno Prémont wrote:
> On Wed, 27 April 2011 Bruno Prémont wrote:
> > On Wed, 27 April 2011 Bruno Prémont wrote:
> > > On Wed, 27 Apr 2011 00:28:37 +0200 (CEST) Thomas Gleixner wrote:
> > > > Also please apply the patch below and check, whether the printk shows
> > > > up in your dmesg.
> > > 
> > > > Index: linux-2.6-tip/kernel/sched_rt.c
> > > > ===================================================================
> > > > --- linux-2.6-tip.orig/kernel/sched_rt.c
> > > > +++ linux-2.6-tip/kernel/sched_rt.c
> > > > @@ -609,6 +609,7 @@ static int sched_rt_runtime_exceeded(str
> > > >  
> > > >  	if (rt_rq->rt_time > runtime) {
> > > >  		rt_rq->rt_throttled = 1;
> > > > +		printk_once(KERN_WARNING "sched: RT throttling activated\n");
> > 
> > This gun is triggering right before RCU-managed slabs start piling up as
> > visible under slabtop so chances are it's at least a related!
> 
> Letting the machine idle (except running collectd and slabtop) scheduler
> suddenly decided to restart giving rcu_kthread CPU cycles (after two hours
> or so! if I read my statistics graphs correctly)

And this also returned the slab memory, right?

Two hours is quite some time...

							Thanx, Paul

> While looking at lkml during the above 2 hours I stumbled across this (the
> patch of which doesn't help in my case) which looked possibly related.
>   http://thread.gmane.org/gmane.linux.kernel/1129614
> 
> Bruno
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