Date: Wed, 27 Apr 2011 22:40:23 +0200
From: Bruno =?UTF-8?B?UHLDqW1vbnQ=?= <bonbons@linux-vserver.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@elte.hu>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
        paulmck@linux.vnet.ibm.com, Mike Frysinger <vapier.adi@gmail.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        linux-fsdevel@vger.kernel.org,
        "Paul E. McKenney" <paul.mckenney@linaro.org>,
        Pekka Enberg <penberg@kernel.org>
Subject: Re: 2.6.39-rc4+: Kernel leaking memory during FS scanning,
 regression?
Message-ID: <20110427224023.10bd4f33@neptune.home>
In-Reply-To: <20110427204139.1b0ea23b@neptune.home>
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	<20110425203606.4e78246c@neptune.home>
	<20110425191607.GL2468@linux.vnet.ibm.com>
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	<20110426081904.0d2b1494@pluto.restena.lu>
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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)

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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