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

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Date:	Thu, 28 Apr 2011 21:22:42 +0200
From:	Mike Galbraith <efault@....de>
To:	sedat.dilek@...il.com
Cc:	Thomas Gleixner <tglx@...utronix.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, 2011-04-28 at 17:28 +0200, Sedat Dilek wrote:

> OK, I tried with the patch proposed by Thomas (0003):

(thanks)

> patches/0001-Revert-rcu-restrict-TREE_RCU-to-SMP-builds-with-PREE.patch
> patches/0002-sched-Add-warning-when-RT-throttling-is-activated.patch
> patches/0003-sched-Remove-skip_clock_update-check.patch
> 
> >From the very beginning it looked as the system is "stable" due to:
> 
>   .rt_nr_running                 : 0
>   .rt_throttled                  : 0
> 
> This changed when I started a simple tar-job to save my kernel
> build-dir to an external USB-hdd.
> From...
> 
>   .rt_nr_running                 : 1
>   .rt_throttled                  : 1
> 
> ...To:
> 
>   .rt_nr_running                 : 2
>   .rt_throttled                  : 1
> 
> Unfortunately, reducing all activities to a minimum load, did not
> change from last known RT throttling state.
> 
> Just noticed rt_time exceeds the value of 950 first time here:

That would happen even if we did forced eviction.

> ----------------------------------------------------------------------------------------------------------
> R            cat  2652    115108.993460         1   120
> 115108.993460         1.147986         0.000000 /
> --
> rt_rq[0]:
>   .rt_nr_running                 : 1
>   .rt_throttled                  : 1
>   .rt_time                       : 950.005460
>   .rt_runtime                    : 950.000000
> ----------------------------------------------------------------------------------------------------------
>            rcuc0     7         0.000000     56869    98
> 0.000000       981.385605         0.000000 /
> --
> rt_rq[0]:
>   .rt_nr_running                 : 2
>   .rt_throttled                  : 1
>   .rt_time                       : 950.005460
>   .rt_runtime                    : 950.000000

Still getting stuck.  Eliminates the clock update optimization, but that
seemed unlikely anyway.  (I'll build a UP kernel and poke it)

	-Mike

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