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

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Date:	Thu, 28 Apr 2011 08:22:29 +0200
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	paulmck@...ux.vnet.ibm.com
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, 27 Apr 2011 14:55:49 "Paul E. McKenney" wrote:
> On Wed, Apr 27, 2011 at 12:28:37AM +0200, Thomas Gleixner wrote:
> > On Tue, 26 Apr 2011, Linus Torvalds wrote:
> > > Normally SCHED_FIFO runs until it voluntarily gives up the CPU. That's
> > > kind of the point of SCHED_FIFO. Involuntary context switches happen
> > > when some higher-priority SCHED_FIFO process becomes runnable (irq
> > > handlers? You _do_ have CONFIG_IRQ_FORCED_THREADING=y in your config
> > > too), and maybe there is a bug in the runqueue handling for that case.
> > 
> > The forced irq threading is only effective when you add the command
> > line parameter "threadirqs". I don't see any irq threads in the ps
> > outputs, so that's not the problem.
> > 
> > Though the whole ps output is weird. There is only one thread/process
> > which accumulated CPU time
> > 
> > collectd  1605  0.6  0.7  49924  3748 ?        SNLsl 22:14   0:14
> 
> I believe that the above is the script that prints out the RCU debugfs
> information periodically.  Unless there is something else that begins
> with "collectd" instead of just collectdebugfs.sh.

No, collectd is a multi-threaded daemon that collects statistics of all
kinds, see  http://www.collectd.org/  for details (on my machine it
collects CPU usage, memory usage [just the basics], disk statistics,
network statistics load and a few more)

Bruno
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