Date: Tue, 20 Aug 2013 17:42:59 +0200
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>, Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Borislav Petkov <bp@alien8.de>, linux-kernel@vger.kernel.org
Subject: Re: [sched next] overflowed cpu time for kernel threads in
 /proc/PID/stat
Message-ID: <20130820154257.GD17441@somewhere>
References: <20130820111426.GA27828@swordfish.datadirectnet.com>
 <20130820151509.GA17441@somewhere>
 <20130820153549.GB2315@swordfish.minsk.epam.com>
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On Tue, Aug 20, 2013 at 06:35:50PM +0300, Sergey Senozhatsky wrote:
> On (08/20/13 17:15), Frederic Weisbecker wrote:
> > On Tue, Aug 20, 2013 at 02:14:26PM +0300, Sergey Senozhatsky wrote:
> > Hello,
> > 
> > Please upload your config.
> > 
> > I'm adding Stanislaw in Cc in case it relates to cputime scaling.
> >
> 
> please find attached.
> 
> 	-ss

> #
> # CPU/Task time and stats accounting
> #
> CONFIG_VIRT_CPU_ACCOUNTING=y
> CONFIG_VIRT_CPU_ACCOUNTING_GEN=y

So it happens with full dynticks cputime accounting.
How reproducable is this? Does it always happen?
Does it happen with CONFIG_TICK_CPU_ACCOUNTING as well? (you'll
need to deactivate full dynticks.)

Thanks.
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