Re: [sched next] overflowed cpu time for kernel threads in/proc/PID/stat

[Sergey Senozhatsky]

On (08/20/13 17:42), Frederic Weisbecker wrote:
> 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.)

in cputime_adjust() `stime' is greater than `rtime', so `utime = rtime - stime'
sets wrong value.

	-ss
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