On Wed, May 08, 2013 at 04:56:33PM -0400, Dave Jones wrote:
> On Wed, May 08, 2013 at 01:52:58PM -0700, Paul E. McKenney wrote:
> > On Wed, May 08, 2013 at 04:30:42PM -0400, Dave Jones wrote:
>
> > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > > 10 root 20 0 0 0 0 S 200.0 0.0 185301:36 rcu_preempt
> > > 553 root 20 0 268m 76m 6764 S 200.0 2.6 144579:53 Xorg
> > > 1199 root 20 0 0 0 0 S 200.0 0.0 306:17.85 kworker/1:0
> > > 501 root 20 0 0 0 0 S 200.0 0.0 4471:03 kworker/0:2
> > > 12 root 20 0 0 0 0 S 200.0 0.0 67277:16 rcuop/1
> > > 1237 davej 20 0 535m 15m 8484 S 200.0 0.5 3645:16 Terminal
> > > 859 davej 20 0 117m 3036 1336 S 200.0 0.1 1986:55 htop
> > >
> > > There are a lot of processes allegedly using "200%" of CPU time, a
> handful
> > > in the "196%" range, and then a bunch at 0.
> >
> > Yow!!! 185301 minutes is 128 days, which is a truly impressive amount of
> > CPU time to accumulate in a few short hours.
>
> perf top doesn't show anything out of the ordinary. Just as an idle desktop
> should behave, it's spending a bunch of time in delay_tsc.
>
> > This is 3.9, or Linus's current tree? I am guessing the latter, but
> > figured I should ask.
>
> Yeah, the latter. (v3.9-11572-g5af43c2)
Do you have CONFIG_NO_HZ_FULL=y? We just might have a bug in tickless
CPU-time accounting...
Thanx, Paul
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