From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Frederic Weisbecker <fweisbec@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
Date: Sat, 31 Aug 2013 22:01:17 +0300 [thread overview]
Message-ID: <20130831190117.GA2213@swordfish> (raw)
In-Reply-To: <20130830230402.GA14760@somewhere>
On (08/31/13 01:04), Frederic Weisbecker wrote:
> But stime should always be below rtime due to the calculation done by scale_stime()
> which roughly sums up to:
>
> stime = (stime / stime + utime) * rtime
>
> So this shouldn't happen.
>
> I couldn't manage to reproduce it though. Can you still trigger it with latest -next?
>
> Thanks.
Hello,
I can't pull current -next (away from good network connection for a
couple of days). What I have is 3.11.0-rc7-next-20130829:
ps aux | grep rcu
root 8 0.0 0.0 0 0 ? S Aug30 0:00 [rcuc/0]
root 9 0.0 0.0 0 0 ? S Aug30 0:00 [rcub/0]
root 10 21376376 0.0 0 0 ? S Aug30 21114581:36 [rcu_preempt]
root 11 21376376 0.0 0 0 ? S Aug30 21114581:35 [rcuop/0]
root 12 21376376 0.0 0 0 ? S Aug30 21114581:35 [rcuop/1]
cat /proc/10/stat
10 (rcu_preempt) S 2 0 0 0 -1 2129984 0 0 0 0 1844674407370 715 0 0 20 0 1 0 10 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 18446744073709551615 0 0 17 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-ss
next prev parent reply other threads:[~2013-08-31 19:02 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-20 11:14 [sched next] overflowed cpu time for kernel threads in /proc/PID/stat Sergey Senozhatsky
2013-08-20 15:15 ` Frederic Weisbecker
2013-08-20 15:35 ` Sergey Senozhatsky
2013-08-20 15:42 ` Frederic Weisbecker
2013-08-20 15:53 ` Sergey Senozhatsky
2013-08-20 18:48 ` Sergey Senozhatsky
2013-08-21 15:39 ` Sergey Senozhatsky
2013-08-30 23:04 ` Frederic Weisbecker
2013-08-31 19:01 ` Sergey Senozhatsky [this message]
2013-09-08 10:56 ` Frederic Weisbecker
2013-09-08 10:59 ` Frederic Weisbecker
2013-09-02 12:28 ` Sergey Senozhatsky
2013-09-02 13:07 ` Frederic Weisbecker
2013-09-02 13:39 ` Sergey Senozhatsky
2013-09-02 13:50 ` Stanislaw Gruszka
2013-09-02 14:00 ` Sergey Senozhatsky
2013-09-03 8:43 ` Stanislaw Gruszka
2013-09-03 9:33 ` Sergey Senozhatsky
2013-09-03 13:15 ` Sergey Senozhatsky
2013-09-03 18:09 ` Sergey Senozhatsky
2013-09-03 18:32 ` Ingo Molnar
2013-09-04 12:08 ` [PATCH -tip] sched/cputime: do not scale when utime == 0 Stanislaw Gruszka
2013-09-04 12:33 ` Ingo Molnar
2013-09-04 13:16 ` [PATCH -tip v2] " Stanislaw Gruszka
2013-09-04 14:31 ` Ingo Molnar
2013-09-04 14:37 ` [tip:timers/urgent] sched/cputime: Do " tip-bot for Stanislaw Gruszka
2013-09-04 15:35 ` Frederic Weisbecker
2013-09-02 14:13 ` [sched next] overflowed cpu time for kernel threads in /proc/PID/stat Frederic Weisbecker
2013-09-02 14:24 ` Sergey Senozhatsky
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