From: Linus Torvalds <torvalds@linux-foundation.org>
To: sedat.dilek@gmail.com
Cc: "Mike Galbraith" <efault@gmx.de>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
"Bruno Prémont" <bonbons@linux-vserver.org>,
"Ingo Molnar" <mingo@elte.hu>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
"Mike Frysinger" <vapier.adi@gmail.com>,
"KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
"Paul E. McKenney" <paul.mckenney@linaro.org>,
"Pekka Enberg" <penberg@kernel.org>
Subject: Re: 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression?
Date: Thu, 28 Apr 2011 08:48:39 -0700 [thread overview]
Message-ID: <BANLkTi=-D80vqazya6aHfV0841SBkNPsSQ@mail.gmail.com> (raw)
In-Reply-To: <BANLkTik4+PAGHF-9KREYk8y+KDQLDAp2Mg@mail.gmail.com>
On Thu, Apr 28, 2011 at 8:28 AM, Sedat Dilek <sedat.dilek@googlemail.com> wrote:
>
> From the very beginning it looked as the system is "stable" due to:
Actually, look here, right from the beginning that log is showing
total breakage:
Thu Apr 28 16:49:51 CEST 2011
.rt_time : 233.923773
Thu Apr 28 16:50:06 CEST 2011
.rt_time : 259.446506
Thu Apr 28 16:50:22 CEST 2011
.rt_time : 273.110840
Thu Apr 28 16:50:37 CEST 2011
.rt_time : 282.713537
Thu Apr 28 16:50:52 CEST 2011
.rt_time : 288.136013
Thu Apr 28 16:51:07 CEST 2011
.rt_time : 293.057088
..
Thu Apr 28 16:58:29 CEST 2011
.rt_time : 888.893877
Thu Apr 28 16:58:44 CEST 2011
.rt_time : 950.005460
iow, rt_time just constantly grows. You have that "sleep 15" between
every log entry, so rt_time growing by 10-100 ms every 15 seconds
obviously does mean that it's using real CPU time, but it's still well
in the "much less than 1% CPU" range. So the rcu thread is clearly
doing work, but equally clearly it should NOT be throttled.
But since it is constantly growing, at some point it _will_ hit that
magical "950ms total time used", and then it gets throttled. For no
good reason.
It shouldn't have been throttled in the first place, and then the
other bug - that it isn't apparently ever unthrottled - just makes it
not work at all.
So that whole throttling is totally broken.
Linus
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next prev parent reply other threads:[~2011-04-28 15:55 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-24 18:21 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression? Bruno Prémont
2011-04-24 21:59 ` Bruno Prémont
2011-04-25 2:42 ` KOSAKI Motohiro
2011-04-25 7:47 ` Mike Frysinger
2011-04-25 9:17 ` Bruno Prémont
2011-04-25 9:25 ` Pekka Enberg
2011-04-25 10:34 ` Bruno Prémont
2011-04-25 11:41 ` Bruno Prémont
2011-04-25 11:47 ` Pekka Enberg
2011-04-25 12:11 ` Bruno Prémont
2011-04-25 12:14 ` Tetsuo Handa
2011-04-25 12:21 ` Tetsuo Handa
2011-04-25 15:22 ` Linus Torvalds
2011-04-25 16:04 ` Bruno Prémont
2011-04-25 16:31 ` Linus Torvalds
2011-04-25 17:00 ` Bruno Prémont
2011-04-25 17:10 ` Linus Torvalds
2011-04-25 17:20 ` Linus Torvalds
2011-04-25 18:36 ` Bruno Prémont
2011-04-25 19:16 ` Paul E. McKenney
2011-04-25 21:10 ` Bruno Prémont
2011-04-25 21:26 ` Paul E. McKenney
2011-04-25 21:30 ` Linus Torvalds
2011-04-25 21:49 ` Paul E. McKenney
2011-04-26 6:19 ` Bruno Prémont
2011-04-26 11:27 ` Paul E. McKenney
2011-04-26 16:38 ` Bruno Prémont
2011-04-26 17:09 ` Bruno Prémont
2011-04-26 17:18 ` Linus Torvalds
2011-04-26 22:28 ` Thomas Gleixner
2011-04-27 6:15 ` Bruno Prémont
2011-04-27 18:41 ` Bruno Prémont
2011-04-27 19:16 ` Pádraig Brady
2011-04-27 19:34 ` Bruno Prémont
2011-04-27 22:05 ` Paul E. McKenney
2011-04-27 20:40 ` Bruno Prémont
2011-04-27 22:07 ` Paul E. McKenney
2011-04-28 6:10 ` Bruno Prémont
2011-04-27 22:06 ` Thomas Gleixner
2011-04-27 22:27 ` Paul E. McKenney
2011-04-27 22:32 ` Thomas Gleixner
2011-04-27 22:59 ` Paul E. McKenney
2011-04-27 23:28 ` Linus Torvalds
2011-04-27 23:46 ` Linus Torvalds
2011-04-28 9:09 ` Thomas Gleixner
2011-04-28 9:17 ` Sedat Dilek
2011-04-28 9:40 ` Thomas Gleixner
2011-04-28 10:12 ` Mike Galbraith
2011-04-28 9:45 ` Sedat Dilek
2011-04-28 10:26 ` Paul E. McKenney
2011-04-28 13:30 ` Mike Galbraith
2011-04-28 15:28 ` Sedat Dilek
2011-04-28 15:44 ` Sedat Dilek
2011-04-28 15:48 ` Linus Torvalds [this message]
2011-04-28 18:49 ` Thomas Gleixner
2011-04-28 20:23 ` Bruno Prémont
2011-04-28 20:29 ` Thomas Gleixner
2011-04-28 20:44 ` Bruno Prémont
2011-04-28 21:04 ` Thomas Gleixner
2011-04-28 21:51 ` john stultz
2011-04-28 22:02 ` Thomas Gleixner
2011-04-28 23:06 ` Sedat Dilek
2011-04-28 23:35 ` Sedat Dilek
2011-04-29 0:42 ` Paul E. McKenney
2011-04-29 9:34 ` Thomas Gleixner
2011-04-29 7:55 ` Sedat Dilek
2011-04-29 18:09 ` Mike Frysinger
2011-04-29 18:26 ` Thomas Gleixner
2011-04-29 19:31 ` Bruno Prémont
2011-04-29 20:10 ` Thomas Gleixner
2011-04-29 20:14 ` Bruno Prémont
2011-04-30 9:14 ` Sedat Dilek
2011-04-28 20:41 ` Sedat Dilek
2011-04-28 19:22 ` Mike Galbraith
2011-04-27 21:55 ` Paul E. McKenney
2011-04-28 6:22 ` Bruno Prémont
2011-04-28 10:26 ` Paul E. McKenney
2011-04-26 17:12 ` Linus Torvalds
2011-04-26 18:50 ` Paul E. McKenney
2011-04-26 19:17 ` Sedat Dilek
2011-04-27 22:02 ` Paul E. McKenney
2011-04-25 22:08 ` Mike Frysinger
2011-04-25 17:29 ` Paul E. McKenney
2011-04-25 18:13 ` Sedat Dilek
2011-04-25 18:28 ` Paul E. McKenney
2011-04-25 17:26 ` Paul E. McKenney
2011-04-27 10:28 ` Catalin Marinas
2011-04-25 17:51 ` Pekka Enberg
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