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From: Joseph Salisbury <joseph.salisbury@canonical.com>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>,
	Mike Galbraith <efault@gmx.de>
Subject: Re: [v4.8-rc1 Regression] sched/fair: Apply more PELT fixes
Date: Wed, 12 Oct 2016 12:21:22 -0400	[thread overview]
Message-ID: <57FE6302.6060103@canonical.com> (raw)
In-Reply-To: <CAKfTPtDo7PsZjDSH4KteyCJ=yq63Ha5iwkucjRTvtP_J3o=MKw@mail.gmail.com>

On 10/12/2016 08:20 AM, Vincent Guittot wrote:
> On 8 October 2016 at 13:49, Mike Galbraith <efault@gmx.de> wrote:
>> On Sat, 2016-10-08 at 13:37 +0200, Vincent Guittot wrote:
>>> On 8 October 2016 at 10:39, Ingo Molnar <mingo@kernel.org> wrote:
>>>> * Peter Zijlstra <peterz@infradead.org> wrote:
>>>>
>>>>> On Fri, Oct 07, 2016 at 03:38:23PM -0400, Joseph Salisbury wrote:
>>>>>> Hello Peter,
>>>>>>
>>>>>> A kernel bug report was opened against Ubuntu [0].  After a
>>>>>> kernel
>>>>>> bisect, it was found that reverting the following commit
>>>>>> resolved this bug:
>>>>>>
>>>>>> commit 3d30544f02120b884bba2a9466c87dba980e3be5
>>>>>> Author: Peter Zijlstra <peterz@infradead.org>
>>>>>> Date:   Tue Jun 21 14:27:50 2016 +0200
>>>>>>
>>>>>>     sched/fair: Apply more PELT fixes
>>> This patch only speeds up the update of task group load in order to
>>> reflect the new load balance but It should not change the final value
>>> and as a result the final behavior. I will try to reproduce it in my
>>> target later today
>> FWIW, I tried and failed w/wo autogroup on 4.8 and master.
> Me too
>
> Is it possible to get some dump of  /proc/sched_debug while the problem occurs ?
>
> Vincent
>
>>         -Mike

The output from /proc/shed_debug can be seen here:
http://paste.ubuntu.com/23312351/

Ingo, the latest scheduler bits also still exhibit the bug:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git

  parent reply	other threads:[~2016-10-12 16:21 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-07 19:38 [v4.8-rc1 Regression] sched/fair: Apply more PELT fixes Joseph Salisbury
2016-10-07 19:57 ` Linus Torvalds
2016-10-07 20:22   ` Joseph Salisbury
2016-10-07 20:37     ` Linus Torvalds
2016-10-08  8:00 ` Peter Zijlstra
2016-10-08  8:39   ` Ingo Molnar
2016-10-08 11:37     ` Vincent Guittot
2016-10-08 11:49       ` Mike Galbraith
2016-10-12 12:20         ` Vincent Guittot
2016-10-12 15:35           ` Joseph Salisbury
2016-10-12 16:21           ` Joseph Salisbury [this message]
2016-10-13 10:58             ` Vincent Guittot
2016-10-13 15:52               ` Joseph Salisbury
2016-10-13 16:48                 ` Vincent Guittot
2016-10-13 18:49                   ` Dietmar Eggemann
2016-10-13 21:34                     ` Vincent Guittot
2016-10-14  8:24                       ` Vincent Guittot
2016-10-14 13:10                         ` Dietmar Eggemann
2016-10-14 15:18                           ` Vincent Guittot
2016-10-14 16:04                             ` Joseph Salisbury
2016-10-17  9:09                               ` Vincent Guittot
2016-10-17 11:49                                 ` Dietmar Eggemann
2016-10-17 13:19                                   ` Peter Zijlstra
2016-10-17 13:54                                     ` Vincent Guittot
2016-10-17 22:52                                       ` Dietmar Eggemann
2016-10-18  8:43                                         ` Vincent Guittot
2016-10-18  9:07                                         ` Peter Zijlstra
2016-10-18  9:45                                           ` Vincent Guittot
2016-10-18 10:34                                             ` Peter Zijlstra
2016-10-18 11:56                                               ` Vincent Guittot
2016-10-18 21:58                                                 ` Joonwoo Park
2016-10-19  6:42                                                   ` Vincent Guittot
2016-10-19  9:46                                                 ` Dietmar Eggemann
2016-10-19 11:25                                                   ` Vincent Guittot
2016-10-19 15:33                                                     ` Dietmar Eggemann
2016-10-19 17:33                                                       ` Joonwoo Park
2016-10-19 17:50                                                       ` Vincent Guittot
2016-10-19 11:33                                                 ` Peter Zijlstra
2016-10-19 11:50                                                   ` Vincent Guittot
2016-10-19 13:30                                                 ` Morten Rasmussen
2016-10-19 17:41                                                   ` Vincent Guittot
2016-10-20  7:56                                                     ` Morten Rasmussen
2016-10-19 14:49                                                 ` Joseph Salisbury
2016-10-19 14:53                                                   ` Vincent Guittot
2016-10-18 11:15                                           ` Dietmar Eggemann
2016-10-18 12:07                                             ` Peter Zijlstra

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