From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Joseph Salisbury <joseph.salisbury@canonical.com>,
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: Fri, 14 Oct 2016 14:10:07 +0100 [thread overview]
Message-ID: <d0b0e00d-2892-6386-3e09-8df568e161ef@arm.com> (raw)
In-Reply-To: <CAKfTPtADw=JChCccEQ+HohaYwbOCh3QuWOFrGJdGudOHCD8-OA@mail.gmail.com>
On 14/10/16 09:24, Vincent Guittot wrote:
> On 13 October 2016 at 23:34, Vincent Guittot <vincent.guittot@linaro.org> wrote:
>> On 13 October 2016 at 20:49, Dietmar Eggemann <dietmar.eggemann@arm.com> wrote:
>>> On 13/10/16 17:48, Vincent Guittot wrote:
>>>> On 13 October 2016 at 17:52, Joseph Salisbury
>>>> <joseph.salisbury@canonical.com> wrote:
>>>>> On 10/13/2016 06:58 AM, Vincent Guittot wrote:
>>>>>> Hi,
>>>>>>
>>>>>> On 12 October 2016 at 18:21, Joseph Salisbury
>>>>>> <joseph.salisbury@canonical.com> wrote:
>>>>>>> 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:
[...]
>>> When I create a tg_root/tg_x/tg_y_1 and a tg_root/tg_x/tg_y_2 group, the tg_x->load_avg
>>> becomes > 6*1024 before any tasks ran in it.
>>
>> This is normal as se->avg.load_avg is initialized to
>> scale_load_down(se->load.weight) and this se->avg.load_avg will be
>> added to tg_x[cpu]->cfs_rq->avg.load_avg when attached to the cfs_rq
Yeah, you right, even when I've created 50 second level groups,
tg_x->load_avg is ~6800.
Could it have something to do with the fact that .se->load.weight = 2
for all these task groups? on a 64bit system?
In case we call __update_load_avg(..., se->on_rq *
scale_load_down(se->load.weight), ...) we pass a weight argument of 0
for these se's.
Does not happen with:
- if (shares < MIN_SHARES)
- shares = MIN_SHARES;
+ if (shares < scale_load(MIN_SHARES))
+ shares = scale_load(MIN_SHARES);
in calc_cfs_shares().
[...]
next prev parent reply other threads:[~2016-10-14 13:10 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
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 [this message]
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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