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SubjectRe: [v4.8-rc1 Regression] sched/fair: Apply more PELT fixes
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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 ?
Yes, I requested that data from the bug reporter. I also built a test
kernel and requested testing of the repo Ingo pointed me at. We should
have an update shortly.

Joe


>
> Vincent
>
>> -Mike

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