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From: Joseph Salisbury <joseph.salisbury@canonical.com>
To: peterz@infradead.org
Cc: torvalds@linux-foundation.org, efault@gmx.de, tglx@linutronix.de,
	LKML <linux-kernel@vger.kernel.org>,
	mingo@kernel.org
Subject: [v4.8-rc1 Regression] sched/fair: Apply more PELT fixes
Date: Fri, 7 Oct 2016 15:38:23 -0400	[thread overview]
Message-ID: <57F7F9AF.2010609@canonical.com> (raw)

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

The regression was introduced as of v4.8-rc1.  The bug can be reproduced
on an X1 Carbon with the following:
stress -c $your_total_cpu_cores

I was hoping to get your feedback, since you are the patch author.  Do
you think gathering any additional data will help diagnose this issue,
or would it be best to submit a revert request? 


Thanks,

Joe


[0] http://pad.lv/1627108

             reply	other threads:[~2016-10-07 19:38 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-07 19:38 Joseph Salisbury [this message]
2016-10-07 19:57 ` [v4.8-rc1 Regression] sched/fair: Apply more PELT fixes 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
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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