From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755639AbcJGTif convert rfc822-to-8bit (ORCPT ); Fri, 7 Oct 2016 15:38:35 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:55393 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753873AbcJGTi0 (ORCPT ); Fri, 7 Oct 2016 15:38:26 -0400 To: peterz@infradead.org From: Joseph Salisbury Subject: [v4.8-rc1 Regression] sched/fair: Apply more PELT fixes Cc: torvalds@linux-foundation.org, efault@gmx.de, tglx@linutronix.de, LKML , mingo@kernel.org Message-ID: <57F7F9AF.2010609@canonical.com> Date: Fri, 7 Oct 2016 15:38:23 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 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