From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756966AbcDGQtB (ORCPT ); Thu, 7 Apr 2016 12:49:01 -0400 Received: from www.linutronix.de ([62.245.132.108]:48762 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755954AbcDGQs7 (ORCPT ); Thu, 7 Apr 2016 12:48:59 -0400 Subject: Re: [rfc patch 2/2] rt/locking/hotplug: Fix rt_spin_lock_slowlock() migrate_disable() bug To: Mike Galbraith References: <1455318168-7125-1-git-send-email-bigeasy@linutronix.de> <1455318168-7125-4-git-send-email-bigeasy@linutronix.de> <1458463425.3908.5.camel@gmail.com> <1458814024.23732.35.camel@gmail.com> <1459405903.14336.64.camel@gmail.com> <20160401211105.GE29603@linutronix.de> <1459566735.3779.36.camel@gmail.com> <1459837988.26938.16.camel@gmail.com> <1459860597.7776.2.camel@gmail.com> <1459944021.3990.14.camel@gmail.com> <1460003831.3882.106.camel@gmail.com> Cc: Thomas Gleixner , linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org, Steven Rostedt , Peter Zijlstra From: Sebastian Andrzej Siewior Message-ID: <57068F78.2070607@linutronix.de> Date: Thu, 7 Apr 2016 18:48:56 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.7.0 MIME-Version: 1.0 In-Reply-To: <1460003831.3882.106.camel@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/07/2016 06:37 AM, Mike Galbraith wrote: > On Wed, 2016-04-06 at 14:00 +0200, Mike Galbraith wrote: >> It'll take a hotplug beating seemingly as well as any non-rt kernel, >> but big box NAKed it due to jitter, which can mean 1.0 things.. duh. > > FWIW, the below turned big box NAK into ACK. Stressing hotplug over > night, iteration completion time went from about 2 1/2 hours with > bandaids on the two identified rt sore spots, to an hour and 10 minutes > as well for some reason, but whatever.. Just to be clear. I need #1, #2 from this thread and this below to make it work? > -Mike > Sebastian