From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Galbraith Subject: Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Date: Fri, 08 Apr 2016 14:10:21 +0200 Message-ID: <1460117421.5582.35.camel@gmail.com> 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> <57068F28.8010409@linutronix.de> <1460055880.4435.61.camel@gmail.com> <5707883F.4080302@linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Thomas Gleixner , linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org, Steven Rostedt , Peter Zijlstra To: Sebastian Andrzej Siewior Return-path: Received: from mail-wm0-f48.google.com ([74.125.82.48]:34128 "EHLO mail-wm0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753118AbcDHMKZ (ORCPT ); Fri, 8 Apr 2016 08:10:25 -0400 In-Reply-To: <5707883F.4080302@linutronix.de> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On Fri, 2016-04-08 at 12:30 +0200, Sebastian Andrzej Siewior wrote: > On 04/07/2016 09:04 PM, Mike Galbraith wrote: > > > just to be clear: The patch I attached did _not_ work for you. > > > > Sorry, I didn't test. Marathon stress test session convinced me that > > the lock added by -rt absolutely had to die. > > Okay. And the patch did that. I removed the lock. But also adds when it appears no addition is required. I don't care how it dies though, only that it does. > I see. So what I don't like are all the exceptions you have: one for > RCU and one kernfs. There might come more in the future. So what I aim > is the removal of the lock. Yes, those two were bandaids to allow searching for more -rt specific disease (none found). Removing that lock is the cure. -Mike