From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932390AbbCIOgR (ORCPT ); Mon, 9 Mar 2015 10:36:17 -0400 Received: from mail-wi0-f181.google.com ([209.85.212.181]:45348 "EHLO mail-wi0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752035AbbCIOgO (ORCPT ); Mon, 9 Mar 2015 10:36:14 -0400 Message-ID: <1425911771.30469.8.camel@gmail.com> Subject: Re: [patch-3.18.7-rt1] sched/context-tracking: fix PREEMPT_LAZY explosions From: Mike Galbraith To: Sebastian Andrzej Siewior Cc: linux-rt-users , LKML , Thomas Gleixner , rostedt@goodmis.org, John Kacur Date: Mon, 09 Mar 2015 15:36:11 +0100 In-Reply-To: <20150309134535.GA13768@linutronix.de> References: <20150216111822.GA21649@linutronix.de> <1424258514.3819.39.camel@gmail.com> <20150309134535.GA13768@linutronix.de> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.11 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2015-03-09 at 14:45 +0100, Sebastian Andrzej Siewior wrote: > * Mike Galbraith | 2015-02-18 12:21:54 [+0100]: > > >On Mon, 2015-02-16 at 12:18 +0100, Sebastian Andrzej Siewior wrote: > > > >> Known issues: > >> > >> - lazy preempt on x86_64 leads to a crash with some load. > > > >The below still works for me. (it doesn't make nohz_full actually work > >in rt, but at least folks who want to tinker with it can do so) > So your box still crashes without it? > > The thing is I tried to reproduce it and it does not occur anymore. > Neither in KVM nor on real HW. Heh, well that's interesting, I just presumed it would still explode because you said it would. I'll beat on it any let you know if I'm carrying a placebo patch or not :) -Mike