Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761409AbYFDSXs (ORCPT ); Wed, 4 Jun 2008 14:23:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756479AbYFDSXk (ORCPT ); Wed, 4 Jun 2008 14:23:40 -0400 Received: from wolverine02.qualcomm.com ([199.106.114.251]:45115 "EHLO wolverine02.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755310AbYFDSXj (ORCPT ); Wed, 4 Jun 2008 14:23:39 -0400 X-IronPort-AV: E=McAfee;i="5200,2160,5310"; a="3504817" Message-ID: <4846DDC1.1050203@qualcomm.com> Date: Wed, 04 Jun 2008 11:24:01 -0700 From: Max Krasnyansky User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Peter Zijlstra CC: Dimitri Sivanich , linux-kernel@vger.kernel.org, Ingo Molnar , Nick Piggin , rostedt@goodmis.org, Oleg Nesterov , "Paul E. McKenney" , Paul Menage , "Randy.Dunlap" , suresh.b.siddha@intel.com Subject: Re: Stop machine threads are getting preemted by the rt period enforcement References: <20080601213019.14ea8ef8.pj@sgi.com> <20080602164203.GA2477@sgi.com> <48443E66.6060205@qualcomm.com> <20080602214151.GA7072@sgi.com> <48446D46.2010903@qualcomm.com> <20080603144010.GA25948@sgi.com> <20080604140036.GC18993@sgi.com> <4846D9FE.4030804@qualcomm.com> <1212603506.19205.2.camel@lappy.programming.kicks-ass.net> In-Reply-To: <1212603506.19205.2.camel@lappy.programming.kicks-ass.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 894 Lines: 25 Peter Zijlstra wrote: > On Wed, 2008-06-04 at 11:07 -0700, Max Krasnyansky wrote: >> Peter, Ingo, >> >> Take a look at the report below (came up during isolcpu= remove discussions). >> >> It looks like stop_machine threads are getting forcefully preempted because >> they exceed their RT quanta. It's strange because rt period is pretty long. >> But given that disabling rt period logic solves the issue the machine was not >> really stuck. > > Yeah, I know, I'm already looking at this I see. Does it look like a bug in the rt period logic ? Or did the stop_machine thread really run for a long time (in the report that you got that is) ? Max -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/