Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756444AbXEII5h (ORCPT ); Wed, 9 May 2007 04:57:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755697AbXEII47 (ORCPT ); Wed, 9 May 2007 04:56:59 -0400 Received: from e34.co.us.ibm.com ([32.97.110.152]:43981 "EHLO e34.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755633AbXEII45 (ORCPT ); Wed, 9 May 2007 04:56:57 -0400 Date: Wed, 9 May 2007 14:26:12 +0530 From: Gautham R Shenoy To: Nick Piggin Cc: Satoru Takeuchi , vatsa@in.ibm.com, Rusty Russell , Linux Kernel , Zwane Mwaikambo , Nathan Lynch , Joel Schopp , Ashok Raj , Heiko Carstens , Ingo Molnar , paulmck@us.ibm.com Subject: Re: [BUG] cpu-hotplug: Can't offline the CPU with naughty realtime processes Message-ID: <20070509085611.GA4431@in.ibm.com> Reply-To: ego@in.ibm.com References: <87bqgxrlky.wl%takeuchi_satoru@jp.fujitsu.com> <1178545373.28438.7.camel@localhost.localdomain> <877irkrq8a.wl%takeuchi_satoru@jp.fujitsu.com> <1178593345.28438.29.camel@localhost.localdomain> <874pmoro1c.wl%takeuchi_satoru@jp.fujitsu.com> <20070508041033.GB25030@in.ibm.com> <87irb3g4zt.wl%takeuchi_satoru@jp.fujitsu.com> <20070508164850.GS7311@in.ibm.com> <87ejlqg77m.wl%takeuchi_satoru@jp.fujitsu.com> <46411A36.2050609@yahoo.com.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <46411A36.2050609@yahoo.com.au> User-Agent: Mutt/1.5.12-2006-07-14 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 869 Lines: 29 On Wed, May 09, 2007 at 10:47:50AM +1000, Nick Piggin wrote: > > We've seen the same problem with other stop_machine_run sites in the kernel. > module remove was one. > > Reserving the top priority slot for stop machine (and migration thread, I > guess) isn't a bad idea. I second this thought. The process freezer, if used will only safeguard cpu-hotplug, but not other sites which use stop_machine_run. > > -- > SUSE Labs, Novell Inc. Regards gautham. -- Gautham R Shenoy Linux Technology Center IBM India. "Freedom comes with a price tag of responsibility, which is still a bargain, because Freedom is priceless!" - 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/