Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754686AbaKEK7o (ORCPT ); Wed, 5 Nov 2014 05:59:44 -0500 Received: from mail-pa0-f43.google.com ([209.85.220.43]:48851 "EHLO mail-pa0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754466AbaKEK7n (ORCPT ); Wed, 5 Nov 2014 05:59:43 -0500 Message-ID: <545A0317.4090406@gmail.com> Date: Wed, 05 Nov 2014 18:59:35 +0800 From: Wanpeng Li User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Peter Zijlstra , Wanpeng Li CC: Ingo Molnar , Juri Lelli , Kirill Tkhai , linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH v2] sched/deadline: support dl task migration during cpu hotplug References: <1415177517-7189-1-git-send-email-wanpeng.li@linux.intel.com> <20141105105058.GQ3337@twins.programming.kicks-ass.net> In-Reply-To: <20141105105058.GQ3337@twins.programming.kicks-ass.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Peter, On 14/11/5 下午6:50, Peter Zijlstra wrote: > On Wed, Nov 05, 2014 at 04:51:57PM +0800, Wanpeng Li wrote: >> Note: dl task can be migrated successfully if rq is offline currently, however, >> I'm still not sure why task_rq(task)->rd->span just include the cpu which the dl >> task previous running on, so cpu_active_mask is used in the patch. >> >> Peterz, Juri? > So the root domain span is for exclusive cpusets > (Documentation/cgroups/cpusets.txt) where we fully separate sets of CPUs > and have no load-balancing between the sets. > > For 'normal' setups the rd->span is the entire machine, but using > cpusets you can create more (smaller) domains. I don't setup any cpusets related stuff, however, task_rq(task)->rd->span just include the cpu which the dl task previous running on instead of the entire machine in find_later_rq(). Regards, Wanpeng Li > > Is this what you were asking? > -- > 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/ -- 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/