Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751734AbbEDOJu (ORCPT ); Mon, 4 May 2015 10:09:50 -0400 Received: from mail-wi0-f177.google.com ([209.85.212.177]:37855 "EHLO mail-wi0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751664AbbEDOJl (ORCPT ); Mon, 4 May 2015 10:09:41 -0400 Message-ID: <1430748582.3166.16.camel@gmail.com> Subject: Re: [PATCH] sched: Relax a restriction in sched_rt_can_attach() From: Mike Galbraith To: Peter Zijlstra Cc: Zefan Li , Ingo Molnar , Tejun Heo , LKML , Cgroups Date: Mon, 04 May 2015 16:09:42 +0200 In-Reply-To: <20150504123738.GZ21418@twins.programming.kicks-ass.net> References: <5546C34C.7050202@huawei.com> <1430709236.3129.42.camel@gmail.com> <5546F80B.3070802@huawei.com> <1430716247.3129.44.camel@gmail.com> <1430717964.3129.62.camel@gmail.com> <554737AE.5040402@huawei.com> <20150504123738.GZ21418@twins.programming.kicks-ass.net> 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 Content-Length: 1111 Lines: 29 On Mon, 2015-05-04 at 14:37 +0200, Peter Zijlstra wrote: > On Mon, May 04, 2015 at 05:11:10PM +0800, Zefan Li wrote: > > > Some degree of flexibility is provided so that you may disable some controllers > > in a subtree. For example: > > > > root ---> child1 > > (cpuset,memory,cpu) (cpuset,memory) > > \ > > \-> child2 > > (cpu) > > Uhm, how does that work? Would a task their effective cgroup be the > first parent that has a controller enabled? > > In particular, in your example, if T were part of child1, would its cpu > controller be root? That's what I'd hope for. I wanted to try that cgroup.subtree_control gizmo to see for myself, but I don't have one, and probably won't get one until I introduce systemd to my axe (again, it's a slow learner). -Mike -- 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/