From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753281AbcIORzN (ORCPT ); Thu, 15 Sep 2016 13:55:13 -0400 Received: from merlin.infradead.org ([205.233.59.134]:52860 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752020AbcIORzE (ORCPT ); Thu, 15 Sep 2016 13:55:04 -0400 Date: Thu, 15 Sep 2016 19:54:55 +0200 From: Peter Zijlstra To: Dietmar Eggemann Cc: Vincent Guittot , mingo@kernel.org, linux-kernel@vger.kernel.org, yuyang.du@intel.com, Morten.Rasmussen@arm.com, linaro-kernel@lists.linaro.org, pjt@google.com, bsegall@google.com Subject: Re: [PATCH 4/7 v3] sched: propagate load during synchronous attach/detach Message-ID: <20160915175455.GI5012@twins.programming.kicks-ass.net> References: <1473666472-13749-1-git-send-email-vincent.guittot@linaro.org> <1473666472-13749-5-git-send-email-vincent.guittot@linaro.org> <896df1f8-c5ee-ae4c-46f0-4f4e76ad19b1@arm.com> <20160915151415.GF5012@twins.programming.kicks-ass.net> <038286f2-02bf-e635-e60a-33904e38826c@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <038286f2-02bf-e635-e60a-33904e38826c@arm.com> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 15, 2016 at 06:36:53PM +0100, Dietmar Eggemann wrote: > > We did however loose a lot on why and how min(1, runnable_avg) is a > > sensible thing to do... > > Do you refer to the big comment on top of this if condition in the old > code in __update_group_entity_contrib()? The last two subsections of it > I never understood ... > > [...] Read the thread here: http://www.gossamer-threads.com/lists/linux/kernel/1558210 But Vince's explanation earlier is also good.