From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752913AbcHOOYT (ORCPT ); Mon, 15 Aug 2016 10:24:19 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:40616 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752621AbcHOOXv (ORCPT ); Mon, 15 Aug 2016 10:23:51 -0400 Date: Mon, 15 Aug 2016 16:23:42 +0200 From: Peter Zijlstra To: Morten Rasmussen Cc: mingo@redhat.com, dietmar.eggemann@arm.com, yuyang.du@intel.com, vincent.guittot@linaro.org, mgalbraith@suse.de, sgurrappadi@nvidia.com, freedom.tan@mediatek.com, keita.kobayashi.ym@renesas.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 10/13] sched/fair: Compute task/cpu utilization at wake-up more correctly Message-ID: <20160815142342.GV6879@twins.programming.kicks-ass.net> References: <1469453670-2660-1-git-send-email-morten.rasmussen@arm.com> <1469453670-2660-11-git-send-email-morten.rasmussen@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1469453670-2660-11-git-send-email-morten.rasmussen@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 Mon, Jul 25, 2016 at 02:34:27PM +0100, Morten Rasmussen wrote: > To solve this problem, this patch introduces task_util_wake() which > computes the decayed task utilization based on the last update of the > previous cpu's last load-tracking update. It is done without having to > take the rq lock, similar to how it is done in remove_entity_load_avg(). But unlike that function, it doesn't actually use __update_load_avg(). Why not?