From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2BDEEC433FF for ; Thu, 8 Aug 2019 16:39:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 06F73217F4 for ; Thu, 8 Aug 2019 16:39:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404077AbfHHQjs (ORCPT ); Thu, 8 Aug 2019 12:39:48 -0400 Received: from mga05.intel.com ([192.55.52.43]:19939 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727096AbfHHQjr (ORCPT ); Thu, 8 Aug 2019 12:39:47 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Aug 2019 09:39:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,362,1559545200"; d="scan'208";a="203636752" Received: from schen9-desk.jf.intel.com (HELO [10.54.74.162]) ([10.54.74.162]) by fmsmga002.fm.intel.com with ESMTP; 08 Aug 2019 09:39:46 -0700 To: Aaron Lu Cc: Julien Desfossez , "Li, Aubrey" , Aubrey Li , Subhra Mazumdar , Vineeth Remanan Pillai , Nishanth Aravamudan , Peter Zijlstra , Ingo Molnar , Thomas Gleixner , Paul Turner , Linus Torvalds , Linux List Kernel Mailing , =?UTF-8?B?RnLDqWTDqXJpYyBXZWlzYmVja2Vy?= , Kees Cook , Greg Kerr , Phil Auld , Valentin Schneider , Mel Gorman , Pawan Gupta , Paolo Bonzini References: <20190613032246.GA17752@sinkpad> <20190619183302.GA6775@sinkpad> <20190718100714.GA469@aaronlu> <20190725143003.GA992@aaronlu> <20190726152101.GA27884@sinkpad> <7dc86e3c-aa3f-905f-3745-01181a3b0dac@linux.intel.com> <20190802153715.GA18075@sinkpad> <20190808125516.GA67687@aaronlu> From: Tim Chen Openpgp: preference=signencrypt Autocrypt: addr=tim.c.chen@linux.intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190808125516.GA67687@aaronlu> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/8/19 5:55 AM, Aaron Lu wrote: > On Mon, Aug 05, 2019 at 08:55:28AM -0700, Tim Chen wrote: >> On 8/2/19 8:37 AM, Julien Desfossez wrote: >>> We tested both Aaron's and Tim's patches and here are our results. > > diff --git a/kernel/sched/core.c b/kernel/sched/core.c > index 26fea68f7f54..542974a8da18 100644 > --- a/kernel/sched/core.c > +++ b/kernel/sched/core.c > @@ -3888,7 +3888,7 @@ next_class:; > WARN_ON_ONCE(!rq_i->core_pick); > > if (is_idle_task(rq_i->core_pick) && rq_i->nr_running) > - rq->core_forceidle = true; > + rq_i->core_forceidle = true; Good catch! > > rq_i->core_pick->core_occupation = occ; > > With this fixed and together with the patch to let schedule always > happen, your latest 2 patches work well for the 10s cpuhog test I > described previously: > https://lore.kernel.org/lkml/20190725143003.GA992@aaronlu/ That's encouraging. You are talking about my patches that try to keep the force idle time between sibling threads balanced, right? > > overloaded workload without any cpu binding doesn't work well though, I > haven't taken a closer look yet. > I think we need a load balancing scheme among the cores that will try to minimize force idle. One possible metric to measure load compatibility imbalance that leads to force idle is Say i, j are sibling threads of a cpu core imbalanace = \sum_tagged_cgroup abs(Load_cgroup_cpui - Load_cgroup_cpuj) This gives us a metric to decide if migrating a task will improve load compatability imbalance. As we already track cgroup load on a CPU, it should be doable without adding too much overhead. Tim