From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751732AbdLPGim convert rfc822-to-8bit (ORCPT ); Sat, 16 Dec 2017 01:38:42 -0500 Received: from mout.gmx.net ([212.227.15.18]:53131 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750730AbdLPGij (ORCPT ); Sat, 16 Dec 2017 01:38:39 -0500 Message-ID: <1513406272.7101.9.camel@gmx.de> Subject: Re: [PATCH v2 0/4] Utilization estimation (util_est) for FAIR tasks From: Mike Galbraith To: Patrick Bellasi Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Ingo Molnar , Peter Zijlstra , "Rafael J . Wysocki" , Viresh Kumar , Vincent Guittot , Paul Turner , Dietmar Eggemann , Morten Rasmussen , Juri Lelli , Todd Kjos , Joel Fernandes Date: Sat, 16 Dec 2017 07:37:52 +0100 In-Reply-To: <1513369387.11185.127.camel@gmx.de> References: <20171205171018.9203-1-patrick.bellasi@arm.com> <1513187793.7297.26.camel@gmx.de> <20171215161309.GF19821@e110439-lin> <1513369387.11185.127.camel@gmx.de> Content-Type: text/plain; charset="ISO-8859-15" X-Mailer: Evolution 3.20.5 Mime-Version: 1.0 Content-Transfer-Encoding: 8BIT X-Provags-ID: V03:K0:4YLOeKyvi0kVVkgTIgQUk20do2hkY27+jlK4977KVk3oY84HTXb ouZmfVXgZbHkPw3lI0D4L17fj6pfIwMxBFf+om3Mt+h4Yy9nhpDN1pbBIDV+UowG8Z8/NGk Y7sQVCXbFcfNeg/rbc/JUWo0vkGxKDgmgVVuwcA045n9a1FNRKVgq5QfOy5x/p7EeYsU6mq r9mVBfetoIWehgf1k6jSw== X-UI-Out-Filterresults: notjunk:1;V01:K0:/qsCGi5SUPQ=:eEkDu9RdMDbCTwgzmLehcs ezeUYiwulZ+BxMJNJF7Bi0h/XINMuhP8gtQtFCXOKjoyWMlw1ig3BOghJ24MKyec8tS7VV4Av QRGAF1iYiiXfe4obonVjZb0LDQZlHhGZT2s1/FW84Q67FZZILz7selqe5HeHUIVzr/qj9fQd8 yMIYxLlQBlC80FMflaDMDc8JeoUkVWRoLkODapnJXA/U0LVZj+cvS+9BAIDAn+15qU2ihSDFE He0c3GiX8/VFIqs9QJHEI6oqj3b9aRPhGec2r4b3yqC36WosfFWDuW3MxQGeBWEB76HsX0uVo g27Uk3AnxwqmboIBwLR3UxmYgYAwUqqZVB/3ANnh4LVEypGUUvQWX4npS5d9H8EESl4phyv8a DxkxNhH078sYBe3+LFvRz2hkTSRZCcO+/y0WLkaheuPWdFcK1v5oWHrIXQ97LxcaaBjSUJC8y W8sA+3ZRIQCTQ6PI09X9jsBrN0lVkMBCFh0Re13RTpf8rGEbgYczz3ccir0zcqmCqsf+DEU/l gVfk4MzYh4C+3rI7vf/NMIMqdwSEyq+NkM85Naa13Ir6m6hulq08+qYA+JRutnACkoRGVFc2N DOe9f0AqWtmQMztorET280rzVJfunp4BtTUlFHnHZeKHzfb0JriTI07SGmPdaUkJRXs6Ty04k RVUTvXzC67nDGfBh8jdliuSRFcpYhhcOlLf4IOoIrxObXK+0b3lhc2kH4dvo+AEH30pOHamy4 LosIyvWvJ34ZDar0BppbH5p/fMs1nGoNOUTQXZUGpUAOXer9FjB805qwXJ6jxvwu/HXNvvvae sHsfQBuCZQY8r2EPsP93ob0etpmO/PdWiGpgtgLZgi/r+YMpAA= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2017-12-15 at 21:23 +0100, Mike Galbraith wrote: > > Point: if you think it's OK to serialize these firefox threads, would > you still think so if those were kernel threads instead?  Serializing > your kernel is a clear fail, but unpinned kthreads can be stacked up > just as effectively as those browser threads are, eat needless wakeup > latency and pass it on. FWIW, somewhat cheezy example of that below. (later, /me returns to [apparently endless] squabble w. PELT/SIS;) bonnie in nfs mount of own box competing with 7 hogs: ------------------------------------------------------------------------------------------------------------------------------------ Task | Runtime ms | Switches | Average delay ms | Maximum delay ms | Sum delay ms | Maximum delay at | ------------------------------------------------------------------------------------------------------------------------------------ kworker/3:0:29 | 630.078 ms | 89669 | avg: 0.011 ms | max: 102.340 ms | sum: 962.919 ms | max at: 310.501277 | kworker/3:1H:464 | 1179.868 ms | 101944 | avg: 0.005 ms | max: 102.232 ms | sum: 480.915 ms | max at: 310.501273 | kswapd0:78 | 2662.230 ms | 1661 | avg: 0.128 ms | max: 93.935 ms | sum: 213.258 ms | max at: 310.503419 | nfsd:2039 | 3257.143 ms | 78448 | avg: 0.112 ms | max: 86.039 ms | sum: 8795.767 ms | max at: 258.847140 | nfsd:2038 | 3185.730 ms | 76253 | avg: 0.113 ms | max: 78.348 ms | sum: 8580.676 ms | max at: 258.831370 | nfsd:2042 | 3256.554 ms | 81423 | avg: 0.110 ms | max: 74.941 ms | sum: 8929.015 ms | max at: 288.397203 | nfsd:2040 | 3314.826 ms | 80396 | avg: 0.105 ms | max: 51.039 ms | sum: 8471.816 ms | max at: 363.870078 | nfsd:2036 | 3058.867 ms | 70460 | avg: 0.115 ms | max: 44.629 ms | sum: 8092.319 ms | max at: 250.074253 | nfsd:2037 | 3113.592 ms | 74276 | avg: 0.115 ms | max: 43.294 ms | sum: 8556.110 ms | max at: 310.443722 | konsole:4013 | 402.509 ms | 894 | avg: 0.148 ms | max: 38.129 ms | sum: 132.050 ms | max at: 332.156495 | haveged:497 | 11.831 ms | 1224 | avg: 0.104 ms | max: 37.575 ms | sum: 127.706 ms | max at: 350.669645 | nfsd:2043 | 3316.033 ms | 78303 | avg: 0.115 ms | max: 36.511 ms | sum: 8995.138 ms | max at: 248.576108 | nfsd:2035 | 3064.108 ms | 67413 | avg: 0.115 ms | max: 28.221 ms | sum: 7746.306 ms | max at: 313.785682 | bash:7022 | 0.342 ms | 1 | avg: 22.959 ms | max: 22.959 ms | sum: 22.959 ms | max at: 262.258960 | kworker/u16:4:354 | 2073.383 ms | 1550 | avg: 0.050 ms | max: 21.203 ms | sum: 77.185 ms | max at: 332.220678 | kworker/4:3:6975 | 1189.868 ms | 115776 | avg: 0.018 ms | max: 20.856 ms | sum: 2071.894 ms | max at: 348.142757 | kworker/2:4:6981 | 335.895 ms | 26617 | avg: 0.023 ms | max: 20.726 ms | sum: 625.102 ms | max at: 248.522083 | bash:7021 | 0.517 ms | 2 | avg: 10.363 ms | max: 20.726 ms | sum: 20.727 ms | max at: 262.235708 | ksoftirqd/2:22 | 65.718 ms | 998 | avg: 0.138 ms | max: 19.072 ms | sum: 137.827 ms | max at: 332.221676 | kworker/7:3:6969 | 625.724 ms | 84153 | avg: 0.010 ms | max: 18.838 ms | sum: 876.603 ms | max at: 264.188983 | bonnie:6965 | 79637.998 ms | 35434 | avg: 0.007 ms | max: 18.719 ms | sum: 256.748 ms | max at: 331.299867 |