From: Mike Galbraith <efault@gmx.de>
To: Patrick Bellasi <patrick.bellasi@arm.com>
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Paul Turner <pjt@google.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Juri Lelli <juri.lelli@redhat.com>, Todd Kjos <tkjos@android.com>,
Joel Fernandes <joelaf@google.com>
Subject: Re: [PATCH v2 0/4] Utilization estimation (util_est) for FAIR tasks
Date: Sat, 16 Dec 2017 07:37:52 +0100 [thread overview]
Message-ID: <1513406272.7101.9.camel@gmx.de> (raw)
In-Reply-To: <1513369387.11185.127.camel@gmx.de>
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 |
prev parent reply other threads:[~2017-12-16 6:38 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-05 17:10 [PATCH v2 0/4] Utilization estimation (util_est) for FAIR tasks Patrick Bellasi
2017-12-05 17:10 ` [PATCH v2 1/4] sched/fair: always used unsigned long for utilization Patrick Bellasi
2017-12-06 8:56 ` Vincent Guittot
2018-01-10 12:14 ` [tip:sched/core] sched/fair: Use 'unsigned long' for utilization, consistently tip-bot for Patrick Bellasi
2017-12-05 17:10 ` [PATCH v2 2/4] sched/fair: add util_est on top of PELT Patrick Bellasi
2017-12-13 16:05 ` Peter Zijlstra
2017-12-15 14:02 ` Patrick Bellasi
2017-12-15 14:07 ` Peter Zijlstra
2017-12-15 15:22 ` Patrick Bellasi
2017-12-13 16:16 ` Peter Zijlstra
2017-12-15 12:14 ` Patrick Bellasi
2017-12-15 12:53 ` Peter Zijlstra
2017-12-15 15:41 ` Patrick Bellasi
2017-12-20 8:57 ` Peter Zijlstra
2017-12-20 9:02 ` Peter Zijlstra
2017-12-13 16:19 ` Peter Zijlstra
2017-12-13 16:36 ` Patrick Bellasi
2017-12-13 17:03 ` Peter Zijlstra
2017-12-15 12:03 ` Patrick Bellasi
2017-12-15 12:58 ` Peter Zijlstra
2017-12-05 17:10 ` [PATCH v2 3/4] sched/fair: use util_est in LB and WU paths Patrick Bellasi
2017-12-05 17:10 ` [PATCH v2 4/4] sched/cpufreq_schedutil: use util_est for OPP selection Patrick Bellasi
2017-12-16 2:35 ` Rafael J. Wysocki
2017-12-18 10:48 ` Patrick Bellasi
2017-12-13 16:03 ` [PATCH v2 0/4] Utilization estimation (util_est) for FAIR tasks Peter Zijlstra
2017-12-13 16:23 ` Patrick Bellasi
2017-12-13 17:56 ` Mike Galbraith
2017-12-15 16:13 ` Patrick Bellasi
2017-12-15 20:23 ` Mike Galbraith
2017-12-16 6:37 ` Mike Galbraith [this message]
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