From: Steve Muckle <steve.muckle@linaro.org>
To: Juri Lelli <Juri.Lelli@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Michael Turquette <mturquette@baylibre.com>,
rjw@rjwysocki.net, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, morten.rasmussen@arm.com,
dietmar.eggemann@arm.com, vincent.guittot@linaro.org,
Michael Turquette <mturquette+renesas@baylibre.com>,
Patrick Bellasi <patrick.bellasi@arm.com>
Subject: Re: [PATCH 4/8] cpufreq/schedutil: sysfs capacity margin tunable
Date: Thu, 17 Mar 2016 06:55:34 -0700 [thread overview]
Message-ID: <56EAB756.1050805@linaro.org> (raw)
In-Reply-To: <20160317094046.GF18212@e106622-lin>
On 03/17/2016 02:40 AM, Juri Lelli wrote:
>> Could the default schedtune value not serve as the out of the box margin?
>>
> I'm not sure I understand you here. For me schedtune should be disabled
> by default, so I'd say that it doesn't introduce any additional margin
> by default. But we still need a margin to make the governor work without
> schedtune in the mix.
Why not have schedtune be enabled always, and use it to add the margin?
It seems like it'd simplify things.
I haven't looked at the schedtune code at all so I don't know whether
this makes sense given its current implementation. But conceptually I
don't know why we'd need or want one margin in schedutil which will be
tunable, and then another mechanism for tuning as well.
next prev parent reply other threads:[~2016-03-17 13:55 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-14 5:22 [PATCH 0/8] schedutil enhancements Michael Turquette
2016-03-14 5:22 ` [PATCH 1/8] sched/cpufreq: remove cpufreq_trigger_update() Michael Turquette
2016-03-15 21:14 ` Peter Zijlstra
[not found] ` <20160315214545.30639.98727@quark.deferred.io>
2016-03-15 21:49 ` Peter Zijlstra
2016-03-16 8:00 ` Peter Zijlstra
2016-03-14 5:22 ` [PATCH 2/8] sched/fair: add margin to utilization update Michael Turquette
2016-03-15 21:16 ` Peter Zijlstra
[not found] ` <20160315212848.30639.38747@quark.deferred.io>
2016-03-15 21:43 ` Peter Zijlstra
2016-03-16 2:52 ` Steve Muckle
2016-03-16 22:12 ` Michael Turquette
2016-03-14 5:22 ` [PATCH 3/8] sched/cpufreq: new cfs capacity margin helpers Michael Turquette
2016-03-15 21:17 ` Peter Zijlstra
2016-03-14 5:22 ` [PATCH 4/8] cpufreq/schedutil: sysfs capacity margin tunable Michael Turquette
2016-03-15 21:20 ` Peter Zijlstra
[not found] ` <20160315214043.30639.75507@quark.deferred.io>
2016-03-15 21:48 ` Peter Zijlstra
[not found] ` <20160315223701.30639.43127@quark.deferred.io>
2016-03-16 3:36 ` Steve Muckle
2016-03-16 8:05 ` Peter Zijlstra
2016-03-16 10:02 ` Juri Lelli
2016-03-16 17:55 ` Steve Muckle
2016-03-16 22:05 ` Michael Turquette
2016-03-17 9:40 ` Juri Lelli
2016-03-17 13:55 ` Steve Muckle [this message]
2016-03-17 15:53 ` Patrick Bellasi
2016-03-17 17:54 ` Juri Lelli
2016-03-17 18:56 ` Michael Turquette
2016-03-17 22:34 ` Rafael J. Wysocki
2016-03-16 12:45 ` Rafael J. Wysocki
2016-03-16 22:03 ` Michael Turquette
2016-03-14 5:22 ` [PATCH 5/8] sched/cpufreq: pass sched class into cpufreq_update_util Michael Turquette
2016-03-15 21:25 ` Peter Zijlstra
[not found] ` <20160315220609.30639.67271@quark.deferred.io>
2016-03-16 3:55 ` Steve Muckle
2016-03-16 7:41 ` Peter Zijlstra
2016-03-16 8:29 ` Vincent Guittot
2016-03-16 8:53 ` Peter Zijlstra
2016-03-16 9:16 ` Vincent Guittot
2016-03-16 12:39 ` Rafael J. Wysocki
2016-03-16 13:10 ` Peter Zijlstra
2016-03-16 13:23 ` Rafael J. Wysocki
2016-03-16 13:43 ` Peter Zijlstra
2016-03-14 5:22 ` [PATCH 6/8] cpufreq/schedutil: sum per-sched class utilization Michael Turquette
2016-03-15 21:29 ` Peter Zijlstra
[not found] ` <20160315220951.30639.12872@quark.deferred.io>
2016-03-16 7:38 ` Peter Zijlstra
2016-03-16 18:20 ` Steve Muckle
2016-03-16 18:36 ` Peter Zijlstra
2016-03-16 19:12 ` Steve Muckle
2016-03-14 5:22 ` [PATCH 7/8] cpufreq: Frequency invariant scheduler load-tracking support Michael Turquette
2016-03-15 19:13 ` Dietmar Eggemann
2016-03-15 20:19 ` Michael Turquette
2016-03-15 21:32 ` Peter Zijlstra
2016-03-16 18:33 ` Dietmar Eggemann
2016-03-15 21:34 ` Peter Zijlstra
2016-03-14 5:22 ` [PATCH 8/8] sched: prefer cpufreq_scale_freq_capacity Michael Turquette
2016-03-15 19:13 ` Dietmar Eggemann
2016-03-15 20:46 ` Michael Turquette
2016-03-16 19:44 ` Dietmar Eggemann
2016-03-16 20:07 ` Peter Zijlstra
2016-03-16 21:32 ` Rafael J. Wysocki
2016-03-15 21:37 ` Peter Zijlstra
[not found] ` <20160315222721.30639.28332@quark.deferred.io>
2016-03-16 7:47 ` Peter Zijlstra
2016-03-16 12:41 ` Peter Zijlstra
2016-03-16 0:08 ` [PATCH 0/8] schedutil enhancements Rafael J. Wysocki
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