From: Peter Zijlstra <peterz@infradead.org>
To: Juri Lelli <Juri.Lelli@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Steve Muckle <steve.muckle@linaro.org>,
Ingo Molnar <mingo@redhat.com>,
"Rafael J . Wysocki" <rafael@kernel.org>,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
Vincent Guittot <vincent.guittot@linaro.org>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Patrick Bellasi <patrick.bellasi@arm.com>
Subject: Re: [PATCH 2/2] sched: cpufreq: use rt_avg as estimate of required RT CPU capacity
Date: Thu, 1 Sep 2016 09:12:30 +0200 [thread overview]
Message-ID: <20160901071230.GI10153@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160831170002.GK9337@e106622-lin>
On Wed, Aug 31, 2016 at 06:00:02PM +0100, Juri Lelli wrote:
> On 31/08/16 18:40, Peter Zijlstra wrote:
> > Another problem is that we have many semi related knobs; we have the
> > global RT runtime limit knob, but that doesn't affect cpufreq (maybe it
> > should)
>
> Maybe we could create this sort of link when using the cgroup RT
> throttling interface as well? It should still then fit well once we
> replace the underlying mechanism with DL reservations. And, AFAIK, the
> interface is used by Android folks already.
Tricky, but possible I suppose.
Since minimal cpufreq is 'global', the cgroup reservation only matters
if there are no tasks in any of its parent groups. Computing the
effective rt min then again becomes somewhat tricky, since we'd have to
iterate the cgroup tree.
next prev parent reply other threads:[~2016-09-01 7:12 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-26 18:40 [PATCH 0/2] utilization changes for schedutil Steve Muckle
2016-08-26 18:40 ` [PATCH 1/2] sched: cpufreq: ignore SMT when determining max cpu capacity Steve Muckle
2016-08-31 1:27 ` Rafael J. Wysocki
2016-08-31 14:34 ` Peter Zijlstra
2016-09-12 22:25 ` Rafael J. Wysocki
2016-08-26 18:40 ` [PATCH 2/2] sched: cpufreq: use rt_avg as estimate of required RT CPU capacity Steve Muckle
2016-08-31 1:31 ` Rafael J. Wysocki
2016-08-31 14:49 ` Steve Muckle
2016-08-31 14:39 ` Peter Zijlstra
2016-08-31 15:08 ` Steve Muckle
2016-08-31 16:28 ` Thomas Gleixner
2016-08-31 16:40 ` Peter Zijlstra
2016-08-31 17:00 ` Juri Lelli
2016-09-01 7:12 ` Peter Zijlstra [this message]
2016-09-01 21:48 ` Steve Muckle
2016-09-02 9:35 ` Juri Lelli
2016-09-02 12:17 ` Thomas Gleixner
2016-08-31 22:50 ` Rafael J. Wysocki
2016-09-02 8:12 ` Thomas Gleixner
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