From: Peter Zijlstra <peterz@infradead.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>,
"mingo@redhat.com" <mingo@redhat.com>,
Dietmar Eggemann <Dietmar.Eggemann@arm.com>,
Paul Turner <pjt@google.com>,
Benjamin Segall <bsegall@google.com>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Mike Turquette <mturquette@linaro.org>,
"rjw@rjwysocki.net" <rjw@rjwysocki.net>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/7] sched: Introduce scale-invariant load tracking
Date: Fri, 10 Oct 2014 11:07:43 +0200 [thread overview]
Message-ID: <20141010090743.GE10832@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <CAKfTPtC0vNpg6vKoR_zUCF+ENOmRNDfZDAonSmL23ZYFA=AKNg@mail.gmail.com>
On Wed, Oct 08, 2014 at 01:38:40PM +0200, Vincent Guittot wrote:
> I have in mind some system where the max achievable freq of a core
> depends of how many cores are running simultaneously because of some
> HW constraint like max current. In this case, the CPU might not reach
> max frequency even with an always running task.
> Then, beside frequency scaling, their is the uarch invariance that is
> introduced by patch 4 that will generate similar behavior of the load.
This is a 'common' issue. x86 and powerpc also suffer this. It can be
the result of either thermal or power thresholds.
next prev parent reply other threads:[~2014-10-10 9:07 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-22 16:24 [PATCH 0/7] sched: Scale-invariant per-entity load-tracking Morten Rasmussen
2014-09-22 16:24 ` [PATCH 1/7] sched: Introduce scale-invariant load tracking Morten Rasmussen
2014-09-25 13:48 ` Vincent Guittot
2014-09-25 17:23 ` Morten Rasmussen
2014-09-26 7:36 ` Vincent Guittot
2014-09-26 9:38 ` Morten Rasmussen
2014-10-02 20:34 ` Peter Zijlstra
2014-10-08 11:00 ` Morten Rasmussen
2014-10-08 11:21 ` Vincent Guittot
2014-10-08 13:53 ` Morten Rasmussen
2014-10-08 14:08 ` Vincent Guittot
2014-10-08 14:16 ` Morten Rasmussen
2014-10-08 11:38 ` Vincent Guittot
2014-10-08 14:05 ` Morten Rasmussen
2014-10-10 9:07 ` Peter Zijlstra [this message]
2014-10-08 0:50 ` Yuyang Du
2014-10-08 12:54 ` Dietmar Eggemann
2014-10-10 9:16 ` Peter Zijlstra
2014-10-10 9:14 ` Peter Zijlstra
2014-09-22 16:24 ` [PATCH 2/7] cpufreq: Architecture specific callback for frequency changes Morten Rasmussen
2014-10-08 6:07 ` Mike Turquette
2014-10-08 6:26 ` [PATCH RFC 0/2] introduce capacity_ops to CFS Mike Turquette
2014-10-08 6:26 ` [PATCH RFC 1/2] sched: cfs: introduce capacity_ops Mike Turquette
2014-10-08 8:37 ` Peter Zijlstra
[not found] ` <20141008232836.4379.3339@quantum>
2014-10-09 9:00 ` Peter Zijlstra
[not found] ` <20141009173433.4379.58492@quantum>
2014-10-09 19:00 ` Peter Zijlstra
2014-10-08 6:26 ` [PATCH RFC 2/2] cpufreq: arm_big_little: provide cpu capacity Mike Turquette
2014-10-08 15:48 ` Morten Rasmussen
[not found] ` <20141008223732.4379.78047@quantum>
2014-10-09 9:02 ` Peter Zijlstra
[not found] ` <20141009172513.4379.56718@quantum>
2014-10-09 17:38 ` Peter Zijlstra
2014-09-22 16:24 ` [PATCH 3/7] arm: Frequency invariant scheduler load-tracking support Morten Rasmussen
2014-09-22 16:24 ` [PATCH 4/7] arm: Micro-architecture invariant load tracking support Morten Rasmussen
2014-09-22 16:24 ` [PATCH 5/7] sched: Implement usage tracking Morten Rasmussen
2014-09-22 16:24 ` [PATCH 6/7] sched: Make sched entity usage tracking scale-invariant Morten Rasmussen
2014-09-22 17:13 ` bsegall
2014-09-23 13:35 ` Morten Rasmussen
2014-10-02 21:04 ` Peter Zijlstra
2014-09-22 16:24 ` [PATCH 7/7] sched: Track sched_entity usage contributions Morten Rasmussen
2014-09-22 17:09 ` bsegall
2014-09-23 13:59 ` Morten Rasmussen
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