From: Patrick Bellasi <patrick.bellasi@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
Ingo Molnar <mingo@redhat.com>, Tejun Heo <tj@kernel.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>,
Quentin Perret <quentin.perret@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Todd Kjos <tkjos@google.com>, Joel Fernandes <joelaf@google.com>,
Steve Muckle <smuckle@google.com>,
Suren Baghdasaryan <surenb@google.com>
Subject: Re: [PATCH v4 14/16] sched/core: uclamp: request CAP_SYS_ADMIN by default
Date: Mon, 24 Sep 2018 18:23:51 +0100 [thread overview]
Message-ID: <20180924172351.GV1413@e110439-lin> (raw)
In-Reply-To: <20180924155616.GA7060@hirez.programming.kicks-ass.net>
On 24-Sep 17:56, Peter Zijlstra wrote:
> On Mon, Sep 24, 2018 at 04:14:00PM +0100, Patrick Bellasi wrote:
> > On 21-Sep 11:13, Peter Zijlstra wrote:
> > > Laptops with active cooling however...
> >
> > How do you see active cooling playing a role ?
> >
> > Are you thinking, for example, at reduced fan noise if we remain below
> > a certain OPP ?
> >
> > Are you factoring fans power consumptions into the overall P consumption ?
>
> Nothing as fancy as that; I just figured that with a larger cooling
> capacity, you can push chips higher onto that curve past the optimal
> IPC/Watt point. Make it go fast etc..
That very concept of "optimal IPC/Watt" point is not something easy to
define considering a monotonic function and without considering the
specific optimization goals.
It really sounds like saying that an LP problem has a unique solution
independently from the optimization function.
Do you think we should "mandate" an optimization function from kernel
space? I'm not saying it does not make sense, but I find it at least a
strong implementation enforcement.
--
#include <best/regards.h>
Patrick Bellasi
next prev parent reply other threads:[~2018-09-24 17:24 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-28 13:53 [PATCH v4 00/16] Add utilization clamping support Patrick Bellasi
2018-08-28 13:53 ` Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 01/16] sched/core: uclamp: extend sched_setattr to support utilization clamping Patrick Bellasi
2018-09-05 11:01 ` Juri Lelli
2018-08-28 13:53 ` [PATCH v4 02/16] sched/core: uclamp: map TASK's clamp values into CPU's clamp groups Patrick Bellasi
2018-09-05 10:45 ` Juri Lelli
2018-09-06 13:48 ` Patrick Bellasi
2018-09-06 14:13 ` Juri Lelli
2018-09-06 8:17 ` Juri Lelli
2018-09-06 14:00 ` Patrick Bellasi
2018-09-08 23:47 ` Suren Baghdasaryan
2018-09-12 10:32 ` Patrick Bellasi
2018-09-12 13:49 ` Peter Zijlstra
2018-09-12 15:56 ` Patrick Bellasi
2018-09-12 16:12 ` Peter Zijlstra
2018-09-12 17:35 ` Patrick Bellasi
2018-09-12 17:42 ` Peter Zijlstra
2018-09-12 17:52 ` Patrick Bellasi
2018-09-13 19:14 ` Peter Zijlstra
2018-09-14 8:51 ` Patrick Bellasi
2018-09-12 16:24 ` Peter Zijlstra
2018-09-12 17:42 ` Patrick Bellasi
2018-09-13 19:20 ` Peter Zijlstra
2018-09-14 8:47 ` Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 03/16] sched/core: uclamp: add CPU's clamp groups accounting Patrick Bellasi
2018-09-12 17:34 ` Peter Zijlstra
2018-09-12 17:44 ` Patrick Bellasi
2018-09-13 19:12 ` Peter Zijlstra
2018-09-14 9:07 ` Patrick Bellasi
2018-09-14 11:52 ` Peter Zijlstra
2018-09-14 13:41 ` Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 04/16] sched/core: uclamp: update CPU's refcount on clamp changes Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 05/16] sched/core: uclamp: enforce last task UCLAMP_MAX Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 06/16] sched/cpufreq: uclamp: add utilization clamping for FAIR tasks Patrick Bellasi
2018-09-14 9:32 ` Peter Zijlstra
2018-09-14 13:19 ` Patrick Bellasi
2018-09-14 13:36 ` Peter Zijlstra
2018-09-14 13:57 ` Patrick Bellasi
2018-09-27 10:23 ` Quentin Perret
2018-08-28 13:53 ` [PATCH v4 07/16] sched/core: uclamp: extend cpu's cgroup controller Patrick Bellasi
2018-08-28 18:29 ` Randy Dunlap
2018-08-29 8:53 ` Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 08/16] sched/core: uclamp: propagate parent clamps Patrick Bellasi
2018-09-09 3:02 ` Suren Baghdasaryan
2018-09-12 12:51 ` Patrick Bellasi
2018-09-12 15:56 ` Suren Baghdasaryan
2018-09-11 15:18 ` Tejun Heo
2018-09-11 16:26 ` Patrick Bellasi
2018-09-11 16:28 ` Tejun Heo
2018-08-28 13:53 ` [PATCH v4 09/16] sched/core: uclamp: map TG's clamp values into CPU's clamp groups Patrick Bellasi
2018-09-09 18:52 ` Suren Baghdasaryan
2018-09-12 14:19 ` Patrick Bellasi
2018-09-12 15:53 ` Suren Baghdasaryan
2018-08-28 13:53 ` [PATCH v4 10/16] sched/core: uclamp: use TG's clamps to restrict Task's clamps Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 11/16] sched/core: uclamp: add system default clamps Patrick Bellasi
2018-09-10 16:20 ` Suren Baghdasaryan
2018-09-11 16:46 ` Patrick Bellasi
2018-09-11 19:25 ` Suren Baghdasaryan
2018-08-28 13:53 ` [PATCH v4 12/16] sched/core: uclamp: update CPU's refcount on TG's clamp changes Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 13/16] sched/core: uclamp: use percentage clamp values Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 14/16] sched/core: uclamp: request CAP_SYS_ADMIN by default Patrick Bellasi
2018-09-04 13:47 ` Juri Lelli
2018-09-06 14:40 ` Patrick Bellasi
2018-09-06 14:59 ` Juri Lelli
2018-09-06 17:21 ` Patrick Bellasi
2018-09-14 11:10 ` Peter Zijlstra
2018-09-14 14:07 ` Patrick Bellasi
2018-09-14 14:28 ` Peter Zijlstra
2018-09-17 12:27 ` Patrick Bellasi
2018-09-21 9:13 ` Peter Zijlstra
2018-09-24 15:14 ` Patrick Bellasi
2018-09-24 15:56 ` Peter Zijlstra
2018-09-24 17:23 ` Patrick Bellasi [this message]
2018-09-24 16:26 ` Peter Zijlstra
2018-09-24 17:19 ` Patrick Bellasi
2018-09-25 15:49 ` Peter Zijlstra
2018-09-26 10:43 ` Patrick Bellasi
2018-09-27 10:00 ` Quentin Perret
2018-09-26 17:51 ` Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 15/16] sched/core: uclamp: add clamp group discretization support Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 16/16] sched/cpufreq: uclamp: add utilization clamping for RT tasks Patrick Bellasi
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