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From: Qais Yousef <qais.yousef@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Julia Lawall <julia.lawall@inria.fr>,
	Mel Gorman <mgorman@suse.de>, Ingo Molnar <mingo@redhat.com>,
	kernel-janitors@vger.kernel.org,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	linux-kernel@vger.kernel.org,
	Valentin Schneider <valentin.schneider@arm.com>,
	Gilles Muller <Gilles.Muller@inria.fr>,
	srinivas.pandruvada@linux.intel.com
Subject: Re: default cpufreq gov, was: [PATCH] sched/fair: check for idle core
Date: Tue, 27 Oct 2020 11:11:33 +0000	[thread overview]
Message-ID: <20201027111133.ajlxn5lbnfeocfgb@e107158-lin> (raw)
In-Reply-To: <20201022120213.GG2611@hirez.programming.kicks-ass.net>

On 10/22/20 14:02, Peter Zijlstra wrote:
> On Thu, Oct 22, 2020 at 01:45:25PM +0200, Rafael J. Wysocki wrote:
> > On Thursday, October 22, 2020 12:47:03 PM CEST Viresh Kumar wrote:
> > > On 22-10-20, 09:11, Peter Zijlstra wrote:
> > > > Well, but we need to do something to force people onto schedutil,
> > > > otherwise we'll get more crap like this thread.
> > > > 
> > > > Can we take the choice away? Only let Kconfig select which governors are
> > > > available and then set the default ourselves? I mean, the end goal being
> > > > to not have selectable governors at all, this seems like a good step
> > > > anyway.
> > > 
> > > Just to clarify and complete the point a bit here, the users can still
> > > pass the default governor from cmdline using
> > > cpufreq.default_governor=, which will take precedence over the one the
> > > below code is playing with. And later once the kernel is up, they can
> > > still choose a different governor from userspace.
> > 
> > Right.
> > 
> > Also some people simply set "performance" as the default governor and then
> > don't touch cpufreq otherwise (the idea is to get everything to the max
> > freq right away and stay in that mode forever).  This still needs to be
> > possible IMO.
> 
> Performance/powersave make sense to keep.
> 
> However I do want to retire ondemand, conservative and also very much
> intel_pstate/active mode. I also have very little sympathy for
> userspace.

Userspace is useful for testing and sanity checking. Not sure if people use it
to measure voltage/current at each frequency to generate
dynamic-power-coefficient for their platform. Lukasz, Dietmar?

Thanks

--
Qais Yousef

> 
> We should start by making it hard to use them and eventually just delete
> them outright.
> 

  parent reply	other threads:[~2020-10-27 11:11 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-20 16:37 [PATCH] sched/fair: check for idle core Julia Lawall
2020-10-21  7:29 ` Vincent Guittot
2020-10-21 11:13   ` Peter Zijlstra
2020-10-21 12:27   ` Vincent Guittot
2020-10-21 11:20 ` Mel Gorman
2020-10-21 11:56   ` Julia Lawall
2020-10-21 12:19     ` Peter Zijlstra
2020-10-21 12:42       ` Julia Lawall
2020-10-21 12:52         ` Peter Zijlstra
2020-10-21 18:18           ` Rafael J. Wysocki
2020-10-21 18:15         ` Rafael J. Wysocki
2020-10-21 19:47           ` Julia Lawall
2020-10-21 20:25             ` Rafael J. Wysocki
2020-10-21 13:10       ` Peter Zijlstra
2020-10-21 18:11         ` Rafael J. Wysocki
2020-10-22  4:53           ` Viresh Kumar
2020-10-22  7:11           ` Peter Zijlstra
2020-10-22 10:59             ` Viresh Kumar
2020-10-22 11:45               ` Rafael J. Wysocki
2020-10-22 12:02                 ` default cpufreq gov, was: " Peter Zijlstra
2020-10-22 12:19                   ` Rafael J. Wysocki
2020-10-22 12:29                     ` Peter Zijlstra
2020-10-22 14:52                       ` Mel Gorman
2020-10-22 14:58                         ` Colin Ian King
2020-10-22 15:12                           ` Phil Auld
2020-10-22 16:35                             ` Mel Gorman
2020-10-22 17:59                               ` Rafael J. Wysocki
2020-10-22 20:32                                 ` Mel Gorman
2020-10-22 20:39                                   ` Phil Auld
2020-10-22 15:25                         ` Peter Zijlstra
2020-10-22 15:55                           ` Rafael J. Wysocki
2020-10-22 16:29                           ` Mel Gorman
2020-10-22 20:10                           ` Giovanni Gherdovich
2020-10-22 20:16                             ` Giovanni Gherdovich
2020-10-23  7:03                             ` Peter Zijlstra
2020-10-23 17:46                               ` Tom Lendacky
2020-10-26 19:52                                 ` Fontenot, Nathan
2020-10-22 15:45                       ` A L
2020-10-22 15:55                         ` Vincent Guittot
2020-10-23  5:23                           ` Viresh Kumar
2020-10-22 16:23                   ` [PATCH] cpufreq: Avoid configuring old governors as default with intel_pstate Rafael J. Wysocki
2020-10-23  6:29                     ` Viresh Kumar
2020-10-23 11:59                       ` Rafael J. Wysocki
2020-10-23 15:15                     ` [PATCH v2] " Rafael J. Wysocki
2020-10-27  3:13                       ` Viresh Kumar
2020-10-27 11:11                   ` Qais Yousef [this message]
2020-10-27 11:26                     ` default cpufreq gov, was: [PATCH] sched/fair: check for idle core Valentin Schneider
2020-10-27 11:42                       ` Qais Yousef
2020-10-27 11:48                         ` Viresh Kumar
2020-10-23  6:24                 ` Viresh Kumar
2020-10-23 15:06                   ` Rafael J. Wysocki
2020-10-27  3:13                     ` Viresh Kumar
2020-10-22 11:21             ` AW: " Walter Harms
2020-10-21 12:28     ` Mel Gorman
2020-10-21 12:25   ` Vincent Guittot
2020-10-21 12:47     ` Mel Gorman
2020-10-21 12:56       ` Julia Lawall
2020-10-21 13:18         ` Mel Gorman
2020-10-21 13:24           ` Julia Lawall
2020-10-21 15:08             ` Mel Gorman
2020-10-21 15:18               ` Julia Lawall
2020-10-21 15:23                 ` Vincent Guittot
2020-10-21 15:33                   ` Julia Lawall
2020-10-21 15:19               ` Vincent Guittot
2020-10-21 17:00                 ` Mel Gorman
2020-10-21 17:39                   ` Julia Lawall
2020-10-21 13:48           ` Julia Lawall
2020-10-21 15:26             ` Mel Gorman

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