linux-kernel - Re: [RFC][PATCH v0.1 5/6] sched/topology: Allow .setpolicy() cpufreq drivers to enable EAS

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Message-ID: <20241119173702.GA27509@noisy.programming.kicks-ass.net>
Date: Tue, 19 Nov 2024 18:37:02 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Christian Loehle <christian.loehle@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux PM <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Lukasz Luba <lukasz.luba@....com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Len Brown <len.brown@...el.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Subject: Re: [RFC][PATCH v0.1 5/6] sched/topology: Allow .setpolicy() cpufreq
 drivers to enable EAS

On Mon, Nov 11, 2024 at 02:54:43PM +0100, Rafael J. Wysocki wrote:

> Or what about ondemand?  Is it alway completely broken with EAS?

I thought that thing was mostly considered broken anyway :-)

> > For plain (non-intel_pstate) powersave and performance we could replace
> > sugov_effective_cpu_perf()
> > that determines the OPP of the perf-domain by the OPP they will be
> > choosing, but for the rest?
> 
> I generally think that depending on schedutil for EAS is a mistake.

Well, the thinking was that we wanted to move to a single governor, and
not proliferate things.