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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Ionela Voinescu <ionela.voinescu@arm.com>
Cc: linux-pm@vger.kernel.org, peterz@infradead.org,
	catalin.marinas@arm.com,
	Valentin Schneider <valentin.schneider@arm.com>,
	rjw@rjwysocki.net, linux@armlinux.org.uk,
	linux-kernel@vger.kernel.org, mingo@redhat.com,
	sudeep.holla@arm.com, will@kernel.org, dietmar.eggemann@arm.com,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 7/7] cpufreq: make schedutil the default for arm and arm64
Date: Thu, 30 Jul 2020 10:24:08 +0530
Message-ID: <20200730045408.cpsoymak33jl3bsm@vireshk-mac-ubuntu> (raw)
In-Reply-To: <20200722093732.14297-8-ionela.voinescu@arm.com>

On 22-07-20, 10:37, Ionela Voinescu wrote:
> From: Valentin Schneider <valentin.schneider@arm.com>
> 
> schedutil is already a hard-requirement for EAS, which has lead to making
> it default on arm (when CONFIG_BIG_LITTLE), see:
> 
>   commit 8fdcca8e254a ("cpufreq: Select schedutil when using big.LITTLE")
> 
> One thing worth pointing out is that schedutil isn't only relevant for
> asymmetric CPU capacity systems; for instance, schedutil is the only
> governor that honours util-clamp performance requests. Another good example
> of this is x86 switching to using it by default in:
> 
>   commit a00ec3874e7d ("cpufreq: intel_pstate: Select schedutil as the default governor")
> 
> Arguably it should be made the default for all architectures, but it seems
> better to wait for them to also gain frequency invariance powers. Make it
> the default for arm && arm64 for now.
> 
> Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
> Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> ---
>  drivers/cpufreq/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
> index e91750132552..2c7171e0b001 100644
> --- a/drivers/cpufreq/Kconfig
> +++ b/drivers/cpufreq/Kconfig
> @@ -37,7 +37,7 @@ config CPU_FREQ_STAT
>  choice
>  	prompt "Default CPUFreq governor"
>  	default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
> -	default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if BIG_LITTLE
> +	default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if ARM64 || ARM
>  	default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if X86_INTEL_PSTATE && SMP
>  	default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
>  	help

Applied. Thanks.

-- 
viresh

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Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-22  9:37 [PATCH v2 0/7] cpufreq: improve frequency invariance support Ionela Voinescu
2020-07-22  9:37 ` [PATCH v2 1/7] cpufreq: move invariance setter calls in cpufreq core Ionela Voinescu
2020-07-27 13:48   ` Rafael J. Wysocki
2020-07-29  9:03     ` Ionela Voinescu
2020-07-30  3:41     ` Viresh Kumar
2020-08-03 13:26       ` Ionela Voinescu
2020-08-03 13:46         ` Rafael J. Wysocki
2020-08-03 14:16           ` Ionela Voinescu
2020-07-22  9:37 ` [PATCH v2 2/7] cpufreq: set invariance scale factor on transition end Ionela Voinescu
2020-07-27 13:52   ` Rafael J. Wysocki
2020-07-29  9:14     ` Ionela Voinescu
2020-07-30  4:13   ` Viresh Kumar
2020-08-03 13:58     ` Ionela Voinescu
2020-08-04  6:26       ` Viresh Kumar
2020-08-05 10:35         ` Ionela Voinescu
2020-07-22  9:37 ` [PATCH v2 3/7] arch_topology: disable frequency invariance for CONFIG_BL_SWITCHER Ionela Voinescu
2020-07-30  4:24   ` Viresh Kumar
2020-07-30 10:29     ` Dietmar Eggemann
2020-07-31 15:48       ` Sudeep Holla
2020-08-03 14:39         ` Ionela Voinescu
2020-08-04  6:30       ` Viresh Kumar
2020-08-10  9:01         ` Ionela Voinescu
2020-07-22  9:37 ` [PATCH v2 4/7] cpufreq: report whether cpufreq supports Frequency Invariance (FI) Ionela Voinescu
2020-07-27 14:02   ` Rafael J. Wysocki
2020-07-29 14:39     ` Ionela Voinescu
2020-07-30  4:43   ` Viresh Kumar
2020-08-03 15:24     ` Ionela Voinescu
2020-08-04  6:46       ` Viresh Kumar
2020-08-05 10:35         ` Ionela Voinescu
2020-07-22  9:37 ` [PATCH v2 5/7] arch_topology, cpufreq, sched/core: constify arch_* cpumasks Ionela Voinescu
2020-07-30 11:43   ` Catalin Marinas
2020-07-22  9:37 ` [PATCH v2 6/7] arch_topology, arm, arm64: define arch_scale_freq_invariant() Ionela Voinescu
2020-07-30 11:44   ` [PATCH v2 6/7] arch_topology,arm,arm64: " Catalin Marinas
2020-07-22  9:37 ` [PATCH v2 7/7] cpufreq: make schedutil the default for arm and arm64 Ionela Voinescu
2020-07-30  4:54   ` Viresh Kumar [this message]

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