linux-kernel - Re: [PATCH 1/2] ARM: dts: exynos: Add dynamic-power-coefficient to Exynos5422 CPUs

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Date:   Wed, 19 Feb 2020 11:23:04 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     kgene@...nel.org, krzk@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        cw00.choi@...sung.com, robh+dt@...nel.org, mark.rutland@....com,
        b.zolnierkie@...sung.com, dietmar.eggemann@....com
Subject: Re: [PATCH 1/2] ARM: dts: exynos: Add dynamic-power-coefficient to
 Exynos5422 CPUs

My apologizes for the mistake in the subject. It should be
"PATCH v2 1/2" (mistake in script arguments while sending).
The same applies to the second patch, should be  "PATCH v2 2/2".

Regards,
Lukasz

On 2/19/20 9:58 AM, lukasz.luba@....com wrote:
> From: Lukasz Luba <lukasz.luba@....com>
> 
> To use Energy Aware Scheduler (EAS) the Energy Model (EM) should be
> registered for CPUs. Add dynamic-power-coefficient into CPU nodes which
> let CPUFreq subsystem register the EM structures. This will increase
> energy efficiency of big.LITTLE platforms.
> 
> The 'dynamic-power-coefficient' values have been obtained experimenting
> with different workloads. The power measurements taken from big CPU
> Cluster and LITTLE CPU Cluster has been compared with official documents
> and synthetic workloads estimations. The effective power ratio between
> Cortex-A7 and Cortex-A15 CPUs (~3x) is also aligned with documentation.
> 
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---
>   arch/arm/boot/dts/exynos5422-cpus.dtsi | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos5422-cpus.dtsi b/arch/arm/boot/dts/exynos5422-cpus.dtsi
> index 1b8605cf2407..4b641b9b8179 100644
> --- a/arch/arm/boot/dts/exynos5422-cpus.dtsi
> +++ b/arch/arm/boot/dts/exynos5422-cpus.dtsi
> @@ -31,6 +31,7 @@
>   			operating-points-v2 = <&cluster_a7_opp_table>;
>   			#cooling-cells = <2>; /* min followed by max */
>   			capacity-dmips-mhz = <539>;
> +			dynamic-power-coefficient = <90>;
>   		};
>   
>   		cpu1: cpu@101 {
> @@ -43,6 +44,7 @@
>   			operating-points-v2 = <&cluster_a7_opp_table>;
>   			#cooling-cells = <2>; /* min followed by max */
>   			capacity-dmips-mhz = <539>;
> +			dynamic-power-coefficient = <90>;
>   		};
>   
>   		cpu2: cpu@102 {
> @@ -55,6 +57,7 @@
>   			operating-points-v2 = <&cluster_a7_opp_table>;
>   			#cooling-cells = <2>; /* min followed by max */
>   			capacity-dmips-mhz = <539>;
> +			dynamic-power-coefficient = <90>;
>   		};
>   
>   		cpu3: cpu@103 {
> @@ -67,6 +70,7 @@
>   			operating-points-v2 = <&cluster_a7_opp_table>;
>   			#cooling-cells = <2>; /* min followed by max */
>   			capacity-dmips-mhz = <539>;
> +			dynamic-power-coefficient = <90>;
>   		};
>   
>   		cpu4: cpu@0 {
> @@ -79,6 +83,7 @@
>   			operating-points-v2 = <&cluster_a15_opp_table>;
>   			#cooling-cells = <2>; /* min followed by max */
>   			capacity-dmips-mhz = <1024>;
> +			dynamic-power-coefficient = <310>;
>   		};
>   
>   		cpu5: cpu@1 {
> @@ -91,6 +96,7 @@
>   			operating-points-v2 = <&cluster_a15_opp_table>;
>   			#cooling-cells = <2>; /* min followed by max */
>   			capacity-dmips-mhz = <1024>;
> +			dynamic-power-coefficient = <310>;
>   		};
>   
>   		cpu6: cpu@2 {
> @@ -103,6 +109,7 @@
>   			operating-points-v2 = <&cluster_a15_opp_table>;
>   			#cooling-cells = <2>; /* min followed by max */
>   			capacity-dmips-mhz = <1024>;
> +			dynamic-power-coefficient = <310>;
>   		};
>   
>   		cpu7: cpu@3 {
> @@ -115,6 +122,7 @@
>   			operating-points-v2 = <&cluster_a15_opp_table>;
>   			#cooling-cells = <2>; /* min followed by max */
>   			capacity-dmips-mhz = <1024>;
> +			dynamic-power-coefficient = <310>;
>   		};
>   	};
>   };
>