From: Lukasz Luba <lukasz.luba@arm.com>
To: linux-kernel@vger.kernel.org, kgene@kernel.org, krzk@kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org,
linux-pm@vger.kernel.org
Cc: myungjoo.ham@samsung.com, kyungmin.park@samsung.com,
cw00.choi@samsung.com, robh+dt@kernel.org, mark.rutland@arm.com,
b.zolnierkie@samsung.com, lukasz.luba@arm.com,
dietmar.eggemann@arm.com
Subject: [RESEND PATCH v2 1/2] ARM: dts: exynos: Add dynamic-power-coefficient to Exynos5422 CPUs
Date: Thu, 20 Feb 2020 09:56:35 +0000 [thread overview]
Message-ID: <20200220095636.29469-2-lukasz.luba@arm.com> (raw)
In-Reply-To: <20200220095636.29469-1-lukasz.luba@arm.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@arm.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>;
};
};
};
--
2.17.1
next prev parent reply other threads:[~2020-02-20 9:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-20 9:56 [RESEND PATCH v2 0/2] Enable Odroid-XU3/4 to use Energy Model and Energy Aware Scheduler Lukasz Luba
2020-02-20 9:56 ` Lukasz Luba [this message]
2020-02-20 9:56 ` [RESEND PATCH v2 2/2] ARM: exynos_defconfig: Enable SCHED_MC and ENERGY_MODEL Lukasz Luba
2020-02-20 18:00 ` [RESEND PATCH v2 0/2] Enable Odroid-XU3/4 to use Energy Model and Energy Aware Scheduler Krzysztof Kozlowski
2020-02-21 10:32 ` Lukasz Luba
2020-02-28 10:59 ` Marek Szyprowski
2020-02-28 12:00 ` Lukasz Luba
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