@@ -42,11 +42,28 @@
};
};
+ cpu0: cpu@0 {
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu1: cpu@1 {
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu2: cpu@2 {
+ capacity-dmips-mhz = <1024>;
+ };
+
+ cpu3: cpu@3 {
+ capacity-dmips-mhz = <1024>;
+ };
+
cpu4: cpu@100 {
device_type = "cpu";
compatible = "arm,cortex-a53";
reg = <0x0 0x100>;
enable-method = "psci";
+ capacity-dmips-mhz = <1024>;
next-level-cache = <&l2>;
clocks = <&scpi_dvfs 1>;
#cooling-cells = <2>;
@@ -57,6 +74,7 @@
compatible = "arm,cortex-a53";
reg = <0x0 0x101>;
enable-method = "psci";
+ capacity-dmips-mhz = <1024>;
next-level-cache = <&l2>;
clocks = <&scpi_dvfs 1>;
#cooling-cells = <2>;
@@ -67,6 +85,7 @@
compatible = "arm,cortex-a53";
reg = <0x0 0x102>;
enable-method = "psci";
+ capacity-dmips-mhz = <1024>;
next-level-cache = <&l2>;
clocks = <&scpi_dvfs 1>;
#cooling-cells = <2>;
@@ -77,6 +96,7 @@
compatible = "arm,cortex-a53";
reg = <0x0 0x103>;
enable-method = "psci";
+ capacity-dmips-mhz = <1024>;
next-level-cache = <&l2>;
clocks = <&scpi_dvfs 1>;
#cooling-cells = <2>;
GXM (S912) is a big-little design with CPUs 0-3 clocked at 1.5GHz and CPUs 4-7 at 1.0GHz. Adding capacity-dmips-mhz attributes allows the scheduler to factor the different clock speeds into capacity calculations and prefer the higher-clocked cluster to improve overall performance. This was inspired by the similar change for G12B [0] boards. The diference here is that all cores are A53's so the same dmips-mhz value is used. VIM2:~ # cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq 1512000 1512000 1512000 1512000 1000000 1000000 1000000 1000000 before: VIM2:~ # cat /sys/devices/system/cpu/cpu*/cpu_capacity 1024 1024 1024 1024 1024 1024 1024 1024 after: VIM2:~ # cat /sys/devices/system/cpu/cpu*/cpu_capacity 1024 1024 1024 1024 677 677 677 677 The after value matches my table-napkin calculation: (1000000 / 1512000 = 0.661) * 1024 = 677 [0] https://github.com/torvalds/linux/commit/6eeaf4d2452ec8b1ece58776812140734fc2e088 Signed-off-by: Christian Hewitt <christianshewitt@gmail.com> --- arch/arm64/boot/dts/amlogic/meson-gxm.dtsi | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)