diff --git a/libs/hwui/tests/scripts/prep_buller.sh b/libs/hwui/tests/scripts/prep_buller.sh
new file mode 100755
index 0000000000000..7b3b140b4a7d1
--- /dev/null
+++ b/libs/hwui/tests/scripts/prep_buller.sh
@@ -0,0 +1,61 @@
+#buller is bullhead & angler  (☞ﾟヮﾟ)☞
+
+nr=$(adb shell cat /proc/cpuinfo | grep processor | wc -l)
+cpubase=/sys/devices/system/cpu
+gov=cpufreq/scaling_governor
+
+adb root
+adb wait-for-device
+
+adb shell stop
+adb shell stop thermal-engine
+adb shell stop perfd
+
+for pid in $( adb shell ps | awk '{ if ( $9 == "surfaceflinger" ) { print $2 } }' ); do
+    adb shell kill $pid
+done
+adb shell setprop debug.egl.traceGpuCompletion 1
+adb shell daemonize surfaceflinger
+sleep 3
+adb shell setprop service.bootanim.exit 1
+
+# LITTLE cores
+# 384000 460800 600000 672000 787200 864000 960000 1248000 1440000
+# BIG cores
+# 384000 480000 633600 768000 864000 960000 1248000 1344000 1440000
+# 1536000 1632000 1689600 1824000
+
+cpu=0
+S=960000
+while [ $((cpu < 4)) -eq 1 ]; do
+    echo "Setting cpu $cpu to $S hz";
+    adb shell "echo 1 > $cpubase/cpu${cpu}/online";
+    adb shell "echo userspace > $cpubase/cpu${cpu}/$gov";
+    adb shell "echo $S > $cpubase/cpu${cpu}/cpufreq/scaling_max_freq";
+    adb shell "echo $S > $cpubase/cpu${cpu}/cpufreq/scaling_min_freq";
+    adb shell "echo $S > $cpubase/cpu${cpu}/cpufreq/scaling_setspeed";
+    cpu=$(($cpu + 1));
+done
+
+while [ $((cpu < $nr)) -eq 1 ]; do
+  echo "disable cpu $cpu";
+  adb shell "echo 0 > $cpubase/cpu${cpu}/online";
+  cpu=$(($cpu + 1));
+done
+
+echo "setting GPU bus and idle timer"
+adb shell "echo 0 > /sys/class/kgsl/kgsl-3d0/bus_split"
+adb shell "echo 1 > /sys/class/kgsl/kgsl-3d0/force_clk_on"
+adb shell "echo 10000 > /sys/class/kgsl/kgsl-3d0/idle_timer"
+
+#0 762 1144 1525 2288 3509 4173 5271 5928 7904 9887 11863
+adb shell "echo 11863 > /sys/class/devfreq/qcom,gpubw.70/min_freq";
+
+#600000000 510000000 450000000 390000000 305000000 180000000
+echo "performance mode, 305 MHz"
+adb shell "echo performance > /sys/class/kgsl/kgsl-3d0/devfreq/governor";
+adb shell "echo 305000000 > /sys/class/kgsl/kgsl-3d0/devfreq/min_freq";
+adb shell "echo 305000000 > /sys/class/kgsl/kgsl-3d0/devfreq/max_freq";
+
+echo "adb shell \"cat /sys/class/kgsl/kgsl-3d0/devfreq/cur_freq\""
+adb shell "cat /sys/class/kgsl/kgsl-3d0/devfreq/cur_freq";