SF: Adding statistical mode
- Adding statistical mode for timestamp intervals.
- Moving math calculations into util class, and adding a unit test.
See go/surface-flinger-scheduler for more info and systrace links.
Test: SF tests pass. Adding new test class.
Bug: 113612090
Change-Id: I3c3a73e3d8719e47326d8a48d27683037b7beb47
diff --git a/services/surfaceflinger/tests/unittests/SchedulerUtilsTest.cpp b/services/surfaceflinger/tests/unittests/SchedulerUtilsTest.cpp
new file mode 100644
index 0000000..5865579
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/SchedulerUtilsTest.cpp
@@ -0,0 +1,131 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#undef LOG_TAG
+#define LOG_TAG "SchedulerUnittests"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <array>
+
+#include "Scheduler/SchedulerUtils.h"
+
+namespace android {
+namespace scheduler {
+
+class SchedulerUtilsTest : public testing::Test {
+public:
+ SchedulerUtilsTest() = default;
+ ~SchedulerUtilsTest() override = default;
+};
+
+namespace {
+TEST_F(SchedulerUtilsTest, calculate_mean) {
+ std::array<int64_t, 30> testArray{};
+ // Calling the function on empty array returns 0.
+ EXPECT_EQ(0, calculate_mean(testArray));
+
+ testArray[0] = 33;
+ EXPECT_EQ(1, calculate_mean(testArray));
+ testArray[1] = 33;
+ testArray[2] = 33;
+ EXPECT_EQ(3, calculate_mean(testArray));
+ testArray[3] = 42;
+ EXPECT_EQ(4, calculate_mean(testArray));
+ testArray[4] = 33;
+ EXPECT_EQ(5, calculate_mean(testArray));
+ testArray[5] = 42;
+ EXPECT_EQ(7, calculate_mean(testArray));
+ for (int i = 6; i < 30; i++) {
+ testArray[i] = 33;
+ }
+ EXPECT_EQ(33, calculate_mean(testArray));
+}
+
+TEST_F(SchedulerUtilsTest, calculate_median) {
+ std::vector<int64_t> testVector;
+ // Calling the function on empty vector returns 0.
+ EXPECT_EQ(0, calculate_median(&testVector));
+
+ testVector.push_back(33);
+ EXPECT_EQ(33, calculate_median(&testVector));
+ testVector.push_back(33);
+ testVector.push_back(33);
+ EXPECT_EQ(33, calculate_median(&testVector));
+ testVector.push_back(42);
+ EXPECT_EQ(33, calculate_median(&testVector));
+ testVector.push_back(33);
+ EXPECT_EQ(33, calculate_median(&testVector));
+ testVector.push_back(42);
+ EXPECT_EQ(33, calculate_median(&testVector));
+ testVector.push_back(42);
+ EXPECT_EQ(33, calculate_median(&testVector));
+ testVector.push_back(42);
+ EXPECT_EQ(42, calculate_median(&testVector));
+ testVector.push_back(60);
+ EXPECT_EQ(42, calculate_median(&testVector));
+ testVector.push_back(60);
+ EXPECT_EQ(42, calculate_median(&testVector));
+ testVector.push_back(33);
+ EXPECT_EQ(42, calculate_median(&testVector));
+ testVector.push_back(33);
+ EXPECT_EQ(42, calculate_median(&testVector));
+ testVector.push_back(33);
+ EXPECT_EQ(33, calculate_median(&testVector));
+}
+
+TEST_F(SchedulerUtilsTest, calculate_mode) {
+ std::vector<int64_t> testVector;
+ // Calling the function on empty vector returns 0.
+ EXPECT_EQ(0, calculate_mode(testVector));
+
+ testVector.push_back(33);
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(33);
+ testVector.push_back(33);
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(42);
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(33);
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(42);
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(42);
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(42);
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(60);
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(60);
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(33);
+ // 5 occurences of 33.
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(42);
+ // 5 occurences of 33, 5 occurences of 42. We choose the first one.
+ EXPECT_EQ(33, calculate_mode(testVector));
+ testVector.push_back(42);
+ // 5 occurences of 33, 6 occurences of 42.
+ EXPECT_EQ(42, calculate_mode(testVector));
+ testVector.push_back(42);
+ // 5 occurences of 33, 7 occurences of 42.
+ EXPECT_EQ(42, calculate_mode(testVector));
+}
+
+} // namespace
+} // namespace scheduler
+} // namespace android
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