| /* |
| * Copyright (C) 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. |
| */ |
| |
| package android.os; |
| |
| import android.perftests.utils.BenchmarkState; |
| import android.perftests.utils.PerfStatusReporter; |
| import android.support.test.filters.LargeTest; |
| import android.support.test.runner.AndroidJUnit4; |
| |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| import java.nio.file.Files; |
| import java.nio.file.Paths; |
| |
| |
| /** |
| * Performance tests collecting CPU data different mechanisms. |
| */ |
| @RunWith(AndroidJUnit4.class) |
| @LargeTest |
| public class CpuUsageTrackingPerfTest { |
| @Rule |
| public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter(); |
| |
| @Test |
| public void timeSystemThread() { |
| final BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| Binder b = new Binder(); |
| while (state.keepRunning()) { |
| SystemClock.currentThreadTimeMicro(); |
| } |
| } |
| |
| @Test |
| public void timeReadStatFileDirectly() throws Exception { |
| final BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| // CPU usage by frequency for this pid. Data is in text format. |
| final String procFile = "/proc/self/stat"; |
| while (state.keepRunning()) { |
| byte[] data = Files.readAllBytes(Paths.get(procFile)); |
| } |
| } |
| |
| @Test |
| public void timeReadPidProcDirectly() throws Exception { |
| final BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| // CPU usage by frequency for this pid. Data is in text format. |
| final String procFile = "/proc/self/time_in_state"; |
| while (state.keepRunning()) { |
| byte[] data = Files.readAllBytes(Paths.get(procFile)); |
| } |
| } |
| |
| @Test |
| public void timeReadThreadProcDirectly() throws Exception { |
| final BenchmarkState state = mPerfStatusReporter.getBenchmarkState(); |
| // CPU usage by frequency for this UID. Data is in text format. |
| final String procFile = "/proc/self/task/" + android.os.Process.myTid() |
| + "/time_in_state"; |
| while (state.keepRunning()) { |
| byte[] data = Files.readAllBytes(Paths.get(procFile)); |
| } |
| } |
| } |