1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package libcore.heapdumper;
18 
19 import android.app.ActivityManager;
20 import android.os.Debug;
21 import android.os.Process;
22 import android.util.Log;
23 
24 import java.io.File;
25 import java.io.FileOutputStream;
26 import java.io.IOException;
27 import java.io.OutputStreamWriter;
28 import java.nio.charset.Charset;
29 import java.nio.charset.StandardCharsets;
30 
31 /**
32  * A specialization of {@link AbstractMetricInstrumentation} where the measurement taken is the
33  * process's total PSS in kB.
34  */
35 public class PssInstrumentation extends AbstractMetricInstrumentation {
36 
37     private static final String TAG = "PssInstrumentation";
38 
39     @Override
takeMeasurement(String label)40     protected void takeMeasurement(String label) throws IOException {
41         ActivityManager activityManager = getContext().getSystemService(ActivityManager.class);
42         tryRemoveGarbage();
43         int totalPssKb = Math.toIntExact(Debug.getPss());
44         File output = resolveRelativeOutputFilename(label + ".pss.txt");
45         Charset cs = StandardCharsets.UTF_8;
46         try (OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(output), cs)) {
47             writer.append(Integer.toString(totalPssKb));
48         }
49         Log.i(TAG, "Wrote to total PSS of " + totalPssKb + " kB to " + output.getCanonicalPath());
50     }
51 }
52