1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import android.os.SystemClock;
import android.util.Log;
import android.util.SparseArray;
import org.mozilla.gecko.annotation.WrapForJNI;
import java.lang.Thread;
import java.util.Set;
public class GeckoJavaSampler {
private static final String LOGTAG = "JavaSampler";
private static Thread sSamplingThread;
private static SamplingThread sSamplingRunnable;
private static Thread sMainThread;
// Use the same timer primitive as the profiler
// to get a perfect sample syncing.
@WrapForJNI
private static native double getProfilerTime();
private static class Sample {
public Frame[] mFrames;
public double mTime;
public long mJavaTime; // non-zero if Android system time is used
public Sample(StackTraceElement[] aStack) {
mFrames = new Frame[aStack.length];
if (GeckoThread.isStateAtLeast(GeckoThread.State.LIBS_READY)) {
mTime = getProfilerTime();
}
if (mTime == 0.0d) {
// getProfilerTime is not available yet; either libs are not loaded,
// or profiling hasn't started on the Gecko side yet
mJavaTime = SystemClock.elapsedRealtime();
}
for (int i = 0; i < aStack.length; i++) {
mFrames[aStack.length - 1 - i] = new Frame();
mFrames[aStack.length - 1 - i].fileName = aStack[i].getFileName();
mFrames[aStack.length - 1 - i].lineNo = aStack[i].getLineNumber();
mFrames[aStack.length - 1 - i].methodName = aStack[i].getMethodName();
mFrames[aStack.length - 1 - i].className = aStack[i].getClassName();
}
}
}
private static class Frame {
public String fileName;
public int lineNo;
public String methodName;
public String className;
}
private static class SamplingThread implements Runnable {
private final int mInterval;
private final int mSampleCount;
private boolean mPauseSampler;
private boolean mStopSampler;
private final SparseArray<Sample[]> mSamples = new SparseArray<Sample[]>();
private int mSamplePos;
public SamplingThread(final int aInterval, final int aSampleCount) {
// If we sample faster then 10ms we get to many missed samples
mInterval = Math.max(10, aInterval);
mSampleCount = aSampleCount;
}
@Override
public void run() {
synchronized (GeckoJavaSampler.class) {
mSamples.put(0, new Sample[mSampleCount]);
mSamplePos = 0;
// Find the main thread
Set<Thread> threadSet = Thread.getAllStackTraces().keySet();
for (Thread t : threadSet) {
if (t.getName().compareToIgnoreCase("main") == 0) {
sMainThread = t;
break;
}
}
if (sMainThread == null) {
Log.e(LOGTAG, "Main thread not found");
return;
}
}
while (true) {
try {
Thread.sleep(mInterval);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (GeckoJavaSampler.class) {
if (!mPauseSampler) {
StackTraceElement[] bt = sMainThread.getStackTrace();
mSamples.get(0)[mSamplePos] = new Sample(bt);
mSamplePos = (mSamplePos + 1) % mSamples.get(0).length;
}
if (mStopSampler) {
break;
}
}
}
}
private Sample getSample(int aThreadId, int aSampleId) {
if (aThreadId < mSamples.size() && aSampleId < mSamples.get(aThreadId).length &&
mSamples.get(aThreadId)[aSampleId] != null) {
int startPos = 0;
if (mSamples.get(aThreadId)[mSamplePos] != null) {
startPos = mSamplePos;
}
int readPos = (startPos + aSampleId) % mSamples.get(aThreadId).length;
return mSamples.get(aThreadId)[readPos];
}
return null;
}
}
@WrapForJNI
public synchronized static String getThreadName(int aThreadId) {
if (aThreadId == 0 && sMainThread != null) {
return sMainThread.getName();
}
return null;
}
private synchronized static Sample getSample(int aThreadId, int aSampleId) {
return sSamplingRunnable.getSample(aThreadId, aSampleId);
}
@WrapForJNI
public synchronized static double getSampleTime(int aThreadId, int aSampleId) {
Sample sample = getSample(aThreadId, aSampleId);
if (sample != null) {
if (sample.mJavaTime != 0) {
return (sample.mJavaTime -
SystemClock.elapsedRealtime()) + getProfilerTime();
}
System.out.println("Sample: " + sample.mTime);
return sample.mTime;
}
return 0;
}
@WrapForJNI
public synchronized static String getFrameName(int aThreadId, int aSampleId, int aFrameId) {
Sample sample = getSample(aThreadId, aSampleId);
if (sample != null && aFrameId < sample.mFrames.length) {
Frame frame = sample.mFrames[aFrameId];
if (frame == null) {
return null;
}
return frame.className + "." + frame.methodName + "()";
}
return null;
}
@WrapForJNI
public static void start(int aInterval, int aSamples) {
synchronized (GeckoJavaSampler.class) {
if (sSamplingRunnable != null) {
return;
}
sSamplingRunnable = new SamplingThread(aInterval, aSamples);
sSamplingThread = new Thread(sSamplingRunnable, "Java Sampler");
sSamplingThread.start();
}
}
@WrapForJNI
public static void pause() {
synchronized (GeckoJavaSampler.class) {
sSamplingRunnable.mPauseSampler = true;
}
}
@WrapForJNI
public static void unpause() {
synchronized (GeckoJavaSampler.class) {
sSamplingRunnable.mPauseSampler = false;
}
}
@WrapForJNI
public static void stop() {
synchronized (GeckoJavaSampler.class) {
if (sSamplingThread == null) {
return;
}
sSamplingRunnable.mStopSampler = true;
try {
sSamplingThread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
sSamplingThread = null;
sSamplingRunnable = null;
}
}
}
|
