The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 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 com.android.server.am; |
| 18 | |
Joe Onorato | 8a9b220 | 2010-02-26 18:56:32 -0800 | [diff] [blame] | 19 | import android.util.Slog; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 20 | |
| 21 | import java.io.*; |
| 22 | import java.util.Arrays; |
| 23 | |
| 24 | /** |
| 25 | * Monitors device resources periodically for some period of time. Useful for |
| 26 | * tracking down performance problems. |
| 27 | */ |
| 28 | class DeviceMonitor { |
| 29 | |
| 30 | private static final String LOG_TAG = DeviceMonitor.class.getName(); |
| 31 | |
| 32 | /** Number of samples to take. */ |
| 33 | private static final int SAMPLE_COUNT = 10; |
| 34 | |
| 35 | /** Time to wait in ms between samples. */ |
| 36 | private static final int INTERVAL = 1000; |
| 37 | |
| 38 | /** Time to wait in ms between samples. */ |
| 39 | private static final int MAX_FILES = 30; |
| 40 | |
| 41 | private final byte[] buffer = new byte[1024]; |
| 42 | |
| 43 | /** Is the monitor currently running? */ |
| 44 | private boolean running = false; |
| 45 | |
| 46 | private DeviceMonitor() { |
| 47 | new Thread() { |
| 48 | public void run() { |
| 49 | monitor(); |
| 50 | } |
| 51 | }.start(); |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Loops continuously. Pauses until someone tells us to start monitoring. |
| 56 | */ |
| 57 | @SuppressWarnings("InfiniteLoopStatement") |
| 58 | private void monitor() { |
| 59 | while (true) { |
| 60 | waitForStart(); |
| 61 | |
| 62 | purge(); |
| 63 | |
| 64 | for (int i = 0; i < SAMPLE_COUNT; i++) { |
| 65 | try { |
| 66 | dump(); |
| 67 | } catch (IOException e) { |
Joe Onorato | 8a9b220 | 2010-02-26 18:56:32 -0800 | [diff] [blame] | 68 | Slog.w(LOG_TAG, "Dump failed.", e); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 69 | } |
| 70 | pause(); |
| 71 | } |
| 72 | |
| 73 | stop(); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | private static final File PROC = new File("/proc"); |
| 78 | private static final File BASE = new File("/data/anr/"); |
| 79 | static { |
| 80 | if (!BASE.isDirectory() && !BASE.mkdirs()) { |
| 81 | throw new AssertionError("Couldn't create " + BASE + "."); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | private static final File[] PATHS = { |
| 86 | new File(PROC, "zoneinfo"), |
| 87 | new File(PROC, "interrupts"), |
| 88 | new File(PROC, "meminfo"), |
| 89 | new File(PROC, "slabinfo"), |
| 90 | }; |
| 91 | |
| 92 | |
| 93 | /** |
| 94 | * Deletes old files. |
| 95 | */ |
| 96 | private void purge() { |
| 97 | File[] files = BASE.listFiles(); |
| 98 | int count = files.length - MAX_FILES; |
| 99 | if (count > 0) { |
| 100 | Arrays.sort(files); |
| 101 | for (int i = 0; i < count; i++) { |
| 102 | if (!files[i].delete()) { |
Joe Onorato | 8a9b220 | 2010-02-26 18:56:32 -0800 | [diff] [blame] | 103 | Slog.w(LOG_TAG, "Couldn't delete " + files[i] + "."); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 104 | } |
| 105 | } |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Dumps the current device stats to a new file. |
| 111 | */ |
| 112 | private void dump() throws IOException { |
| 113 | OutputStream out = new FileOutputStream( |
| 114 | new File(BASE, String.valueOf(System.currentTimeMillis()))); |
| 115 | try { |
| 116 | // Copy /proc/*/stat |
| 117 | for (File processDirectory : PROC.listFiles()) { |
| 118 | if (isProcessDirectory(processDirectory)) { |
| 119 | dump(new File(processDirectory, "stat"), out); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | // Copy other files. |
| 124 | for (File file : PATHS) { |
| 125 | dump(file, out); |
| 126 | } |
| 127 | } finally { |
| 128 | closeQuietly(out); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * Returns true if the given file represents a process directory. |
| 134 | */ |
| 135 | private static boolean isProcessDirectory(File file) { |
| 136 | try { |
| 137 | Integer.parseInt(file.getName()); |
| 138 | return file.isDirectory(); |
| 139 | } catch (NumberFormatException e) { |
| 140 | return false; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Copies from a file to an output stream. |
| 146 | */ |
| 147 | private void dump(File from, OutputStream out) throws IOException { |
| 148 | writeHeader(from, out); |
| 149 | |
| 150 | FileInputStream in = null; |
| 151 | try { |
| 152 | in = new FileInputStream(from); |
| 153 | int count; |
| 154 | while ((count = in.read(buffer)) != -1) { |
| 155 | out.write(buffer, 0, count); |
| 156 | } |
| 157 | } finally { |
| 158 | closeQuietly(in); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * Writes a header for the given file. |
| 164 | */ |
| 165 | private static void writeHeader(File file, OutputStream out) |
| 166 | throws IOException { |
| 167 | String header = "*** " + file.toString() + "\n"; |
| 168 | out.write(header.getBytes()); |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Closes the given resource. Logs exceptions. |
| 173 | * @param closeable |
| 174 | */ |
| 175 | private static void closeQuietly(Closeable closeable) { |
| 176 | try { |
| 177 | if (closeable != null) { |
| 178 | closeable.close(); |
| 179 | } |
| 180 | } catch (IOException e) { |
Joe Onorato | 8a9b220 | 2010-02-26 18:56:32 -0800 | [diff] [blame] | 181 | Slog.w(LOG_TAG, e); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 182 | } |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * Pauses momentarily before we start the next dump. |
| 187 | */ |
| 188 | private void pause() { |
| 189 | try { |
| 190 | Thread.sleep(INTERVAL); |
| 191 | } catch (InterruptedException e) { /* ignore */ } |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Stops dumping. |
| 196 | */ |
| 197 | private synchronized void stop() { |
| 198 | running = false; |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Waits until someone starts us. |
| 203 | */ |
| 204 | private synchronized void waitForStart() { |
| 205 | while (!running) { |
| 206 | try { |
| 207 | wait(); |
| 208 | } catch (InterruptedException e) { /* ignore */ } |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Instructs the monitoring to start if it hasn't already. |
| 214 | */ |
| 215 | private synchronized void startMonitoring() { |
| 216 | if (!running) { |
| 217 | running = true; |
| 218 | notifyAll(); |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | private static DeviceMonitor instance = new DeviceMonitor(); |
| 223 | |
| 224 | /** |
| 225 | * Starts monitoring if it hasn't started already. |
| 226 | */ |
| 227 | static void start() { |
| 228 | instance.startMonitoring(); |
| 229 | } |
| 230 | } |