Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 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 com.android.server.wm; |
| 18 | |
Vishnu Nair | ab25003 | 2017-11-21 07:32:43 -0800 | [diff] [blame] | 19 | import static android.os.Build.IS_USER; |
Nataniel Borges | 5a38bad | 2019-01-03 10:32:03 -0800 | [diff] [blame] | 20 | |
Yi Jin | 6c6e9ca | 2018-03-20 16:53:35 -0700 | [diff] [blame] | 21 | import static com.android.server.wm.WindowManagerTraceFileProto.ENTRY; |
Yi Jin | 6c6e9ca | 2018-03-20 16:53:35 -0700 | [diff] [blame] | 22 | import static com.android.server.wm.WindowManagerTraceProto.ELAPSED_REALTIME_NANOS; |
| 23 | import static com.android.server.wm.WindowManagerTraceProto.WHERE; |
| 24 | import static com.android.server.wm.WindowManagerTraceProto.WINDOW_MANAGER_SERVICE; |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 25 | |
Nataniel Borges | 5a38bad | 2019-01-03 10:32:03 -0800 | [diff] [blame] | 26 | import android.annotation.Nullable; |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 27 | import android.os.ShellCommand; |
| 28 | import android.os.SystemClock; |
| 29 | import android.os.Trace; |
| 30 | import android.util.Log; |
| 31 | import android.util.proto.ProtoOutputStream; |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 32 | import android.view.Choreographer; |
| 33 | |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 34 | import java.io.File; |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 35 | import java.io.IOException; |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 36 | import java.io.PrintWriter; |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 37 | |
| 38 | /** |
| 39 | * A class that allows window manager to dump its state continuously to a trace file, such that a |
| 40 | * time series of window manager state can be analyzed after the fact. |
| 41 | */ |
| 42 | class WindowTracing { |
| 43 | |
Nataniel Borges | 5a38bad | 2019-01-03 10:32:03 -0800 | [diff] [blame] | 44 | /** |
| 45 | * Maximum buffer size, currently defined as 512 KB |
| 46 | * Size was experimentally defined to fit between 100 to 150 elements. |
| 47 | */ |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 48 | private static final int BUFFER_CAPACITY_CRITICAL = 512 * 1024; |
| 49 | private static final int BUFFER_CAPACITY_TRIM = 2048 * 1024; |
| 50 | private static final int BUFFER_CAPACITY_ALL = 4096 * 1024; |
| 51 | private static final String TRACE_FILENAME = "/data/misc/wmtrace/wm_trace.pb"; |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 52 | private static final String TAG = "WindowTracing"; |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 53 | |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 54 | private final WindowManagerService mService; |
| 55 | private final Choreographer mChoreographer; |
| 56 | private final WindowManagerGlobalLock mGlobalLock; |
| 57 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 58 | private final Object mEnabledLock = new Object(); |
| 59 | private final File mTraceFile; |
| 60 | private final WindowTraceBuffer mBuffer; |
| 61 | private final Choreographer.FrameCallback mFrameCallback = (frameTimeNanos) -> |
| 62 | log("onFrame" /* where */); |
Nataniel Borges | 5a38bad | 2019-01-03 10:32:03 -0800 | [diff] [blame] | 63 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 64 | private @WindowTraceLogLevel int mLogLevel = WindowTraceLogLevel.TRIM; |
| 65 | private boolean mLogOnFrame = false; |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 66 | private boolean mEnabled; |
| 67 | private volatile boolean mEnabledLockFree; |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 68 | private boolean mScheduled; |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 69 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 70 | static WindowTracing createDefaultAndStartLooper(WindowManagerService service, |
| 71 | Choreographer choreographer) { |
| 72 | File file = new File(TRACE_FILENAME); |
| 73 | return new WindowTracing(file, service, choreographer, BUFFER_CAPACITY_TRIM); |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 74 | } |
| 75 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 76 | private WindowTracing(File file, WindowManagerService service, Choreographer choreographer, |
| 77 | int bufferCapacity) { |
| 78 | this(file, service, choreographer, service.mGlobalLock, bufferCapacity); |
| 79 | } |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 80 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 81 | WindowTracing(File file, WindowManagerService service, Choreographer choreographer, |
| 82 | WindowManagerGlobalLock globalLock, int bufferCapacity) { |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 83 | mChoreographer = choreographer; |
| 84 | mService = service; |
| 85 | mGlobalLock = globalLock; |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 86 | mTraceFile = file; |
| 87 | mBuffer = new WindowTraceBuffer(bufferCapacity); |
| 88 | setLogLevel(WindowTraceLogLevel.TRIM, null /* pw */); |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 89 | } |
| 90 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 91 | void startTrace(@Nullable PrintWriter pw) { |
Nataniel Borges | 5a38bad | 2019-01-03 10:32:03 -0800 | [diff] [blame] | 92 | if (IS_USER) { |
Vishnu Nair | ab25003 | 2017-11-21 07:32:43 -0800 | [diff] [blame] | 93 | logAndPrintln(pw, "Error: Tracing is not supported on user builds."); |
| 94 | return; |
| 95 | } |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 96 | synchronized (mEnabledLock) { |
| 97 | logAndPrintln(pw, "Start tracing to " + mTraceFile + "."); |
| 98 | mBuffer.resetBuffer(); |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 99 | mEnabled = mEnabledLockFree = true; |
| 100 | } |
Nataniel Borges | 8a5106c | 2019-03-06 11:31:34 -0800 | [diff] [blame] | 101 | log("trace.enable"); |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 102 | } |
| 103 | |
Nataniel Borges | 9e26046 | 2019-02-27 17:02:20 -0800 | [diff] [blame] | 104 | /** |
| 105 | * Stops the trace and write the current buffer to disk |
| 106 | * @param pw Print writer |
| 107 | */ |
Vishnu Nair | c961504 | 2018-01-09 07:23:31 -0800 | [diff] [blame] | 108 | void stopTrace(@Nullable PrintWriter pw) { |
Nataniel Borges | 9e26046 | 2019-02-27 17:02:20 -0800 | [diff] [blame] | 109 | stopTrace(pw, true /* writeToFile */); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Stops the trace |
| 114 | * @param pw Print writer |
| 115 | * @param writeToFile If the current buffer should be written to disk or not |
| 116 | */ |
| 117 | void stopTrace(@Nullable PrintWriter pw, boolean writeToFile) { |
Nataniel Borges | 5a38bad | 2019-01-03 10:32:03 -0800 | [diff] [blame] | 118 | if (IS_USER) { |
Vishnu Nair | ab25003 | 2017-11-21 07:32:43 -0800 | [diff] [blame] | 119 | logAndPrintln(pw, "Error: Tracing is not supported on user builds."); |
| 120 | return; |
| 121 | } |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 122 | synchronized (mEnabledLock) { |
| 123 | logAndPrintln(pw, "Stop tracing to " + mTraceFile + ". Waiting for traces to flush."); |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 124 | mEnabled = mEnabledLockFree = false; |
Nataniel Borges | 5a38bad | 2019-01-03 10:32:03 -0800 | [diff] [blame] | 125 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 126 | if (mEnabled) { |
| 127 | logAndPrintln(pw, "ERROR: tracing was re-enabled while waiting for flush."); |
| 128 | throw new IllegalStateException("tracing enabled while waiting for flush."); |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 129 | } |
Nataniel Borges | 9e26046 | 2019-02-27 17:02:20 -0800 | [diff] [blame] | 130 | if (writeToFile) { |
| 131 | writeTraceToFileLocked(); |
| 132 | logAndPrintln(pw, "Trace written to " + mTraceFile + "."); |
| 133 | } |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 134 | } |
| 135 | } |
| 136 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 137 | private void setLogLevel(@WindowTraceLogLevel int logLevel, PrintWriter pw) { |
| 138 | logAndPrintln(pw, "Setting window tracing log level to " + logLevel); |
| 139 | mLogLevel = logLevel; |
Nataniel Borges | 98d92aa | 2019-01-03 14:22:44 -0800 | [diff] [blame] | 140 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 141 | switch (logLevel) { |
| 142 | case WindowTraceLogLevel.ALL: { |
| 143 | setBufferCapacity(BUFFER_CAPACITY_ALL, pw); |
| 144 | break; |
| 145 | } |
| 146 | case WindowTraceLogLevel.TRIM: { |
| 147 | setBufferCapacity(BUFFER_CAPACITY_TRIM, pw); |
| 148 | break; |
| 149 | } |
| 150 | case WindowTraceLogLevel.CRITICAL: { |
| 151 | setBufferCapacity(BUFFER_CAPACITY_CRITICAL, pw); |
| 152 | break; |
| 153 | } |
Nataniel Borges | 98d92aa | 2019-01-03 14:22:44 -0800 | [diff] [blame] | 154 | } |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | private void setLogFrequency(boolean onFrame, PrintWriter pw) { |
| 158 | logAndPrintln(pw, "Setting window tracing log frequency to " |
| 159 | + ((onFrame) ? "frame" : "transaction")); |
| 160 | mLogOnFrame = onFrame; |
| 161 | } |
| 162 | |
| 163 | private void setBufferCapacity(int capacity, PrintWriter pw) { |
| 164 | logAndPrintln(pw, "Setting window tracing buffer capacity to " + capacity + "bytes"); |
| 165 | mBuffer.setCapacity(capacity); |
Nataniel Borges | 98d92aa | 2019-01-03 14:22:44 -0800 | [diff] [blame] | 166 | } |
| 167 | |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 168 | boolean isEnabled() { |
| 169 | return mEnabledLockFree; |
| 170 | } |
| 171 | |
Nataniel Borges | 98d92aa | 2019-01-03 14:22:44 -0800 | [diff] [blame] | 172 | int onShellCommand(ShellCommand shell) { |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 173 | PrintWriter pw = shell.getOutPrintWriter(); |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 174 | String cmd = shell.getNextArgRequired(); |
| 175 | switch (cmd) { |
| 176 | case "start": |
| 177 | startTrace(pw); |
| 178 | return 0; |
| 179 | case "stop": |
| 180 | stopTrace(pw); |
| 181 | return 0; |
| 182 | case "status": |
| 183 | logAndPrintln(pw, getStatus()); |
| 184 | return 0; |
| 185 | case "frame": |
| 186 | setLogFrequency(true /* onFrame */, pw); |
| 187 | mBuffer.resetBuffer(); |
| 188 | return 0; |
| 189 | case "transaction": |
| 190 | setLogFrequency(false /* onFrame */, pw); |
| 191 | mBuffer.resetBuffer(); |
| 192 | return 0; |
| 193 | case "level": |
| 194 | String logLevelStr = shell.getNextArgRequired().toLowerCase(); |
| 195 | switch (logLevelStr) { |
| 196 | case "all": { |
| 197 | setLogLevel(WindowTraceLogLevel.ALL, pw); |
| 198 | break; |
| 199 | } |
| 200 | case "trim": { |
| 201 | setLogLevel(WindowTraceLogLevel.TRIM, pw); |
| 202 | break; |
| 203 | } |
| 204 | case "critical": { |
| 205 | setLogLevel(WindowTraceLogLevel.CRITICAL, pw); |
| 206 | break; |
| 207 | } |
| 208 | default: { |
| 209 | setLogLevel(WindowTraceLogLevel.TRIM, pw); |
| 210 | break; |
| 211 | } |
| 212 | } |
| 213 | mBuffer.resetBuffer(); |
| 214 | return 0; |
| 215 | case "size": |
| 216 | setBufferCapacity(Integer.parseInt(shell.getNextArgRequired()) * 1024, pw); |
| 217 | mBuffer.resetBuffer(); |
| 218 | return 0; |
| 219 | default: |
| 220 | pw.println("Unknown command: " + cmd); |
| 221 | pw.println("Window manager trace options:"); |
| 222 | pw.println(" start: Start logging"); |
| 223 | pw.println(" stop: Stop logging"); |
| 224 | pw.println(" frame: Log trace once per frame"); |
| 225 | pw.println(" transaction: Log each transaction"); |
| 226 | pw.println(" size: Set the maximum log size (in KB)"); |
Nataniel Borges | c0e18bf | 2019-02-25 10:45:27 -0800 | [diff] [blame] | 227 | pw.println(" status: Print trace status"); |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 228 | pw.println(" level [lvl]: Set the log level between"); |
| 229 | pw.println(" lvl may be one of:"); |
| 230 | pw.println(" critical: Only visible windows with reduced information"); |
| 231 | pw.println(" trim: All windows with reduced"); |
| 232 | pw.println(" all: All window and information"); |
| 233 | return -1; |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 234 | } |
| 235 | } |
| 236 | |
Nataniel Borges | 24325ce | 2019-02-05 15:43:29 -0800 | [diff] [blame] | 237 | String getStatus() { |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 238 | return "Status: " |
| 239 | + ((isEnabled()) ? "Enabled" : "Disabled") |
| 240 | + "\n" |
| 241 | + "Log level: " |
| 242 | + mLogLevel |
| 243 | + "\n" |
| 244 | + mBuffer.getStatus(); |
| 245 | } |
| 246 | |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 247 | /** |
| 248 | * If tracing is enabled, log the current state or schedule the next frame to be logged, |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 249 | * according to {@link #mLogOnFrame}. |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 250 | * |
| 251 | * @param where Logging point descriptor |
| 252 | */ |
| 253 | void logState(String where) { |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 254 | if (!isEnabled()) { |
| 255 | return; |
| 256 | } |
Nataniel Borges | 98d92aa | 2019-01-03 14:22:44 -0800 | [diff] [blame] | 257 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 258 | if (mLogOnFrame) { |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 259 | schedule(); |
| 260 | } else { |
| 261 | log(where); |
| 262 | } |
| 263 | } |
Nataniel Borges | 023ecb5 | 2019-01-16 14:15:43 -0800 | [diff] [blame] | 264 | |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 265 | /** |
| 266 | * Schedule the log to trace the next frame |
| 267 | */ |
| 268 | private void schedule() { |
| 269 | if (mScheduled) { |
| 270 | return; |
| 271 | } |
| 272 | |
| 273 | mScheduled = true; |
| 274 | mChoreographer.postFrameCallback(mFrameCallback); |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Write the current frame to the buffer |
| 279 | * |
| 280 | * @param where Logging point descriptor |
| 281 | */ |
| 282 | private void log(String where) { |
| 283 | Trace.traceBegin(Trace.TRACE_TAG_WINDOW_MANAGER, "traceStateLocked"); |
| 284 | try { |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 285 | ProtoOutputStream os = new ProtoOutputStream(); |
| 286 | long tokenOuter = os.start(ENTRY); |
| 287 | os.write(ELAPSED_REALTIME_NANOS, SystemClock.elapsedRealtimeNanos()); |
| 288 | os.write(WHERE, where); |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 289 | |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 290 | long tokenInner = os.start(WINDOW_MANAGER_SERVICE); |
| 291 | synchronized (mGlobalLock) { |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 292 | Trace.traceBegin(Trace.TRACE_TAG_WINDOW_MANAGER, "writeToProtoLocked"); |
| 293 | try { |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 294 | mService.writeToProtoLocked(os, mLogLevel); |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 295 | } finally { |
| 296 | Trace.traceEnd(Trace.TRACE_TAG_WINDOW_MANAGER); |
| 297 | } |
Nataniel Borges | 023ecb5 | 2019-01-16 14:15:43 -0800 | [diff] [blame] | 298 | } |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 299 | os.end(tokenInner); |
| 300 | os.end(tokenOuter); |
| 301 | mBuffer.add(os); |
| 302 | mScheduled = false; |
Nataniel Borges | 48d9aa9 | 2019-02-01 14:45:55 -0800 | [diff] [blame] | 303 | } catch (Exception e) { |
| 304 | Log.wtf(TAG, "Exception while tracing state", e); |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 305 | } finally { |
| 306 | Trace.traceEnd(Trace.TRACE_TAG_WINDOW_MANAGER); |
| 307 | } |
Adrian Roos | 111aff9 | 2017-09-27 18:11:46 +0200 | [diff] [blame] | 308 | } |
Nataniel Borges | 98d92aa | 2019-01-03 14:22:44 -0800 | [diff] [blame] | 309 | |
| 310 | /** |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 311 | * Writes the trace buffer to new file for the bugreport. |
| 312 | * |
Nataniel Borges | 98d92aa | 2019-01-03 14:22:44 -0800 | [diff] [blame] | 313 | * This method is synchronized with {@code #startTrace(PrintWriter)} and |
| 314 | * {@link #stopTrace(PrintWriter)}. |
| 315 | */ |
| 316 | void writeTraceToFile() { |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 317 | synchronized (mEnabledLock) { |
Nataniel Borges | 98d92aa | 2019-01-03 14:22:44 -0800 | [diff] [blame] | 318 | writeTraceToFileLocked(); |
| 319 | } |
| 320 | } |
Nataniel Borges | 7d37ce2 | 2019-02-05 10:07:02 -0800 | [diff] [blame] | 321 | |
| 322 | private void logAndPrintln(@Nullable PrintWriter pw, String msg) { |
| 323 | Log.i(TAG, msg); |
| 324 | if (pw != null) { |
| 325 | pw.println(msg); |
| 326 | pw.flush(); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * Writes the trace buffer to disk. This method has no internal synchronization and should be |
| 332 | * externally synchronized |
| 333 | */ |
| 334 | private void writeTraceToFileLocked() { |
| 335 | try { |
| 336 | Trace.traceBegin(Trace.TRACE_TAG_WINDOW_MANAGER, "writeTraceToFileLocked"); |
| 337 | mBuffer.writeTraceToFile(mTraceFile); |
| 338 | } catch (IOException e) { |
| 339 | Log.e(TAG, "Unable to write buffer to file", e); |
| 340 | } finally { |
| 341 | Trace.traceEnd(Trace.TRACE_TAG_WINDOW_MANAGER); |
| 342 | } |
| 343 | } |
| 344 | } |