John Reck | edc524c | 2015-03-18 15:24:33 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.content.pm.PackageInfo; |
| 21 | import android.content.pm.PackageManager.NameNotFoundException; |
| 22 | import android.os.Binder; |
| 23 | import android.os.IBinder; |
| 24 | import android.os.MemoryFile; |
| 25 | import android.os.ParcelFileDescriptor; |
| 26 | import android.os.RemoteException; |
| 27 | import android.util.Log; |
| 28 | import android.view.IGraphicsStats; |
| 29 | import android.view.ThreadedRenderer; |
| 30 | |
| 31 | import java.io.FileDescriptor; |
| 32 | import java.io.IOException; |
| 33 | import java.io.PrintWriter; |
| 34 | import java.util.ArrayList; |
| 35 | |
| 36 | /** |
| 37 | * This service's job is to collect aggregate rendering profile data. It |
| 38 | * does this by allowing rendering processes to request an ashmem buffer |
| 39 | * to place their stats into. This buffer will be pre-initialized with historical |
| 40 | * data for that process if it exists (if the userId & packageName match a buffer |
| 41 | * in the historical log) |
| 42 | * |
| 43 | * This service does not itself attempt to understand the data in the buffer, |
| 44 | * its primary job is merely to manage distributing these buffers. However, |
| 45 | * it is assumed that this buffer is for ThreadedRenderer and delegates |
| 46 | * directly to ThreadedRenderer for dumping buffers. |
| 47 | * |
| 48 | * MEMORY USAGE: |
| 49 | * |
| 50 | * This class consumes UP TO: |
| 51 | * 1) [active rendering processes] * (ASHMEM_SIZE * 2) |
| 52 | * 2) ASHMEM_SIZE (for scratch space used during dumping) |
| 53 | * 3) ASHMEM_SIZE * HISTORY_SIZE |
| 54 | * |
John Reck | 5742b97 | 2015-05-11 14:29:55 -0700 | [diff] [blame] | 55 | * Currently ASHMEM_SIZE is 256 bytes and HISTORY_SIZE is 20. Assuming |
John Reck | edc524c | 2015-03-18 15:24:33 -0700 | [diff] [blame] | 56 | * the system then also has 10 active rendering processes in the worst case |
John Reck | 5742b97 | 2015-05-11 14:29:55 -0700 | [diff] [blame] | 57 | * this would end up using under 14KiB (12KiB for the buffers, plus some overhead |
John Reck | edc524c | 2015-03-18 15:24:33 -0700 | [diff] [blame] | 58 | * for userId, pid, package name, and a couple other objects) |
| 59 | * |
| 60 | * @hide */ |
| 61 | public class GraphicsStatsService extends IGraphicsStats.Stub { |
| 62 | public static final String GRAPHICS_STATS_SERVICE = "graphicsstats"; |
| 63 | |
| 64 | private static final String TAG = "GraphicsStatsService"; |
| 65 | private static final int ASHMEM_SIZE = 256; |
John Reck | 5742b97 | 2015-05-11 14:29:55 -0700 | [diff] [blame] | 66 | private static final int HISTORY_SIZE = 20; |
John Reck | edc524c | 2015-03-18 15:24:33 -0700 | [diff] [blame] | 67 | |
| 68 | private final Context mContext; |
| 69 | private final Object mLock = new Object(); |
| 70 | private ArrayList<ActiveBuffer> mActive = new ArrayList<>(); |
| 71 | private HistoricalData[] mHistoricalLog = new HistoricalData[HISTORY_SIZE]; |
| 72 | private int mNextHistoricalSlot = 0; |
| 73 | private byte[] mTempBuffer = new byte[ASHMEM_SIZE]; |
| 74 | |
| 75 | public GraphicsStatsService(Context context) { |
| 76 | mContext = context; |
| 77 | } |
| 78 | |
| 79 | private boolean isValid(int uid, String packageName) { |
| 80 | try { |
| 81 | PackageInfo info = mContext.getPackageManager().getPackageInfo(packageName, 0); |
| 82 | return info.applicationInfo.uid == uid; |
| 83 | } catch (NameNotFoundException e) { |
| 84 | } |
| 85 | return false; |
| 86 | } |
| 87 | |
| 88 | @Override |
| 89 | public ParcelFileDescriptor requestBufferForProcess(String packageName, IBinder token) |
| 90 | throws RemoteException { |
| 91 | int uid = Binder.getCallingUid(); |
| 92 | int pid = Binder.getCallingPid(); |
| 93 | ParcelFileDescriptor pfd = null; |
| 94 | long callingIdentity = Binder.clearCallingIdentity(); |
| 95 | try { |
| 96 | if (!isValid(uid, packageName)) { |
| 97 | throw new RemoteException("Invalid package name"); |
| 98 | } |
| 99 | synchronized (mLock) { |
| 100 | pfd = requestBufferForProcessLocked(token, uid, pid, packageName); |
| 101 | } |
| 102 | } finally { |
| 103 | Binder.restoreCallingIdentity(callingIdentity); |
| 104 | } |
| 105 | return pfd; |
| 106 | } |
| 107 | |
| 108 | private ParcelFileDescriptor getPfd(MemoryFile file) { |
| 109 | try { |
| 110 | return new ParcelFileDescriptor(file.getFileDescriptor()); |
| 111 | } catch (IOException ex) { |
| 112 | throw new IllegalStateException("Failed to get PFD from memory file", ex); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | private ParcelFileDescriptor requestBufferForProcessLocked(IBinder token, |
| 117 | int uid, int pid, String packageName) throws RemoteException { |
| 118 | ActiveBuffer buffer = fetchActiveBuffersLocked(token, uid, pid, packageName); |
| 119 | return getPfd(buffer.mProcessBuffer); |
| 120 | } |
| 121 | |
| 122 | private void processDied(ActiveBuffer buffer) { |
| 123 | synchronized (mLock) { |
| 124 | mActive.remove(buffer); |
| 125 | Log.d("GraphicsStats", "Buffer count: " + mActive.size()); |
| 126 | } |
| 127 | HistoricalData data = buffer.mPreviousData; |
| 128 | buffer.mPreviousData = null; |
| 129 | if (data == null) { |
| 130 | data = mHistoricalLog[mNextHistoricalSlot]; |
| 131 | if (data == null) { |
| 132 | data = new HistoricalData(); |
| 133 | } |
| 134 | } |
| 135 | data.update(buffer.mPackageName, buffer.mUid, buffer.mProcessBuffer); |
| 136 | buffer.closeAllBuffers(); |
| 137 | |
| 138 | mHistoricalLog[mNextHistoricalSlot] = data; |
| 139 | mNextHistoricalSlot = (mNextHistoricalSlot + 1) % mHistoricalLog.length; |
| 140 | } |
| 141 | |
| 142 | private ActiveBuffer fetchActiveBuffersLocked(IBinder token, int uid, int pid, |
| 143 | String packageName) throws RemoteException { |
| 144 | int size = mActive.size(); |
| 145 | for (int i = 0; i < size; i++) { |
| 146 | ActiveBuffer buffers = mActive.get(i); |
| 147 | if (buffers.mPid == pid |
| 148 | && buffers.mUid == uid) { |
| 149 | return buffers; |
| 150 | } |
| 151 | } |
| 152 | // Didn't find one, need to create it |
| 153 | try { |
| 154 | ActiveBuffer buffers = new ActiveBuffer(token, uid, pid, packageName); |
| 155 | mActive.add(buffers); |
| 156 | return buffers; |
| 157 | } catch (IOException ex) { |
| 158 | throw new RemoteException("Failed to allocate space"); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | private HistoricalData removeHistoricalDataLocked(int uid, String packageName) { |
| 163 | for (int i = 0; i < mHistoricalLog.length; i++) { |
| 164 | final HistoricalData data = mHistoricalLog[i]; |
| 165 | if (data != null && data.mUid == uid |
| 166 | && data.mPackageName.equals(packageName)) { |
| 167 | if (i == mNextHistoricalSlot) { |
| 168 | mHistoricalLog[i] = null; |
| 169 | } else { |
| 170 | mHistoricalLog[i] = mHistoricalLog[mNextHistoricalSlot]; |
| 171 | mHistoricalLog[mNextHistoricalSlot] = null; |
| 172 | } |
| 173 | return data; |
| 174 | } |
| 175 | } |
| 176 | return null; |
| 177 | } |
| 178 | |
| 179 | @Override |
| 180 | protected void dump(FileDescriptor fd, PrintWriter fout, String[] args) { |
| 181 | mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DUMP, TAG); |
| 182 | synchronized (mLock) { |
| 183 | for (int i = 0; i < mActive.size(); i++) { |
| 184 | final ActiveBuffer buffer = mActive.get(i); |
| 185 | fout.print("Package: "); |
| 186 | fout.print(buffer.mPackageName); |
| 187 | fout.flush(); |
| 188 | try { |
| 189 | buffer.mProcessBuffer.readBytes(mTempBuffer, 0, 0, ASHMEM_SIZE); |
| 190 | ThreadedRenderer.dumpProfileData(mTempBuffer, fd); |
| 191 | } catch (IOException e) { |
| 192 | fout.println("Failed to dump"); |
| 193 | } |
| 194 | fout.println(); |
| 195 | } |
| 196 | for (HistoricalData buffer : mHistoricalLog) { |
| 197 | if (buffer == null) continue; |
| 198 | fout.print("Package: "); |
| 199 | fout.print(buffer.mPackageName); |
| 200 | fout.flush(); |
| 201 | ThreadedRenderer.dumpProfileData(buffer.mBuffer, fd); |
| 202 | fout.println(); |
| 203 | } |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | private final class ActiveBuffer implements DeathRecipient { |
| 208 | final int mUid; |
| 209 | final int mPid; |
| 210 | final String mPackageName; |
| 211 | final IBinder mToken; |
| 212 | MemoryFile mProcessBuffer; |
| 213 | HistoricalData mPreviousData; |
| 214 | |
| 215 | ActiveBuffer(IBinder token, int uid, int pid, String packageName) |
| 216 | throws RemoteException, IOException { |
| 217 | mUid = uid; |
| 218 | mPid = pid; |
| 219 | mPackageName = packageName; |
| 220 | mToken = token; |
| 221 | mToken.linkToDeath(this, 0); |
| 222 | mProcessBuffer = new MemoryFile("GFXStats-" + uid, ASHMEM_SIZE); |
| 223 | mPreviousData = removeHistoricalDataLocked(mUid, mPackageName); |
| 224 | if (mPreviousData != null) { |
| 225 | mProcessBuffer.writeBytes(mPreviousData.mBuffer, 0, 0, ASHMEM_SIZE); |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | @Override |
| 230 | public void binderDied() { |
| 231 | mToken.unlinkToDeath(this, 0); |
| 232 | processDied(this); |
| 233 | } |
| 234 | |
| 235 | void closeAllBuffers() { |
| 236 | if (mProcessBuffer != null) { |
| 237 | mProcessBuffer.close(); |
| 238 | mProcessBuffer = null; |
| 239 | } |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | private final static class HistoricalData { |
| 244 | final byte[] mBuffer = new byte[ASHMEM_SIZE]; |
| 245 | int mUid; |
| 246 | String mPackageName; |
| 247 | |
| 248 | void update(String packageName, int uid, MemoryFile file) { |
| 249 | mUid = uid; |
| 250 | mPackageName = packageName; |
| 251 | try { |
| 252 | file.readBytes(mBuffer, 0, 0, ASHMEM_SIZE); |
| 253 | } catch (IOException e) {} |
| 254 | } |
| 255 | } |
| 256 | } |