/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.app.AlarmManager;
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import android.app.AppOpsManager;
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import android.content.Context;
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import android.content.pm.PackageInfo;
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import android.content.pm.PackageManager;
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import android.os.Binder;
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import android.os.Environment;
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import android.os.Handler;
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import android.os.HandlerThread;
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import android.os.IBinder;
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import android.os.MemoryFile;
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import android.os.Message;
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import android.os.ParcelFileDescriptor;
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import android.os.Process;
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import android.os.RemoteException;
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import android.os.Trace;
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import android.os.UserHandle;
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import android.util.Log;
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import android.view.IGraphicsStats;
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import android.view.IGraphicsStatsCallback;
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import com.android.internal.util.DumpUtils;
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import java.io.File;
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import java.io.FileDescriptor;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Calendar;
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import java.util.HashSet;
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import java.util.TimeZone;
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/**
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* This service's job is to collect aggregate rendering profile data. It
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* does this by allowing rendering processes to request an ashmem buffer
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* to place their stats into.
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*
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* Buffers are rotated on a daily (in UTC) basis and only the 3 most-recent days
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* are kept.
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*
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* The primary consumer of this is incident reports and automated metric checking. It is not
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* intended for end-developer consumption, for that we have gfxinfo.
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*
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* Buffer rotation process:
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* 1) Alarm fires
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* 2) onRotateGraphicsStatsBuffer() is sent to all active processes
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* 3) Upon receiving the callback, the process will stop using the previous ashmem buffer and
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* request a new one.
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* 4) When that request is received we now know that the ashmem region is no longer in use so
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* it gets queued up for saving to disk and a new ashmem region is created and returned
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* for the process to use.
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*
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* @hide */
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public class GraphicsStatsService extends IGraphicsStats.Stub {
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public static final String GRAPHICS_STATS_SERVICE = "graphicsstats";
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private static final String TAG = "GraphicsStatsService";
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private static final int SAVE_BUFFER = 1;
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private static final int DELETE_OLD = 2;
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// This isn't static because we need this to happen after registerNativeMethods, however
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// the class is loaded (and thus static ctor happens) before that occurs.
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private final int ASHMEM_SIZE = nGetAshmemSize();
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private final byte[] ZERO_DATA = new byte[ASHMEM_SIZE];
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private final Context mContext;
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private final AppOpsManager mAppOps;
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private final AlarmManager mAlarmManager;
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private final Object mLock = new Object();
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private ArrayList<ActiveBuffer> mActive = new ArrayList<>();
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private File mGraphicsStatsDir;
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private final Object mFileAccessLock = new Object();
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private Handler mWriteOutHandler;
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private boolean mRotateIsScheduled = false;
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public GraphicsStatsService(Context context) {
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mContext = context;
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mAppOps = context.getSystemService(AppOpsManager.class);
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mAlarmManager = context.getSystemService(AlarmManager.class);
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File systemDataDir = new File(Environment.getDataDirectory(), "system");
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mGraphicsStatsDir = new File(systemDataDir, "graphicsstats");
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mGraphicsStatsDir.mkdirs();
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if (!mGraphicsStatsDir.exists()) {
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throw new IllegalStateException("Graphics stats directory does not exist: "
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+ mGraphicsStatsDir.getAbsolutePath());
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}
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HandlerThread bgthread = new HandlerThread("GraphicsStats-disk", Process.THREAD_PRIORITY_BACKGROUND);
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bgthread.start();
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mWriteOutHandler = new Handler(bgthread.getLooper(), new Handler.Callback() {
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@Override
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public boolean handleMessage(Message msg) {
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switch (msg.what) {
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case SAVE_BUFFER:
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saveBuffer((HistoricalBuffer) msg.obj);
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break;
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case DELETE_OLD:
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deleteOldBuffers();
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break;
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}
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return true;
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}
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});
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}
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/**
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* Current rotation policy is to rotate at midnight UTC. We don't specify RTC_WAKEUP because
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* rotation can be delayed if there's otherwise no activity. However exact is used because
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* we don't want the system to delay it by TOO much.
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*/
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private void scheduleRotateLocked() {
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if (mRotateIsScheduled) {
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return;
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}
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mRotateIsScheduled = true;
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Calendar calendar = normalizeDate(System.currentTimeMillis());
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calendar.add(Calendar.DATE, 1);
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mAlarmManager.setExact(AlarmManager.RTC, calendar.getTimeInMillis(), TAG, this::onAlarm,
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mWriteOutHandler);
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}
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private void onAlarm() {
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// We need to make a copy since some of the callbacks won't be proxy and thus
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// can result in a re-entrant acquisition of mLock that would result in a modification
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// of mActive during iteration.
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ActiveBuffer[] activeCopy;
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synchronized (mLock) {
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mRotateIsScheduled = false;
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scheduleRotateLocked();
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activeCopy = mActive.toArray(new ActiveBuffer[0]);
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}
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for (ActiveBuffer active : activeCopy) {
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try {
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active.mCallback.onRotateGraphicsStatsBuffer();
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} catch (RemoteException e) {
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Log.w(TAG, String.format("Failed to notify '%s' (pid=%d) to rotate buffers",
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active.mInfo.packageName, active.mPid), e);
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}
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}
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// Give a few seconds for everyone to rotate before doing the cleanup
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mWriteOutHandler.sendEmptyMessageDelayed(DELETE_OLD, 10000);
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}
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@Override
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public ParcelFileDescriptor requestBufferForProcess(String packageName, IGraphicsStatsCallback token)
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throws RemoteException {
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int uid = Binder.getCallingUid();
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int pid = Binder.getCallingPid();
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ParcelFileDescriptor pfd = null;
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long callingIdentity = Binder.clearCallingIdentity();
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try {
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mAppOps.checkPackage(uid, packageName);
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PackageInfo info = mContext.getPackageManager().getPackageInfoAsUser(
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packageName,
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0,
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UserHandle.getUserId(uid));
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synchronized (mLock) {
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pfd = requestBufferForProcessLocked(token, uid, pid, packageName,
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info.getLongVersionCode());
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}
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} catch (PackageManager.NameNotFoundException ex) {
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throw new RemoteException("Unable to find package: '" + packageName + "'");
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} finally {
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Binder.restoreCallingIdentity(callingIdentity);
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}
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return pfd;
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}
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private ParcelFileDescriptor getPfd(MemoryFile file) {
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try {
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if (!file.getFileDescriptor().valid()) {
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throw new IllegalStateException("Invalid file descriptor");
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}
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return new ParcelFileDescriptor(file.getFileDescriptor());
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} catch (IOException ex) {
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throw new IllegalStateException("Failed to get PFD from memory file", ex);
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}
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}
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private ParcelFileDescriptor requestBufferForProcessLocked(IGraphicsStatsCallback token,
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int uid, int pid, String packageName, long versionCode) throws RemoteException {
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ActiveBuffer buffer = fetchActiveBuffersLocked(token, uid, pid, packageName, versionCode);
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scheduleRotateLocked();
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return getPfd(buffer.mProcessBuffer);
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}
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private Calendar normalizeDate(long timestamp) {
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Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
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calendar.setTimeInMillis(timestamp);
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calendar.set(Calendar.HOUR_OF_DAY, 0);
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calendar.set(Calendar.MINUTE, 0);
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calendar.set(Calendar.SECOND, 0);
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calendar.set(Calendar.MILLISECOND, 0);
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return calendar;
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}
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private File pathForApp(BufferInfo info) {
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String subPath = String.format("%d/%s/%d/total",
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normalizeDate(info.startTime).getTimeInMillis(), info.packageName, info.versionCode);
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return new File(mGraphicsStatsDir, subPath);
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}
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private void saveBuffer(HistoricalBuffer buffer) {
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if (Trace.isTagEnabled(Trace.TRACE_TAG_SYSTEM_SERVER)) {
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Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "saving graphicsstats for " + buffer.mInfo.packageName);
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}
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synchronized (mFileAccessLock) {
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File path = pathForApp(buffer.mInfo);
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File parent = path.getParentFile();
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parent.mkdirs();
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if (!parent.exists()) {
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Log.w(TAG, "Unable to create path: '" + parent.getAbsolutePath() + "'");
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return;
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}
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nSaveBuffer(path.getAbsolutePath(), buffer.mInfo.packageName, buffer.mInfo.versionCode,
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buffer.mInfo.startTime, buffer.mInfo.endTime, buffer.mData);
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}
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Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
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}
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private void deleteRecursiveLocked(File file) {
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if (file.isDirectory()) {
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for (File child : file.listFiles()) {
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deleteRecursiveLocked(child);
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}
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}
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if (!file.delete()) {
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Log.w(TAG, "Failed to delete '" + file.getAbsolutePath() + "'!");
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}
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}
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private void deleteOldBuffers() {
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Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "deleting old graphicsstats buffers");
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synchronized (mFileAccessLock) {
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File[] files = mGraphicsStatsDir.listFiles();
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if (files == null || files.length <= 3) {
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return;
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}
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long[] sortedDates = new long[files.length];
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for (int i = 0; i < files.length; i++) {
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try {
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sortedDates[i] = Long.parseLong(files[i].getName());
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} catch (NumberFormatException ex) {
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// Skip unrecognized folders
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}
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}
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if (sortedDates.length <= 3) {
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return;
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}
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Arrays.sort(sortedDates);
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for (int i = 0; i < sortedDates.length - 3; i++) {
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deleteRecursiveLocked(new File(mGraphicsStatsDir, Long.toString(sortedDates[i])));
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}
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}
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Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
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}
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private void addToSaveQueue(ActiveBuffer buffer) {
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try {
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HistoricalBuffer data = new HistoricalBuffer(buffer);
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Message.obtain(mWriteOutHandler, SAVE_BUFFER, data).sendToTarget();
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} catch (IOException e) {
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Log.w(TAG, "Failed to copy graphicsstats from " + buffer.mInfo.packageName, e);
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}
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buffer.closeAllBuffers();
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}
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private void processDied(ActiveBuffer buffer) {
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synchronized (mLock) {
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mActive.remove(buffer);
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}
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addToSaveQueue(buffer);
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}
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private ActiveBuffer fetchActiveBuffersLocked(IGraphicsStatsCallback token, int uid, int pid,
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String packageName, long versionCode) throws RemoteException {
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int size = mActive.size();
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long today = normalizeDate(System.currentTimeMillis()).getTimeInMillis();
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for (int i = 0; i < size; i++) {
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ActiveBuffer buffer = mActive.get(i);
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if (buffer.mPid == pid
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&& buffer.mUid == uid) {
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// If the buffer is too old we remove it and return a new one
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if (buffer.mInfo.startTime < today) {
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buffer.binderDied();
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break;
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} else {
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return buffer;
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}
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}
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}
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// Didn't find one, need to create it
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try {
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ActiveBuffer buffers = new ActiveBuffer(token, uid, pid, packageName, versionCode);
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mActive.add(buffers);
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return buffers;
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} catch (IOException ex) {
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throw new RemoteException("Failed to allocate space");
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}
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}
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private HashSet<File> dumpActiveLocked(long dump, ArrayList<HistoricalBuffer> buffers) {
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HashSet<File> skipFiles = new HashSet<>(buffers.size());
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for (int i = 0; i < buffers.size(); i++) {
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HistoricalBuffer buffer = buffers.get(i);
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File path = pathForApp(buffer.mInfo);
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skipFiles.add(path);
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nAddToDump(dump, path.getAbsolutePath(), buffer.mInfo.packageName,
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buffer.mInfo.versionCode, buffer.mInfo.startTime, buffer.mInfo.endTime,
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buffer.mData);
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}
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return skipFiles;
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}
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private void dumpHistoricalLocked(long dump, HashSet<File> skipFiles) {
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for (File date : mGraphicsStatsDir.listFiles()) {
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for (File pkg : date.listFiles()) {
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for (File version : pkg.listFiles()) {
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File data = new File(version, "total");
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if (skipFiles.contains(data)) {
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continue;
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}
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nAddToDump(dump, data.getAbsolutePath());
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}
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}
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}
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}
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@Override
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protected void dump(FileDescriptor fd, PrintWriter fout, String[] args) {
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if (!DumpUtils.checkDumpAndUsageStatsPermission(mContext, TAG, fout)) return;
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boolean dumpProto = false;
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for (String str : args) {
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if ("--proto".equals(str)) {
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dumpProto = true;
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break;
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}
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}
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ArrayList<HistoricalBuffer> buffers;
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synchronized (mLock) {
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buffers = new ArrayList<>(mActive.size());
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for (int i = 0; i < mActive.size(); i++) {
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try {
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buffers.add(new HistoricalBuffer(mActive.get(i)));
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} catch (IOException ex) {
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// Ignore
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}
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}
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}
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long dump = nCreateDump(fd.getInt$(), dumpProto);
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try {
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synchronized (mFileAccessLock) {
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HashSet<File> skipList = dumpActiveLocked(dump, buffers);
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buffers.clear();
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dumpHistoricalLocked(dump, skipList);
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}
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} finally {
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nFinishDump(dump);
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}
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}
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private static native int nGetAshmemSize();
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private static native long nCreateDump(int outFd, boolean isProto);
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private static native void nAddToDump(long dump, String path, String packageName,
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long versionCode, long startTime, long endTime, byte[] data);
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private static native void nAddToDump(long dump, String path);
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private static native void nFinishDump(long dump);
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private static native void nSaveBuffer(String path, String packageName, long versionCode,
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long startTime, long endTime, byte[] data);
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private final class BufferInfo {
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final String packageName;
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final long versionCode;
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long startTime;
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long endTime;
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BufferInfo(String packageName, long versionCode, long startTime) {
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this.packageName = packageName;
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this.versionCode = versionCode;
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this.startTime = startTime;
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}
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}
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private final class ActiveBuffer implements DeathRecipient {
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final BufferInfo mInfo;
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final int mUid;
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final int mPid;
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final IGraphicsStatsCallback mCallback;
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final IBinder mToken;
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MemoryFile mProcessBuffer;
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ActiveBuffer(IGraphicsStatsCallback token, int uid, int pid, String packageName,
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long versionCode)
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throws RemoteException, IOException {
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mInfo = new BufferInfo(packageName, versionCode, System.currentTimeMillis());
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mUid = uid;
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mPid = pid;
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mCallback = token;
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mToken = mCallback.asBinder();
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mToken.linkToDeath(this, 0);
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mProcessBuffer = new MemoryFile("GFXStats-" + pid, ASHMEM_SIZE);
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mProcessBuffer.writeBytes(ZERO_DATA, 0, 0, ASHMEM_SIZE);
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}
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@Override
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public void binderDied() {
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mToken.unlinkToDeath(this, 0);
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processDied(this);
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}
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void closeAllBuffers() {
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if (mProcessBuffer != null) {
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mProcessBuffer.close();
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mProcessBuffer = null;
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}
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}
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}
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private final class HistoricalBuffer {
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final BufferInfo mInfo;
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final byte[] mData = new byte[ASHMEM_SIZE];
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HistoricalBuffer(ActiveBuffer active) throws IOException {
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mInfo = active.mInfo;
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mInfo.endTime = System.currentTimeMillis();
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active.mProcessBuffer.readBytes(mData, 0, 0, ASHMEM_SIZE);
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}
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}
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}
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