| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server; |
| |
| import android.os.SystemClock; |
| import android.util.proto.ProtoOutputStream; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.server.StatLoggerProto.Event; |
| |
| import java.io.PrintWriter; |
| |
| /** |
| * Simple class to keep track of the number of times certain events happened and their durations for |
| * benchmarking. |
| * |
| * TODO Update shortcut service to switch to it. |
| * |
| * @hide |
| */ |
| public class StatLogger { |
| private final Object mLock = new Object(); |
| |
| private final int SIZE; |
| |
| @GuardedBy("mLock") |
| private final int[] mCountStats; |
| |
| @GuardedBy("mLock") |
| private final long[] mDurationStats; |
| |
| private final String[] mLabels; |
| |
| public StatLogger(String[] eventLabels) { |
| SIZE = eventLabels.length; |
| mCountStats = new int[SIZE]; |
| mDurationStats = new long[SIZE]; |
| mLabels = eventLabels; |
| } |
| |
| /** |
| * Return the current time in the internal time unit. |
| * Call it before an event happens, and |
| * give it back to the {@link #logDurationStat(int, long)}} after the event. |
| */ |
| public long getTime() { |
| return SystemClock.elapsedRealtimeNanos() / 1000; |
| } |
| |
| /** |
| * @see {@link #getTime()} |
| */ |
| public void logDurationStat(int eventId, long start) { |
| synchronized (mLock) { |
| mCountStats[eventId]++; |
| mDurationStats[eventId] += (getTime() - start); |
| } |
| } |
| |
| public void dump(PrintWriter pw, String prefix) { |
| synchronized (mLock) { |
| pw.print(prefix); |
| pw.println("Stats:"); |
| for (int i = 0; i < SIZE; i++) { |
| pw.print(prefix); |
| pw.print(" "); |
| final int count = mCountStats[i]; |
| final double durationMs = mDurationStats[i] / 1000.0; |
| pw.println(String.format("%s: count=%d, total=%.1fms, avg=%.3fms", |
| mLabels[i], count, durationMs, |
| (count == 0 ? 0 : ((double) durationMs) / count))); |
| } |
| } |
| } |
| |
| public void dumpProto(ProtoOutputStream proto, long fieldId) { |
| synchronized (mLock) { |
| final long outer = proto.start(fieldId); |
| |
| for (int i = 0; i < mLabels.length; i++) { |
| final long inner = proto.start(StatLoggerProto.EVENTS); |
| |
| proto.write(Event.EVENT_ID, i); |
| proto.write(Event.LABEL, mLabels[i]); |
| proto.write(Event.COUNT, mCountStats[i]); |
| proto.write(Event.TOTAL_DURATION_MICROS, mDurationStats[i]); |
| |
| proto.end(inner); |
| } |
| |
| proto.end(outer); |
| } |
| } |
| } |