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.car.storagemonitoring; 18 19 import android.car.storagemonitoring.IoStatsEntry; 20 import android.car.storagemonitoring.UidIoRecord; 21 import android.util.SparseArray; 22 23 import com.android.car.procfsinspector.ProcessInfo; 24 import com.android.car.systeminterface.SystemStateInterface; 25 import com.android.internal.annotations.GuardedBy; 26 27 import java.util.List; 28 import java.util.Optional; 29 30 /** 31 * @deprecated use {@link com.android.car.watchdog.CarWatchdogService} and its related classes 32 * for I/O related tasks. 33 */ 34 @Deprecated 35 public class IoStatsTracker { 36 37 // NOTE: this class is not thread safe 38 private abstract static class Lazy<T> { 39 protected Optional<T> mLazy = Optional.empty(); 40 supply()41 protected abstract T supply(); 42 get()43 public T get() { 44 if (!mLazy.isPresent()) { 45 mLazy = Optional.of(supply()); 46 } 47 return mLazy.get(); 48 } 49 } 50 51 private final Object mLock = new Object(); 52 private final long mSampleWindowMs; 53 private final SystemStateInterface mSystemStateInterface; 54 @GuardedBy("mLock") 55 private SparseArray<IoStatsEntry> mTotal; 56 @GuardedBy("mLock") 57 private SparseArray<IoStatsEntry> mCurrentSample; 58 IoStatsTracker(List<IoStatsEntry> initialValue, long sampleWindowMs, SystemStateInterface systemStateInterface)59 public IoStatsTracker(List<IoStatsEntry> initialValue, 60 long sampleWindowMs, SystemStateInterface systemStateInterface) { 61 mTotal = new SparseArray<>(initialValue.size()); 62 for (int i = 0; i < initialValue.size(); i++) { 63 IoStatsEntry uidIoStats = initialValue.get(i); 64 mTotal.append(uidIoStats.uid, uidIoStats); 65 } 66 mCurrentSample = mTotal.clone(); 67 mSampleWindowMs = sampleWindowMs; 68 mSystemStateInterface = systemStateInterface; 69 } 70 71 /** 72 * Updates the tracker information with new metrics. 73 */ update(SparseArray<UidIoRecord> newMetrics)74 public void update(SparseArray<UidIoRecord> newMetrics) { 75 final Lazy<List<ProcessInfo>> processTable = new Lazy<List<ProcessInfo>>() { 76 @Override 77 protected List<ProcessInfo> supply() { 78 return mSystemStateInterface.getRunningProcesses(); 79 } 80 }; 81 82 SparseArray<IoStatsEntry> newSample = new SparseArray<>(); 83 SparseArray<IoStatsEntry> newTotal = new SparseArray<>(); 84 85 synchronized (mLock) { 86 // prepare the new values 87 for (int i = 0; i < newMetrics.size(); i++) { 88 UidIoRecord newRecord = newMetrics.valueAt(i); 89 final int uid = newRecord.uid; 90 final IoStatsEntry oldRecord = mTotal.get(uid); 91 92 IoStatsEntry newStats = null; 93 94 if (oldRecord == null) { 95 // this user id has just showed up, so just add it to the current sample 96 // and its runtime is the size of our sample window 97 newStats = new IoStatsEntry(newRecord, mSampleWindowMs); 98 } else { 99 // this user id has already been detected 100 101 if (oldRecord.representsSameMetrics(newRecord)) { 102 // if no new I/O happened, try to figure out if any process on behalf 103 // of this user has happened, and use that to update the runtime metrics 104 for (int index = 0; index < processTable.get().size(); index++) { 105 if (processTable.get().get(index).uid == uid) { 106 newStats = new IoStatsEntry(newRecord.delta(oldRecord), 107 oldRecord.runtimeMillis + mSampleWindowMs); 108 break; 109 } 110 } 111 // if no new I/O happened and no process is running for this user 112 // then do not prepare a new sample, as nothing has changed 113 } else { 114 // but if new I/O happened, assume something was running for the entire 115 // sample window and compute the delta 116 newStats = new IoStatsEntry(newRecord.delta(oldRecord), 117 oldRecord.runtimeMillis + mSampleWindowMs); 118 } 119 } 120 121 if (newStats != null) { 122 newSample.put(uid, newStats); 123 newTotal.append(uid, new IoStatsEntry(newRecord, newStats.runtimeMillis)); 124 } else { 125 // if oldRecord were null, newStats would be != null and we wouldn't be here 126 newTotal.append(uid, oldRecord); 127 } 128 } 129 130 // now update the stored values 131 mCurrentSample = newSample; 132 mTotal = newTotal; 133 } 134 } 135 136 /** 137 * Returns all IO stats entries. 138 */ getTotal()139 public SparseArray<IoStatsEntry> getTotal() { 140 synchronized (mLock) { 141 return mTotal.clone(); 142 } 143 } 144 145 /** 146 * Return newly added IO stats entries. 147 */ getCurrentSample()148 public SparseArray<IoStatsEntry> getCurrentSample() { 149 synchronized (mLock) { 150 return mCurrentSample.clone(); 151 } 152 } 153 } 154