Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [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.internal.os; |
| 18 | |
| 19 | import android.annotation.Nullable; |
Sudheer Shanka | 0085752 | 2017-07-06 18:28:14 -0700 | [diff] [blame] | 20 | import android.os.SystemClock; |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 21 | import android.util.Slog; |
| 22 | import android.util.SparseArray; |
Sudheer Shanka | 0085752 | 2017-07-06 18:28:14 -0700 | [diff] [blame] | 23 | import android.util.TimeUtils; |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 24 | |
| 25 | import com.android.internal.annotations.VisibleForTesting; |
| 26 | |
| 27 | import java.io.BufferedReader; |
| 28 | import java.io.FileReader; |
| 29 | import java.io.IOException; |
| 30 | |
| 31 | /** |
| 32 | * Reads /proc/uid_time_in_state which has the format: |
| 33 | * |
| 34 | * uid: [freq1] [freq2] [freq3] ... |
| 35 | * [uid1]: [time in freq1] [time in freq2] [time in freq3] ... |
| 36 | * [uid2]: [time in freq1] [time in freq2] [time in freq3] ... |
| 37 | * ... |
| 38 | * |
| 39 | * This provides the times a UID's processes spent executing at each different cpu frequency. |
| 40 | * The file contains a monotonically increasing count of time for a single boot. This class |
| 41 | * maintains the previous results of a call to {@link #readDelta} in order to provide a proper |
| 42 | * delta. |
| 43 | */ |
| 44 | public class KernelUidCpuFreqTimeReader { |
| 45 | private static final String TAG = "KernelUidCpuFreqTimeReader"; |
| 46 | private static final String UID_TIMES_PROC_FILE = "/proc/uid_time_in_state"; |
| 47 | |
| 48 | public interface Callback { |
| 49 | void onCpuFreqs(long[] cpuFreqs); |
| 50 | void onUidCpuFreqTime(int uid, long[] cpuFreqTimeMs); |
| 51 | } |
| 52 | |
| 53 | private long[] mCpuFreqs; |
| 54 | private int mCpuFreqsCount; |
Sudheer Shanka | 0085752 | 2017-07-06 18:28:14 -0700 | [diff] [blame] | 55 | private long mLastTimeReadMs; |
| 56 | private long mNowTimeMs; |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 57 | |
| 58 | private SparseArray<long[]> mLastUidCpuFreqTimeMs = new SparseArray<>(); |
| 59 | |
Sudheer Shanka | acd7f2c | 2017-06-01 17:39:40 -0700 | [diff] [blame] | 60 | // We check the existence of proc file a few times (just in case it is not ready yet when we |
| 61 | // start reading) and if it is not available, we simply ignore further read requests. |
| 62 | private static final int TOTAL_READ_ERROR_COUNT = 5; |
| 63 | private int mReadErrorCounter; |
| 64 | private boolean mProcFileAvailable; |
| 65 | |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 66 | public void readDelta(@Nullable Callback callback) { |
Sudheer Shanka | acd7f2c | 2017-06-01 17:39:40 -0700 | [diff] [blame] | 67 | if (!mProcFileAvailable && mReadErrorCounter >= TOTAL_READ_ERROR_COUNT) { |
| 68 | return; |
| 69 | } |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 70 | try (BufferedReader reader = new BufferedReader(new FileReader(UID_TIMES_PROC_FILE))) { |
Sudheer Shanka | 0085752 | 2017-07-06 18:28:14 -0700 | [diff] [blame] | 71 | mNowTimeMs = SystemClock.elapsedRealtime(); |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 72 | readDelta(reader, callback); |
Sudheer Shanka | 0085752 | 2017-07-06 18:28:14 -0700 | [diff] [blame] | 73 | mLastTimeReadMs = mNowTimeMs; |
Sudheer Shanka | acd7f2c | 2017-06-01 17:39:40 -0700 | [diff] [blame] | 74 | mProcFileAvailable = true; |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 75 | } catch (IOException e) { |
Sudheer Shanka | acd7f2c | 2017-06-01 17:39:40 -0700 | [diff] [blame] | 76 | mReadErrorCounter++; |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 77 | Slog.e(TAG, "Failed to read " + UID_TIMES_PROC_FILE + ": " + e); |
| 78 | } |
| 79 | } |
| 80 | |
Sudheer Shanka | 6d8dcec | 2017-06-01 12:09:03 -0700 | [diff] [blame] | 81 | public void removeUid(int uid) { |
| 82 | mLastUidCpuFreqTimeMs.delete(uid); |
| 83 | } |
| 84 | |
Suprabh Shukla | e6e723d | 2017-06-14 16:14:43 -0700 | [diff] [blame] | 85 | public void removeUidsInRange(int startUid, int endUid) { |
| 86 | if (endUid < startUid) { |
| 87 | return; |
| 88 | } |
| 89 | mLastUidCpuFreqTimeMs.put(startUid, null); |
| 90 | mLastUidCpuFreqTimeMs.put(endUid, null); |
| 91 | final int firstIndex = mLastUidCpuFreqTimeMs.indexOfKey(startUid); |
| 92 | final int lastIndex = mLastUidCpuFreqTimeMs.indexOfKey(endUid); |
| 93 | mLastUidCpuFreqTimeMs.removeAtRange(firstIndex, lastIndex - firstIndex + 1); |
| 94 | } |
| 95 | |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 96 | @VisibleForTesting |
| 97 | public void readDelta(BufferedReader reader, @Nullable Callback callback) throws IOException { |
| 98 | String line = reader.readLine(); |
| 99 | if (line == null) { |
| 100 | return; |
| 101 | } |
| 102 | readCpuFreqs(line, callback); |
| 103 | while ((line = reader.readLine()) != null) { |
| 104 | final int index = line.indexOf(' '); |
| 105 | final int uid = Integer.parseInt(line.substring(0, index - 1), 10); |
| 106 | readTimesForUid(uid, line.substring(index + 1, line.length()), callback); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | private void readTimesForUid(int uid, String line, Callback callback) { |
| 111 | long[] uidTimeMs = mLastUidCpuFreqTimeMs.get(uid); |
| 112 | if (uidTimeMs == null) { |
| 113 | uidTimeMs = new long[mCpuFreqsCount]; |
| 114 | mLastUidCpuFreqTimeMs.put(uid, uidTimeMs); |
| 115 | } |
| 116 | final String[] timesStr = line.split(" "); |
| 117 | final int size = timesStr.length; |
| 118 | if (size != uidTimeMs.length) { |
| 119 | Slog.e(TAG, "No. of readings don't match cpu freqs, readings: " + size |
| 120 | + " cpuFreqsCount: " + uidTimeMs.length); |
| 121 | return; |
| 122 | } |
| 123 | final long[] deltaUidTimeMs = new long[size]; |
Sudheer Shanka | 0085752 | 2017-07-06 18:28:14 -0700 | [diff] [blame] | 124 | final long[] curUidTimeMs = new long[size]; |
Sudheer Shanka | 97d15bf | 2017-06-19 19:19:08 -0700 | [diff] [blame] | 125 | boolean notify = false; |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 126 | for (int i = 0; i < size; ++i) { |
| 127 | // Times read will be in units of 10ms |
| 128 | final long totalTimeMs = Long.parseLong(timesStr[i], 10) * 10; |
| 129 | deltaUidTimeMs[i] = totalTimeMs - uidTimeMs[i]; |
Sudheer Shanka | 0085752 | 2017-07-06 18:28:14 -0700 | [diff] [blame] | 130 | // If there is malformed data for any uid, then we just log about it and ignore |
| 131 | // the data for that uid. |
| 132 | if (deltaUidTimeMs[i] < 0 || totalTimeMs < 0) { |
| 133 | final StringBuilder sb = new StringBuilder("Malformed cpu freq data for UID=") |
| 134 | .append(uid).append("\n"); |
| 135 | sb.append("data=").append("(").append(uidTimeMs[i]).append(",") |
| 136 | .append(totalTimeMs).append(")").append("\n"); |
Sudheer Shanka | 40c43f1 | 2017-08-08 15:44:09 -0700 | [diff] [blame] | 137 | sb.append("times=").append("("); |
| 138 | TimeUtils.formatDuration(mLastTimeReadMs, sb); sb.append(","); |
| 139 | TimeUtils.formatDuration(mNowTimeMs, sb); sb.append(")"); |
Sudheer Shanka | 8cde930 | 2017-08-23 11:29:23 -0700 | [diff] [blame] | 140 | Slog.e(TAG, sb.toString()); |
Sudheer Shanka | 0085752 | 2017-07-06 18:28:14 -0700 | [diff] [blame] | 141 | return; |
| 142 | } |
| 143 | curUidTimeMs[i] = totalTimeMs; |
Sudheer Shanka | 97d15bf | 2017-06-19 19:19:08 -0700 | [diff] [blame] | 144 | notify = notify || (deltaUidTimeMs[i] > 0); |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 145 | } |
Sudheer Shanka | 0085752 | 2017-07-06 18:28:14 -0700 | [diff] [blame] | 146 | if (notify) { |
| 147 | System.arraycopy(curUidTimeMs, 0, uidTimeMs, 0, size); |
| 148 | if (callback != null) { |
| 149 | callback.onUidCpuFreqTime(uid, deltaUidTimeMs); |
| 150 | } |
Sudheer Shanka | 9b735c5 | 2017-05-09 18:26:18 -0700 | [diff] [blame] | 151 | } |
| 152 | } |
| 153 | |
| 154 | private void readCpuFreqs(String line, Callback callback) { |
| 155 | if (mCpuFreqs == null) { |
| 156 | final String[] freqStr = line.split(" "); |
| 157 | // First item would be "uid:" which needs to be ignored |
| 158 | mCpuFreqsCount = freqStr.length - 1; |
| 159 | mCpuFreqs = new long[mCpuFreqsCount]; |
| 160 | for (int i = 0; i < mCpuFreqsCount; ++i) { |
| 161 | mCpuFreqs[i] = Long.parseLong(freqStr[i + 1], 10); |
| 162 | } |
| 163 | } |
| 164 | if (callback != null) { |
| 165 | callback.onCpuFreqs(mCpuFreqs); |
| 166 | } |
| 167 | } |
| 168 | } |