Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 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.am; |
| 18 | |
| 19 | import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_METRICS; |
| 20 | import static com.android.server.am.ActivityManagerDebugConfig.TAG_AM; |
| 21 | import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME; |
| 22 | |
| 23 | import android.annotation.Nullable; |
| 24 | import android.os.FileUtils; |
| 25 | import android.util.Slog; |
| 26 | |
| 27 | import com.android.internal.annotations.VisibleForTesting; |
| 28 | |
| 29 | import java.io.File; |
| 30 | import java.io.IOException; |
Rajeev Kumar | 22d92b7 | 2018-02-07 18:38:36 -0800 | [diff] [blame] | 31 | import java.util.Locale; |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 32 | import java.util.regex.Matcher; |
| 33 | import java.util.regex.Pattern; |
| 34 | |
| 35 | /** |
| 36 | * Static utility methods related to {@link MemoryStat}. |
| 37 | */ |
| 38 | final class MemoryStatUtil { |
| 39 | private static final String TAG = TAG_WITH_CLASS_NAME ? "MemoryStatUtil" : TAG_AM; |
| 40 | |
Rajeev Kumar | bfcd920 | 2018-03-02 22:42:13 +0000 | [diff] [blame] | 41 | /** Path to check if device has memcg */ |
| 42 | private static final String MEMCG_TEST_PATH = "/dev/memcg/apps/memory.stat"; |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 43 | /** Path to memory stat file for logging app start memory state */ |
| 44 | private static final String MEMORY_STAT_FILE_FMT = "/dev/memcg/apps/uid_%d/pid_%d/memory.stat"; |
Rajeev Kumar | bfcd920 | 2018-03-02 22:42:13 +0000 | [diff] [blame] | 45 | /** Path to procfs stat file for logging app start memory state */ |
| 46 | private static final String PROC_STAT_FILE_FMT = "/proc/%d/stat"; |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 47 | |
| 48 | private static final Pattern PGFAULT = Pattern.compile("total_pgfault (\\d+)"); |
| 49 | private static final Pattern PGMAJFAULT = Pattern.compile("total_pgmajfault (\\d+)"); |
| 50 | private static final Pattern RSS_IN_BYTES = Pattern.compile("total_rss (\\d+)"); |
| 51 | private static final Pattern CACHE_IN_BYTES = Pattern.compile("total_cache (\\d+)"); |
| 52 | private static final Pattern SWAP_IN_BYTES = Pattern.compile("total_swap (\\d+)"); |
| 53 | |
Rajeev Kumar | bfcd920 | 2018-03-02 22:42:13 +0000 | [diff] [blame] | 54 | private static final int PGFAULT_INDEX = 9; |
| 55 | private static final int PGMAJFAULT_INDEX = 11; |
| 56 | private static final int RSS_IN_BYTES_INDEX = 23; |
| 57 | |
| 58 | /** True if device has memcg */ |
| 59 | private static volatile Boolean sDeviceHasMemCg; |
| 60 | |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 61 | private MemoryStatUtil() {} |
| 62 | |
| 63 | /** |
Rajeev Kumar | bfcd920 | 2018-03-02 22:42:13 +0000 | [diff] [blame] | 64 | * Reads memory stat for a process. |
| 65 | * |
| 66 | * Reads from memcg if available on device, else fallback to procfs. |
| 67 | * Returns null if no stats can be read. |
| 68 | */ |
| 69 | @Nullable |
| 70 | static MemoryStat readMemoryStatFromFilesystem(int uid, int pid) { |
| 71 | return hasMemcg() ? readMemoryStatFromMemcg(uid, pid) : readMemoryStatFromProcfs(pid); |
| 72 | } |
| 73 | |
| 74 | /** |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 75 | * Reads memory.stat of a process from memcg. |
Rajeev Kumar | bfcd920 | 2018-03-02 22:42:13 +0000 | [diff] [blame] | 76 | * |
| 77 | * Returns null if file is not found in memcg or if file has unrecognized contents. |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 78 | */ |
Rajeev Kumar | 22d92b7 | 2018-02-07 18:38:36 -0800 | [diff] [blame] | 79 | @Nullable |
| 80 | static MemoryStat readMemoryStatFromMemcg(int uid, int pid) { |
Rajeev Kumar | bfcd920 | 2018-03-02 22:42:13 +0000 | [diff] [blame] | 81 | final String path = String.format(Locale.US, MEMORY_STAT_FILE_FMT, uid, pid); |
| 82 | return parseMemoryStatFromMemcg(readFileContents(path)); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Reads memory stat of a process from procfs. |
| 87 | * |
| 88 | * Returns null if file is not found in procfs or if file has unrecognized contents. |
| 89 | */ |
| 90 | @Nullable |
| 91 | static MemoryStat readMemoryStatFromProcfs(int pid) { |
| 92 | final String path = String.format(Locale.US, PROC_STAT_FILE_FMT, pid); |
| 93 | return parseMemoryStatFromProcfs(readFileContents(path)); |
| 94 | } |
| 95 | |
| 96 | private static String readFileContents(String path) { |
| 97 | final File file = new File(path); |
| 98 | if (!file.exists()) { |
| 99 | if (DEBUG_METRICS) Slog.i(TAG, path + " not found"); |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 100 | return null; |
| 101 | } |
| 102 | |
| 103 | try { |
Rajeev Kumar | bfcd920 | 2018-03-02 22:42:13 +0000 | [diff] [blame] | 104 | return FileUtils.readTextFile(file, 0 /* max */, null /* ellipsis */); |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 105 | } catch (IOException e) { |
| 106 | Slog.e(TAG, "Failed to read file:", e); |
| 107 | return null; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Parses relevant statistics out from the contents of a memory.stat file in memcg. |
| 113 | */ |
| 114 | @VisibleForTesting(visibility = VisibleForTesting.Visibility.PRIVATE) |
Rajeev Kumar | 22d92b7 | 2018-02-07 18:38:36 -0800 | [diff] [blame] | 115 | @Nullable |
Rajeev Kumar | bfcd920 | 2018-03-02 22:42:13 +0000 | [diff] [blame] | 116 | static MemoryStat parseMemoryStatFromMemcg(String memoryStatContents) { |
| 117 | if (memoryStatContents == null || memoryStatContents.isEmpty()) { |
| 118 | return null; |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 119 | } |
| 120 | |
Rajeev Kumar | bfcd920 | 2018-03-02 22:42:13 +0000 | [diff] [blame] | 121 | final MemoryStat memoryStat = new MemoryStat(); |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 122 | Matcher m; |
| 123 | m = PGFAULT.matcher(memoryStatContents); |
| 124 | memoryStat.pgfault = m.find() ? Long.valueOf(m.group(1)) : 0; |
| 125 | m = PGMAJFAULT.matcher(memoryStatContents); |
| 126 | memoryStat.pgmajfault = m.find() ? Long.valueOf(m.group(1)) : 0; |
| 127 | m = RSS_IN_BYTES.matcher(memoryStatContents); |
| 128 | memoryStat.rssInBytes = m.find() ? Long.valueOf(m.group(1)) : 0; |
| 129 | m = CACHE_IN_BYTES.matcher(memoryStatContents); |
| 130 | memoryStat.cacheInBytes = m.find() ? Long.valueOf(m.group(1)) : 0; |
| 131 | m = SWAP_IN_BYTES.matcher(memoryStatContents); |
| 132 | memoryStat.swapInBytes = m.find() ? Long.valueOf(m.group(1)) : 0; |
| 133 | return memoryStat; |
| 134 | } |
| 135 | |
Rajeev Kumar | bfcd920 | 2018-03-02 22:42:13 +0000 | [diff] [blame] | 136 | /** |
| 137 | * Parses relevant statistics out from the contents of a /proc/pid/stat file in procfs. |
| 138 | */ |
| 139 | @VisibleForTesting(visibility = VisibleForTesting.Visibility.PRIVATE) |
| 140 | @Nullable |
| 141 | static MemoryStat parseMemoryStatFromProcfs(String procStatContents) { |
| 142 | if (procStatContents == null || procStatContents.isEmpty()) { |
| 143 | return null; |
| 144 | } |
| 145 | |
| 146 | final String[] splits = procStatContents.split(" "); |
| 147 | if (splits.length < 24) { |
| 148 | return null; |
| 149 | } |
| 150 | |
| 151 | final MemoryStat memoryStat = new MemoryStat(); |
| 152 | memoryStat.pgfault = Long.valueOf(splits[PGFAULT_INDEX]); |
| 153 | memoryStat.pgmajfault = Long.valueOf(splits[PGMAJFAULT_INDEX]); |
| 154 | memoryStat.rssInBytes = Long.valueOf(splits[RSS_IN_BYTES_INDEX]); |
| 155 | return memoryStat; |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Checks if memcg is available on device. |
| 160 | * |
| 161 | * Touches the filesystem to do the check. |
| 162 | */ |
| 163 | static boolean hasMemcg() { |
| 164 | if (sDeviceHasMemCg == null) { |
| 165 | sDeviceHasMemCg = (new File(MEMCG_TEST_PATH)).exists(); |
| 166 | } |
| 167 | return sDeviceHasMemCg; |
| 168 | } |
| 169 | |
Ng Zhi An | bbefdec | 2018-01-30 17:12:39 -0800 | [diff] [blame] | 170 | static final class MemoryStat { |
| 171 | /** Number of page faults */ |
| 172 | long pgfault; |
| 173 | /** Number of major page faults */ |
| 174 | long pgmajfault; |
| 175 | /** Number of bytes of anonymous and swap cache memory */ |
| 176 | long rssInBytes; |
| 177 | /** Number of bytes of page cache memory */ |
| 178 | long cacheInBytes; |
| 179 | /** Number of bytes of swap usage */ |
| 180 | long swapInBytes; |
| 181 | } |
Ng Zhi An | f39efa1 | 2018-02-22 14:06:33 -0800 | [diff] [blame] | 182 | } |