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 17package com.android.server.am; 18 19import android.content.ContentResolver; 20import android.database.ContentObserver; 21import android.net.Uri; 22import android.os.Handler; 23import android.provider.Settings; 24import android.util.KeyValueListParser; 25import android.util.Slog; 26 27import java.io.PrintWriter; 28 29import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_POWER_QUICK; 30 31/** 32 * Settings constants that can modify the activity manager's behavior. 33 */ 34final class ActivityManagerConstants extends ContentObserver { 35 // Key names stored in the settings value. 36 private static final String KEY_MAX_CACHED_PROCESSES = "max_cached_processes"; 37 private static final String KEY_BACKGROUND_SETTLE_TIME = "background_settle_time"; 38 private static final String KEY_FGSERVICE_MIN_SHOWN_TIME 39 = "fgservice_min_shown_time"; 40 private static final String KEY_FGSERVICE_MIN_REPORT_TIME 41 = "fgservice_min_report_time"; 42 private static final String KEY_FGSERVICE_SCREEN_ON_BEFORE_TIME 43 = "fgservice_screen_on_before_time"; 44 private static final String KEY_FGSERVICE_SCREEN_ON_AFTER_TIME 45 = "fgservice_screen_on_after_time"; 46 private static final String KEY_CONTENT_PROVIDER_RETAIN_TIME = "content_provider_retain_time"; 47 private static final String KEY_GC_TIMEOUT = "gc_timeout"; 48 private static final String KEY_GC_MIN_INTERVAL = "gc_min_interval"; 49 private static final String KEY_FULL_PSS_MIN_INTERVAL = "full_pss_min_interval"; 50 private static final String KEY_FULL_PSS_LOWERED_INTERVAL = "full_pss_lowered_interval"; 51 private static final String KEY_POWER_CHECK_DELAY = "power_check_delay"; 52 private static final String KEY_WAKE_LOCK_MIN_CHECK_DURATION = "wake_lock_min_check_duration"; 53 private static final String KEY_CPU_MIN_CHECK_DURATION = "cpu_min_check_duration"; 54 private static final String KEY_SERVICE_USAGE_INTERACTION_TIME 55 = "service_usage_interaction_time"; 56 private static final String KEY_USAGE_STATS_INTERACTION_INTERVAL 57 = "usage_stats_interaction_interval"; 58 static final String KEY_SERVICE_RESTART_DURATION = "service_restart_duration"; 59 static final String KEY_SERVICE_RESET_RUN_DURATION = "service_reset_run_duration"; 60 static final String KEY_SERVICE_RESTART_DURATION_FACTOR = "service_restart_duration_factor"; 61 static final String KEY_SERVICE_MIN_RESTART_TIME_BETWEEN = "service_min_restart_time_between"; 62 static final String KEY_MAX_SERVICE_INACTIVITY = "service_max_inactivity"; 63 static final String KEY_BG_START_TIMEOUT = "service_bg_start_timeout"; 64 65 private static final int DEFAULT_MAX_CACHED_PROCESSES = 32; 66 private static final long DEFAULT_BACKGROUND_SETTLE_TIME = 60*1000; 67 private static final long DEFAULT_FGSERVICE_MIN_SHOWN_TIME = 2*1000; 68 private static final long DEFAULT_FGSERVICE_MIN_REPORT_TIME = 3*1000; 69 private static final long DEFAULT_FGSERVICE_SCREEN_ON_BEFORE_TIME = 1*1000; 70 private static final long DEFAULT_FGSERVICE_SCREEN_ON_AFTER_TIME = 5*1000; 71 private static final long DEFAULT_CONTENT_PROVIDER_RETAIN_TIME = 20*1000; 72 private static final long DEFAULT_GC_TIMEOUT = 5*1000; 73 private static final long DEFAULT_GC_MIN_INTERVAL = 60*1000; 74 private static final long DEFAULT_FULL_PSS_MIN_INTERVAL = 10*60*1000; 75 private static final long DEFAULT_FULL_PSS_LOWERED_INTERVAL = 2*60*1000; 76 private static final long DEFAULT_POWER_CHECK_DELAY = (DEBUG_POWER_QUICK ? 2 : 15) * 60*1000; 77 private static final long DEFAULT_WAKE_LOCK_MIN_CHECK_DURATION 78 = (DEBUG_POWER_QUICK ? 1 : 5) * 60*1000; 79 private static final long DEFAULT_CPU_MIN_CHECK_DURATION 80 = (DEBUG_POWER_QUICK ? 1 : 5) * 60*1000; 81 private static final long DEFAULT_SERVICE_USAGE_INTERACTION_TIME = 30*60*1000; 82 private static final long DEFAULT_USAGE_STATS_INTERACTION_INTERVAL = 24*60*60*1000L; 83 private static final long DEFAULT_SERVICE_RESTART_DURATION = 1*1000; 84 private static final long DEFAULT_SERVICE_RESET_RUN_DURATION = 60*1000; 85 private static final int DEFAULT_SERVICE_RESTART_DURATION_FACTOR = 4; 86 private static final long DEFAULT_SERVICE_MIN_RESTART_TIME_BETWEEN = 10*1000; 87 private static final long DEFAULT_MAX_SERVICE_INACTIVITY = 30*60*1000; 88 private static final long DEFAULT_BG_START_TIMEOUT = 15*1000; 89 90 // Maximum number of cached processes we will allow. 91 public int MAX_CACHED_PROCESSES = DEFAULT_MAX_CACHED_PROCESSES; 92 93 // This is the amount of time we allow an app to settle after it goes into the background, 94 // before we start restricting what it can do. 95 public long BACKGROUND_SETTLE_TIME = DEFAULT_BACKGROUND_SETTLE_TIME; 96 97 // The minimum time we allow a foreground service to run with a notification and the 98 // screen on without otherwise telling the user about it. (If it runs for less than this, 99 // it will still be reported to the user as a running app for at least this amount of time.) 100 public long FGSERVICE_MIN_SHOWN_TIME = DEFAULT_FGSERVICE_MIN_SHOWN_TIME; 101 102 // If a foreground service is shown for less than FGSERVICE_MIN_SHOWN_TIME, we will display 103 // the background app running notification about it for at least this amount of time (if it 104 // is larger than the remaining shown time). 105 public long FGSERVICE_MIN_REPORT_TIME = DEFAULT_FGSERVICE_MIN_REPORT_TIME; 106 107 // The minimum amount of time the foreground service needs to have remain being shown 108 // before the screen goes on for us to consider it not worth showing to the user. That is 109 // if an app has a foreground service that stops itself this amount of time or more before 110 // the user turns on the screen, we will just let it go without the user being told about it. 111 public long FGSERVICE_SCREEN_ON_BEFORE_TIME = DEFAULT_FGSERVICE_SCREEN_ON_BEFORE_TIME; 112 113 // The minimum amount of time a foreground service should remain reported to the user if 114 // it is stopped when the screen turns on. This is the time from when the screen turns 115 // on until we will stop reporting it. 116 public long FGSERVICE_SCREEN_ON_AFTER_TIME = DEFAULT_FGSERVICE_SCREEN_ON_AFTER_TIME; 117 118 // How long we will retain processes hosting content providers in the "last activity" 119 // state before allowing them to drop down to the regular cached LRU list. This is 120 // to avoid thrashing of provider processes under low memory situations. 121 long CONTENT_PROVIDER_RETAIN_TIME = DEFAULT_CONTENT_PROVIDER_RETAIN_TIME; 122 123 // How long to wait after going idle before forcing apps to GC. 124 long GC_TIMEOUT = DEFAULT_GC_TIMEOUT; 125 126 // The minimum amount of time between successive GC requests for a process. 127 long GC_MIN_INTERVAL = DEFAULT_GC_MIN_INTERVAL; 128 129 // The minimum amount of time between successive PSS requests for a process. 130 long FULL_PSS_MIN_INTERVAL = DEFAULT_FULL_PSS_MIN_INTERVAL; 131 132 // The minimum amount of time between successive PSS requests for a process 133 // when the request is due to the memory state being lowered. 134 long FULL_PSS_LOWERED_INTERVAL = DEFAULT_FULL_PSS_LOWERED_INTERVAL; 135 136 // The rate at which we check for apps using excessive power -- 15 mins. 137 long POWER_CHECK_DELAY = DEFAULT_POWER_CHECK_DELAY; 138 139 // The minimum sample duration we will allow before deciding we have 140 // enough data on wake locks to start killing things. 141 long WAKE_LOCK_MIN_CHECK_DURATION = DEFAULT_WAKE_LOCK_MIN_CHECK_DURATION; 142 143 // The minimum sample duration we will allow before deciding we have 144 // enough data on CPU usage to start killing things. 145 long CPU_MIN_CHECK_DURATION = DEFAULT_CPU_MIN_CHECK_DURATION; 146 147 // This is the amount of time an app needs to be running a foreground service before 148 // we will consider it to be doing interaction for usage stats. 149 long SERVICE_USAGE_INTERACTION_TIME = DEFAULT_SERVICE_USAGE_INTERACTION_TIME; 150 151 // Maximum amount of time we will allow to elapse before re-reporting usage stats 152 // interaction with foreground processes. 153 long USAGE_STATS_INTERACTION_INTERVAL = DEFAULT_USAGE_STATS_INTERACTION_INTERVAL; 154 155 // How long a service needs to be running until restarting its process 156 // is no longer considered to be a relaunch of the service. 157 public long SERVICE_RESTART_DURATION = DEFAULT_SERVICE_RESTART_DURATION; 158 159 // How long a service needs to be running until it will start back at 160 // SERVICE_RESTART_DURATION after being killed. 161 public long SERVICE_RESET_RUN_DURATION = DEFAULT_SERVICE_RESET_RUN_DURATION; 162 163 // Multiplying factor to increase restart duration time by, for each time 164 // a service is killed before it has run for SERVICE_RESET_RUN_DURATION. 165 public int SERVICE_RESTART_DURATION_FACTOR = DEFAULT_SERVICE_RESTART_DURATION_FACTOR; 166 167 // The minimum amount of time between restarting services that we allow. 168 // That is, when multiple services are restarting, we won't allow each 169 // to restart less than this amount of time from the last one. 170 public long SERVICE_MIN_RESTART_TIME_BETWEEN = DEFAULT_SERVICE_MIN_RESTART_TIME_BETWEEN; 171 172 // Maximum amount of time for there to be no activity on a service before 173 // we consider it non-essential and allow its process to go on the 174 // LRU background list. 175 public long MAX_SERVICE_INACTIVITY = DEFAULT_MAX_SERVICE_INACTIVITY; 176 177 // How long we wait for a background started service to stop itself before 178 // allowing the next pending start to run. 179 public long BG_START_TIMEOUT = DEFAULT_BG_START_TIMEOUT; 180 181 private final ActivityManagerService mService; 182 private ContentResolver mResolver; 183 private final KeyValueListParser mParser = new KeyValueListParser(','); 184 185 private int mOverrideMaxCachedProcesses = -1; 186 187 // The maximum number of cached processes we will keep around before killing them. 188 // NOTE: this constant is *only* a control to not let us go too crazy with 189 // keeping around processes on devices with large amounts of RAM. For devices that 190 // are tighter on RAM, the out of memory killer is responsible for killing background 191 // processes as RAM is needed, and we should *never* be relying on this limit to 192 // kill them. Also note that this limit only applies to cached background processes; 193 // we have no limit on the number of service, visible, foreground, or other such 194 // processes and the number of those processes does not count against the cached 195 // process limit. 196 public int CUR_MAX_CACHED_PROCESSES; 197 198 // The maximum number of empty app processes we will let sit around. 199 public int CUR_MAX_EMPTY_PROCESSES; 200 201 // The number of empty apps at which we don't consider it necessary to do 202 // memory trimming. 203 public int CUR_TRIM_EMPTY_PROCESSES; 204 205 // The number of cached at which we don't consider it necessary to do 206 // memory trimming. 207 public int CUR_TRIM_CACHED_PROCESSES; 208 209 public ActivityManagerConstants(ActivityManagerService service, Handler handler) { 210 super(handler); 211 mService = service; 212 updateMaxCachedProcesses(); 213 } 214 215 public void start(ContentResolver resolver) { 216 mResolver = resolver; 217 mResolver.registerContentObserver(Settings.Global.getUriFor( 218 Settings.Global.ACTIVITY_MANAGER_CONSTANTS), false, this); 219 updateConstants(); 220 } 221 222 public void setOverrideMaxCachedProcesses(int value) { 223 mOverrideMaxCachedProcesses = value; 224 updateMaxCachedProcesses(); 225 } 226 227 public int getOverrideMaxCachedProcesses() { 228 return mOverrideMaxCachedProcesses; 229 } 230 231 public static int computeEmptyProcessLimit(int totalProcessLimit) { 232 return totalProcessLimit/2; 233 } 234 235 @Override 236 public void onChange(boolean selfChange, Uri uri) { 237 updateConstants(); 238 } 239 240 private void updateConstants() { 241 final String setting = Settings.Global.getString(mResolver, 242 Settings.Global.ACTIVITY_MANAGER_CONSTANTS); 243 synchronized (mService) { 244 try { 245 mParser.setString(setting); 246 } catch (IllegalArgumentException e) { 247 // Failed to parse the settings string, log this and move on 248 // with defaults. 249 Slog.e("ActivityManagerConstants", "Bad activity manager config settings", e); 250 } 251 MAX_CACHED_PROCESSES = mParser.getInt(KEY_MAX_CACHED_PROCESSES, 252 DEFAULT_MAX_CACHED_PROCESSES); 253 BACKGROUND_SETTLE_TIME = mParser.getLong(KEY_BACKGROUND_SETTLE_TIME, 254 DEFAULT_BACKGROUND_SETTLE_TIME); 255 FGSERVICE_MIN_SHOWN_TIME = mParser.getLong(KEY_FGSERVICE_MIN_SHOWN_TIME, 256 DEFAULT_FGSERVICE_MIN_SHOWN_TIME); 257 FGSERVICE_MIN_REPORT_TIME = mParser.getLong(KEY_FGSERVICE_MIN_REPORT_TIME, 258 DEFAULT_FGSERVICE_MIN_REPORT_TIME); 259 FGSERVICE_SCREEN_ON_BEFORE_TIME = mParser.getLong(KEY_FGSERVICE_SCREEN_ON_BEFORE_TIME, 260 DEFAULT_FGSERVICE_SCREEN_ON_BEFORE_TIME); 261 FGSERVICE_SCREEN_ON_AFTER_TIME = mParser.getLong(KEY_FGSERVICE_SCREEN_ON_AFTER_TIME, 262 DEFAULT_FGSERVICE_SCREEN_ON_AFTER_TIME); 263 CONTENT_PROVIDER_RETAIN_TIME = mParser.getLong(KEY_CONTENT_PROVIDER_RETAIN_TIME, 264 DEFAULT_CONTENT_PROVIDER_RETAIN_TIME); 265 GC_TIMEOUT = mParser.getLong(KEY_GC_TIMEOUT, 266 DEFAULT_GC_TIMEOUT); 267 GC_MIN_INTERVAL = mParser.getLong(KEY_GC_MIN_INTERVAL, 268 DEFAULT_GC_MIN_INTERVAL); 269 FULL_PSS_MIN_INTERVAL = mParser.getLong(KEY_FULL_PSS_MIN_INTERVAL, 270 DEFAULT_FULL_PSS_MIN_INTERVAL); 271 FULL_PSS_LOWERED_INTERVAL = mParser.getLong(KEY_FULL_PSS_LOWERED_INTERVAL, 272 DEFAULT_FULL_PSS_LOWERED_INTERVAL); 273 POWER_CHECK_DELAY = mParser.getLong(KEY_POWER_CHECK_DELAY, 274 DEFAULT_POWER_CHECK_DELAY); 275 WAKE_LOCK_MIN_CHECK_DURATION = mParser.getLong(KEY_WAKE_LOCK_MIN_CHECK_DURATION, 276 DEFAULT_WAKE_LOCK_MIN_CHECK_DURATION); 277 CPU_MIN_CHECK_DURATION = mParser.getLong(KEY_CPU_MIN_CHECK_DURATION, 278 DEFAULT_CPU_MIN_CHECK_DURATION); 279 SERVICE_USAGE_INTERACTION_TIME = mParser.getLong(KEY_SERVICE_USAGE_INTERACTION_TIME, 280 DEFAULT_SERVICE_USAGE_INTERACTION_TIME); 281 USAGE_STATS_INTERACTION_INTERVAL = mParser.getLong(KEY_USAGE_STATS_INTERACTION_INTERVAL, 282 DEFAULT_USAGE_STATS_INTERACTION_INTERVAL); 283 SERVICE_RESTART_DURATION = mParser.getLong(KEY_SERVICE_RESTART_DURATION, 284 DEFAULT_SERVICE_RESTART_DURATION); 285 SERVICE_RESET_RUN_DURATION = mParser.getLong(KEY_SERVICE_RESET_RUN_DURATION, 286 DEFAULT_SERVICE_RESET_RUN_DURATION); 287 SERVICE_RESTART_DURATION_FACTOR = mParser.getInt(KEY_SERVICE_RESTART_DURATION_FACTOR, 288 DEFAULT_SERVICE_RESTART_DURATION_FACTOR); 289 SERVICE_MIN_RESTART_TIME_BETWEEN = mParser.getLong(KEY_SERVICE_MIN_RESTART_TIME_BETWEEN, 290 DEFAULT_SERVICE_MIN_RESTART_TIME_BETWEEN); 291 MAX_SERVICE_INACTIVITY = mParser.getLong(KEY_MAX_SERVICE_INACTIVITY, 292 DEFAULT_MAX_SERVICE_INACTIVITY); 293 BG_START_TIMEOUT = mParser.getLong(KEY_BG_START_TIMEOUT, 294 DEFAULT_BG_START_TIMEOUT); 295 updateMaxCachedProcesses(); 296 } 297 } 298 299 private void updateMaxCachedProcesses() { 300 CUR_MAX_CACHED_PROCESSES = mOverrideMaxCachedProcesses < 0 301 ? MAX_CACHED_PROCESSES : mOverrideMaxCachedProcesses; 302 CUR_MAX_EMPTY_PROCESSES = computeEmptyProcessLimit(CUR_MAX_CACHED_PROCESSES); 303 304 // Note the trim levels do NOT depend on the override process limit, we want 305 // to consider the same level the point where we do trimming regardless of any 306 // additional enforced limit. 307 final int rawMaxEmptyProcesses = computeEmptyProcessLimit(MAX_CACHED_PROCESSES); 308 CUR_TRIM_EMPTY_PROCESSES = rawMaxEmptyProcesses/2; 309 CUR_TRIM_CACHED_PROCESSES = (MAX_CACHED_PROCESSES-rawMaxEmptyProcesses)/3; 310 } 311 312 void dump(PrintWriter pw) { 313 pw.println("ACTIVITY MANAGER SETTINGS (dumpsys activity settings) " 314 + Settings.Global.ACTIVITY_MANAGER_CONSTANTS + ":"); 315 316 pw.print(" "); pw.print(KEY_MAX_CACHED_PROCESSES); pw.print("="); 317 pw.println(MAX_CACHED_PROCESSES); 318 pw.print(" "); pw.print(KEY_BACKGROUND_SETTLE_TIME); pw.print("="); 319 pw.println(BACKGROUND_SETTLE_TIME); 320 pw.print(" "); pw.print(KEY_FGSERVICE_MIN_SHOWN_TIME); pw.print("="); 321 pw.println(FGSERVICE_MIN_SHOWN_TIME); 322 pw.print(" "); pw.print(KEY_FGSERVICE_MIN_REPORT_TIME); pw.print("="); 323 pw.println(FGSERVICE_MIN_REPORT_TIME); 324 pw.print(" "); pw.print(KEY_FGSERVICE_SCREEN_ON_BEFORE_TIME); pw.print("="); 325 pw.println(FGSERVICE_SCREEN_ON_BEFORE_TIME); 326 pw.print(" "); pw.print(KEY_FGSERVICE_SCREEN_ON_AFTER_TIME); pw.print("="); 327 pw.println(FGSERVICE_SCREEN_ON_AFTER_TIME); 328 pw.print(" "); pw.print(KEY_CONTENT_PROVIDER_RETAIN_TIME); pw.print("="); 329 pw.println(CONTENT_PROVIDER_RETAIN_TIME); 330 pw.print(" "); pw.print(KEY_GC_TIMEOUT); pw.print("="); 331 pw.println(GC_TIMEOUT); 332 pw.print(" "); pw.print(KEY_GC_MIN_INTERVAL); pw.print("="); 333 pw.println(GC_MIN_INTERVAL); 334 pw.print(" "); pw.print(KEY_FULL_PSS_MIN_INTERVAL); pw.print("="); 335 pw.println(FULL_PSS_MIN_INTERVAL); 336 pw.print(" "); pw.print(KEY_FULL_PSS_LOWERED_INTERVAL); pw.print("="); 337 pw.println(FULL_PSS_LOWERED_INTERVAL); 338 pw.print(" "); pw.print(KEY_POWER_CHECK_DELAY); pw.print("="); 339 pw.println(POWER_CHECK_DELAY); 340 pw.print(" "); pw.print(KEY_WAKE_LOCK_MIN_CHECK_DURATION); pw.print("="); 341 pw.println(WAKE_LOCK_MIN_CHECK_DURATION); 342 pw.print(" "); pw.print(KEY_CPU_MIN_CHECK_DURATION); pw.print("="); 343 pw.println(CPU_MIN_CHECK_DURATION); 344 pw.print(" "); pw.print(KEY_SERVICE_USAGE_INTERACTION_TIME); pw.print("="); 345 pw.println(SERVICE_USAGE_INTERACTION_TIME); 346 pw.print(" "); pw.print(KEY_USAGE_STATS_INTERACTION_INTERVAL); pw.print("="); 347 pw.println(USAGE_STATS_INTERACTION_INTERVAL); 348 pw.print(" "); pw.print(KEY_SERVICE_RESTART_DURATION); pw.print("="); 349 pw.println(SERVICE_RESTART_DURATION); 350 pw.print(" "); pw.print(KEY_SERVICE_RESET_RUN_DURATION); pw.print("="); 351 pw.println(SERVICE_RESET_RUN_DURATION); 352 pw.print(" "); pw.print(KEY_SERVICE_RESTART_DURATION_FACTOR); pw.print("="); 353 pw.println(SERVICE_RESTART_DURATION_FACTOR); 354 pw.print(" "); pw.print(KEY_SERVICE_MIN_RESTART_TIME_BETWEEN); pw.print("="); 355 pw.println(SERVICE_MIN_RESTART_TIME_BETWEEN); 356 pw.print(" "); pw.print(KEY_MAX_SERVICE_INACTIVITY); pw.print("="); 357 pw.println(MAX_SERVICE_INACTIVITY); 358 pw.print(" "); pw.print(KEY_BG_START_TIMEOUT); pw.print("="); 359 pw.println(BG_START_TIMEOUT); 360 361 pw.println(); 362 if (mOverrideMaxCachedProcesses >= 0) { 363 pw.print(" mOverrideMaxCachedProcesses="); pw.println(mOverrideMaxCachedProcesses); 364 } 365 pw.print(" CUR_MAX_CACHED_PROCESSES="); pw.println(CUR_MAX_CACHED_PROCESSES); 366 pw.print(" CUR_MAX_EMPTY_PROCESSES="); pw.println(CUR_MAX_EMPTY_PROCESSES); 367 pw.print(" CUR_TRIM_EMPTY_PROCESSES="); pw.println(CUR_TRIM_EMPTY_PROCESSES); 368 pw.print(" CUR_TRIM_CACHED_PROCESSES="); pw.println(CUR_TRIM_CACHED_PROCESSES); 369 } 370} 371