1/* 2 * Copyright (C) 2011 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 static com.android.server.am.ActivityManagerDebugConfig.TAG_AM; 20import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME; 21 22import java.io.IOException; 23import java.io.OutputStream; 24import java.nio.ByteBuffer; 25 26import android.app.ActivityManager; 27import android.os.Build; 28import android.os.SystemClock; 29import com.android.internal.util.MemInfoReader; 30import com.android.server.wm.WindowManagerService; 31 32import android.content.res.Resources; 33import android.graphics.Point; 34import android.os.SystemProperties; 35import android.net.LocalSocketAddress; 36import android.net.LocalSocket; 37import android.util.Slog; 38import android.view.Display; 39 40/** 41 * Activity manager code dealing with processes. 42 */ 43final class ProcessList { 44 private static final String TAG = TAG_WITH_CLASS_NAME ? "ProcessList" : TAG_AM; 45 46 // The minimum time we allow between crashes, for us to consider this 47 // application to be bad and stop and its services and reject broadcasts. 48 static final int MIN_CRASH_INTERVAL = 60*1000; 49 50 // OOM adjustments for processes in various states: 51 52 // Uninitialized value for any major or minor adj fields 53 static final int INVALID_ADJ = -10000; 54 55 // Adjustment used in certain places where we don't know it yet. 56 // (Generally this is something that is going to be cached, but we 57 // don't know the exact value in the cached range to assign yet.) 58 static final int UNKNOWN_ADJ = 1001; 59 60 // This is a process only hosting activities that are not visible, 61 // so it can be killed without any disruption. 62 static final int CACHED_APP_MAX_ADJ = 906; 63 static final int CACHED_APP_MIN_ADJ = 900; 64 65 // The B list of SERVICE_ADJ -- these are the old and decrepit 66 // services that aren't as shiny and interesting as the ones in the A list. 67 static final int SERVICE_B_ADJ = 800; 68 69 // This is the process of the previous application that the user was in. 70 // This process is kept above other things, because it is very common to 71 // switch back to the previous app. This is important both for recent 72 // task switch (toggling between the two top recent apps) as well as normal 73 // UI flow such as clicking on a URI in the e-mail app to view in the browser, 74 // and then pressing back to return to e-mail. 75 static final int PREVIOUS_APP_ADJ = 700; 76 77 // This is a process holding the home application -- we want to try 78 // avoiding killing it, even if it would normally be in the background, 79 // because the user interacts with it so much. 80 static final int HOME_APP_ADJ = 600; 81 82 // This is a process holding an application service -- killing it will not 83 // have much of an impact as far as the user is concerned. 84 static final int SERVICE_ADJ = 500; 85 86 // This is a process with a heavy-weight application. It is in the 87 // background, but we want to try to avoid killing it. Value set in 88 // system/rootdir/init.rc on startup. 89 static final int HEAVY_WEIGHT_APP_ADJ = 400; 90 91 // This is a process currently hosting a backup operation. Killing it 92 // is not entirely fatal but is generally a bad idea. 93 static final int BACKUP_APP_ADJ = 300; 94 95 // This is a process only hosting components that are perceptible to the 96 // user, and we really want to avoid killing them, but they are not 97 // immediately visible. An example is background music playback. 98 static final int PERCEPTIBLE_APP_ADJ = 200; 99 100 // This is a process only hosting activities that are visible to the 101 // user, so we'd prefer they don't disappear. 102 static final int VISIBLE_APP_ADJ = 100; 103 static final int VISIBLE_APP_LAYER_MAX = PERCEPTIBLE_APP_ADJ - VISIBLE_APP_ADJ - 1; 104 105 // This is the process running the current foreground app. We'd really 106 // rather not kill it! 107 static final int FOREGROUND_APP_ADJ = 0; 108 109 // This is a process that the system or a persistent process has bound to, 110 // and indicated it is important. 111 static final int PERSISTENT_SERVICE_ADJ = -700; 112 113 // This is a system persistent process, such as telephony. Definitely 114 // don't want to kill it, but doing so is not completely fatal. 115 static final int PERSISTENT_PROC_ADJ = -800; 116 117 // The system process runs at the default adjustment. 118 static final int SYSTEM_ADJ = -900; 119 120 // Special code for native processes that are not being managed by the system (so 121 // don't have an oom adj assigned by the system). 122 static final int NATIVE_ADJ = -1000; 123 124 // Memory pages are 4K. 125 static final int PAGE_SIZE = 4*1024; 126 127 // Activity manager's version of Process.THREAD_GROUP_BG_NONINTERACTIVE 128 static final int SCHED_GROUP_BACKGROUND = 0; 129 // Activity manager's version of Process.THREAD_GROUP_DEFAULT 130 static final int SCHED_GROUP_DEFAULT = 1; 131 // Activity manager's version of Process.THREAD_GROUP_TOP_APP 132 static final int SCHED_GROUP_TOP_APP = 2; 133 // Activity manager's version of Process.THREAD_GROUP_TOP_APP 134 // Disambiguate between actual top app and processes bound to the top app 135 static final int SCHED_GROUP_TOP_APP_BOUND = 3; 136 137 // The minimum number of cached apps we want to be able to keep around, 138 // without empty apps being able to push them out of memory. 139 static final int MIN_CACHED_APPS = 2; 140 141 // We allow empty processes to stick around for at most 30 minutes. 142 static final long MAX_EMPTY_TIME = 30*60*1000; 143 144 // Threshold of number of cached+empty where we consider memory critical. 145 static final int TRIM_CRITICAL_THRESHOLD = 3; 146 147 // Threshold of number of cached+empty where we consider memory critical. 148 static final int TRIM_LOW_THRESHOLD = 5; 149 150 // Low Memory Killer Daemon command codes. 151 // These must be kept in sync with the definitions in lmkd.c 152 // 153 // LMK_TARGET <minfree> <minkillprio> ... (up to 6 pairs) 154 // LMK_PROCPRIO <pid> <uid> <prio> 155 // LMK_PROCREMOVE <pid> 156 static final byte LMK_TARGET = 0; 157 static final byte LMK_PROCPRIO = 1; 158 static final byte LMK_PROCREMOVE = 2; 159 160 // These are the various interesting memory levels that we will give to 161 // the OOM killer. Note that the OOM killer only supports 6 slots, so we 162 // can't give it a different value for every possible kind of process. 163 private final int[] mOomAdj = new int[] { 164 FOREGROUND_APP_ADJ, VISIBLE_APP_ADJ, PERCEPTIBLE_APP_ADJ, 165 BACKUP_APP_ADJ, CACHED_APP_MIN_ADJ, CACHED_APP_MAX_ADJ 166 }; 167 // These are the low-end OOM level limits. This is appropriate for an 168 // HVGA or smaller phone with less than 512MB. Values are in KB. 169 private final int[] mOomMinFreeLow = new int[] { 170 12288, 18432, 24576, 171 36864, 43008, 49152 172 }; 173 // These are the high-end OOM level limits. This is appropriate for a 174 // 1280x800 or larger screen with around 1GB RAM. Values are in KB. 175 private final int[] mOomMinFreeHigh = new int[] { 176 73728, 92160, 110592, 177 129024, 147456, 184320 178 }; 179 // The actual OOM killer memory levels we are using. 180 private final int[] mOomMinFree = new int[mOomAdj.length]; 181 182 private final long mTotalMemMb; 183 184 private long mCachedRestoreLevel; 185 186 private boolean mHaveDisplaySize; 187 188 private static LocalSocket sLmkdSocket; 189 private static OutputStream sLmkdOutputStream; 190 191 ProcessList() { 192 MemInfoReader minfo = new MemInfoReader(); 193 minfo.readMemInfo(); 194 mTotalMemMb = minfo.getTotalSize()/(1024*1024); 195 updateOomLevels(0, 0, false); 196 } 197 198 void applyDisplaySize(WindowManagerService wm) { 199 if (!mHaveDisplaySize) { 200 Point p = new Point(); 201 // TODO(multi-display): Compute based on sum of all connected displays' resolutions. 202 wm.getBaseDisplaySize(Display.DEFAULT_DISPLAY, p); 203 if (p.x != 0 && p.y != 0) { 204 updateOomLevels(p.x, p.y, true); 205 mHaveDisplaySize = true; 206 } 207 } 208 } 209 210 private void updateOomLevels(int displayWidth, int displayHeight, boolean write) { 211 // Scale buckets from avail memory: at 300MB we use the lowest values to 212 // 700MB or more for the top values. 213 float scaleMem = ((float)(mTotalMemMb-350))/(700-350); 214 215 // Scale buckets from screen size. 216 int minSize = 480*800; // 384000 217 int maxSize = 1280*800; // 1024000 230400 870400 .264 218 float scaleDisp = ((float)(displayWidth*displayHeight)-minSize)/(maxSize-minSize); 219 if (false) { 220 Slog.i("XXXXXX", "scaleMem=" + scaleMem); 221 Slog.i("XXXXXX", "scaleDisp=" + scaleDisp + " dw=" + displayWidth 222 + " dh=" + displayHeight); 223 } 224 225 float scale = scaleMem > scaleDisp ? scaleMem : scaleDisp; 226 if (scale < 0) scale = 0; 227 else if (scale > 1) scale = 1; 228 int minfree_adj = Resources.getSystem().getInteger( 229 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAdjust); 230 int minfree_abs = Resources.getSystem().getInteger( 231 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAbsolute); 232 if (false) { 233 Slog.i("XXXXXX", "minfree_adj=" + minfree_adj + " minfree_abs=" + minfree_abs); 234 } 235 236 final boolean is64bit = Build.SUPPORTED_64_BIT_ABIS.length > 0; 237 238 for (int i=0; i<mOomAdj.length; i++) { 239 int low = mOomMinFreeLow[i]; 240 int high = mOomMinFreeHigh[i]; 241 if (is64bit) { 242 // Increase the high min-free levels for cached processes for 64-bit 243 if (i == 4) high = (high*3)/2; 244 else if (i == 5) high = (high*7)/4; 245 } 246 mOomMinFree[i] = (int)(low + ((high-low)*scale)); 247 } 248 249 if (minfree_abs >= 0) { 250 for (int i=0; i<mOomAdj.length; i++) { 251 mOomMinFree[i] = (int)((float)minfree_abs * mOomMinFree[i] 252 / mOomMinFree[mOomAdj.length - 1]); 253 } 254 } 255 256 if (minfree_adj != 0) { 257 for (int i=0; i<mOomAdj.length; i++) { 258 mOomMinFree[i] += (int)((float)minfree_adj * mOomMinFree[i] 259 / mOomMinFree[mOomAdj.length - 1]); 260 if (mOomMinFree[i] < 0) { 261 mOomMinFree[i] = 0; 262 } 263 } 264 } 265 266 // The maximum size we will restore a process from cached to background, when under 267 // memory duress, is 1/3 the size we have reserved for kernel caches and other overhead 268 // before killing background processes. 269 mCachedRestoreLevel = (getMemLevel(ProcessList.CACHED_APP_MAX_ADJ)/1024) / 3; 270 271 // Ask the kernel to try to keep enough memory free to allocate 3 full 272 // screen 32bpp buffers without entering direct reclaim. 273 int reserve = displayWidth * displayHeight * 4 * 3 / 1024; 274 int reserve_adj = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAdjust); 275 int reserve_abs = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAbsolute); 276 277 if (reserve_abs >= 0) { 278 reserve = reserve_abs; 279 } 280 281 if (reserve_adj != 0) { 282 reserve += reserve_adj; 283 if (reserve < 0) { 284 reserve = 0; 285 } 286 } 287 288 if (write) { 289 ByteBuffer buf = ByteBuffer.allocate(4 * (2*mOomAdj.length + 1)); 290 buf.putInt(LMK_TARGET); 291 for (int i=0; i<mOomAdj.length; i++) { 292 buf.putInt((mOomMinFree[i]*1024)/PAGE_SIZE); 293 buf.putInt(mOomAdj[i]); 294 } 295 296 writeLmkd(buf); 297 SystemProperties.set("sys.sysctl.extra_free_kbytes", Integer.toString(reserve)); 298 } 299 // GB: 2048,3072,4096,6144,7168,8192 300 // HC: 8192,10240,12288,14336,16384,20480 301 } 302 303 public static int computeEmptyProcessLimit(int totalProcessLimit) { 304 return totalProcessLimit/2; 305 } 306 307 private static String buildOomTag(String prefix, String space, int val, int base) { 308 if (val == base) { 309 if (space == null) return prefix; 310 return prefix + " "; 311 } 312 return prefix + "+" + Integer.toString(val-base); 313 } 314 315 public static String makeOomAdjString(int setAdj) { 316 if (setAdj >= ProcessList.CACHED_APP_MIN_ADJ) { 317 return buildOomTag("cch", " ", setAdj, ProcessList.CACHED_APP_MIN_ADJ); 318 } else if (setAdj >= ProcessList.SERVICE_B_ADJ) { 319 return buildOomTag("svcb ", null, setAdj, ProcessList.SERVICE_B_ADJ); 320 } else if (setAdj >= ProcessList.PREVIOUS_APP_ADJ) { 321 return buildOomTag("prev ", null, setAdj, ProcessList.PREVIOUS_APP_ADJ); 322 } else if (setAdj >= ProcessList.HOME_APP_ADJ) { 323 return buildOomTag("home ", null, setAdj, ProcessList.HOME_APP_ADJ); 324 } else if (setAdj >= ProcessList.SERVICE_ADJ) { 325 return buildOomTag("svc ", null, setAdj, ProcessList.SERVICE_ADJ); 326 } else if (setAdj >= ProcessList.HEAVY_WEIGHT_APP_ADJ) { 327 return buildOomTag("hvy ", null, setAdj, ProcessList.HEAVY_WEIGHT_APP_ADJ); 328 } else if (setAdj >= ProcessList.BACKUP_APP_ADJ) { 329 return buildOomTag("bkup ", null, setAdj, ProcessList.BACKUP_APP_ADJ); 330 } else if (setAdj >= ProcessList.PERCEPTIBLE_APP_ADJ) { 331 return buildOomTag("prcp ", null, setAdj, ProcessList.PERCEPTIBLE_APP_ADJ); 332 } else if (setAdj >= ProcessList.VISIBLE_APP_ADJ) { 333 return buildOomTag("vis ", null, setAdj, ProcessList.VISIBLE_APP_ADJ); 334 } else if (setAdj >= ProcessList.FOREGROUND_APP_ADJ) { 335 return buildOomTag("fore ", null, setAdj, ProcessList.FOREGROUND_APP_ADJ); 336 } else if (setAdj >= ProcessList.PERSISTENT_SERVICE_ADJ) { 337 return buildOomTag("psvc ", null, setAdj, ProcessList.PERSISTENT_SERVICE_ADJ); 338 } else if (setAdj >= ProcessList.PERSISTENT_PROC_ADJ) { 339 return buildOomTag("pers ", null, setAdj, ProcessList.PERSISTENT_PROC_ADJ); 340 } else if (setAdj >= ProcessList.SYSTEM_ADJ) { 341 return buildOomTag("sys ", null, setAdj, ProcessList.SYSTEM_ADJ); 342 } else if (setAdj >= ProcessList.NATIVE_ADJ) { 343 return buildOomTag("ntv ", null, setAdj, ProcessList.NATIVE_ADJ); 344 } else { 345 return Integer.toString(setAdj); 346 } 347 } 348 349 public static String makeProcStateString(int curProcState) { 350 String procState; 351 switch (curProcState) { 352 case ActivityManager.PROCESS_STATE_PERSISTENT: 353 procState = "PER "; 354 break; 355 case ActivityManager.PROCESS_STATE_PERSISTENT_UI: 356 procState = "PERU"; 357 break; 358 case ActivityManager.PROCESS_STATE_TOP: 359 procState = "TOP "; 360 break; 361 case ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE: 362 procState = "BFGS"; 363 break; 364 case ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE: 365 procState = "FGS "; 366 break; 367 case ActivityManager.PROCESS_STATE_TOP_SLEEPING: 368 procState = "TPSL"; 369 break; 370 case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND: 371 procState = "IMPF"; 372 break; 373 case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND: 374 procState = "IMPB"; 375 break; 376 case ActivityManager.PROCESS_STATE_TRANSIENT_BACKGROUND: 377 procState = "TRNB"; 378 break; 379 case ActivityManager.PROCESS_STATE_BACKUP: 380 procState = "BKUP"; 381 break; 382 case ActivityManager.PROCESS_STATE_HEAVY_WEIGHT: 383 procState = "HVY "; 384 break; 385 case ActivityManager.PROCESS_STATE_SERVICE: 386 procState = "SVC "; 387 break; 388 case ActivityManager.PROCESS_STATE_RECEIVER: 389 procState = "RCVR"; 390 break; 391 case ActivityManager.PROCESS_STATE_HOME: 392 procState = "HOME"; 393 break; 394 case ActivityManager.PROCESS_STATE_LAST_ACTIVITY: 395 procState = "LAST"; 396 break; 397 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY: 398 procState = "CAC "; 399 break; 400 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT: 401 procState = "CACC"; 402 break; 403 case ActivityManager.PROCESS_STATE_CACHED_EMPTY: 404 procState = "CEM "; 405 break; 406 case ActivityManager.PROCESS_STATE_NONEXISTENT: 407 procState = "NONE"; 408 break; 409 default: 410 procState = "??"; 411 break; 412 } 413 return procState; 414 } 415 416 public static void appendRamKb(StringBuilder sb, long ramKb) { 417 for (int j=0, fact=10; j<6; j++, fact*=10) { 418 if (ramKb < fact) { 419 sb.append(' '); 420 } 421 } 422 sb.append(ramKb); 423 } 424 425 // How long after a state change that it is safe to collect PSS without it being dirty. 426 public static final int PSS_SAFE_TIME_FROM_STATE_CHANGE = 1000; 427 428 // The minimum time interval after a state change it is safe to collect PSS. 429 public static final int PSS_MIN_TIME_FROM_STATE_CHANGE = 15*1000; 430 431 // The maximum amount of time we want to go between PSS collections. 432 public static final int PSS_MAX_INTERVAL = 30*60*1000; 433 434 // The minimum amount of time between successive PSS requests for *all* processes. 435 public static final int PSS_ALL_INTERVAL = 10*60*1000; 436 437 // The minimum amount of time between successive PSS requests for a process. 438 private static final int PSS_SHORT_INTERVAL = 2*60*1000; 439 440 // The amount of time until PSS when a process first becomes top. 441 private static final int PSS_FIRST_TOP_INTERVAL = 10*1000; 442 443 // The amount of time until PSS when a process first goes into the background. 444 private static final int PSS_FIRST_BACKGROUND_INTERVAL = 20*1000; 445 446 // The amount of time until PSS when a process first becomes cached. 447 private static final int PSS_FIRST_CACHED_INTERVAL = 30*1000; 448 449 // The amount of time until PSS when an important process stays in the same state. 450 private static final int PSS_SAME_IMPORTANT_INTERVAL = 15*60*1000; 451 452 // The amount of time until PSS when a service process stays in the same state. 453 private static final int PSS_SAME_SERVICE_INTERVAL = 20*60*1000; 454 455 // The amount of time until PSS when a cached process stays in the same state. 456 private static final int PSS_SAME_CACHED_INTERVAL = 30*60*1000; 457 458 // The minimum time interval after a state change it is safe to collect PSS. 459 public static final int PSS_TEST_MIN_TIME_FROM_STATE_CHANGE = 10*1000; 460 461 // The amount of time during testing until PSS when a process first becomes top. 462 private static final int PSS_TEST_FIRST_TOP_INTERVAL = 3*1000; 463 464 // The amount of time during testing until PSS when a process first goes into the background. 465 private static final int PSS_TEST_FIRST_BACKGROUND_INTERVAL = 5*1000; 466 467 // The amount of time during testing until PSS when an important process stays in same state. 468 private static final int PSS_TEST_SAME_IMPORTANT_INTERVAL = 10*1000; 469 470 // The amount of time during testing until PSS when a background process stays in same state. 471 private static final int PSS_TEST_SAME_BACKGROUND_INTERVAL = 15*1000; 472 473 public static final int PROC_MEM_PERSISTENT = 0; 474 public static final int PROC_MEM_TOP = 1; 475 public static final int PROC_MEM_IMPORTANT = 2; 476 public static final int PROC_MEM_SERVICE = 3; 477 public static final int PROC_MEM_CACHED = 4; 478 479 private static final int[] sProcStateToProcMem = new int[] { 480 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT 481 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 482 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP 483 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 484 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 485 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 486 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 487 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 488 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_TRANSIENT_BACKGROUND 489 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BACKUP 490 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 491 PROC_MEM_SERVICE, // ActivityManager.PROCESS_STATE_SERVICE 492 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_RECEIVER 493 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_HOME 494 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 495 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 496 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 497 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 498 }; 499 500 private static final long[] sFirstAwakePssTimes = new long[] { 501 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 502 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 503 PSS_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 504 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 505 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 506 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 507 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 508 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 509 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_TRANSIENT_BACKGROUND 510 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 511 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 512 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 513 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 514 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 515 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 516 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 517 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 518 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 519 }; 520 521 private static final long[] sSameAwakePssTimes = new long[] { 522 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 523 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 524 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 525 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 526 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 527 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 528 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 529 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 530 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TRANSIENT_BACKGROUND 531 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 532 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 533 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 534 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 535 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 536 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 537 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 538 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 539 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 540 }; 541 542 private static final long[] sTestFirstAwakePssTimes = new long[] { 543 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 544 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 545 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 546 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 547 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 548 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 549 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 550 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 551 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_TRANSIENT_BACKGROUND 552 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 553 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 554 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 555 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 556 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 557 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 558 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 559 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 560 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 561 }; 562 563 private static final long[] sTestSameAwakePssTimes = new long[] { 564 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 565 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 566 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 567 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 568 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 569 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 570 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 571 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 572 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TRANSIENT_BACKGROUND 573 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 574 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 575 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 576 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 577 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 578 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 579 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 580 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 581 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 582 }; 583 584 public static boolean procStatesDifferForMem(int procState1, int procState2) { 585 return sProcStateToProcMem[procState1] != sProcStateToProcMem[procState2]; 586 } 587 588 public static long minTimeFromStateChange(boolean test) { 589 return test ? PSS_TEST_MIN_TIME_FROM_STATE_CHANGE : PSS_MIN_TIME_FROM_STATE_CHANGE; 590 } 591 592 public static long computeNextPssTime(int procState, boolean first, boolean test, 593 boolean sleeping, long now) { 594 final long[] table = test 595 ? (first 596 ? sTestFirstAwakePssTimes 597 : sTestSameAwakePssTimes) 598 : (first 599 ? sFirstAwakePssTimes 600 : sSameAwakePssTimes); 601 return now + table[procState]; 602 } 603 604 long getMemLevel(int adjustment) { 605 for (int i=0; i<mOomAdj.length; i++) { 606 if (adjustment <= mOomAdj[i]) { 607 return mOomMinFree[i] * 1024; 608 } 609 } 610 return mOomMinFree[mOomAdj.length-1] * 1024; 611 } 612 613 /** 614 * Return the maximum pss size in kb that we consider a process acceptable to 615 * restore from its cached state for running in the background when RAM is low. 616 */ 617 long getCachedRestoreThresholdKb() { 618 return mCachedRestoreLevel; 619 } 620 621 /** 622 * Set the out-of-memory badness adjustment for a process. 623 * 624 * @param pid The process identifier to set. 625 * @param uid The uid of the app 626 * @param amt Adjustment value -- lmkd allows -16 to +15. 627 * 628 * {@hide} 629 */ 630 public static final void setOomAdj(int pid, int uid, int amt) { 631 if (amt == UNKNOWN_ADJ) 632 return; 633 634 long start = SystemClock.elapsedRealtime(); 635 ByteBuffer buf = ByteBuffer.allocate(4 * 4); 636 buf.putInt(LMK_PROCPRIO); 637 buf.putInt(pid); 638 buf.putInt(uid); 639 buf.putInt(amt); 640 writeLmkd(buf); 641 long now = SystemClock.elapsedRealtime(); 642 if ((now-start) > 250) { 643 Slog.w("ActivityManager", "SLOW OOM ADJ: " + (now-start) + "ms for pid " + pid 644 + " = " + amt); 645 } 646 } 647 648 /* 649 * {@hide} 650 */ 651 public static final void remove(int pid) { 652 ByteBuffer buf = ByteBuffer.allocate(4 * 2); 653 buf.putInt(LMK_PROCREMOVE); 654 buf.putInt(pid); 655 writeLmkd(buf); 656 } 657 658 private static boolean openLmkdSocket() { 659 try { 660 sLmkdSocket = new LocalSocket(LocalSocket.SOCKET_SEQPACKET); 661 sLmkdSocket.connect( 662 new LocalSocketAddress("lmkd", 663 LocalSocketAddress.Namespace.RESERVED)); 664 sLmkdOutputStream = sLmkdSocket.getOutputStream(); 665 } catch (IOException ex) { 666 Slog.w(TAG, "lowmemorykiller daemon socket open failed"); 667 sLmkdSocket = null; 668 return false; 669 } 670 671 return true; 672 } 673 674 private static void writeLmkd(ByteBuffer buf) { 675 676 for (int i = 0; i < 3; i++) { 677 if (sLmkdSocket == null) { 678 if (openLmkdSocket() == false) { 679 try { 680 Thread.sleep(1000); 681 } catch (InterruptedException ie) { 682 } 683 continue; 684 } 685 } 686 687 try { 688 sLmkdOutputStream.write(buf.array(), 0, buf.position()); 689 return; 690 } catch (IOException ex) { 691 Slog.w(TAG, "Error writing to lowmemorykiller socket"); 692 693 try { 694 sLmkdSocket.close(); 695 } catch (IOException ex2) { 696 } 697 698 sLmkdSocket = null; 699 } 700 } 701 } 702} 703