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 17 package com.android.server.am; 18 19 import static com.android.server.am.ActivityManagerDebugConfig.TAG_AM; 20 import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME; 21 22 import java.io.IOException; 23 import java.io.OutputStream; 24 import java.nio.ByteBuffer; 25 26 import android.app.ActivityManager; 27 import android.os.Build; 28 import android.os.SystemClock; 29 import com.android.internal.util.MemInfoReader; 30 import com.android.server.wm.WindowManagerService; 31 32 import android.content.res.Resources; 33 import android.graphics.Point; 34 import android.os.SystemProperties; 35 import android.net.LocalSocketAddress; 36 import android.net.LocalSocket; 37 import android.util.Slog; 38 import android.view.Display; 39 40 /** 41 * Activity manager code dealing with processes. 42 */ 43 final 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 // The maximum number of cached processes we will keep around before killing them. 142 // NOTE: this constant is *only* a control to not let us go too crazy with 143 // keeping around processes on devices with large amounts of RAM. For devices that 144 // are tighter on RAM, the out of memory killer is responsible for killing background 145 // processes as RAM is needed, and we should *never* be relying on this limit to 146 // kill them. Also note that this limit only applies to cached background processes; 147 // we have no limit on the number of service, visible, foreground, or other such 148 // processes and the number of those processes does not count against the cached 149 // process limit. 150 static final int MAX_CACHED_APPS = 32; 151 152 // We allow empty processes to stick around for at most 30 minutes. 153 static final long MAX_EMPTY_TIME = 30*60*1000; 154 155 // The maximum number of empty app processes we will let sit around. 156 private static final int MAX_EMPTY_APPS = computeEmptyProcessLimit(MAX_CACHED_APPS); 157 158 // The number of empty apps at which we don't consider it necessary to do 159 // memory trimming. 160 static final int TRIM_EMPTY_APPS = MAX_EMPTY_APPS/2; 161 162 // The number of cached at which we don't consider it necessary to do 163 // memory trimming. 164 static final int TRIM_CACHED_APPS = (MAX_CACHED_APPS-MAX_EMPTY_APPS)/3; 165 166 // Threshold of number of cached+empty where we consider memory critical. 167 static final int TRIM_CRITICAL_THRESHOLD = 3; 168 169 // Threshold of number of cached+empty where we consider memory critical. 170 static final int TRIM_LOW_THRESHOLD = 5; 171 172 // Low Memory Killer Daemon command codes. 173 // These must be kept in sync with the definitions in lmkd.c 174 // 175 // LMK_TARGET <minfree> <minkillprio> ... (up to 6 pairs) 176 // LMK_PROCPRIO <pid> <uid> <prio> 177 // LMK_PROCREMOVE <pid> 178 static final byte LMK_TARGET = 0; 179 static final byte LMK_PROCPRIO = 1; 180 static final byte LMK_PROCREMOVE = 2; 181 182 // These are the various interesting memory levels that we will give to 183 // the OOM killer. Note that the OOM killer only supports 6 slots, so we 184 // can't give it a different value for every possible kind of process. 185 private final int[] mOomAdj = new int[] { 186 FOREGROUND_APP_ADJ, VISIBLE_APP_ADJ, PERCEPTIBLE_APP_ADJ, 187 BACKUP_APP_ADJ, CACHED_APP_MIN_ADJ, CACHED_APP_MAX_ADJ 188 }; 189 // These are the low-end OOM level limits. This is appropriate for an 190 // HVGA or smaller phone with less than 512MB. Values are in KB. 191 private final int[] mOomMinFreeLow = new int[] { 192 12288, 18432, 24576, 193 36864, 43008, 49152 194 }; 195 // These are the high-end OOM level limits. This is appropriate for a 196 // 1280x800 or larger screen with around 1GB RAM. Values are in KB. 197 private final int[] mOomMinFreeHigh = new int[] { 198 73728, 92160, 110592, 199 129024, 147456, 184320 200 }; 201 // The actual OOM killer memory levels we are using. 202 private final int[] mOomMinFree = new int[mOomAdj.length]; 203 204 private final long mTotalMemMb; 205 206 private long mCachedRestoreLevel; 207 208 private boolean mHaveDisplaySize; 209 210 private static LocalSocket sLmkdSocket; 211 private static OutputStream sLmkdOutputStream; 212 ProcessList()213 ProcessList() { 214 MemInfoReader minfo = new MemInfoReader(); 215 minfo.readMemInfo(); 216 mTotalMemMb = minfo.getTotalSize()/(1024*1024); 217 updateOomLevels(0, 0, false); 218 } 219 applyDisplaySize(WindowManagerService wm)220 void applyDisplaySize(WindowManagerService wm) { 221 if (!mHaveDisplaySize) { 222 Point p = new Point(); 223 wm.getBaseDisplaySize(Display.DEFAULT_DISPLAY, p); 224 if (p.x != 0 && p.y != 0) { 225 updateOomLevels(p.x, p.y, true); 226 mHaveDisplaySize = true; 227 } 228 } 229 } 230 updateOomLevels(int displayWidth, int displayHeight, boolean write)231 private void updateOomLevels(int displayWidth, int displayHeight, boolean write) { 232 // Scale buckets from avail memory: at 300MB we use the lowest values to 233 // 700MB or more for the top values. 234 float scaleMem = ((float)(mTotalMemMb-350))/(700-350); 235 236 // Scale buckets from screen size. 237 int minSize = 480*800; // 384000 238 int maxSize = 1280*800; // 1024000 230400 870400 .264 239 float scaleDisp = ((float)(displayWidth*displayHeight)-minSize)/(maxSize-minSize); 240 if (false) { 241 Slog.i("XXXXXX", "scaleMem=" + scaleMem); 242 Slog.i("XXXXXX", "scaleDisp=" + scaleDisp + " dw=" + displayWidth 243 + " dh=" + displayHeight); 244 } 245 246 float scale = scaleMem > scaleDisp ? scaleMem : scaleDisp; 247 if (scale < 0) scale = 0; 248 else if (scale > 1) scale = 1; 249 int minfree_adj = Resources.getSystem().getInteger( 250 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAdjust); 251 int minfree_abs = Resources.getSystem().getInteger( 252 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAbsolute); 253 if (false) { 254 Slog.i("XXXXXX", "minfree_adj=" + minfree_adj + " minfree_abs=" + minfree_abs); 255 } 256 257 final boolean is64bit = Build.SUPPORTED_64_BIT_ABIS.length > 0; 258 259 for (int i=0; i<mOomAdj.length; i++) { 260 int low = mOomMinFreeLow[i]; 261 int high = mOomMinFreeHigh[i]; 262 if (is64bit) { 263 // Increase the high min-free levels for cached processes for 64-bit 264 if (i == 4) high = (high*3)/2; 265 else if (i == 5) high = (high*7)/4; 266 } 267 mOomMinFree[i] = (int)(low + ((high-low)*scale)); 268 } 269 270 if (minfree_abs >= 0) { 271 for (int i=0; i<mOomAdj.length; i++) { 272 mOomMinFree[i] = (int)((float)minfree_abs * mOomMinFree[i] 273 / mOomMinFree[mOomAdj.length - 1]); 274 } 275 } 276 277 if (minfree_adj != 0) { 278 for (int i=0; i<mOomAdj.length; i++) { 279 mOomMinFree[i] += (int)((float)minfree_adj * mOomMinFree[i] 280 / mOomMinFree[mOomAdj.length - 1]); 281 if (mOomMinFree[i] < 0) { 282 mOomMinFree[i] = 0; 283 } 284 } 285 } 286 287 // The maximum size we will restore a process from cached to background, when under 288 // memory duress, is 1/3 the size we have reserved for kernel caches and other overhead 289 // before killing background processes. 290 mCachedRestoreLevel = (getMemLevel(ProcessList.CACHED_APP_MAX_ADJ)/1024) / 3; 291 292 // Ask the kernel to try to keep enough memory free to allocate 3 full 293 // screen 32bpp buffers without entering direct reclaim. 294 int reserve = displayWidth * displayHeight * 4 * 3 / 1024; 295 int reserve_adj = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAdjust); 296 int reserve_abs = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAbsolute); 297 298 if (reserve_abs >= 0) { 299 reserve = reserve_abs; 300 } 301 302 if (reserve_adj != 0) { 303 reserve += reserve_adj; 304 if (reserve < 0) { 305 reserve = 0; 306 } 307 } 308 309 if (write) { 310 ByteBuffer buf = ByteBuffer.allocate(4 * (2*mOomAdj.length + 1)); 311 buf.putInt(LMK_TARGET); 312 for (int i=0; i<mOomAdj.length; i++) { 313 buf.putInt((mOomMinFree[i]*1024)/PAGE_SIZE); 314 buf.putInt(mOomAdj[i]); 315 } 316 317 writeLmkd(buf); 318 SystemProperties.set("sys.sysctl.extra_free_kbytes", Integer.toString(reserve)); 319 } 320 // GB: 2048,3072,4096,6144,7168,8192 321 // HC: 8192,10240,12288,14336,16384,20480 322 } 323 computeEmptyProcessLimit(int totalProcessLimit)324 public static int computeEmptyProcessLimit(int totalProcessLimit) { 325 return totalProcessLimit/2; 326 } 327 buildOomTag(String prefix, String space, int val, int base)328 private static String buildOomTag(String prefix, String space, int val, int base) { 329 if (val == base) { 330 if (space == null) return prefix; 331 return prefix + " "; 332 } 333 return prefix + "+" + Integer.toString(val-base); 334 } 335 makeOomAdjString(int setAdj)336 public static String makeOomAdjString(int setAdj) { 337 if (setAdj >= ProcessList.CACHED_APP_MIN_ADJ) { 338 return buildOomTag("cch", " ", setAdj, ProcessList.CACHED_APP_MIN_ADJ); 339 } else if (setAdj >= ProcessList.SERVICE_B_ADJ) { 340 return buildOomTag("svcb ", null, setAdj, ProcessList.SERVICE_B_ADJ); 341 } else if (setAdj >= ProcessList.PREVIOUS_APP_ADJ) { 342 return buildOomTag("prev ", null, setAdj, ProcessList.PREVIOUS_APP_ADJ); 343 } else if (setAdj >= ProcessList.HOME_APP_ADJ) { 344 return buildOomTag("home ", null, setAdj, ProcessList.HOME_APP_ADJ); 345 } else if (setAdj >= ProcessList.SERVICE_ADJ) { 346 return buildOomTag("svc ", null, setAdj, ProcessList.SERVICE_ADJ); 347 } else if (setAdj >= ProcessList.HEAVY_WEIGHT_APP_ADJ) { 348 return buildOomTag("hvy ", null, setAdj, ProcessList.HEAVY_WEIGHT_APP_ADJ); 349 } else if (setAdj >= ProcessList.BACKUP_APP_ADJ) { 350 return buildOomTag("bkup ", null, setAdj, ProcessList.BACKUP_APP_ADJ); 351 } else if (setAdj >= ProcessList.PERCEPTIBLE_APP_ADJ) { 352 return buildOomTag("prcp ", null, setAdj, ProcessList.PERCEPTIBLE_APP_ADJ); 353 } else if (setAdj >= ProcessList.VISIBLE_APP_ADJ) { 354 return buildOomTag("vis ", null, setAdj, ProcessList.VISIBLE_APP_ADJ); 355 } else if (setAdj >= ProcessList.FOREGROUND_APP_ADJ) { 356 return buildOomTag("fore ", null, setAdj, ProcessList.FOREGROUND_APP_ADJ); 357 } else if (setAdj >= ProcessList.PERSISTENT_SERVICE_ADJ) { 358 return buildOomTag("psvc ", null, setAdj, ProcessList.PERSISTENT_SERVICE_ADJ); 359 } else if (setAdj >= ProcessList.PERSISTENT_PROC_ADJ) { 360 return buildOomTag("pers ", null, setAdj, ProcessList.PERSISTENT_PROC_ADJ); 361 } else if (setAdj >= ProcessList.SYSTEM_ADJ) { 362 return buildOomTag("sys ", null, setAdj, ProcessList.SYSTEM_ADJ); 363 } else if (setAdj >= ProcessList.NATIVE_ADJ) { 364 return buildOomTag("ntv ", null, setAdj, ProcessList.NATIVE_ADJ); 365 } else { 366 return Integer.toString(setAdj); 367 } 368 } 369 makeProcStateString(int curProcState)370 public static String makeProcStateString(int curProcState) { 371 String procState; 372 switch (curProcState) { 373 case -1: 374 procState = "N "; 375 break; 376 case ActivityManager.PROCESS_STATE_PERSISTENT: 377 procState = "P "; 378 break; 379 case ActivityManager.PROCESS_STATE_PERSISTENT_UI: 380 procState = "PU"; 381 break; 382 case ActivityManager.PROCESS_STATE_TOP: 383 procState = "T "; 384 break; 385 case ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE: 386 procState = "SB"; 387 break; 388 case ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE: 389 procState = "SF"; 390 break; 391 case ActivityManager.PROCESS_STATE_TOP_SLEEPING: 392 procState = "TS"; 393 break; 394 case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND: 395 procState = "IF"; 396 break; 397 case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND: 398 procState = "IB"; 399 break; 400 case ActivityManager.PROCESS_STATE_BACKUP: 401 procState = "BU"; 402 break; 403 case ActivityManager.PROCESS_STATE_HEAVY_WEIGHT: 404 procState = "HW"; 405 break; 406 case ActivityManager.PROCESS_STATE_SERVICE: 407 procState = "S "; 408 break; 409 case ActivityManager.PROCESS_STATE_RECEIVER: 410 procState = "R "; 411 break; 412 case ActivityManager.PROCESS_STATE_HOME: 413 procState = "HO"; 414 break; 415 case ActivityManager.PROCESS_STATE_LAST_ACTIVITY: 416 procState = "LA"; 417 break; 418 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY: 419 procState = "CA"; 420 break; 421 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT: 422 procState = "Ca"; 423 break; 424 case ActivityManager.PROCESS_STATE_CACHED_EMPTY: 425 procState = "CE"; 426 break; 427 default: 428 procState = "??"; 429 break; 430 } 431 return procState; 432 } 433 appendRamKb(StringBuilder sb, long ramKb)434 public static void appendRamKb(StringBuilder sb, long ramKb) { 435 for (int j=0, fact=10; j<6; j++, fact*=10) { 436 if (ramKb < fact) { 437 sb.append(' '); 438 } 439 } 440 sb.append(ramKb); 441 } 442 443 // How long after a state change that it is safe to collect PSS without it being dirty. 444 public static final int PSS_SAFE_TIME_FROM_STATE_CHANGE = 1000; 445 446 // The minimum time interval after a state change it is safe to collect PSS. 447 public static final int PSS_MIN_TIME_FROM_STATE_CHANGE = 15*1000; 448 449 // The maximum amount of time we want to go between PSS collections. 450 public static final int PSS_MAX_INTERVAL = 30*60*1000; 451 452 // The minimum amount of time between successive PSS requests for *all* processes. 453 public static final int PSS_ALL_INTERVAL = 10*60*1000; 454 455 // The minimum amount of time between successive PSS requests for a process. 456 private static final int PSS_SHORT_INTERVAL = 2*60*1000; 457 458 // The amount of time until PSS when a process first becomes top. 459 private static final int PSS_FIRST_TOP_INTERVAL = 10*1000; 460 461 // The amount of time until PSS when a process first goes into the background. 462 private static final int PSS_FIRST_BACKGROUND_INTERVAL = 20*1000; 463 464 // The amount of time until PSS when a process first becomes cached. 465 private static final int PSS_FIRST_CACHED_INTERVAL = 30*1000; 466 467 // The amount of time until PSS when an important process stays in the same state. 468 private static final int PSS_SAME_IMPORTANT_INTERVAL = 15*60*1000; 469 470 // The amount of time until PSS when a service process stays in the same state. 471 private static final int PSS_SAME_SERVICE_INTERVAL = 20*60*1000; 472 473 // The amount of time until PSS when a cached process stays in the same state. 474 private static final int PSS_SAME_CACHED_INTERVAL = 30*60*1000; 475 476 // The minimum time interval after a state change it is safe to collect PSS. 477 public static final int PSS_TEST_MIN_TIME_FROM_STATE_CHANGE = 10*1000; 478 479 // The amount of time during testing until PSS when a process first becomes top. 480 private static final int PSS_TEST_FIRST_TOP_INTERVAL = 3*1000; 481 482 // The amount of time during testing until PSS when a process first goes into the background. 483 private static final int PSS_TEST_FIRST_BACKGROUND_INTERVAL = 5*1000; 484 485 // The amount of time during testing until PSS when an important process stays in same state. 486 private static final int PSS_TEST_SAME_IMPORTANT_INTERVAL = 10*1000; 487 488 // The amount of time during testing until PSS when a background process stays in same state. 489 private static final int PSS_TEST_SAME_BACKGROUND_INTERVAL = 15*1000; 490 491 public static final int PROC_MEM_PERSISTENT = 0; 492 public static final int PROC_MEM_TOP = 1; 493 public static final int PROC_MEM_IMPORTANT = 2; 494 public static final int PROC_MEM_SERVICE = 3; 495 public static final int PROC_MEM_CACHED = 4; 496 497 private static final int[] sProcStateToProcMem = new int[] { 498 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT 499 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 500 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP 501 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 502 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 503 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 504 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 505 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 506 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BACKUP 507 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 508 PROC_MEM_SERVICE, // ActivityManager.PROCESS_STATE_SERVICE 509 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_RECEIVER 510 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_HOME 511 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 512 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 513 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 514 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 515 }; 516 517 private static final long[] sFirstAwakePssTimes = new long[] { 518 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 519 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 520 PSS_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 521 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 522 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 523 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 524 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 525 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 526 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 527 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 528 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 529 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 530 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 531 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 532 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 533 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 534 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 535 }; 536 537 private static final long[] sSameAwakePssTimes = new long[] { 538 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 539 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 540 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 541 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 542 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 543 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 544 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 545 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 546 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 547 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 548 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 549 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 550 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 551 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 552 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 553 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 554 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 555 }; 556 557 private static final long[] sTestFirstAwakePssTimes = new long[] { 558 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 559 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 560 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 561 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 562 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 563 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 564 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 565 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 566 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 567 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 568 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 569 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 570 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 571 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 572 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 573 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 574 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 575 }; 576 577 private static final long[] sTestSameAwakePssTimes = new long[] { 578 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 579 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 580 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 581 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 582 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 583 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 584 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 585 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 586 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 587 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 588 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 589 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 590 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 591 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 592 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 593 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 594 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 595 }; 596 procStatesDifferForMem(int procState1, int procState2)597 public static boolean procStatesDifferForMem(int procState1, int procState2) { 598 return sProcStateToProcMem[procState1] != sProcStateToProcMem[procState2]; 599 } 600 minTimeFromStateChange(boolean test)601 public static long minTimeFromStateChange(boolean test) { 602 return test ? PSS_TEST_MIN_TIME_FROM_STATE_CHANGE : PSS_MIN_TIME_FROM_STATE_CHANGE; 603 } 604 computeNextPssTime(int procState, boolean first, boolean test, boolean sleeping, long now)605 public static long computeNextPssTime(int procState, boolean first, boolean test, 606 boolean sleeping, long now) { 607 final long[] table = test 608 ? (first 609 ? sTestFirstAwakePssTimes 610 : sTestSameAwakePssTimes) 611 : (first 612 ? sFirstAwakePssTimes 613 : sSameAwakePssTimes); 614 return now + table[procState]; 615 } 616 getMemLevel(int adjustment)617 long getMemLevel(int adjustment) { 618 for (int i=0; i<mOomAdj.length; i++) { 619 if (adjustment <= mOomAdj[i]) { 620 return mOomMinFree[i] * 1024; 621 } 622 } 623 return mOomMinFree[mOomAdj.length-1] * 1024; 624 } 625 626 /** 627 * Return the maximum pss size in kb that we consider a process acceptable to 628 * restore from its cached state for running in the background when RAM is low. 629 */ getCachedRestoreThresholdKb()630 long getCachedRestoreThresholdKb() { 631 return mCachedRestoreLevel; 632 } 633 634 /** 635 * Set the out-of-memory badness adjustment for a process. 636 * 637 * @param pid The process identifier to set. 638 * @param uid The uid of the app 639 * @param amt Adjustment value -- lmkd allows -16 to +15. 640 * 641 * {@hide} 642 */ setOomAdj(int pid, int uid, int amt)643 public static final void setOomAdj(int pid, int uid, int amt) { 644 if (amt == UNKNOWN_ADJ) 645 return; 646 647 long start = SystemClock.elapsedRealtime(); 648 ByteBuffer buf = ByteBuffer.allocate(4 * 4); 649 buf.putInt(LMK_PROCPRIO); 650 buf.putInt(pid); 651 buf.putInt(uid); 652 buf.putInt(amt); 653 writeLmkd(buf); 654 long now = SystemClock.elapsedRealtime(); 655 if ((now-start) > 250) { 656 Slog.w("ActivityManager", "SLOW OOM ADJ: " + (now-start) + "ms for pid " + pid 657 + " = " + amt); 658 } 659 } 660 661 /* 662 * {@hide} 663 */ remove(int pid)664 public static final void remove(int pid) { 665 ByteBuffer buf = ByteBuffer.allocate(4 * 2); 666 buf.putInt(LMK_PROCREMOVE); 667 buf.putInt(pid); 668 writeLmkd(buf); 669 } 670 openLmkdSocket()671 private static boolean openLmkdSocket() { 672 try { 673 sLmkdSocket = new LocalSocket(LocalSocket.SOCKET_SEQPACKET); 674 sLmkdSocket.connect( 675 new LocalSocketAddress("lmkd", 676 LocalSocketAddress.Namespace.RESERVED)); 677 sLmkdOutputStream = sLmkdSocket.getOutputStream(); 678 } catch (IOException ex) { 679 Slog.w(TAG, "lowmemorykiller daemon socket open failed"); 680 sLmkdSocket = null; 681 return false; 682 } 683 684 return true; 685 } 686 writeLmkd(ByteBuffer buf)687 private static void writeLmkd(ByteBuffer buf) { 688 689 for (int i = 0; i < 3; i++) { 690 if (sLmkdSocket == null) { 691 if (openLmkdSocket() == false) { 692 try { 693 Thread.sleep(1000); 694 } catch (InterruptedException ie) { 695 } 696 continue; 697 } 698 } 699 700 try { 701 sLmkdOutputStream.write(buf.array(), 0, buf.position()); 702 return; 703 } catch (IOException ex) { 704 Slog.w(TAG, "Error writing to lowmemorykiller socket"); 705 706 try { 707 sLmkdSocket.close(); 708 } catch (IOException ex2) { 709 } 710 711 sLmkdSocket = null; 712 } 713 } 714 } 715 } 716