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; 133 134 // The minimum number of cached apps we want to be able to keep around, 135 // without empty apps being able to push them out of memory. 136 static final int MIN_CACHED_APPS = 2; 137 138 // The maximum number of cached processes we will keep around before killing them. 139 // NOTE: this constant is *only* a control to not let us go too crazy with 140 // keeping around processes on devices with large amounts of RAM. For devices that 141 // are tighter on RAM, the out of memory killer is responsible for killing background 142 // processes as RAM is needed, and we should *never* be relying on this limit to 143 // kill them. Also note that this limit only applies to cached background processes; 144 // we have no limit on the number of service, visible, foreground, or other such 145 // processes and the number of those processes does not count against the cached 146 // process limit. 147 static final int MAX_CACHED_APPS = 32; 148 149 // We allow empty processes to stick around for at most 30 minutes. 150 static final long MAX_EMPTY_TIME = 30*60*1000; 151 152 // The maximum number of empty app processes we will let sit around. 153 private static final int MAX_EMPTY_APPS = computeEmptyProcessLimit(MAX_CACHED_APPS); 154 155 // The number of empty apps at which we don't consider it necessary to do 156 // memory trimming. 157 static final int TRIM_EMPTY_APPS = MAX_EMPTY_APPS/2; 158 159 // The number of cached at which we don't consider it necessary to do 160 // memory trimming. 161 static final int TRIM_CACHED_APPS = (MAX_CACHED_APPS-MAX_EMPTY_APPS)/3; 162 163 // Threshold of number of cached+empty where we consider memory critical. 164 static final int TRIM_CRITICAL_THRESHOLD = 3; 165 166 // Threshold of number of cached+empty where we consider memory critical. 167 static final int TRIM_LOW_THRESHOLD = 5; 168 169 // Low Memory Killer Daemon command codes. 170 // These must be kept in sync with the definitions in lmkd.c 171 // 172 // LMK_TARGET <minfree> <minkillprio> ... (up to 6 pairs) 173 // LMK_PROCPRIO <pid> <uid> <prio> 174 // LMK_PROCREMOVE <pid> 175 static final byte LMK_TARGET = 0; 176 static final byte LMK_PROCPRIO = 1; 177 static final byte LMK_PROCREMOVE = 2; 178 179 // These are the various interesting memory levels that we will give to 180 // the OOM killer. Note that the OOM killer only supports 6 slots, so we 181 // can't give it a different value for every possible kind of process. 182 private final int[] mOomAdj = new int[] { 183 FOREGROUND_APP_ADJ, VISIBLE_APP_ADJ, PERCEPTIBLE_APP_ADJ, 184 BACKUP_APP_ADJ, CACHED_APP_MIN_ADJ, CACHED_APP_MAX_ADJ 185 }; 186 // These are the low-end OOM level limits. This is appropriate for an 187 // HVGA or smaller phone with less than 512MB. Values are in KB. 188 private final int[] mOomMinFreeLow = new int[] { 189 12288, 18432, 24576, 190 36864, 43008, 49152 191 }; 192 // These are the high-end OOM level limits. This is appropriate for a 193 // 1280x800 or larger screen with around 1GB RAM. Values are in KB. 194 private final int[] mOomMinFreeHigh = new int[] { 195 73728, 92160, 110592, 196 129024, 147456, 184320 197 }; 198 // The actual OOM killer memory levels we are using. 199 private final int[] mOomMinFree = new int[mOomAdj.length]; 200 201 private final long mTotalMemMb; 202 203 private long mCachedRestoreLevel; 204 205 private boolean mHaveDisplaySize; 206 207 private static LocalSocket sLmkdSocket; 208 private static OutputStream sLmkdOutputStream; 209 ProcessList()210 ProcessList() { 211 MemInfoReader minfo = new MemInfoReader(); 212 minfo.readMemInfo(); 213 mTotalMemMb = minfo.getTotalSize()/(1024*1024); 214 updateOomLevels(0, 0, false); 215 } 216 applyDisplaySize(WindowManagerService wm)217 void applyDisplaySize(WindowManagerService wm) { 218 if (!mHaveDisplaySize) { 219 Point p = new Point(); 220 wm.getBaseDisplaySize(Display.DEFAULT_DISPLAY, p); 221 if (p.x != 0 && p.y != 0) { 222 updateOomLevels(p.x, p.y, true); 223 mHaveDisplaySize = true; 224 } 225 } 226 } 227 updateOomLevels(int displayWidth, int displayHeight, boolean write)228 private void updateOomLevels(int displayWidth, int displayHeight, boolean write) { 229 // Scale buckets from avail memory: at 300MB we use the lowest values to 230 // 700MB or more for the top values. 231 float scaleMem = ((float)(mTotalMemMb-350))/(700-350); 232 233 // Scale buckets from screen size. 234 int minSize = 480*800; // 384000 235 int maxSize = 1280*800; // 1024000 230400 870400 .264 236 float scaleDisp = ((float)(displayWidth*displayHeight)-minSize)/(maxSize-minSize); 237 if (false) { 238 Slog.i("XXXXXX", "scaleMem=" + scaleMem); 239 Slog.i("XXXXXX", "scaleDisp=" + scaleDisp + " dw=" + displayWidth 240 + " dh=" + displayHeight); 241 } 242 243 float scale = scaleMem > scaleDisp ? scaleMem : scaleDisp; 244 if (scale < 0) scale = 0; 245 else if (scale > 1) scale = 1; 246 int minfree_adj = Resources.getSystem().getInteger( 247 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAdjust); 248 int minfree_abs = Resources.getSystem().getInteger( 249 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAbsolute); 250 if (false) { 251 Slog.i("XXXXXX", "minfree_adj=" + minfree_adj + " minfree_abs=" + minfree_abs); 252 } 253 254 final boolean is64bit = Build.SUPPORTED_64_BIT_ABIS.length > 0; 255 256 for (int i=0; i<mOomAdj.length; i++) { 257 int low = mOomMinFreeLow[i]; 258 int high = mOomMinFreeHigh[i]; 259 if (is64bit) { 260 // Increase the high min-free levels for cached processes for 64-bit 261 if (i == 4) high = (high*3)/2; 262 else if (i == 5) high = (high*7)/4; 263 } 264 mOomMinFree[i] = (int)(low + ((high-low)*scale)); 265 } 266 267 if (minfree_abs >= 0) { 268 for (int i=0; i<mOomAdj.length; i++) { 269 mOomMinFree[i] = (int)((float)minfree_abs * mOomMinFree[i] 270 / mOomMinFree[mOomAdj.length - 1]); 271 } 272 } 273 274 if (minfree_adj != 0) { 275 for (int i=0; i<mOomAdj.length; i++) { 276 mOomMinFree[i] += (int)((float)minfree_adj * mOomMinFree[i] 277 / mOomMinFree[mOomAdj.length - 1]); 278 if (mOomMinFree[i] < 0) { 279 mOomMinFree[i] = 0; 280 } 281 } 282 } 283 284 // The maximum size we will restore a process from cached to background, when under 285 // memory duress, is 1/3 the size we have reserved for kernel caches and other overhead 286 // before killing background processes. 287 mCachedRestoreLevel = (getMemLevel(ProcessList.CACHED_APP_MAX_ADJ)/1024) / 3; 288 289 // Ask the kernel to try to keep enough memory free to allocate 3 full 290 // screen 32bpp buffers without entering direct reclaim. 291 int reserve = displayWidth * displayHeight * 4 * 3 / 1024; 292 int reserve_adj = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAdjust); 293 int reserve_abs = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAbsolute); 294 295 if (reserve_abs >= 0) { 296 reserve = reserve_abs; 297 } 298 299 if (reserve_adj != 0) { 300 reserve += reserve_adj; 301 if (reserve < 0) { 302 reserve = 0; 303 } 304 } 305 306 if (write) { 307 ByteBuffer buf = ByteBuffer.allocate(4 * (2*mOomAdj.length + 1)); 308 buf.putInt(LMK_TARGET); 309 for (int i=0; i<mOomAdj.length; i++) { 310 buf.putInt((mOomMinFree[i]*1024)/PAGE_SIZE); 311 buf.putInt(mOomAdj[i]); 312 } 313 314 writeLmkd(buf); 315 SystemProperties.set("sys.sysctl.extra_free_kbytes", Integer.toString(reserve)); 316 } 317 // GB: 2048,3072,4096,6144,7168,8192 318 // HC: 8192,10240,12288,14336,16384,20480 319 } 320 computeEmptyProcessLimit(int totalProcessLimit)321 public static int computeEmptyProcessLimit(int totalProcessLimit) { 322 return totalProcessLimit/2; 323 } 324 buildOomTag(String prefix, String space, int val, int base)325 private static String buildOomTag(String prefix, String space, int val, int base) { 326 if (val == base) { 327 if (space == null) return prefix; 328 return prefix + " "; 329 } 330 return prefix + "+" + Integer.toString(val-base); 331 } 332 makeOomAdjString(int setAdj)333 public static String makeOomAdjString(int setAdj) { 334 if (setAdj >= ProcessList.CACHED_APP_MIN_ADJ) { 335 return buildOomTag("cch", " ", setAdj, ProcessList.CACHED_APP_MIN_ADJ); 336 } else if (setAdj >= ProcessList.SERVICE_B_ADJ) { 337 return buildOomTag("svcb ", null, setAdj, ProcessList.SERVICE_B_ADJ); 338 } else if (setAdj >= ProcessList.PREVIOUS_APP_ADJ) { 339 return buildOomTag("prev ", null, setAdj, ProcessList.PREVIOUS_APP_ADJ); 340 } else if (setAdj >= ProcessList.HOME_APP_ADJ) { 341 return buildOomTag("home ", null, setAdj, ProcessList.HOME_APP_ADJ); 342 } else if (setAdj >= ProcessList.SERVICE_ADJ) { 343 return buildOomTag("svc ", null, setAdj, ProcessList.SERVICE_ADJ); 344 } else if (setAdj >= ProcessList.HEAVY_WEIGHT_APP_ADJ) { 345 return buildOomTag("hvy ", null, setAdj, ProcessList.HEAVY_WEIGHT_APP_ADJ); 346 } else if (setAdj >= ProcessList.BACKUP_APP_ADJ) { 347 return buildOomTag("bkup ", null, setAdj, ProcessList.BACKUP_APP_ADJ); 348 } else if (setAdj >= ProcessList.PERCEPTIBLE_APP_ADJ) { 349 return buildOomTag("prcp ", null, setAdj, ProcessList.PERCEPTIBLE_APP_ADJ); 350 } else if (setAdj >= ProcessList.VISIBLE_APP_ADJ) { 351 return buildOomTag("vis ", null, setAdj, ProcessList.VISIBLE_APP_ADJ); 352 } else if (setAdj >= ProcessList.FOREGROUND_APP_ADJ) { 353 return buildOomTag("fore ", null, setAdj, ProcessList.FOREGROUND_APP_ADJ); 354 } else if (setAdj >= ProcessList.PERSISTENT_SERVICE_ADJ) { 355 return buildOomTag("psvc ", null, setAdj, ProcessList.PERSISTENT_SERVICE_ADJ); 356 } else if (setAdj >= ProcessList.PERSISTENT_PROC_ADJ) { 357 return buildOomTag("pers ", null, setAdj, ProcessList.PERSISTENT_PROC_ADJ); 358 } else if (setAdj >= ProcessList.SYSTEM_ADJ) { 359 return buildOomTag("sys ", null, setAdj, ProcessList.SYSTEM_ADJ); 360 } else if (setAdj >= ProcessList.NATIVE_ADJ) { 361 return buildOomTag("ntv ", null, setAdj, ProcessList.NATIVE_ADJ); 362 } else { 363 return Integer.toString(setAdj); 364 } 365 } 366 makeProcStateString(int curProcState)367 public static String makeProcStateString(int curProcState) { 368 String procState; 369 switch (curProcState) { 370 case -1: 371 procState = "N "; 372 break; 373 case ActivityManager.PROCESS_STATE_PERSISTENT: 374 procState = "P "; 375 break; 376 case ActivityManager.PROCESS_STATE_PERSISTENT_UI: 377 procState = "PU"; 378 break; 379 case ActivityManager.PROCESS_STATE_TOP: 380 procState = "T "; 381 break; 382 case ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE: 383 procState = "SB"; 384 break; 385 case ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE: 386 procState = "SF"; 387 break; 388 case ActivityManager.PROCESS_STATE_TOP_SLEEPING: 389 procState = "TS"; 390 break; 391 case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND: 392 procState = "IF"; 393 break; 394 case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND: 395 procState = "IB"; 396 break; 397 case ActivityManager.PROCESS_STATE_BACKUP: 398 procState = "BU"; 399 break; 400 case ActivityManager.PROCESS_STATE_HEAVY_WEIGHT: 401 procState = "HW"; 402 break; 403 case ActivityManager.PROCESS_STATE_SERVICE: 404 procState = "S "; 405 break; 406 case ActivityManager.PROCESS_STATE_RECEIVER: 407 procState = "R "; 408 break; 409 case ActivityManager.PROCESS_STATE_HOME: 410 procState = "HO"; 411 break; 412 case ActivityManager.PROCESS_STATE_LAST_ACTIVITY: 413 procState = "LA"; 414 break; 415 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY: 416 procState = "CA"; 417 break; 418 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT: 419 procState = "Ca"; 420 break; 421 case ActivityManager.PROCESS_STATE_CACHED_EMPTY: 422 procState = "CE"; 423 break; 424 default: 425 procState = "??"; 426 break; 427 } 428 return procState; 429 } 430 appendRamKb(StringBuilder sb, long ramKb)431 public static void appendRamKb(StringBuilder sb, long ramKb) { 432 for (int j=0, fact=10; j<6; j++, fact*=10) { 433 if (ramKb < fact) { 434 sb.append(' '); 435 } 436 } 437 sb.append(ramKb); 438 } 439 440 // How long after a state change that it is safe to collect PSS without it being dirty. 441 public static final int PSS_SAFE_TIME_FROM_STATE_CHANGE = 1000; 442 443 // The minimum time interval after a state change it is safe to collect PSS. 444 public static final int PSS_MIN_TIME_FROM_STATE_CHANGE = 15*1000; 445 446 // The maximum amount of time we want to go between PSS collections. 447 public static final int PSS_MAX_INTERVAL = 30*60*1000; 448 449 // The minimum amount of time between successive PSS requests for *all* processes. 450 public static final int PSS_ALL_INTERVAL = 10*60*1000; 451 452 // The minimum amount of time between successive PSS requests for a process. 453 private static final int PSS_SHORT_INTERVAL = 2*60*1000; 454 455 // The amount of time until PSS when a process first becomes top. 456 private static final int PSS_FIRST_TOP_INTERVAL = 10*1000; 457 458 // The amount of time until PSS when a process first goes into the background. 459 private static final int PSS_FIRST_BACKGROUND_INTERVAL = 20*1000; 460 461 // The amount of time until PSS when a process first becomes cached. 462 private static final int PSS_FIRST_CACHED_INTERVAL = 30*1000; 463 464 // The amount of time until PSS when an important process stays in the same state. 465 private static final int PSS_SAME_IMPORTANT_INTERVAL = 15*60*1000; 466 467 // The amount of time until PSS when a service process stays in the same state. 468 private static final int PSS_SAME_SERVICE_INTERVAL = 20*60*1000; 469 470 // The amount of time until PSS when a cached process stays in the same state. 471 private static final int PSS_SAME_CACHED_INTERVAL = 30*60*1000; 472 473 // The minimum time interval after a state change it is safe to collect PSS. 474 public static final int PSS_TEST_MIN_TIME_FROM_STATE_CHANGE = 10*1000; 475 476 // The amount of time during testing until PSS when a process first becomes top. 477 private static final int PSS_TEST_FIRST_TOP_INTERVAL = 3*1000; 478 479 // The amount of time during testing until PSS when a process first goes into the background. 480 private static final int PSS_TEST_FIRST_BACKGROUND_INTERVAL = 5*1000; 481 482 // The amount of time during testing until PSS when an important process stays in same state. 483 private static final int PSS_TEST_SAME_IMPORTANT_INTERVAL = 10*1000; 484 485 // The amount of time during testing until PSS when a background process stays in same state. 486 private static final int PSS_TEST_SAME_BACKGROUND_INTERVAL = 15*1000; 487 488 public static final int PROC_MEM_PERSISTENT = 0; 489 public static final int PROC_MEM_TOP = 1; 490 public static final int PROC_MEM_IMPORTANT = 2; 491 public static final int PROC_MEM_SERVICE = 3; 492 public static final int PROC_MEM_CACHED = 4; 493 494 private static final int[] sProcStateToProcMem = new int[] { 495 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT 496 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 497 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP 498 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 499 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 500 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 501 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 502 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 503 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BACKUP 504 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 505 PROC_MEM_SERVICE, // ActivityManager.PROCESS_STATE_SERVICE 506 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_RECEIVER 507 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_HOME 508 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 509 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 510 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 511 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 512 }; 513 514 private static final long[] sFirstAwakePssTimes = new long[] { 515 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 516 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 517 PSS_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 518 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 519 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 520 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 521 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 522 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 523 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 524 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 525 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 526 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 527 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 528 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 529 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 530 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 531 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 532 }; 533 534 private static final long[] sSameAwakePssTimes = new long[] { 535 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 536 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 537 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 538 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 539 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 540 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 541 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 542 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 543 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 544 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 545 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 546 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 547 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 548 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 549 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 550 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 551 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 552 }; 553 554 private static final long[] sTestFirstAwakePssTimes = new long[] { 555 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 556 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 557 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 558 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 559 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 560 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 561 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 562 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 563 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 564 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 565 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 566 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 567 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 568 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 569 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 570 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 571 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 572 }; 573 574 private static final long[] sTestSameAwakePssTimes = new long[] { 575 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 576 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 577 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 578 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 579 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 580 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 581 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 582 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 583 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 584 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 585 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 586 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 587 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 588 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 589 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 590 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 591 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 592 }; 593 procStatesDifferForMem(int procState1, int procState2)594 public static boolean procStatesDifferForMem(int procState1, int procState2) { 595 return sProcStateToProcMem[procState1] != sProcStateToProcMem[procState2]; 596 } 597 minTimeFromStateChange(boolean test)598 public static long minTimeFromStateChange(boolean test) { 599 return test ? PSS_TEST_MIN_TIME_FROM_STATE_CHANGE : PSS_MIN_TIME_FROM_STATE_CHANGE; 600 } 601 computeNextPssTime(int procState, boolean first, boolean test, boolean sleeping, long now)602 public static long computeNextPssTime(int procState, boolean first, boolean test, 603 boolean sleeping, long now) { 604 final long[] table = test 605 ? (first 606 ? sTestFirstAwakePssTimes 607 : sTestSameAwakePssTimes) 608 : (first 609 ? sFirstAwakePssTimes 610 : sSameAwakePssTimes); 611 return now + table[procState]; 612 } 613 getMemLevel(int adjustment)614 long getMemLevel(int adjustment) { 615 for (int i=0; i<mOomAdj.length; i++) { 616 if (adjustment <= mOomAdj[i]) { 617 return mOomMinFree[i] * 1024; 618 } 619 } 620 return mOomMinFree[mOomAdj.length-1] * 1024; 621 } 622 623 /** 624 * Return the maximum pss size in kb that we consider a process acceptable to 625 * restore from its cached state for running in the background when RAM is low. 626 */ getCachedRestoreThresholdKb()627 long getCachedRestoreThresholdKb() { 628 return mCachedRestoreLevel; 629 } 630 631 /** 632 * Set the out-of-memory badness adjustment for a process. 633 * 634 * @param pid The process identifier to set. 635 * @param uid The uid of the app 636 * @param amt Adjustment value -- lmkd allows -16 to +15. 637 * 638 * {@hide} 639 */ setOomAdj(int pid, int uid, int amt)640 public static final void setOomAdj(int pid, int uid, int amt) { 641 if (amt == UNKNOWN_ADJ) 642 return; 643 644 long start = SystemClock.elapsedRealtime(); 645 ByteBuffer buf = ByteBuffer.allocate(4 * 4); 646 buf.putInt(LMK_PROCPRIO); 647 buf.putInt(pid); 648 buf.putInt(uid); 649 buf.putInt(amt); 650 writeLmkd(buf); 651 long now = SystemClock.elapsedRealtime(); 652 if ((now-start) > 250) { 653 Slog.w("ActivityManager", "SLOW OOM ADJ: " + (now-start) + "ms for pid " + pid 654 + " = " + amt); 655 } 656 } 657 658 /* 659 * {@hide} 660 */ remove(int pid)661 public static final void remove(int pid) { 662 ByteBuffer buf = ByteBuffer.allocate(4 * 2); 663 buf.putInt(LMK_PROCREMOVE); 664 buf.putInt(pid); 665 writeLmkd(buf); 666 } 667 openLmkdSocket()668 private static boolean openLmkdSocket() { 669 try { 670 sLmkdSocket = new LocalSocket(LocalSocket.SOCKET_SEQPACKET); 671 sLmkdSocket.connect( 672 new LocalSocketAddress("lmkd", 673 LocalSocketAddress.Namespace.RESERVED)); 674 sLmkdOutputStream = sLmkdSocket.getOutputStream(); 675 } catch (IOException ex) { 676 Slog.w(TAG, "lowmemorykiller daemon socket open failed"); 677 sLmkdSocket = null; 678 return false; 679 } 680 681 return true; 682 } 683 writeLmkd(ByteBuffer buf)684 private static void writeLmkd(ByteBuffer buf) { 685 686 for (int i = 0; i < 3; i++) { 687 if (sLmkdSocket == null) { 688 if (openLmkdSocket() == false) { 689 try { 690 Thread.sleep(1000); 691 } catch (InterruptedException ie) { 692 } 693 continue; 694 } 695 } 696 697 try { 698 sLmkdOutputStream.write(buf.array(), 0, buf.position()); 699 return; 700 } catch (IOException ex) { 701 Slog.w(TAG, "Error writing to lowmemorykiller socket"); 702 703 try { 704 sLmkdSocket.close(); 705 } catch (IOException ex2) { 706 } 707 708 sLmkdSocket = null; 709 } 710 } 711 } 712 } 713