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 java.io.IOException; 20 import java.io.OutputStream; 21 import java.nio.ByteBuffer; 22 23 import android.app.ActivityManager; 24 import android.os.Build; 25 import android.os.SystemClock; 26 import com.android.internal.util.MemInfoReader; 27 import com.android.server.wm.WindowManagerService; 28 29 import android.content.res.Resources; 30 import android.graphics.Point; 31 import android.os.SystemProperties; 32 import android.net.LocalSocketAddress; 33 import android.net.LocalSocket; 34 import android.util.Slog; 35 import android.view.Display; 36 37 /** 38 * Activity manager code dealing with processes. 39 */ 40 final class ProcessList { 41 // The minimum time we allow between crashes, for us to consider this 42 // application to be bad and stop and its services and reject broadcasts. 43 static final int MIN_CRASH_INTERVAL = 60*1000; 44 45 // OOM adjustments for processes in various states: 46 47 // Adjustment used in certain places where we don't know it yet. 48 // (Generally this is something that is going to be cached, but we 49 // don't know the exact value in the cached range to assign yet.) 50 static final int UNKNOWN_ADJ = 16; 51 52 // This is a process only hosting activities that are not visible, 53 // so it can be killed without any disruption. 54 static final int CACHED_APP_MAX_ADJ = 15; 55 static final int CACHED_APP_MIN_ADJ = 9; 56 57 // The B list of SERVICE_ADJ -- these are the old and decrepit 58 // services that aren't as shiny and interesting as the ones in the A list. 59 static final int SERVICE_B_ADJ = 8; 60 61 // This is the process of the previous application that the user was in. 62 // This process is kept above other things, because it is very common to 63 // switch back to the previous app. This is important both for recent 64 // task switch (toggling between the two top recent apps) as well as normal 65 // UI flow such as clicking on a URI in the e-mail app to view in the browser, 66 // and then pressing back to return to e-mail. 67 static final int PREVIOUS_APP_ADJ = 7; 68 69 // This is a process holding the home application -- we want to try 70 // avoiding killing it, even if it would normally be in the background, 71 // because the user interacts with it so much. 72 static final int HOME_APP_ADJ = 6; 73 74 // This is a process holding an application service -- killing it will not 75 // have much of an impact as far as the user is concerned. 76 static final int SERVICE_ADJ = 5; 77 78 // This is a process with a heavy-weight application. It is in the 79 // background, but we want to try to avoid killing it. Value set in 80 // system/rootdir/init.rc on startup. 81 static final int HEAVY_WEIGHT_APP_ADJ = 4; 82 83 // This is a process currently hosting a backup operation. Killing it 84 // is not entirely fatal but is generally a bad idea. 85 static final int BACKUP_APP_ADJ = 3; 86 87 // This is a process only hosting components that are perceptible to the 88 // user, and we really want to avoid killing them, but they are not 89 // immediately visible. An example is background music playback. 90 static final int PERCEPTIBLE_APP_ADJ = 2; 91 92 // This is a process only hosting activities that are visible to the 93 // user, so we'd prefer they don't disappear. 94 static final int VISIBLE_APP_ADJ = 1; 95 96 // This is the process running the current foreground app. We'd really 97 // rather not kill it! 98 static final int FOREGROUND_APP_ADJ = 0; 99 100 // This is a process that the system or a persistent process has bound to, 101 // and indicated it is important. 102 static final int PERSISTENT_SERVICE_ADJ = -11; 103 104 // This is a system persistent process, such as telephony. Definitely 105 // don't want to kill it, but doing so is not completely fatal. 106 static final int PERSISTENT_PROC_ADJ = -12; 107 108 // The system process runs at the default adjustment. 109 static final int SYSTEM_ADJ = -16; 110 111 // Special code for native processes that are not being managed by the system (so 112 // don't have an oom adj assigned by the system). 113 static final int NATIVE_ADJ = -17; 114 115 // Memory pages are 4K. 116 static final int PAGE_SIZE = 4*1024; 117 118 // The minimum number of cached apps we want to be able to keep around, 119 // without empty apps being able to push them out of memory. 120 static final int MIN_CACHED_APPS = 2; 121 122 // The maximum number of cached processes we will keep around before killing them. 123 // NOTE: this constant is *only* a control to not let us go too crazy with 124 // keeping around processes on devices with large amounts of RAM. For devices that 125 // are tighter on RAM, the out of memory killer is responsible for killing background 126 // processes as RAM is needed, and we should *never* be relying on this limit to 127 // kill them. Also note that this limit only applies to cached background processes; 128 // we have no limit on the number of service, visible, foreground, or other such 129 // processes and the number of those processes does not count against the cached 130 // process limit. 131 static final int MAX_CACHED_APPS = 32; 132 133 // We allow empty processes to stick around for at most 30 minutes. 134 static final long MAX_EMPTY_TIME = 30*60*1000; 135 136 // The maximum number of empty app processes we will let sit around. 137 private static final int MAX_EMPTY_APPS = computeEmptyProcessLimit(MAX_CACHED_APPS); 138 139 // The number of empty apps at which we don't consider it necessary to do 140 // memory trimming. 141 static final int TRIM_EMPTY_APPS = MAX_EMPTY_APPS/2; 142 143 // The number of cached at which we don't consider it necessary to do 144 // memory trimming. 145 static final int TRIM_CACHED_APPS = (MAX_CACHED_APPS-MAX_EMPTY_APPS)/3; 146 147 // Threshold of number of cached+empty where we consider memory critical. 148 static final int TRIM_CRITICAL_THRESHOLD = 3; 149 150 // Threshold of number of cached+empty where we consider memory critical. 151 static final int TRIM_LOW_THRESHOLD = 5; 152 153 // Low Memory Killer Daemon command codes. 154 // These must be kept in sync with the definitions in lmkd.c 155 // 156 // LMK_TARGET <minfree> <minkillprio> ... (up to 6 pairs) 157 // LMK_PROCPRIO <pid> <prio> 158 // LMK_PROCREMOVE <pid> 159 static final byte LMK_TARGET = 0; 160 static final byte LMK_PROCPRIO = 1; 161 static final byte LMK_PROCREMOVE = 2; 162 163 // These are the various interesting memory levels that we will give to 164 // the OOM killer. Note that the OOM killer only supports 6 slots, so we 165 // can't give it a different value for every possible kind of process. 166 private final int[] mOomAdj = new int[] { 167 FOREGROUND_APP_ADJ, VISIBLE_APP_ADJ, PERCEPTIBLE_APP_ADJ, 168 BACKUP_APP_ADJ, CACHED_APP_MIN_ADJ, CACHED_APP_MAX_ADJ 169 }; 170 // These are the low-end OOM level limits. This is appropriate for an 171 // HVGA or smaller phone with less than 512MB. Values are in KB. 172 private final int[] mOomMinFreeLow = new int[] { 173 12288, 18432, 24576, 174 36864, 43008, 49152 175 }; 176 // These are the high-end OOM level limits. This is appropriate for a 177 // 1280x800 or larger screen with around 1GB RAM. Values are in KB. 178 private final int[] mOomMinFreeHigh = new int[] { 179 73728, 92160, 110592, 180 129024, 147456, 184320 181 }; 182 // The actual OOM killer memory levels we are using. 183 private final int[] mOomMinFree = new int[mOomAdj.length]; 184 185 private final long mTotalMemMb; 186 187 private long mCachedRestoreLevel; 188 189 private boolean mHaveDisplaySize; 190 191 private static LocalSocket sLmkdSocket; 192 private static OutputStream sLmkdOutputStream; 193 194 ProcessList() { 195 MemInfoReader minfo = new MemInfoReader(); 196 minfo.readMemInfo(); 197 mTotalMemMb = minfo.getTotalSize()/(1024*1024); 198 updateOomLevels(0, 0, false); 199 } 200 201 void applyDisplaySize(WindowManagerService wm) { 202 if (!mHaveDisplaySize) { 203 Point p = new Point(); 204 wm.getBaseDisplaySize(Display.DEFAULT_DISPLAY, p); 205 if (p.x != 0 && p.y != 0) { 206 updateOomLevels(p.x, p.y, true); 207 mHaveDisplaySize = true; 208 } 209 } 210 } 211 212 private void updateOomLevels(int displayWidth, int displayHeight, boolean write) { 213 // Scale buckets from avail memory: at 300MB we use the lowest values to 214 // 700MB or more for the top values. 215 float scaleMem = ((float)(mTotalMemMb-300))/(700-300); 216 217 // Scale buckets from screen size. 218 int minSize = 480*800; // 384000 219 int maxSize = 1280*800; // 1024000 230400 870400 .264 220 float scaleDisp = ((float)(displayWidth*displayHeight)-minSize)/(maxSize-minSize); 221 if (false) { 222 Slog.i("XXXXXX", "scaleMem=" + scaleMem); 223 Slog.i("XXXXXX", "scaleDisp=" + scaleDisp + " dw=" + displayWidth 224 + " dh=" + displayHeight); 225 } 226 227 float scale = scaleMem > scaleDisp ? scaleMem : scaleDisp; 228 if (scale < 0) scale = 0; 229 else if (scale > 1) scale = 1; 230 int minfree_adj = Resources.getSystem().getInteger( 231 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAdjust); 232 int minfree_abs = Resources.getSystem().getInteger( 233 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAbsolute); 234 if (false) { 235 Slog.i("XXXXXX", "minfree_adj=" + minfree_adj + " minfree_abs=" + minfree_abs); 236 } 237 238 // We've now baked in the increase to the basic oom values above, since 239 // they seem to be useful more generally for devices that are tight on 240 // memory than just for 64 bit. This should probably have some more 241 // tuning done, so not deleting it quite yet... 242 final boolean is64bit = false; //Build.SUPPORTED_64_BIT_ABIS.length > 0; 243 244 for (int i=0; i<mOomAdj.length; i++) { 245 int low = mOomMinFreeLow[i]; 246 int high = mOomMinFreeHigh[i]; 247 mOomMinFree[i] = (int)(low + ((high-low)*scale)); 248 if (is64bit) { 249 // On 64 bit devices, we consume more baseline RAM, because 64 bit is cool! 250 // To avoid being all pagey and stuff, scale up the memory levels to 251 // give us some breathing room. 252 mOomMinFree[i] = (3*mOomMinFree[i])/2; 253 } 254 } 255 256 if (minfree_abs >= 0) { 257 for (int i=0; i<mOomAdj.length; i++) { 258 mOomMinFree[i] = (int)((float)minfree_abs * mOomMinFree[i] 259 / mOomMinFree[mOomAdj.length - 1]); 260 } 261 } 262 263 if (minfree_adj != 0) { 264 for (int i=0; i<mOomAdj.length; i++) { 265 mOomMinFree[i] += (int)((float)minfree_adj * mOomMinFree[i] 266 / mOomMinFree[mOomAdj.length - 1]); 267 if (mOomMinFree[i] < 0) { 268 mOomMinFree[i] = 0; 269 } 270 } 271 } 272 273 // The maximum size we will restore a process from cached to background, when under 274 // memory duress, is 1/3 the size we have reserved for kernel caches and other overhead 275 // before killing background processes. 276 mCachedRestoreLevel = (getMemLevel(ProcessList.CACHED_APP_MAX_ADJ)/1024) / 3; 277 278 // Ask the kernel to try to keep enough memory free to allocate 3 full 279 // screen 32bpp buffers without entering direct reclaim. 280 int reserve = displayWidth * displayHeight * 4 * 3 / 1024; 281 int reserve_adj = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAdjust); 282 int reserve_abs = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAbsolute); 283 284 if (reserve_abs >= 0) { 285 reserve = reserve_abs; 286 } 287 288 if (reserve_adj != 0) { 289 reserve += reserve_adj; 290 if (reserve < 0) { 291 reserve = 0; 292 } 293 } 294 295 if (write) { 296 ByteBuffer buf = ByteBuffer.allocate(4 * (2*mOomAdj.length + 1)); 297 buf.putInt(LMK_TARGET); 298 for (int i=0; i<mOomAdj.length; i++) { 299 buf.putInt((mOomMinFree[i]*1024)/PAGE_SIZE); 300 buf.putInt(mOomAdj[i]); 301 } 302 303 writeLmkd(buf); 304 SystemProperties.set("sys.sysctl.extra_free_kbytes", Integer.toString(reserve)); 305 } 306 // GB: 2048,3072,4096,6144,7168,8192 307 // HC: 8192,10240,12288,14336,16384,20480 308 } 309 310 public static int computeEmptyProcessLimit(int totalProcessLimit) { 311 return totalProcessLimit/2; 312 } 313 314 private static String buildOomTag(String prefix, String space, int val, int base) { 315 if (val == base) { 316 if (space == null) return prefix; 317 return prefix + " "; 318 } 319 return prefix + "+" + Integer.toString(val-base); 320 } 321 322 public static String makeOomAdjString(int setAdj) { 323 if (setAdj >= ProcessList.CACHED_APP_MIN_ADJ) { 324 return buildOomTag("cch", " ", setAdj, ProcessList.CACHED_APP_MIN_ADJ); 325 } else if (setAdj >= ProcessList.SERVICE_B_ADJ) { 326 return buildOomTag("svcb ", null, setAdj, ProcessList.SERVICE_B_ADJ); 327 } else if (setAdj >= ProcessList.PREVIOUS_APP_ADJ) { 328 return buildOomTag("prev ", null, setAdj, ProcessList.PREVIOUS_APP_ADJ); 329 } else if (setAdj >= ProcessList.HOME_APP_ADJ) { 330 return buildOomTag("home ", null, setAdj, ProcessList.HOME_APP_ADJ); 331 } else if (setAdj >= ProcessList.SERVICE_ADJ) { 332 return buildOomTag("svc ", null, setAdj, ProcessList.SERVICE_ADJ); 333 } else if (setAdj >= ProcessList.HEAVY_WEIGHT_APP_ADJ) { 334 return buildOomTag("hvy ", null, setAdj, ProcessList.HEAVY_WEIGHT_APP_ADJ); 335 } else if (setAdj >= ProcessList.BACKUP_APP_ADJ) { 336 return buildOomTag("bkup ", null, setAdj, ProcessList.BACKUP_APP_ADJ); 337 } else if (setAdj >= ProcessList.PERCEPTIBLE_APP_ADJ) { 338 return buildOomTag("prcp ", null, setAdj, ProcessList.PERCEPTIBLE_APP_ADJ); 339 } else if (setAdj >= ProcessList.VISIBLE_APP_ADJ) { 340 return buildOomTag("vis ", null, setAdj, ProcessList.VISIBLE_APP_ADJ); 341 } else if (setAdj >= ProcessList.FOREGROUND_APP_ADJ) { 342 return buildOomTag("fore ", null, setAdj, ProcessList.FOREGROUND_APP_ADJ); 343 } else if (setAdj >= ProcessList.PERSISTENT_SERVICE_ADJ) { 344 return buildOomTag("psvc ", null, setAdj, ProcessList.PERSISTENT_SERVICE_ADJ); 345 } else if (setAdj >= ProcessList.PERSISTENT_PROC_ADJ) { 346 return buildOomTag("pers ", null, setAdj, ProcessList.PERSISTENT_PROC_ADJ); 347 } else if (setAdj >= ProcessList.SYSTEM_ADJ) { 348 return buildOomTag("sys ", null, setAdj, ProcessList.SYSTEM_ADJ); 349 } else if (setAdj >= ProcessList.NATIVE_ADJ) { 350 return buildOomTag("ntv ", null, setAdj, ProcessList.NATIVE_ADJ); 351 } else { 352 return Integer.toString(setAdj); 353 } 354 } 355 356 public static String makeProcStateString(int curProcState) { 357 String procState; 358 switch (curProcState) { 359 case -1: 360 procState = "N "; 361 break; 362 case ActivityManager.PROCESS_STATE_PERSISTENT: 363 procState = "P "; 364 break; 365 case ActivityManager.PROCESS_STATE_PERSISTENT_UI: 366 procState = "PU"; 367 break; 368 case ActivityManager.PROCESS_STATE_TOP: 369 procState = "T "; 370 break; 371 case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND: 372 procState = "IF"; 373 break; 374 case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND: 375 procState = "IB"; 376 break; 377 case ActivityManager.PROCESS_STATE_BACKUP: 378 procState = "BU"; 379 break; 380 case ActivityManager.PROCESS_STATE_HEAVY_WEIGHT: 381 procState = "HW"; 382 break; 383 case ActivityManager.PROCESS_STATE_SERVICE: 384 procState = "S "; 385 break; 386 case ActivityManager.PROCESS_STATE_RECEIVER: 387 procState = "R "; 388 break; 389 case ActivityManager.PROCESS_STATE_HOME: 390 procState = "HO"; 391 break; 392 case ActivityManager.PROCESS_STATE_LAST_ACTIVITY: 393 procState = "LA"; 394 break; 395 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY: 396 procState = "CA"; 397 break; 398 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT: 399 procState = "Ca"; 400 break; 401 case ActivityManager.PROCESS_STATE_CACHED_EMPTY: 402 procState = "CE"; 403 break; 404 default: 405 procState = "??"; 406 break; 407 } 408 return procState; 409 } 410 411 public static void appendRamKb(StringBuilder sb, long ramKb) { 412 for (int j=0, fact=10; j<6; j++, fact*=10) { 413 if (ramKb < fact) { 414 sb.append(' '); 415 } 416 } 417 sb.append(ramKb); 418 } 419 420 // The minimum amount of time after a state change it is safe ro collect PSS. 421 public static final int PSS_MIN_TIME_FROM_STATE_CHANGE = 15*1000; 422 423 // The maximum amount of time we want to go between PSS collections. 424 public static final int PSS_MAX_INTERVAL = 30*60*1000; 425 426 // The minimum amount of time between successive PSS requests for *all* processes. 427 public static final int PSS_ALL_INTERVAL = 10*60*1000; 428 429 // The minimum amount of time between successive PSS requests for a process. 430 private static final int PSS_SHORT_INTERVAL = 2*60*1000; 431 432 // The amount of time until PSS when a process first becomes top. 433 private static final int PSS_FIRST_TOP_INTERVAL = 10*1000; 434 435 // The amount of time until PSS when a process first goes into the background. 436 private static final int PSS_FIRST_BACKGROUND_INTERVAL = 20*1000; 437 438 // The amount of time until PSS when a process first becomes cached. 439 private static final int PSS_FIRST_CACHED_INTERVAL = 30*1000; 440 441 // The amount of time until PSS when an important process stays in the same state. 442 private static final int PSS_SAME_IMPORTANT_INTERVAL = 15*60*1000; 443 444 // The amount of time until PSS when a service process stays in the same state. 445 private static final int PSS_SAME_SERVICE_INTERVAL = 20*60*1000; 446 447 // The amount of time until PSS when a cached process stays in the same state. 448 private static final int PSS_SAME_CACHED_INTERVAL = 30*60*1000; 449 450 public static final int PROC_MEM_PERSISTENT = 0; 451 public static final int PROC_MEM_TOP = 1; 452 public static final int PROC_MEM_IMPORTANT = 2; 453 public static final int PROC_MEM_SERVICE = 3; 454 public static final int PROC_MEM_CACHED = 4; 455 456 private static final int[] sProcStateToProcMem = new int[] { 457 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT 458 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 459 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP 460 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 461 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 462 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BACKUP 463 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 464 PROC_MEM_SERVICE, // ActivityManager.PROCESS_STATE_SERVICE 465 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_RECEIVER 466 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_HOME 467 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 468 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 469 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 470 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 471 }; 472 473 private static final long[] sFirstAwakePssTimes = new long[] { 474 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 475 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 476 PSS_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 477 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 478 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 479 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 480 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 481 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 482 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 483 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 484 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 485 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 486 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 487 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 488 }; 489 490 private static final long[] sSameAwakePssTimes = new long[] { 491 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 492 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 493 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 494 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 495 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 496 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 497 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 498 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 499 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 500 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 501 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 502 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 503 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 504 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 505 }; 506 507 public static boolean procStatesDifferForMem(int procState1, int procState2) { 508 return sProcStateToProcMem[procState1] != sProcStateToProcMem[procState2]; 509 } 510 511 public static long computeNextPssTime(int procState, boolean first, boolean sleeping, 512 long now) { 513 final long[] table = sleeping 514 ? (first 515 ? sFirstAwakePssTimes 516 : sSameAwakePssTimes) 517 : (first 518 ? sFirstAwakePssTimes 519 : sSameAwakePssTimes); 520 return now + table[procState]; 521 } 522 523 long getMemLevel(int adjustment) { 524 for (int i=0; i<mOomAdj.length; i++) { 525 if (adjustment <= mOomAdj[i]) { 526 return mOomMinFree[i] * 1024; 527 } 528 } 529 return mOomMinFree[mOomAdj.length-1] * 1024; 530 } 531 532 /** 533 * Return the maximum pss size in kb that we consider a process acceptable to 534 * restore from its cached state for running in the background when RAM is low. 535 */ 536 long getCachedRestoreThresholdKb() { 537 return mCachedRestoreLevel; 538 } 539 540 /** 541 * Set the out-of-memory badness adjustment for a process. 542 * 543 * @param pid The process identifier to set. 544 * @param uid The uid of the app 545 * @param amt Adjustment value -- lmkd allows -16 to +15. 546 * 547 * {@hide} 548 */ 549 public static final void setOomAdj(int pid, int uid, int amt) { 550 if (amt == UNKNOWN_ADJ) 551 return; 552 553 long start = SystemClock.elapsedRealtime(); 554 ByteBuffer buf = ByteBuffer.allocate(4 * 4); 555 buf.putInt(LMK_PROCPRIO); 556 buf.putInt(pid); 557 buf.putInt(uid); 558 buf.putInt(amt); 559 writeLmkd(buf); 560 long now = SystemClock.elapsedRealtime(); 561 if ((now-start) > 250) { 562 Slog.w("ActivityManager", "SLOW OOM ADJ: " + (now-start) + "ms for pid " + pid 563 + " = " + amt); 564 } 565 } 566 567 /* 568 * {@hide} 569 */ 570 public static final void remove(int pid) { 571 ByteBuffer buf = ByteBuffer.allocate(4 * 2); 572 buf.putInt(LMK_PROCREMOVE); 573 buf.putInt(pid); 574 writeLmkd(buf); 575 } 576 577 private static boolean openLmkdSocket() { 578 try { 579 sLmkdSocket = new LocalSocket(LocalSocket.SOCKET_SEQPACKET); 580 sLmkdSocket.connect( 581 new LocalSocketAddress("lmkd", 582 LocalSocketAddress.Namespace.RESERVED)); 583 sLmkdOutputStream = sLmkdSocket.getOutputStream(); 584 } catch (IOException ex) { 585 Slog.w(ActivityManagerService.TAG, 586 "lowmemorykiller daemon socket open failed"); 587 sLmkdSocket = null; 588 return false; 589 } 590 591 return true; 592 } 593 594 private static void writeLmkd(ByteBuffer buf) { 595 596 for (int i = 0; i < 3; i++) { 597 if (sLmkdSocket == null) { 598 if (openLmkdSocket() == false) { 599 try { 600 Thread.sleep(1000); 601 } catch (InterruptedException ie) { 602 } 603 continue; 604 } 605 } 606 607 try { 608 sLmkdOutputStream.write(buf.array(), 0, buf.position()); 609 return; 610 } catch (IOException ex) { 611 Slog.w(ActivityManagerService.TAG, 612 "Error writing to lowmemorykiller socket"); 613 614 try { 615 sLmkdSocket.close(); 616 } catch (IOException ex2) { 617 } 618 619 sLmkdSocket = null; 620 } 621 } 622 } 623 } 624
