ProcessList.java revision d908edd810dd22d8ec512a19c32637df464e9d0a
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 java.io.IOException; 20import java.io.OutputStream; 21import java.nio.ByteBuffer; 22 23import android.app.ActivityManager; 24import com.android.internal.util.MemInfoReader; 25import com.android.server.wm.WindowManagerService; 26 27import android.content.res.Resources; 28import android.graphics.Point; 29import android.os.SystemProperties; 30import android.net.LocalSocketAddress; 31import android.net.LocalSocket; 32import android.util.Slog; 33import android.view.Display; 34 35/** 36 * Activity manager code dealing with processes. 37 */ 38final class ProcessList { 39 // The minimum time we allow between crashes, for us to consider this 40 // application to be bad and stop and its services and reject broadcasts. 41 static final int MIN_CRASH_INTERVAL = 60*1000; 42 43 // OOM adjustments for processes in various states: 44 45 // Adjustment used in certain places where we don't know it yet. 46 // (Generally this is something that is going to be cached, but we 47 // don't know the exact value in the cached range to assign yet.) 48 static final int UNKNOWN_ADJ = 16; 49 50 // This is a process only hosting activities that are not visible, 51 // so it can be killed without any disruption. 52 static final int CACHED_APP_MAX_ADJ = 15; 53 static final int CACHED_APP_MIN_ADJ = 9; 54 55 // The B list of SERVICE_ADJ -- these are the old and decrepit 56 // services that aren't as shiny and interesting as the ones in the A list. 57 static final int SERVICE_B_ADJ = 8; 58 59 // This is the process of the previous application that the user was in. 60 // This process is kept above other things, because it is very common to 61 // switch back to the previous app. This is important both for recent 62 // task switch (toggling between the two top recent apps) as well as normal 63 // UI flow such as clicking on a URI in the e-mail app to view in the browser, 64 // and then pressing back to return to e-mail. 65 static final int PREVIOUS_APP_ADJ = 7; 66 67 // This is a process holding the home application -- we want to try 68 // avoiding killing it, even if it would normally be in the background, 69 // because the user interacts with it so much. 70 static final int HOME_APP_ADJ = 6; 71 72 // This is a process holding an application service -- killing it will not 73 // have much of an impact as far as the user is concerned. 74 static final int SERVICE_ADJ = 5; 75 76 // This is a process with a heavy-weight application. It is in the 77 // background, but we want to try to avoid killing it. Value set in 78 // system/rootdir/init.rc on startup. 79 static final int HEAVY_WEIGHT_APP_ADJ = 4; 80 81 // This is a process currently hosting a backup operation. Killing it 82 // is not entirely fatal but is generally a bad idea. 83 static final int BACKUP_APP_ADJ = 3; 84 85 // This is a process only hosting components that are perceptible to the 86 // user, and we really want to avoid killing them, but they are not 87 // immediately visible. An example is background music playback. 88 static final int PERCEPTIBLE_APP_ADJ = 2; 89 90 // This is a process only hosting activities that are visible to the 91 // user, so we'd prefer they don't disappear. 92 static final int VISIBLE_APP_ADJ = 1; 93 94 // This is the process running the current foreground app. We'd really 95 // rather not kill it! 96 static final int FOREGROUND_APP_ADJ = 0; 97 98 // This is a system persistent process, such as telephony. Definitely 99 // don't want to kill it, but doing so is not completely fatal. 100 static final int PERSISTENT_PROC_ADJ = -12; 101 102 // The system process runs at the default adjustment. 103 static final int SYSTEM_ADJ = -16; 104 105 // Special code for native processes that are not being managed by the system (so 106 // don't have an oom adj assigned by the system). 107 static final int NATIVE_ADJ = -17; 108 109 // Memory pages are 4K. 110 static final int PAGE_SIZE = 4*1024; 111 112 // The minimum number of cached apps we want to be able to keep around, 113 // without empty apps being able to push them out of memory. 114 static final int MIN_CACHED_APPS = 2; 115 116 // The maximum number of cached processes we will keep around before killing them. 117 // NOTE: this constant is *only* a control to not let us go too crazy with 118 // keeping around processes on devices with large amounts of RAM. For devices that 119 // are tighter on RAM, the out of memory killer is responsible for killing background 120 // processes as RAM is needed, and we should *never* be relying on this limit to 121 // kill them. Also note that this limit only applies to cached background processes; 122 // we have no limit on the number of service, visible, foreground, or other such 123 // processes and the number of those processes does not count against the cached 124 // process limit. 125 static final int MAX_CACHED_APPS = 24; 126 127 // We allow empty processes to stick around for at most 30 minutes. 128 static final long MAX_EMPTY_TIME = 30*60*1000; 129 130 // The maximum number of empty app processes we will let sit around. 131 private static final int MAX_EMPTY_APPS = computeEmptyProcessLimit(MAX_CACHED_APPS); 132 133 // The number of empty apps at which we don't consider it necessary to do 134 // memory trimming. 135 static final int TRIM_EMPTY_APPS = MAX_EMPTY_APPS/2; 136 137 // The number of cached at which we don't consider it necessary to do 138 // memory trimming. 139 static final int TRIM_CACHED_APPS = ((MAX_CACHED_APPS-MAX_EMPTY_APPS)*2)/3; 140 141 // Threshold of number of cached+empty where we consider memory critical. 142 static final int TRIM_CRITICAL_THRESHOLD = 3; 143 144 // Threshold of number of cached+empty where we consider memory critical. 145 static final int TRIM_LOW_THRESHOLD = 5; 146 147 // Low Memory Killer Daemon command codes. 148 // These must be kept in sync with the definitions in lmkd.c 149 // 150 // LMK_TARGET <minfree> <minkillprio> ... (up to 6 pairs) 151 // LMK_PROCPRIO <pid> <prio> 152 // LMK_PROCREMOVE <pid> 153 static final byte LMK_TARGET = 0; 154 static final byte LMK_PROCPRIO = 1; 155 static final byte LMK_PROCREMOVE = 2; 156 157 // These are the various interesting memory levels that we will give to 158 // the OOM killer. Note that the OOM killer only supports 6 slots, so we 159 // can't give it a different value for every possible kind of process. 160 private final int[] mOomAdj = new int[] { 161 FOREGROUND_APP_ADJ, VISIBLE_APP_ADJ, PERCEPTIBLE_APP_ADJ, 162 BACKUP_APP_ADJ, CACHED_APP_MIN_ADJ, CACHED_APP_MAX_ADJ 163 }; 164 // These are the low-end OOM level limits. This is appropriate for an 165 // HVGA or smaller phone with less than 512MB. Values are in KB. 166 private final int[] mOomMinFreeLow = new int[] { 167 8192, 12288, 16384, 168 24576, 28672, 32768 169 }; 170 // These are the high-end OOM level limits. This is appropriate for a 171 // 1280x800 or larger screen with around 1GB RAM. Values are in KB. 172 private final int[] mOomMinFreeHigh = new int[] { 173 49152, 61440, 73728, 174 86016, 98304, 122880 175 }; 176 // The actual OOM killer memory levels we are using. 177 private final int[] mOomMinFree = new int[mOomAdj.length]; 178 179 private final long mTotalMemMb; 180 181 private long mCachedRestoreLevel; 182 183 private boolean mHaveDisplaySize; 184 185 private static LocalSocket sLmkdSocket; 186 private static OutputStream sLmkdOutputStream; 187 188 ProcessList() { 189 MemInfoReader minfo = new MemInfoReader(); 190 minfo.readMemInfo(); 191 mTotalMemMb = minfo.getTotalSize()/(1024*1024); 192 updateOomLevels(0, 0, false); 193 } 194 195 void applyDisplaySize(WindowManagerService wm) { 196 if (!mHaveDisplaySize) { 197 Point p = new Point(); 198 wm.getBaseDisplaySize(Display.DEFAULT_DISPLAY, p); 199 if (p.x != 0 && p.y != 0) { 200 updateOomLevels(p.x, p.y, true); 201 mHaveDisplaySize = true; 202 } 203 } 204 } 205 206 private void updateOomLevels(int displayWidth, int displayHeight, boolean write) { 207 // Scale buckets from avail memory: at 300MB we use the lowest values to 208 // 700MB or more for the top values. 209 float scaleMem = ((float)(mTotalMemMb-300))/(700-300); 210 211 // Scale buckets from screen size. 212 int minSize = 480*800; // 384000 213 int maxSize = 1280*800; // 1024000 230400 870400 .264 214 float scaleDisp = ((float)(displayWidth*displayHeight)-minSize)/(maxSize-minSize); 215 if (false) { 216 Slog.i("XXXXXX", "scaleMem=" + scaleMem); 217 Slog.i("XXXXXX", "scaleDisp=" + scaleDisp + " dw=" + displayWidth 218 + " dh=" + displayHeight); 219 } 220 221 float scale = scaleMem > scaleDisp ? scaleMem : scaleDisp; 222 if (scale < 0) scale = 0; 223 else if (scale > 1) scale = 1; 224 int minfree_adj = Resources.getSystem().getInteger( 225 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAdjust); 226 int minfree_abs = Resources.getSystem().getInteger( 227 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAbsolute); 228 if (false) { 229 Slog.i("XXXXXX", "minfree_adj=" + minfree_adj + " minfree_abs=" + minfree_abs); 230 } 231 232 for (int i=0; i<mOomAdj.length; i++) { 233 int low = mOomMinFreeLow[i]; 234 int high = mOomMinFreeHigh[i]; 235 mOomMinFree[i] = (int)(low + ((high-low)*scale)); 236 } 237 238 if (minfree_abs >= 0) { 239 for (int i=0; i<mOomAdj.length; i++) { 240 mOomMinFree[i] = (int)((float)minfree_abs * mOomMinFree[i] / mOomMinFree[mOomAdj.length - 1]); 241 } 242 } 243 244 if (minfree_adj != 0) { 245 for (int i=0; i<mOomAdj.length; i++) { 246 mOomMinFree[i] += (int)((float)minfree_adj * mOomMinFree[i] / mOomMinFree[mOomAdj.length - 1]); 247 if (mOomMinFree[i] < 0) { 248 mOomMinFree[i] = 0; 249 } 250 } 251 } 252 253 // The maximum size we will restore a process from cached to background, when under 254 // memory duress, is 1/3 the size we have reserved for kernel caches and other overhead 255 // before killing background processes. 256 mCachedRestoreLevel = (getMemLevel(ProcessList.CACHED_APP_MAX_ADJ)/1024) / 3; 257 258 // Ask the kernel to try to keep enough memory free to allocate 3 full 259 // screen 32bpp buffers without entering direct reclaim. 260 int reserve = displayWidth * displayHeight * 4 * 3 / 1024; 261 int reserve_adj = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAdjust); 262 int reserve_abs = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAbsolute); 263 264 if (reserve_abs >= 0) { 265 reserve = reserve_abs; 266 } 267 268 if (reserve_adj != 0) { 269 reserve += reserve_adj; 270 if (reserve < 0) { 271 reserve = 0; 272 } 273 } 274 275 if (write) { 276 ByteBuffer buf = ByteBuffer.allocate(4 * (2*mOomAdj.length + 1)); 277 buf.putInt(LMK_TARGET); 278 for (int i=0; i<mOomAdj.length; i++) { 279 buf.putInt((mOomMinFree[i]*1024)/PAGE_SIZE); 280 buf.putInt(mOomAdj[i]); 281 } 282 283 writeLmkd(buf); 284 SystemProperties.set("sys.sysctl.extra_free_kbytes", Integer.toString(reserve)); 285 } 286 // GB: 2048,3072,4096,6144,7168,8192 287 // HC: 8192,10240,12288,14336,16384,20480 288 } 289 290 public static int computeEmptyProcessLimit(int totalProcessLimit) { 291 return (totalProcessLimit*2)/3; 292 } 293 294 private static String buildOomTag(String prefix, String space, int val, int base) { 295 if (val == base) { 296 if (space == null) return prefix; 297 return prefix + " "; 298 } 299 return prefix + "+" + Integer.toString(val-base); 300 } 301 302 public static String makeOomAdjString(int setAdj) { 303 if (setAdj >= ProcessList.CACHED_APP_MIN_ADJ) { 304 return buildOomTag("cch", " ", setAdj, ProcessList.CACHED_APP_MIN_ADJ); 305 } else if (setAdj >= ProcessList.SERVICE_B_ADJ) { 306 return buildOomTag("svcb ", null, setAdj, ProcessList.SERVICE_B_ADJ); 307 } else if (setAdj >= ProcessList.PREVIOUS_APP_ADJ) { 308 return buildOomTag("prev ", null, setAdj, ProcessList.PREVIOUS_APP_ADJ); 309 } else if (setAdj >= ProcessList.HOME_APP_ADJ) { 310 return buildOomTag("home ", null, setAdj, ProcessList.HOME_APP_ADJ); 311 } else if (setAdj >= ProcessList.SERVICE_ADJ) { 312 return buildOomTag("svc ", null, setAdj, ProcessList.SERVICE_ADJ); 313 } else if (setAdj >= ProcessList.HEAVY_WEIGHT_APP_ADJ) { 314 return buildOomTag("hvy ", null, setAdj, ProcessList.HEAVY_WEIGHT_APP_ADJ); 315 } else if (setAdj >= ProcessList.BACKUP_APP_ADJ) { 316 return buildOomTag("bkup ", null, setAdj, ProcessList.BACKUP_APP_ADJ); 317 } else if (setAdj >= ProcessList.PERCEPTIBLE_APP_ADJ) { 318 return buildOomTag("prcp ", null, setAdj, ProcessList.PERCEPTIBLE_APP_ADJ); 319 } else if (setAdj >= ProcessList.VISIBLE_APP_ADJ) { 320 return buildOomTag("vis ", null, setAdj, ProcessList.VISIBLE_APP_ADJ); 321 } else if (setAdj >= ProcessList.FOREGROUND_APP_ADJ) { 322 return buildOomTag("fore ", null, setAdj, ProcessList.FOREGROUND_APP_ADJ); 323 } else if (setAdj >= ProcessList.PERSISTENT_PROC_ADJ) { 324 return buildOomTag("pers ", null, setAdj, ProcessList.PERSISTENT_PROC_ADJ); 325 } else if (setAdj >= ProcessList.SYSTEM_ADJ) { 326 return buildOomTag("sys ", null, setAdj, ProcessList.SYSTEM_ADJ); 327 } else if (setAdj >= ProcessList.NATIVE_ADJ) { 328 return buildOomTag("ntv ", null, setAdj, ProcessList.NATIVE_ADJ); 329 } else { 330 return Integer.toString(setAdj); 331 } 332 } 333 334 public static String makeProcStateString(int curProcState) { 335 String procState; 336 switch (curProcState) { 337 case -1: 338 procState = "N "; 339 break; 340 case ActivityManager.PROCESS_STATE_PERSISTENT: 341 procState = "P "; 342 break; 343 case ActivityManager.PROCESS_STATE_PERSISTENT_UI: 344 procState = "PU"; 345 break; 346 case ActivityManager.PROCESS_STATE_TOP: 347 procState = "T "; 348 break; 349 case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND: 350 procState = "IF"; 351 break; 352 case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND: 353 procState = "IB"; 354 break; 355 case ActivityManager.PROCESS_STATE_BACKUP: 356 procState = "BU"; 357 break; 358 case ActivityManager.PROCESS_STATE_HEAVY_WEIGHT: 359 procState = "HW"; 360 break; 361 case ActivityManager.PROCESS_STATE_SERVICE: 362 procState = "S "; 363 break; 364 case ActivityManager.PROCESS_STATE_RECEIVER: 365 procState = "R "; 366 break; 367 case ActivityManager.PROCESS_STATE_HOME: 368 procState = "HO"; 369 break; 370 case ActivityManager.PROCESS_STATE_LAST_ACTIVITY: 371 procState = "LA"; 372 break; 373 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY: 374 procState = "CA"; 375 break; 376 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT: 377 procState = "Ca"; 378 break; 379 case ActivityManager.PROCESS_STATE_CACHED_EMPTY: 380 procState = "CE"; 381 break; 382 default: 383 procState = "??"; 384 break; 385 } 386 return procState; 387 } 388 389 public static void appendRamKb(StringBuilder sb, long ramKb) { 390 for (int j=0, fact=10; j<6; j++, fact*=10) { 391 if (ramKb < fact) { 392 sb.append(' '); 393 } 394 } 395 sb.append(ramKb); 396 } 397 398 // The minimum amount of time after a state change it is safe ro collect PSS. 399 public static final int PSS_MIN_TIME_FROM_STATE_CHANGE = 15*1000; 400 401 // The maximum amount of time we want to go between PSS collections. 402 public static final int PSS_MAX_INTERVAL = 30*60*1000; 403 404 // The minimum amount of time between successive PSS requests for *all* processes. 405 public static final int PSS_ALL_INTERVAL = 10*60*1000; 406 407 // The minimum amount of time between successive PSS requests for a process. 408 private static final int PSS_SHORT_INTERVAL = 2*60*1000; 409 410 // The amount of time until PSS when a process first becomes top. 411 private static final int PSS_FIRST_TOP_INTERVAL = 10*1000; 412 413 // The amount of time until PSS when a process first goes into the background. 414 private static final int PSS_FIRST_BACKGROUND_INTERVAL = 20*1000; 415 416 // The amount of time until PSS when a process first becomes cached. 417 private static final int PSS_FIRST_CACHED_INTERVAL = 30*1000; 418 419 // The amount of time until PSS when an important process stays in the same state. 420 private static final int PSS_SAME_IMPORTANT_INTERVAL = 15*60*1000; 421 422 // The amount of time until PSS when a service process stays in the same state. 423 private static final int PSS_SAME_SERVICE_INTERVAL = 20*60*1000; 424 425 // The amount of time until PSS when a cached process stays in the same state. 426 private static final int PSS_SAME_CACHED_INTERVAL = 30*60*1000; 427 428 public static final int PROC_MEM_PERSISTENT = 0; 429 public static final int PROC_MEM_TOP = 1; 430 public static final int PROC_MEM_IMPORTANT = 2; 431 public static final int PROC_MEM_SERVICE = 3; 432 public static final int PROC_MEM_CACHED = 4; 433 434 private static final int[] sProcStateToProcMem = new int[] { 435 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT 436 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 437 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP 438 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 439 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 440 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BACKUP 441 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 442 PROC_MEM_SERVICE, // ActivityManager.PROCESS_STATE_SERVICE 443 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_RECEIVER 444 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_HOME 445 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 446 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 447 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 448 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 449 }; 450 451 private static final long[] sFirstAwakePssTimes = new long[] { 452 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 453 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 454 PSS_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 455 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 456 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 457 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 458 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 459 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 460 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 461 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 462 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 463 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 464 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 465 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 466 }; 467 468 private static final long[] sSameAwakePssTimes = new long[] { 469 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 470 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 471 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 472 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 473 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 474 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 475 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 476 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 477 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 478 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 479 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 480 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 481 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 482 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 483 }; 484 485 public static boolean procStatesDifferForMem(int procState1, int procState2) { 486 return sProcStateToProcMem[procState1] != sProcStateToProcMem[procState2]; 487 } 488 489 public static long computeNextPssTime(int procState, boolean first, boolean sleeping, 490 long now) { 491 final long[] table = sleeping 492 ? (first 493 ? sFirstAwakePssTimes 494 : sSameAwakePssTimes) 495 : (first 496 ? sFirstAwakePssTimes 497 : sSameAwakePssTimes); 498 return now + table[procState]; 499 } 500 501 long getMemLevel(int adjustment) { 502 for (int i=0; i<mOomAdj.length; i++) { 503 if (adjustment <= mOomAdj[i]) { 504 return mOomMinFree[i] * 1024; 505 } 506 } 507 return mOomMinFree[mOomAdj.length-1] * 1024; 508 } 509 510 /** 511 * Return the maximum pss size in kb that we consider a process acceptable to 512 * restore from its cached state for running in the background when RAM is low. 513 */ 514 long getCachedRestoreThresholdKb() { 515 return mCachedRestoreLevel; 516 } 517 518 /** 519 * Set the out-of-memory badness adjustment for a process. 520 * 521 * @param pid The process identifier to set. 522 * @param uid The uid of the app 523 * @param amt Adjustment value -- lmkd allows -16 to +15. 524 * 525 * {@hide} 526 */ 527 public static final void setOomAdj(int pid, int uid, int amt) { 528 if (amt == UNKNOWN_ADJ) 529 return; 530 531 ByteBuffer buf = ByteBuffer.allocate(4 * 4); 532 buf.putInt(LMK_PROCPRIO); 533 buf.putInt(pid); 534 buf.putInt(uid); 535 buf.putInt(amt); 536 writeLmkd(buf); 537 } 538 539 /* 540 * {@hide} 541 */ 542 public static final void remove(int pid) { 543 ByteBuffer buf = ByteBuffer.allocate(4 * 2); 544 buf.putInt(LMK_PROCREMOVE); 545 buf.putInt(pid); 546 writeLmkd(buf); 547 } 548 549 private static boolean openLmkdSocket() { 550 try { 551 sLmkdSocket = new LocalSocket(LocalSocket.SOCKET_SEQPACKET); 552 sLmkdSocket.connect( 553 new LocalSocketAddress("lmkd", 554 LocalSocketAddress.Namespace.RESERVED)); 555 sLmkdOutputStream = sLmkdSocket.getOutputStream(); 556 } catch (IOException ex) { 557 Slog.w(ActivityManagerService.TAG, 558 "lowmemorykiller daemon socket open failed"); 559 sLmkdSocket = null; 560 return false; 561 } 562 563 return true; 564 } 565 566 private static void writeLmkd(ByteBuffer buf) { 567 568 for (int i = 0; i < 3; i++) { 569 if (sLmkdSocket == null) { 570 if (openLmkdSocket() == false) { 571 try { 572 Thread.sleep(1000); 573 } catch (InterruptedException ie) { 574 } 575 continue; 576 } 577 } 578 579 try { 580 sLmkdOutputStream.write(buf.array(), 0, buf.position()); 581 return; 582 } catch (IOException ex) { 583 Slog.w(ActivityManagerService.TAG, 584 "Error writing to lowmemorykiller socket"); 585 586 try { 587 sLmkdSocket.close(); 588 } catch (IOException ex2) { 589 } 590 591 sLmkdSocket = null; 592 } 593 } 594 } 595} 596