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 // Adjustment used in certain places where we don't know it yet. 53 // (Generally this is something that is going to be cached, but we 54 // don't know the exact value in the cached range to assign yet.) 55 static final int UNKNOWN_ADJ = 16; 56 57 // This is a process only hosting activities that are not visible, 58 // so it can be killed without any disruption. 59 static final int CACHED_APP_MAX_ADJ = 15; 60 static final int CACHED_APP_MIN_ADJ = 9; 61 62 // The B list of SERVICE_ADJ -- these are the old and decrepit 63 // services that aren't as shiny and interesting as the ones in the A list. 64 static final int SERVICE_B_ADJ = 8; 65 66 // This is the process of the previous application that the user was in. 67 // This process is kept above other things, because it is very common to 68 // switch back to the previous app. This is important both for recent 69 // task switch (toggling between the two top recent apps) as well as normal 70 // UI flow such as clicking on a URI in the e-mail app to view in the browser, 71 // and then pressing back to return to e-mail. 72 static final int PREVIOUS_APP_ADJ = 7; 73 74 // This is a process holding the home application -- we want to try 75 // avoiding killing it, even if it would normally be in the background, 76 // because the user interacts with it so much. 77 static final int HOME_APP_ADJ = 6; 78 79 // This is a process holding an application service -- killing it will not 80 // have much of an impact as far as the user is concerned. 81 static final int SERVICE_ADJ = 5; 82 83 // This is a process with a heavy-weight application. It is in the 84 // background, but we want to try to avoid killing it. Value set in 85 // system/rootdir/init.rc on startup. 86 static final int HEAVY_WEIGHT_APP_ADJ = 4; 87 88 // This is a process currently hosting a backup operation. Killing it 89 // is not entirely fatal but is generally a bad idea. 90 static final int BACKUP_APP_ADJ = 3; 91 92 // This is a process only hosting components that are perceptible to the 93 // user, and we really want to avoid killing them, but they are not 94 // immediately visible. An example is background music playback. 95 static final int PERCEPTIBLE_APP_ADJ = 2; 96 97 // This is a process only hosting activities that are visible to the 98 // user, so we'd prefer they don't disappear. 99 static final int VISIBLE_APP_ADJ = 1; 100 101 // This is the process running the current foreground app. We'd really 102 // rather not kill it! 103 static final int FOREGROUND_APP_ADJ = 0; 104 105 // This is a process that the system or a persistent process has bound to, 106 // and indicated it is important. 107 static final int PERSISTENT_SERVICE_ADJ = -11; 108 109 // This is a system persistent process, such as telephony. Definitely 110 // don't want to kill it, but doing so is not completely fatal. 111 static final int PERSISTENT_PROC_ADJ = -12; 112 113 // The system process runs at the default adjustment. 114 static final int SYSTEM_ADJ = -16; 115 116 // Special code for native processes that are not being managed by the system (so 117 // don't have an oom adj assigned by the system). 118 static final int NATIVE_ADJ = -17; 119 120 // Memory pages are 4K. 121 static final int PAGE_SIZE = 4*1024; 122 123 // The minimum number of cached apps we want to be able to keep around, 124 // without empty apps being able to push them out of memory. 125 static final int MIN_CACHED_APPS = 2; 126 127 // The maximum number of cached processes we will keep around before killing them. 128 // NOTE: this constant is *only* a control to not let us go too crazy with 129 // keeping around processes on devices with large amounts of RAM. For devices that 130 // are tighter on RAM, the out of memory killer is responsible for killing background 131 // processes as RAM is needed, and we should *never* be relying on this limit to 132 // kill them. Also note that this limit only applies to cached background processes; 133 // we have no limit on the number of service, visible, foreground, or other such 134 // processes and the number of those processes does not count against the cached 135 // process limit. 136 static final int MAX_CACHED_APPS = 32; 137 138 // We allow empty processes to stick around for at most 30 minutes. 139 static final long MAX_EMPTY_TIME = 30*60*1000; 140 141 // The maximum number of empty app processes we will let sit around. 142 private static final int MAX_EMPTY_APPS = computeEmptyProcessLimit(MAX_CACHED_APPS); 143 144 // The number of empty apps at which we don't consider it necessary to do 145 // memory trimming. 146 static final int TRIM_EMPTY_APPS = MAX_EMPTY_APPS/2; 147 148 // The number of cached at which we don't consider it necessary to do 149 // memory trimming. 150 static final int TRIM_CACHED_APPS = (MAX_CACHED_APPS-MAX_EMPTY_APPS)/3; 151 152 // Threshold of number of cached+empty where we consider memory critical. 153 static final int TRIM_CRITICAL_THRESHOLD = 3; 154 155 // Threshold of number of cached+empty where we consider memory critical. 156 static final int TRIM_LOW_THRESHOLD = 5; 157 158 // Low Memory Killer Daemon command codes. 159 // These must be kept in sync with the definitions in lmkd.c 160 // 161 // LMK_TARGET <minfree> <minkillprio> ... (up to 6 pairs) 162 // LMK_PROCPRIO <pid> <prio> 163 // LMK_PROCREMOVE <pid> 164 static final byte LMK_TARGET = 0; 165 static final byte LMK_PROCPRIO = 1; 166 static final byte LMK_PROCREMOVE = 2; 167 168 // These are the various interesting memory levels that we will give to 169 // the OOM killer. Note that the OOM killer only supports 6 slots, so we 170 // can't give it a different value for every possible kind of process. 171 private final int[] mOomAdj = new int[] { 172 FOREGROUND_APP_ADJ, VISIBLE_APP_ADJ, PERCEPTIBLE_APP_ADJ, 173 BACKUP_APP_ADJ, CACHED_APP_MIN_ADJ, CACHED_APP_MAX_ADJ 174 }; 175 // These are the low-end OOM level limits. This is appropriate for an 176 // HVGA or smaller phone with less than 512MB. Values are in KB. 177 private final int[] mOomMinFreeLow = new int[] { 178 12288, 18432, 24576, 179 36864, 43008, 49152 180 }; 181 // These are the high-end OOM level limits. This is appropriate for a 182 // 1280x800 or larger screen with around 1GB RAM. Values are in KB. 183 private final int[] mOomMinFreeHigh = new int[] { 184 73728, 92160, 110592, 185 129024, 147456, 184320 186 }; 187 // The actual OOM killer memory levels we are using. 188 private final int[] mOomMinFree = new int[mOomAdj.length]; 189 190 private final long mTotalMemMb; 191 192 private long mCachedRestoreLevel; 193 194 private boolean mHaveDisplaySize; 195 196 private static LocalSocket sLmkdSocket; 197 private static OutputStream sLmkdOutputStream; 198 ProcessList()199 ProcessList() { 200 MemInfoReader minfo = new MemInfoReader(); 201 minfo.readMemInfo(); 202 mTotalMemMb = minfo.getTotalSize()/(1024*1024); 203 updateOomLevels(0, 0, false); 204 } 205 applyDisplaySize(WindowManagerService wm)206 void applyDisplaySize(WindowManagerService wm) { 207 if (!mHaveDisplaySize) { 208 Point p = new Point(); 209 wm.getBaseDisplaySize(Display.DEFAULT_DISPLAY, p); 210 if (p.x != 0 && p.y != 0) { 211 updateOomLevels(p.x, p.y, true); 212 mHaveDisplaySize = true; 213 } 214 } 215 } 216 updateOomLevels(int displayWidth, int displayHeight, boolean write)217 private void updateOomLevels(int displayWidth, int displayHeight, boolean write) { 218 // Scale buckets from avail memory: at 300MB we use the lowest values to 219 // 700MB or more for the top values. 220 float scaleMem = ((float)(mTotalMemMb-350))/(700-350); 221 222 // Scale buckets from screen size. 223 int minSize = 480*800; // 384000 224 int maxSize = 1280*800; // 1024000 230400 870400 .264 225 float scaleDisp = ((float)(displayWidth*displayHeight)-minSize)/(maxSize-minSize); 226 if (false) { 227 Slog.i("XXXXXX", "scaleMem=" + scaleMem); 228 Slog.i("XXXXXX", "scaleDisp=" + scaleDisp + " dw=" + displayWidth 229 + " dh=" + displayHeight); 230 } 231 232 float scale = scaleMem > scaleDisp ? scaleMem : scaleDisp; 233 if (scale < 0) scale = 0; 234 else if (scale > 1) scale = 1; 235 int minfree_adj = Resources.getSystem().getInteger( 236 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAdjust); 237 int minfree_abs = Resources.getSystem().getInteger( 238 com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAbsolute); 239 if (false) { 240 Slog.i("XXXXXX", "minfree_adj=" + minfree_adj + " minfree_abs=" + minfree_abs); 241 } 242 243 final boolean is64bit = Build.SUPPORTED_64_BIT_ABIS.length > 0; 244 245 for (int i=0; i<mOomAdj.length; i++) { 246 int low = mOomMinFreeLow[i]; 247 int high = mOomMinFreeHigh[i]; 248 if (is64bit) { 249 // Increase the high min-free levels for cached processes for 64-bit 250 if (i == 4) high = (high*3)/2; 251 else if (i == 5) high = (high*7)/4; 252 } 253 mOomMinFree[i] = (int)(low + ((high-low)*scale)); 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 computeEmptyProcessLimit(int totalProcessLimit)310 public static int computeEmptyProcessLimit(int totalProcessLimit) { 311 return totalProcessLimit/2; 312 } 313 buildOomTag(String prefix, String space, int val, int base)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 makeOomAdjString(int setAdj)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 makeProcStateString(int curProcState)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_BOUND_FOREGROUND_SERVICE: 372 procState = "SB"; 373 break; 374 case ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE: 375 procState = "SF"; 376 break; 377 case ActivityManager.PROCESS_STATE_TOP_SLEEPING: 378 procState = "TS"; 379 break; 380 case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND: 381 procState = "IF"; 382 break; 383 case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND: 384 procState = "IB"; 385 break; 386 case ActivityManager.PROCESS_STATE_BACKUP: 387 procState = "BU"; 388 break; 389 case ActivityManager.PROCESS_STATE_HEAVY_WEIGHT: 390 procState = "HW"; 391 break; 392 case ActivityManager.PROCESS_STATE_SERVICE: 393 procState = "S "; 394 break; 395 case ActivityManager.PROCESS_STATE_RECEIVER: 396 procState = "R "; 397 break; 398 case ActivityManager.PROCESS_STATE_HOME: 399 procState = "HO"; 400 break; 401 case ActivityManager.PROCESS_STATE_LAST_ACTIVITY: 402 procState = "LA"; 403 break; 404 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY: 405 procState = "CA"; 406 break; 407 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT: 408 procState = "Ca"; 409 break; 410 case ActivityManager.PROCESS_STATE_CACHED_EMPTY: 411 procState = "CE"; 412 break; 413 default: 414 procState = "??"; 415 break; 416 } 417 return procState; 418 } 419 appendRamKb(StringBuilder sb, long ramKb)420 public static void appendRamKb(StringBuilder sb, long ramKb) { 421 for (int j=0, fact=10; j<6; j++, fact*=10) { 422 if (ramKb < fact) { 423 sb.append(' '); 424 } 425 } 426 sb.append(ramKb); 427 } 428 429 // How long after a state change that it is safe to collect PSS without it being dirty. 430 public static final int PSS_SAFE_TIME_FROM_STATE_CHANGE = 1000; 431 432 // The minimum time interval after a state change it is safe to collect PSS. 433 public static final int PSS_MIN_TIME_FROM_STATE_CHANGE = 15*1000; 434 435 // The maximum amount of time we want to go between PSS collections. 436 public static final int PSS_MAX_INTERVAL = 30*60*1000; 437 438 // The minimum amount of time between successive PSS requests for *all* processes. 439 public static final int PSS_ALL_INTERVAL = 10*60*1000; 440 441 // The minimum amount of time between successive PSS requests for a process. 442 private static final int PSS_SHORT_INTERVAL = 2*60*1000; 443 444 // The amount of time until PSS when a process first becomes top. 445 private static final int PSS_FIRST_TOP_INTERVAL = 10*1000; 446 447 // The amount of time until PSS when a process first goes into the background. 448 private static final int PSS_FIRST_BACKGROUND_INTERVAL = 20*1000; 449 450 // The amount of time until PSS when a process first becomes cached. 451 private static final int PSS_FIRST_CACHED_INTERVAL = 30*1000; 452 453 // The amount of time until PSS when an important process stays in the same state. 454 private static final int PSS_SAME_IMPORTANT_INTERVAL = 15*60*1000; 455 456 // The amount of time until PSS when a service process stays in the same state. 457 private static final int PSS_SAME_SERVICE_INTERVAL = 20*60*1000; 458 459 // The amount of time until PSS when a cached process stays in the same state. 460 private static final int PSS_SAME_CACHED_INTERVAL = 30*60*1000; 461 462 // The minimum time interval after a state change it is safe to collect PSS. 463 public static final int PSS_TEST_MIN_TIME_FROM_STATE_CHANGE = 10*1000; 464 465 // The amount of time during testing until PSS when a process first becomes top. 466 private static final int PSS_TEST_FIRST_TOP_INTERVAL = 3*1000; 467 468 // The amount of time during testing until PSS when a process first goes into the background. 469 private static final int PSS_TEST_FIRST_BACKGROUND_INTERVAL = 5*1000; 470 471 // The amount of time during testing until PSS when an important process stays in same state. 472 private static final int PSS_TEST_SAME_IMPORTANT_INTERVAL = 10*1000; 473 474 // The amount of time during testing until PSS when a background process stays in same state. 475 private static final int PSS_TEST_SAME_BACKGROUND_INTERVAL = 15*1000; 476 477 public static final int PROC_MEM_PERSISTENT = 0; 478 public static final int PROC_MEM_TOP = 1; 479 public static final int PROC_MEM_IMPORTANT = 2; 480 public static final int PROC_MEM_SERVICE = 3; 481 public static final int PROC_MEM_CACHED = 4; 482 483 private static final int[] sProcStateToProcMem = new int[] { 484 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT 485 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 486 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP 487 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 488 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 489 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 490 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 491 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 492 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BACKUP 493 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 494 PROC_MEM_SERVICE, // ActivityManager.PROCESS_STATE_SERVICE 495 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_RECEIVER 496 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_HOME 497 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 498 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 499 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 500 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 501 }; 502 503 private static final long[] sFirstAwakePssTimes = new long[] { 504 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 505 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 506 PSS_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 507 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 508 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 509 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 510 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 511 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 512 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 513 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 514 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 515 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 516 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 517 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 518 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 519 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 520 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 521 }; 522 523 private static final long[] sSameAwakePssTimes = new long[] { 524 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 525 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 526 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 527 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 528 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 529 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 530 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 531 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 532 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 533 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 534 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 535 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 536 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 537 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 538 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 539 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 540 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 541 }; 542 543 private static final long[] sTestFirstAwakePssTimes = new long[] { 544 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 545 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 546 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 547 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 548 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 549 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 550 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 551 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 552 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 553 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 554 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 555 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 556 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 557 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 558 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 559 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 560 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 561 }; 562 563 private static final long[] sTestSameAwakePssTimes = new long[] { 564 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 565 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 566 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 567 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE 568 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE 569 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP_SLEEPING 570 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 571 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 572 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 573 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 574 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 575 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 576 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 577 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 578 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 579 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 580 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 581 }; 582 procStatesDifferForMem(int procState1, int procState2)583 public static boolean procStatesDifferForMem(int procState1, int procState2) { 584 return sProcStateToProcMem[procState1] != sProcStateToProcMem[procState2]; 585 } 586 minTimeFromStateChange(boolean test)587 public static long minTimeFromStateChange(boolean test) { 588 return test ? PSS_TEST_MIN_TIME_FROM_STATE_CHANGE : PSS_MIN_TIME_FROM_STATE_CHANGE; 589 } 590 computeNextPssTime(int procState, boolean first, boolean test, boolean sleeping, long now)591 public static long computeNextPssTime(int procState, boolean first, boolean test, 592 boolean sleeping, long now) { 593 final long[] table = test 594 ? (first 595 ? sTestFirstAwakePssTimes 596 : sTestSameAwakePssTimes) 597 : (first 598 ? sFirstAwakePssTimes 599 : sSameAwakePssTimes); 600 return now + table[procState]; 601 } 602 getMemLevel(int adjustment)603 long getMemLevel(int adjustment) { 604 for (int i=0; i<mOomAdj.length; i++) { 605 if (adjustment <= mOomAdj[i]) { 606 return mOomMinFree[i] * 1024; 607 } 608 } 609 return mOomMinFree[mOomAdj.length-1] * 1024; 610 } 611 612 /** 613 * Return the maximum pss size in kb that we consider a process acceptable to 614 * restore from its cached state for running in the background when RAM is low. 615 */ getCachedRestoreThresholdKb()616 long getCachedRestoreThresholdKb() { 617 return mCachedRestoreLevel; 618 } 619 620 /** 621 * Set the out-of-memory badness adjustment for a process. 622 * 623 * @param pid The process identifier to set. 624 * @param uid The uid of the app 625 * @param amt Adjustment value -- lmkd allows -16 to +15. 626 * 627 * {@hide} 628 */ setOomAdj(int pid, int uid, int amt)629 public static final void setOomAdj(int pid, int uid, int amt) { 630 if (amt == UNKNOWN_ADJ) 631 return; 632 633 long start = SystemClock.elapsedRealtime(); 634 ByteBuffer buf = ByteBuffer.allocate(4 * 4); 635 buf.putInt(LMK_PROCPRIO); 636 buf.putInt(pid); 637 buf.putInt(uid); 638 buf.putInt(amt); 639 writeLmkd(buf); 640 long now = SystemClock.elapsedRealtime(); 641 if ((now-start) > 250) { 642 Slog.w("ActivityManager", "SLOW OOM ADJ: " + (now-start) + "ms for pid " + pid 643 + " = " + amt); 644 } 645 } 646 647 /* 648 * {@hide} 649 */ remove(int pid)650 public static final void remove(int pid) { 651 ByteBuffer buf = ByteBuffer.allocate(4 * 2); 652 buf.putInt(LMK_PROCREMOVE); 653 buf.putInt(pid); 654 writeLmkd(buf); 655 } 656 openLmkdSocket()657 private static boolean openLmkdSocket() { 658 try { 659 sLmkdSocket = new LocalSocket(LocalSocket.SOCKET_SEQPACKET); 660 sLmkdSocket.connect( 661 new LocalSocketAddress("lmkd", 662 LocalSocketAddress.Namespace.RESERVED)); 663 sLmkdOutputStream = sLmkdSocket.getOutputStream(); 664 } catch (IOException ex) { 665 Slog.w(TAG, "lowmemorykiller daemon socket open failed"); 666 sLmkdSocket = null; 667 return false; 668 } 669 670 return true; 671 } 672 writeLmkd(ByteBuffer buf)673 private static void writeLmkd(ByteBuffer buf) { 674 675 for (int i = 0; i < 3; i++) { 676 if (sLmkdSocket == null) { 677 if (openLmkdSocket() == false) { 678 try { 679 Thread.sleep(1000); 680 } catch (InterruptedException ie) { 681 } 682 continue; 683 } 684 } 685 686 try { 687 sLmkdOutputStream.write(buf.array(), 0, buf.position()); 688 return; 689 } catch (IOException ex) { 690 Slog.w(TAG, "Error writing to lowmemorykiller socket"); 691 692 try { 693 sLmkdSocket.close(); 694 } catch (IOException ex2) { 695 } 696 697 sLmkdSocket = null; 698 } 699 } 700 } 701 } 702