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 ProcessList()194 ProcessList() { 195 MemInfoReader minfo = new MemInfoReader(); 196 minfo.readMemInfo(); 197 mTotalMemMb = minfo.getTotalSize()/(1024*1024); 198 updateOomLevels(0, 0, false); 199 } 200 applyDisplaySize(WindowManagerService wm)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 updateOomLevels(int displayWidth, int displayHeight, boolean write)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-350))/(700-350); 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 final boolean is64bit = Build.SUPPORTED_64_BIT_ABIS.length > 0; 239 240 for (int i=0; i<mOomAdj.length; i++) { 241 int low = mOomMinFreeLow[i]; 242 int high = mOomMinFreeHigh[i]; 243 if (is64bit) { 244 // Increase the high min-free levels for cached processes for 64-bit 245 if (i == 4) high = (high*3)/2; 246 else if (i == 5) high = (high*7)/4; 247 } 248 mOomMinFree[i] = (int)(low + ((high-low)*scale)); 249 } 250 251 if (minfree_abs >= 0) { 252 for (int i=0; i<mOomAdj.length; i++) { 253 mOomMinFree[i] = (int)((float)minfree_abs * mOomMinFree[i] 254 / mOomMinFree[mOomAdj.length - 1]); 255 } 256 } 257 258 if (minfree_adj != 0) { 259 for (int i=0; i<mOomAdj.length; i++) { 260 mOomMinFree[i] += (int)((float)minfree_adj * mOomMinFree[i] 261 / mOomMinFree[mOomAdj.length - 1]); 262 if (mOomMinFree[i] < 0) { 263 mOomMinFree[i] = 0; 264 } 265 } 266 } 267 268 // The maximum size we will restore a process from cached to background, when under 269 // memory duress, is 1/3 the size we have reserved for kernel caches and other overhead 270 // before killing background processes. 271 mCachedRestoreLevel = (getMemLevel(ProcessList.CACHED_APP_MAX_ADJ)/1024) / 3; 272 273 // Ask the kernel to try to keep enough memory free to allocate 3 full 274 // screen 32bpp buffers without entering direct reclaim. 275 int reserve = displayWidth * displayHeight * 4 * 3 / 1024; 276 int reserve_adj = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAdjust); 277 int reserve_abs = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAbsolute); 278 279 if (reserve_abs >= 0) { 280 reserve = reserve_abs; 281 } 282 283 if (reserve_adj != 0) { 284 reserve += reserve_adj; 285 if (reserve < 0) { 286 reserve = 0; 287 } 288 } 289 290 if (write) { 291 ByteBuffer buf = ByteBuffer.allocate(4 * (2*mOomAdj.length + 1)); 292 buf.putInt(LMK_TARGET); 293 for (int i=0; i<mOomAdj.length; i++) { 294 buf.putInt((mOomMinFree[i]*1024)/PAGE_SIZE); 295 buf.putInt(mOomAdj[i]); 296 } 297 298 writeLmkd(buf); 299 SystemProperties.set("sys.sysctl.extra_free_kbytes", Integer.toString(reserve)); 300 } 301 // GB: 2048,3072,4096,6144,7168,8192 302 // HC: 8192,10240,12288,14336,16384,20480 303 } 304 computeEmptyProcessLimit(int totalProcessLimit)305 public static int computeEmptyProcessLimit(int totalProcessLimit) { 306 return totalProcessLimit/2; 307 } 308 buildOomTag(String prefix, String space, int val, int base)309 private static String buildOomTag(String prefix, String space, int val, int base) { 310 if (val == base) { 311 if (space == null) return prefix; 312 return prefix + " "; 313 } 314 return prefix + "+" + Integer.toString(val-base); 315 } 316 makeOomAdjString(int setAdj)317 public static String makeOomAdjString(int setAdj) { 318 if (setAdj >= ProcessList.CACHED_APP_MIN_ADJ) { 319 return buildOomTag("cch", " ", setAdj, ProcessList.CACHED_APP_MIN_ADJ); 320 } else if (setAdj >= ProcessList.SERVICE_B_ADJ) { 321 return buildOomTag("svcb ", null, setAdj, ProcessList.SERVICE_B_ADJ); 322 } else if (setAdj >= ProcessList.PREVIOUS_APP_ADJ) { 323 return buildOomTag("prev ", null, setAdj, ProcessList.PREVIOUS_APP_ADJ); 324 } else if (setAdj >= ProcessList.HOME_APP_ADJ) { 325 return buildOomTag("home ", null, setAdj, ProcessList.HOME_APP_ADJ); 326 } else if (setAdj >= ProcessList.SERVICE_ADJ) { 327 return buildOomTag("svc ", null, setAdj, ProcessList.SERVICE_ADJ); 328 } else if (setAdj >= ProcessList.HEAVY_WEIGHT_APP_ADJ) { 329 return buildOomTag("hvy ", null, setAdj, ProcessList.HEAVY_WEIGHT_APP_ADJ); 330 } else if (setAdj >= ProcessList.BACKUP_APP_ADJ) { 331 return buildOomTag("bkup ", null, setAdj, ProcessList.BACKUP_APP_ADJ); 332 } else if (setAdj >= ProcessList.PERCEPTIBLE_APP_ADJ) { 333 return buildOomTag("prcp ", null, setAdj, ProcessList.PERCEPTIBLE_APP_ADJ); 334 } else if (setAdj >= ProcessList.VISIBLE_APP_ADJ) { 335 return buildOomTag("vis ", null, setAdj, ProcessList.VISIBLE_APP_ADJ); 336 } else if (setAdj >= ProcessList.FOREGROUND_APP_ADJ) { 337 return buildOomTag("fore ", null, setAdj, ProcessList.FOREGROUND_APP_ADJ); 338 } else if (setAdj >= ProcessList.PERSISTENT_SERVICE_ADJ) { 339 return buildOomTag("psvc ", null, setAdj, ProcessList.PERSISTENT_SERVICE_ADJ); 340 } else if (setAdj >= ProcessList.PERSISTENT_PROC_ADJ) { 341 return buildOomTag("pers ", null, setAdj, ProcessList.PERSISTENT_PROC_ADJ); 342 } else if (setAdj >= ProcessList.SYSTEM_ADJ) { 343 return buildOomTag("sys ", null, setAdj, ProcessList.SYSTEM_ADJ); 344 } else if (setAdj >= ProcessList.NATIVE_ADJ) { 345 return buildOomTag("ntv ", null, setAdj, ProcessList.NATIVE_ADJ); 346 } else { 347 return Integer.toString(setAdj); 348 } 349 } 350 makeProcStateString(int curProcState)351 public static String makeProcStateString(int curProcState) { 352 String procState; 353 switch (curProcState) { 354 case -1: 355 procState = "N "; 356 break; 357 case ActivityManager.PROCESS_STATE_PERSISTENT: 358 procState = "P "; 359 break; 360 case ActivityManager.PROCESS_STATE_PERSISTENT_UI: 361 procState = "PU"; 362 break; 363 case ActivityManager.PROCESS_STATE_TOP: 364 procState = "T "; 365 break; 366 case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND: 367 procState = "IF"; 368 break; 369 case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND: 370 procState = "IB"; 371 break; 372 case ActivityManager.PROCESS_STATE_BACKUP: 373 procState = "BU"; 374 break; 375 case ActivityManager.PROCESS_STATE_HEAVY_WEIGHT: 376 procState = "HW"; 377 break; 378 case ActivityManager.PROCESS_STATE_SERVICE: 379 procState = "S "; 380 break; 381 case ActivityManager.PROCESS_STATE_RECEIVER: 382 procState = "R "; 383 break; 384 case ActivityManager.PROCESS_STATE_HOME: 385 procState = "HO"; 386 break; 387 case ActivityManager.PROCESS_STATE_LAST_ACTIVITY: 388 procState = "LA"; 389 break; 390 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY: 391 procState = "CA"; 392 break; 393 case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT: 394 procState = "Ca"; 395 break; 396 case ActivityManager.PROCESS_STATE_CACHED_EMPTY: 397 procState = "CE"; 398 break; 399 default: 400 procState = "??"; 401 break; 402 } 403 return procState; 404 } 405 appendRamKb(StringBuilder sb, long ramKb)406 public static void appendRamKb(StringBuilder sb, long ramKb) { 407 for (int j=0, fact=10; j<6; j++, fact*=10) { 408 if (ramKb < fact) { 409 sb.append(' '); 410 } 411 } 412 sb.append(ramKb); 413 } 414 415 // How long after a state change that it is safe to collect PSS without it being dirty. 416 public static final int PSS_SAFE_TIME_FROM_STATE_CHANGE = 1000; 417 418 // The minimum time interval after a state change it is safe to collect PSS. 419 public static final int PSS_MIN_TIME_FROM_STATE_CHANGE = 15*1000; 420 421 // The maximum amount of time we want to go between PSS collections. 422 public static final int PSS_MAX_INTERVAL = 30*60*1000; 423 424 // The minimum amount of time between successive PSS requests for *all* processes. 425 public static final int PSS_ALL_INTERVAL = 10*60*1000; 426 427 // The minimum amount of time between successive PSS requests for a process. 428 private static final int PSS_SHORT_INTERVAL = 2*60*1000; 429 430 // The amount of time until PSS when a process first becomes top. 431 private static final int PSS_FIRST_TOP_INTERVAL = 10*1000; 432 433 // The amount of time until PSS when a process first goes into the background. 434 private static final int PSS_FIRST_BACKGROUND_INTERVAL = 20*1000; 435 436 // The amount of time until PSS when a process first becomes cached. 437 private static final int PSS_FIRST_CACHED_INTERVAL = 30*1000; 438 439 // The amount of time until PSS when an important process stays in the same state. 440 private static final int PSS_SAME_IMPORTANT_INTERVAL = 15*60*1000; 441 442 // The amount of time until PSS when a service process stays in the same state. 443 private static final int PSS_SAME_SERVICE_INTERVAL = 20*60*1000; 444 445 // The amount of time until PSS when a cached process stays in the same state. 446 private static final int PSS_SAME_CACHED_INTERVAL = 30*60*1000; 447 448 // The minimum time interval after a state change it is safe to collect PSS. 449 public static final int PSS_TEST_MIN_TIME_FROM_STATE_CHANGE = 10*1000; 450 451 // The amount of time during testing until PSS when a process first becomes top. 452 private static final int PSS_TEST_FIRST_TOP_INTERVAL = 3*1000; 453 454 // The amount of time during testing until PSS when a process first goes into the background. 455 private static final int PSS_TEST_FIRST_BACKGROUND_INTERVAL = 5*1000; 456 457 // The amount of time during testing until PSS when an important process stays in same state. 458 private static final int PSS_TEST_SAME_IMPORTANT_INTERVAL = 10*1000; 459 460 // The amount of time during testing until PSS when a background process stays in same state. 461 private static final int PSS_TEST_SAME_BACKGROUND_INTERVAL = 15*1000; 462 463 public static final int PROC_MEM_PERSISTENT = 0; 464 public static final int PROC_MEM_TOP = 1; 465 public static final int PROC_MEM_IMPORTANT = 2; 466 public static final int PROC_MEM_SERVICE = 3; 467 public static final int PROC_MEM_CACHED = 4; 468 469 private static final int[] sProcStateToProcMem = new int[] { 470 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT 471 PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 472 PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP 473 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 474 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 475 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BACKUP 476 PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 477 PROC_MEM_SERVICE, // ActivityManager.PROCESS_STATE_SERVICE 478 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_RECEIVER 479 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_HOME 480 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 481 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 482 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 483 PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 484 }; 485 486 private static final long[] sFirstAwakePssTimes = new long[] { 487 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 488 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 489 PSS_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 490 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 491 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 492 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 493 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 494 PSS_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 495 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 496 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 497 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 498 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 499 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 500 PSS_FIRST_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 501 }; 502 503 private static final long[] sSameAwakePssTimes = new long[] { 504 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 505 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 506 PSS_SHORT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 507 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 508 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 509 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 510 PSS_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 511 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 512 PSS_SAME_SERVICE_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 513 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 514 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 515 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 516 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 517 PSS_SAME_CACHED_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 518 }; 519 520 private static final long[] sTestFirstAwakePssTimes = new long[] { 521 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 522 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 523 PSS_TEST_FIRST_TOP_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 524 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 525 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 526 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 527 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 528 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 529 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 530 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 531 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 532 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 533 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 534 PSS_TEST_FIRST_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 535 }; 536 537 private static final long[] sTestSameAwakePssTimes = new long[] { 538 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT 539 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_PERSISTENT_UI 540 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_TOP 541 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND 542 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND 543 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_BACKUP 544 PSS_TEST_SAME_IMPORTANT_INTERVAL, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT 545 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_SERVICE 546 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_RECEIVER 547 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_HOME 548 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY 549 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY 550 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT 551 PSS_TEST_SAME_BACKGROUND_INTERVAL, // ActivityManager.PROCESS_STATE_CACHED_EMPTY 552 }; 553 procStatesDifferForMem(int procState1, int procState2)554 public static boolean procStatesDifferForMem(int procState1, int procState2) { 555 return sProcStateToProcMem[procState1] != sProcStateToProcMem[procState2]; 556 } 557 minTimeFromStateChange(boolean test)558 public static long minTimeFromStateChange(boolean test) { 559 return test ? PSS_TEST_MIN_TIME_FROM_STATE_CHANGE : PSS_MIN_TIME_FROM_STATE_CHANGE; 560 } 561 computeNextPssTime(int procState, boolean first, boolean test, boolean sleeping, long now)562 public static long computeNextPssTime(int procState, boolean first, boolean test, 563 boolean sleeping, long now) { 564 final long[] table = test 565 ? (first 566 ? sTestFirstAwakePssTimes 567 : sTestSameAwakePssTimes) 568 : (first 569 ? sFirstAwakePssTimes 570 : sSameAwakePssTimes); 571 return now + table[procState]; 572 } 573 getMemLevel(int adjustment)574 long getMemLevel(int adjustment) { 575 for (int i=0; i<mOomAdj.length; i++) { 576 if (adjustment <= mOomAdj[i]) { 577 return mOomMinFree[i] * 1024; 578 } 579 } 580 return mOomMinFree[mOomAdj.length-1] * 1024; 581 } 582 583 /** 584 * Return the maximum pss size in kb that we consider a process acceptable to 585 * restore from its cached state for running in the background when RAM is low. 586 */ getCachedRestoreThresholdKb()587 long getCachedRestoreThresholdKb() { 588 return mCachedRestoreLevel; 589 } 590 591 /** 592 * Set the out-of-memory badness adjustment for a process. 593 * 594 * @param pid The process identifier to set. 595 * @param uid The uid of the app 596 * @param amt Adjustment value -- lmkd allows -16 to +15. 597 * 598 * {@hide} 599 */ setOomAdj(int pid, int uid, int amt)600 public static final void setOomAdj(int pid, int uid, int amt) { 601 if (amt == UNKNOWN_ADJ) 602 return; 603 604 long start = SystemClock.elapsedRealtime(); 605 ByteBuffer buf = ByteBuffer.allocate(4 * 4); 606 buf.putInt(LMK_PROCPRIO); 607 buf.putInt(pid); 608 buf.putInt(uid); 609 buf.putInt(amt); 610 writeLmkd(buf); 611 long now = SystemClock.elapsedRealtime(); 612 if ((now-start) > 250) { 613 Slog.w("ActivityManager", "SLOW OOM ADJ: " + (now-start) + "ms for pid " + pid 614 + " = " + amt); 615 } 616 } 617 618 /* 619 * {@hide} 620 */ remove(int pid)621 public static final void remove(int pid) { 622 ByteBuffer buf = ByteBuffer.allocate(4 * 2); 623 buf.putInt(LMK_PROCREMOVE); 624 buf.putInt(pid); 625 writeLmkd(buf); 626 } 627 openLmkdSocket()628 private static boolean openLmkdSocket() { 629 try { 630 sLmkdSocket = new LocalSocket(LocalSocket.SOCKET_SEQPACKET); 631 sLmkdSocket.connect( 632 new LocalSocketAddress("lmkd", 633 LocalSocketAddress.Namespace.RESERVED)); 634 sLmkdOutputStream = sLmkdSocket.getOutputStream(); 635 } catch (IOException ex) { 636 Slog.w(ActivityManagerService.TAG, 637 "lowmemorykiller daemon socket open failed"); 638 sLmkdSocket = null; 639 return false; 640 } 641 642 return true; 643 } 644 writeLmkd(ByteBuffer buf)645 private static void writeLmkd(ByteBuffer buf) { 646 647 for (int i = 0; i < 3; i++) { 648 if (sLmkdSocket == null) { 649 if (openLmkdSocket() == false) { 650 try { 651 Thread.sleep(1000); 652 } catch (InterruptedException ie) { 653 } 654 continue; 655 } 656 } 657 658 try { 659 sLmkdOutputStream.write(buf.array(), 0, buf.position()); 660 return; 661 } catch (IOException ex) { 662 Slog.w(ActivityManagerService.TAG, 663 "Error writing to lowmemorykiller socket"); 664 665 try { 666 sLmkdSocket.close(); 667 } catch (IOException ex2) { 668 } 669 670 sLmkdSocket = null; 671 } 672 } 673 } 674 } 675