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.FileOutputStream; 20 import java.io.IOException; 21 22 import com.android.internal.util.MemInfoReader; 23 import com.android.server.wm.WindowManagerService; 24 25 import android.graphics.Point; 26 import android.util.Slog; 27 28 /** 29 * Activity manager code dealing with processes. 30 */ 31 class ProcessList { 32 // The minimum time we allow between crashes, for us to consider this 33 // application to be bad and stop and its services and reject broadcasts. 34 static final int MIN_CRASH_INTERVAL = 60*1000; 35 36 // OOM adjustments for processes in various states: 37 38 // This is a process only hosting activities that are not visible, 39 // so it can be killed without any disruption. 40 static final int HIDDEN_APP_MAX_ADJ = 15; 41 static int HIDDEN_APP_MIN_ADJ = 9; 42 43 // The B list of SERVICE_ADJ -- these are the old and decrepit 44 // services that aren't as shiny and interesting as the ones in the A list. 45 static final int SERVICE_B_ADJ = 8; 46 47 // This is the process of the previous application that the user was in. 48 // This process is kept above other things, because it is very common to 49 // switch back to the previous app. This is important both for recent 50 // task switch (toggling between the two top recent apps) as well as normal 51 // UI flow such as clicking on a URI in the e-mail app to view in the browser, 52 // and then pressing back to return to e-mail. 53 static final int PREVIOUS_APP_ADJ = 7; 54 55 // This is a process holding the home application -- we want to try 56 // avoiding killing it, even if it would normally be in the background, 57 // because the user interacts with it so much. 58 static final int HOME_APP_ADJ = 6; 59 60 // This is a process holding an application service -- killing it will not 61 // have much of an impact as far as the user is concerned. 62 static final int SERVICE_ADJ = 5; 63 64 // This is a process currently hosting a backup operation. Killing it 65 // is not entirely fatal but is generally a bad idea. 66 static final int BACKUP_APP_ADJ = 4; 67 68 // This is a process with a heavy-weight application. It is in the 69 // background, but we want to try to avoid killing it. Value set in 70 // system/rootdir/init.rc on startup. 71 static final int HEAVY_WEIGHT_APP_ADJ = 3; 72 73 // This is a process only hosting components that are perceptible to the 74 // user, and we really want to avoid killing them, but they are not 75 // immediately visible. An example is background music playback. 76 static final int PERCEPTIBLE_APP_ADJ = 2; 77 78 // This is a process only hosting activities that are visible to the 79 // user, so we'd prefer they don't disappear. 80 static final int VISIBLE_APP_ADJ = 1; 81 82 // This is the process running the current foreground app. We'd really 83 // rather not kill it! 84 static final int FOREGROUND_APP_ADJ = 0; 85 86 // This is a system persistent process, such as telephony. Definitely 87 // don't want to kill it, but doing so is not completely fatal. 88 static final int PERSISTENT_PROC_ADJ = -12; 89 90 // The system process runs at the default adjustment. 91 static final int SYSTEM_ADJ = -16; 92 93 // Memory pages are 4K. 94 static final int PAGE_SIZE = 4*1024; 95 96 // The minimum number of hidden apps we want to be able to keep around, 97 // without empty apps being able to push them out of memory. 98 static final int MIN_HIDDEN_APPS = 2; 99 100 // The maximum number of hidden processes we will keep around before 101 // killing them; this is just a control to not let us go too crazy with 102 // keeping around processes on devices with large amounts of RAM. 103 static final int MAX_HIDDEN_APPS = 15; 104 105 // We put empty content processes after any hidden processes that have 106 // been idle for less than 15 seconds. 107 static final long CONTENT_APP_IDLE_OFFSET = 15*1000; 108 109 // We put empty content processes after any hidden processes that have 110 // been idle for less than 120 seconds. 111 static final long EMPTY_APP_IDLE_OFFSET = 120*1000; 112 113 // These are the various interesting memory levels that we will give to 114 // the OOM killer. Note that the OOM killer only supports 6 slots, so we 115 // can't give it a different value for every possible kind of process. 116 private final int[] mOomAdj = new int[] { 117 FOREGROUND_APP_ADJ, VISIBLE_APP_ADJ, PERCEPTIBLE_APP_ADJ, 118 BACKUP_APP_ADJ, HIDDEN_APP_MIN_ADJ, HIDDEN_APP_MAX_ADJ 119 }; 120 // These are the low-end OOM level limits. This is appropriate for an 121 // HVGA or smaller phone with less than 512MB. Values are in KB. 122 private final long[] mOomMinFreeLow = new long[] { 123 8192, 12288, 16384, 124 24576, 28672, 32768 125 }; 126 // These are the high-end OOM level limits. This is appropriate for a 127 // 1280x800 or larger screen with around 1GB RAM. Values are in KB. 128 private final long[] mOomMinFreeHigh = new long[] { 129 32768, 40960, 49152, 130 57344, 65536, 81920 131 }; 132 // The actual OOM killer memory levels we are using. 133 private final long[] mOomMinFree = new long[mOomAdj.length]; 134 135 private final long mTotalMemMb; 136 137 private boolean mHaveDisplaySize; 138 139 ProcessList() { 140 MemInfoReader minfo = new MemInfoReader(); 141 minfo.readMemInfo(); 142 mTotalMemMb = minfo.getTotalSize()/(1024*1024); 143 updateOomLevels(0, 0, false); 144 } 145 146 void applyDisplaySize(WindowManagerService wm) { 147 if (!mHaveDisplaySize) { 148 Point p = new Point(); 149 wm.getInitialDisplaySize(p); 150 if (p.x != 0 && p.y != 0) { 151 updateOomLevels(p.x, p.y, true); 152 mHaveDisplaySize = true; 153 } 154 } 155 } 156 157 private void updateOomLevels(int displayWidth, int displayHeight, boolean write) { 158 // Scale buckets from avail memory: at 300MB we use the lowest values to 159 // 700MB or more for the top values. 160 float scaleMem = ((float)(mTotalMemMb-300))/(700-300); 161 162 // Scale buckets from screen size. 163 int minSize = 320*480; // 153600 164 int maxSize = 1280*800; // 1024000 230400 870400 .264 165 float scaleDisp = ((float)(displayWidth*displayHeight)-minSize)/(maxSize-minSize); 166 //Slog.i("XXXXXX", "scaleDisp=" + scaleDisp + " dw=" + displayWidth + " dh=" + displayHeight); 167 168 StringBuilder adjString = new StringBuilder(); 169 StringBuilder memString = new StringBuilder(); 170 171 float scale = scaleMem > scaleDisp ? scaleMem : scaleDisp; 172 if (scale < 0) scale = 0; 173 else if (scale > 1) scale = 1; 174 for (int i=0; i<mOomAdj.length; i++) { 175 long low = mOomMinFreeLow[i]; 176 long high = mOomMinFreeHigh[i]; 177 mOomMinFree[i] = (long)(low + ((high-low)*scale)); 178 179 if (i > 0) { 180 adjString.append(','); 181 memString.append(','); 182 } 183 adjString.append(mOomAdj[i]); 184 memString.append((mOomMinFree[i]*1024)/PAGE_SIZE); 185 } 186 187 //Slog.i("XXXXXXX", "******************************* MINFREE: " + memString); 188 if (write) { 189 writeFile("/sys/module/lowmemorykiller/parameters/adj", adjString.toString()); 190 writeFile("/sys/module/lowmemorykiller/parameters/minfree", memString.toString()); 191 } 192 // GB: 2048,3072,4096,6144,7168,8192 193 // HC: 8192,10240,12288,14336,16384,20480 194 } 195 196 long getMemLevel(int adjustment) { 197 for (int i=0; i<mOomAdj.length; i++) { 198 if (adjustment <= mOomAdj[i]) { 199 return mOomMinFree[i] * 1024; 200 } 201 } 202 return mOomMinFree[mOomAdj.length-1] * 1024; 203 } 204 205 private void writeFile(String path, String data) { 206 FileOutputStream fos = null; 207 try { 208 fos = new FileOutputStream(path); 209 fos.write(data.getBytes()); 210 } catch (IOException e) { 211 Slog.w(ActivityManagerService.TAG, "Unable to write " + path); 212 } finally { 213 if (fos != null) { 214 try { 215 fos.close(); 216 } catch (IOException e) { 217 } 218 } 219 } 220 } 221 } 222
