| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.am; |
| |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| |
| import com.android.internal.util.MemInfoReader; |
| import com.android.server.wm.WindowManagerService; |
| |
| import android.graphics.Point; |
| import android.util.Slog; |
| import android.view.Display; |
| |
| /** |
| * Activity manager code dealing with processes. |
| */ |
| class ProcessList { |
| // The minimum time we allow between crashes, for us to consider this |
| // application to be bad and stop and its services and reject broadcasts. |
| static final int MIN_CRASH_INTERVAL = 60*1000; |
| |
| // OOM adjustments for processes in various states: |
| |
| // This is a process only hosting activities that are not visible, |
| // so it can be killed without any disruption. |
| static final int HIDDEN_APP_MAX_ADJ = 15; |
| static int HIDDEN_APP_MIN_ADJ = 9; |
| |
| // The B list of SERVICE_ADJ -- these are the old and decrepit |
| // services that aren't as shiny and interesting as the ones in the A list. |
| static final int SERVICE_B_ADJ = 8; |
| |
| // This is the process of the previous application that the user was in. |
| // This process is kept above other things, because it is very common to |
| // switch back to the previous app. This is important both for recent |
| // task switch (toggling between the two top recent apps) as well as normal |
| // UI flow such as clicking on a URI in the e-mail app to view in the browser, |
| // and then pressing back to return to e-mail. |
| static final int PREVIOUS_APP_ADJ = 7; |
| |
| // This is a process holding the home application -- we want to try |
| // avoiding killing it, even if it would normally be in the background, |
| // because the user interacts with it so much. |
| static final int HOME_APP_ADJ = 6; |
| |
| // This is a process holding an application service -- killing it will not |
| // have much of an impact as far as the user is concerned. |
| static final int SERVICE_ADJ = 5; |
| |
| // This is a process currently hosting a backup operation. Killing it |
| // is not entirely fatal but is generally a bad idea. |
| static final int BACKUP_APP_ADJ = 4; |
| |
| // This is a process with a heavy-weight application. It is in the |
| // background, but we want to try to avoid killing it. Value set in |
| // system/rootdir/init.rc on startup. |
| static final int HEAVY_WEIGHT_APP_ADJ = 3; |
| |
| // This is a process only hosting components that are perceptible to the |
| // user, and we really want to avoid killing them, but they are not |
| // immediately visible. An example is background music playback. |
| static final int PERCEPTIBLE_APP_ADJ = 2; |
| |
| // This is a process only hosting activities that are visible to the |
| // user, so we'd prefer they don't disappear. |
| static final int VISIBLE_APP_ADJ = 1; |
| |
| // This is the process running the current foreground app. We'd really |
| // rather not kill it! |
| static final int FOREGROUND_APP_ADJ = 0; |
| |
| // This is a system persistent process, such as telephony. Definitely |
| // don't want to kill it, but doing so is not completely fatal. |
| static final int PERSISTENT_PROC_ADJ = -12; |
| |
| // The system process runs at the default adjustment. |
| static final int SYSTEM_ADJ = -16; |
| |
| // Memory pages are 4K. |
| static final int PAGE_SIZE = 4*1024; |
| |
| // The minimum number of hidden apps we want to be able to keep around, |
| // without empty apps being able to push them out of memory. |
| static final int MIN_HIDDEN_APPS = 2; |
| |
| // The maximum number of hidden processes we will keep around before |
| // killing them; this is just a control to not let us go too crazy with |
| // keeping around processes on devices with large amounts of RAM. |
| static final int MAX_HIDDEN_APPS = 24; |
| |
| // We allow empty processes to stick around for at most 30 minutes. |
| static final long MAX_EMPTY_TIME = 30*60*1000; |
| |
| // The number of hidden at which we don't consider it necessary to do |
| // memory trimming. |
| static final int TRIM_HIDDEN_APPS = 3; |
| |
| // The number of empty apps at which we don't consider it necessary to do |
| // memory trimming. |
| static final int TRIM_EMPTY_APPS = 3; |
| |
| // Threshold of number of hidden+empty where we consider memory critical. |
| static final int TRIM_CRITICAL_THRESHOLD = 3; |
| |
| // Threshold of number of hidden+empty where we consider memory critical. |
| static final int TRIM_LOW_THRESHOLD = 5; |
| |
| // We put empty content processes after any hidden processes that have |
| // been idle for less than 15 seconds. |
| static final long CONTENT_APP_IDLE_OFFSET = 15*1000; |
| |
| // We put empty content processes after any hidden processes that have |
| // been idle for less than 120 seconds. |
| static final long EMPTY_APP_IDLE_OFFSET = 120*1000; |
| |
| // These are the various interesting memory levels that we will give to |
| // the OOM killer. Note that the OOM killer only supports 6 slots, so we |
| // can't give it a different value for every possible kind of process. |
| private final int[] mOomAdj = new int[] { |
| FOREGROUND_APP_ADJ, VISIBLE_APP_ADJ, PERCEPTIBLE_APP_ADJ, |
| BACKUP_APP_ADJ, HIDDEN_APP_MIN_ADJ, HIDDEN_APP_MAX_ADJ |
| }; |
| // These are the low-end OOM level limits. This is appropriate for an |
| // HVGA or smaller phone with less than 512MB. Values are in KB. |
| private final long[] mOomMinFreeLow = new long[] { |
| 8192, 12288, 16384, |
| 24576, 28672, 32768 |
| }; |
| // These are the high-end OOM level limits. This is appropriate for a |
| // 1280x800 or larger screen with around 1GB RAM. Values are in KB. |
| private final long[] mOomMinFreeHigh = new long[] { |
| 32768, 40960, 49152, |
| 57344, 65536, 81920 |
| }; |
| // The actual OOM killer memory levels we are using. |
| private final long[] mOomMinFree = new long[mOomAdj.length]; |
| |
| private final long mTotalMemMb; |
| |
| private boolean mHaveDisplaySize; |
| |
| ProcessList() { |
| MemInfoReader minfo = new MemInfoReader(); |
| minfo.readMemInfo(); |
| mTotalMemMb = minfo.getTotalSize()/(1024*1024); |
| updateOomLevels(0, 0, false); |
| } |
| |
| void applyDisplaySize(WindowManagerService wm) { |
| if (!mHaveDisplaySize) { |
| Point p = new Point(); |
| wm.getInitialDisplaySize(Display.DEFAULT_DISPLAY, p); |
| if (p.x != 0 && p.y != 0) { |
| updateOomLevels(p.x, p.y, true); |
| mHaveDisplaySize = true; |
| } |
| } |
| } |
| |
| private void updateOomLevels(int displayWidth, int displayHeight, boolean write) { |
| // Scale buckets from avail memory: at 300MB we use the lowest values to |
| // 700MB or more for the top values. |
| float scaleMem = ((float)(mTotalMemMb-300))/(700-300); |
| |
| // Scale buckets from screen size. |
| int minSize = 320*480; // 153600 |
| int maxSize = 1280*800; // 1024000 230400 870400 .264 |
| float scaleDisp = ((float)(displayWidth*displayHeight)-minSize)/(maxSize-minSize); |
| //Slog.i("XXXXXX", "scaleDisp=" + scaleDisp + " dw=" + displayWidth + " dh=" + displayHeight); |
| |
| StringBuilder adjString = new StringBuilder(); |
| StringBuilder memString = new StringBuilder(); |
| |
| float scale = scaleMem > scaleDisp ? scaleMem : scaleDisp; |
| if (scale < 0) scale = 0; |
| else if (scale > 1) scale = 1; |
| for (int i=0; i<mOomAdj.length; i++) { |
| long low = mOomMinFreeLow[i]; |
| long high = mOomMinFreeHigh[i]; |
| mOomMinFree[i] = (long)(low + ((high-low)*scale)); |
| |
| if (i > 0) { |
| adjString.append(','); |
| memString.append(','); |
| } |
| adjString.append(mOomAdj[i]); |
| memString.append((mOomMinFree[i]*1024)/PAGE_SIZE); |
| } |
| |
| //Slog.i("XXXXXXX", "******************************* MINFREE: " + memString); |
| if (write) { |
| writeFile("/sys/module/lowmemorykiller/parameters/adj", adjString.toString()); |
| writeFile("/sys/module/lowmemorykiller/parameters/minfree", memString.toString()); |
| } |
| // GB: 2048,3072,4096,6144,7168,8192 |
| // HC: 8192,10240,12288,14336,16384,20480 |
| } |
| |
| long getMemLevel(int adjustment) { |
| for (int i=0; i<mOomAdj.length; i++) { |
| if (adjustment <= mOomAdj[i]) { |
| return mOomMinFree[i] * 1024; |
| } |
| } |
| return mOomMinFree[mOomAdj.length-1] * 1024; |
| } |
| |
| private void writeFile(String path, String data) { |
| FileOutputStream fos = null; |
| try { |
| fos = new FileOutputStream(path); |
| fos.write(data.getBytes()); |
| } catch (IOException e) { |
| Slog.w(ActivityManagerService.TAG, "Unable to write " + path); |
| } finally { |
| if (fos != null) { |
| try { |
| fos.close(); |
| } catch (IOException e) { |
| } |
| } |
| } |
| } |
| } |