/*
* 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 static com.android.server.am.ActivityManagerDebugConfig.TAG_AM;
import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.nio.ByteBuffer;
import android.app.ActivityManager;
import android.app.AppProtoEnums;
import android.os.Build;
import android.os.SystemClock;
import com.android.internal.util.MemInfoReader;
import com.android.server.wm.WindowManagerService;
import android.content.res.Resources;
import android.graphics.Point;
import android.os.SystemProperties;
import android.net.LocalSocketAddress;
import android.net.LocalSocket;
import android.util.Slog;
import android.view.Display;
/**
* Activity manager code dealing with processes.
*/
public final class ProcessList {
private static final String TAG = TAG_WITH_CLASS_NAME ? "ProcessList" : TAG_AM;
// 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:
// Uninitialized value for any major or minor adj fields
static final int INVALID_ADJ = -10000;
// Adjustment used in certain places where we don't know it yet.
// (Generally this is something that is going to be cached, but we
// don't know the exact value in the cached range to assign yet.)
static final int UNKNOWN_ADJ = 1001;
// This is a process only hosting activities that are not visible,
// so it can be killed without any disruption.
static final int CACHED_APP_MAX_ADJ = 906;
static final int CACHED_APP_MIN_ADJ = 900;
// 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 = 800;
// 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 = 700;
// 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 = 600;
// 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 = 500;
// 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 = 400;
// 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 = 300;
// 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 = 200;
// 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 = 100;
static final int VISIBLE_APP_LAYER_MAX = PERCEPTIBLE_APP_ADJ - 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 process that the system or a persistent process has bound to,
// and indicated it is important.
static final int PERSISTENT_SERVICE_ADJ = -700;
// 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 = -800;
// The system process runs at the default adjustment.
static final int SYSTEM_ADJ = -900;
// Special code for native processes that are not being managed by the system (so
// don't have an oom adj assigned by the system).
static final int NATIVE_ADJ = -1000;
// Memory pages are 4K.
static final int PAGE_SIZE = 4*1024;
// Activity manager's version of Process.THREAD_GROUP_BG_NONINTERACTIVE
static final int SCHED_GROUP_BACKGROUND = 0;
// Activity manager's version of Process.THREAD_GROUP_RESTRICTED
static final int SCHED_GROUP_RESTRICTED = 1;
// Activity manager's version of Process.THREAD_GROUP_DEFAULT
static final int SCHED_GROUP_DEFAULT = 2;
// Activity manager's version of Process.THREAD_GROUP_TOP_APP
static final int SCHED_GROUP_TOP_APP = 3;
// Activity manager's version of Process.THREAD_GROUP_TOP_APP
// Disambiguate between actual top app and processes bound to the top app
static final int SCHED_GROUP_TOP_APP_BOUND = 4;
// The minimum number of cached apps we want to be able to keep around,
// without empty apps being able to push them out of memory.
static final int MIN_CACHED_APPS = 2;
// We allow empty processes to stick around for at most 30 minutes.
static final long MAX_EMPTY_TIME = 30*60*1000;
// Threshold of number of cached+empty where we consider memory critical.
static final int TRIM_CRITICAL_THRESHOLD = 3;
// Threshold of number of cached+empty where we consider memory critical.
static final int TRIM_LOW_THRESHOLD = 5;
// Low Memory Killer Daemon command codes.
// These must be kept in sync with the definitions in lmkd.c
//
// LMK_TARGET <minfree> <minkillprio> ... (up to 6 pairs)
// LMK_PROCPRIO <pid> <uid> <prio>
// LMK_PROCREMOVE <pid>
static final byte LMK_TARGET = 0;
static final byte LMK_PROCPRIO = 1;
static final byte LMK_PROCREMOVE = 2;
// 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, CACHED_APP_MIN_ADJ, CACHED_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 int[] mOomMinFreeLow = new int[] {
12288, 18432, 24576,
36864, 43008, 49152
};
// 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 int[] mOomMinFreeHigh = new int[] {
73728, 92160, 110592,
129024, 147456, 184320
};
// The actual OOM killer memory levels we are using.
private final int[] mOomMinFree = new int[mOomAdj.length];
private final long mTotalMemMb;
private long mCachedRestoreLevel;
private boolean mHaveDisplaySize;
private static LocalSocket sLmkdSocket;
private static OutputStream sLmkdOutputStream;
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();
// TODO(multi-display): Compute based on sum of all connected displays' resolutions.
wm.getBaseDisplaySize(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-350))/(700-350);
// Scale buckets from screen size.
int minSize = 480*800; // 384000
int maxSize = 1280*800; // 1024000 230400 870400 .264
float scaleDisp = ((float)(displayWidth*displayHeight)-minSize)/(maxSize-minSize);
if (false) {
Slog.i("XXXXXX", "scaleMem=" + scaleMem);
Slog.i("XXXXXX", "scaleDisp=" + scaleDisp + " dw=" + displayWidth
+ " dh=" + displayHeight);
}
float scale = scaleMem > scaleDisp ? scaleMem : scaleDisp;
if (scale < 0) scale = 0;
else if (scale > 1) scale = 1;
int minfree_adj = Resources.getSystem().getInteger(
com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAdjust);
int minfree_abs = Resources.getSystem().getInteger(
com.android.internal.R.integer.config_lowMemoryKillerMinFreeKbytesAbsolute);
if (false) {
Slog.i("XXXXXX", "minfree_adj=" + minfree_adj + " minfree_abs=" + minfree_abs);
}
final boolean is64bit = Build.SUPPORTED_64_BIT_ABIS.length > 0;
for (int i=0; i<mOomAdj.length; i++) {
int low = mOomMinFreeLow[i];
int high = mOomMinFreeHigh[i];
if (is64bit) {
// Increase the high min-free levels for cached processes for 64-bit
if (i == 4) high = (high*3)/2;
else if (i == 5) high = (high*7)/4;
}
mOomMinFree[i] = (int)(low + ((high-low)*scale));
}
if (minfree_abs >= 0) {
for (int i=0; i<mOomAdj.length; i++) {
mOomMinFree[i] = (int)((float)minfree_abs * mOomMinFree[i]
/ mOomMinFree[mOomAdj.length - 1]);
}
}
if (minfree_adj != 0) {
for (int i=0; i<mOomAdj.length; i++) {
mOomMinFree[i] += (int)((float)minfree_adj * mOomMinFree[i]
/ mOomMinFree[mOomAdj.length - 1]);
if (mOomMinFree[i] < 0) {
mOomMinFree[i] = 0;
}
}
}
// The maximum size we will restore a process from cached to background, when under
// memory duress, is 1/3 the size we have reserved for kernel caches and other overhead
// before killing background processes.
mCachedRestoreLevel = (getMemLevel(ProcessList.CACHED_APP_MAX_ADJ)/1024) / 3;
// Ask the kernel to try to keep enough memory free to allocate 3 full
// screen 32bpp buffers without entering direct reclaim.
int reserve = displayWidth * displayHeight * 4 * 3 / 1024;
int reserve_adj = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAdjust);
int reserve_abs = Resources.getSystem().getInteger(com.android.internal.R.integer.config_extraFreeKbytesAbsolute);
if (reserve_abs >= 0) {
reserve = reserve_abs;
}
if (reserve_adj != 0) {
reserve += reserve_adj;
if (reserve < 0) {
reserve = 0;
}
}
if (write) {
ByteBuffer buf = ByteBuffer.allocate(4 * (2*mOomAdj.length + 1));
buf.putInt(LMK_TARGET);
for (int i=0; i<mOomAdj.length; i++) {
buf.putInt((mOomMinFree[i]*1024)/PAGE_SIZE);
buf.putInt(mOomAdj[i]);
}
writeLmkd(buf);
SystemProperties.set("sys.sysctl.extra_free_kbytes", Integer.toString(reserve));
}
// GB: 2048,3072,4096,6144,7168,8192
// HC: 8192,10240,12288,14336,16384,20480
}
public static int computeEmptyProcessLimit(int totalProcessLimit) {
return totalProcessLimit/2;
}
private static String buildOomTag(String prefix, String space, int val, int base) {
if (val == base) {
if (space == null) return prefix;
return prefix + " ";
}
return prefix + "+" + Integer.toString(val-base);
}
public static String makeOomAdjString(int setAdj) {
if (setAdj >= ProcessList.CACHED_APP_MIN_ADJ) {
return buildOomTag("cch", " ", setAdj, ProcessList.CACHED_APP_MIN_ADJ);
} else if (setAdj >= ProcessList.SERVICE_B_ADJ) {
return buildOomTag("svcb ", null, setAdj, ProcessList.SERVICE_B_ADJ);
} else if (setAdj >= ProcessList.PREVIOUS_APP_ADJ) {
return buildOomTag("prev ", null, setAdj, ProcessList.PREVIOUS_APP_ADJ);
} else if (setAdj >= ProcessList.HOME_APP_ADJ) {
return buildOomTag("home ", null, setAdj, ProcessList.HOME_APP_ADJ);
} else if (setAdj >= ProcessList.SERVICE_ADJ) {
return buildOomTag("svc ", null, setAdj, ProcessList.SERVICE_ADJ);
} else if (setAdj >= ProcessList.HEAVY_WEIGHT_APP_ADJ) {
return buildOomTag("hvy ", null, setAdj, ProcessList.HEAVY_WEIGHT_APP_ADJ);
} else if (setAdj >= ProcessList.BACKUP_APP_ADJ) {
return buildOomTag("bkup ", null, setAdj, ProcessList.BACKUP_APP_ADJ);
} else if (setAdj >= ProcessList.PERCEPTIBLE_APP_ADJ) {
return buildOomTag("prcp ", null, setAdj, ProcessList.PERCEPTIBLE_APP_ADJ);
} else if (setAdj >= ProcessList.VISIBLE_APP_ADJ) {
return buildOomTag("vis ", null, setAdj, ProcessList.VISIBLE_APP_ADJ);
} else if (setAdj >= ProcessList.FOREGROUND_APP_ADJ) {
return buildOomTag("fore ", null, setAdj, ProcessList.FOREGROUND_APP_ADJ);
} else if (setAdj >= ProcessList.PERSISTENT_SERVICE_ADJ) {
return buildOomTag("psvc ", null, setAdj, ProcessList.PERSISTENT_SERVICE_ADJ);
} else if (setAdj >= ProcessList.PERSISTENT_PROC_ADJ) {
return buildOomTag("pers ", null, setAdj, ProcessList.PERSISTENT_PROC_ADJ);
} else if (setAdj >= ProcessList.SYSTEM_ADJ) {
return buildOomTag("sys ", null, setAdj, ProcessList.SYSTEM_ADJ);
} else if (setAdj >= ProcessList.NATIVE_ADJ) {
return buildOomTag("ntv ", null, setAdj, ProcessList.NATIVE_ADJ);
} else {
return Integer.toString(setAdj);
}
}
public static String makeProcStateString(int curProcState) {
String procState;
switch (curProcState) {
case ActivityManager.PROCESS_STATE_PERSISTENT:
procState = "PER ";
break;
case ActivityManager.PROCESS_STATE_PERSISTENT_UI:
procState = "PERU";
break;
case ActivityManager.PROCESS_STATE_TOP:
procState = "TOP ";
break;
case ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE:
procState = "FGS ";
break;
case ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE:
procState = "BFGS";
break;
case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND:
procState = "IMPF";
break;
case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND:
procState = "IMPB";
break;
case ActivityManager.PROCESS_STATE_TRANSIENT_BACKGROUND:
procState = "TRNB";
break;
case ActivityManager.PROCESS_STATE_BACKUP:
procState = "BKUP";
break;
case ActivityManager.PROCESS_STATE_SERVICE:
procState = "SVC ";
break;
case ActivityManager.PROCESS_STATE_RECEIVER:
procState = "RCVR";
break;
case ActivityManager.PROCESS_STATE_TOP_SLEEPING:
procState = "TPSL";
break;
case ActivityManager.PROCESS_STATE_HEAVY_WEIGHT:
procState = "HVY ";
break;
case ActivityManager.PROCESS_STATE_HOME:
procState = "HOME";
break;
case ActivityManager.PROCESS_STATE_LAST_ACTIVITY:
procState = "LAST";
break;
case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY:
procState = "CAC ";
break;
case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT:
procState = "CACC";
break;
case ActivityManager.PROCESS_STATE_CACHED_RECENT:
procState = "CRE ";
break;
case ActivityManager.PROCESS_STATE_CACHED_EMPTY:
procState = "CEM ";
break;
case ActivityManager.PROCESS_STATE_NONEXISTENT:
procState = "NONE";
break;
default:
procState = "??";
break;
}
return procState;
}
public static int makeProcStateProtoEnum(int curProcState) {
switch (curProcState) {
case ActivityManager.PROCESS_STATE_PERSISTENT:
return AppProtoEnums.PROCESS_STATE_PERSISTENT;
case ActivityManager.PROCESS_STATE_PERSISTENT_UI:
return AppProtoEnums.PROCESS_STATE_PERSISTENT_UI;
case ActivityManager.PROCESS_STATE_TOP:
return AppProtoEnums.PROCESS_STATE_TOP;
case ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE:
return AppProtoEnums.PROCESS_STATE_BOUND_FOREGROUND_SERVICE;
case ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE:
return AppProtoEnums.PROCESS_STATE_FOREGROUND_SERVICE;
case ActivityManager.PROCESS_STATE_TOP_SLEEPING:
return AppProtoEnums.PROCESS_STATE_TOP_SLEEPING;
case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND:
return AppProtoEnums.PROCESS_STATE_IMPORTANT_FOREGROUND;
case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND:
return AppProtoEnums.PROCESS_STATE_IMPORTANT_BACKGROUND;
case ActivityManager.PROCESS_STATE_TRANSIENT_BACKGROUND:
return AppProtoEnums.PROCESS_STATE_TRANSIENT_BACKGROUND;
case ActivityManager.PROCESS_STATE_BACKUP:
return AppProtoEnums.PROCESS_STATE_BACKUP;
case ActivityManager.PROCESS_STATE_HEAVY_WEIGHT:
return AppProtoEnums.PROCESS_STATE_HEAVY_WEIGHT;
case ActivityManager.PROCESS_STATE_SERVICE:
return AppProtoEnums.PROCESS_STATE_SERVICE;
case ActivityManager.PROCESS_STATE_RECEIVER:
return AppProtoEnums.PROCESS_STATE_RECEIVER;
case ActivityManager.PROCESS_STATE_HOME:
return AppProtoEnums.PROCESS_STATE_HOME;
case ActivityManager.PROCESS_STATE_LAST_ACTIVITY:
return AppProtoEnums.PROCESS_STATE_LAST_ACTIVITY;
case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY:
return AppProtoEnums.PROCESS_STATE_CACHED_ACTIVITY;
case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT:
return AppProtoEnums.PROCESS_STATE_CACHED_ACTIVITY_CLIENT;
case ActivityManager.PROCESS_STATE_CACHED_RECENT:
return AppProtoEnums.PROCESS_STATE_CACHED_RECENT;
case ActivityManager.PROCESS_STATE_CACHED_EMPTY:
return AppProtoEnums.PROCESS_STATE_CACHED_EMPTY;
case ActivityManager.PROCESS_STATE_NONEXISTENT:
return AppProtoEnums.PROCESS_STATE_NONEXISTENT;
case ActivityManager.PROCESS_STATE_UNKNOWN:
return AppProtoEnums.PROCESS_STATE_UNKNOWN;
default:
return AppProtoEnums.PROCESS_STATE_UNKNOWN_TO_PROTO;
}
}
public static void appendRamKb(StringBuilder sb, long ramKb) {
for (int j=0, fact=10; j<6; j++, fact*=10) {
if (ramKb < fact) {
sb.append(' ');
}
}
sb.append(ramKb);
}
// How long after a state change that it is safe to collect PSS without it being dirty.
public static final int PSS_SAFE_TIME_FROM_STATE_CHANGE = 1000;
// The minimum time interval after a state change it is safe to collect PSS.
public static final int PSS_MIN_TIME_FROM_STATE_CHANGE = 15*1000;
// The maximum amount of time we want to go between PSS collections.
public static final int PSS_MAX_INTERVAL = 60*60*1000;
// The minimum amount of time between successive PSS requests for *all* processes.
public static final int PSS_ALL_INTERVAL = 20*60*1000;
// The amount of time until PSS when a persistent process first appears.
private static final int PSS_FIRST_PERSISTENT_INTERVAL = 30*1000;
// The amount of time until PSS when a process first becomes top.
private static final int PSS_FIRST_TOP_INTERVAL = 10*1000;
// The amount of time until PSS when a process first goes into the background.
private static final int PSS_FIRST_BACKGROUND_INTERVAL = 20*1000;
// The amount of time until PSS when a process first becomes cached.
private static final int PSS_FIRST_CACHED_INTERVAL = 20*1000;
// The amount of time until PSS when an important process stays in the same state.
private static final int PSS_SAME_PERSISTENT_INTERVAL = 10*60*1000;
// The amount of time until PSS when the top process stays in the same state.
private static final int PSS_SAME_TOP_INTERVAL = 1*60*1000;
// The amount of time until PSS when an important process stays in the same state.
private static final int PSS_SAME_IMPORTANT_INTERVAL = 10*60*1000;
// The amount of time until PSS when a service process stays in the same state.
private static final int PSS_SAME_SERVICE_INTERVAL = 5*60*1000;
// The amount of time until PSS when a cached process stays in the same state.
private static final int PSS_SAME_CACHED_INTERVAL = 10*60*1000;
// The amount of time until PSS when a persistent process first appears.
private static final int PSS_FIRST_ASLEEP_PERSISTENT_INTERVAL = 1*60*1000;
// The amount of time until PSS when a process first becomes top.
private static final int PSS_FIRST_ASLEEP_TOP_INTERVAL = 20*1000;
// The amount of time until PSS when a process first goes into the background.
private static final int PSS_FIRST_ASLEEP_BACKGROUND_INTERVAL = 30*1000;
// The amount of time until PSS when a process first becomes cached.
private static final int PSS_FIRST_ASLEEP_CACHED_INTERVAL = 1*60*1000;
// The minimum time interval after a state change it is safe to collect PSS.
public static final int PSS_TEST_MIN_TIME_FROM_STATE_CHANGE = 10*1000;
// The amount of time during testing until PSS when a process first becomes top.
private static final int PSS_TEST_FIRST_TOP_INTERVAL = 3*1000;
// The amount of time during testing until PSS when a process first goes into the background.
private static final int PSS_TEST_FIRST_BACKGROUND_INTERVAL = 5*1000;
// The amount of time during testing until PSS when an important process stays in same state.
private static final int PSS_TEST_SAME_IMPORTANT_INTERVAL = 10*1000;
// The amount of time during testing until PSS when a background process stays in same state.
private static final int PSS_TEST_SAME_BACKGROUND_INTERVAL = 15*1000;
public static final int PROC_MEM_PERSISTENT = 0;
public static final int PROC_MEM_TOP = 1;
public static final int PROC_MEM_IMPORTANT = 2;
public static final int PROC_MEM_SERVICE = 3;
public static final int PROC_MEM_CACHED = 4;
public static final int PROC_MEM_NUM = 5;
// Map large set of system process states to
private static final int[] sProcStateToProcMem = new int[] {
PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT
PROC_MEM_PERSISTENT, // ActivityManager.PROCESS_STATE_PERSISTENT_UI
PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP
PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE
PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE
PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND
PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND
PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_TRANSIENT_BACKGROUND
PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_BACKUP
PROC_MEM_SERVICE, // ActivityManager.PROCESS_STATE_SERVICE
PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_RECEIVER
PROC_MEM_TOP, // ActivityManager.PROCESS_STATE_TOP_SLEEPING
PROC_MEM_IMPORTANT, // ActivityManager.PROCESS_STATE_HEAVY_WEIGHT
PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_HOME
PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_LAST_ACTIVITY
PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY
PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT
PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_RECENT
PROC_MEM_CACHED, // ActivityManager.PROCESS_STATE_CACHED_EMPTY
};
private static final long[] sFirstAwakePssTimes = new long[] {
PSS_FIRST_PERSISTENT_INTERVAL, // PROC_MEM_PERSISTENT
PSS_FIRST_TOP_INTERVAL, // PROC_MEM_TOP
PSS_FIRST_BACKGROUND_INTERVAL, // PROC_MEM_IMPORTANT
PSS_FIRST_BACKGROUND_INTERVAL, // PROC_MEM_SERVICE
PSS_FIRST_CACHED_INTERVAL, // PROC_MEM_CACHED
};
private static final long[] sSameAwakePssTimes = new long[] {
PSS_SAME_PERSISTENT_INTERVAL, // PROC_MEM_PERSISTENT
PSS_SAME_TOP_INTERVAL, // PROC_MEM_TOP
PSS_SAME_IMPORTANT_INTERVAL, // PROC_MEM_IMPORTANT
PSS_SAME_SERVICE_INTERVAL, // PROC_MEM_SERVICE
PSS_SAME_CACHED_INTERVAL, // PROC_MEM_CACHED
};
private static final long[] sFirstAsleepPssTimes = new long[] {
PSS_FIRST_ASLEEP_PERSISTENT_INTERVAL, // PROC_MEM_PERSISTENT
PSS_FIRST_ASLEEP_TOP_INTERVAL, // PROC_MEM_TOP
PSS_FIRST_ASLEEP_BACKGROUND_INTERVAL, // PROC_MEM_IMPORTANT
PSS_FIRST_ASLEEP_BACKGROUND_INTERVAL, // PROC_MEM_SERVICE
PSS_FIRST_ASLEEP_CACHED_INTERVAL, // PROC_MEM_CACHED
};
private static final long[] sSameAsleepPssTimes = new long[] {
PSS_SAME_PERSISTENT_INTERVAL, // PROC_MEM_PERSISTENT
PSS_SAME_TOP_INTERVAL, // PROC_MEM_TOP
PSS_SAME_IMPORTANT_INTERVAL, // PROC_MEM_IMPORTANT
PSS_SAME_SERVICE_INTERVAL, // PROC_MEM_SERVICE
PSS_SAME_CACHED_INTERVAL, // PROC_MEM_CACHED
};
private static final long[] sTestFirstPssTimes = new long[] {
PSS_TEST_FIRST_TOP_INTERVAL, // PROC_MEM_PERSISTENT
PSS_TEST_FIRST_TOP_INTERVAL, // PROC_MEM_TOP
PSS_TEST_FIRST_BACKGROUND_INTERVAL, // PROC_MEM_IMPORTANT
PSS_TEST_FIRST_BACKGROUND_INTERVAL, // PROC_MEM_SERVICE
PSS_TEST_FIRST_BACKGROUND_INTERVAL, // PROC_MEM_CACHED
};
private static final long[] sTestSamePssTimes = new long[] {
PSS_TEST_SAME_BACKGROUND_INTERVAL, // PROC_MEM_PERSISTENT
PSS_TEST_SAME_IMPORTANT_INTERVAL, // PROC_MEM_TOP
PSS_TEST_SAME_IMPORTANT_INTERVAL, // PROC_MEM_IMPORTANT
PSS_TEST_SAME_BACKGROUND_INTERVAL, // PROC_MEM_SERVICE
PSS_TEST_SAME_BACKGROUND_INTERVAL, // PROC_MEM_CACHED
};
public static final class ProcStateMemTracker {
final int[] mHighestMem = new int[PROC_MEM_NUM];
final float[] mScalingFactor = new float[PROC_MEM_NUM];
int mTotalHighestMem = PROC_MEM_CACHED;
int mPendingMemState;
int mPendingHighestMemState;
float mPendingScalingFactor;
public ProcStateMemTracker() {
for (int i = PROC_MEM_PERSISTENT; i < PROC_MEM_NUM; i++) {
mHighestMem[i] = PROC_MEM_NUM;
mScalingFactor[i] = 1.0f;
}
mPendingMemState = -1;
}
public void dumpLine(PrintWriter pw) {
pw.print("best=");
pw.print(mTotalHighestMem);
pw.print(" (");
boolean needSep = false;
for (int i = 0; i < PROC_MEM_NUM; i++) {
if (mHighestMem[i] < PROC_MEM_NUM) {
if (needSep) {
pw.print(", ");
needSep = false;
}
pw.print(i);
pw.print("=");
pw.print(mHighestMem[i]);
pw.print(" ");
pw.print(mScalingFactor[i]);
pw.print("x");
needSep = true;
}
}
pw.print(")");
if (mPendingMemState >= 0) {
pw.print(" / pending state=");
pw.print(mPendingMemState);
pw.print(" highest=");
pw.print(mPendingHighestMemState);
pw.print(" ");
pw.print(mPendingScalingFactor);
pw.print("x");
}
pw.println();
}
}
public static boolean procStatesDifferForMem(int procState1, int procState2) {
return sProcStateToProcMem[procState1] != sProcStateToProcMem[procState2];
}
public static long minTimeFromStateChange(boolean test) {
return test ? PSS_TEST_MIN_TIME_FROM_STATE_CHANGE : PSS_MIN_TIME_FROM_STATE_CHANGE;
}
public static void commitNextPssTime(ProcStateMemTracker tracker) {
if (tracker.mPendingMemState >= 0) {
tracker.mHighestMem[tracker.mPendingMemState] = tracker.mPendingHighestMemState;
tracker.mScalingFactor[tracker.mPendingMemState] = tracker.mPendingScalingFactor;
tracker.mTotalHighestMem = tracker.mPendingHighestMemState;
tracker.mPendingMemState = -1;
}
}
public static void abortNextPssTime(ProcStateMemTracker tracker) {
tracker.mPendingMemState = -1;
}
public static long computeNextPssTime(int procState, ProcStateMemTracker tracker, boolean test,
boolean sleeping, long now) {
boolean first;
float scalingFactor;
final int memState = sProcStateToProcMem[procState];
if (tracker != null) {
final int highestMemState = memState < tracker.mTotalHighestMem
? memState : tracker.mTotalHighestMem;
first = highestMemState < tracker.mHighestMem[memState];
tracker.mPendingMemState = memState;
tracker.mPendingHighestMemState = highestMemState;
if (first) {
tracker.mPendingScalingFactor = scalingFactor = 1.0f;
} else {
scalingFactor = tracker.mScalingFactor[memState];
tracker.mPendingScalingFactor = scalingFactor * 1.5f;
}
} else {
first = true;
scalingFactor = 1.0f;
}
final long[] table = test
? (first
? sTestFirstPssTimes
: sTestSamePssTimes)
: (first
? (sleeping ? sFirstAsleepPssTimes : sFirstAwakePssTimes)
: (sleeping ? sSameAsleepPssTimes : sSameAwakePssTimes));
long delay = (long)(table[memState] * scalingFactor);
if (delay > PSS_MAX_INTERVAL) {
delay = PSS_MAX_INTERVAL;
}
return now + delay;
}
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;
}
/**
* Return the maximum pss size in kb that we consider a process acceptable to
* restore from its cached state for running in the background when RAM is low.
*/
long getCachedRestoreThresholdKb() {
return mCachedRestoreLevel;
}
/**
* Set the out-of-memory badness adjustment for a process.
* If {@code pid <= 0}, this method will be a no-op.
*
* @param pid The process identifier to set.
* @param uid The uid of the app
* @param amt Adjustment value -- lmkd allows -16 to +15.
*
* {@hide}
*/
public static final void setOomAdj(int pid, int uid, int amt) {
// This indicates that the process is not started yet and so no need to proceed further.
if (pid <= 0) {
return;
}
if (amt == UNKNOWN_ADJ)
return;
long start = SystemClock.elapsedRealtime();
ByteBuffer buf = ByteBuffer.allocate(4 * 4);
buf.putInt(LMK_PROCPRIO);
buf.putInt(pid);
buf.putInt(uid);
buf.putInt(amt);
writeLmkd(buf);
long now = SystemClock.elapsedRealtime();
if ((now-start) > 250) {
Slog.w("ActivityManager", "SLOW OOM ADJ: " + (now-start) + "ms for pid " + pid
+ " = " + amt);
}
}
/*
* {@hide}
*/
public static final void remove(int pid) {
// This indicates that the process is not started yet and so no need to proceed further.
if (pid <= 0) {
return;
}
ByteBuffer buf = ByteBuffer.allocate(4 * 2);
buf.putInt(LMK_PROCREMOVE);
buf.putInt(pid);
writeLmkd(buf);
}
private static boolean openLmkdSocket() {
try {
sLmkdSocket = new LocalSocket(LocalSocket.SOCKET_SEQPACKET);
sLmkdSocket.connect(
new LocalSocketAddress("lmkd",
LocalSocketAddress.Namespace.RESERVED));
sLmkdOutputStream = sLmkdSocket.getOutputStream();
} catch (IOException ex) {
Slog.w(TAG, "lowmemorykiller daemon socket open failed");
sLmkdSocket = null;
return false;
}
return true;
}
private static void writeLmkd(ByteBuffer buf) {
for (int i = 0; i < 3; i++) {
if (sLmkdSocket == null) {
if (openLmkdSocket() == false) {
try {
Thread.sleep(1000);
} catch (InterruptedException ie) {
}
continue;
}
}
try {
sLmkdOutputStream.write(buf.array(), 0, buf.position());
return;
} catch (IOException ex) {
Slog.w(TAG, "Error writing to lowmemorykiller socket");
try {
sLmkdSocket.close();
} catch (IOException ex2) {
}
sLmkdSocket = null;
}
}
}
}