/*
* Copyright (C) 2008 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;
import com.android.server.am.ActivityManagerService;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Debug;
import android.os.Handler;
import android.os.Message;
import android.os.Process;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.provider.Settings;
import android.util.Config;
import android.util.EventLog;
import android.util.Log;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
/** This class calls its monitor every minute. Killing this process if they don't return **/
public class Watchdog extends Thread {
static final String TAG = "Watchdog";
static final boolean localLOGV = false || Config.LOGV;
// Set this to true to use debug default values.
static final boolean DB = false;
static final int MONITOR = 2718;
static final int GLOBAL_PSS = 2719;
static final int TIME_TO_WAIT = DB ? 15*1000 : 60*1000;
static final int EVENT_LOG_TAG = 2802;
static final int EVENT_LOG_PROC_PSS_TAG = 2803;
static final int EVENT_LOG_SOFT_RESET_TAG = 2804;
static final int EVENT_LOG_HARD_RESET_TAG = 2805;
static final int EVENT_LOG_PSS_STATS_TAG = 2806;
static final int EVENT_LOG_PROC_STATS_TAG = 2807;
static final int EVENT_LOG_SCHEDULED_REBOOT_TAG = 2808;
static final int EVENT_LOG_MEMINFO_TAG = 2809;
static final int EVENT_LOG_VMSTAT_TAG = 2810;
static final int EVENT_LOG_REQUESTED_REBOOT_TAG = 2811;
static final int MEMCHECK_DEFAULT_INTERVAL = DB ? 30 : 30*60; // 30 minutes
static final int MEMCHECK_DEFAULT_LOG_REALTIME_INTERVAL = DB ? 60 : 2*60*60; // 2 hours
static final int MEMCHECK_DEFAULT_SYSTEM_SOFT_THRESHOLD = (DB ? 10:16)*1024*1024; // 16MB
static final int MEMCHECK_DEFAULT_SYSTEM_HARD_THRESHOLD = (DB ? 14:20)*1024*1024; // 20MB
static final int MEMCHECK_DEFAULT_PHONE_SOFT_THRESHOLD = (DB ? 4:8)*1024*1024; // 8MB
static final int MEMCHECK_DEFAULT_PHONE_HARD_THRESHOLD = (DB ? 8:12)*1024*1024; // 12MB
static final int MEMCHECK_DEFAULT_EXEC_START_TIME = 1*60*60; // 1:00am
static final int MEMCHECK_DEFAULT_EXEC_END_TIME = 5*60*60; // 5:00am
static final int MEMCHECK_DEFAULT_MIN_SCREEN_OFF = DB ? 1*60 : 5*60; // 5 minutes
static final int MEMCHECK_DEFAULT_MIN_ALARM = DB ? 1*60 : 3*60; // 3 minutes
static final int MEMCHECK_DEFAULT_RECHECK_INTERVAL = DB ? 1*60 : 5*60; // 5 minutes
static final int REBOOT_DEFAULT_INTERVAL = DB ? 1 : 0; // never force reboot
static final int REBOOT_DEFAULT_START_TIME = 3*60*60; // 3:00am
static final int REBOOT_DEFAULT_WINDOW = 60*60; // within 1 hour
static final String CHECKUP_ACTION = "com.android.service.Watchdog.CHECKUP";
static final String REBOOT_ACTION = "com.android.service.Watchdog.REBOOT";
static Watchdog sWatchdog;
/* This handler will be used to post message back onto the main thread */
final Handler mHandler;
final Runnable mGlobalPssCollected;
final ArrayList<Monitor> mMonitors = new ArrayList<Monitor>();
ContentResolver mResolver;
BatteryService mBattery;
PowerManagerService mPower;
AlarmManagerService mAlarm;
ActivityManagerService mActivity;
boolean mCompleted;
boolean mForceKillSystem;
Monitor mCurrentMonitor;
PssRequestor mPhoneReq;
int mPhonePid;
int mPhonePss;
long mLastMemCheckTime = -(MEMCHECK_DEFAULT_INTERVAL*1000);
boolean mHavePss;
long mLastMemCheckRealtime = -(MEMCHECK_DEFAULT_LOG_REALTIME_INTERVAL*1000);
boolean mHaveGlobalPss;
final MemMonitor mSystemMemMonitor = new MemMonitor("system",
Settings.Gservices.MEMCHECK_SYSTEM_ENABLED,
Settings.Gservices.MEMCHECK_SYSTEM_SOFT_THRESHOLD,
MEMCHECK_DEFAULT_SYSTEM_SOFT_THRESHOLD,
Settings.Gservices.MEMCHECK_SYSTEM_HARD_THRESHOLD,
MEMCHECK_DEFAULT_SYSTEM_HARD_THRESHOLD);
final MemMonitor mPhoneMemMonitor = new MemMonitor("com.android.phone",
Settings.Gservices.MEMCHECK_PHONE_ENABLED,
Settings.Gservices.MEMCHECK_PHONE_SOFT_THRESHOLD,
MEMCHECK_DEFAULT_PHONE_SOFT_THRESHOLD,
Settings.Gservices.MEMCHECK_PHONE_HARD_THRESHOLD,
MEMCHECK_DEFAULT_PHONE_HARD_THRESHOLD);
final Calendar mCalendar = Calendar.getInstance();
long mMemcheckLastTime;
long mMemcheckExecStartTime;
long mMemcheckExecEndTime;
int mMinScreenOff = MEMCHECK_DEFAULT_MIN_SCREEN_OFF;
int mMinAlarm = MEMCHECK_DEFAULT_MIN_ALARM;
boolean mNeedScheduledCheck;
PendingIntent mCheckupIntent;
PendingIntent mRebootIntent;
long mBootTime;
int mRebootInterval;
boolean mReqRebootNoWait; // should wait for one interval before reboot?
int mReqRebootInterval = -1; // >= 0 if a reboot has been requested
int mReqRebootStartTime = -1; // >= 0 if a specific start time has been requested
int mReqRebootWindow = -1; // >= 0 if a specific window has been requested
int mReqMinScreenOff = -1; // >= 0 if a specific screen off time has been requested
int mReqMinNextAlarm = -1; // >= 0 if specific time to next alarm has been requested
int mReqRecheckInterval= -1; // >= 0 if a specific recheck interval has been requested
/**
* This class monitors the memory in a particular process.
*/
final class MemMonitor {
final String mProcessName;
final String mEnabledSetting;
final String mSoftSetting;
final String mHardSetting;
int mSoftThreshold;
int mHardThreshold;
boolean mEnabled;
long mLastPss;
static final int STATE_OK = 0;
static final int STATE_SOFT = 1;
static final int STATE_HARD = 2;
int mState;
MemMonitor(String processName, String enabledSetting,
String softSetting, int defSoftThreshold,
String hardSetting, int defHardThreshold) {
mProcessName = processName;
mEnabledSetting = enabledSetting;
mSoftSetting = softSetting;
mHardSetting = hardSetting;
mSoftThreshold = defSoftThreshold;
mHardThreshold = defHardThreshold;
}
void retrieveSettings(ContentResolver resolver) {
mSoftThreshold = Settings.Gservices.getInt(
resolver, mSoftSetting, mSoftThreshold);
mHardThreshold = Settings.Gservices.getInt(
resolver, mHardSetting, mHardThreshold);
mEnabled = Settings.Gservices.getInt(
resolver, mEnabledSetting, 0) != 0;
}
boolean checkLocked(long curTime, int pid, int pss) {
mLastPss = pss;
if (mLastPss < mSoftThreshold) {
mState = STATE_OK;
} else if (mLastPss < mHardThreshold) {
mState = STATE_SOFT;
} else {
mState = STATE_HARD;
}
EventLog.writeEvent(EVENT_LOG_PROC_PSS_TAG, mProcessName, pid, mLastPss);
if (mState == STATE_OK) {
// Memory is good, don't recover.
return false;
}
if (mState == STATE_HARD) {
// Memory is really bad, kill right now.
EventLog.writeEvent(EVENT_LOG_HARD_RESET_TAG, mProcessName, pid,
mHardThreshold, mLastPss);
return mEnabled;
}
// It is time to schedule a reset...
// Check if we are currently within the time to kill processes due
// to memory use.
computeMemcheckTimesLocked(curTime);
String skipReason = null;
if (curTime < mMemcheckExecStartTime || curTime > mMemcheckExecEndTime) {
skipReason = "time";
} else {
skipReason = shouldWeBeBrutalLocked(curTime);
}
EventLog.writeEvent(EVENT_LOG_SOFT_RESET_TAG, mProcessName, pid,
mSoftThreshold, mLastPss, skipReason != null ? skipReason : "");
if (skipReason != null) {
mNeedScheduledCheck = true;
return false;
}
return mEnabled;
}
void clear() {
mLastPss = 0;
mState = STATE_OK;
}
}
/**
* Used for scheduling monitor callbacks and checking memory usage.
*/
final class HeartbeatHandler extends Handler {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case GLOBAL_PSS: {
if (mHaveGlobalPss) {
// During the last pass we collected pss information, so
// now it is time to report it.
mHaveGlobalPss = false;
if (localLOGV) Log.v(TAG, "Received global pss, logging.");
logGlobalMemory();
}
} break;
case MONITOR: {
if (mHavePss) {
// During the last pass we collected pss information, so
// now it is time to report it.
mHavePss = false;
if (localLOGV) Log.v(TAG, "Have pss, checking memory.");
checkMemory();
}
if (mHaveGlobalPss) {
// During the last pass we collected pss information, so
// now it is time to report it.
mHaveGlobalPss = false;
if (localLOGV) Log.v(TAG, "Have global pss, logging.");
logGlobalMemory();
}
long now = SystemClock.uptimeMillis();
// See if we should force a reboot.
int rebootInterval = mReqRebootInterval >= 0
? mReqRebootInterval : Settings.Gservices.getInt(
mResolver, Settings.Gservices.REBOOT_INTERVAL,
REBOOT_DEFAULT_INTERVAL);
if (mRebootInterval != rebootInterval) {
mRebootInterval = rebootInterval;
// We have been running long enough that a reboot can
// be considered...
checkReboot(false);
}
// See if we should check memory conditions.
long memCheckInterval = Settings.Gservices.getLong(
mResolver, Settings.Gservices.MEMCHECK_INTERVAL,
MEMCHECK_DEFAULT_INTERVAL) * 1000;
if ((mLastMemCheckTime+memCheckInterval) < now) {
// It is now time to collect pss information. This
// is async so we won't report it now. And to keep
// things simple, we will assume that everyone has
// reported back by the next MONITOR message.
mLastMemCheckTime = now;
if (localLOGV) Log.v(TAG, "Collecting memory usage.");
collectMemory();
mHavePss = true;
long memCheckRealtimeInterval = Settings.Gservices.getLong(
mResolver, Settings.Gservices.MEMCHECK_LOG_REALTIME_INTERVAL,
MEMCHECK_DEFAULT_LOG_REALTIME_INTERVAL) * 1000;
long realtimeNow = SystemClock.elapsedRealtime();
if ((mLastMemCheckRealtime+memCheckRealtimeInterval) < realtimeNow) {
mLastMemCheckRealtime = realtimeNow;
if (localLOGV) Log.v(TAG, "Collecting global memory usage.");
collectGlobalMemory();
mHaveGlobalPss = true;
}
}
final int size = mMonitors.size();
for (int i = 0 ; i < size ; i++) {
mCurrentMonitor = mMonitors.get(i);
mCurrentMonitor.monitor();
}
synchronized (Watchdog.this) {
mCompleted = true;
mCurrentMonitor = null;
}
} break;
}
}
}
final class GlobalPssCollected implements Runnable {
public void run() {
mHandler.sendEmptyMessage(GLOBAL_PSS);
}
}
final class CheckupReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context c, Intent intent) {
if (localLOGV) Log.v(TAG, "Alarm went off, checking memory.");
checkMemory();
}
}
final class RebootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context c, Intent intent) {
if (localLOGV) Log.v(TAG, "Alarm went off, checking reboot.");
checkReboot(true);
}
}
final class RebootRequestReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context c, Intent intent) {
mReqRebootNoWait = intent.getIntExtra("nowait", 0) != 0;
mReqRebootInterval = intent.getIntExtra("interval", -1);
mReqRebootStartTime = intent.getIntExtra("startTime", -1);
mReqRebootWindow = intent.getIntExtra("window", -1);
mReqMinScreenOff = intent.getIntExtra("minScreenOff", -1);
mReqMinNextAlarm = intent.getIntExtra("minNextAlarm", -1);
mReqRecheckInterval = intent.getIntExtra("recheckInterval", -1);
EventLog.writeEvent(EVENT_LOG_REQUESTED_REBOOT_TAG,
mReqRebootNoWait ? 1 : 0, mReqRebootInterval,
mReqRecheckInterval, mReqRebootStartTime,
mReqRebootWindow, mReqMinScreenOff, mReqMinNextAlarm);
checkReboot(true);
}
}
public interface Monitor {
void monitor();
}
public interface PssRequestor {
void requestPss();
}
public class PssStats {
public int mEmptyPss;
public int mEmptyCount;
public int mBackgroundPss;
public int mBackgroundCount;
public int mServicePss;
public int mServiceCount;
public int mVisiblePss;
public int mVisibleCount;
public int mForegroundPss;
public int mForegroundCount;
public int mNoPssCount;
public int mProcDeaths[] = new int[10];
}
public static Watchdog getInstance() {
if (sWatchdog == null) {
sWatchdog = new Watchdog();
}
return sWatchdog;
}
private Watchdog() {
super("watchdog");
mHandler = new HeartbeatHandler();
mGlobalPssCollected = new GlobalPssCollected();
}
public void init(Context context, BatteryService battery,
PowerManagerService power, AlarmManagerService alarm,
ActivityManagerService activity) {
mResolver = context.getContentResolver();
mBattery = battery;
mPower = power;
mAlarm = alarm;
mActivity = activity;
context.registerReceiver(new CheckupReceiver(),
new IntentFilter(CHECKUP_ACTION));
mCheckupIntent = PendingIntent.getBroadcast(context,
0, new Intent(CHECKUP_ACTION), 0);
context.registerReceiver(new RebootReceiver(),
new IntentFilter(REBOOT_ACTION));
mRebootIntent = PendingIntent.getBroadcast(context,
0, new Intent(REBOOT_ACTION), 0);
context.registerReceiver(new RebootRequestReceiver(),
new IntentFilter(Intent.ACTION_REBOOT),
android.Manifest.permission.REBOOT, null);
mBootTime = System.currentTimeMillis();
}
public void processStarted(PssRequestor req, String name, int pid) {
synchronized (this) {
if ("com.android.phone".equals(name)) {
mPhoneReq = req;
mPhonePid = pid;
mPhonePss = 0;
}
}
}
public void reportPss(PssRequestor req, String name, int pss) {
synchronized (this) {
if (mPhoneReq == req) {
mPhonePss = pss;
}
}
}
public void addMonitor(Monitor monitor) {
synchronized (this) {
if (isAlive()) {
throw new RuntimeException("Monitors can't be added while the Watchdog is running");
}
mMonitors.add(monitor);
}
}
/**
* Retrieve memory usage information from specific processes being
* monitored. This is an async operation, so must be done before doing
* memory checks.
*/
void collectMemory() {
synchronized (this) {
if (mPhoneReq != null) {
mPhoneReq.requestPss();
}
}
}
/**
* Retrieve memory usage over all application processes. This is an
* async operation, so must be done before doing memory checks.
*/
void collectGlobalMemory() {
mActivity.requestPss(mGlobalPssCollected);
}
/**
* Check memory usage in the system, scheduling kills/reboots as needed.
* This always runs on the mHandler thread.
*/
void checkMemory() {
boolean needScheduledCheck;
long curTime;
long nextTime = 0;
long recheckInterval = Settings.Gservices.getLong(
mResolver, Settings.Gservices.MEMCHECK_RECHECK_INTERVAL,
MEMCHECK_DEFAULT_RECHECK_INTERVAL) * 1000;
mSystemMemMonitor.retrieveSettings(mResolver);
mPhoneMemMonitor.retrieveSettings(mResolver);
retrieveBrutalityAmount();
synchronized (this) {
curTime = System.currentTimeMillis();
mNeedScheduledCheck = false;
// How is the system doing?
if (mSystemMemMonitor.checkLocked(curTime, Process.myPid(),
(int)Process.getPss(Process.myPid()))) {
// Not good! Time to suicide.
mForceKillSystem = true;
notifyAll();
return;
}
// How is the phone process doing?
if (mPhoneReq != null) {
if (mPhoneMemMonitor.checkLocked(curTime, mPhonePid,
mPhonePss)) {
// Just kill the phone process and let it restart.
Log.i(TAG, "Watchdog is killing the phone process");
Process.killProcess(mPhonePid);
}
} else {
mPhoneMemMonitor.clear();
}
needScheduledCheck = mNeedScheduledCheck;
if (needScheduledCheck) {
// Something is going bad, but now is not a good time to
// tear things down... schedule an alarm to check again soon.
nextTime = curTime + recheckInterval;
if (nextTime < mMemcheckExecStartTime) {
nextTime = mMemcheckExecStartTime;
} else if (nextTime >= mMemcheckExecEndTime){
// Need to check during next exec time... so that needs
// to be computed.
if (localLOGV) Log.v(TAG, "Computing next time range");
computeMemcheckTimesLocked(nextTime);
nextTime = mMemcheckExecStartTime;
}
if (localLOGV) {
mCalendar.setTimeInMillis(nextTime);
Log.v(TAG, "Next Alarm Time: " + mCalendar);
}
}
}
if (needScheduledCheck) {
if (localLOGV) Log.v(TAG, "Scheduling next memcheck alarm for "
+ ((nextTime-curTime)/1000/60) + "m from now");
mAlarm.remove(mCheckupIntent);
mAlarm.set(AlarmManager.RTC_WAKEUP, nextTime, mCheckupIntent);
} else {
if (localLOGV) Log.v(TAG, "No need to schedule a memcheck alarm!");
mAlarm.remove(mCheckupIntent);
}
}
final PssStats mPssStats = new PssStats();
final String[] mMemInfoFields = new String[] {
"MemFree:", "Buffers:", "Cached:",
"Active:", "Inactive:",
"AnonPages:", "Mapped:", "Slab:",
"SReclaimable:", "SUnreclaim:", "PageTables:" };
final long[] mMemInfoSizes = new long[mMemInfoFields.length];
final String[] mVMStatFields = new String[] {
"pgfree ", "pgactivate ", "pgdeactivate ",
"pgfault ", "pgmajfault " };
final long[] mVMStatSizes = new long[mVMStatFields.length];
final long[] mPrevVMStatSizes = new long[mVMStatFields.length];
long mLastLogGlobalMemoryTime;
void logGlobalMemory() {
PssStats stats = mPssStats;
mActivity.collectPss(stats);
EventLog.writeEvent(EVENT_LOG_PSS_STATS_TAG,
stats.mEmptyPss, stats.mEmptyCount,
stats.mBackgroundPss, stats.mBackgroundCount,
stats.mServicePss, stats.mServiceCount,
stats.mVisiblePss, stats.mVisibleCount,
stats.mForegroundPss, stats.mForegroundCount,
stats.mNoPssCount);
EventLog.writeEvent(EVENT_LOG_PROC_STATS_TAG,
stats.mProcDeaths[0], stats.mProcDeaths[1], stats.mProcDeaths[2],
stats.mProcDeaths[3], stats.mProcDeaths[4]);
Process.readProcLines("/proc/meminfo", mMemInfoFields, mMemInfoSizes);
for (int i=0; i<mMemInfoSizes.length; i++) {
mMemInfoSizes[i] *= 1024;
}
EventLog.writeEvent(EVENT_LOG_MEMINFO_TAG,
(int)mMemInfoSizes[0], (int)mMemInfoSizes[1], (int)mMemInfoSizes[2],
(int)mMemInfoSizes[3], (int)mMemInfoSizes[4],
(int)mMemInfoSizes[5], (int)mMemInfoSizes[6], (int)mMemInfoSizes[7],
(int)mMemInfoSizes[8], (int)mMemInfoSizes[9], (int)mMemInfoSizes[10]);
long now = SystemClock.uptimeMillis();
long dur = now - mLastLogGlobalMemoryTime;
mLastLogGlobalMemoryTime = now;
Process.readProcLines("/proc/vmstat", mVMStatFields, mVMStatSizes);
for (int i=0; i<mVMStatSizes.length; i++) {
long v = mVMStatSizes[i];
mVMStatSizes[i] -= mPrevVMStatSizes[i];
mPrevVMStatSizes[i] = v;
}
EventLog.writeEvent(EVENT_LOG_VMSTAT_TAG, dur,
(int)mVMStatSizes[0], (int)mVMStatSizes[1], (int)mVMStatSizes[2],
(int)mVMStatSizes[3], (int)mVMStatSizes[4]);
}
void checkReboot(boolean fromAlarm) {
int rebootInterval = mReqRebootInterval >= 0 ? mReqRebootInterval
: Settings.Gservices.getInt(
mResolver, Settings.Gservices.REBOOT_INTERVAL,
REBOOT_DEFAULT_INTERVAL);
mRebootInterval = rebootInterval;
if (rebootInterval <= 0) {
// No reboot interval requested.
if (localLOGV) Log.v(TAG, "No need to schedule a reboot alarm!");
mAlarm.remove(mRebootIntent);
return;
}
long rebootStartTime = mReqRebootStartTime >= 0 ? mReqRebootStartTime
: Settings.Gservices.getLong(
mResolver, Settings.Gservices.REBOOT_START_TIME,
REBOOT_DEFAULT_START_TIME);
long rebootWindowMillis = (mReqRebootWindow >= 0 ? mReqRebootWindow
: Settings.Gservices.getLong(
mResolver, Settings.Gservices.REBOOT_WINDOW,
REBOOT_DEFAULT_WINDOW)) * 1000;
long recheckInterval = (mReqRecheckInterval >= 0 ? mReqRecheckInterval
: Settings.Gservices.getLong(
mResolver, Settings.Gservices.MEMCHECK_RECHECK_INTERVAL,
MEMCHECK_DEFAULT_RECHECK_INTERVAL)) * 1000;
retrieveBrutalityAmount();
long realStartTime;
long now;
synchronized (this) {
now = System.currentTimeMillis();
realStartTime = computeCalendarTime(mCalendar, now,
rebootStartTime);
long rebootIntervalMillis = rebootInterval*24*60*60*1000;
if (DB || mReqRebootNoWait ||
(now-mBootTime) >= (rebootIntervalMillis-rebootWindowMillis)) {
if (fromAlarm && rebootWindowMillis <= 0) {
// No reboot window -- just immediately reboot.
EventLog.writeEvent(EVENT_LOG_SCHEDULED_REBOOT_TAG, now,
(int)rebootIntervalMillis, (int)rebootStartTime*1000,
(int)rebootWindowMillis, "");
rebootSystem("Checkin scheduled forced");
return;
}
// Are we within the reboot window?
if (now < realStartTime) {
// Schedule alarm for next check interval.
realStartTime = computeCalendarTime(mCalendar,
now, rebootStartTime);
} else if (now < (realStartTime+rebootWindowMillis)) {
String doit = shouldWeBeBrutalLocked(now);
EventLog.writeEvent(EVENT_LOG_SCHEDULED_REBOOT_TAG, now,
(int)rebootInterval, (int)rebootStartTime*1000,
(int)rebootWindowMillis, doit != null ? doit : "");
if (doit == null) {
rebootSystem("Checked scheduled range");
return;
}
// Schedule next alarm either within the window or in the
// next interval.
if ((now+recheckInterval) >= (realStartTime+rebootWindowMillis)) {
realStartTime = computeCalendarTime(mCalendar,
now + rebootIntervalMillis, rebootStartTime);
} else {
realStartTime = now + recheckInterval;
}
} else {
// Schedule alarm for next check interval.
realStartTime = computeCalendarTime(mCalendar,
now + rebootIntervalMillis, rebootStartTime);
}
}
}
if (localLOGV) Log.v(TAG, "Scheduling next reboot alarm for "
+ ((realStartTime-now)/1000/60) + "m from now");
mAlarm.remove(mRebootIntent);
mAlarm.set(AlarmManager.RTC_WAKEUP, realStartTime, mRebootIntent);
}
/**
* Perform a full reboot of the system.
*/
void rebootSystem(String reason) {
Log.i(TAG, "Rebooting system because: " + reason);
try {
android.os.Power.reboot(reason);
} catch (IOException e) {
Log.e(TAG, "Reboot failed!", e);
}
}
/**
* Load the current Gservices settings for when
* {@link #shouldWeBeBrutalLocked} will allow the brutality to happen.
* Must not be called with the lock held.
*/
void retrieveBrutalityAmount() {
mMinScreenOff = (mReqMinScreenOff >= 0 ? mReqMinScreenOff
: Settings.Gservices.getInt(
mResolver, Settings.Gservices.MEMCHECK_MIN_SCREEN_OFF,
MEMCHECK_DEFAULT_MIN_SCREEN_OFF)) * 1000;
mMinAlarm = (mReqMinNextAlarm >= 0 ? mReqMinNextAlarm
: Settings.Gservices.getInt(
mResolver, Settings.Gservices.MEMCHECK_MIN_ALARM,
MEMCHECK_DEFAULT_MIN_ALARM)) * 1000;
}
/**
* Determine whether it is a good time to kill, crash, or otherwise
* plunder the current situation for the overall long-term benefit of
* the world.
*
* @param curTime The current system time.
* @return Returns null if this is a good time, else a String with the
* text of why it is not a good time.
*/
String shouldWeBeBrutalLocked(long curTime) {
if (mBattery == null || !mBattery.isPowered()) {
return "battery";
}
if (mMinScreenOff >= 0 && (mPower == null ||
mPower.timeSinceScreenOn() < mMinScreenOff)) {
return "screen";
}
if (mMinAlarm >= 0 && (mAlarm == null ||
mAlarm.timeToNextAlarm() < mMinAlarm)) {
return "alarm";
}
return null;
}
/**
* Compute the times during which we next would like to perform process
* restarts.
*
* @param curTime The current system time.
*/
void computeMemcheckTimesLocked(long curTime) {
if (mMemcheckLastTime == curTime) {
return;
}
mMemcheckLastTime = curTime;
long memcheckExecStartTime = Settings.Gservices.getLong(
mResolver, Settings.Gservices.MEMCHECK_EXEC_START_TIME,
MEMCHECK_DEFAULT_EXEC_START_TIME);
long memcheckExecEndTime = Settings.Gservices.getLong(
mResolver, Settings.Gservices.MEMCHECK_EXEC_END_TIME,
MEMCHECK_DEFAULT_EXEC_END_TIME);
mMemcheckExecEndTime = computeCalendarTime(mCalendar, curTime,
memcheckExecEndTime);
if (mMemcheckExecEndTime < curTime) {
memcheckExecStartTime += 24*60*60;
memcheckExecEndTime += 24*60*60;
mMemcheckExecEndTime = computeCalendarTime(mCalendar, curTime,
memcheckExecEndTime);
}
mMemcheckExecStartTime = computeCalendarTime(mCalendar, curTime,
memcheckExecStartTime);
if (localLOGV) {
mCalendar.setTimeInMillis(curTime);
Log.v(TAG, "Current Time: " + mCalendar);
mCalendar.setTimeInMillis(mMemcheckExecStartTime);
Log.v(TAG, "Start Check Time: " + mCalendar);
mCalendar.setTimeInMillis(mMemcheckExecEndTime);
Log.v(TAG, "End Check Time: " + mCalendar);
}
}
static long computeCalendarTime(Calendar c, long curTime,
long secondsSinceMidnight) {
// start with now
c.setTimeInMillis(curTime);
int val = (int)secondsSinceMidnight / (60*60);
c.set(Calendar.HOUR_OF_DAY, val);
secondsSinceMidnight -= val * (60*60);
val = (int)secondsSinceMidnight / 60;
c.set(Calendar.MINUTE, val);
c.set(Calendar.SECOND, (int)secondsSinceMidnight - (val*60));
c.set(Calendar.MILLISECOND, 0);
long newTime = c.getTimeInMillis();
if (newTime < curTime) {
// The given time (in seconds since midnight) has already passed for today, so advance
// by one day (due to daylight savings, etc., the delta may differ from 24 hours).
c.add(Calendar.DAY_OF_MONTH, 1);
newTime = c.getTimeInMillis();
}
return newTime;
}
@Override
public void run() {
while (true) {
mCompleted = false;
mHandler.sendEmptyMessage(MONITOR);
synchronized (this) {
long timeout = TIME_TO_WAIT;
// NOTE: We use uptimeMillis() here because we do not want to increment the time we
// wait while asleep. If the device is asleep then the thing that we are waiting
// to timeout on is asleep as well and won't have a chance to run. Causing a false
// positive on when to kill things.
long start = SystemClock.uptimeMillis();
do {
try {
wait(timeout);
} catch (InterruptedException e) {
if (SystemProperties.getBoolean("ro.secure", false)) {
// If this is a secure build, just log the error.
Log.e("WatchDog", "Woof! Woof! Interrupter!");
} else {
throw new AssertionError("Someone interrupted the watchdog");
}
}
timeout = TIME_TO_WAIT - (SystemClock.uptimeMillis() - start);
} while (timeout > 0 && !mForceKillSystem);
if (mCompleted && !mForceKillSystem) {
// The monitors have returned.
continue;
}
}
// If we got here, that means that the system is most likely hung.
// First send a SIGQUIT so that we can see where it was hung. Then
// kill this process so that the system will restart.
String name = (mCurrentMonitor != null) ? mCurrentMonitor.getClass().getName() : "null";
EventLog.writeEvent(EVENT_LOG_TAG, name);
Process.sendSignal(Process.myPid(), Process.SIGNAL_QUIT);
// Wait a bit longer before killing so we can make sure that the stacks are captured.
try {
Thread.sleep(10*1000);
} catch (InterruptedException e) {
}
// Only kill the process if the debugger is not attached.
if (!Debug.isDebuggerConnected()) {
Log.i(TAG, "Watchdog is killing the system process");
Process.killProcess(Process.myPid());
}
}
}
}