唤醒现象

唤醒时刻 09:29

唤醒时刻 09:36

唤醒时刻 09:46

唤醒时刻 10:00

唤醒分析

AlarmManager android 的定时 ELAPSED_REALTIME 唤醒

设置定时器-下一个触发时刻为 131217611-29 09:26:23.088195   973   973 V AlarmManager: APP set(PendingIntent{d853147: PendingIntentRecord{aa3cd74 android broadcastIntent}}) : type=3 triggerAtTime=1312176 win=0 tElapsed=1312176 maxElapsed=1312176 interval=0 flags=0x1定时器触发 1312176，故台阶波形产生11-29 09:29:33.090926   973  1213 V AlarmManager: sending alarm Alarm{fb53c89 type 3 when 1312176 android} success设置定时器-下一个触发时刻为 149217511-29 09:29:33.094564   973   973 V AlarmManager: APP set(PendingIntent{d853147: PendingIntentRecord{aa3cd74 android broadcastIntent}}) : type=3 triggerAtTime=1492175 win=0 tElapsed=1492175 maxElapsed=1492175 interval=0 flags=0x111-29 09:29:33.094939   973   973 D AlarmManager: set alarm to RTC 1492175 Type: 3定时器触发 1492175，故台阶波形产生11-29 09:36:22.099205   973  1213 V AlarmManager: sending alarm Alarm{c4e54af type 3 when 1492175 android} success设置定时器-下一个触发时刻为 191217511-29 09:36:22.112267   973   973 V AlarmManager: APP set(PendingIntent{d853147: PendingIntentRecord{aa3cd74 android broadcastIntent}}) : type=3 triggerAtTime=1912175 win=0 tElapsed=1912175 maxElapsed=1912175 interval=0 flags=0x111-29 09:36:22.112592   973   973 D AlarmManager: set alarm to RTC 1912175 Type: 3定时器触发 1912175，故台阶波形产生11-29 09:46:23.087939   973  1213 V AlarmManager: sending alarm Alarm{1b58ccb type 3 when 1912175 android} success设置定时器-下一个触发时刻为 251217611-29 09:46:23.098627   973   973 V AlarmManager: APP set(PendingIntent{d853147: PendingIntentRecord{aa3cd74 android broadcastIntent}}) : type=3 triggerAtTime=2512176 win=0 tElapsed=2512176 maxElapsed=2512176 interval=0 flags=0x111-29 09:46:23.099062   973   973 D AlarmManager: set alarm to RTC 2512176 Type: 3定时器触发 2512176，故台阶波形产生11-29 10:00:01.093812   973  1213 V AlarmManager: sending alarm Alarm{c7af3c1 type 3 when 2512176 android} success设置定时器-下一个触发时刻为 335217611-29 10:00:01.098752   973   973 V AlarmManager: APP set(PendingIntent{d853147: PendingIntentRecord{aa3cd74 android broadcastIntent}}) : type=3 triggerAtTime=3352176 win=0 tElapsed=3352176 maxElapsed=3352176 interval=0 flags=0x111-29 10:00:01.099113   973   973 D AlarmManager: set alarm to RTC 3352176 Type: 3定时器触发 3352176，但是波形图不是 10:11 而是 10 ：0511-29 10:11:54.766607   973   973 V AlarmManager: sending alarm Alarm{22c0f4a type 3 when 3352176 android} success

DeviceIdleController.light 定时器 ELAPSED_REALTIME_WAKEUP 唤醒

DeviceIdleController.light 设置定时器-下一个触发时刻为 146410211-29 09:24:31.927   973   973 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=1464102 win=-1 tElapsed=1464102 maxElapsed=1689101 interval=0 flags=0x811-29 09:26:23.078   973  1213 D AlarmManager: set alarm to RTC 1464102 Type: 2定时器触发 1464102，故台阶波形产生，且满足波形图时间11-29 09:29:33.093   973  1213 D AlarmManager: wakeup alarm = Alarm{392b48e type 2 when 1464102 android}; listener package = DeviceIdleController.lightneedGrouping = falseDeviceIdleController.light 设置定时器-下一个触发时刻为 176526911-29 09:29:33.111   973  1003 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=1765269 win=-1 tElapsed=1765269 maxElapsed=1990269 interval=0 flags=0x8定时器触发 1765269，故台阶波形产生，且满足波形图时间11-29 09:36:22.102   973  1213 D AlarmManager: wakeup alarm = Alarm{98190bc type 2 when 1765269 android}; listener package = DeviceIdleController.lightneedGrouping = falseDeviceIdleController.light 设置定时器-下一个触发时刻为 247427911-29 09:36:22.110   973  1003 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=2474279 win=-1 tElapsed=2474279 maxElapsed=2924273 interval=0 flags=0x811-29 09:36:22.111   973  1003 D AlarmManager: set alarm to RTC 2474279 Type: 2DeviceIdleController.light 设置定时器-下一个触发时刻为 253526911-29 09:46:23.094   973  1003 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=2535269 win=-1 tElapsed=2535269 maxElapsed=2580268 interval=0 flags=0x811-29 09:46:23.098   973  1003 D AlarmManager: set alarm to RTC 2535269 Type: 2DeviceIdleController.light 设置定时器-下一个触发时刻为 308048711-29 09:46:28.312   973  1003 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=3080487 win=-1 tElapsed=3080487 maxElapsed=3530487 interval=0 flags=0x8定时器触发 3080487，故台阶波形产生，且满足波形图时间11-29 10:00:01.094   973  1213 D AlarmManager: wakeup alarm = Alarm{ee4c766 type 2 when 3080487 android}; listener package = DeviceIdleController.lightneedGrouping = falseDeviceIdleController.light 设置定时器-下一个触发时刻为 419332011-29 10:00:01.145   973  1003 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=4193320 win=-1 tElapsed=4193320 maxElapsed=4868320 interval=0 flags=0x811-29 10:00:01.146   973  1003 D AlarmManager: set alarm to RTC 4193320 Type: 2

题外-定时器类型

83public class AlarmManager {84    private static final String TAG = "AlarmManager";8586    /**87     * Alarm time in {@link System#currentTimeMillis System.currentTimeMillis()}88     * (wall clock time in UTC), which will wake up the device when89     * it goes off.90     */91    public static final int RTC_WAKEUP = 0;92    /**93     * Alarm time in {@link System#currentTimeMillis System.currentTimeMillis()}94     * (wall clock time in UTC).  This alarm does not wake the95     * device up; if it goes off while the device is asleep, it will not be96     * delivered until the next time the device wakes up.97     */98    public static final int RTC = 1;99    /**100     * Alarm time in {@link android.os.SystemClock#elapsedRealtime101     * SystemClock.elapsedRealtime()} (time since boot, including sleep),102     * which will wake up the device when it goes off.103     */104    public static final int ELAPSED_REALTIME_WAKEUP = 2;105    /**106     * Alarm time in {@link android.os.SystemClock#elapsedRealtime107     * SystemClock.elapsedRealtime()} (time since boot, including sleep).108     * This alarm does not wake the device up; if it goes off while the device109     * is asleep, it will not be delivered until the next time the device110     * wakes up.111     */112    public static final int ELAPSED_REALTIME = 3

源码分析

定时器相关源码

/frameworks/base/services/core/java/com/android/server/AlarmManagerService.java

void setImpl(int type, long triggerAtTime, long windowLength, long interval,            PendingIntent operation, IAlarmListener directReceiver, String listenerTag,            int flags, WorkSource workSource, AlarmManager.AlarmClockInfo alarmClock,            int callingUid, String callingPackage) {        synchronized (mLock) {            if (true) {                if (operation == null) {                    Slog.v(TAG, "APP set with listener(" + listenerTag + ") : type=" + type                        + " triggerAtTime=" + triggerAtTime + " win=" + windowLength                        + " tElapsed=" + triggerElapsed + " maxElapsed=" + maxElapsed                        + " interval=" + interval + " flags=0x" + Integer.toHexString(flags));                } else {                    Slog.v(TAG, "APP set(" + operation + ") : type=" + type                        + " triggerAtTime=" + triggerAtTime + " win=" + windowLength                        + " tElapsed=" + triggerElapsed + " maxElapsed=" + maxElapsed                        + " interval=" + interval + " flags=0x" + Integer.toHexString(flags));                }            }            setImplLocked(type, triggerAtTime, triggerElapsed, windowLength, maxElapsed,                    interval, operation, directReceiver, listenerTag, flags, true, workSource,                    alarmClock, callingUid, callingPackage, mNeedGrouping);        }

DeviceIdleController 设置定时

frameworks\base\services\core\java\com\android\server\DeviceIdleController.java

package com.android.server;/** * Keeps track of device idleness and drives low power mode based on that. */public class DeviceIdleController extends SystemService        implements AnyMotionDetector.DeviceIdleCallback {
       void scheduleLightAlarmLocked(long delay) {        if (DEBUG) Slog.d(TAG, "scheduleLightAlarmLocked(" + delay + ")");        mNextLightAlarmTime = SystemClock.elapsedRealtime() + delay;        mAlarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,                mNextLightAlarmTime, "DeviceIdleController.light", mLightAlarmListener, mHandler);    }

源码修改

我们可以延长 IDLE 模式的驻留时间，单位时间内减少其LIGHT_STATE_IDLE to LIGHT_STATE_IDLE_MAINTENANCE或LIGHT_WAITING_FOR_NETWORK的次数，优化电池

package com.android.server;/** * Keeps track of device idleness and drives low power mode based on that. */public class DeviceIdleController extends SystemService        implements AnyMotionDetector.DeviceIdleCallback {
           private static final boolean DEBUG = true;                // LIGHT_IDLE 的驻留时间是 [15, 30]分钟                // suhuazhi,20171220, for extend duration of idle                LIGHT_IDLE_TIMEOUT = mParser.getLong(KEY_LIGHT_IDLE_TIMEOUT,                        !COMPRESS_TIME ? 15 * 60 * 1000L : 15 * 1000L);                LIGHT_IDLE_FACTOR = mParser.getFloat(KEY_LIGHT_IDLE_FACTOR,                        3f);                LIGHT_MAX_IDLE_TIMEOUT = mParser.getLong(KEY_LIGHT_MAX_IDLE_TIMEOUT,                        !COMPRESS_TIME ? 30 * 60 * 1000L : 60 * 1000L);                // end if=======================================================================================// 原来的 LIGHT_IDLE 的驻留时间是 [5, 15]分钟                LIGHT_IDLE_TIMEOUT = mParser.getLong(KEY_LIGHT_IDLE_TIMEOUT,                        !COMPRESS_TIME ? 5 * 60 * 1000L : 15 * 1000L);                LIGHT_IDLE_FACTOR = mParser.getFloat(KEY_LIGHT_IDLE_FACTOR,                        2f);                LIGHT_MAX_IDLE_TIMEOUT = mParser.getLong(KEY_LIGHT_MAX_IDLE_TIMEOUT,                        !COMPRESS_TIME ? 15 * 60 * 1000L : 60 * 1000L);

延长对应的延长 IDLE 模式的驻留时间

======================================================================        switch (mLightState) {            case LIGHT_STATE_INACTIVE:                // Reset the upcoming idle delays.                mNextLightIdleDelay = mConstants.LIGHT_IDLE_TIMEOUT;                 break;            case LIGHT_STATE_PRE_IDLE:            case LIGHT_STATE_IDLE_MAINTENANCE:                .......                scheduleLightAlarmLocked(mNextLightIdleDelay);                mNextLightIdleDelay = Math.min(mConstants.LIGHT_MAX_IDLE_TIMEOUT,                        (long)(mNextLightIdleDelay * mConstants.LIGHT_IDLE_FACTOR));                if (mNextLightIdleDelay < mConstants.LIGHT_IDLE_TIMEOUT) {                    mNextLightIdleDelay = mConstants.LIGHT_IDLE_TIMEOUT;                }                .....                if (DEBUG) Slog.d(TAG, "Moved to LIGHT_STATE_IDLE. mNextLightIdleDelay = " + mNextLightIdleDelay);                mLightState = LIGHT_STATE_IDLE;                break;            case LIGHT_STATE_WAITING_FOR_NETWORK:                if (mNetworkConnected || mLightState == LIGHT_STATE_WAITING_FOR_NETWORK) {                } else {                    // We'd like to do maintenance, but currently don't have network                    // connectivity...  let's try to wait until the network comes back.                    // We'll only wait for another full idle period, however, and then give up.                    scheduleLightAlarmLocked(mNextLightIdleDelay);                    if (DEBUG) Slog.d(TAG, "Moved to LIGHT_WAITING_FOR_NETWORK. mNextLightIdleDelay = " + mNextLightIdleDelay);                    mLightState = LIGHT_STATE_WAITING_FOR_NETWORK;                }======================================================================

优化效果

优化前数据

Doze的状态切换

3,108: 11-29 14:59:18.953134   964   964 D DeviceIdleController: Moved from STATE_ACTIVE to STATE_INACTIVE 3,111: 11-29 14:59:18.953422   964   964 D DeviceIdleController: Moved from LIGHT_STATE_ACTIVE to LIGHT_STATE_INACTIVE 3,197: 11-29 15:04:20.131240   964   992 D DeviceIdleController: Moved to LIGHT_STATE_IDLE. <5分钟间隔>3,229: 11-29 15:09:21.098920   964   992 D DeviceIdleController: Moved to LIGHT_WAITING_FOR_NETWORK. <15分钟间隔>3,262: 11-29 15:26:07.132630   964   992 D DeviceIdleController: Moved from LIGHT_STATE_IDLE to LIGHT_STATE_IDLE_MAINTENANCE. 3,276: 11-29 15:26:12.319049   964   992 D DeviceIdleController: Moved to LIGHT_STATE_IDLE. <10分钟间隔>3,314: 11-29 15:36:13.122641   964   992 D DeviceIdleController: Moved to LIGHT_WAITING_FOR_NETWORK. <15分钟间隔>3,331: 11-29 15:51:14.110387   964   992 D DeviceIdleController: Moved from LIGHT_STATE_IDLE to LIGHT_STATE_IDLE_MAINTENANCE. 3,353: 11-29 15:51:19.297282   964   992 D DeviceIdleController: Moved to LIGHT_STATE_IDLE. <20分钟间隔>3,419: 11-29 16:10:21.125400   964   992 D DeviceIdleController: Moved to LIGHT_WAITING_FOR_NETWORK. <15分钟间隔>3,455: 11-29 16:26:07.140463   964   992 D DeviceIdleController: Moved from LIGHT_STATE_IDLE to LIGHT_STATE_IDLE_MAINTENANCE. 3,469: 11-29 16:26:12.304652   964   992 D DeviceIdleController: Moved to LIGHT_STATE_IDLE.

唤醒时间间隔
总时长 1小时半

3,113: 11-29 14:59:18.953767   964   964 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=565319 win=-1 tElapsed=565319 maxElapsed=790319 interval=0 flags=0x8 3,193: 11-29 15:04:20.104443   964   992 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=866461 win=-1 tElapsed=866461 maxElapsed=1091461 interval=0 flags=0x8 <5分钟间隔>3,228: 11-29 15:09:21.098108   964   992 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=1467463 win=-1 tElapsed=1467463 maxElapsed=1917463 interval=0 flags=0x8 <15分钟间隔>3,254: 11-29 15:26:07.126923   964   992 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=1933461 win=-1 tElapsed=1933461 maxElapsed=1978461 interval=0 flags=0x8 3,272: 11-29 15:26:12.313214   964   992 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=2478678 win=-1 tElapsed=2478678 maxElapsed=2928678 interval=0 flags=0x8 <10分钟间隔>3,312: 11-29 15:36:13.120175   964   992 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=3379485 win=-1 tElapsed=3379485 maxElapsed=4054485 interval=0 flags=0x8 <15分钟间隔>3,329: 11-29 15:51:14.105569   964   992 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=3495252 win=-1 tElapsed=3495252 maxElapsed=3581337 interval=0 flags=0x8 3,350: 11-29 15:51:19.291767   964   992 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=4285656 win=-1 tElapsed=4285656 maxElapsed=4960656 interval=0 flags=0x8 <20分钟间隔>3,416: 11-29 16:10:21.116175   964   992 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=5427480 win=-1 tElapsed=5427480 maxElapsed=6102480 interval=0 flags=0x8 <15分钟间隔>3,447: 11-29 16:26:07.128173   964   992 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=5643059 win=-1 tElapsed=5643059 maxElapsed=5770233 interval=0 flags=0x8 3,465: 11-29 16:26:12.299088   964   992 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=6378664 win=-1 tElapsed=6378664 maxElapsed=7053664 interval=0 flags=0x8

优化后数据，预计拉长上述的时间间隔

Doze的状态切换

2,041: 01-01 02:30:51.073802   977   977 D DeviceIdleController: Moved from STATE_ACTIVE to STATE_INACTIVE 2,044: 01-01 02:30:51.074208   977   977 D DeviceIdleController: Moved from LIGHT_STATE_ACTIVE to LIGHT_STATE_INACTIVE 2,866: 12-29 18:42:10.965973   977   977 D DeviceIdleController: Moved from STATE_ACTIVE to STATE_INACTIVE 2,869: 12-29 18:42:10.966274   977   977 D DeviceIdleController: Moved from LIGHT_STATE_ACTIVE to LIGHT_STATE_INACTIVE <5分钟间隔>2,934: 12-29 18:47:12.144441   977  1005 D DeviceIdleController: Moved to scheduleLightAlarmLocked mNextLightIdleDelay 900000 2,935: 12-29 18:47:12.144598   977  1005 D DeviceIdleController: Moved to LIGHT_STATE_IDLE. mNextLightIdleDelay 1800000 <15分钟间隔>2,980: 12-29 19:02:13.117638   977  1005 D DeviceIdleController: Moved to LIGHT_WAITING_FOR_NETWORK. mNextLightIdleDelay = 1800000 <30分钟间隔>3,015: 12-29 19:32:14.151051   977  1005 D DeviceIdleController: Moved from LIGHT_STATE_IDLE to LIGHT_STATE_IDLE_MAINTENANCE. 3,033: 12-29 19:32:19.319212   977  1005 D DeviceIdleController: Moved to scheduleLightAlarmLocked mNextLightIdleDelay 1800000 3,034: 12-29 19:32:19.319374   977  1005 D DeviceIdleController: Moved to LIGHT_STATE_IDLE. mNextLightIdleDelay 1800000

唤醒时间间隔

2,871: 12-29 18:42:10.966672   977   977 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=3887071 win=-1 tElapsed=3887071 maxElapsed=4112071 interval=0 flags=0x8 <5分钟间隔>2,931: 12-29 18:47:12.133963   977  1005 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=4788238 win=-1 tElapsed=4788238 maxElapsed=5463238 interval=0 flags=0x8 <15分钟间隔>2,978: 12-29 19:02:13.103318   977  1005 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=6589207 win=-1 tElapsed=6589207 maxElapsed=7939207 interval=0 flags=0x8 <30分钟间隔>3,013: 12-29 19:32:14.149906   977  1005 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=6650253 win=-1 tElapsed=6650253 maxElapsed=6695252 interval=0 flags=0x8 3,030: 12-29 19:32:19.313706   977  1005 V AlarmManager: APP set with listener(DeviceIdleController.light) : type=2 triggerAtTime=8395418 win=-1 tElapsed=8395418 maxElapsed=9745418 interval=0 flags=0x8

优化后，相同时长下，唤醒次数少了一半，且主要是拉长LIGHT_STATE_IDLE待机的驻留期，让LIGHT_WAITING_FOR_NETWORK和LIGHT_STATE_IDLE_MAINTENANCE的状态少一些刷新

但是又不对有网络下的MAINTENANCE造成太大影响

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