目录
- 开机各个阶段描述
- boot_progress_start
- boot_progress_preload_start
- boot_progress_preload_end
- boot_progress_system_run
- boot_progress_pms_start
- boot_progress_pms_system_scan_start
- boot_progress_pms_data_scan_start
- boot_progress_pms_scan_end
- boot_progress_pms_ready
- boot_progress_ams_ready
- boot_progress_enable_screen
- sf_stop_bootanim
- wm_boot_animation_done
开机各个阶段描述
| 阶段 | 描述 |
|---|---|
| boot_progress_start | 系统进入用户空间，标志着kernel启动完成 |
| boot_progress_preload_start | Zygote启动 |
| boot_progress_preload_end | Zygote结束 |
| boot_progress_system_run | SystemServer ready,开始启动Android系统服务 |
| boot_progress_pms_start | PMS开始扫描安装的应用 |
| boot_progress_pms_system_scan_start | PMS先行扫描/system目录下的安装包 |
| boot_progress_pms_data_scan_start | PMS扫描/data目录下的安装包 |
| boot_progress_pms_scan_end | PMS扫描结束 |
| boot_progress_pms_ready | PMS就绪 |
| boot_progress_ams_ready | AMS就绪 |
| boot_progress_enable_screen | AMS启动完成后开始激活屏幕，从此以后屏幕才能响应用户的触摸，它在WindowManagerService发出退出开机动画的时间节点之前 |
| sf_stop_bootanim | SF设置service.bootanim.exit属性值为1，标志系统要结束开机动画了 |
| wm_boot_animation_done | 开机动画结束，这一步用户能直观感受到开机结束 |
boot_progress_start
frameworks/base/core/jni/AndroidRuntime.cpp
void AndroidRuntime::start(const char* className, const Vector<String8>& options, bool zygote)
{
...
/*
* 'startSystemServer == true' means runtime is obsolete and not run from
* init.rc anymore, so we print out the boot start event here.
*/
for (size_t i = 0; i < options.size(); ++i) {
if (options[i] == startSystemServer) {
primary_zygote = true;
/* track our progress through the boot sequence */
const int LOG_BOOT_PROGRESS_START = 3000;
LOG_EVENT_LONG(LOG_BOOT_PROGRESS_START, ns2ms(systemTime(SYSTEM_TIME_MONOTONIC)));
}
}
...
}
boot_progress_preload_start
boot_progress_preload_end
boot_progress_system_run
frameworks/base/services/java/com/android/server/SystemServer.java
private void run() {
...
// Here we go!
Slog.i(TAG, "Entered the Android system server!");
final long uptimeMillis = SystemClock.elapsedRealtime();
EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_SYSTEM_RUN, uptimeMillis);
if (!mRuntimeRestart) {
FrameworkStatsLog.write(FrameworkStatsLog.BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
FrameworkStatsLog
.BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__SYSTEM_SERVER_INIT_START,
uptimeMillis);
}
...
}
boot_progress_pms_start
frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java
public PackageManagerService(Injector injector, boolean onlyCore, boolean factoryTest) {
...
mInjector = injector;
mInjector.bootstrap(this);
mLock = injector.getLock();
mInstallLock = injector.getInstallLock();
LockGuard.installLock(mLock, LockGuard.INDEX_PACKAGES);
EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_START,
SystemClock.uptimeMillis());
...
}
boot_progress_pms_system_scan_start
frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java
public PackageManagerService(Injector injector, boolean onlyCore, boolean factoryTest) {
...
long startTime = SystemClock.uptimeMillis();
EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SYSTEM_SCAN_START,
startTime);
final String bootClassPath = System.getenv("BOOTCLASSPATH");
final String systemServerClassPath = System.getenv("SYSTEMSERVERCLASSPATH");
if (bootClassPath == null) {
Slog.w(TAG, "No BOOTCLASSPATH found!");
}
if (systemServerClassPath == null) {
Slog.w(TAG, "No SYSTEMSERVERCLASSPATH found!");
}
...
}
boot_progress_pms_data_scan_start
frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java
public PackageManagerService(Injector injector, boolean onlyCore, boolean factoryTest) {
...
// Remove any shared userIDs that have no associated packages
mSettings.pruneSharedUsersLPw();
final long systemScanTime = SystemClock.uptimeMillis() - startTime;
final int systemPackagesCount = mPackages.size();
Slog.i(TAG, "Finished scanning system apps. Time: " + systemScanTime
+ " ms, packageCount: " + systemPackagesCount
+ " , timePerPackage: "
+ (systemPackagesCount == 0 ? 0 : systemScanTime / systemPackagesCount)
+ " , cached: " + cachedSystemApps);
if (mIsUpgrade && systemPackagesCount > 0) {
//CHECKSTYLE:OFF IndentationCheck
FrameworkStatsLog.write(FrameworkStatsLog.BOOT_TIME_EVENT_DURATION_REPORTED,
BOOT_TIME_EVENT_DURATION__EVENT__OTA_PACKAGE_MANAGER_SYSTEM_APP_AVG_SCAN_TIME,
systemScanTime / systemPackagesCount);
//CHECKSTYLE:ON IndentationCheck
}
if (!mOnlyCore) {
EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_DATA_SCAN_START,
SystemClock.uptimeMillis());
scanDirTracedLI(sAppInstallDir, 0, scanFlags | SCAN_REQUIRE_KNOWN, 0,
packageParser, executorService);
}
...
}
boot_progress_pms_scan_end
frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java
public PackageManagerService(Injector injector, boolean onlyCore, boolean factoryTest) {
...
// Now that we know all the packages we are keeping,
// read and update their last usage times.
mPackageUsage.read(mSettings.mPackages);
mCompilerStats.read();
EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SCAN_END,
SystemClock.uptimeMillis());
Slog.i(TAG, "Time to scan packages: "
+ ((SystemClock.uptimeMillis()-startTime)/1000f)
+ " seconds");
...
}
boot_progress_pms_ready
frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java
public PackageManagerService(Injector injector, boolean onlyCore, boolean factoryTest) {
...
// can downgrade to reader
t.traceBegin("write settings");
mSettings.writeLPr();
t.traceEnd();
EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_READY,
SystemClock.uptimeMillis());
...
}
boot_progress_ams_ready
frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
public void systemReady(final Runnable goingCallback, @NonNull TimingsTraceAndSlog t) {
...****
t.traceEnd(); // KillProcesses
Slog.i(TAG, "System now ready");
EventLogTags.writeBootProgressAmsReady(SystemClock.uptimeMillis());
t.traceBegin("updateTopComponentForFactoryTest");
mAtmInternal.updateTopComponentForFactoryTest();
t.traceEnd();
...
}
boot_progress_enable_screen
frameworks/base/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
@Override
public void enableScreenAfterBoot(boolean booted) {
writeBootProgressEnableScreen(SystemClock.uptimeMillis());
mWindowManager.enableScreenAfterBoot();
synchronized (mGlobalLock) {
updateEventDispatchingLocked(booted);
}
}
sf_stop_bootanim
frameworks/native/services/surfaceflinger/SurfaceFlinger.cpp
void SurfaceFlinger::bootFinished()
{
...
// stop boot animation
// formerly we would just kill the process, but we now ask it to exit so it
// can choose where to stop the animation.
property_set("service.bootanim.exit", "1");
const int LOGTAG_SF_STOP_BOOTANIM = 60110;
LOG_EVENT_LONG(LOGTAG_SF_STOP_BOOTANIM,
ns2ms(systemTime(SYSTEM_TIME_MONOTONIC)));
sp<IBinder> input(defaultServiceManager()->getService(String16("inputflinger")));
...
}
wm_boot_animation_done
frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
private void performEnableScreen() {
...
try {
IBinder surfaceFlinger = ServiceManager.getService("SurfaceFlinger");
if (surfaceFlinger != null) {
ProtoLog.i(WM_ERROR, "******* TELLING SURFACE FLINGER WE ARE BOOTED!");
Parcel data = Parcel.obtain();
data.writeInterfaceToken("android.ui.ISurfaceComposer");
surfaceFlinger.transact(IBinder.FIRST_CALL_TRANSACTION, // BOOT_FINISHED
data, null, 0);
data.recycle();
}
} catch (RemoteException ex) {
ProtoLog.e(WM_ERROR, "Boot completed: SurfaceFlinger is dead!");
}
EventLogTags.writeWmBootAnimationDone(SystemClock.uptimeMillis());
Trace.asyncTraceEnd(TRACE_TAG_WINDOW_MANAGER, "Stop bootanim", 0);
mDisplayEnabled = true;
ProtoLog.i(WM_DEBUG_SCREEN_ON, "******************** ENABLING SCREEN!");
...
}