1.1 Android reboot流程
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**思路： **执行到shutdown::run时，
a.设置Flag QuickShutdown=true
b.以广播通知系统一键加速清理进程，此时联网、影响用户体验、最经使用的TopN应用均需清理；
一键加速原理参考：
2.1 AMS::startProcessLocked
private final void startProcessLocked(ProcessRecord app, String hostingType,
String hostingNameStr, String abiOverride, String entryPoint, String[] entryPointArgs) {
if(QuickShutdown) return;
...
}
2.2 AMS::handleAppDiedLocked
/**
* Main function for removing an existing process from the activity manager
* as a result of that process going away. Clears out all connections
* to the process.
*/
private final void handleAppDiedLocked(ProcessRecord app,
boolean restarting, boolean allowRestart) {
if(QuickShutdown) { // 禁止Process重启
restarting = false;
allowRestart = false;
}
...
}
handleAppDiedLocked相关调用栈
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左边分支cleanUpApplicationRecordLocked用于清理死亡进程中运行的四大组件service, BroadcastReceiver, ContentProvider相关信息;
右边分支ASS.handleAppDiedLocked清理死亡进程中运行的activity相关信息
参考：
binder_died
2.3 AMS::killPackageProcessesLocked
private final boolean killPackageProcessesLocked(String packageName, int appId, int userId, int minOomAdj, boolean callerWillRestart, boolean allowRestart,
boolean doit, boolean evenPersistent, String reason) {
if (QuickShutdown) {
callerWillRestart = false;
allowRestart = false;
evenPersistent = true; //persistent 进程需清理
doit = true; //app.removed=true时，添加进程到procs中，procs中的进程将被removeProcessLocked
}
...
}
