如上篇所述,当调用Watchdog#start方法时,启动其内部工作线程,之后它的run方法会被调用,Watchdog在此线程中执行监控逻辑。 Watchdog的工作概述如下: CHECK_INTERVAL(目前是30s)周期遍历HandlerChecker列表的所有元素,调用HandlerChecker#scheduleCheckLocked方法来执行检测操作,具体实现是向对应HandlerChecker的Handler中post一...
WATCH DOG TIMER ;=== WTCON EQU 0x53000000 ;Watch-dog timer mode WTDAT EQU 0x53000004 ;Watch-dog timer data WTCNT EQU 0x53000008 ;Eatch-dog timer count ;=== ; IIC ;=== IICCON EQU 0x54000000 ;IIC control IICSTAT EQU 0x54000004 ;IIC status IICADD EQU 0x54000008 ;IIC address ...
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Watchdog.getInstance().addThread(mHandler); } 1. 2. 3. 4. 5. 6. 可以看到PowerManagerService 将自己作为接口注册到了watchdog,同时还传入了自己的handler。 至此,我们知道了Monitor其实是watchdog对被检测者的抽象,由被检测者自己来实现该接口,以定义需要被检测的内容,从而达到设计模式所说的依赖倒置。 接...
10*1000:60*1000;staticfinal longCHECK_INTERVAL=DEFAULT_TIMEOUT/2;//这两个变量非常重要,由于DB为false,所以DEFAULT_TIMEOUT为60秒,//主要线程blocked了60秒,watchdog就会去kill进程systemServer。//CHECK_INTERVAL为30秒,意思是每隔30秒去check一次}
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soft lock detector检查时间戳,如果超过soft lockup threshold一直未更新,说明[watchdog/x]未得到运行机会,意味着CPU被霸占,也就是发生了soft lockup。 2.基于PMU的NMI perf event,当PMU的计数器溢出时会触发NMI中断,对应的中断处理例程是 kernel/watchdog.c: watchdog_overflow_callback(),hard lockup detector...
我们先把systemServer使用watchdog的调用流程总结一下,然后以此为切入点来分析watchdog。SS和watchdog的交互流程可以总结如下: ①watchdog.getInstance.Init() ②watchdog.getInstance.start() ③watchdog.getInstance.addMonitor() 1.1 创建和初始化watchdog
softdog_keepalive(); } clear_bit(0, &driver_open); expect_close = 0; return 0; } static ssize_t softdog_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { /* * Refresh the timer. */ if (len) { if (!nowayout) { size_t i; /* In case ...
(self.__tid)):try:_thread.stack_size(0x1000)self.__tid=_thread.start_new_thread(self.__check,())exceptExceptionase:sys.print_exception(e)defstop(self):ifself.__tid:try:_thread.stop_thread(self.__tid)except:passself.__tid=Nonewdt=WatchDog(5)# initialize the software watchdogdefth_...