Moscow Water Dog: Like the Moscow watchdog, the Moscow water dog has the Caucasian Ovcharka (Caucasian Shepherd Dog) as one of its ancestors. It is also called the Moscow Retriever. Moscow Watchdog vs Caucasian Ovcharka The Moscow watchdog has the beauty, size, and intelligence of the St...
#define WDIOC_GETSTATUS _IOR(WATCHDOG_IOCTL_BASE, 1, int) #define WDIOC_GETBOOTSTATUS _IOR(WATCHDOG_IOCTL_BASE, 2, int) #define WDIOC_GETTEMP _IOR(WATCHDOG_IOCTL_BASE, 3, int) #define WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, 4, int) #define WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_...
S3C2410内部集成了watchdog,提供3 个寄存器对watchdog 进行操作,这3 个寄存器分别为WTCON (watchdog 控制寄存器)、WTDAT (watchdog 数据寄存器)和WTCNT(watchdog 记数寄存器) S3c2440的看门狗的原理框图如下: 可以看到,看门狗定时器的频率由PCLK提供,其预分频器最大取值为255+1;另外,通过MUX,可以进一步降低频率。...
2.3 Watchdog的监测机制 Watchdog本身是一个线程,它的run()方法实现如下: @Overridepublicvoidrun(){booleanwaitedHalf=false;while(true) { ...synchronized(this) { ...// 1. 调度所有的HandlerCheckerfor(inti=0; i<mHandlerCheckers.size(); i++) {HandlerCheckerhc=mHandlerCheckers.get(i); hc.sched...
Watch Dog的中文意思是“看门狗”,最初是应用子啊嵌入式设备上的,目的是为了防止程序跑飞,所以专门设置了一个硬件看门狗,每隔一段时间,看门狗就会去检查一下某个参数是不是被设置了,如果发现该参数设置出错,就会强制重启程序。 二、在Android上的应用 Android对SystemServer参数是否被设置时很谨慎的,所以专门为它增加...
publicvoidrun(){boolean waitedHalf=false;while(true){final ArrayList<HandlerChecker>blockedCheckers;final String subject;final boolean allowRestart;int debuggerWasConnected=0;synchronized(this){long timeout=CHECK_INTERVAL;//CHECK_INTERVAL=30sfor(int i=0;i<mHandlerCheckers.size();i++){HandlerChecker...
(mMonitors.size()==0&&mHandler.getLooper().getQueue().isPolling()){109// If the target looper has recently been polling, then110// there is no reason to enqueue our checker on it since that111// is as good as it not being deadlocked. This avoid having112// to do a context ...
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int size; DBG("%s: probe=%p\n", __func__, pdev); dev = &pdev->dev; wdt_dev = &pdev->dev; /* get the memory region for the watchdog timer */ /*获取平台资源,寄存器地址范围*/ res = platform_get_resource(pdev, IORESOURCE_MEM,0); ...
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...