I am seeing a need for a new watchdog mode that is similar to WDOG_MODE_KTICKLE but instead of the watchdog service function running from a callout it needs to run from a (higher level) hardware interrupt. I don't understand the use case. I am running watchdogs in user tickle, and consider the machine wedged if it can't run the tickle code in 30s. I have been thinking about going the other way, which is to add a disk argument to wdogctl for a 'disk-gated user tickle mode', where every time it wakes up it does lseek to a random block on the disk read it then do the tickle or perhaps do some sort of random find. The point is to reset when the system is functioning well enough that the user tickle runs but the system isn't really ok (like a tstile wedge, or a wedged disk controller).
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