On 6/16/20 9:37 AM, Corey Minyard wrote: > Hi, > > I'm representing the Elisa group, an organization working on making it > easier to use Linux in safety critical applications. > > As part of this, one thing we need is a watchdog that has a much finer > granularity than one second. In some applications, that is just too > long. > > Would the watchdog maintainers be ameniable to changes to the interface > to support finer granularity? Milliseconds should be fine, though higher > resolution would be fine, too. > > If so, there are a number of ways you can implement this. You could > make the interface modal, meaning that you "throw a switch" and the > standard interfaces become millisecond-level. Or you could create new I would consider that a no-go. We have to be and remain backwards compatible. > ioctls with millisecond level granularity. You would probably want some > way to fetch the granularity of the timer, too. Maybe there's another > better way. > We would have to add a new set of ioctls. Drivers could probably use the existing API but indicate resolution in struct watchdog_info (something like WDIOF_RESOLUTION_MS in watchdog_info.options, maybe). I am open to suggestions. Guenter
