On Thu, Aug 01, 2019 at 02:17:18PM +0200, Peter Zijlstra wrote: > I'm thinking that isn't true 99% of the time, except of course when that > bandsaw emergency break is attached through SPI, but in that case the > admin can very well chrt the prio of this thread. The SPI thread isn't usually RT, it's only made RT if something in the system asks for it - the reason the ChromeOS people got CCed in is that some of their embedded controllers are very fragile and need super tight timing on some of the interactions over their control interface so they're one of the users here. Of course everyone is then going to claim that their usage is the most critical usage in the system, and they may well even be right, but I do tend to agree that just any old RT priority is probably a sensible default since for most cases there will be few if any other RT tasks anyway.
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