Re: [RFC][PATCH 3/3] sched: User Mode Concurency Groups

[Peter Zijlstra]

On Tue, Jan 18, 2022 at 10:19:21AM -0800, Peter Oskolkov wrote:

> ================ worker timeouts
> 
> Timeouts now are easy to explain: mutex::lock() and condvar::wait() have
> timeouts, so workers waiting on these primitives naturally wait with timeouts;
> if sys_umcg_wait() supports worker timeouts, this is it, all is simple; if
> it does not, the userspace now has to implement the whole timeout machinery,
> in order to wake these sleeping workers when their timeouts expire.

I still have absolutely no idea what you're on about here. Please reply
to the email on that subject:

  https://lkml.kernel.org/r/Ya34S2JCQg+81h4t@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

What would you have the timeout actually do? Talk about the state
transitions.