[$] What remains to be done for proxy execution

The kernel's deadline scheduling class
offers a solution to a number of realtime (or generally latency-sensitive)
problems, but it is also resistant to the usual solutions for the priority-inversion
problem. The development community has been pursuing proxy execution as a
solution to a few scheduling challenges, including this one; the problem is
difficult and progress has been slow. LWN last looked at proxy execution in June; at the 2023 Linux
Plumbers Conference, John Stultz gave an overview of proxy execution,
the current status of the work, and the remaining problems to solve.