[$] What remains to be done for proxy execution

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