[$] A proxy-execution baby step

Priority inversion comes about when a low-priority task holds a resourcethat is also needed by a high-priority task, preventing the latter fromrunning. This problem is made much worse if the low-priority task isunable to gain access to the CPU and, as a result, cannot complete its workand free the resources it holds. Proxy execution is a potential solutionto this problem, but it is a complex solution that has been underdevelopment for several years; LWN first lookedat it in 2020. The 6.17 kernel is likely to contain an important stepforward for this long-running project.