Actually, his main point is "here is a workload that is kernel-bound that ordinary users deal with, and here is where the time goes." He has explained in the pa

Actually, his main point is "here is a workload that is kernel-bound that ordinary users deal with, and here is where the time goes." He has explained in the past that he works on whatever interests him, period. So profiling page faults must be more interesting to him than speeding up the build per se. That's all.