[$] Improved response times with latency nice

CPU scheduling can be a challenging task; the scheduler must ensure thatevery process gets a fair share of the available CPU time while, at thesame time, respecting CPU affinities, avoiding the migration of processesaway from their cached memory contents, and keeping all CPUs in the systembusy. Even then, users can become grumpy if specific processes do not gettheir CPU share quickly; from that comes years of debates over desktopresponsiveness, for example. The latency-nicepriority proposal recently resurrected by Vincent Guittot aims toprovide a new tool to help latency-sensitive applications get their CPUtime more quickly.