On Mon, May 15, 2017 at 02:14:13PM -0500, Dave Kleikamp wrote: > With CONFIG_RT_GROUP_SCHED defined, do_sched_rt_period_timer() sequentially > takes each cpu's rq->lock. On a large, busy system, the cumulative time it > takes to acquire each lock can be excessive, even triggering a watchdog > timeout. > > If rt_rq_rt_time and rt_rq->rt_nr_running are both zero, this function does > nothing while holding the lock, so don't bother taking it at all.
Indeed, thanks Dave!
