Realtime tasks would not account their runtime during ticks. Which would lead to: struct sched_param param = { .sched_priority = 10 }; pthread_setschedparam(pthread_self(), SCHED_FIFO, ¶m); while (1) ; Not showing up in top. Signed-off-by: Peter Zijlstra --- kernel/sched_rt.c | 2 ++ 1 file changed, 2 insertions(+) Index: linux-2.6/kernel/sched_rt.c =================================================================== --- linux-2.6.orig/kernel/sched_rt.c +++ linux-2.6/kernel/sched_rt.c @@ -837,6 +837,8 @@ static void prio_changed_rt(struct rq *r static void task_tick_rt(struct rq *rq, struct task_struct *p) { + update_curr_rt(rq); + /* * RR tasks need a special form of timeslice management. * FIFO tasks have no timeslices. -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/