diff options
| -rw-r--r-- | kernel/sched/core.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index a4869bd..97fe79c 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -690,6 +690,23 @@ static inline bool got_nohz_idle_kick(void) bool sched_can_stop_tick(void) { /* + * FIFO realtime policy runs the highest priority task. Other runnable + * tasks are of a lower priority. The scheduler tick does nothing. + */ + if (current->policy == SCHED_FIFO) + return true; + + /* + * Round-robin realtime tasks time slice with other tasks at the same + * realtime priority. Is this task the only one at this priority? + */ + if (current->policy == SCHED_RR) { + struct sched_rt_entity *rt_se = ¤t->rt; + + return rt_se->run_list.prev == rt_se->run_list.next; + } + + /* * More than one running task need preemption. * nr_running update is assumed to be visible * after IPI is sent from wakers. |