This helper returns true if a task has elevated priority which is true for RT tasks (SCHED_RR and SCHED_FIFO) and also for SCHED_DEADLINE. A task which runs at RT priority due to PI-boosting is not considered as one with elevated priority.
Signed-off-by: Sebastian Andrzej Siewior <[email protected]> --- include/linux/sched/rt.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/sched/rt.h b/include/linux/sched/rt.h index f93329aba31a..30a86b8178f8 100644 --- a/include/linux/sched/rt.h +++ b/include/linux/sched/rt.h @@ -17,6 +17,17 @@ static inline int rt_task(struct task_struct *p) return rt_prio(p->prio); } +static inline bool task_is_elevated(struct task_struct *tsk) +{ + int policy = tsk->policy; + + if (policy == SCHED_FIFO || policy == SCHED_RR) + return true; + if (policy == SCHED_DEADLINE) + return true; + return false; +} + #ifdef CONFIG_RT_MUTEXES /* * Must hold either p->pi_lock or task_rq(p)->lock. -- 2.14.2
