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sched/rt: Add a helper to test for a RT task

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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 <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Jens Axboe <axboe@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20171004154901.26904-1-bigeasy@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior 2017-10-04 17:49:00 +02:00 committed by Ingo Molnar
parent 93f50f9024
commit ff0d4a9dc1
1 changed files with 11 additions and 0 deletions
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11
include/linux/sched/rt.h
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@ -17,6 +17,17 @@ static inline int rt_task(struct task_struct *p)
return rt_prio(p->prio);
}
static inline bool task_is_realtime(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.