Commit ff0d4a9d authored Oct 04, 2017 by Sebastian Andrzej Siewior Committed by Ingo Molnar Oct 10, 2017

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



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>

parent 93f50f90

include/linux/sched/rt.h

+11 −0

Original line number	Diff line number	Diff line
		@@ -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.