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Commit 3c7d5184 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
Browse files

sched/rt: Do not submit new work when PI-blocked 



When we are PI-blocked then we want to get things done ASAP.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-vw8et3445km5b8mpihf4trae@git.kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 1c4dd99b

include/linux/sched.h

+8 −0
Original line number Diff line number Diff line
@@ -2082,12 +2082,20 @@ extern unsigned int sysctl_sched_cfs_bandwidth_slice; 
extern int rt_mutex_getprio(struct task_struct *p);

extern void rt_mutex_setprio(struct task_struct *p, int prio);

extern void rt_mutex_adjust_pi(struct task_struct *p);

static inline bool tsk_is_pi_blocked(struct task_struct *tsk)

{

	return tsk->pi_blocked_on != NULL;

}

#else

static inline int rt_mutex_getprio(struct task_struct *p)

{

	return p->normal_prio;

}

# define rt_mutex_adjust_pi(p)		do { } while (0)

static inline bool tsk_is_pi_blocked(struct task_struct *tsk)

{

	return false;

}

#endif



extern bool yield_to(struct task_struct *p, bool preempt);

kernel/sched/core.c

+1 −1
Original line number Diff line number Diff line
@@ -3227,7 +3227,7 @@ need_resched: 


static inline void sched_submit_work(struct task_struct *tsk)

{

	if (!tsk->state)

	if (!tsk->state || tsk_is_pi_blocked(tsk))

		return;

	/*

	 * If we are going to sleep and we have plugged IO queued,