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

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

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-vw8et3445km5b8mpihf4trae@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2011-07-17 20:46:52 +02:00 committed by Ingo Molnar
parent 1c4dd99bed
commit 3c7d51843b
2 changed files with 9 additions and 1 deletions
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8
include/linux/sched.h
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@ -2082,12 +2082,20 @@ extern unsigned int sysctl_sched_cfs_bandwidth_slice;
extern int rt_mutex_getprio(struct task_struct *p); extern int rt_mutex_getprio(struct task_struct *p);
extern void rt_mutex_setprio(struct task_struct *p, int prio); extern void rt_mutex_setprio(struct task_struct *p, int prio);
extern void rt_mutex_adjust_pi(struct task_struct *p); 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 #else
static inline int rt_mutex_getprio(struct task_struct *p) static inline int rt_mutex_getprio(struct task_struct *p)
{ {
return p->normal_prio; return p->normal_prio;
} }
# define rt_mutex_adjust_pi(p) do { } while (0) # define rt_mutex_adjust_pi(p) do { } while (0)
static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
{
return false;
}
#endif #endif
extern bool yield_to(struct task_struct *p, bool preempt); extern bool yield_to(struct task_struct *p, bool preempt);

2
kernel/sched/core.c
View File

@ -3227,7 +3227,7 @@ need_resched:
static inline void sched_submit_work(struct task_struct *tsk) static inline void sched_submit_work(struct task_struct *tsk)
{ {
if (!tsk->state) if (!tsk->state || tsk_is_pi_blocked(tsk))
return; return;
/* /*
* If we are going to sleep and we have plugged IO queued, * If we are going to sleep and we have plugged IO queued,