From b29739f902ee76a05493fb7d2303490fc75364f4 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Tue, 27 Jun 2006 02:54:51 -0700 Subject: [PATCH] pi-futex: scheduler support for pi Add framework to boost/unboost the priority of RT tasks. This consists of: - caching the 'normal' priority in ->normal_prio - providing a functions to set/get the priority of the task - make sched_setscheduler() aware of boosting The effective_prio() cleanups also fix a priority-calculation bug pointed out by Andrey Gelman, in set_user_nice(). has_rt_policy() fix: Peter Williams Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner Signed-off-by: Arjan van de Ven Cc: Andrey Gelman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/sched.h | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) (limited to 'include/linux/sched.h') diff --git a/include/linux/sched.h b/include/linux/sched.h index 0bc81a1..6f16764 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -495,8 +495,11 @@ struct signal_struct { #define MAX_PRIO (MAX_RT_PRIO + 40) -#define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO)) +#define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO) +#define rt_task(p) rt_prio((p)->prio) #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH)) +#define has_rt_policy(p) \ + unlikely((p)->policy != SCHED_NORMAL && (p)->policy != SCHED_BATCH) /* * Some day this will be a full-fledged user tracking system.. @@ -725,7 +728,7 @@ struct task_struct { #endif #endif int load_weight; /* for niceness load balancing purposes */ - int prio, static_prio; + int prio, static_prio, normal_prio; struct list_head run_list; prio_array_t *array; @@ -852,6 +855,9 @@ struct task_struct { /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ spinlock_t alloc_lock; + /* Protection of the PI data structures: */ + spinlock_t pi_lock; + #ifdef CONFIG_DEBUG_MUTEXES /* mutex deadlock detection */ struct mutex_waiter *blocked_on; @@ -1018,6 +1024,17 @@ static inline void idle_task_exit(void) {} #endif extern void sched_idle_next(void); + +#ifdef CONFIG_RT_MUTEXES +extern int rt_mutex_getprio(task_t *p); +extern void rt_mutex_setprio(task_t *p, int prio); +#else +static inline int rt_mutex_getprio(task_t *p) +{ + return p->normal_prio; +} +#endif + extern void set_user_nice(task_t *p, long nice); extern int task_prio(const task_t *p); extern int task_nice(const task_t *p); -- cgit v1.1