linux-stable/kernel/sched_autogroup.h
Yong Zhang 1c09ab0d25 sched: Skip autogroup when looking for all rt sched groups
Since commit ec514c48 ("sched: Fix rt_rq runtime leakage bug")
'cat /proc/sched_debug' will print data of root_task_group.rt_rq
multiple times.

This is because autogroup does not have its own rt group, instead
rt group of autogroup is linked to root_task_group.

So skip it when we are looking for all rt sched groups, and it
will also save some noop operation against root_task_group when
__disable_runtime()/__enable_runtime().

-v2: Based on Cheng Xu's idea which uses less code.

Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Cheng Xu <chengxu@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/BANLkTi=87P3RoTF_UEtamNfc_XGxQXE__Q@mail.gmail.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-07-01 10:39:08 +02:00

42 lines
1,014 B
C

#ifdef CONFIG_SCHED_AUTOGROUP
struct autogroup {
/*
* reference doesn't mean how many thread attach to this
* autogroup now. It just stands for the number of task
* could use this autogroup.
*/
struct kref kref;
struct task_group *tg;
struct rw_semaphore lock;
unsigned long id;
int nice;
};
static inline bool task_group_is_autogroup(struct task_group *tg);
static inline struct task_group *
autogroup_task_group(struct task_struct *p, struct task_group *tg);
#else /* !CONFIG_SCHED_AUTOGROUP */
static inline void autogroup_init(struct task_struct *init_task) { }
static inline void autogroup_free(struct task_group *tg) { }
static inline bool task_group_is_autogroup(struct task_group *tg)
{
return 0;
}
static inline struct task_group *
autogroup_task_group(struct task_struct *p, struct task_group *tg)
{
return tg;
}
#ifdef CONFIG_SCHED_DEBUG
static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
{
return 0;
}
#endif
#endif /* CONFIG_SCHED_AUTOGROUP */