forked from luck/tmp_suning_uos_patched
1c09ab0d25
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>
43 lines
1014 B
C
43 lines
1014 B
C
#ifdef CONFIG_SCHED_AUTOGROUP
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struct autogroup {
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/*
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* reference doesn't mean how many thread attach to this
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* autogroup now. It just stands for the number of task
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* could use this autogroup.
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*/
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struct kref kref;
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struct task_group *tg;
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struct rw_semaphore lock;
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unsigned long id;
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int nice;
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};
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static inline bool task_group_is_autogroup(struct task_group *tg);
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static inline struct task_group *
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autogroup_task_group(struct task_struct *p, struct task_group *tg);
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#else /* !CONFIG_SCHED_AUTOGROUP */
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static inline void autogroup_init(struct task_struct *init_task) { }
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static inline void autogroup_free(struct task_group *tg) { }
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static inline bool task_group_is_autogroup(struct task_group *tg)
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{
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return 0;
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}
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static inline struct task_group *
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autogroup_task_group(struct task_struct *p, struct task_group *tg)
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{
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return tg;
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}
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#ifdef CONFIG_SCHED_DEBUG
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static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
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{
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return 0;
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}
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#endif
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#endif /* CONFIG_SCHED_AUTOGROUP */
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