linux/kernel/sched/auto_group.h
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   1#ifdef CONFIG_SCHED_AUTOGROUP
   2
   3#include <linux/kref.h>
   4#include <linux/rwsem.h>
   5
   6struct autogroup {
   7        /*
   8         * reference doesn't mean how many thread attach to this
   9         * autogroup now. It just stands for the number of task
  10         * could use this autogroup.
  11         */
  12        struct kref             kref;
  13        struct task_group       *tg;
  14        struct rw_semaphore     lock;
  15        unsigned long           id;
  16        int                     nice;
  17};
  18
  19extern void autogroup_init(struct task_struct *init_task);
  20extern void autogroup_free(struct task_group *tg);
  21
  22static inline bool task_group_is_autogroup(struct task_group *tg)
  23{
  24        return !!tg->autogroup;
  25}
  26
  27extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
  28
  29static inline struct task_group *
  30autogroup_task_group(struct task_struct *p, struct task_group *tg)
  31{
  32        int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
  33
  34        if (enabled && task_wants_autogroup(p, tg))
  35                return p->signal->autogroup->tg;
  36
  37        return tg;
  38}
  39
  40extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
  41
  42#else /* !CONFIG_SCHED_AUTOGROUP */
  43
  44static inline void autogroup_init(struct task_struct *init_task) {  }
  45static inline void autogroup_free(struct task_group *tg) { }
  46static inline bool task_group_is_autogroup(struct task_group *tg)
  47{
  48        return 0;
  49}
  50
  51static inline struct task_group *
  52autogroup_task_group(struct task_struct *p, struct task_group *tg)
  53{
  54        return tg;
  55}
  56
  57#ifdef CONFIG_SCHED_DEBUG
  58static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
  59{
  60        return 0;
  61}
  62#endif
  63
  64#endif /* CONFIG_SCHED_AUTOGROUP */
  65
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