kernel/sched/auto_group.h

   1 #ifdef CONFIG_SCHED_AUTOGROUP
   2
   3 #include <linux/kref.h>
   4 #include <linux/rwsem.h>
   5
   6 struct autogroup {
   7         struct kref             kref;
   8         struct task_group       *tg;
   9         struct rw_semaphore     lock;
  10         unsigned long           id;
  11         int                     nice;
  12 };
  13
  14 extern void autogroup_init(struct task_struct *init_task);
  15 extern void autogroup_free(struct task_group *tg);
  16
  17 static inline bool task_group_is_autogroup(struct task_group *tg)
  18 {
  19         return !!tg->autogroup;
  20 }
  21
  22 extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
  23
  24 static inline struct task_group *
  25 autogroup_task_group(struct task_struct *p, struct task_group *tg)
  26 {
  27         int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
  28
  29         if (enabled && task_wants_autogroup(p, tg))
  30                 return p->signal->autogroup->tg;
  31
  32         return tg;
  33 }
  34
  35 extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
  36
  37 #else /* !CONFIG_SCHED_AUTOGROUP */
  38
  39 static inline void autogroup_init(struct task_struct *init_task) {  }
  40 static inline void autogroup_free(struct task_group *tg) { }
  41 static inline bool task_group_is_autogroup(struct task_group *tg)
  42 {
  43         return 0;
  44 }
  45
  46 static inline struct task_group *
  47 autogroup_task_group(struct task_struct *p, struct task_group *tg)
  48 {
  49         return tg;
  50 }
  51
  52 #ifdef CONFIG_SCHED_DEBUG
  53 static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
  54 {
  55         return 0;
  56 }
  57 #endif
  58
  59 #endif /* CONFIG_SCHED_AUTOGROUP */