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         /*
   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
  19 extern void autogroup_init(struct task_struct *init_task);
  20 extern void autogroup_free(struct task_group *tg);
  21
  22 static inline bool task_group_is_autogroup(struct task_group *tg)
  23 {
  24         return !!tg->autogroup;
  25 }
  26
  27 extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
  28
  29 static inline struct task_group *
  30 autogroup_task_group(struct task_struct *p, struct task_group *tg)
  31 {
  32         int enabled = READ_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
  40 extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
  41
  42 #else /* !CONFIG_SCHED_AUTOGROUP */
  43
  44 static inline void autogroup_init(struct task_struct *init_task) {  }
  45 static inline void autogroup_free(struct task_group *tg) { }
  46 static inline bool task_group_is_autogroup(struct task_group *tg)
  47 {
  48         return 0;
  49 }
  50
  51 static inline struct task_group *
  52 autogroup_task_group(struct task_struct *p, struct task_group *tg)
  53 {
  54         return tg;
  55 }
  56
  57 #ifdef CONFIG_SCHED_DEBUG
  58 static 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 */