kernel/sched/autogroup.h

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