kernel/sched/autogroup.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifdef CONFIG_SCHED_AUTOGROUP
   3
   4 #include <linux/kref.h>
   5 #include <linux/rwsem.h>
   6 #include <linux/sched/autogroup.h>
   7
   8 struct autogroup {
   9         /*
  10          * reference doesn't mean how many thread attach to this
  11          * autogroup now. It just stands for the number of task
  12          * could use this autogroup.
  13          */
  14         struct kref             kref;
  15         struct task_group       *tg;
  16         struct rw_semaphore     lock;
  17         unsigned long           id;
  18         int                     nice;
  19 };
  20
  21 extern void autogroup_init(struct task_struct *init_task);
  22 extern void autogroup_free(struct task_group *tg);
  23
  24 static inline bool task_group_is_autogroup(struct task_group *tg)
  25 {
  26         return !!tg->autogroup;
  27 }
  28
  29 extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
  30
  31 static inline struct task_group *
  32 autogroup_task_group(struct task_struct *p, struct task_group *tg)
  33 {
  34         int enabled = READ_ONCE(sysctl_sched_autogroup_enabled);
  35
  36         if (enabled && task_wants_autogroup(p, tg))
  37                 return p->signal->autogroup->tg;
  38
  39         return tg;
  40 }
  41
  42 extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
  43
  44 #else /* !CONFIG_SCHED_AUTOGROUP */
  45
  46 static inline void autogroup_init(struct task_struct *init_task) {  }
  47 static inline void autogroup_free(struct task_group *tg) { }
  48 static inline bool task_group_is_autogroup(struct task_group *tg)
  49 {
  50         return 0;
  51 }
  52
  53 static inline struct task_group *
  54 autogroup_task_group(struct task_struct *p, struct task_group *tg)
  55 {
  56         return tg;
  57 }
  58
  59 #ifdef CONFIG_SCHED_DEBUG
  60 static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
  61 {
  62         return 0;
  63 }
  64 #endif
  65
  66 #endif /* CONFIG_SCHED_AUTOGROUP */