LXR linux/kernel/sched/autogroup.h

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