LXR linux/kernel/sched/auto

   1#ifdef CONFIG_SCHED_AUTOGROUP
   2
   3#include <linux/kref.h>
   4#include <linux/rwsem.h>
   5
   6struct autogroup {
   7        struct kref             kref;
   8        struct task_group       *tg;
   9        struct rw_semaphore     lock;
  10        unsigned long           id;
  11        int                     nice;
  12};
  13
  14extern void autogroup_init(struct task_struct *init_task);
  15extern void autogroup_free(struct task_group *tg);
  16
  17static inline bool task_group_is_autogroup(struct task_group *tg)
  18{
  19        return !!tg->autogroup;
  20}
  21
  22extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
  23
  24static inline struct task_group *
  25autogroup_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
  35extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
  36
  37#else /* !CONFIG_SCHED_AUTOGROUP */
  38
  39static inline void autogroup_init(struct task_struct *init_task) {  }
  40static inline void autogroup_free(struct task_group *tg) { }
  41static inline bool task_group_is_autogroup(struct task_group *tg)
  42{
  43        return 0;
  44}
  45
  46static inline struct task_group *
  47autogroup_task_group(struct task_struct *p, struct task_group *tg)
  48{
  49        return tg;
  50}
  51
  52#ifdef CONFIG_SCHED_DEBUG
  53static 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 */
  60