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 */ 66