1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifdef CONFIG_SCHED_AUTOGROUP 3 4 struct 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 17 extern void autogroup_init(struct task_struct *init_task); 18 extern void autogroup_free(struct task_group *tg); 19 20 static inline bool task_group_is_autogroup(struct task_group *tg) 21 { 22 return !!tg->autogroup; 23 } 24 25 extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg); 26 27 static inline struct task_group * 28 autogroup_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 38 extern int autogroup_path(struct task_group *tg, char *buf, int buflen); 39 40 #else /* !CONFIG_SCHED_AUTOGROUP */ 41 42 static inline void autogroup_init(struct task_struct *init_task) { } 43 static inline void autogroup_free(struct task_group *tg) { } 44 static inline bool task_group_is_autogroup(struct task_group *tg) 45 { 46 return 0; 47 } 48 49 static inline struct task_group * 50 autogroup_task_group(struct task_struct *p, struct task_group *tg) 51 { 52 return tg; 53 } 54 55 static inline int autogroup_path(struct task_group *tg, char *buf, int buflen) 56 { 57 return 0; 58 } 59 60 #endif /* CONFIG_SCHED_AUTOGROUP */ 61