1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _KERNEL_SCHED_AUTOGROUP_H 3 #define _KERNEL_SCHED_AUTOGROUP_H 4 5 #ifdef CONFIG_SCHED_AUTOGROUP 6 7 struct autogroup { 8 /* 9 * Reference doesn't mean how many threads attach to this 10 * autogroup now. It just stands for the number of tasks 11 * which 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 extern unsigned int sysctl_sched_autogroup_enabled; 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 static inline int autogroup_path(struct task_group *tg, char *buf, int buflen) 60 { 61 return 0; 62 } 63 64 #endif /* CONFIG_SCHED_AUTOGROUP */ 65 66 #endif /* _KERNEL_SCHED_AUTOGROUP_H */ 67