1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _KERNEL_SCHED_AUTOGROUP_H 3 #define _KERNEL_SCHED_AUTOGROUP_H 4 5 #include "sched.h" 6 7 #ifdef CONFIG_SCHED_AUTOGROUP 8 9 struct autogroup { 10 /* 11 * Reference doesn't mean how many threads attach to this 12 * autogroup now. It just stands for the number of tasks 13 * which could use this autogroup. 14 */ 15 struct kref kref; 16 struct task_group *tg; 17 struct rw_semaphore lock; 18 unsigned long id; 19 int nice; 20 }; 21 22 extern void autogroup_init(struct task_struct *init_task); 23 extern void autogroup_free(struct task_group *tg); 24 25 static inline bool task_group_is_autogroup(struct task_group *tg) 26 { 27 return !!tg->autogroup; 28 } 29 30 extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg); 31 32 static inline struct task_group * 33 autogroup_task_group(struct task_struct *p, struct task_group *tg) 34 { 35 extern unsigned int sysctl_sched_autogroup_enabled; 36 int enabled = READ_ONCE(sysctl_sched_autogroup_enabled); 37 38 if (enabled && task_wants_autogroup(p, tg)) 39 return p->signal->autogroup->tg; 40 41 return tg; 42 } 43 44 extern int autogroup_path(struct task_group *tg, char *buf, int buflen); 45 46 #else /* !CONFIG_SCHED_AUTOGROUP: */ 47 48 static inline void autogroup_init(struct task_struct *init_task) { } 49 static inline void autogroup_free(struct task_group *tg) { } 50 static inline bool task_group_is_autogroup(struct task_group *tg) 51 { 52 return 0; 53 } 54 55 static inline struct task_group * 56 autogroup_task_group(struct task_struct *p, struct task_group *tg) 57 { 58 return tg; 59 } 60 61 static inline int autogroup_path(struct task_group *tg, char *buf, int buflen) 62 { 63 return 0; 64 } 65 66 #endif /* !CONFIG_SCHED_AUTOGROUP */ 67 68 #endif /* _KERNEL_SCHED_AUTOGROUP_H */ 69