1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifdef CONFIG_SCHED_AUTOGROUP 3 4 #include <linux/kref.h> 5 #include <linux/rwsem.h> 6 #include <linux/sched/autogroup.h> 7 8 struct autogroup { 9 /* 10 * reference doesn't mean how many thread attach to this 11 * autogroup now. It just stands for the number of task 12 * could use this autogroup. 13 */ 14 struct kref kref; 15 struct task_group *tg; 16 struct rw_semaphore lock; 17 unsigned long id; 18 int nice; 19 }; 20 21 extern void autogroup_init(struct task_struct *init_task); 22 extern void autogroup_free(struct task_group *tg); 23 24 static inline bool task_group_is_autogroup(struct task_group *tg) 25 { 26 return !!tg->autogroup; 27 } 28 29 extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg); 30 31 static inline struct task_group * 32 autogroup_task_group(struct task_struct *p, struct task_group *tg) 33 { 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 #ifdef CONFIG_SCHED_DEBUG 60 static inline int autogroup_path(struct task_group *tg, char *buf, int buflen) 61 { 62 return 0; 63 } 64 #endif 65 66 #endif /* CONFIG_SCHED_AUTOGROUP */ 67