autogroup.h (1640B)
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 7struct 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 20extern void autogroup_init(struct task_struct *init_task); 21extern void autogroup_free(struct task_group *tg); 22 23static inline bool task_group_is_autogroup(struct task_group *tg) 24{ 25 return !!tg->autogroup; 26} 27 28extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg); 29 30static inline struct task_group * 31autogroup_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 42extern int autogroup_path(struct task_group *tg, char *buf, int buflen); 43 44#else /* !CONFIG_SCHED_AUTOGROUP */ 45 46static inline void autogroup_init(struct task_struct *init_task) { } 47static inline void autogroup_free(struct task_group *tg) { } 48static inline bool task_group_is_autogroup(struct task_group *tg) 49{ 50 return 0; 51} 52 53static inline struct task_group * 54autogroup_task_group(struct task_struct *p, struct task_group *tg) 55{ 56 return tg; 57} 58 59static 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 */