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
task_group_is_autogroup(struct task_group * tg)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 *
autogroup_task_group(struct task_struct * p,struct task_group * tg)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
autogroup_init(struct task_struct * init_task)42 static inline void autogroup_init(struct task_struct *init_task) { }
autogroup_free(struct task_group * tg)43 static inline void autogroup_free(struct task_group *tg) { }
task_group_is_autogroup(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 *
autogroup_task_group(struct task_struct * p,struct task_group * tg)50 autogroup_task_group(struct task_struct *p, struct task_group *tg)
51 {
52 return tg;
53 }
54
autogroup_path(struct task_group * tg,char * buf,int buflen)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