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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.