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 | |