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1 | #ifdef CONFIG_SCHED_AUTOGROUP | |
2 | ||
3 | #include <linux/kref.h> | |
4 | #include <linux/rwsem.h> | |
5 | ||
6 | struct autogroup { | |
7 | /* | |
8 | * reference doesn't mean how many thread attach to this | |
9 | * autogroup now. It just stands for the number of task | |
10 | * could use this autogroup. | |
11 | */ | |
12 | struct kref kref; | |
13 | struct task_group *tg; | |
14 | struct rw_semaphore lock; | |
15 | unsigned long id; | |
16 | int nice; | |
17 | }; | |
18 | ||
19 | extern void autogroup_init(struct task_struct *init_task); | |
20 | extern void autogroup_free(struct task_group *tg); | |
21 | ||
22 | static inline bool task_group_is_autogroup(struct task_group *tg) | |
23 | { | |
24 | return !!tg->autogroup; | |
25 | } | |
26 | ||
27 | extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg); | |
28 | ||
29 | static inline struct task_group * | |
30 | autogroup_task_group(struct task_struct *p, struct task_group *tg) | |
31 | { | |
32 | int enabled = READ_ONCE(sysctl_sched_autogroup_enabled); | |
33 | ||
34 | if (enabled && task_wants_autogroup(p, tg)) | |
35 | return p->signal->autogroup->tg; | |
36 | ||
37 | return tg; | |
38 | } | |
39 | ||
40 | extern int autogroup_path(struct task_group *tg, char *buf, int buflen); | |
41 | ||
42 | #else /* !CONFIG_SCHED_AUTOGROUP */ | |
43 | ||
44 | static inline void autogroup_init(struct task_struct *init_task) { } | |
45 | static inline void autogroup_free(struct task_group *tg) { } | |
46 | static inline bool task_group_is_autogroup(struct task_group *tg) | |
47 | { | |
48 | return 0; | |
49 | } | |
50 | ||
51 | static inline struct task_group * | |
52 | autogroup_task_group(struct task_struct *p, struct task_group *tg) | |
53 | { | |
54 | return tg; | |
55 | } | |
56 | ||
57 | #ifdef CONFIG_SCHED_DEBUG | |
58 | static inline int autogroup_path(struct task_group *tg, char *buf, int buflen) | |
59 | { | |
60 | return 0; | |
61 | } | |
62 | #endif | |
63 | ||
64 | #endif /* CONFIG_SCHED_AUTOGROUP */ |