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
task_group_is_autogroup(struct task_group * tg)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 *
autogroup_task_group(struct task_struct * p,struct task_group * tg)30 autogroup_task_group(struct task_struct *p, struct task_group *tg)
31 {
32 int enabled = ACCESS_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
autogroup_init(struct task_struct * init_task)44 static inline void autogroup_init(struct task_struct *init_task) { }
autogroup_free(struct task_group * tg)45 static inline void autogroup_free(struct task_group *tg) { }
task_group_is_autogroup(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 *
autogroup_task_group(struct task_struct * p,struct task_group * tg)52 autogroup_task_group(struct task_struct *p, struct task_group *tg)
53 {
54 return tg;
55 }
56
57 #ifdef CONFIG_SCHED_DEBUG
autogroup_path(struct task_group * tg,char * buf,int buflen)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 */
65