| Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 2 | |
| Peter Zijlstra | 029632f | 2011-10-25 10:00:11 +0200 | [diff] [blame] | 3 | #include <linux/kref.h> |
| 4 | #include <linux/rwsem.h> |
| Ingo Molnar | 4eb5aaa | 2017-02-08 18:51:29 +0100 | [diff] [blame] | 5 | #include <linux/sched/autogroup.h> |
| Peter Zijlstra | 029632f | 2011-10-25 10:00:11 +0200 | [diff] [blame] | 6 | |
| Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 7 | struct autogroup { |
| Ingo Molnar | c1ad41f | 2012-12-11 10:23:45 +0100 | [diff] [blame] | 8 | /* |
| 9 | * reference doesn't mean how many thread attach to this |
| 10 | * autogroup now. It just stands for the number of task |
| 11 | * could use this autogroup. |
| 12 | */ |
| Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 13 | struct kref kref; |
| 14 | struct task_group *tg; |
| 15 | struct rw_semaphore lock; |
| 16 | unsigned long id; |
| 17 | int nice; |
| 18 | }; |
| 19 | |
| Peter Zijlstra | 029632f | 2011-10-25 10:00:11 +0200 | [diff] [blame] | 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 | |
| Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 30 | static inline struct task_group * |
| Peter Zijlstra | 029632f | 2011-10-25 10:00:11 +0200 | [diff] [blame] | 31 | autogroup_task_group(struct task_struct *p, struct task_group *tg) |
| 32 | { |
| Jason Low | 316c1608d | 2015-04-28 13:00:20 -0700 | [diff] [blame] | 33 | int enabled = READ_ONCE(sysctl_sched_autogroup_enabled); |
| Ingo Molnar | c1ad41f | 2012-12-11 10:23:45 +0100 | [diff] [blame] | 34 | |
| 35 | if (enabled && task_wants_autogroup(p, tg)) |
| Peter Zijlstra | 029632f | 2011-10-25 10:00:11 +0200 | [diff] [blame] | 36 | return p->signal->autogroup->tg; |
| 37 | |
| 38 | return tg; |
| 39 | } |
| 40 | |
| 41 | extern int autogroup_path(struct task_group *tg, char *buf, int buflen); |
| Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 42 | |
| 43 | #else /* !CONFIG_SCHED_AUTOGROUP */ |
| 44 | |
| 45 | static inline void autogroup_init(struct task_struct *init_task) { } |
| 46 | static inline void autogroup_free(struct task_group *tg) { } |
| Mike Galbraith | f449377 | 2011-01-13 04:54:50 +0100 | [diff] [blame] | 47 | static inline bool task_group_is_autogroup(struct task_group *tg) |
| 48 | { |
| 49 | return 0; |
| 50 | } |
| Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 51 | |
| 52 | static inline struct task_group * |
| 53 | autogroup_task_group(struct task_struct *p, struct task_group *tg) |
| 54 | { |
| 55 | return tg; |
| 56 | } |
| 57 | |
| 58 | #ifdef CONFIG_SCHED_DEBUG |
| 59 | static inline int autogroup_path(struct task_group *tg, char *buf, int buflen) |
| 60 | { |
| 61 | return 0; |
| 62 | } |
| 63 | #endif |
| 64 | |
| 65 | #endif /* CONFIG_SCHED_AUTOGROUP */ |