diff options
Diffstat (limited to 'kernel/sched/autogroup.h')
| -rw-r--r-- | kernel/sched/autogroup.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/kernel/sched/autogroup.h b/kernel/sched/autogroup.h new file mode 100644 index 000000000..90d69f2c5 --- /dev/null +++ b/kernel/sched/autogroup.h @@ -0,0 +1,66 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _KERNEL_SCHED_AUTOGROUP_H +#define _KERNEL_SCHED_AUTOGROUP_H + +#ifdef CONFIG_SCHED_AUTOGROUP + +struct autogroup { + /* + * Reference doesn't mean how many threads attach to this + * autogroup now. It just stands for the number of tasks + * which could use this autogroup. + */ + struct kref kref; + struct task_group *tg; + struct rw_semaphore lock; + unsigned long id; + int nice; +}; + +extern void autogroup_init(struct task_struct *init_task); +extern void autogroup_free(struct task_group *tg); + +static inline bool task_group_is_autogroup(struct task_group *tg) +{ + return !!tg->autogroup; +} + +extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg); + +static inline struct task_group * +autogroup_task_group(struct task_struct *p, struct task_group *tg) +{ + extern unsigned int sysctl_sched_autogroup_enabled; + int enabled = READ_ONCE(sysctl_sched_autogroup_enabled); + + if (enabled && task_wants_autogroup(p, tg)) + return p->signal->autogroup->tg; + + return tg; +} + +extern int autogroup_path(struct task_group *tg, char *buf, int buflen); + +#else /* !CONFIG_SCHED_AUTOGROUP */ + +static inline void autogroup_init(struct task_struct *init_task) { } +static inline void autogroup_free(struct task_group *tg) { } +static inline bool task_group_is_autogroup(struct task_group *tg) +{ + return 0; +} + +static inline struct task_group * +autogroup_task_group(struct task_struct *p, struct task_group *tg) +{ + return tg; +} + +static inline int autogroup_path(struct task_group *tg, char *buf, int buflen) +{ + return 0; +} + +#endif /* CONFIG_SCHED_AUTOGROUP */ + +#endif /* _KERNEL_SCHED_AUTOGROUP_H */ |