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-rw-r--r--kernel/sched/autogroup.h66
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 */