1 // SPDX-License-Identifier: GPL-2.0
4  * Auto-group scheduling implementation:
38 	init_task->signal->autogroup = &autogroup_default;  in autogroup_init()
44 	kfree(tg->autogroup);  in autogroup_free()
52 	/* We've redirected RT tasks to the root task group... */  in autogroup_destroy()
53 	ag->tg->rt_se = NULL;  in autogroup_destroy()
54 	ag->tg->rt_rq = NULL;  in autogroup_destroy()
56 	sched_release_group(ag->tg);  in autogroup_destroy()
57 	sched_destroy_group(ag->tg);  in autogroup_destroy()
62 	kref_put(&ag->kref, autogroup_destroy);  in autogroup_kref_put()
67 	kref_get(&ag->kref);  in autogroup_kref_get()
79 	ag = autogroup_kref_get(p->signal->autogroup);  in autogroup_task_get()
97 	kref_init(&ag->kref);  in autogroup_create()
98 	init_rwsem(&ag->lock);  in autogroup_create()
99 	ag->id = atomic_inc_return(&autogroup_seq_nr);  in autogroup_create()
100 	ag->tg = tg;  in autogroup_create()
103 	 * Autogroup RT tasks are redirected to the root task group  in autogroup_create()
110 	tg->rt_se = root_task_group.rt_se;  in autogroup_create()
111 	tg->rt_rq = root_task_group.rt_rq;  in autogroup_create()
113 	tg->autogroup = ag;  in autogroup_create()
135 	 * value of signal->autogroup but in this case sched_move_task() will  in task_wants_autogroup()
139 	 * to avoid autogroup->tg, so we abuse PF_EXITING flag for this case.  in task_wants_autogroup()
141 	if (p->flags & PF_EXITING)  in task_wants_autogroup()
151 	 * see this thread after that: we can no longer use signal->autogroup.  in sched_autogroup_exit_task()
167 	prev = p->signal->autogroup;  in autogroup_move_group()
173 	p->signal->autogroup = autogroup_kref_get(ag);  in autogroup_move_group()
175 	 * We can't avoid sched_move_task() after we changed signal->autogroup,  in autogroup_move_group()
176 	 * this process can already run with task_group() == prev->tg or we can  in autogroup_move_group()
177 	 * race with cgroup code which can read autogroup = prev under rq->lock.  in autogroup_move_group()
180 	 * can't be removed from thread list, we hold ->siglock.  in autogroup_move_group()
213 	sig->autogroup = autogroup_task_get(current);  in sched_autogroup_fork()
218 	autogroup_kref_put(sig->autogroup);  in sched_autogroup_exit()
239 		return -EINVAL;  in proc_sched_autogroup_set_nice()
246 		return -EPERM;  in proc_sched_autogroup_set_nice()
250 		return -EAGAIN;  in proc_sched_autogroup_set_nice()
258 	down_write(&ag->lock);  in proc_sched_autogroup_set_nice()
259 	err = sched_group_set_shares(ag->tg, shares);  in proc_sched_autogroup_set_nice()
261 		ag->nice = nice;  in proc_sched_autogroup_set_nice()
262 	up_write(&ag->lock);  in proc_sched_autogroup_set_nice()
273 	if (!task_group_is_autogroup(ag->tg))  in proc_sched_autogroup_show_task()
276 	down_read(&ag->lock);  in proc_sched_autogroup_show_task()
277 	seq_printf(m, "/autogroup-%ld nice %d\n", ag->id, ag->nice);  in proc_sched_autogroup_show_task()
278 	up_read(&ag->lock);  in proc_sched_autogroup_show_task()
290 	return snprintf(buf, buflen, "%s-%ld", "/autogroup", tg->autogroup->id);  in autogroup_path()