Commit b68aa230 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched: rt-group: refure unrunnable tasks

Refuse to accept or create RT tasks in groups that can't run them.
Signed-off-by: default avatarPeter Zijlstra <>
Signed-off-by: default avatarIngo Molnar <>
parent bccbe08a
......@@ -4584,6 +4584,15 @@ int sched_setscheduler(struct task_struct *p, int policy,
return -EPERM;
* Do not allow realtime tasks into groups that have no runtime
* assigned.
if (rt_policy(policy) && task_group(p)->rt_runtime == 0)
return -EPERM;
retval = security_task_setscheduler(p, policy, param);
if (retval)
return retval;
......@@ -8028,9 +8037,15 @@ static int
cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
struct task_struct *tsk)
/* Don't accept realtime tasks when there is no way for them to run */
if (rt_task(tsk) && cgroup_tg(cgrp)->rt_runtime == 0)
return -EINVAL;
/* We don't support RT-tasks being in separate groups */
if (tsk->sched_class != &fair_sched_class)
return -EINVAL;
return 0;
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