sched: rt-group: refure unrunnable tasks
Refuse to accept or create RT tasks in groups that can't run them. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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1 changed files with 15 additions and 0 deletions
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@ -4584,6 +4584,15 @@ int sched_setscheduler(struct task_struct *p, int policy,
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return -EPERM;
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}
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#ifdef CONFIG_RT_GROUP_SCHED
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/*
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* Do not allow realtime tasks into groups that have no runtime
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* assigned.
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*/
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if (rt_policy(policy) && task_group(p)->rt_runtime == 0)
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return -EPERM;
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#endif
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retval = security_task_setscheduler(p, policy, param);
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if (retval)
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return retval;
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@ -8028,9 +8037,15 @@ static int
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cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
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struct task_struct *tsk)
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{
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#ifdef CONFIG_RT_GROUP_SCHED
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/* Don't accept realtime tasks when there is no way for them to run */
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if (rt_task(tsk) && cgroup_tg(cgrp)->rt_runtime == 0)
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return -EINVAL;
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#else
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/* We don't support RT-tasks being in separate groups */
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if (tsk->sched_class != &fair_sched_class)
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return -EINVAL;
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#endif
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return 0;
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}
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