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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>
This commit is contained in:
Peter Zijlstra 2008-02-13 15:45:40 +01:00 committed by Ingo Molnar
parent bccbe08a60
commit b68aa2300c
1 changed files with 15 additions and 0 deletions
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15
kernel/sched.c
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@ -4584,6 +4584,15 @@ recheck:
return -EPERM; return -EPERM;
} }
#ifdef CONFIG_RT_GROUP_SCHED
/*
* Do not allow realtime tasks into groups that have no runtime
* assigned.
*/
if (rt_policy(policy) && task_group(p)->rt_runtime == 0)
return -EPERM;
#endif
retval = security_task_setscheduler(p, policy, param); retval = security_task_setscheduler(p, policy, param);
if (retval) if (retval)
return retval; return retval;
@ -8028,9 +8037,15 @@ static int
cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp, cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
struct task_struct *tsk) struct task_struct *tsk)
{ {
#ifdef CONFIG_RT_GROUP_SCHED
/* 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;
#else
/* We don't support RT-tasks being in separate groups */ /* We don't support RT-tasks being in separate groups */
if (tsk->sched_class != &fair_sched_class) if (tsk->sched_class != &fair_sched_class)
return -EINVAL; return -EINVAL;
#endif
return 0; return 0;
} }