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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-02-13 15:45:40 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-02-13 15:45:40 +0100 |
| commit | b68aa2300cabeb96801369a4bb37a4f19f59ed84 (patch) | |
| tree | f596af1a8d6da83982a1203b1021f4af7ed1f3f5 /kernel/sched.c | |
| parent | bccbe08a60973c873e6af6fdb9ec11ffb1a6e4de (diff) | |
| download | lwn-b68aa2300cabeb96801369a4bb37a4f19f59ed84.tar.gz lwn-b68aa2300cabeb96801369a4bb37a4f19f59ed84.zip | |
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>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index d2f4398c5e6f..f28f19e65b59 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -4584,6 +4584,15 @@ recheck: 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); 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) { +#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 */ if (tsk->sched_class != &fair_sched_class) return -EINVAL; +#endif return 0; } |