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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-02-13 09:45:40 -0500
committerIngo Molnar <mingo@elte.hu>2008-02-13 09:45:40 -0500
commitb68aa2300cabeb96801369a4bb37a4f19f59ed84 (patch)
treef596af1a8d6da83982a1203b1021f4af7ed1f3f5 /kernel
parentbccbe08a60973c873e6af6fdb9ec11ffb1a6e4de (diff)
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')
-rw-r--r--kernel/sched.c15
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:
4584 return -EPERM; 4584 return -EPERM;
4585 } 4585 }
4586 4586
4587#ifdef CONFIG_RT_GROUP_SCHED
4588 /*
4589 * Do not allow realtime tasks into groups that have no runtime
4590 * assigned.
4591 */
4592 if (rt_policy(policy) && task_group(p)->rt_runtime == 0)
4593 return -EPERM;
4594#endif
4595
4587 retval = security_task_setscheduler(p, policy, param); 4596 retval = security_task_setscheduler(p, policy, param);
4588 if (retval) 4597 if (retval)
4589 return retval; 4598 return retval;
@@ -8028,9 +8037,15 @@ static int
8028cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp, 8037cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
8029 struct task_struct *tsk) 8038 struct task_struct *tsk)
8030{ 8039{
8040#ifdef CONFIG_RT_GROUP_SCHED
8041 /* Don't accept realtime tasks when there is no way for them to run */
8042 if (rt_task(tsk) && cgroup_tg(cgrp)->rt_runtime == 0)
8043 return -EINVAL;
8044#else
8031 /* We don't support RT-tasks being in separate groups */ 8045 /* We don't support RT-tasks being in separate groups */
8032 if (tsk->sched_class != &fair_sched_class) 8046 if (tsk->sched_class != &fair_sched_class)
8033 return -EINVAL; 8047 return -EINVAL;
8048#endif
8034 8049
8035 return 0; 8050 return 0;
8036} 8051}