sched: rt: multi level group constraints

multi level rt constraints

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 33 insertions, 0 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index debb06a4a6..475e3fcab7 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -8228,6 +8228,38 @@ static unsigned long to_ratio(u64 period, u64 runtime)
         return div64_64(runtime << 16, period);
 }
 
+#ifdef CONFIG_CGROUP_SCHED
+static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
+{
+        struct task_group *tgi, *parent = tg->parent;
+        unsigned long total = 0;
+
+        if (!parent) {
+                if (global_rt_period() < period)
+                        return 0;
+
+                return to_ratio(period, runtime) <
+                        to_ratio(global_rt_period(), global_rt_runtime());
+        }
+
+        if (ktime_to_ns(parent->rt_bandwidth.rt_period) < period)
+                return 0;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(tgi, &parent->children, siblings) {
+                if (tgi == tg)
+                        continue;
+
+                total += to_ratio(ktime_to_ns(tgi->rt_bandwidth.rt_period),
+                                tgi->rt_bandwidth.rt_runtime);
+        }
+        rcu_read_unlock();
+
+        return total + to_ratio(period, runtime) <
+                to_ratio(ktime_to_ns(parent->rt_bandwidth.rt_period),
+                                parent->rt_bandwidth.rt_runtime);
+}
+#elif defined CONFIG_USER_SCHED
 static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
 {
         struct task_group *tgi;
@@ -8247,6 +8279,7 @@ static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
 
         return total + to_ratio(period, runtime) < global_ratio;
 }
+#endif
 
 /* Must be called with tasklist_lock held */
 static inline int tg_has_rt_tasks(struct task_group *tg)