New Feature: Arbitrary deadlines.2012.2

Added support for arbitrary deadlines.

Constraint: Relative deadline must be >= exec cost.

Use: Set relative deadline in rt_task::rdeadline. Set value to 0
     to default to implicit deadlines.

Limitations: PFAIR not supported by this patch. PFAIR updated to
     reject tasks that do not have implicit deadlines.

1 files changed, 7 insertions, 0 deletions

diff --git a/litmus/sched_pfair.c b/litmus/sched_pfair.c
index 16f1065bbdca..72c06a492ef9 100644
--- a/litmus/sched_pfair.c
+++ b/litmus/sched_pfair.c
@@ -850,6 +850,13 @@ static long pfair_admit_task(struct task_struct* t)
             cpu_cluster(pstate[task_cpu(t)]))
                 return -EINVAL;
 
+        if (get_rt_period(t) != get_rt_relative_deadline(t)) {
+                printk(KERN_INFO "%s: Admission rejected. "
+                        "Only implicit deadlines are currently supported.\n",
+                        litmus->plugin_name);
+                return -EINVAL;
+        }
+
         /* Pfair is a tick-based method, so the time
          * of interest is jiffies. Calculate tick-based
          * times for everything.