PSN-EDF: add release master support

We can give up a processor under partitioning, too.

1 files changed, 28 insertions, 8 deletions

diff --git a/litmus/sched_psn_edf.c b/litmus/sched_psn_edf.c
index 71c02409efa2..eb444ecf1288 100644
--- a/litmus/sched_psn_edf.c
+++ b/litmus/sched_psn_edf.c
@@ -383,12 +383,6 @@ static unsigned int psnedf_get_srp_prio(struct task_struct* t)
         return get_rt_period(t);
 }
 
-static long psnedf_activate_plugin(void)
-{
-        get_srp_prio = psnedf_get_srp_prio;
-        return 0;
-}
-
 /* ******************** FMLP support ********************** */
 
 /* struct for semaphore with priority inheritance */
@@ -577,9 +571,35 @@ static long psnedf_allocate_lock(struct litmus_lock **lock, int type,
 
 #endif
 
+
+static long psnedf_activate_plugin(void)
+{
+#ifdef CONFIG_RELEASE_MASTER
+        int cpu;
+
+        for_each_online_cpu(cpu) {
+                remote_edf(cpu)->release_master = atomic_read(&release_master_cpu);
+        }
+#endif
+
+#ifdef CONFIG_LITMUS_LOCKING
+        get_srp_prio = psnedf_get_srp_prio;
+#endif
+
+        return 0;
+}
+
 static long psnedf_admit_task(struct task_struct* tsk)
 {
-        return task_cpu(tsk) == tsk->rt_param.task_params.cpu ? 0 : -EINVAL;
+        if (task_cpu(tsk) == tsk->rt_param.task_params.cpu
+#ifdef CONFIG_RELEASE_MASTER
+            /* don't allow tasks on release master CPU */
+             && task_cpu(tsk) != remote_edf(task_cpu(tsk))->release_master
+#endif
+                )
+                return 0;
+        else
+                return -EINVAL;
 }
 
 /*      Plugin object   */
@@ -593,9 +613,9 @@ static struct sched_plugin psn_edf_plugin __cacheline_aligned_in_smp = {
         .task_wake_up           = psnedf_task_wake_up,
         .task_block             = psnedf_task_block,
         .admit_task             = psnedf_admit_task,
+        .activate_plugin        = psnedf_activate_plugin,
 #ifdef CONFIG_LITMUS_LOCKING
         .allocate_lock          = psnedf_allocate_lock,
-        .activate_plugin        = psnedf_activate_plugin,
 #endif
 };