GSN-EDF: log relinking decisions

For debugging, make relinking optimizations available in the TRACE() log.

1 files changed, 9 insertions, 0 deletions

diff --git a/litmus/sched_gsn_edf.c b/litmus/sched_gsn_edf.c
index 08069abe1c..b8dc0b1f8e 100644
--- a/litmus/sched_gsn_edf.c
+++ b/litmus/sched_gsn_edf.c
@@ -179,6 +179,9 @@ static noinline void link_task_to_cpu(struct task_struct* linked,
                          * the caller to get things right.
                          */
                         if (entry != sched) {
+                                TRACE_TASK(linked, 
+                                           "already scheduled on %d, updating link.\n", 
+                                           sched->cpu);
                                 tmp = sched->linked;
                                 linked->rt_param.linked_on = sched->cpu;
                                 sched->linked = linked;
@@ -190,6 +193,10 @@ static noinline void link_task_to_cpu(struct task_struct* linked,
                         linked->rt_param.linked_on = entry->cpu;
         }
         entry->linked = linked;
+        if (linked)
+                TRACE_TASK(linked, "linked to %d.\n", entry->cpu);
+        else
+                TRACE("NULL linked to %d.\n", entry->cpu);
         update_cpu_position(entry);
 }
 
@@ -409,6 +416,8 @@ static struct task_struct* gsnedf_schedule(struct task_struct * prev)
         sleep       = exists && get_rt_flags(entry->scheduled) == RT_F_SLEEP;
         preempt     = entry->scheduled != entry->linked;
 
+        TRACE_TASK(prev, "invoked gsnedf_schedule.\n");
+
         if (exists)
                 TRACE_TASK(prev, 
                            "blocks:%d out_of_time:%d np:%d sleep:%d preempt:%d "