sched: debug: show a weight tree

Print a tree of weights.

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

1 files changed, 27 insertions, 0 deletions

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index d72e8b41b3e4..89fa32b4edf2 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1611,6 +1611,30 @@ static const struct sched_class fair_sched_class = {
 };
 
 #ifdef CONFIG_SCHED_DEBUG
+static void
+print_cfs_rq_tasks(struct seq_file *m, struct cfs_rq *cfs_rq, int depth)
+{
+        struct sched_entity *se;
+
+        if (!cfs_rq)
+                return;
+
+        list_for_each_entry_rcu(se, &cfs_rq->tasks, group_node) {
+                int i;
+
+                for (i = depth; i; i--)
+                        seq_puts(m, "  ");
+
+                seq_printf(m, "%lu %s %lu\n",
+                                se->load.weight,
+                                entity_is_task(se) ? "T" : "G",
+                                calc_delta_weight(SCHED_LOAD_SCALE, se)
+                                );
+                if (!entity_is_task(se))
+                        print_cfs_rq_tasks(m, group_cfs_rq(se), depth + 1);
+        }
+}
+
 static void print_cfs_stats(struct seq_file *m, int cpu)
 {
         struct cfs_rq *cfs_rq;
@@ -1618,6 +1642,9 @@ static void print_cfs_stats(struct seq_file *m, int cpu)
         rcu_read_lock();
         for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq)
                 print_cfs_rq(m, cpu, cfs_rq);
+
+        seq_printf(m, "\nWeight tree:\n");
+        print_cfs_rq_tasks(m, &cpu_rq(cpu)->cfs, 1);
         rcu_read_unlock();
 }
 #endif