sched: debug: add some rt debug output

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Daniel K." <dk@uw.no>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 51 insertions, 3 deletions

diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 8bb713040ac9..8e077b9c91cb 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -119,9 +119,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
         struct sched_entity *last;
         unsigned long flags;
 
-#if !defined(CONFIG_CGROUP_SCHED) || !defined(CONFIG_USER_SCHED)
-        SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
-#else
+#if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
         char path[128] = "";
         struct cgroup *cgroup = NULL;
         struct task_group *tg = cfs_rq->tg;
@@ -133,6 +131,8 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
                 cgroup_path(cgroup, path, sizeof(path));
 
         SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
+#else
+        SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
 #endif
 
         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "exec_clock",
@@ -169,6 +169,39 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
                         cfs_rq->nr_spread_over);
 }
 
+void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
+{
+#if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
+        char path[128] = "";
+        struct cgroup *cgroup = NULL;
+        struct task_group *tg = rt_rq->tg;
+
+        if (tg)
+                cgroup = tg->css.cgroup;
+
+        if (cgroup)
+                cgroup_path(cgroup, path, sizeof(path));
+
+        SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
+#else
+        SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
+#endif
+
+
+#define P(x) \
+        SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(rt_rq->x))
+#define PN(x) \
+        SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
+
+        P(rt_nr_running);
+        P(rt_throttled);
+        PN(rt_time);
+        PN(rt_runtime);
+
+#undef PN
+#undef P
+}
+
 static void print_cpu(struct seq_file *m, int cpu)
 {
         struct rq *rq = &per_cpu(runqueues, cpu);
@@ -208,6 +241,7 @@ static void print_cpu(struct seq_file *m, int cpu)
 #undef PN
 
         print_cfs_stats(m, cpu);
+        print_rt_stats(m, cpu);
 
         print_rq(m, rq, cpu);
 }
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index fee5fa7c72db..2e0ccdcf046a 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1444,3 +1444,17 @@ static const struct sched_class rt_sched_class = {
         .prio_changed           = prio_changed_rt,
         .switched_to            = switched_to_rt,
 };
+
+#ifdef CONFIG_SCHED_DEBUG
+extern void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq);
+
+static void print_rt_stats(struct seq_file *m, int cpu)
+{
+        struct rt_rq *rt_rq;
+
+        rcu_read_lock();
+        for_each_leaf_rt_rq(rt_rq, cpu_rq(cpu))
+                print_rt_rq(m, cpu, rt_rq);
+        rcu_read_unlock();
+}
+#endif