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Subject[PATCH 06/10] sched: debug: add some rt debug output
Also display rt_rq information in /proc/sched_debug

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
kernel/sched_debug.c | 40 +++++++++++++++++++++++++++++++++++++---
kernel/sched_rt.c | 14 ++++++++++++++
2 files changed, 51 insertions(+), 3 deletions(-)
Index: linux-2.6/kernel/sched_debug.c
===================================================================
--- linux-2.6.orig/kernel/sched_debug.c
+++ linux-2.6/kernel/sched_debug.c
@@ -119,9 +119,7 @@ void print_cfs_rq(struct seq_file *m, in
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, in
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, in
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
#undef PN

print_cfs_stats(m, cpu);
+ print_rt_stats(m, cpu);

print_rq(m, rq, cpu);
}
Index: linux-2.6/kernel/sched_rt.c
===================================================================
--- linux-2.6.orig/kernel/sched_rt.c
+++ linux-2.6/kernel/sched_rt.c
@@ -1447,3 +1447,17 @@ static const struct sched_class rt_sched
.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
--



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