linux-kernel - [RFC][PATCH 06/11] sched: add the sched-debug bits for sched

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Date:	Sun, 28 Feb 2010 20:22:09 +0100
From:	Raistlin <raistlin@...ux.it>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chris Friesen <cfriesen@...tel.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Henrik Austad <henrik@...tad.us>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Claudio Scordino <claudio@...dence.eu.com>,
	michael trimarchi <trimarchi@...is.sssup.it>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Tommaso Cucinotta <t.cucinotta@...up.it>,
	Juri Lelli <juri.lelli@...il.com>,
	Nicola Manica <nicola.manica@...il.com>,
	Luca Abeni <luca.abeni@...tn.it>
Subject: [RFC][PATCH 06/11] sched: add the sched-debug bits for sched_dl.

Add the typical debugging output provided by sched_deug (if enabled)
also to the sched_dl class.

Signed-off-by: Dario Faggioli <raistlin@...ux.it>
---
 kernel/sched_debug.c |   33 +++++++++++++++++++++++++++++++++
 kernel/sched_dl.c    |   26 ++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 0 deletions(-)

diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 67f95aa..407a761 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -246,6 +246,38 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 #undef P
 }
 
+void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
+{
+	s64 min_deadline = -1, max_deadline = -1;
+	struct rq *rq = &per_cpu(runqueues, cpu);
+	struct sched_dl_entity *last;
+	unsigned long flags;
+
+	SEQ_printf(m, "\ndl_rq[%d]:\n", cpu);
+
+	raw_spin_lock_irqsave(&rq->lock, flags);
+	if (dl_rq->rb_leftmost)
+		min_deadline = (rb_entry(dl_rq->rb_leftmost,
+					 struct sched_dl_entity,
+					 rb_node))->deadline;
+	last = __pick_dl_last_entity(dl_rq);
+	if (last)
+		max_deadline = last->deadline;
+	raw_spin_unlock_irqrestore(&rq->lock, flags);
+
+#define P(x) \
+	SEQ_printf(m, "  .%-30s: %Ld\n", #x, (long long)(x))
+#define PN(x) \
+	SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(x))
+
+	P(dl_rq->dl_nr_running);
+	PN(min_deadline);
+	PN(max_deadline);
+
+#undef PN
+#undef P
+}
+
 static void print_cpu(struct seq_file *m, int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
@@ -305,6 +337,7 @@ static void print_cpu(struct seq_file *m, int cpu)
 #endif
 	print_cfs_stats(m, cpu);
 	print_rt_stats(m, cpu);
+	print_dl_stats(m, cpu);
 
 	print_rq(m, rq, cpu);
 }
diff --git a/kernel/sched_dl.c b/kernel/sched_dl.c
index a1202ac..dee2668 100644
--- a/kernel/sched_dl.c
+++ b/kernel/sched_dl.c
@@ -44,6 +44,9 @@ static inline int dl_time_before(u64 a, u64 b)
 	return (s64)(a - b) < 0;
 }
 
+#define for_each_leaf_dl_rq(dl_rq, rq) \
+	for (dl_rq = &rq->dl; dl_rq; dl_rq = NULL)
+
 static void enqueue_dl_entity(struct sched_dl_entity *dl_se);
 static void dequeue_dl_entity(struct sched_dl_entity *dl_se);
 static void check_dl_preempt_curr(struct task_struct *p, struct rq *rq);
@@ -512,6 +515,16 @@ static void start_hrtick_dl(struct rq *rq, struct task_struct *p)
 }
 #endif
 
+static struct sched_dl_entity *__pick_dl_last_entity(struct dl_rq *dl_rq)
+{
+	struct rb_node *last = rb_last(&dl_rq->rb_root);
+
+	if (!last)
+		return NULL;
+
+	return rb_entry(last, struct sched_dl_entity, rb_node);
+}
+
 static struct sched_dl_entity *pick_next_dl_entity(struct rq *rq,
 						   struct dl_rq *dl_rq)
 {
@@ -676,3 +689,16 @@ static const struct sched_class dl_sched_class = {
 	.switched_to		= switched_to_dl,
 };
 
+#ifdef CONFIG_SCHED_DEBUG
+extern void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq);
+
+static void print_dl_stats(struct seq_file *m, int cpu)
+{
+	struct dl_rq *dl_rq = &cpu_rq(cpu)->dl;
+
+	rcu_read_lock();
+	for_each_leaf_dl_rq(dl_rq, cpu_rq(cpu))
+		print_dl_rq(m, cpu, dl_rq);
+	rcu_read_unlock();
+}
+#endif /* CONFIG_SCHED_DEBUG */
-- 
1.7.0

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
----------------------------------------------------------------------
Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa  (Italy)

http://blog.linux.it/raistlin / raistlin@...ga.net /
dario.faggioli@...ber.org

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