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Subject[RFC][PATCH 06/11] sched: add the sched-debug bits for sched_dl.
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Date
Add the typical debugging output provided by sched_deug (if enabled)
also to the sched_dl class.

Signed-off-by: Dario Faggioli <raistlin@linux.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@ekiga.net /
dario.faggioli@jabber.org
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