Subject: [DEBUG PATCH] sched/fair: add profile for distribute_cfs_runtime()

---
 kernel/sched/fair.c  | 10 ++++++++++
 kernel/sched/sched.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index d646451d617c1..a4e3780c076e3 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5922,10 +5922,12 @@ static int tg_unthrottle_up(struct task_group *tg, void *data)
 		cfs_rq->throttled_clock_self_time += delta;
 	}
 
+	rq->unthrottled_cfs_rq++;
 	/* Re-enqueue the tasks that have been throttled at this level. */
 	list_for_each_entry_safe(p, tmp, &cfs_rq->throttled_limbo_list, throttle_node) {
 		list_del_init(&p->throttle_node);
 		enqueue_task_fair(rq_of(cfs_rq), p, ENQUEUE_WAKEUP);
+		rq->unthrottled_task++;
 	}
 
 	/* Add cfs_rq with load or one or more already running entities to the list */
@@ -6192,6 +6194,9 @@ static bool distribute_cfs_runtime(struct cfs_bandwidth *cfs_b)
 	struct rq_flags rf;
 	struct rq *rq;
 	LIST_HEAD(local_unthrottle);
+	unsigned int unthrottled_rqs = 0;
+
+	trace_printk("cpu%d: begins\n", this_cpu);
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(cfs_rq, &cfs_b->throttled_cfs_rq,
@@ -6228,6 +6233,7 @@ static bool distribute_cfs_runtime(struct cfs_bandwidth *cfs_b)
 		if (cfs_rq->runtime_remaining > 0) {
 			if (cpu_of(rq) != this_cpu) {
 				unthrottle_cfs_rq_async(cfs_rq);
+				unthrottled_rqs++;
 			} else {
 				/*
 				 * We currently only expect to be unthrottling
@@ -6250,12 +6256,16 @@ static bool distribute_cfs_runtime(struct cfs_bandwidth *cfs_b)
 		struct rq *rq = rq_of(cfs_rq);
 
 		rq_lock_irqsave(rq, &rf);
+		rq->unthrottled_cfs_rq = rq->unthrottled_task = 0;
 
 		list_del_init(&cfs_rq->throttled_csd_list);
 
 		if (cfs_rq_throttled(cfs_rq))
 			unthrottle_cfs_rq(cfs_rq);
 
+		trace_printk("cpu%d: finishes. unthrottled rqs=%u, unthrottled_cfs_rq=%d, unthrottled_task=%d\n",
+				raw_smp_processor_id(), unthrottled_rqs,
+				rq->unthrottled_cfs_rq, rq->unthrottled_task);
 		rq_unlock_irqrestore(rq, &rf);
 	}
 	SCHED_WARN_ON(!list_empty(&local_unthrottle));
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 5c2af5a70163c..d004da2bc9071 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1309,6 +1309,8 @@ struct rq {
 #if defined(CONFIG_CFS_BANDWIDTH) && defined(CONFIG_SMP)
 	call_single_data_t	cfsb_csd;
 	struct list_head	cfsb_csd_list;
+	unsigned int            unthrottled_cfs_rq;
+	unsigned int            unthrottled_task;
 #endif
 };
 
-- 
2.39.5