linux-kernel - [PATCH] sched,fair: use list_for_each_entry() in print_cfs

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Date:   Sat, 26 Sep 2020 03:10:19 +0800
From:   Hui Su <sh_def@....com>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        linux-kernel@...r.kernel.org
Subject: [PATCH] sched,fair: use list_for_each_entry() in print_cfs_stats()

Macro for_each_leaf_cfs_rq_safe() use list_for_each_entry_safe(),
which can against removal of list entry, but we only
print the cfs_rq data and won't remove the list entry in
print_cfs_stats().

Thus, add macro for_each_leaf_cfs_rq() based on
list_for_each_entry(), and use for_each_leaf_cfs_rq() in
print_cfs_stats().

Signed-off-by: Hui Su <sh_def@....com>
---
 kernel/sched/fair.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1a68a0536add..d40dfb4349b0 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -391,11 +391,16 @@ static inline void assert_list_leaf_cfs_rq(struct rq *rq)
 	SCHED_WARN_ON(rq->tmp_alone_branch != &rq->leaf_cfs_rq_list);
 }
 
-/* Iterate thr' all leaf cfs_rq's on a runqueue */
+/* Iterate thr' all leaf cfs_rq's on a runqueue safely */
 #define for_each_leaf_cfs_rq_safe(rq, cfs_rq, pos)			\
 	list_for_each_entry_safe(cfs_rq, pos, &rq->leaf_cfs_rq_list,	\
 				 leaf_cfs_rq_list)
 
+/* Iterate thr' all leaf cfs_rq's on a runqueue */
+#define for_each_leaf_cfs_rq(rq, cfs_rq)			\
+	list_for_each_entry(cfs_rq, &rq->leaf_cfs_rq_list,	\
+				 leaf_cfs_rq_list)
+
 /* Do the two (enqueued) entities belong to the same group ? */
 static inline struct cfs_rq *
 is_same_group(struct sched_entity *se, struct sched_entity *pse)
@@ -11185,10 +11190,10 @@ const struct sched_class fair_sched_class
 #ifdef CONFIG_SCHED_DEBUG
 void print_cfs_stats(struct seq_file *m, int cpu)
 {
-	struct cfs_rq *cfs_rq, *pos;
+	struct cfs_rq *cfs_rq;
 
 	rcu_read_lock();
-	for_each_leaf_cfs_rq_safe(cpu_rq(cpu), cfs_rq, pos)
+	for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq)
 		print_cfs_rq(m, cpu, cfs_rq);
 	rcu_read_unlock();
 }
-- 
2.25.1