It's unnecessary to try to print stacks of blocked tasks in the case
that ndetected == 0. Furthermore, calling rcu_print_detail_task_stall()
causes to acquire rnp locks as many times as the number of leaf nodes
plus one for root node. It's unnecessary at all in the case.
Signed-off-by: Byungchul Park <byungchul.p...@lge.com>
---
kernel/rcu/tree.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 287f468..ab2f743 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1374,6 +1374,9 @@ static void print_other_cpu_stall(struct rcu_state *rsp,
unsigned long gpnum)
(long)rsp->gpnum, (long)rsp->completed, totqlen);
if (ndetected) {
rcu_dump_cpu_stacks(rsp);
+
+ /* Complain about tasks blocking the grace period. */
+ rcu_print_detail_task_stall(rsp);
} else {
if (READ_ONCE(rsp->gpnum) != gpnum ||
READ_ONCE(rsp->completed) == gpnum) {
@@ -1390,9 +1393,6 @@ static void print_other_cpu_stall(struct rcu_state *rsp,
unsigned long gpnum)
}
}
- /* Complain about tasks blocking the grace period. */
- rcu_print_detail_task_stall(rsp);
-
rcu_check_gp_kthread_starvation(rsp);
panic_on_rcu_stall();
--
1.9.1
