diff mbox series

[v2,16/17] delay_acct: Mark task's delays->lock as terminal spinlock

Message ID 1542653726-5655-17-git-send-email-longman@redhat.com (mailing list archive)
State New, archived
Headers show
Series locking/lockdep: Add a new class of terminal locks | expand

Commit Message

Waiman Long Nov. 19, 2018, 6:55 p.m. UTC 
By making task's delays->lock a terminal spinlock, it reduces the
lockdep overhead when this lock is used.

Signed-off-by: Waiman Long <longman@redhat.com>
---
 kernel/delayacct.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 2a12b98..49dd8d3 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -43,8 +43,10 @@  void delayacct_init(void)
 void __delayacct_tsk_init(struct task_struct *tsk)
 {
 	tsk->delays = kmem_cache_zalloc(delayacct_cache, GFP_KERNEL);
-	if (tsk->delays)
+	if (tsk->delays) {
 		raw_spin_lock_init(&tsk->delays->lock);
+		lockdep_set_terminal_class(&tsk->delays->lock);
+	}
 }
 
 /*