diff mbox series

[RFC,11/12] cgroup: Mark the rstat percpu lock as terminal

Message ID 1541709268-3766-12-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. 8, 2018, 8:34 p.m. UTC 
By classifying the cgroup rstat percpu locks as terminal locks, it
reduces the lockdep overhead when these locks are being used.

Signed-off-by: Waiman Long <longman@redhat.com>
---
 kernel/cgroup/rstat.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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Patch

diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index d503d1a..47f7ffb 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -291,8 +291,13 @@  void __init cgroup_rstat_boot(void)
 {
 	int cpu;
 
-	for_each_possible_cpu(cpu)
-		raw_spin_lock_init(per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu));
+	for_each_possible_cpu(cpu) {
+		raw_spinlock_t *cgroup_rstat_percpu_lock =
+				per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu);
+
+		raw_spin_lock_init(cgroup_rstat_percpu_lock);
+		lockdep_set_terminal_class(cgroup_rstat_percpu_lock);
+	}
 
 	BUG_ON(cgroup_rstat_init(&cgrp_dfl_root.cgrp));
 }