Use rcu_read_lock_dont_migrate() and rcu_read_unlock_migrate() in
bpf_cgrp_storage_free to obtain better performance when PREEMPT_RCU is
not enabled.
Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
---
v2:
- use rcu_read_lock_dont_migrate() instead of rcu_migrate_disable()
---
kernel/bpf/bpf_cgrp_storage.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/kernel/bpf/bpf_cgrp_storage.c b/kernel/bpf/bpf_cgrp_storage.c
index 148da8f7ff36..0687a760974a 100644
--- a/kernel/bpf/bpf_cgrp_storage.c
+++ b/kernel/bpf/bpf_cgrp_storage.c
@@ -45,8 +45,7 @@ void bpf_cgrp_storage_free(struct cgroup *cgroup)
{
struct bpf_local_storage *local_storage;
- migrate_disable();
- rcu_read_lock();
+ rcu_read_lock_dont_migrate();
local_storage = rcu_dereference(cgroup->bpf_cgrp_storage);
if (!local_storage)
goto out;
@@ -55,8 +54,7 @@ void bpf_cgrp_storage_free(struct cgroup *cgroup)
bpf_local_storage_destroy(local_storage);
bpf_cgrp_storage_unlock();
out:
- rcu_read_unlock();
- migrate_enable();
+ rcu_read_unlock_migrate();
}
static struct bpf_local_storage_data *
--
2.50.1