From 8c0afc7c9c112eb6884bc7e443247f242b6d8a3e Mon Sep 17 00:00:00 2001 From: Menglong Dong Date: Thu, 21 Aug 2025 17:06:04 +0800 Subject: [PATCH] bpf: use rcu_read_lock_dont_migrate() for bpf_cgrp_storage_free() 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 Link: https://lore.kernel.org/r/20250821090609.42508-3-dongml2@chinatelecom.cn Signed-off-by: Alexei Starovoitov --- 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 148da8f7ff368..0687a760974a4 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 * -- 2.47.3