Commit 8c0afc7c authored by Menglong Dong's avatar Menglong Dong Committed by Alexei Starovoitov
Browse files

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: default avatarMenglong Dong <dongml2@chinatelecom.cn>
Link: https://lore.kernel.org/r/20250821090609.42508-3-dongml2@chinatelecom.cn


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 1b93c03f

kernel/bpf/bpf_cgrp_storage.c

+2 −4
Original line number Diff line number Diff line
@@ -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 *