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bpf: use rcu_read_lock_dont_migrate() for bpf_cgrp_storage_free()

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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>
Link: https://lore.kernel.org/r/20250821090609.42508-3-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Menglong Dong
2025-08-25 18:52:16 -07:00
committed by Alexei Starovoitov
parent 1b93c03fb3
commit 8c0afc7c9c
1 changed files with 2 additions and 4 deletions
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kernel/bpf/bpf_cgrp_storage.c
+2 -4
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@@ -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 *