Use rcu_read_lock_dont_migrate() and rcu_read_unlock_migrate() in bpf_iter_run_prog to obtain better performance when PREEMPT_RCU is not enabled. Signed-off-by: Menglong Dong --- v2: - use rcu_read_lock_dont_migrate() instead of rcu_migrate_disable() --- kernel/bpf/bpf_iter.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/kernel/bpf/bpf_iter.c b/kernel/bpf/bpf_iter.c index 0cbcae727079..6ac35430c573 100644 --- a/kernel/bpf/bpf_iter.c +++ b/kernel/bpf/bpf_iter.c @@ -705,13 +705,11 @@ int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx) migrate_enable(); rcu_read_unlock_trace(); } else { - rcu_read_lock(); - migrate_disable(); + rcu_read_lock_dont_migrate(); old_run_ctx = bpf_set_run_ctx(&run_ctx); ret = bpf_prog_run(prog, ctx); bpf_reset_run_ctx(old_run_ctx); - migrate_enable(); - rcu_read_unlock(); + rcu_read_unlock_migrate(); } /* bpf program can only return 0 or 1: -- 2.50.1