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bpf: use rcu_read_lock_dont_migrate() for bpf_iter_run_prog()

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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 <dongml2@chinatelecom.cn>
Link: https://lore.kernel.org/r/20250821090609.42508-5-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Menglong Dong 2025-08-21 17:06:06 +08:00 committed by Alexei Starovoitov
parent f2fa9b9069
commit 68748f0397
1 changed files with 2 additions and 4 deletions
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6
kernel/bpf/bpf_iter.c
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@ -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: