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Some sockets suffer from heavy false sharing on sk->sk_drops, and fields in the same cache line. Add sk->sk_drop_counters to: - move the drop counter(s) to dedicated cache lines. - Add basic NUMA awareness to these drop counter(s). Following patches will use this infrastructure for UDP and RAW sockets. sk_clone_lock() is not yet ready, it would need to properly set newsk->sk_drop_counters if we plan to use this for TCP sockets. v2: used Paolo suggestion from https://lore.kernel.org/netdev/8f09830a-d83d-43c9-b36b-88ba0a23e9b2@redhat.com/ Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com> Link: https://patch.msgid.link/20250826125031.1578842-4-edumazet@google.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>