ring_buffer_poll_remote
int ring_buffer_poll_remote(struct trace_buffer *buffer, int cpu);
ring_buffer_poll_remote(remote->trace_buffer, RING_BUFFER_ALL_CPUS);
return ring_buffer_poll_remote(remote->trace_buffer, cpu) == 0;
ring_buffer_poll_remote(iter->remote->trace_buffer, iter->cpu);
ring_buffer_poll_remote(remote->trace_buffer, cpu);