common_usage
void common_usage(const char *tool, const char *mode,
common_usage("osnoise", "hist", "a per-cpu histogram of the OS noise",
common_usage(tool, mode, desc, msg_start, msg_opts);
common_usage("timerlat", "hist", "a per-cpu histogram of the timer latency",
common_usage("timerlat", "top", "a per-cpu summary of the timer latency",