filter_event_early
int filter_event_early(void *data, const struct perf_dlfilter_sample *sample, void *ctx);
d->filter_event_early = dlsym(d->handle, "filter_event_early");
ret = d->filter_event_early(d->data, &d_sample, d);
int (*filter_event_early)(void *data,
if (!d || !d->filter_event_early)