alpha_perf_event_update
alpha_perf_event_update(pe, &pe->hw, cpuc->current_idx[j], 0);
alpha_perf_event_update(event, hwc, idx, 0);
alpha_perf_event_update(event, hwc, hwc->idx, 0);
alpha_perf_event_update(event, hwc, hwc->idx, 0);
alpha_perf_event_update(event, hwc, idx, alpha_pmu->pmc_max_period[idx]+1);