pmc_start
int pmc_start(pmc_id_t _pmc);
if (pmc_start(pmcid) < 0)
static int pmc_start(struct pmc *pm);
error = pmc_start(pm);
if (pmc_start(ev->ev_pmcid) < 0) {
if (pmc_start(ev->ev_pmcid) < 0) {