chgvmmcnt
if (!chgvmmcnt(cred->cr_ruidinfo, 1, vm_maxvmms)) {
(void)chgvmmcnt(cred->cr_ruidinfo, -1, 0);
chgvmmcnt(sc->ucred->cr_ruidinfo, -1, 0);
int chgvmmcnt(struct uidinfo *uip, int diff, rlim_t max);