lgrp_rsets_copy
lgrp_rsets_copy(rset, rset_saved);
lgrp_rsets_copy(rset_saved, rset_new);
lgrp_rsets_copy(cur->lgrp_set, rset_saved);
lgrp_rsets_copy(rset_new, cur->lgrp_set);
lgrp_rsets_copy(child->lgrp_set, rset);