The log message when verifying young gen prints the name of the old generation:
void GenCollectedHeap::verify(VerifyOption option /* ignored */) {
log_debug(gc, verify)("%s", _old_gen->name());
_old_gen->verify();
log_debug(gc, verify)("%s", _old_gen->name());
_young_gen->verify();
log_debug(gc, verify)("RemSet");
rem_set()->verify();
}
void GenCollectedHeap::verify(VerifyOption option /* ignored */) {
log_debug(gc, verify)("%s", _old_gen->name());
_old_gen->verify();
log_debug(gc, verify)("%s", _old_gen->name());
_young_gen->verify();
log_debug(gc, verify)("RemSet");
rem_set()->verify();
}