total_time

static VALUE
gc_profile_total_time(VALUE self)
{
    double time = 0;
    rb_objspace_t *objspace = &rb_objspace;

    if (objspace->profile.run && objspace->profile.next_index > 0) {
        size_t i;
        size_t count = objspace->profile.next_index;

        for (i = 0; i < count; i++) {
            time += objspace->profile.records[i].gc_time;
        }
    }
    return DBL2NUM(time);
}