* Should not assign requested resources at first.
* they could be adjacent, so later reassign can not reallocate
* them one by one in parent resource window.
- * Try to assign requested + add_size at begining
+ * Try to assign requested + add_size at beginning
* if could do that, could get out early.
* if could not do that, we still try to assign requested at first,
* then try to reassign add_size for some resources.