The only times I've had difficulty solving a fragmentation problem was because a GC was involved, and rewriting the code in an effort to trick some enormous black box into doing what I wanted was a lot more difficult than just writing code that did what I wanted in the first place. ymmv.
I guess in theory fpgeek is right, and his great-grandparent post is in the vein of what I thought of answering. But I guess in practice tedunangst is more right at the moment.
