>>>   Oh, you have discovered a method to completely avoid memory
>>> fragmentation? :-o Is it efficient?
> 
>> Yes, and yes.
> 
>   That would mean that the memory allocation engine knows ahead of time
> the order in which objects will be "forgotten" (ie. nothing points to them
> anymore so they can be freed) so that it can group them in contiguous
> memory. Of course this is impossible (not even by analyzing the program
> because the order in which objects are "forgotten" may depend on things
> like user input).
> 
>   The only other alternative is that it performs memory defragmentation
> before freeing the objects. But that doesn't sound any faster than
> freeing the objects directly.

Go through memory, find all the dead objects, and *then* defrag the 
whole lot in a single pass. Done.

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