Much larger old_heap than heap

[Loïc Hoguin]

> > Is there a technical reason as to why fullsweep_after cannot be set 
> > after the process has started? Is it possible to add? For some reason 
> > the heap flags can be set via process_flag but not this one.
> 
> It should be relatively easy to add. It is just a matter of changing a value within the process's struct.
> 
> I think the reason why it does not exist right now is that no one has needed it enough to implement the feature :)

Thanks! I went ahead with this:

  https://github.com/erlang/otp/pull/4651

Now to use it.

-- 
Loïc Hoguin