Here is a followup to it.
> Karel Zak <zakkr@zf.jcu.cz> writes:
> > Create from this non-used residual space chunk and remove it into free
> > chunk list.
>
> There's at least one bug in that code: the minimum acceptable chunk size
> is not MAXALIGN(1), but 1 << ALLOC_MINBITS, and after that it goes up by
> powers of 2. You are putting the chunk into a freelist based on which
> freelist would be used to allocate a request for X amount of space...
> but it had better go into a freelist based on being large enough for the
> largest request that would be directed to that freelist, instead. As is,
> the chunk could be handed out to someone who would scribble past the
> allocated end of the block.
>
> -----> A tested patch (hmm, we are freeze, possible for 7.0.?):
>
> It's getting pretty late in the cycle for this sort of thing.
> We should consider it for 7.1, after you get it right...
>
> regards, tom lane
>
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