Re: Reducing the chunk header sizes on all memory context types - Mailing list pgsql-hackers

David Rowley <dgrowleyml@gmail.com> writes:
> On Wed, 10 Aug 2022 at 09:23, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> Hmm, I suppose you mean we could reduce 4) if we needed to.  Yeah, that
>> seems like a reasonable place to buy more bits later if we run out of
>> MemoryContextMethodIDs.  Should be fine then.

> I think he means 3).  If 4) was reduced then that would further reduce
> the maxBlockSize we could pass when creating a context.  At least for
> aset.c and generation.c, we don't really need 3) to be 30-bits wide as
> the set->allocChunkLimit is almost certainly much smaller than that.

Oh, I see: we'd just be further constraining the size of chunk that
has to be pushed out as an "external" chunk.  Got it.

            regards, tom lane