Re: Reducing the chunk header sizes on all memory context types

On Mon, 29 Aug 2022 at 21:37, Amit Kapila <amit.kapila16@gmail.com> wrote:
> 2022-08-29 03:29:56.911 EDT [1056:67] pg_regress/ddl STATEMENT:
> SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,
> NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
> TRAP: FailedAssertion("pointer == (void *) MAXALIGN(pointer)", File:
> "../../../../src/include/utils/memutils_internal.h", Line: 120, PID:
> 1056)

I suspect, going by all 3 failing animals being 32-bit which have a
MAXIMUM_ALIGNOF 8 and SIZEOF_SIZE_T of 4 that this is due to the lack
of padding in the MemoryChunk struct.

AllocChunkData and GenerationChunk had padding to account for
sizeof(Size) being 4 and sizeof(void *) being 8, I didn't add that to
MemoryChunk, so I'll do that now.

David