Tom Lane kirjoitti:
I'm also concerned about loss of debug traceability if these fields
disappear entirely from disk --- it's been handy more than once to be
able to tell where in a complex transaction something happened.

Sure. We'll just have to try to compensate that with debug messages etc., whatever scheme we choose.

Lastly, at least on machines with 8-byte MAXALIGN, removing four more
bytes from heap headers would save nothing.  So I'm not excited about
going through enormous pushups to get rid of both fields, when a far
simpler and better-performing mechanism suffices to remove one.

It would be a win on 32-bit architectures. And there has been discussion of
storing at least some data types unaligned.

Heikki Linnakangas

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