- Relation size cache was moved to extension
- the changes in visibilitymap.c and freespace.c became unnecessary
with v16, thanks to changes in upstream code
- WALProposer was moved to extension
- The hack in ReadBuffer_common to not throw an error on unexpected
data beyond EOF was removed in v16 rebase. We haven't seen such
errors, so I guess that was some early issue that was fixed long
time ago.
- The ginfast.c diff was made unnecessary by upstream commit 56b662523f
Reorganize existing READMEs and other documentation files into mdbook
format. The resulting Table of Contents is a mix of placeholders for
docs that we should write, and documentation files that we already had,
dropped into the most appropriate place.
Update the Pageserver overview diagram. Add sections on thread
management and WAL redo processes.
Add all the RFCs to the mdbook Table of Content too.
Per github issue #1979
