The freeze map changes, besides being very important, seem to be one of
the patches with a high risk profile in 9.6. Robert had asked whether
I'd take a look. I thought it'd be a good idea to review that while
running tests for
For starters, I'm just going through the commits. It seems the relevant
a892234 Change the format of the VM fork to add a second bit per page.
77a1d1e Department of second thoughts: remove PD_ALL_FROZEN.
fd31cd2 Don't vacuum all-frozen pages.
7087166 pg_upgrade: Convert old visibility map format to new format.
ba0a198 Add pg_visibility contrib module.
did I miss anything important?
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