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
pieces are:

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?


Andres Freund

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