Re: COPY FREEZE and setting PD_ALL_VISIBLE/visibility map bits

Hi,

On 2019-04-04 12:23:08 -0700, Andres Freund wrote:
> Also, how is this code even close to correct?
> CheckAndSetPageAllVisible() modifies the buffer in a crucial way, and
> there's no WAL logging? Without even a comment arguing why that's OK (I
> don't think it is)?

Peter Geoghegan just reminded me over IM that there's actually logging
inside log_heap_visible(), called from visibilitymap_set(). Still lacks
a critical section though.

I still think this is the wrong architecture.

Greetings,

Andres Freund

PS: We're going to have to revamp visibilitymap_set() soon-ish - the
fact that it directly calls heap routines inside is bad, means that
additional AMs e.g. zheap has to reimplement that routine.