Re: eliminate xl_heap_visible to reduce WAL (and eventually set VM on-access) - Mailing list pgsql-hackers

On Tue, Sep 2, 2025 at 5:52 PM Melanie Plageman
<melanieplageman@gmail.com> wrote:
>
> On Thu, Aug 28, 2025 at 5:12 AM Kirill Reshke <reshkekirill@gmail.com> wrote:
> >
> > I did micro git-blame research here. I spotted only one related change
> > [0]. Looks like before this change pin was indeed needed.
> > But not after this change, so this visibilitymap_pin is just an oversight?
> > Related thread is [1]. I quickly checked the discussion in this
> > thread, and it looks like no one was bothered about these lines or VM
> > logging changes (in this exact pin buffer aspect). The discussion was
> > of other aspects of this commit.
>
> Wow, thanks so much for doing that research. Looking at it myself, it
> does indeed seem like just an oversight. It isn't harmful since it
> won't take another pin, but it is confusing, so I think we should at
> least remove it in master. I'm not as sure about back branches.

I've updated the commit message in the patch set to reflect the
research you did in attached v8.

- Melanie