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

On Tue, Mar 17, 2026 at 5:05 AM Kirill Reshke <reshkekirill@gmail.com> wrote:
>
> > From 788860ded375fcf744201347b9dcbf496070bfb5 Mon Sep 17 00:00:00 2001
> > From: Melanie Plageman <melanieplageman@gmail.com>
> > Date: Wed, 25 Feb 2026 16:48:19 -0500
> > Subject: [PATCH v39 02/12] Add pruning fast path for all-visible and
>  all-frozen pages
>
> For the record, does this work with DISABLE_PAGE_SKIPPING? I think we
> don't  want the server to "fast-path" in case this option is set by
> the user...

Hmm. This is a good point. The docs for DISABLE_PAGE_SKIPPING say it
is about fixing visibility map corruption and the fast path does
detect and fix one type of visibility map corruption. It does not
investigate for dead line pointers, though. I suppose
DISABLE_PAGE_SKIPPING would want to also do that kind of VM corruption
detection. Thanks for thinking of that. Attached v40 adds an option to
disable the fast path.

- Melanie