Re: Add 64-bit XIDs into PostgreSQL 15

Maxim Orlov <orlovmg@gmail.com>

From: Maxim Orlov <orlovmg@gmail.com>

To: Bruce Momjian <bruce@momjian.us>

Cc: Robert Haas <robertmhaas@gmail.com>, Heikki Linnakangas <hlinnaka@iki.fi>, Andres Freund <andres@anarazel.de>, Yura Sokolov <y.sokolov@postgrespro.ru>, Evgeny Voropaev <evgeny.voropaev@tantorlabs.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>, Andrey Borodin <x4mmm@yandex-team.ru>

Date: 2026-02-27T14:21:48Z

Lists: pgsql-hackers

Attachments

0001-Swicth-TransamVariables-oldestClogXid-to-FullTransac.patch (application/octet-stream) patch 0001
0002-Convert-macros-to-static-inline-functions-clog.c.patch (application/octet-stream) patch 0002
0003-WIP-make-clog-64-bit.patch (application/octet-stream) patch 0003

I just wanted to share my work-in-progress on switching the clog to 64
bits. So far, I've only dealt with the clog itself. Right now, support
for the x86 platform is lacking. But the first two patches are
refactorings and can be committed promptly.

What are your thoughts on this?

-- 
Best regards,
Maxim Orlov.

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Add SLRU tests for 64-bit page case
- a60b8a58f435 17.0 landed
Make use FullTransactionId in 2PC filenames
- 5a1dfde8334b 17.0 landed
Use larger segment file names for pg_notify
- 2cdf131c46e6 17.0 landed
Index SLRUs by 64-bit integers rather than by 32-bit integers
- 4ed8f0913bfd 17.0 landed