Re: XID formatting and SLRU refactorings (was: Add 64-bit XIDs into PostgreSQL 15) - Mailing list pgsql-hackers

Hi,

On 2022-03-18 18:14:52 +0300, Maxim Orlov wrote:
> Subject: [PATCH v22 3/6] Use 64-bit pages in SLRU
> 
> This is one step toward 64-bit XIDs.

I think this should explain in more detail why this move is done. Neither the
commit message nor the rest of the thread does so afaics. It's not too hard to
infer, but the central reason behind a patch shouldn't need to be inferred.


> -static bool CLOGPagePrecedes(int page1, int page2);
> +static bool CLOGPagePrecedes(int64 page1, int64 page2);

I think all of these are actually unsigned integers. If all of this stuff gets
touched, perhaps worth moving to uint64 instead?

https://www.postgresql.org/message-id/20220318231430.m5g56yk4ztlz2man%40alap3.anarazel.de

Greetings,

Andres Freund