Re: [PING] fallocate() causes btrfs to never compress postgresql files

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
Cc: Jakub Wartak <jakub(dot)wartak(at)enterprisedb(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Dimitrios Apostolou <jimis(at)gmx(dot)net>, Magnus Hagander <magnus(at)hagander(dot)net>, Tomas Vondra <tomas(at)vondra(dot)me>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Andres Freund <andres(at)anarazel(dot)de>, Melanie Plageman <melanieplageman(at)gmail(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, David Rowley <dgrowleyml(at)gmail(dot)com>
Subject: Re: [PING] fallocate() causes btrfs to never compress postgresql files
Date: 2026-02-06 15:33:55
Message-ID: e1f0cd3b-0164-45f5-9705-e922e59df90f@dunslane.net
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On 2026-02-06 Fr 10:11 AM, Tom Lane wrote:
> Thomas Munro <thomas(dot)munro(at)gmail(dot)com> writes:
>> BTW the rest of the patches will reemerge for master, but for the
>> minimal one back-patched: crake complains about an ABI break due to
>> GUC table changes. Of course adding a GUC to the stable branches is
>> unusual and we discussed the need for it in this case. Is that
>> expected? In what way is it part of the ABI? How would one determine
>> in advance that the ABI checker will complain?
> We have very little experience so far with libabigail, so there's
> not any store of knowledge hereabouts on what it'll complain about.
>
> The message is complaining that sizeof(ConfigureNamesEnum) changed,
> which it did, but I don't see how that value would be visible to
> external modules. So maybe a bug in libabigail?
>
>

I guess because of this in guc_tables.h:

extern PGDLLIMPORT struct config_generic ConfigureNames[];

cheers

andrew

--
Andrew Dunstan
EDB: https://www.enterprisedb.com

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