Re: Injection points: preloading and runtime arguments

From: Michael Paquier <michael(at)paquier(dot)xyz>
To: "Andrey M(dot) Borodin" <x4mmm(at)yandex-team(dot)ru>
Cc: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Postgres hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Injection points: preloading and runtime arguments
Date: 2024-08-06 07:47:15
Message-ID: ZrHVA4rq2e0fHDig@paquier.xyz
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On Sun, Aug 04, 2024 at 01:02:22AM +0900, Michael Paquier wrote:
> On Fri, Aug 02, 2024 at 07:03:58PM +0300, Andrey M. Borodin wrote:
> > The test works fine with SQL interface “select
> > injection_points_load('get-new-multixact-id');”.
>
> Yes, just use a load() here to make sure that the DSM required by the
> waits are properly initialized before entering in the critical section
> where the wait of the point get-new-multixact-id happens.

Hmm. How about loading injection_points with shared_preload_libraries
now that it has a _PG_init() thanks to 75534436a477 to take care of
the initialization you need here? We could add two hooks to request
some shmem based on a size and to do the shmem initialization.
--
Michael

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