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From: Nathan Bossart <nathandbossart@gmail.com>
To: Andres Freund <andres@anarazel.de>
Cc: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Cc: Sami Imseih <samimseih@gmail.com>
Cc: Rahila Syed <rahilasyed90@gmail.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: Improve LWLock tranche name visibility across backends
Date: Tue, 19 Aug 2025 13:31:35 -0500
Message-ID: <aKTDB5mvSowmC0Lf@nathan> (raw)
In-Reply-To: <34drxi6kshtzu5aerftjflrm6wfxxw54emyvy4gqemdpxxuhvm@gymw6its72o7>
References: <CAA5RZ0tm6UFuY43-=fB-JtDEten3gA6tMCH1zLv+R9FT=MDApg@mail.gmail.com>
	<CAA5RZ0ukmNd+C1jH4V6BGEea-wmyLxDtDE5QoEtfXd2W5HNHfQ@mail.gmail.com>
	<aKL1w6tczBqsqLiJ@ip-10-97-1-34.eu-west-3.compute.internal>
	<CAA5RZ0uuWWL5z80KEs95Evy9CrQqnR6vY91BmFor5YmEf06j=w@mail.gmail.com>
	<CAA5RZ0vPcUb68h16ueg=A1R4ps=qU74jvG8N2xaX97DAK-E7_A@mail.gmail.com>
	<aKOeMUjcv9Gozyyg@nathan>
	<CAA5RZ0viNsKqjSuJ8fo74SJrf0uMi=igOn5WrtNYmVqYVh5h-w@mail.gmail.com>
	<aKQxUS6rtMzCkEia@ip-10-97-1-34.eu-west-3.compute.internal>
	<aKS0auEl4UUlt7XO@nathan>
	<34drxi6kshtzu5aerftjflrm6wfxxw54emyvy4gqemdpxxuhvm@gymw6its72o7>

On Tue, Aug 19, 2025 at 02:06:50PM -0400, Andres Freund wrote:
> Possibly stupid question - is it really worth having a dynamic structure here?
> The number of tranches is strictly bound, it seems like it'd be simpler to
> have an array of tranch nmes in shared memory.

Tranches can be allocated post-startup with LWLockNewTrancheId() (e.g.,
autoprewarm).

-- 
nathan





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