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Re: Add missing JIT inline pass for llvm>=17

Michael Banck <mbanck@gmx.net>

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From: Michael Banck <mbanck@gmx.net>
To: Álvaro Herrera <alvherre@kurilemu.de>
Cc: Andreas Karlsson <andreas@proxel.se>, Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2026-01-16T09:29:59Z
Lists: pgsql-hackers 
Hi,

On Thu, Jan 15, 2026 at 12:26:23PM +0100, Álvaro Herrera wrote:
> On 2026-Jan-15, Andreas Karlsson wrote:
> > Great find! Sadly shows how little people actually use JIT.
> 
> I disagree.  Given that JIT is enabled by default, I think lots of
> people use it. 

Well, not sure about that - all of the three major hyperscalers disable
JIT in their managed Postgres offerings (or at least used to when I last
checked), and those are a major chunk of usage these days. Also, both
the RPM and (since recently) the Debian/Ubuntu community packages have
factored out the LLVM/jit part into their own packages and AFAIK they do
not get installed by default.

So while the GUC is on by default, a lot of users might not use JIT
these days and not know either way.

> What they don't do, is realize that things are slower
> than they could be -- much less try to figure out why.

Right.


Michael

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  1. jit: Add missing inline pass for LLVM >= 17.