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From: Nathan Bossart <nathandbossart@gmail.com>
To: Andres Freund <andres@anarazel.de>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Alexander Lakhin <exclusion@gmail.com>
Cc: Sami Imseih <samimseih@gmail.com>
Cc: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Cc: Robert Treat <rob@xzilla.net>
Cc: satyanarlapuram@gmail.com, pgsql-hackers <pgsql-hackers@postgresql.org>
Cc: tndrwang@gmail.com
Subject: Re: Add pg_stat_autovacuum_priority
Date: Wed, 8 Apr 2026 16:23:45 -0500
Message-ID: <adbHYQMZ0pHQttWa@nathan> (raw)
In-Reply-To: <u3akkfw3vaocviudt6f7ft4kxjc2273rh3tfhz5rfwg6jrcc2t@wurwws6wgjjz>
References: <adFiCgN22xJ7Z-oR@nathan>
	<CAA5RZ0vRP-W2wJD2OxEb-=VGj2sp5pMCqHQg9YJiuDVPhaY5jQ@mail.gmail.com>
	<adQsdvPPNviWMCXb@nathan>
	<5684f479-858e-4c5d-b8f5-bcf05de1f909@gmail.com>
	<3077290.1775668665@sss.pgh.pa.us>
	<adaWuTR7oCKodH7k@nathan>
	<3097984.1775674400@sss.pgh.pa.us>
	<adan_E0o69p81lIj@nathan>
	<3101163.1775676098@sss.pgh.pa.us>
	<u3akkfw3vaocviudt6f7ft4kxjc2273rh3tfhz5rfwg6jrcc2t@wurwws6wgjjz>

On Wed, Apr 08, 2026 at 04:40:03PM -0400, Andres Freund wrote:
> Note that the whole cached state does automatically get reset at the end of
> the transaction (AtEOXact_PgStat()->pgstat_clear_snapshot()), just like it did
> before the shmem stats stuff.

I see a lot of memory used for the pgStatEntryRefHash table, too (e.g., ~16
MB for 100K tables).  What's interesting is that I cannot reproduce similar
usage with views like pg_stat_all_tables.  If memory was not a concern, I
think the "bool *may_free" idea would be fine.  But assuming it is, we will
probably need to do something more creative.

-- 
nathan





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