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help / color / mirror / Atom feedFrom: Robert Haas <[email protected]>
To: Mark Dilger <[email protected]>
Cc: Lukas Fittl <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: pg_plan_advice
Date: Fri, 27 Mar 2026 10:20:30 -0400
Message-ID: <CA+TgmoY79RwaFyXpcMvniLUSKbC19mYpr9pXy8inuDZCzagk4A@mail.gmail.com> (raw)
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On Thu, Mar 26, 2026 at 7:21 PM Mark Dilger
<[email protected]> wrote:
> Then every single query that triggers advice collection will:
> 1. Successfully allocate an advice entry from existing free space
> 2. Enter store_shared_advice, hit the same chunk boundary
> 3. Fail to allocate the chunk
> 4. Leak the advice entry
> 5. Reduce remaining free space in the small size classes
Yeah, that's a leak. I just got through trying to harden
pg_stash_advice so that kind of thing can't happen, but I failed to
realize that pg_collect_advice has a version of the same issue.
Thanks,
--
Robert Haas
EDB: http://www.enterprisedb.com
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Subject: Re: pg_plan_advice
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