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help / color / mirror / Atom feedFrom: Peter Geoghegan <[email protected]>
To: [email protected]
Subject: pgsql: Make parallel nbtree index scans use an LWLock.
Date: Sat, 08 Mar 2025 16:11:11 +0000
Message-ID: <[email protected]> (raw)
Make parallel nbtree index scans use an LWLock.
Teach parallel nbtree index scans to use an LWLock (not a spinlock) to
protect the scan's shared descriptor state.
Preparation for an upcoming patch that will add skip scan optimizations
to nbtree. That patch will create the need to occasionally allocate
memory while the scan descriptor is locked, while copying datums that
were serialized by another backend.
Author: Peter Geoghegan <[email protected]>
Reviewed-By: Matthias van de Meent <[email protected]>
Discussion: https://postgr.es/m/CAH2-Wz=PKR6rB7qbx+Vnd7eqeB5VTcrW=iJvAsTsKbdG+kW_UA@mail.gmail.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/67fc4c9fd7fab7004b656e0cc27826c75d7ea7ad
Modified Files
--------------
src/backend/access/nbtree/nbtpreprocesskeys.c | 2 +-
src/backend/access/nbtree/nbtree.c | 27 +++++++++++++------------
src/backend/storage/lmgr/lwlock.c | 1 +
src/backend/utils/activity/wait_event_names.txt | 1 +
src/include/storage/lwlock.h | 1 +
5 files changed, 18 insertions(+), 14 deletions(-)
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