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pgsql: Convert FixedParallelState->last_xlog_end to an atomic variable.

From:	Nathan Bossart <nathan(at)postgresql(dot)org>
To:	pgsql-committers(at)lists(dot)postgresql(dot)org
Subject:	pgsql: Convert FixedParallelState->last_xlog_end to an atomic variable.
Date:	2026-09-04 14:49:08
Message-ID:	E1x2VE3-00000003SrI-0d6X@gemulon.postgresql.org
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Convert FixedParallelState->last_xlog_end to an atomic variable.

Currently, this variable is an XLogRecPtr protected by a spinlock.
By converting it to an atomic variable, we can remove the spinlock.

Reviewed-by: Zsolt Parragi <zsolt(dot)parragi(at)percona(dot)com>
Tested-by: solai v <solai(dot)cdac(at)gmail(dot)com>
Discussion: https://postgr.es/m/alAJeRRzehDjLaF1%40nathan

Branch
------
master

Modified Files
--------------
src/backend/access/transam/parallel.c | 22 ++++++++--------------
1 file changed, 8 insertions(+), 14 deletions(-)

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