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base repository: postgresql-cfbot/postgresql
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  • 2 commits
  • 7 files changed
  • 2 contributors

Commits on Jun 22, 2025

  1. Read-Write optimistic spin lock. 

    There are couple of places where spin lock is used just to separate
readers and writers. And there are a lot of readers and one or few writers.
Those places are source of contention in a huge system setups because
readers create bottleneck on always exclusive slock_t.

Mitigate it by introducing read-write optimistic spin lock.
Read is performed without any write operation on lock itself. Correctness
of read is checked by comparing lock version before and after read.

Use this RWSpin lock in sending invalidations and notifies of walsenders.

If no native 64bit atomic support present, fallback to regular spin lock.
    @funny-falcon
    funny-falcon authored and Commitfest Bot committed Jun 22, 2025
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  2. [CF 5573] v5 - Introduce RWSpin lock and use it in sinvaladt.c and xl… 

    …ogrecovery.c

This branch was automatically generated by a robot using patches from an
email thread registered at:

https://commitfest.postgresql.org/patch/5573

The branch will be overwritten each time a new patch version is posted to
the thread, and also periodically to check for bitrot caused by changes
on the master branch.

Patch(es): https://www.postgresql.org/message-id/51a26cb8-d2ae-4135-98e2-80d7feb163c0@postgrespro.ru
Author(s): Yura Sokolov
    Commitfest Bot committed Jun 22, 2025
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