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Split use of SerialSLRULock, creating SerialControlLock

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predicate.c has been using SerialSLRULock (the control lock for its SLRU
structure) to coordinate access to SerialControlData, another of its
numerous shared memory structures; this is unnecessary and confuses
further SLRU scalability work.  Create a separate LWLock to cover
SerialControlData.

Extracted from a larger patch from the same author, and some additional
changes by Álvaro.

Author: Dilip Kumar <dilip.kumar@enterprisedb.com>
Discussion: https://postgr.es/m/CAFiTN-vzDvNz=ExGXz6gdyjtzGixKSqs0mKHMmaQ8sOSEFZ33A@mail.gmail.com
This commit is contained in:
Alvaro Herrera
2024-01-30 18:11:17 +01:00
parent 776621a5e4
commit 7b745d85b8
3 changed files with 32 additions and 11 deletions
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src/backend/utils/activity/wait_event_names.txt
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@@ -331,6 +331,7 @@ WaitEventExtension "Waiting to read or update custom wait events information for
WALSummarizer "Waiting to read or update WAL summarization state."
DSMRegistry "Waiting to read or update the dynamic shared memory registry."
InjectionPoint "Waiting to read or update information related to injection points."
SerialControl "Waiting to read or update shared <filename>pg_serial</filename> state."
#
# END OF PREDEFINED LWLOCKS (DO NOT CHANGE THIS LINE)