You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

Michael Paquier 5d4298e75f pg_stat_statements: Avoid some locking during PGSS entry scans ... A single PGSS entry's spinlock is used to be able to modify "counters" without holding pgss->lock exclusively, as mentioned at the top of pg_stat_statements.c and within pgssEntry. Within a single pgssEntry, stats_since and minmax_stats_since are never modified without holding pgss->lock exclusively, so there is no need to hold an entry's spinlock when reading stats_since and minmax_stats_since, as done when scanning all the PGSS entries for function calls of pg_stat_statements(). This also restores the consistency between the code and the comments about the entry's spinlock usage. This change is a performance improvement (it can be argued that this is a logic bug), so there is no need for a backpatch. This saves two instructions from being read while holding an entry's spinlock. Author: Karina Litskevich Reviewed-by: Michael Paquier, wenhui qiu Discussion: https://postgr.es/m/CACiT8ibhCmzbcOxM0v4pRLH3abk-95LPkt7_uC2JMP+miPjxsg@mail.gmail.com		10 months ago
..
expected	Set query ID for inner queries of CREATE TABLE AS and DECLARE	11 months ago
sql	Track more precisely query locations for nested statements	11 months ago
t	Update copyright for 2024	2 years ago
.gitignore	…
Makefile	pg_stat_statements: Add columns to track parallel worker activity	11 months ago
meson.build	pg_stat_statements: Add columns to track parallel worker activity	11 months ago
pg_stat_statements--1.0--1.1.sql	…
pg_stat_statements--1.1--1.2.sql	…
pg_stat_statements--1.2--1.3.sql	…
pg_stat_statements--1.3--1.4.sql	…
pg_stat_statements--1.4--1.5.sql	…
pg_stat_statements--1.4.sql	…
pg_stat_statements--1.5--1.6.sql	Revoke pg_stat_statements_reset() permissions	7 years ago
pg_stat_statements--1.6--1.7.sql	Extend pg_stat_statements_reset to reset statistics specific to a	7 years ago
pg_stat_statements--1.7--1.8.sql	Change the display of WAL usage statistics in Explain.	5 years ago
pg_stat_statements--1.8--1.9.sql	Merge v1.10 of pg_stat_statements into v1.9	4 years ago
pg_stat_statements--1.9--1.10.sql	Add JIT counters to pg_stat_statements	3 years ago
pg_stat_statements--1.10--1.11.sql	Track statement entry timestamp in contrib/pg_stat_statements	2 years ago
pg_stat_statements--1.11--1.12.sql	pg_stat_statements: Add columns to track parallel worker activity	11 months ago
pg_stat_statements.c	pg_stat_statements: Avoid some locking during PGSS entry scans	10 months ago
pg_stat_statements.conf	Revert "pg_stat_statements: Add coverage for entry_dealloc()"	2 years ago
pg_stat_statements.control	pg_stat_statements: Add columns to track parallel worker activity	11 months ago