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Andres Freund 202b12774d bufmgr: Improve stats when a buffer is read in concurrently ... Previously we would have the following inaccuracies when a backend tried to read in a buffer, but that buffer was read in concurrently by another backend: - the read IO was double-counted in the global buffer access stats (pgBufferUsage) - the buffer hit was not accounted for in: - global buffer access statistics - pg_stat_io - relation level IO stats - vacuum cost balancing While trying to read in a buffer that is concurrently read in by another backend is not a common occurrence, it's also not that rare, e.g. due to concurrent sequential scans on the same relation. This scenario has become more likely in PG 17, due to the introducing of read streams, which can pin multiple buffers before calling StartBufferIO() for all the buffers. This behaviour has historically grown, but there doesn't seem to be any reason to continue with the wrong accounting. Reviewed-by: Melanie Plageman <melanieplageman@gmail.com> Discussion: https://postgr.es/m/CAAKRu_Zk-B08AzPsO-6680LUHLOCGaNJYofaxTFseLa=OepV1g@mail.gmail.com		1 year ago
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backend	bufmgr: Improve stats when a buffer is read in concurrently	1 year ago
bin	Add test for pg_upgrade file transfer modes.	1 year ago
common	Revert workarounds for -Wmissing-braces false positives on old GCC	1 year ago
fe_utils	pg_rewind: Add dbname to primary_conninfo when using --write-recovery-conf.	1 year ago
include	Add an additional hook for EXPLAIN option validation.	1 year ago
interfaces	Revert workarounds for -Wmissing-braces false positives on old GCC	1 year ago
makefiles	Add support for OAUTHBEARER SASL mechanism	1 year ago
pl	Activate Python "Limited API" in PL/Python	1 year ago
port	Assert that wrapper_handler()'s argument is within expected range.	1 year ago
template	…
test	Add test for pg_upgrade file transfer modes.	1 year ago
timezone	pg_noreturn to replace pg_attribute_noreturn()	1 year ago
tools	meson: Flush stdout in testwrap	1 year ago
tutorial	Doc: simplify the tutorial's window-function examples.	1 year ago
.gitignore	…
DEVELOPERS	…
Makefile	…
Makefile.global.in	extension_control_path	1 year ago
Makefile.shlib	…
meson.build	Update copyright for 2025	1 year ago
nls-global.mk	…