Andres Freund 92daeca45d Add wait event for pg_usleep() in perform_spin_delay() ... The lwlock wait queue scalability issue fixed in a4adc31f69 was quite hard to find because of the exponential backoff and because we adjust spins_per_delay over time within a backend. To make it easier to find similar issues in the future, add a wait event for the pg_usleep() in perform_spin_delay(). Showing a wait event while spinning without sleeping would increase the overhead of spinlocks, which we do not want. We may at some later point want to have more granular wait events, but that'd be a substantial amount of work. This provides at least some insights into something currently hard to observe. Reviewed-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com> https://postgr.es/m/20221120204310.xywrhyxyytsajuuq@awork3.anarazel.de		2022-11-21 20:34:17 -08:00
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src	Add wait event for pg_usleep() in perform_spin_delay()	2022-11-21 20:34:17 -08:00
KNOWN_BUGS	Remove extra newlines at end and beginning of files, add missing newlines	2010-08-19 05:57:36 +00:00
Makefile	Remove maintainer-check target, fold into normal build	2013-10-10 20:11:56 -04:00
MISSING_FEATURES	Remove extra newlines at end and beginning of files, add missing newlines	2010-08-19 05:57:36 +00:00
TODO	Change documentation references to PG website to use https: not http:	2017-05-20 21:50:47 -04:00