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Michael Paquier 9aea73fc61 Add backend-level statistics to pgstats ... This adds a new variable-numbered statistics kind in pgstats, where the object ID key of the stats entries is based on the proc number of the backends. This acts as an upper-bound for the number of stats entries that can exist at once. The entries are created when a backend starts after authentication succeeds, and are removed when the backend exits, making the stats entry exist for as long as their backend is up and running. These are not written to the pgstats file at shutdown (note that write_to_file is disabled, as a safety measure). Currently, these stats include only information about the I/O generated by a backend, using the same layer as pg_stat_io, except that it is now possible to know how much activity is happening in each backend rather than an overall aggregate of all the activity. A function called pg_stat_get_backend_io() is added to access this data depending on the PID of a backend. The existing structure could be expanded in the future to add more information about other statistics related to backends, depending on requirements or ideas. Auxiliary processes are not included in this set of statistics. These are less interesting to have than normal backends as they have dedicated entries in pg_stat_io, and stats kinds of their own. This commit includes also pg_stat_reset_backend_stats(), function able to reset all the stats associated to a single backend. Bump catalog version and PGSTAT_FILE_FORMAT_ID. Author: Bertrand Drouvot Reviewed-by: Álvaro Herrera, Kyotaro Horiguchi, Michael Paquier, Nazir Bilal Yavuz Discussion: https://postgr.es/m/ZtXR+CtkEVVE/LHF@ip-10-97-1-34.eu-west-3.compute.internal		1 year ago
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.gitignore	Add system view pg_wait_events	2 years ago
Makefile	Add backend-level statistics to pgstats	1 year ago
backend_progress.c	Remove unused #include's from backend .c files	1 year ago
backend_status.c	Add backend-level statistics to pgstats	1 year ago
generate-wait_event_types.pl	Cleanup perl code from unused variables and routines	2 years ago
meson.build	Add backend-level statistics to pgstats	1 year ago
pgstat.c	Add backend-level statistics to pgstats	1 year ago
pgstat_archiver.c	Add PgStat_KindInfo.init_shmem_cb	1 year ago
pgstat_backend.c	Add backend-level statistics to pgstats	1 year ago
pgstat_bgwriter.c	Add pg_memory_is_all_zeros() in memutils.h	1 year ago
pgstat_checkpointer.c	Add pg_memory_is_all_zeros() in memutils.h	1 year ago
pgstat_database.c	Add two attributes to pg_stat_database for parallel workers activity	1 year ago
pgstat_function.c	Update copyright for 2024	2 years ago
pgstat_io.c	Add backend-level statistics to pgstats	1 year ago
pgstat_relation.c	Add backend-level statistics to pgstats	1 year ago
pgstat_replslot.c	Extend PgStat_HashKey.objid from 4 to 8 bytes	1 year ago
pgstat_shmem.c	Fix invalidation of local pgstats references for entry reinitialization	1 year ago
pgstat_slru.c	Add callbacks to control flush of fixed-numbered stats	1 year ago
pgstat_subscription.c	Collect statistics about conflicts in logical replication.	1 year ago
pgstat_wal.c	Add callbacks to control flush of fixed-numbered stats	1 year ago
pgstat_xact.c	Extend PgStat_HashKey.objid from 4 to 8 bytes	1 year ago
wait_event.c	Remove unused #include's from backend .c files	1 year ago
wait_event_funcs.c	Add wait event type "InjectionPoint", a custom type like "Extension".	2 years ago
wait_event_names.txt	Revert pg_wal_replay_wait() stored procedure	1 year ago