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Refactor some code related to backend statistics

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This commit changes the way pending backend statistics are tracked by
moving them into a new structure called PgStat_BackendPending, removing
PgStat_BackendPendingIO.  PgStat_BackendPending currently only includes
PgStat_PendingIO for the pending I/O stats.

pgstat_flush_backend() is extended with a "flags" argument to control
which parts of the stats of a backend should be flushed.

With this refactoring, it becomes easier to plug into backend statistics
more data.  A patch to add information related to WAL in this stats kind
is under discussion.

Author: Bertrand Drouvot
Discussion: https://postgr.es/m/Z3zqc4o09dM/Ezyz@ip-10-97-1-34.eu-west-3.compute.internal
This commit is contained in:
Michael Paquier
2025-01-10 09:00:48 +09:00
parent 39e3bcae44
commit 2c14037bb5
8 changed files with 76 additions and 35 deletions
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2
src/backend/utils/adt/pgstatfuncs.c
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@ -1544,7 +1544,7 @@ pg_stat_get_backend_io(PG_FUNCTION_ARGS)
if (bktype == B_INVALID)
return (Datum) 0;
bktype_stats = &backend_stats->stats;
bktype_stats = &backend_stats->io_stats;
/*
* In Assert builds, we can afford an extra loop through all of the