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Add stats_reset to pg_stat_user_functions

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It is possible to call pg_stat_reset_single_function_counters() for a
single function, but the reset time was missing the system view showing
its statistics.  Like all the fields of pg_stat_user_functions, the GUC
track_functions needs to be enabled to show the statistics about
function executions.

Bump catalog version.
Bump PGSTAT_FILE_FORMAT_ID, as a result of the new field added to
PgStat_StatFuncEntry.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/aONjnsaJSx-nEdfU@paquier.xyz
This commit is contained in:
Michael Paquier
2025-10-08 12:43:40 +09:00
parent 035b09131d
commit b71bae41a0
13 changed files with 90 additions and 8 deletions
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3
src/backend/catalog/system_views.sql
View File

@@ -1131,7 +1131,8 @@ CREATE VIEW pg_stat_user_functions AS
P.proname AS funcname,
pg_stat_get_function_calls(P.oid) AS calls,
pg_stat_get_function_total_time(P.oid) AS total_time,
pg_stat_get_function_self_time(P.oid) AS self_time
pg_stat_get_function_self_time(P.oid) AS self_time,
pg_stat_get_function_stat_reset_time(P.oid) AS stats_reset
FROM pg_proc P LEFT JOIN pg_namespace N ON (N.oid = P.pronamespace)
WHERE P.prolang != 12 -- fast check to eliminate built-in functions
AND pg_stat_get_function_calls(P.oid) IS NOT NULL;

1
src/backend/utils/activity/pgstat.c
View File

@@ -328,6 +328,7 @@ static const PgStat_KindInfo pgstat_kind_builtin_infos[PGSTAT_KIND_BUILTIN_SIZE]
.pending_size = sizeof(PgStat_FunctionCounts),
.flush_pending_cb = pgstat_function_flush_cb,
.reset_timestamp_cb = pgstat_function_reset_timestamp_cb,
},
[PGSTAT_KIND_REPLSLOT] = {

6
src/backend/utils/activity/pgstat_function.c
View File

@@ -214,6 +214,12 @@ pgstat_function_flush_cb(PgStat_EntryRef *entry_ref, bool nowait)
return true;
}
void
pgstat_function_reset_timestamp_cb(PgStatShared_Common *header, TimestampTz ts)
{
((PgStatShared_Function *) header)->stats.stat_reset_timestamp = ts;
}
/*
* find any existing PgStat_FunctionCounts entry for specified function
*

18
src/backend/utils/adt/pgstatfuncs.c
View File

@@ -203,6 +203,24 @@ PG_STAT_GET_FUNCENTRY_FLOAT8_MS(total_time)
/* pg_stat_get_function_self_time */
PG_STAT_GET_FUNCENTRY_FLOAT8_MS(self_time)
Datum
pg_stat_get_function_stat_reset_time(PG_FUNCTION_ARGS)
{
Oid funcid = PG_GETARG_OID(0);
TimestampTz result;
PgStat_StatFuncEntry *funcentry;
if ((funcentry = pgstat_fetch_stat_funcentry(funcid)) == NULL)
result = 0;
else
result = funcentry->stat_reset_timestamp;
if (result == 0)
PG_RETURN_NULL();
else
PG_RETURN_TIMESTAMPTZ(result);
}
Datum
pg_stat_get_backend_idset(PG_FUNCTION_ARGS)
{