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Add target "slru" to pg_stat_reset_shared()

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Currently, pg_stat_reset_shared() cannot reset the counters in the view
pg_stat_slru even if it is a type of shared stats.  This patch adds
support for a new value in pg_stat_reset_shared(), called "slru", able
to do that.  Note that pg_stat_reset_shared(NULL) also resets SLRU
counters.

There may be a point in removing pg_stat_reset_slru() that was
introduced in 28cac71bd3 (v13~) as the new option overlaps with this
function, but we would lose the ability to reset individual SLRU
counters.  This is left for future reconsideration.

Author: Atsushi Torikoshi
Discussion: https://postgr.es/m/e3c25d72e81378e7b64f3c52e0306fc9@oss.nttdata.com
This commit is contained in:
Michael Paquier
2023-11-16 15:41:34 +09:00
parent 816f10564a
commit 2e8a0edc2a
4 changed files with 39 additions and 2 deletions
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5
src/backend/utils/adt/pgstatfuncs.c
View File

@ -1695,6 +1695,7 @@ pg_stat_reset_shared(PG_FUNCTION_ARGS)
pgstat_reset_of_kind(PGSTAT_KIND_CHECKPOINTER);
pgstat_reset_of_kind(PGSTAT_KIND_IO);
XLogPrefetchResetStats();
pgstat_reset_of_kind(PGSTAT_KIND_SLRU);
pgstat_reset_of_kind(PGSTAT_KIND_WAL);
PG_RETURN_VOID();
@ -1712,13 +1713,15 @@ pg_stat_reset_shared(PG_FUNCTION_ARGS)
pgstat_reset_of_kind(PGSTAT_KIND_IO);
else if (strcmp(target, "recovery_prefetch") == 0)
XLogPrefetchResetStats();
else if (strcmp(target, "slru") == 0)
pgstat_reset_of_kind(PGSTAT_KIND_SLRU);
else if (strcmp(target, "wal") == 0)
pgstat_reset_of_kind(PGSTAT_KIND_WAL);
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("unrecognized reset target: \"%s\"", target),
errhint("Target must be \"archiver\", \"bgwriter\", \"checkpointer\", \"io\", \"recovery_prefetch\", or \"wal\".")));
errhint("Target must be \"archiver\", \"bgwriter\", \"checkpointer\", \"io\", \"recovery_prefetch\", \"slru\", or \"wal\".")));
PG_RETURN_VOID();
}