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Add pg_stat_reset_shared('bgwriter') to reset the cluster-wide shared

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statistics of the bgwriter.

Greg Smith
This commit is contained in:
Magnus Hagander
2010-01-19 14:11:32 +00:00
parent 4f15699d70
commit 7e40cdc075
6 changed files with 111 additions and 7 deletions
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62
src/backend/postmaster/pgstat.c
View File

@@ -13,7 +13,7 @@
*
* Copyright (c) 2001-2010, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.197 2010/01/10 14:16:07 mha Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.198 2010/01/19 14:11:30 mha Exp $
* ----------
*/
#include "postgres.h"
@@ -270,6 +270,7 @@ static void pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len);
static void pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len);
static void pgstat_recv_dropdb(PgStat_MsgDropdb *msg, int len);
static void pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len);
static void pgstat_recv_resetsharedcounter(PgStat_MsgResetsharedcounter *msg, int len);
static void pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len);
static void pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len);
static void pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len);
@@ -1153,6 +1154,38 @@ pgstat_reset_counters(void)
pgstat_send(&msg, sizeof(msg));
}
/* ----------
* pgstat_reset_shared_counters() -
*
* Tell the statistics collector to reset cluster-wide shared counters.
* ----------
*/
void
pgstat_reset_shared_counters(const char *target)
{
PgStat_MsgResetsharedcounter msg;
if (pgStatSock < 0)
return;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to reset statistics counters")));
if (strcmp(target, "bgwriter") == 0)
msg.m_resettarget = RESET_BGWRITER;
else
{
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("unrecognized reset target: '%s'", target),
errhint("allowed targets are 'bgwriter'.")));
}
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETSHAREDCOUNTER);
pgstat_send(&msg, sizeof(msg));
}
/* ----------
* pgstat_report_autovac() -
@@ -2915,6 +2948,12 @@ PgstatCollectorMain(int argc, char *argv[])
len);
break;
case PGSTAT_MTYPE_RESETSHAREDCOUNTER:
pgstat_recv_resetsharedcounter(
(PgStat_MsgResetsharedcounter *) &msg,
len);
break;
case PGSTAT_MTYPE_AUTOVAC_START:
pgstat_recv_autovac((PgStat_MsgAutovacStart *) &msg, len);
break;
@@ -3868,6 +3907,27 @@ pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len)
HASH_ELEM | HASH_FUNCTION);
}
/* ----------
* pgstat_recv_resetshared() -
*
* Reset some shared statistics of the cluster.
* ----------
*/
static void
pgstat_recv_resetsharedcounter(PgStat_MsgResetsharedcounter *msg, int len)
{
if (msg->m_resettarget==RESET_BGWRITER)
{
/* Reset the global background writer statistics for the cluster. */
memset(&globalStats, 0, sizeof(globalStats));
}
/*
* Presumably the sender of this message validated the target, don't
* complain here if it's not valid
*/
}
/* ----------
* pgstat_recv_autovac() -
*

14
src/backend/utils/adt/pgstatfuncs.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/pgstatfuncs.c,v 1.57 2010/01/02 16:57:54 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/pgstatfuncs.c,v 1.58 2010/01/19 14:11:31 mha Exp $
*
*-------------------------------------------------------------------------
*/
@@ -78,6 +78,7 @@ extern Datum pg_stat_get_buf_alloc(PG_FUNCTION_ARGS);
extern Datum pg_stat_clear_snapshot(PG_FUNCTION_ARGS);
extern Datum pg_stat_reset(PG_FUNCTION_ARGS);
extern Datum pg_stat_reset_shared(PG_FUNCTION_ARGS);
/* Global bgwriter statistics, from bgwriter.c */
extern PgStat_MsgBgWriter bgwriterStats;
@@ -1108,3 +1109,14 @@ pg_stat_reset(PG_FUNCTION_ARGS)
PG_RETURN_VOID();
}
/* Reset some shared cluster-wide counters */
Datum
pg_stat_reset_shared(PG_FUNCTION_ARGS)
{
char *target = text_to_cstring(PG_GETARG_TEXT_PP(0));
pgstat_reset_shared_counters(target);
PG_RETURN_VOID();
}