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Add some instrumentation to the bgwriter, through the stats collector.

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New view pg_stat_bgwriter, and the functions required to build it.
This commit is contained in:
Magnus Hagander
2007-03-30 18:34:56 +00:00
parent f9ce21f94c
commit 335feca441
10 changed files with 349 additions and 12 deletions
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41
src/include/pgstat.h
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@ -5,7 +5,7 @@
*
* Copyright (c) 2001-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.56 2007/03/22 19:53:31 momjian Exp $
* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.57 2007/03/30 18:34:55 mha Exp $
* ----------
*/
#ifndef PGSTAT_H
@ -30,7 +30,8 @@ typedef enum StatMsgType
PGSTAT_MTYPE_RESETCOUNTER,
PGSTAT_MTYPE_AUTOVAC_START,
PGSTAT_MTYPE_VACUUM,
PGSTAT_MTYPE_ANALYZE
PGSTAT_MTYPE_ANALYZE,
PGSTAT_MTYPE_BGWRITER
} StatMsgType;
/* ----------
@ -212,6 +213,24 @@ typedef struct PgStat_MsgAnalyze
} PgStat_MsgAnalyze;
/* ----------
* PgStat_MsgBgWriter Sent by the bgwriter to update statistics.
* ----------
*/
typedef struct PgStat_MsgBgWriter
{
PgStat_MsgHdr m_hdr;
PgStat_Counter m_timed_checkpoints;
PgStat_Counter m_requested_checkpoints;
PgStat_Counter m_buf_written_checkpoints;
PgStat_Counter m_buf_written_lru;
PgStat_Counter m_buf_written_all;
PgStat_Counter m_maxwritten_lru;
PgStat_Counter m_maxwritten_all;
} PgStat_MsgBgWriter;
/* ----------
* PgStat_Msg Union over all possible messages.
* ----------
@ -227,6 +246,7 @@ typedef union PgStat_Msg
PgStat_MsgAutovacStart msg_autovacuum;
PgStat_MsgVacuum msg_vacuum;
PgStat_MsgAnalyze msg_analyze;
PgStat_MsgBgWriter msg_bgwriter;
} PgStat_Msg;
@ -297,6 +317,21 @@ typedef struct PgStat_StatTabEntry
} PgStat_StatTabEntry;
/*
* Global statistics kept in the stats collector
*/
typedef struct PgStat_GlobalStats
{
PgStat_Counter timed_checkpoints;
PgStat_Counter requested_checkpoints;
PgStat_Counter buf_written_checkpoints;
PgStat_Counter buf_written_lru;
PgStat_Counter buf_written_all;
PgStat_Counter maxwritten_lru;
PgStat_Counter maxwritten_all;
} PgStat_GlobalStats;
/* ----------
* Shared-memory data structures
* ----------
@ -478,6 +513,7 @@ extern void pgstat_initstats(PgStat_Info *stats, Relation rel);
extern void pgstat_count_xact_commit(void);
extern void pgstat_count_xact_rollback(void);
extern void pgstat_send_bgwriter(void);
/* ----------
* Support functions for the SQL-callable functions to
@ -488,5 +524,6 @@ extern PgStat_StatDBEntry *pgstat_fetch_stat_dbentry(Oid dbid);
extern PgStat_StatTabEntry *pgstat_fetch_stat_tabentry(Oid relid);
extern PgBackendStatus *pgstat_fetch_stat_beentry(int beid);
extern int pgstat_fetch_stat_numbackends(void);
extern PgStat_GlobalStats *pgstat_fetch_global(void);
#endif /* PGSTAT_H */