3970 lines
101 KiB
C
3970 lines
101 KiB
C
/* ----------
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* pgstat.c
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*
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* All the statistics collector stuff hacked up in one big, ugly file.
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*
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* TODO: - Separate collector, postmaster and backend stuff
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* into different files.
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*
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* - Add some automatic call for pgstat vacuuming.
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*
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* - Add a pgstat config column to pg_database, so this
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* entire thing can be enabled/disabled on a per db basis.
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*
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* Copyright (c) 2001-2009, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.192 2009/10/02 22:49:50 tgl Exp $
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* ----------
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*/
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#include "postgres.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <signal.h>
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#include <time.h>
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#ifdef HAVE_POLL_H
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#include <poll.h>
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#endif
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#ifdef HAVE_SYS_POLL_H
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#include <sys/poll.h>
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#endif
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#include "pgstat.h"
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#include "access/heapam.h"
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#include "access/transam.h"
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#include "access/twophase_rmgr.h"
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#include "access/xact.h"
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#include "catalog/pg_database.h"
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#include "catalog/pg_proc.h"
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#include "libpq/ip.h"
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#include "libpq/libpq.h"
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#include "libpq/pqsignal.h"
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#include "mb/pg_wchar.h"
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#include "miscadmin.h"
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#include "pg_trace.h"
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#include "postmaster/autovacuum.h"
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#include "postmaster/fork_process.h"
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#include "postmaster/postmaster.h"
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#include "storage/backendid.h"
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#include "storage/fd.h"
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#include "storage/ipc.h"
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#include "storage/pg_shmem.h"
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#include "storage/pmsignal.h"
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#include "utils/guc.h"
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#include "utils/memutils.h"
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#include "utils/ps_status.h"
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#include "utils/rel.h"
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#include "utils/tqual.h"
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/* ----------
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* Paths for the statistics files (relative to installation's $PGDATA).
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* ----------
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*/
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#define PGSTAT_STAT_PERMANENT_FILENAME "global/pgstat.stat"
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#define PGSTAT_STAT_PERMANENT_TMPFILE "global/pgstat.tmp"
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/* ----------
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* Timer definitions.
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* ----------
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*/
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#define PGSTAT_STAT_INTERVAL 500 /* Minimum time between stats file
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* updates; in milliseconds. */
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#define PGSTAT_RETRY_DELAY 10 /* How long to wait between statistics
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* update requests; in milliseconds. */
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#define PGSTAT_MAX_WAIT_TIME 5000 /* Maximum time to wait for a stats
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* file update; in milliseconds. */
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#define PGSTAT_RESTART_INTERVAL 60 /* How often to attempt to restart a
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* failed statistics collector; in
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* seconds. */
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#define PGSTAT_SELECT_TIMEOUT 2 /* How often to check for postmaster
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* death; in seconds. */
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#define PGSTAT_POLL_LOOP_COUNT (PGSTAT_MAX_WAIT_TIME / PGSTAT_RETRY_DELAY)
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/* ----------
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* The initial size hints for the hash tables used in the collector.
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* ----------
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*/
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#define PGSTAT_DB_HASH_SIZE 16
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#define PGSTAT_TAB_HASH_SIZE 512
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#define PGSTAT_FUNCTION_HASH_SIZE 512
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/* ----------
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* GUC parameters
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* ----------
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*/
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bool pgstat_track_activities = false;
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bool pgstat_track_counts = false;
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int pgstat_track_functions = TRACK_FUNC_OFF;
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int pgstat_track_activity_query_size = 1024;
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/* ----------
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* Built from GUC parameter
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* ----------
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*/
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char *pgstat_stat_filename = NULL;
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char *pgstat_stat_tmpname = NULL;
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/*
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* BgWriter global statistics counters (unused in other processes).
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* Stored directly in a stats message structure so it can be sent
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* without needing to copy things around. We assume this inits to zeroes.
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*/
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PgStat_MsgBgWriter BgWriterStats;
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/* ----------
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* Local data
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* ----------
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*/
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NON_EXEC_STATIC int pgStatSock = -1;
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static struct sockaddr_storage pgStatAddr;
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static time_t last_pgstat_start_time;
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static bool pgStatRunningInCollector = false;
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/*
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* Structures in which backends store per-table info that's waiting to be
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* sent to the collector.
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*
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* NOTE: once allocated, TabStatusArray structures are never moved or deleted
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* for the life of the backend. Also, we zero out the t_id fields of the
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* contained PgStat_TableStatus structs whenever they are not actively in use.
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* This allows relcache pgstat_info pointers to be treated as long-lived data,
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* avoiding repeated searches in pgstat_initstats() when a relation is
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* repeatedly opened during a transaction.
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*/
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#define TABSTAT_QUANTUM 100 /* we alloc this many at a time */
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typedef struct TabStatusArray
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{
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struct TabStatusArray *tsa_next; /* link to next array, if any */
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int tsa_used; /* # entries currently used */
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PgStat_TableStatus tsa_entries[TABSTAT_QUANTUM]; /* per-table data */
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} TabStatusArray;
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static TabStatusArray *pgStatTabList = NULL;
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/*
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* Backends store per-function info that's waiting to be sent to the collector
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* in this hash table (indexed by function OID).
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*/
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static HTAB *pgStatFunctions = NULL;
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/*
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* Indicates if backend has some function stats that it hasn't yet
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* sent to the collector.
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*/
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static bool have_function_stats = false;
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/*
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* Tuple insertion/deletion counts for an open transaction can't be propagated
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* into PgStat_TableStatus counters until we know if it is going to commit
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* or abort. Hence, we keep these counts in per-subxact structs that live
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* in TopTransactionContext. This data structure is designed on the assumption
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* that subxacts won't usually modify very many tables.
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*/
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typedef struct PgStat_SubXactStatus
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{
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int nest_level; /* subtransaction nest level */
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struct PgStat_SubXactStatus *prev; /* higher-level subxact if any */
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PgStat_TableXactStatus *first; /* head of list for this subxact */
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} PgStat_SubXactStatus;
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static PgStat_SubXactStatus *pgStatXactStack = NULL;
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static int pgStatXactCommit = 0;
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static int pgStatXactRollback = 0;
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/* Record that's written to 2PC state file when pgstat state is persisted */
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typedef struct TwoPhasePgStatRecord
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{
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PgStat_Counter tuples_inserted; /* tuples inserted in xact */
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PgStat_Counter tuples_deleted; /* tuples deleted in xact */
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Oid t_id; /* table's OID */
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bool t_shared; /* is it a shared catalog? */
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} TwoPhasePgStatRecord;
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/*
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* Info about current "snapshot" of stats file
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*/
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static MemoryContext pgStatLocalContext = NULL;
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static HTAB *pgStatDBHash = NULL;
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static PgBackendStatus *localBackendStatusTable = NULL;
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static int localNumBackends = 0;
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/*
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* Cluster wide statistics, kept in the stats collector.
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* Contains statistics that are not collected per database
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* or per table.
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*/
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static PgStat_GlobalStats globalStats;
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/* Last time the collector successfully wrote the stats file */
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static TimestampTz last_statwrite;
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/* Latest statistics request time from backends */
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static TimestampTz last_statrequest;
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static volatile bool need_exit = false;
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static volatile bool got_SIGHUP = false;
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/*
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* Total time charged to functions so far in the current backend.
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* We use this to help separate "self" and "other" time charges.
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* (We assume this initializes to zero.)
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*/
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static instr_time total_func_time;
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/* ----------
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* Local function forward declarations
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* ----------
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*/
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#ifdef EXEC_BACKEND
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static pid_t pgstat_forkexec(void);
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#endif
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NON_EXEC_STATIC void PgstatCollectorMain(int argc, char *argv[]);
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static void pgstat_exit(SIGNAL_ARGS);
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static void pgstat_beshutdown_hook(int code, Datum arg);
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static void pgstat_sighup_handler(SIGNAL_ARGS);
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static PgStat_StatDBEntry *pgstat_get_db_entry(Oid databaseid, bool create);
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static PgStat_StatTabEntry *pgstat_get_tab_entry(PgStat_StatDBEntry *dbentry,
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Oid tableoid, bool create);
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static void pgstat_write_statsfile(bool permanent);
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static HTAB *pgstat_read_statsfile(Oid onlydb, bool permanent);
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static void backend_read_statsfile(void);
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static void pgstat_read_current_status(void);
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static void pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg);
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static void pgstat_send_funcstats(void);
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static HTAB *pgstat_collect_oids(Oid catalogid);
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static PgStat_TableStatus *get_tabstat_entry(Oid rel_id, bool isshared);
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static void pgstat_setup_memcxt(void);
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static void pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype);
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static void pgstat_send(void *msg, int len);
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static void pgstat_recv_inquiry(PgStat_MsgInquiry *msg, int len);
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static void pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len);
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static void pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len);
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static void pgstat_recv_dropdb(PgStat_MsgDropdb *msg, int len);
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static void pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len);
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static void pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len);
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static void pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len);
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static void pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len);
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static void pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len);
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static void pgstat_recv_funcstat(PgStat_MsgFuncstat *msg, int len);
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static void pgstat_recv_funcpurge(PgStat_MsgFuncpurge *msg, int len);
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/* ------------------------------------------------------------
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* Public functions called from postmaster follow
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* ------------------------------------------------------------
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*/
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/* ----------
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* pgstat_init() -
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*
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* Called from postmaster at startup. Create the resources required
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* by the statistics collector process. If unable to do so, do not
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* fail --- better to let the postmaster start with stats collection
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* disabled.
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* ----------
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*/
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void
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pgstat_init(void)
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{
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ACCEPT_TYPE_ARG3 alen;
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struct addrinfo *addrs = NULL,
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*addr,
|
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hints;
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int ret;
|
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fd_set rset;
|
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struct timeval tv;
|
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char test_byte;
|
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int sel_res;
|
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int tries = 0;
|
|
|
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#define TESTBYTEVAL ((char) 199)
|
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|
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/*
|
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* Create the UDP socket for sending and receiving statistic messages
|
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*/
|
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hints.ai_flags = AI_PASSIVE;
|
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hints.ai_family = PF_UNSPEC;
|
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hints.ai_socktype = SOCK_DGRAM;
|
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hints.ai_protocol = 0;
|
|
hints.ai_addrlen = 0;
|
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hints.ai_addr = NULL;
|
|
hints.ai_canonname = NULL;
|
|
hints.ai_next = NULL;
|
|
ret = pg_getaddrinfo_all("localhost", NULL, &hints, &addrs);
|
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if (ret || !addrs)
|
|
{
|
|
ereport(LOG,
|
|
(errmsg("could not resolve \"localhost\": %s",
|
|
gai_strerror(ret))));
|
|
goto startup_failed;
|
|
}
|
|
|
|
/*
|
|
* On some platforms, pg_getaddrinfo_all() may return multiple addresses
|
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* only one of which will actually work (eg, both IPv6 and IPv4 addresses
|
|
* when kernel will reject IPv6). Worse, the failure may occur at the
|
|
* bind() or perhaps even connect() stage. So we must loop through the
|
|
* results till we find a working combination. We will generate LOG
|
|
* messages, but no error, for bogus combinations.
|
|
*/
|
|
for (addr = addrs; addr; addr = addr->ai_next)
|
|
{
|
|
#ifdef HAVE_UNIX_SOCKETS
|
|
/* Ignore AF_UNIX sockets, if any are returned. */
|
|
if (addr->ai_family == AF_UNIX)
|
|
continue;
|
|
#endif
|
|
|
|
if (++tries > 1)
|
|
ereport(LOG,
|
|
(errmsg("trying another address for the statistics collector")));
|
|
|
|
/*
|
|
* Create the socket.
|
|
*/
|
|
if ((pgStatSock = socket(addr->ai_family, SOCK_DGRAM, 0)) < 0)
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_socket_access(),
|
|
errmsg("could not create socket for statistics collector: %m")));
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Bind it to a kernel assigned port on localhost and get the assigned
|
|
* port via getsockname().
|
|
*/
|
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if (bind(pgStatSock, addr->ai_addr, addr->ai_addrlen) < 0)
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_socket_access(),
|
|
errmsg("could not bind socket for statistics collector: %m")));
|
|
closesocket(pgStatSock);
|
|
pgStatSock = -1;
|
|
continue;
|
|
}
|
|
|
|
alen = sizeof(pgStatAddr);
|
|
if (getsockname(pgStatSock, (struct sockaddr *) & pgStatAddr, &alen) < 0)
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_socket_access(),
|
|
errmsg("could not get address of socket for statistics collector: %m")));
|
|
closesocket(pgStatSock);
|
|
pgStatSock = -1;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Connect the socket to its own address. This saves a few cycles by
|
|
* not having to respecify the target address on every send. This also
|
|
* provides a kernel-level check that only packets from this same
|
|
* address will be received.
|
|
*/
|
|
if (connect(pgStatSock, (struct sockaddr *) & pgStatAddr, alen) < 0)
|
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{
|
|
ereport(LOG,
|
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(errcode_for_socket_access(),
|
|
errmsg("could not connect socket for statistics collector: %m")));
|
|
closesocket(pgStatSock);
|
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pgStatSock = -1;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Try to send and receive a one-byte test message on the socket. This
|
|
* is to catch situations where the socket can be created but will not
|
|
* actually pass data (for instance, because kernel packet filtering
|
|
* rules prevent it).
|
|
*/
|
|
test_byte = TESTBYTEVAL;
|
|
|
|
retry1:
|
|
if (send(pgStatSock, &test_byte, 1, 0) != 1)
|
|
{
|
|
if (errno == EINTR)
|
|
goto retry1; /* if interrupted, just retry */
|
|
ereport(LOG,
|
|
(errcode_for_socket_access(),
|
|
errmsg("could not send test message on socket for statistics collector: %m")));
|
|
closesocket(pgStatSock);
|
|
pgStatSock = -1;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* There could possibly be a little delay before the message can be
|
|
* received. We arbitrarily allow up to half a second before deciding
|
|
* it's broken.
|
|
*/
|
|
for (;;) /* need a loop to handle EINTR */
|
|
{
|
|
FD_ZERO(&rset);
|
|
FD_SET (pgStatSock, &rset);
|
|
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 500000;
|
|
sel_res = select(pgStatSock + 1, &rset, NULL, NULL, &tv);
|
|
if (sel_res >= 0 || errno != EINTR)
|
|
break;
|
|
}
|
|
if (sel_res < 0)
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_socket_access(),
|
|
errmsg("select() failed in statistics collector: %m")));
|
|
closesocket(pgStatSock);
|
|
pgStatSock = -1;
|
|
continue;
|
|
}
|
|
if (sel_res == 0 || !FD_ISSET(pgStatSock, &rset))
|
|
{
|
|
/*
|
|
* This is the case we actually think is likely, so take pains to
|
|
* give a specific message for it.
|
|
*
|
|
* errno will not be set meaningfully here, so don't use it.
|
|
*/
|
|
ereport(LOG,
|
|
(errcode(ERRCODE_CONNECTION_FAILURE),
|
|
errmsg("test message did not get through on socket for statistics collector")));
|
|
closesocket(pgStatSock);
|
|
pgStatSock = -1;
|
|
continue;
|
|
}
|
|
|
|
test_byte++; /* just make sure variable is changed */
|
|
|
|
retry2:
|
|
if (recv(pgStatSock, &test_byte, 1, 0) != 1)
|
|
{
|
|
if (errno == EINTR)
|
|
goto retry2; /* if interrupted, just retry */
|
|
ereport(LOG,
|
|
(errcode_for_socket_access(),
|
|
errmsg("could not receive test message on socket for statistics collector: %m")));
|
|
closesocket(pgStatSock);
|
|
pgStatSock = -1;
|
|
continue;
|
|
}
|
|
|
|
if (test_byte != TESTBYTEVAL) /* strictly paranoia ... */
|
|
{
|
|
ereport(LOG,
|
|
(errcode(ERRCODE_INTERNAL_ERROR),
|
|
errmsg("incorrect test message transmission on socket for statistics collector")));
|
|
closesocket(pgStatSock);
|
|
pgStatSock = -1;
|
|
continue;
|
|
}
|
|
|
|
/* If we get here, we have a working socket */
|
|
break;
|
|
}
|
|
|
|
/* Did we find a working address? */
|
|
if (!addr || pgStatSock < 0)
|
|
goto startup_failed;
|
|
|
|
/*
|
|
* Set the socket to non-blocking IO. This ensures that if the collector
|
|
* falls behind, statistics messages will be discarded; backends won't
|
|
* block waiting to send messages to the collector.
|
|
*/
|
|
if (!pg_set_noblock(pgStatSock))
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_socket_access(),
|
|
errmsg("could not set statistics collector socket to nonblocking mode: %m")));
|
|
goto startup_failed;
|
|
}
|
|
|
|
pg_freeaddrinfo_all(hints.ai_family, addrs);
|
|
|
|
return;
|
|
|
|
startup_failed:
|
|
ereport(LOG,
|
|
(errmsg("disabling statistics collector for lack of working socket")));
|
|
|
|
if (addrs)
|
|
pg_freeaddrinfo_all(hints.ai_family, addrs);
|
|
|
|
if (pgStatSock >= 0)
|
|
closesocket(pgStatSock);
|
|
pgStatSock = -1;
|
|
|
|
/*
|
|
* Adjust GUC variables to suppress useless activity, and for debugging
|
|
* purposes (seeing track_counts off is a clue that we failed here). We
|
|
* use PGC_S_OVERRIDE because there is no point in trying to turn it back
|
|
* on from postgresql.conf without a restart.
|
|
*/
|
|
SetConfigOption("track_counts", "off", PGC_INTERNAL, PGC_S_OVERRIDE);
|
|
}
|
|
|
|
/*
|
|
* pgstat_reset_all() -
|
|
*
|
|
* Remove the stats file. This is currently used only if WAL
|
|
* recovery is needed after a crash.
|
|
*/
|
|
void
|
|
pgstat_reset_all(void)
|
|
{
|
|
unlink(pgstat_stat_filename);
|
|
unlink(PGSTAT_STAT_PERMANENT_FILENAME);
|
|
}
|
|
|
|
#ifdef EXEC_BACKEND
|
|
|
|
/*
|
|
* pgstat_forkexec() -
|
|
*
|
|
* Format up the arglist for, then fork and exec, statistics collector process
|
|
*/
|
|
static pid_t
|
|
pgstat_forkexec(void)
|
|
{
|
|
char *av[10];
|
|
int ac = 0;
|
|
|
|
av[ac++] = "postgres";
|
|
av[ac++] = "--forkcol";
|
|
av[ac++] = NULL; /* filled in by postmaster_forkexec */
|
|
|
|
av[ac] = NULL;
|
|
Assert(ac < lengthof(av));
|
|
|
|
return postmaster_forkexec(ac, av);
|
|
}
|
|
#endif /* EXEC_BACKEND */
|
|
|
|
|
|
/*
|
|
* pgstat_start() -
|
|
*
|
|
* Called from postmaster at startup or after an existing collector
|
|
* died. Attempt to fire up a fresh statistics collector.
|
|
*
|
|
* Returns PID of child process, or 0 if fail.
|
|
*
|
|
* Note: if fail, we will be called again from the postmaster main loop.
|
|
*/
|
|
int
|
|
pgstat_start(void)
|
|
{
|
|
time_t curtime;
|
|
pid_t pgStatPid;
|
|
|
|
/*
|
|
* Check that the socket is there, else pgstat_init failed and we can do
|
|
* nothing useful.
|
|
*/
|
|
if (pgStatSock < 0)
|
|
return 0;
|
|
|
|
/*
|
|
* Do nothing if too soon since last collector start. This is a safety
|
|
* valve to protect against continuous respawn attempts if the collector
|
|
* is dying immediately at launch. Note that since we will be re-called
|
|
* from the postmaster main loop, we will get another chance later.
|
|
*/
|
|
curtime = time(NULL);
|
|
if ((unsigned int) (curtime - last_pgstat_start_time) <
|
|
(unsigned int) PGSTAT_RESTART_INTERVAL)
|
|
return 0;
|
|
last_pgstat_start_time = curtime;
|
|
|
|
/*
|
|
* Okay, fork off the collector.
|
|
*/
|
|
#ifdef EXEC_BACKEND
|
|
switch ((pgStatPid = pgstat_forkexec()))
|
|
#else
|
|
switch ((pgStatPid = fork_process()))
|
|
#endif
|
|
{
|
|
case -1:
|
|
ereport(LOG,
|
|
(errmsg("could not fork statistics collector: %m")));
|
|
return 0;
|
|
|
|
#ifndef EXEC_BACKEND
|
|
case 0:
|
|
/* in postmaster child ... */
|
|
/* Close the postmaster's sockets */
|
|
ClosePostmasterPorts(false);
|
|
|
|
/* Lose the postmaster's on-exit routines */
|
|
on_exit_reset();
|
|
|
|
/* Drop our connection to postmaster's shared memory, as well */
|
|
PGSharedMemoryDetach();
|
|
|
|
PgstatCollectorMain(0, NULL);
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
return (int) pgStatPid;
|
|
}
|
|
|
|
/* shouldn't get here */
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
allow_immediate_pgstat_restart(void)
|
|
{
|
|
last_pgstat_start_time = 0;
|
|
}
|
|
|
|
/* ------------------------------------------------------------
|
|
* Public functions used by backends follow
|
|
*------------------------------------------------------------
|
|
*/
|
|
|
|
|
|
/* ----------
|
|
* pgstat_report_stat() -
|
|
*
|
|
* Called from tcop/postgres.c to send the so far collected per-table
|
|
* and function usage statistics to the collector. Note that this is
|
|
* called only when not within a transaction, so it is fair to use
|
|
* transaction stop time as an approximation of current time.
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_report_stat(bool force)
|
|
{
|
|
/* we assume this inits to all zeroes: */
|
|
static const PgStat_TableCounts all_zeroes;
|
|
static TimestampTz last_report = 0;
|
|
|
|
TimestampTz now;
|
|
PgStat_MsgTabstat regular_msg;
|
|
PgStat_MsgTabstat shared_msg;
|
|
TabStatusArray *tsa;
|
|
int i;
|
|
|
|
/* Don't expend a clock check if nothing to do */
|
|
if ((pgStatTabList == NULL || pgStatTabList->tsa_used == 0)
|
|
&& !have_function_stats)
|
|
return;
|
|
|
|
/*
|
|
* Don't send a message unless it's been at least PGSTAT_STAT_INTERVAL
|
|
* msec since we last sent one, or the caller wants to force stats out.
|
|
*/
|
|
now = GetCurrentTransactionStopTimestamp();
|
|
if (!force &&
|
|
!TimestampDifferenceExceeds(last_report, now, PGSTAT_STAT_INTERVAL))
|
|
return;
|
|
last_report = now;
|
|
|
|
/*
|
|
* Scan through the TabStatusArray struct(s) to find tables that actually
|
|
* have counts, and build messages to send. We have to separate shared
|
|
* relations from regular ones because the databaseid field in the message
|
|
* header has to depend on that.
|
|
*/
|
|
regular_msg.m_databaseid = MyDatabaseId;
|
|
shared_msg.m_databaseid = InvalidOid;
|
|
regular_msg.m_nentries = 0;
|
|
shared_msg.m_nentries = 0;
|
|
|
|
for (tsa = pgStatTabList; tsa != NULL; tsa = tsa->tsa_next)
|
|
{
|
|
for (i = 0; i < tsa->tsa_used; i++)
|
|
{
|
|
PgStat_TableStatus *entry = &tsa->tsa_entries[i];
|
|
PgStat_MsgTabstat *this_msg;
|
|
PgStat_TableEntry *this_ent;
|
|
|
|
/* Shouldn't have any pending transaction-dependent counts */
|
|
Assert(entry->trans == NULL);
|
|
|
|
/*
|
|
* Ignore entries that didn't accumulate any actual counts, such
|
|
* as indexes that were opened by the planner but not used.
|
|
*/
|
|
if (memcmp(&entry->t_counts, &all_zeroes,
|
|
sizeof(PgStat_TableCounts)) == 0)
|
|
continue;
|
|
|
|
/*
|
|
* OK, insert data into the appropriate message, and send if full.
|
|
*/
|
|
this_msg = entry->t_shared ? &shared_msg : ®ular_msg;
|
|
this_ent = &this_msg->m_entry[this_msg->m_nentries];
|
|
this_ent->t_id = entry->t_id;
|
|
memcpy(&this_ent->t_counts, &entry->t_counts,
|
|
sizeof(PgStat_TableCounts));
|
|
if (++this_msg->m_nentries >= PGSTAT_NUM_TABENTRIES)
|
|
{
|
|
pgstat_send_tabstat(this_msg);
|
|
this_msg->m_nentries = 0;
|
|
}
|
|
}
|
|
/* zero out TableStatus structs after use */
|
|
MemSet(tsa->tsa_entries, 0,
|
|
tsa->tsa_used * sizeof(PgStat_TableStatus));
|
|
tsa->tsa_used = 0;
|
|
}
|
|
|
|
/*
|
|
* Send partial messages. If force is true, make sure that any pending
|
|
* xact commit/abort gets counted, even if no table stats to send.
|
|
*/
|
|
if (regular_msg.m_nentries > 0 ||
|
|
(force && (pgStatXactCommit > 0 || pgStatXactRollback > 0)))
|
|
pgstat_send_tabstat(®ular_msg);
|
|
if (shared_msg.m_nentries > 0)
|
|
pgstat_send_tabstat(&shared_msg);
|
|
|
|
/* Now, send function statistics */
|
|
pgstat_send_funcstats();
|
|
}
|
|
|
|
/*
|
|
* Subroutine for pgstat_report_stat: finish and send a tabstat message
|
|
*/
|
|
static void
|
|
pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg)
|
|
{
|
|
int n;
|
|
int len;
|
|
|
|
/* It's unlikely we'd get here with no socket, but maybe not impossible */
|
|
if (pgStatSock < 0)
|
|
return;
|
|
|
|
/*
|
|
* Report accumulated xact commit/rollback whenever we send a normal
|
|
* tabstat message
|
|
*/
|
|
if (OidIsValid(tsmsg->m_databaseid))
|
|
{
|
|
tsmsg->m_xact_commit = pgStatXactCommit;
|
|
tsmsg->m_xact_rollback = pgStatXactRollback;
|
|
pgStatXactCommit = 0;
|
|
pgStatXactRollback = 0;
|
|
}
|
|
else
|
|
{
|
|
tsmsg->m_xact_commit = 0;
|
|
tsmsg->m_xact_rollback = 0;
|
|
}
|
|
|
|
n = tsmsg->m_nentries;
|
|
len = offsetof(PgStat_MsgTabstat, m_entry[0]) +
|
|
n * sizeof(PgStat_TableEntry);
|
|
|
|
pgstat_setheader(&tsmsg->m_hdr, PGSTAT_MTYPE_TABSTAT);
|
|
pgstat_send(tsmsg, len);
|
|
}
|
|
|
|
/*
|
|
* Subroutine for pgstat_report_stat: populate and send a function stat message
|
|
*/
|
|
static void
|
|
pgstat_send_funcstats(void)
|
|
{
|
|
/* we assume this inits to all zeroes: */
|
|
static const PgStat_FunctionCounts all_zeroes;
|
|
|
|
PgStat_MsgFuncstat msg;
|
|
PgStat_BackendFunctionEntry *entry;
|
|
HASH_SEQ_STATUS fstat;
|
|
|
|
if (pgStatFunctions == NULL)
|
|
return;
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_FUNCSTAT);
|
|
msg.m_databaseid = MyDatabaseId;
|
|
msg.m_nentries = 0;
|
|
|
|
hash_seq_init(&fstat, pgStatFunctions);
|
|
while ((entry = (PgStat_BackendFunctionEntry *) hash_seq_search(&fstat)) != NULL)
|
|
{
|
|
PgStat_FunctionEntry *m_ent;
|
|
|
|
/* Skip it if no counts accumulated since last time */
|
|
if (memcmp(&entry->f_counts, &all_zeroes,
|
|
sizeof(PgStat_FunctionCounts)) == 0)
|
|
continue;
|
|
|
|
/* need to convert format of time accumulators */
|
|
m_ent = &msg.m_entry[msg.m_nentries];
|
|
m_ent->f_id = entry->f_id;
|
|
m_ent->f_numcalls = entry->f_counts.f_numcalls;
|
|
m_ent->f_time = INSTR_TIME_GET_MICROSEC(entry->f_counts.f_time);
|
|
m_ent->f_time_self = INSTR_TIME_GET_MICROSEC(entry->f_counts.f_time_self);
|
|
|
|
if (++msg.m_nentries >= PGSTAT_NUM_FUNCENTRIES)
|
|
{
|
|
pgstat_send(&msg, offsetof(PgStat_MsgFuncstat, m_entry[0]) +
|
|
msg.m_nentries * sizeof(PgStat_FunctionEntry));
|
|
msg.m_nentries = 0;
|
|
}
|
|
|
|
/* reset the entry's counts */
|
|
MemSet(&entry->f_counts, 0, sizeof(PgStat_FunctionCounts));
|
|
}
|
|
|
|
if (msg.m_nentries > 0)
|
|
pgstat_send(&msg, offsetof(PgStat_MsgFuncstat, m_entry[0]) +
|
|
msg.m_nentries * sizeof(PgStat_FunctionEntry));
|
|
|
|
have_function_stats = false;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_vacuum_stat() -
|
|
*
|
|
* Will tell the collector about objects he can get rid of.
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_vacuum_stat(void)
|
|
{
|
|
HTAB *htab;
|
|
PgStat_MsgTabpurge msg;
|
|
PgStat_MsgFuncpurge f_msg;
|
|
HASH_SEQ_STATUS hstat;
|
|
PgStat_StatDBEntry *dbentry;
|
|
PgStat_StatTabEntry *tabentry;
|
|
PgStat_StatFuncEntry *funcentry;
|
|
int len;
|
|
|
|
if (pgStatSock < 0)
|
|
return;
|
|
|
|
/*
|
|
* If not done for this transaction, read the statistics collector stats
|
|
* file into some hash tables.
|
|
*/
|
|
backend_read_statsfile();
|
|
|
|
/*
|
|
* Read pg_database and make a list of OIDs of all existing databases
|
|
*/
|
|
htab = pgstat_collect_oids(DatabaseRelationId);
|
|
|
|
/*
|
|
* Search the database hash table for dead databases and tell the
|
|
* collector to drop them.
|
|
*/
|
|
hash_seq_init(&hstat, pgStatDBHash);
|
|
while ((dbentry = (PgStat_StatDBEntry *) hash_seq_search(&hstat)) != NULL)
|
|
{
|
|
Oid dbid = dbentry->databaseid;
|
|
|
|
CHECK_FOR_INTERRUPTS();
|
|
|
|
/* the DB entry for shared tables (with InvalidOid) is never dropped */
|
|
if (OidIsValid(dbid) &&
|
|
hash_search(htab, (void *) &dbid, HASH_FIND, NULL) == NULL)
|
|
pgstat_drop_database(dbid);
|
|
}
|
|
|
|
/* Clean up */
|
|
hash_destroy(htab);
|
|
|
|
/*
|
|
* Lookup our own database entry; if not found, nothing more to do.
|
|
*/
|
|
dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
|
|
(void *) &MyDatabaseId,
|
|
HASH_FIND, NULL);
|
|
if (dbentry == NULL || dbentry->tables == NULL)
|
|
return;
|
|
|
|
/*
|
|
* Similarly to above, make a list of all known relations in this DB.
|
|
*/
|
|
htab = pgstat_collect_oids(RelationRelationId);
|
|
|
|
/*
|
|
* Initialize our messages table counter to zero
|
|
*/
|
|
msg.m_nentries = 0;
|
|
|
|
/*
|
|
* Check for all tables listed in stats hashtable if they still exist.
|
|
*/
|
|
hash_seq_init(&hstat, dbentry->tables);
|
|
while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&hstat)) != NULL)
|
|
{
|
|
Oid tabid = tabentry->tableid;
|
|
|
|
CHECK_FOR_INTERRUPTS();
|
|
|
|
if (hash_search(htab, (void *) &tabid, HASH_FIND, NULL) != NULL)
|
|
continue;
|
|
|
|
/*
|
|
* Not there, so add this table's Oid to the message
|
|
*/
|
|
msg.m_tableid[msg.m_nentries++] = tabid;
|
|
|
|
/*
|
|
* If the message is full, send it out and reinitialize to empty
|
|
*/
|
|
if (msg.m_nentries >= PGSTAT_NUM_TABPURGE)
|
|
{
|
|
len = offsetof(PgStat_MsgTabpurge, m_tableid[0])
|
|
+msg.m_nentries * sizeof(Oid);
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
|
|
msg.m_databaseid = MyDatabaseId;
|
|
pgstat_send(&msg, len);
|
|
|
|
msg.m_nentries = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send the rest
|
|
*/
|
|
if (msg.m_nentries > 0)
|
|
{
|
|
len = offsetof(PgStat_MsgTabpurge, m_tableid[0])
|
|
+msg.m_nentries * sizeof(Oid);
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
|
|
msg.m_databaseid = MyDatabaseId;
|
|
pgstat_send(&msg, len);
|
|
}
|
|
|
|
/* Clean up */
|
|
hash_destroy(htab);
|
|
|
|
/*
|
|
* Now repeat the above steps for functions. However, we needn't bother
|
|
* in the common case where no function stats are being collected.
|
|
*/
|
|
if (dbentry->functions != NULL &&
|
|
hash_get_num_entries(dbentry->functions) > 0)
|
|
{
|
|
htab = pgstat_collect_oids(ProcedureRelationId);
|
|
|
|
pgstat_setheader(&f_msg.m_hdr, PGSTAT_MTYPE_FUNCPURGE);
|
|
f_msg.m_databaseid = MyDatabaseId;
|
|
f_msg.m_nentries = 0;
|
|
|
|
hash_seq_init(&hstat, dbentry->functions);
|
|
while ((funcentry = (PgStat_StatFuncEntry *) hash_seq_search(&hstat)) != NULL)
|
|
{
|
|
Oid funcid = funcentry->functionid;
|
|
|
|
CHECK_FOR_INTERRUPTS();
|
|
|
|
if (hash_search(htab, (void *) &funcid, HASH_FIND, NULL) != NULL)
|
|
continue;
|
|
|
|
/*
|
|
* Not there, so add this function's Oid to the message
|
|
*/
|
|
f_msg.m_functionid[f_msg.m_nentries++] = funcid;
|
|
|
|
/*
|
|
* If the message is full, send it out and reinitialize to empty
|
|
*/
|
|
if (f_msg.m_nentries >= PGSTAT_NUM_FUNCPURGE)
|
|
{
|
|
len = offsetof(PgStat_MsgFuncpurge, m_functionid[0])
|
|
+f_msg.m_nentries * sizeof(Oid);
|
|
|
|
pgstat_send(&f_msg, len);
|
|
|
|
f_msg.m_nentries = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send the rest
|
|
*/
|
|
if (f_msg.m_nentries > 0)
|
|
{
|
|
len = offsetof(PgStat_MsgFuncpurge, m_functionid[0])
|
|
+f_msg.m_nentries * sizeof(Oid);
|
|
|
|
pgstat_send(&f_msg, len);
|
|
}
|
|
|
|
hash_destroy(htab);
|
|
}
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_collect_oids() -
|
|
*
|
|
* Collect the OIDs of all objects listed in the specified system catalog
|
|
* into a temporary hash table. Caller should hash_destroy the result
|
|
* when done with it.
|
|
* ----------
|
|
*/
|
|
static HTAB *
|
|
pgstat_collect_oids(Oid catalogid)
|
|
{
|
|
HTAB *htab;
|
|
HASHCTL hash_ctl;
|
|
Relation rel;
|
|
HeapScanDesc scan;
|
|
HeapTuple tup;
|
|
|
|
memset(&hash_ctl, 0, sizeof(hash_ctl));
|
|
hash_ctl.keysize = sizeof(Oid);
|
|
hash_ctl.entrysize = sizeof(Oid);
|
|
hash_ctl.hash = oid_hash;
|
|
htab = hash_create("Temporary table of OIDs",
|
|
PGSTAT_TAB_HASH_SIZE,
|
|
&hash_ctl,
|
|
HASH_ELEM | HASH_FUNCTION);
|
|
|
|
rel = heap_open(catalogid, AccessShareLock);
|
|
scan = heap_beginscan(rel, SnapshotNow, 0, NULL);
|
|
while ((tup = heap_getnext(scan, ForwardScanDirection)) != NULL)
|
|
{
|
|
Oid thisoid = HeapTupleGetOid(tup);
|
|
|
|
CHECK_FOR_INTERRUPTS();
|
|
|
|
(void) hash_search(htab, (void *) &thisoid, HASH_ENTER, NULL);
|
|
}
|
|
heap_endscan(scan);
|
|
heap_close(rel, AccessShareLock);
|
|
|
|
return htab;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_drop_database() -
|
|
*
|
|
* Tell the collector that we just dropped a database.
|
|
* (If the message gets lost, we will still clean the dead DB eventually
|
|
* via future invocations of pgstat_vacuum_stat().)
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_drop_database(Oid databaseid)
|
|
{
|
|
PgStat_MsgDropdb msg;
|
|
|
|
if (pgStatSock < 0)
|
|
return;
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DROPDB);
|
|
msg.m_databaseid = databaseid;
|
|
pgstat_send(&msg, sizeof(msg));
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_drop_relation() -
|
|
*
|
|
* Tell the collector that we just dropped a relation.
|
|
* (If the message gets lost, we will still clean the dead entry eventually
|
|
* via future invocations of pgstat_vacuum_stat().)
|
|
*
|
|
* Currently not used for lack of any good place to call it; we rely
|
|
* entirely on pgstat_vacuum_stat() to clean out stats for dead rels.
|
|
* ----------
|
|
*/
|
|
#ifdef NOT_USED
|
|
void
|
|
pgstat_drop_relation(Oid relid)
|
|
{
|
|
PgStat_MsgTabpurge msg;
|
|
int len;
|
|
|
|
if (pgStatSock < 0)
|
|
return;
|
|
|
|
msg.m_tableid[0] = relid;
|
|
msg.m_nentries = 1;
|
|
|
|
len = offsetof(PgStat_MsgTabpurge, m_tableid[0]) +sizeof(Oid);
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
|
|
msg.m_databaseid = MyDatabaseId;
|
|
pgstat_send(&msg, len);
|
|
}
|
|
#endif /* NOT_USED */
|
|
|
|
|
|
/* ----------
|
|
* pgstat_reset_counters() -
|
|
*
|
|
* Tell the statistics collector to reset counters for our database.
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_reset_counters(void)
|
|
{
|
|
PgStat_MsgResetcounter msg;
|
|
|
|
if (pgStatSock < 0)
|
|
return;
|
|
|
|
if (!superuser())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
|
|
errmsg("must be superuser to reset statistics counters")));
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETCOUNTER);
|
|
msg.m_databaseid = MyDatabaseId;
|
|
pgstat_send(&msg, sizeof(msg));
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_report_autovac() -
|
|
*
|
|
* Called from autovacuum.c to report startup of an autovacuum process.
|
|
* We are called before InitPostgres is done, so can't rely on MyDatabaseId;
|
|
* the db OID must be passed in, instead.
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_report_autovac(Oid dboid)
|
|
{
|
|
PgStat_MsgAutovacStart msg;
|
|
|
|
if (pgStatSock < 0)
|
|
return;
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_AUTOVAC_START);
|
|
msg.m_databaseid = dboid;
|
|
msg.m_start_time = GetCurrentTimestamp();
|
|
|
|
pgstat_send(&msg, sizeof(msg));
|
|
}
|
|
|
|
|
|
/* ---------
|
|
* pgstat_report_vacuum() -
|
|
*
|
|
* Tell the collector about the table we just vacuumed.
|
|
* ---------
|
|
*/
|
|
void
|
|
pgstat_report_vacuum(Oid tableoid, bool shared, bool scanned_all,
|
|
bool analyze, PgStat_Counter tuples)
|
|
{
|
|
PgStat_MsgVacuum msg;
|
|
|
|
if (pgStatSock < 0 || !pgstat_track_counts)
|
|
return;
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_VACUUM);
|
|
msg.m_databaseid = shared ? InvalidOid : MyDatabaseId;
|
|
msg.m_tableoid = tableoid;
|
|
msg.m_scanned_all = scanned_all;
|
|
msg.m_analyze = analyze;
|
|
msg.m_autovacuum = IsAutoVacuumWorkerProcess(); /* is this autovacuum? */
|
|
msg.m_vacuumtime = GetCurrentTimestamp();
|
|
msg.m_tuples = tuples;
|
|
pgstat_send(&msg, sizeof(msg));
|
|
}
|
|
|
|
/* --------
|
|
* pgstat_report_analyze() -
|
|
*
|
|
* Tell the collector about the table we just analyzed.
|
|
* --------
|
|
*/
|
|
void
|
|
pgstat_report_analyze(Relation rel, PgStat_Counter livetuples,
|
|
PgStat_Counter deadtuples)
|
|
{
|
|
PgStat_MsgAnalyze msg;
|
|
|
|
if (pgStatSock < 0 || !pgstat_track_counts)
|
|
return;
|
|
|
|
/*
|
|
* Unlike VACUUM, ANALYZE might be running inside a transaction that has
|
|
* already inserted and/or deleted rows in the target table. ANALYZE will
|
|
* have counted such rows as live or dead respectively. Because we will
|
|
* report our counts of such rows at transaction end, we should subtract
|
|
* off these counts from what we send to the collector now, else they'll
|
|
* be double-counted after commit. (This approach also ensures that the
|
|
* collector ends up with the right numbers if we abort instead of
|
|
* committing.)
|
|
*/
|
|
if (rel->pgstat_info != NULL)
|
|
{
|
|
PgStat_TableXactStatus *trans;
|
|
|
|
for (trans = rel->pgstat_info->trans; trans; trans = trans->upper)
|
|
{
|
|
livetuples -= trans->tuples_inserted - trans->tuples_deleted;
|
|
deadtuples -= trans->tuples_deleted;
|
|
}
|
|
/* count stuff inserted by already-aborted subxacts, too */
|
|
deadtuples -= rel->pgstat_info->t_counts.t_new_dead_tuples;
|
|
/* Since ANALYZE's counts are estimates, we could have underflowed */
|
|
livetuples = Max(livetuples, 0);
|
|
deadtuples = Max(deadtuples, 0);
|
|
}
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_ANALYZE);
|
|
msg.m_databaseid = rel->rd_rel->relisshared ? InvalidOid : MyDatabaseId;
|
|
msg.m_tableoid = RelationGetRelid(rel);
|
|
msg.m_autovacuum = IsAutoVacuumWorkerProcess(); /* is this autovacuum? */
|
|
msg.m_analyzetime = GetCurrentTimestamp();
|
|
msg.m_live_tuples = livetuples;
|
|
msg.m_dead_tuples = deadtuples;
|
|
pgstat_send(&msg, sizeof(msg));
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_ping() -
|
|
*
|
|
* Send some junk data to the collector to increase traffic.
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_ping(void)
|
|
{
|
|
PgStat_MsgDummy msg;
|
|
|
|
if (pgStatSock < 0)
|
|
return;
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DUMMY);
|
|
pgstat_send(&msg, sizeof(msg));
|
|
}
|
|
|
|
/* ----------
|
|
* pgstat_send_inquiry() -
|
|
*
|
|
* Notify collector that we need fresh data.
|
|
* ts specifies the minimum acceptable timestamp for the stats file.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_send_inquiry(TimestampTz ts)
|
|
{
|
|
PgStat_MsgInquiry msg;
|
|
|
|
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_INQUIRY);
|
|
msg.inquiry_time = ts;
|
|
pgstat_send(&msg, sizeof(msg));
|
|
}
|
|
|
|
|
|
/*
|
|
* Initialize function call usage data.
|
|
* Called by the executor before invoking a function.
|
|
*/
|
|
void
|
|
pgstat_init_function_usage(FunctionCallInfoData *fcinfo,
|
|
PgStat_FunctionCallUsage *fcu)
|
|
{
|
|
PgStat_BackendFunctionEntry *htabent;
|
|
bool found;
|
|
|
|
if (pgstat_track_functions <= fcinfo->flinfo->fn_stats)
|
|
{
|
|
/* stats not wanted */
|
|
fcu->fs = NULL;
|
|
return;
|
|
}
|
|
|
|
if (!pgStatFunctions)
|
|
{
|
|
/* First time through - initialize function stat table */
|
|
HASHCTL hash_ctl;
|
|
|
|
memset(&hash_ctl, 0, sizeof(hash_ctl));
|
|
hash_ctl.keysize = sizeof(Oid);
|
|
hash_ctl.entrysize = sizeof(PgStat_BackendFunctionEntry);
|
|
hash_ctl.hash = oid_hash;
|
|
pgStatFunctions = hash_create("Function stat entries",
|
|
PGSTAT_FUNCTION_HASH_SIZE,
|
|
&hash_ctl,
|
|
HASH_ELEM | HASH_FUNCTION);
|
|
}
|
|
|
|
/* Get the stats entry for this function, create if necessary */
|
|
htabent = hash_search(pgStatFunctions, &fcinfo->flinfo->fn_oid,
|
|
HASH_ENTER, &found);
|
|
if (!found)
|
|
MemSet(&htabent->f_counts, 0, sizeof(PgStat_FunctionCounts));
|
|
|
|
fcu->fs = &htabent->f_counts;
|
|
|
|
/* save stats for this function, later used to compensate for recursion */
|
|
fcu->save_f_time = htabent->f_counts.f_time;
|
|
|
|
/* save current backend-wide total time */
|
|
fcu->save_total = total_func_time;
|
|
|
|
/* get clock time as of function start */
|
|
INSTR_TIME_SET_CURRENT(fcu->f_start);
|
|
}
|
|
|
|
/*
|
|
* Calculate function call usage and update stat counters.
|
|
* Called by the executor after invoking a function.
|
|
*
|
|
* In the case of a set-returning function that runs in value-per-call mode,
|
|
* we will see multiple pgstat_init_function_usage/pgstat_end_function_usage
|
|
* calls for what the user considers a single call of the function. The
|
|
* finalize flag should be TRUE on the last call.
|
|
*/
|
|
void
|
|
pgstat_end_function_usage(PgStat_FunctionCallUsage *fcu, bool finalize)
|
|
{
|
|
PgStat_FunctionCounts *fs = fcu->fs;
|
|
instr_time f_total;
|
|
instr_time f_others;
|
|
instr_time f_self;
|
|
|
|
/* stats not wanted? */
|
|
if (fs == NULL)
|
|
return;
|
|
|
|
/* total elapsed time in this function call */
|
|
INSTR_TIME_SET_CURRENT(f_total);
|
|
INSTR_TIME_SUBTRACT(f_total, fcu->f_start);
|
|
|
|
/* self usage: elapsed minus anything already charged to other calls */
|
|
f_others = total_func_time;
|
|
INSTR_TIME_SUBTRACT(f_others, fcu->save_total);
|
|
f_self = f_total;
|
|
INSTR_TIME_SUBTRACT(f_self, f_others);
|
|
|
|
/* update backend-wide total time */
|
|
INSTR_TIME_ADD(total_func_time, f_self);
|
|
|
|
/*
|
|
* Compute the new total f_time as the total elapsed time added to the
|
|
* pre-call value of f_time. This is necessary to avoid double-counting
|
|
* any time taken by recursive calls of myself. (We do not need any
|
|
* similar kluge for self time, since that already excludes any recursive
|
|
* calls.)
|
|
*/
|
|
INSTR_TIME_ADD(f_total, fcu->save_f_time);
|
|
|
|
/* update counters in function stats table */
|
|
if (finalize)
|
|
fs->f_numcalls++;
|
|
fs->f_time = f_total;
|
|
INSTR_TIME_ADD(fs->f_time_self, f_self);
|
|
|
|
/* indicate that we have something to send */
|
|
have_function_stats = true;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_initstats() -
|
|
*
|
|
* Initialize a relcache entry to count access statistics.
|
|
* Called whenever a relation is opened.
|
|
*
|
|
* We assume that a relcache entry's pgstat_info field is zeroed by
|
|
* relcache.c when the relcache entry is made; thereafter it is long-lived
|
|
* data. We can avoid repeated searches of the TabStatus arrays when the
|
|
* same relation is touched repeatedly within a transaction.
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_initstats(Relation rel)
|
|
{
|
|
Oid rel_id = rel->rd_id;
|
|
char relkind = rel->rd_rel->relkind;
|
|
|
|
/* We only count stats for things that have storage */
|
|
if (!(relkind == RELKIND_RELATION ||
|
|
relkind == RELKIND_INDEX ||
|
|
relkind == RELKIND_TOASTVALUE ||
|
|
relkind == RELKIND_SEQUENCE))
|
|
{
|
|
rel->pgstat_info = NULL;
|
|
return;
|
|
}
|
|
|
|
if (pgStatSock < 0 || !pgstat_track_counts)
|
|
{
|
|
/* We're not counting at all */
|
|
rel->pgstat_info = NULL;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If we already set up this relation in the current transaction, nothing
|
|
* to do.
|
|
*/
|
|
if (rel->pgstat_info != NULL &&
|
|
rel->pgstat_info->t_id == rel_id)
|
|
return;
|
|
|
|
/* Else find or make the PgStat_TableStatus entry, and update link */
|
|
rel->pgstat_info = get_tabstat_entry(rel_id, rel->rd_rel->relisshared);
|
|
}
|
|
|
|
/*
|
|
* get_tabstat_entry - find or create a PgStat_TableStatus entry for rel
|
|
*/
|
|
static PgStat_TableStatus *
|
|
get_tabstat_entry(Oid rel_id, bool isshared)
|
|
{
|
|
PgStat_TableStatus *entry;
|
|
TabStatusArray *tsa;
|
|
TabStatusArray *prev_tsa;
|
|
int i;
|
|
|
|
/*
|
|
* Search the already-used tabstat slots for this relation.
|
|
*/
|
|
prev_tsa = NULL;
|
|
for (tsa = pgStatTabList; tsa != NULL; prev_tsa = tsa, tsa = tsa->tsa_next)
|
|
{
|
|
for (i = 0; i < tsa->tsa_used; i++)
|
|
{
|
|
entry = &tsa->tsa_entries[i];
|
|
if (entry->t_id == rel_id)
|
|
return entry;
|
|
}
|
|
|
|
if (tsa->tsa_used < TABSTAT_QUANTUM)
|
|
{
|
|
/*
|
|
* It must not be present, but we found a free slot instead. Fine,
|
|
* let's use this one. We assume the entry was already zeroed,
|
|
* either at creation or after last use.
|
|
*/
|
|
entry = &tsa->tsa_entries[tsa->tsa_used++];
|
|
entry->t_id = rel_id;
|
|
entry->t_shared = isshared;
|
|
return entry;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We ran out of tabstat slots, so allocate more. Be sure they're zeroed.
|
|
*/
|
|
tsa = (TabStatusArray *) MemoryContextAllocZero(TopMemoryContext,
|
|
sizeof(TabStatusArray));
|
|
if (prev_tsa)
|
|
prev_tsa->tsa_next = tsa;
|
|
else
|
|
pgStatTabList = tsa;
|
|
|
|
/*
|
|
* Use the first entry of the new TabStatusArray.
|
|
*/
|
|
entry = &tsa->tsa_entries[tsa->tsa_used++];
|
|
entry->t_id = rel_id;
|
|
entry->t_shared = isshared;
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* get_tabstat_stack_level - add a new (sub)transaction stack entry if needed
|
|
*/
|
|
static PgStat_SubXactStatus *
|
|
get_tabstat_stack_level(int nest_level)
|
|
{
|
|
PgStat_SubXactStatus *xact_state;
|
|
|
|
xact_state = pgStatXactStack;
|
|
if (xact_state == NULL || xact_state->nest_level != nest_level)
|
|
{
|
|
xact_state = (PgStat_SubXactStatus *)
|
|
MemoryContextAlloc(TopTransactionContext,
|
|
sizeof(PgStat_SubXactStatus));
|
|
xact_state->nest_level = nest_level;
|
|
xact_state->prev = pgStatXactStack;
|
|
xact_state->first = NULL;
|
|
pgStatXactStack = xact_state;
|
|
}
|
|
return xact_state;
|
|
}
|
|
|
|
/*
|
|
* add_tabstat_xact_level - add a new (sub)transaction state record
|
|
*/
|
|
static void
|
|
add_tabstat_xact_level(PgStat_TableStatus *pgstat_info, int nest_level)
|
|
{
|
|
PgStat_SubXactStatus *xact_state;
|
|
PgStat_TableXactStatus *trans;
|
|
|
|
/*
|
|
* If this is the first rel to be modified at the current nest level, we
|
|
* first have to push a transaction stack entry.
|
|
*/
|
|
xact_state = get_tabstat_stack_level(nest_level);
|
|
|
|
/* Now make a per-table stack entry */
|
|
trans = (PgStat_TableXactStatus *)
|
|
MemoryContextAllocZero(TopTransactionContext,
|
|
sizeof(PgStat_TableXactStatus));
|
|
trans->nest_level = nest_level;
|
|
trans->upper = pgstat_info->trans;
|
|
trans->parent = pgstat_info;
|
|
trans->next = xact_state->first;
|
|
xact_state->first = trans;
|
|
pgstat_info->trans = trans;
|
|
}
|
|
|
|
/*
|
|
* pgstat_count_heap_insert - count a tuple insertion
|
|
*/
|
|
void
|
|
pgstat_count_heap_insert(Relation rel)
|
|
{
|
|
PgStat_TableStatus *pgstat_info = rel->pgstat_info;
|
|
|
|
if (pgstat_track_counts && pgstat_info != NULL)
|
|
{
|
|
int nest_level = GetCurrentTransactionNestLevel();
|
|
|
|
/* t_tuples_inserted is nontransactional, so just advance it */
|
|
pgstat_info->t_counts.t_tuples_inserted++;
|
|
|
|
/* We have to log the transactional effect at the proper level */
|
|
if (pgstat_info->trans == NULL ||
|
|
pgstat_info->trans->nest_level != nest_level)
|
|
add_tabstat_xact_level(pgstat_info, nest_level);
|
|
|
|
pgstat_info->trans->tuples_inserted++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* pgstat_count_heap_update - count a tuple update
|
|
*/
|
|
void
|
|
pgstat_count_heap_update(Relation rel, bool hot)
|
|
{
|
|
PgStat_TableStatus *pgstat_info = rel->pgstat_info;
|
|
|
|
if (pgstat_track_counts && pgstat_info != NULL)
|
|
{
|
|
int nest_level = GetCurrentTransactionNestLevel();
|
|
|
|
/* t_tuples_updated is nontransactional, so just advance it */
|
|
pgstat_info->t_counts.t_tuples_updated++;
|
|
/* ditto for the hot_update counter */
|
|
if (hot)
|
|
pgstat_info->t_counts.t_tuples_hot_updated++;
|
|
|
|
/* We have to log the transactional effect at the proper level */
|
|
if (pgstat_info->trans == NULL ||
|
|
pgstat_info->trans->nest_level != nest_level)
|
|
add_tabstat_xact_level(pgstat_info, nest_level);
|
|
|
|
/* An UPDATE both inserts a new tuple and deletes the old */
|
|
pgstat_info->trans->tuples_inserted++;
|
|
pgstat_info->trans->tuples_deleted++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* pgstat_count_heap_delete - count a tuple deletion
|
|
*/
|
|
void
|
|
pgstat_count_heap_delete(Relation rel)
|
|
{
|
|
PgStat_TableStatus *pgstat_info = rel->pgstat_info;
|
|
|
|
if (pgstat_track_counts && pgstat_info != NULL)
|
|
{
|
|
int nest_level = GetCurrentTransactionNestLevel();
|
|
|
|
/* t_tuples_deleted is nontransactional, so just advance it */
|
|
pgstat_info->t_counts.t_tuples_deleted++;
|
|
|
|
/* We have to log the transactional effect at the proper level */
|
|
if (pgstat_info->trans == NULL ||
|
|
pgstat_info->trans->nest_level != nest_level)
|
|
add_tabstat_xact_level(pgstat_info, nest_level);
|
|
|
|
pgstat_info->trans->tuples_deleted++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* pgstat_update_heap_dead_tuples - update dead-tuples count
|
|
*
|
|
* The semantics of this are that we are reporting the nontransactional
|
|
* recovery of "delta" dead tuples; so t_new_dead_tuples decreases
|
|
* rather than increasing, and the change goes straight into the per-table
|
|
* counter, not into transactional state.
|
|
*/
|
|
void
|
|
pgstat_update_heap_dead_tuples(Relation rel, int delta)
|
|
{
|
|
PgStat_TableStatus *pgstat_info = rel->pgstat_info;
|
|
|
|
if (pgstat_track_counts && pgstat_info != NULL)
|
|
pgstat_info->t_counts.t_new_dead_tuples -= delta;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* AtEOXact_PgStat
|
|
*
|
|
* Called from access/transam/xact.c at top-level transaction commit/abort.
|
|
* ----------
|
|
*/
|
|
void
|
|
AtEOXact_PgStat(bool isCommit)
|
|
{
|
|
PgStat_SubXactStatus *xact_state;
|
|
|
|
/*
|
|
* Count transaction commit or abort. (We use counters, not just bools,
|
|
* in case the reporting message isn't sent right away.)
|
|
*/
|
|
if (isCommit)
|
|
pgStatXactCommit++;
|
|
else
|
|
pgStatXactRollback++;
|
|
|
|
/*
|
|
* Transfer transactional insert/update counts into the base tabstat
|
|
* entries. We don't bother to free any of the transactional state, since
|
|
* it's all in TopTransactionContext and will go away anyway.
|
|
*/
|
|
xact_state = pgStatXactStack;
|
|
if (xact_state != NULL)
|
|
{
|
|
PgStat_TableXactStatus *trans;
|
|
|
|
Assert(xact_state->nest_level == 1);
|
|
Assert(xact_state->prev == NULL);
|
|
for (trans = xact_state->first; trans != NULL; trans = trans->next)
|
|
{
|
|
PgStat_TableStatus *tabstat;
|
|
|
|
Assert(trans->nest_level == 1);
|
|
Assert(trans->upper == NULL);
|
|
tabstat = trans->parent;
|
|
Assert(tabstat->trans == trans);
|
|
if (isCommit)
|
|
{
|
|
tabstat->t_counts.t_new_live_tuples +=
|
|
trans->tuples_inserted - trans->tuples_deleted;
|
|
tabstat->t_counts.t_new_dead_tuples += trans->tuples_deleted;
|
|
}
|
|
else
|
|
{
|
|
/* inserted tuples are dead, deleted tuples are unaffected */
|
|
tabstat->t_counts.t_new_dead_tuples += trans->tuples_inserted;
|
|
}
|
|
tabstat->trans = NULL;
|
|
}
|
|
}
|
|
pgStatXactStack = NULL;
|
|
|
|
/* Make sure any stats snapshot is thrown away */
|
|
pgstat_clear_snapshot();
|
|
}
|
|
|
|
/* ----------
|
|
* AtEOSubXact_PgStat
|
|
*
|
|
* Called from access/transam/xact.c at subtransaction commit/abort.
|
|
* ----------
|
|
*/
|
|
void
|
|
AtEOSubXact_PgStat(bool isCommit, int nestDepth)
|
|
{
|
|
PgStat_SubXactStatus *xact_state;
|
|
|
|
/*
|
|
* Transfer transactional insert/update counts into the next higher
|
|
* subtransaction state.
|
|
*/
|
|
xact_state = pgStatXactStack;
|
|
if (xact_state != NULL &&
|
|
xact_state->nest_level >= nestDepth)
|
|
{
|
|
PgStat_TableXactStatus *trans;
|
|
PgStat_TableXactStatus *next_trans;
|
|
|
|
/* delink xact_state from stack immediately to simplify reuse case */
|
|
pgStatXactStack = xact_state->prev;
|
|
|
|
for (trans = xact_state->first; trans != NULL; trans = next_trans)
|
|
{
|
|
PgStat_TableStatus *tabstat;
|
|
|
|
next_trans = trans->next;
|
|
Assert(trans->nest_level == nestDepth);
|
|
tabstat = trans->parent;
|
|
Assert(tabstat->trans == trans);
|
|
if (isCommit)
|
|
{
|
|
if (trans->upper && trans->upper->nest_level == nestDepth - 1)
|
|
{
|
|
trans->upper->tuples_inserted += trans->tuples_inserted;
|
|
trans->upper->tuples_deleted += trans->tuples_deleted;
|
|
tabstat->trans = trans->upper;
|
|
pfree(trans);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* When there isn't an immediate parent state, we can just
|
|
* reuse the record instead of going through a
|
|
* palloc/pfree pushup (this works since it's all in
|
|
* TopTransactionContext anyway). We have to re-link it
|
|
* into the parent level, though, and that might mean
|
|
* pushing a new entry into the pgStatXactStack.
|
|
*/
|
|
PgStat_SubXactStatus *upper_xact_state;
|
|
|
|
upper_xact_state = get_tabstat_stack_level(nestDepth - 1);
|
|
trans->next = upper_xact_state->first;
|
|
upper_xact_state->first = trans;
|
|
trans->nest_level = nestDepth - 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* On abort, inserted tuples are dead (and can be bounced out
|
|
* to the top-level tabstat), deleted tuples are unaffected
|
|
*/
|
|
tabstat->t_counts.t_new_dead_tuples += trans->tuples_inserted;
|
|
tabstat->trans = trans->upper;
|
|
pfree(trans);
|
|
}
|
|
}
|
|
pfree(xact_state);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* AtPrepare_PgStat
|
|
* Save the transactional stats state at 2PC transaction prepare.
|
|
*
|
|
* In this phase we just generate 2PC records for all the pending
|
|
* transaction-dependent stats work.
|
|
*/
|
|
void
|
|
AtPrepare_PgStat(void)
|
|
{
|
|
PgStat_SubXactStatus *xact_state;
|
|
|
|
xact_state = pgStatXactStack;
|
|
if (xact_state != NULL)
|
|
{
|
|
PgStat_TableXactStatus *trans;
|
|
|
|
Assert(xact_state->nest_level == 1);
|
|
Assert(xact_state->prev == NULL);
|
|
for (trans = xact_state->first; trans != NULL; trans = trans->next)
|
|
{
|
|
PgStat_TableStatus *tabstat;
|
|
TwoPhasePgStatRecord record;
|
|
|
|
Assert(trans->nest_level == 1);
|
|
Assert(trans->upper == NULL);
|
|
tabstat = trans->parent;
|
|
Assert(tabstat->trans == trans);
|
|
|
|
record.tuples_inserted = trans->tuples_inserted;
|
|
record.tuples_deleted = trans->tuples_deleted;
|
|
record.t_id = tabstat->t_id;
|
|
record.t_shared = tabstat->t_shared;
|
|
|
|
RegisterTwoPhaseRecord(TWOPHASE_RM_PGSTAT_ID, 0,
|
|
&record, sizeof(TwoPhasePgStatRecord));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* PostPrepare_PgStat
|
|
* Clean up after successful PREPARE.
|
|
*
|
|
* All we need do here is unlink the transaction stats state from the
|
|
* nontransactional state. The nontransactional action counts will be
|
|
* reported to the stats collector immediately, while the effects on live
|
|
* and dead tuple counts are preserved in the 2PC state file.
|
|
*
|
|
* Note: AtEOXact_PgStat is not called during PREPARE.
|
|
*/
|
|
void
|
|
PostPrepare_PgStat(void)
|
|
{
|
|
PgStat_SubXactStatus *xact_state;
|
|
|
|
/*
|
|
* We don't bother to free any of the transactional state, since it's all
|
|
* in TopTransactionContext and will go away anyway.
|
|
*/
|
|
xact_state = pgStatXactStack;
|
|
if (xact_state != NULL)
|
|
{
|
|
PgStat_TableXactStatus *trans;
|
|
|
|
for (trans = xact_state->first; trans != NULL; trans = trans->next)
|
|
{
|
|
PgStat_TableStatus *tabstat;
|
|
|
|
tabstat = trans->parent;
|
|
tabstat->trans = NULL;
|
|
}
|
|
}
|
|
pgStatXactStack = NULL;
|
|
|
|
/* Make sure any stats snapshot is thrown away */
|
|
pgstat_clear_snapshot();
|
|
}
|
|
|
|
/*
|
|
* 2PC processing routine for COMMIT PREPARED case.
|
|
*
|
|
* Load the saved counts into our local pgstats state.
|
|
*/
|
|
void
|
|
pgstat_twophase_postcommit(TransactionId xid, uint16 info,
|
|
void *recdata, uint32 len)
|
|
{
|
|
TwoPhasePgStatRecord *rec = (TwoPhasePgStatRecord *) recdata;
|
|
PgStat_TableStatus *pgstat_info;
|
|
|
|
/* Find or create a tabstat entry for the rel */
|
|
pgstat_info = get_tabstat_entry(rec->t_id, rec->t_shared);
|
|
|
|
pgstat_info->t_counts.t_new_live_tuples +=
|
|
rec->tuples_inserted - rec->tuples_deleted;
|
|
pgstat_info->t_counts.t_new_dead_tuples += rec->tuples_deleted;
|
|
}
|
|
|
|
/*
|
|
* 2PC processing routine for ROLLBACK PREPARED case.
|
|
*
|
|
* Load the saved counts into our local pgstats state, but treat them
|
|
* as aborted.
|
|
*/
|
|
void
|
|
pgstat_twophase_postabort(TransactionId xid, uint16 info,
|
|
void *recdata, uint32 len)
|
|
{
|
|
TwoPhasePgStatRecord *rec = (TwoPhasePgStatRecord *) recdata;
|
|
PgStat_TableStatus *pgstat_info;
|
|
|
|
/* Find or create a tabstat entry for the rel */
|
|
pgstat_info = get_tabstat_entry(rec->t_id, rec->t_shared);
|
|
|
|
/* inserted tuples are dead, deleted tuples are no-ops */
|
|
pgstat_info->t_counts.t_new_dead_tuples += rec->tuples_inserted;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_fetch_stat_dbentry() -
|
|
*
|
|
* Support function for the SQL-callable pgstat* functions. Returns
|
|
* the collected statistics for one database or NULL. NULL doesn't mean
|
|
* that the database doesn't exist, it is just not yet known by the
|
|
* collector, so the caller is better off to report ZERO instead.
|
|
* ----------
|
|
*/
|
|
PgStat_StatDBEntry *
|
|
pgstat_fetch_stat_dbentry(Oid dbid)
|
|
{
|
|
/*
|
|
* If not done for this transaction, read the statistics collector stats
|
|
* file into some hash tables.
|
|
*/
|
|
backend_read_statsfile();
|
|
|
|
/*
|
|
* Lookup the requested database; return NULL if not found
|
|
*/
|
|
return (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
|
|
(void *) &dbid,
|
|
HASH_FIND, NULL);
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_fetch_stat_tabentry() -
|
|
*
|
|
* Support function for the SQL-callable pgstat* functions. Returns
|
|
* the collected statistics for one table or NULL. NULL doesn't mean
|
|
* that the table doesn't exist, it is just not yet known by the
|
|
* collector, so the caller is better off to report ZERO instead.
|
|
* ----------
|
|
*/
|
|
PgStat_StatTabEntry *
|
|
pgstat_fetch_stat_tabentry(Oid relid)
|
|
{
|
|
Oid dbid;
|
|
PgStat_StatDBEntry *dbentry;
|
|
PgStat_StatTabEntry *tabentry;
|
|
|
|
/*
|
|
* If not done for this transaction, read the statistics collector stats
|
|
* file into some hash tables.
|
|
*/
|
|
backend_read_statsfile();
|
|
|
|
/*
|
|
* Lookup our database, then look in its table hash table.
|
|
*/
|
|
dbid = MyDatabaseId;
|
|
dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
|
|
(void *) &dbid,
|
|
HASH_FIND, NULL);
|
|
if (dbentry != NULL && dbentry->tables != NULL)
|
|
{
|
|
tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
|
|
(void *) &relid,
|
|
HASH_FIND, NULL);
|
|
if (tabentry)
|
|
return tabentry;
|
|
}
|
|
|
|
/*
|
|
* If we didn't find it, maybe it's a shared table.
|
|
*/
|
|
dbid = InvalidOid;
|
|
dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
|
|
(void *) &dbid,
|
|
HASH_FIND, NULL);
|
|
if (dbentry != NULL && dbentry->tables != NULL)
|
|
{
|
|
tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
|
|
(void *) &relid,
|
|
HASH_FIND, NULL);
|
|
if (tabentry)
|
|
return tabentry;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_fetch_stat_funcentry() -
|
|
*
|
|
* Support function for the SQL-callable pgstat* functions. Returns
|
|
* the collected statistics for one function or NULL.
|
|
* ----------
|
|
*/
|
|
PgStat_StatFuncEntry *
|
|
pgstat_fetch_stat_funcentry(Oid func_id)
|
|
{
|
|
PgStat_StatDBEntry *dbentry;
|
|
PgStat_StatFuncEntry *funcentry = NULL;
|
|
|
|
/* load the stats file if needed */
|
|
backend_read_statsfile();
|
|
|
|
/* Lookup our database, then find the requested function. */
|
|
dbentry = pgstat_fetch_stat_dbentry(MyDatabaseId);
|
|
if (dbentry != NULL && dbentry->functions != NULL)
|
|
{
|
|
funcentry = (PgStat_StatFuncEntry *) hash_search(dbentry->functions,
|
|
(void *) &func_id,
|
|
HASH_FIND, NULL);
|
|
}
|
|
|
|
return funcentry;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_fetch_stat_beentry() -
|
|
*
|
|
* Support function for the SQL-callable pgstat* functions. Returns
|
|
* our local copy of the current-activity entry for one backend.
|
|
*
|
|
* NB: caller is responsible for a check if the user is permitted to see
|
|
* this info (especially the querystring).
|
|
* ----------
|
|
*/
|
|
PgBackendStatus *
|
|
pgstat_fetch_stat_beentry(int beid)
|
|
{
|
|
pgstat_read_current_status();
|
|
|
|
if (beid < 1 || beid > localNumBackends)
|
|
return NULL;
|
|
|
|
return &localBackendStatusTable[beid - 1];
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_fetch_stat_numbackends() -
|
|
*
|
|
* Support function for the SQL-callable pgstat* functions. Returns
|
|
* the maximum current backend id.
|
|
* ----------
|
|
*/
|
|
int
|
|
pgstat_fetch_stat_numbackends(void)
|
|
{
|
|
pgstat_read_current_status();
|
|
|
|
return localNumBackends;
|
|
}
|
|
|
|
/*
|
|
* ---------
|
|
* pgstat_fetch_global() -
|
|
*
|
|
* Support function for the SQL-callable pgstat* functions. Returns
|
|
* a pointer to the global statistics struct.
|
|
* ---------
|
|
*/
|
|
PgStat_GlobalStats *
|
|
pgstat_fetch_global(void)
|
|
{
|
|
backend_read_statsfile();
|
|
|
|
return &globalStats;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------
|
|
* Functions for management of the shared-memory PgBackendStatus array
|
|
* ------------------------------------------------------------
|
|
*/
|
|
|
|
static PgBackendStatus *BackendStatusArray = NULL;
|
|
static PgBackendStatus *MyBEEntry = NULL;
|
|
static char *BackendActivityBuffer = NULL;
|
|
|
|
|
|
/*
|
|
* Report shared-memory space needed by CreateSharedBackendStatus.
|
|
*/
|
|
Size
|
|
BackendStatusShmemSize(void)
|
|
{
|
|
Size size;
|
|
|
|
size = add_size(mul_size(sizeof(PgBackendStatus), MaxBackends),
|
|
mul_size(pgstat_track_activity_query_size, MaxBackends));
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
* Initialize the shared status array and activity string buffer during
|
|
* postmaster startup.
|
|
*/
|
|
void
|
|
CreateSharedBackendStatus(void)
|
|
{
|
|
Size size;
|
|
bool found;
|
|
int i;
|
|
char *buffer;
|
|
|
|
/* Create or attach to the shared array */
|
|
size = mul_size(sizeof(PgBackendStatus), MaxBackends);
|
|
BackendStatusArray = (PgBackendStatus *)
|
|
ShmemInitStruct("Backend Status Array", size, &found);
|
|
|
|
if (!found)
|
|
{
|
|
/*
|
|
* We're the first - initialize.
|
|
*/
|
|
MemSet(BackendStatusArray, 0, size);
|
|
}
|
|
|
|
/* Create or attach to the shared activity buffer */
|
|
size = mul_size(pgstat_track_activity_query_size, MaxBackends);
|
|
BackendActivityBuffer = (char *)
|
|
ShmemInitStruct("Backend Activity Buffer", size, &found);
|
|
|
|
if (!found)
|
|
{
|
|
MemSet(BackendActivityBuffer, 0, size);
|
|
|
|
/* Initialize st_activity pointers. */
|
|
buffer = BackendActivityBuffer;
|
|
for (i = 0; i < MaxBackends; i++)
|
|
{
|
|
BackendStatusArray[i].st_activity = buffer;
|
|
buffer += pgstat_track_activity_query_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_initialize() -
|
|
*
|
|
* Initialize pgstats state, and set up our on-proc-exit hook.
|
|
* Called from InitPostgres. MyBackendId must be set,
|
|
* but we must not have started any transaction yet (since the
|
|
* exit hook must run after the last transaction exit).
|
|
* NOTE: MyDatabaseId isn't set yet; so the shutdown hook has to be careful.
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_initialize(void)
|
|
{
|
|
/* Initialize MyBEEntry */
|
|
Assert(MyBackendId >= 1 && MyBackendId <= MaxBackends);
|
|
MyBEEntry = &BackendStatusArray[MyBackendId - 1];
|
|
|
|
/* Set up a process-exit hook to clean up */
|
|
on_shmem_exit(pgstat_beshutdown_hook, 0);
|
|
}
|
|
|
|
/* ----------
|
|
* pgstat_bestart() -
|
|
*
|
|
* Initialize this backend's entry in the PgBackendStatus array.
|
|
* Called from InitPostgres. MyDatabaseId and session userid must be set
|
|
* (hence, this cannot be combined with pgstat_initialize).
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_bestart(void)
|
|
{
|
|
TimestampTz proc_start_timestamp;
|
|
Oid userid;
|
|
SockAddr clientaddr;
|
|
volatile PgBackendStatus *beentry;
|
|
|
|
/*
|
|
* To minimize the time spent modifying the PgBackendStatus entry, fetch
|
|
* all the needed data first.
|
|
*
|
|
* If we have a MyProcPort, use its session start time (for consistency,
|
|
* and to save a kernel call).
|
|
*/
|
|
if (MyProcPort)
|
|
proc_start_timestamp = MyProcPort->SessionStartTime;
|
|
else
|
|
proc_start_timestamp = GetCurrentTimestamp();
|
|
userid = GetSessionUserId();
|
|
|
|
/*
|
|
* We may not have a MyProcPort (eg, if this is the autovacuum process).
|
|
* If so, use all-zeroes client address, which is dealt with specially in
|
|
* pg_stat_get_backend_client_addr and pg_stat_get_backend_client_port.
|
|
*/
|
|
if (MyProcPort)
|
|
memcpy(&clientaddr, &MyProcPort->raddr, sizeof(clientaddr));
|
|
else
|
|
MemSet(&clientaddr, 0, sizeof(clientaddr));
|
|
|
|
/*
|
|
* Initialize my status entry, following the protocol of bumping
|
|
* st_changecount before and after; and make sure it's even afterwards. We
|
|
* use a volatile pointer here to ensure the compiler doesn't try to get
|
|
* cute.
|
|
*/
|
|
beentry = MyBEEntry;
|
|
do
|
|
{
|
|
beentry->st_changecount++;
|
|
} while ((beentry->st_changecount & 1) == 0);
|
|
|
|
beentry->st_procpid = MyProcPid;
|
|
beentry->st_proc_start_timestamp = proc_start_timestamp;
|
|
beentry->st_activity_start_timestamp = 0;
|
|
beentry->st_xact_start_timestamp = 0;
|
|
beentry->st_databaseid = MyDatabaseId;
|
|
beentry->st_userid = userid;
|
|
beentry->st_clientaddr = clientaddr;
|
|
beentry->st_waiting = false;
|
|
beentry->st_activity[0] = '\0';
|
|
/* Also make sure the last byte in the string area is always 0 */
|
|
beentry->st_activity[pgstat_track_activity_query_size - 1] = '\0';
|
|
|
|
beentry->st_changecount++;
|
|
Assert((beentry->st_changecount & 1) == 0);
|
|
}
|
|
|
|
/*
|
|
* Shut down a single backend's statistics reporting at process exit.
|
|
*
|
|
* Flush any remaining statistics counts out to the collector.
|
|
* Without this, operations triggered during backend exit (such as
|
|
* temp table deletions) won't be counted.
|
|
*
|
|
* Lastly, clear out our entry in the PgBackendStatus array.
|
|
*/
|
|
static void
|
|
pgstat_beshutdown_hook(int code, Datum arg)
|
|
{
|
|
volatile PgBackendStatus *beentry = MyBEEntry;
|
|
|
|
/*
|
|
* If we got as far as discovering our own database ID, we can report
|
|
* what we did to the collector. Otherwise, we'd be sending an invalid
|
|
* database ID, so forget it. (This means that accesses to pg_database
|
|
* during failed backend starts might never get counted.)
|
|
*/
|
|
if (OidIsValid(MyDatabaseId))
|
|
pgstat_report_stat(true);
|
|
|
|
/*
|
|
* Clear my status entry, following the protocol of bumping st_changecount
|
|
* before and after. We use a volatile pointer here to ensure the
|
|
* compiler doesn't try to get cute.
|
|
*/
|
|
beentry->st_changecount++;
|
|
|
|
beentry->st_procpid = 0; /* mark invalid */
|
|
|
|
beentry->st_changecount++;
|
|
Assert((beentry->st_changecount & 1) == 0);
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_report_activity() -
|
|
*
|
|
* Called from tcop/postgres.c to report what the backend is actually doing
|
|
* (usually "<IDLE>" or the start of the query to be executed).
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_report_activity(const char *cmd_str)
|
|
{
|
|
volatile PgBackendStatus *beentry = MyBEEntry;
|
|
TimestampTz start_timestamp;
|
|
int len;
|
|
|
|
TRACE_POSTGRESQL_STATEMENT_STATUS(cmd_str);
|
|
|
|
if (!pgstat_track_activities || !beentry)
|
|
return;
|
|
|
|
/*
|
|
* To minimize the time spent modifying the entry, fetch all the needed
|
|
* data first.
|
|
*/
|
|
start_timestamp = GetCurrentStatementStartTimestamp();
|
|
|
|
len = strlen(cmd_str);
|
|
len = pg_mbcliplen(cmd_str, len, pgstat_track_activity_query_size - 1);
|
|
|
|
/*
|
|
* Update my status entry, following the protocol of bumping
|
|
* st_changecount before and after. We use a volatile pointer here to
|
|
* ensure the compiler doesn't try to get cute.
|
|
*/
|
|
beentry->st_changecount++;
|
|
|
|
beentry->st_activity_start_timestamp = start_timestamp;
|
|
memcpy((char *) beentry->st_activity, cmd_str, len);
|
|
beentry->st_activity[len] = '\0';
|
|
|
|
beentry->st_changecount++;
|
|
Assert((beentry->st_changecount & 1) == 0);
|
|
}
|
|
|
|
/*
|
|
* Report current transaction start timestamp as the specified value.
|
|
* Zero means there is no active transaction.
|
|
*/
|
|
void
|
|
pgstat_report_xact_timestamp(TimestampTz tstamp)
|
|
{
|
|
volatile PgBackendStatus *beentry = MyBEEntry;
|
|
|
|
if (!pgstat_track_activities || !beentry)
|
|
return;
|
|
|
|
/*
|
|
* Update my status entry, following the protocol of bumping
|
|
* st_changecount before and after. We use a volatile pointer here to
|
|
* ensure the compiler doesn't try to get cute.
|
|
*/
|
|
beentry->st_changecount++;
|
|
beentry->st_xact_start_timestamp = tstamp;
|
|
beentry->st_changecount++;
|
|
Assert((beentry->st_changecount & 1) == 0);
|
|
}
|
|
|
|
/* ----------
|
|
* pgstat_report_waiting() -
|
|
*
|
|
* Called from lock manager to report beginning or end of a lock wait.
|
|
*
|
|
* NB: this *must* be able to survive being called before MyBEEntry has been
|
|
* initialized.
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_report_waiting(bool waiting)
|
|
{
|
|
volatile PgBackendStatus *beentry = MyBEEntry;
|
|
|
|
if (!pgstat_track_activities || !beentry)
|
|
return;
|
|
|
|
/*
|
|
* Since this is a single-byte field in a struct that only this process
|
|
* may modify, there seems no need to bother with the st_changecount
|
|
* protocol. The update must appear atomic in any case.
|
|
*/
|
|
beentry->st_waiting = waiting;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_read_current_status() -
|
|
*
|
|
* Copy the current contents of the PgBackendStatus array to local memory,
|
|
* if not already done in this transaction.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_read_current_status(void)
|
|
{
|
|
volatile PgBackendStatus *beentry;
|
|
PgBackendStatus *localtable;
|
|
PgBackendStatus *localentry;
|
|
char *localactivity;
|
|
int i;
|
|
|
|
Assert(!pgStatRunningInCollector);
|
|
if (localBackendStatusTable)
|
|
return; /* already done */
|
|
|
|
pgstat_setup_memcxt();
|
|
|
|
localtable = (PgBackendStatus *)
|
|
MemoryContextAlloc(pgStatLocalContext,
|
|
sizeof(PgBackendStatus) * MaxBackends);
|
|
localactivity = (char *)
|
|
MemoryContextAlloc(pgStatLocalContext,
|
|
pgstat_track_activity_query_size * MaxBackends);
|
|
localNumBackends = 0;
|
|
|
|
beentry = BackendStatusArray;
|
|
localentry = localtable;
|
|
for (i = 1; i <= MaxBackends; i++)
|
|
{
|
|
/*
|
|
* Follow the protocol of retrying if st_changecount changes while we
|
|
* copy the entry, or if it's odd. (The check for odd is needed to
|
|
* cover the case where we are able to completely copy the entry while
|
|
* the source backend is between increment steps.) We use a volatile
|
|
* pointer here to ensure the compiler doesn't try to get cute.
|
|
*/
|
|
for (;;)
|
|
{
|
|
int save_changecount = beentry->st_changecount;
|
|
|
|
localentry->st_procpid = beentry->st_procpid;
|
|
if (localentry->st_procpid > 0)
|
|
{
|
|
memcpy(localentry, (char *) beentry, sizeof(PgBackendStatus));
|
|
|
|
/*
|
|
* strcpy is safe even if the string is modified concurrently,
|
|
* because there's always a \0 at the end of the buffer.
|
|
*/
|
|
strcpy(localactivity, (char *) beentry->st_activity);
|
|
localentry->st_activity = localactivity;
|
|
}
|
|
|
|
if (save_changecount == beentry->st_changecount &&
|
|
(save_changecount & 1) == 0)
|
|
break;
|
|
|
|
/* Make sure we can break out of loop if stuck... */
|
|
CHECK_FOR_INTERRUPTS();
|
|
}
|
|
|
|
beentry++;
|
|
/* Only valid entries get included into the local array */
|
|
if (localentry->st_procpid > 0)
|
|
{
|
|
localentry++;
|
|
localactivity += pgstat_track_activity_query_size;
|
|
localNumBackends++;
|
|
}
|
|
}
|
|
|
|
/* Set the pointer only after completion of a valid table */
|
|
localBackendStatusTable = localtable;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_get_backend_current_activity() -
|
|
*
|
|
* Return a string representing the current activity of the backend with
|
|
* the specified PID. This looks directly at the BackendStatusArray,
|
|
* and so will provide current information regardless of the age of our
|
|
* transaction's snapshot of the status array.
|
|
*
|
|
* It is the caller's responsibility to invoke this only for backends whose
|
|
* state is expected to remain stable while the result is in use. The
|
|
* only current use is in deadlock reporting, where we can expect that
|
|
* the target backend is blocked on a lock. (There are corner cases
|
|
* where the target's wait could get aborted while we are looking at it,
|
|
* but the very worst consequence is to return a pointer to a string
|
|
* that's been changed, so we won't worry too much.)
|
|
*
|
|
* Note: return strings for special cases match pg_stat_get_backend_activity.
|
|
* ----------
|
|
*/
|
|
const char *
|
|
pgstat_get_backend_current_activity(int pid, bool checkUser)
|
|
{
|
|
PgBackendStatus *beentry;
|
|
int i;
|
|
|
|
beentry = BackendStatusArray;
|
|
for (i = 1; i <= MaxBackends; i++)
|
|
{
|
|
/*
|
|
* Although we expect the target backend's entry to be stable, that
|
|
* doesn't imply that anyone else's is. To avoid identifying the
|
|
* wrong backend, while we check for a match to the desired PID we
|
|
* must follow the protocol of retrying if st_changecount changes
|
|
* while we examine the entry, or if it's odd. (This might be
|
|
* unnecessary, since fetching or storing an int is almost certainly
|
|
* atomic, but let's play it safe.) We use a volatile pointer here to
|
|
* ensure the compiler doesn't try to get cute.
|
|
*/
|
|
volatile PgBackendStatus *vbeentry = beentry;
|
|
bool found;
|
|
|
|
for (;;)
|
|
{
|
|
int save_changecount = vbeentry->st_changecount;
|
|
|
|
found = (vbeentry->st_procpid == pid);
|
|
|
|
if (save_changecount == vbeentry->st_changecount &&
|
|
(save_changecount & 1) == 0)
|
|
break;
|
|
|
|
/* Make sure we can break out of loop if stuck... */
|
|
CHECK_FOR_INTERRUPTS();
|
|
}
|
|
|
|
if (found)
|
|
{
|
|
/* Now it is safe to use the non-volatile pointer */
|
|
if (checkUser && !superuser() && beentry->st_userid != GetUserId())
|
|
return "<insufficient privilege>";
|
|
else if (*(beentry->st_activity) == '\0')
|
|
return "<command string not enabled>";
|
|
else
|
|
return beentry->st_activity;
|
|
}
|
|
|
|
beentry++;
|
|
}
|
|
|
|
/* If we get here, caller is in error ... */
|
|
return "<backend information not available>";
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------
|
|
* Local support functions follow
|
|
* ------------------------------------------------------------
|
|
*/
|
|
|
|
|
|
/* ----------
|
|
* pgstat_setheader() -
|
|
*
|
|
* Set common header fields in a statistics message
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype)
|
|
{
|
|
hdr->m_type = mtype;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_send() -
|
|
*
|
|
* Send out one statistics message to the collector
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_send(void *msg, int len)
|
|
{
|
|
int rc;
|
|
|
|
if (pgStatSock < 0)
|
|
return;
|
|
|
|
((PgStat_MsgHdr *) msg)->m_size = len;
|
|
|
|
/* We'll retry after EINTR, but ignore all other failures */
|
|
do
|
|
{
|
|
rc = send(pgStatSock, msg, len, 0);
|
|
} while (rc < 0 && errno == EINTR);
|
|
|
|
#ifdef USE_ASSERT_CHECKING
|
|
/* In debug builds, log send failures ... */
|
|
if (rc < 0)
|
|
elog(LOG, "could not send to statistics collector: %m");
|
|
#endif
|
|
}
|
|
|
|
/* ----------
|
|
* pgstat_send_bgwriter() -
|
|
*
|
|
* Send bgwriter statistics to the collector
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_send_bgwriter(void)
|
|
{
|
|
/* We assume this initializes to zeroes */
|
|
static const PgStat_MsgBgWriter all_zeroes;
|
|
|
|
/*
|
|
* This function can be called even if nothing at all has happened. In
|
|
* this case, avoid sending a completely empty message to the stats
|
|
* collector.
|
|
*/
|
|
if (memcmp(&BgWriterStats, &all_zeroes, sizeof(PgStat_MsgBgWriter)) == 0)
|
|
return;
|
|
|
|
/*
|
|
* Prepare and send the message
|
|
*/
|
|
pgstat_setheader(&BgWriterStats.m_hdr, PGSTAT_MTYPE_BGWRITER);
|
|
pgstat_send(&BgWriterStats, sizeof(BgWriterStats));
|
|
|
|
/*
|
|
* Clear out the statistics buffer, so it can be re-used.
|
|
*/
|
|
MemSet(&BgWriterStats, 0, sizeof(BgWriterStats));
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* PgstatCollectorMain() -
|
|
*
|
|
* Start up the statistics collector process. This is the body of the
|
|
* postmaster child process.
|
|
*
|
|
* The argc/argv parameters are valid only in EXEC_BACKEND case.
|
|
* ----------
|
|
*/
|
|
NON_EXEC_STATIC void
|
|
PgstatCollectorMain(int argc, char *argv[])
|
|
{
|
|
int len;
|
|
PgStat_Msg msg;
|
|
|
|
#ifndef WIN32
|
|
#ifdef HAVE_POLL
|
|
struct pollfd input_fd;
|
|
#else
|
|
struct timeval sel_timeout;
|
|
fd_set rfds;
|
|
#endif
|
|
#endif
|
|
|
|
IsUnderPostmaster = true; /* we are a postmaster subprocess now */
|
|
|
|
MyProcPid = getpid(); /* reset MyProcPid */
|
|
|
|
MyStartTime = time(NULL); /* record Start Time for logging */
|
|
|
|
/*
|
|
* If possible, make this process a group leader, so that the postmaster
|
|
* can signal any child processes too. (pgstat probably never has any
|
|
* child processes, but for consistency we make all postmaster child
|
|
* processes do this.)
|
|
*/
|
|
#ifdef HAVE_SETSID
|
|
if (setsid() < 0)
|
|
elog(FATAL, "setsid() failed: %m");
|
|
#endif
|
|
|
|
/*
|
|
* Ignore all signals usually bound to some action in the postmaster,
|
|
* except SIGQUIT.
|
|
*/
|
|
pqsignal(SIGHUP, pgstat_sighup_handler);
|
|
pqsignal(SIGINT, SIG_IGN);
|
|
pqsignal(SIGTERM, SIG_IGN);
|
|
pqsignal(SIGQUIT, pgstat_exit);
|
|
pqsignal(SIGALRM, SIG_IGN);
|
|
pqsignal(SIGPIPE, SIG_IGN);
|
|
pqsignal(SIGUSR1, SIG_IGN);
|
|
pqsignal(SIGUSR2, SIG_IGN);
|
|
pqsignal(SIGCHLD, SIG_DFL);
|
|
pqsignal(SIGTTIN, SIG_DFL);
|
|
pqsignal(SIGTTOU, SIG_DFL);
|
|
pqsignal(SIGCONT, SIG_DFL);
|
|
pqsignal(SIGWINCH, SIG_DFL);
|
|
PG_SETMASK(&UnBlockSig);
|
|
|
|
/*
|
|
* Identify myself via ps
|
|
*/
|
|
init_ps_display("stats collector process", "", "", "");
|
|
|
|
/*
|
|
* Arrange to write the initial status file right away
|
|
*/
|
|
last_statrequest = GetCurrentTimestamp();
|
|
last_statwrite = last_statrequest - 1;
|
|
|
|
/*
|
|
* Read in an existing statistics stats file or initialize the stats to
|
|
* zero.
|
|
*/
|
|
pgStatRunningInCollector = true;
|
|
pgStatDBHash = pgstat_read_statsfile(InvalidOid, true);
|
|
|
|
/*
|
|
* Setup the descriptor set for select(2). Since only one bit in the set
|
|
* ever changes, we need not repeat FD_ZERO each time.
|
|
*/
|
|
#if !defined(HAVE_POLL) && !defined(WIN32)
|
|
FD_ZERO(&rfds);
|
|
#endif
|
|
|
|
/*
|
|
* Loop to process messages until we get SIGQUIT or detect ungraceful
|
|
* death of our parent postmaster.
|
|
*
|
|
* For performance reasons, we don't want to do a PostmasterIsAlive() test
|
|
* after every message; instead, do it only when select()/poll() is
|
|
* interrupted by timeout. In essence, we'll stay alive as long as
|
|
* backends keep sending us stuff often, even if the postmaster is gone.
|
|
*/
|
|
for (;;)
|
|
{
|
|
int got_data;
|
|
|
|
/*
|
|
* Quit if we get SIGQUIT from the postmaster.
|
|
*/
|
|
if (need_exit)
|
|
break;
|
|
|
|
/*
|
|
* Reload configuration if we got SIGHUP from the postmaster.
|
|
*/
|
|
if (got_SIGHUP)
|
|
{
|
|
ProcessConfigFile(PGC_SIGHUP);
|
|
got_SIGHUP = false;
|
|
}
|
|
|
|
/*
|
|
* Write the stats file if a new request has arrived that is not
|
|
* satisfied by existing file.
|
|
*/
|
|
if (last_statwrite < last_statrequest)
|
|
pgstat_write_statsfile(false);
|
|
|
|
/*
|
|
* Wait for a message to arrive; but not for more than
|
|
* PGSTAT_SELECT_TIMEOUT seconds. (This determines how quickly we will
|
|
* shut down after an ungraceful postmaster termination; so it needn't
|
|
* be very fast. However, on some systems SIGQUIT won't interrupt the
|
|
* poll/select call, so this also limits speed of response to SIGQUIT,
|
|
* which is more important.)
|
|
*
|
|
* We use poll(2) if available, otherwise select(2). Win32 has its own
|
|
* implementation.
|
|
*/
|
|
#ifndef WIN32
|
|
#ifdef HAVE_POLL
|
|
input_fd.fd = pgStatSock;
|
|
input_fd.events = POLLIN | POLLERR;
|
|
input_fd.revents = 0;
|
|
|
|
if (poll(&input_fd, 1, PGSTAT_SELECT_TIMEOUT * 1000) < 0)
|
|
{
|
|
if (errno == EINTR)
|
|
continue;
|
|
ereport(ERROR,
|
|
(errcode_for_socket_access(),
|
|
errmsg("poll() failed in statistics collector: %m")));
|
|
}
|
|
|
|
got_data = (input_fd.revents != 0);
|
|
#else /* !HAVE_POLL */
|
|
|
|
FD_SET (pgStatSock, &rfds);
|
|
|
|
/*
|
|
* timeout struct is modified by select() on some operating systems,
|
|
* so re-fill it each time.
|
|
*/
|
|
sel_timeout.tv_sec = PGSTAT_SELECT_TIMEOUT;
|
|
sel_timeout.tv_usec = 0;
|
|
|
|
if (select(pgStatSock + 1, &rfds, NULL, NULL, &sel_timeout) < 0)
|
|
{
|
|
if (errno == EINTR)
|
|
continue;
|
|
ereport(ERROR,
|
|
(errcode_for_socket_access(),
|
|
errmsg("select() failed in statistics collector: %m")));
|
|
}
|
|
|
|
got_data = FD_ISSET(pgStatSock, &rfds);
|
|
#endif /* HAVE_POLL */
|
|
#else /* WIN32 */
|
|
got_data = pgwin32_waitforsinglesocket(pgStatSock, FD_READ,
|
|
PGSTAT_SELECT_TIMEOUT * 1000);
|
|
#endif
|
|
|
|
/*
|
|
* If there is a message on the socket, read it and check for
|
|
* validity.
|
|
*/
|
|
if (got_data)
|
|
{
|
|
len = recv(pgStatSock, (char *) &msg,
|
|
sizeof(PgStat_Msg), 0);
|
|
if (len < 0)
|
|
{
|
|
if (errno == EINTR)
|
|
continue;
|
|
ereport(ERROR,
|
|
(errcode_for_socket_access(),
|
|
errmsg("could not read statistics message: %m")));
|
|
}
|
|
|
|
/*
|
|
* We ignore messages that are smaller than our common header
|
|
*/
|
|
if (len < sizeof(PgStat_MsgHdr))
|
|
continue;
|
|
|
|
/*
|
|
* The received length must match the length in the header
|
|
*/
|
|
if (msg.msg_hdr.m_size != len)
|
|
continue;
|
|
|
|
/*
|
|
* O.K. - we accept this message. Process it.
|
|
*/
|
|
switch (msg.msg_hdr.m_type)
|
|
{
|
|
case PGSTAT_MTYPE_DUMMY:
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_INQUIRY:
|
|
pgstat_recv_inquiry((PgStat_MsgInquiry *) &msg, len);
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_TABSTAT:
|
|
pgstat_recv_tabstat((PgStat_MsgTabstat *) &msg, len);
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_TABPURGE:
|
|
pgstat_recv_tabpurge((PgStat_MsgTabpurge *) &msg, len);
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_DROPDB:
|
|
pgstat_recv_dropdb((PgStat_MsgDropdb *) &msg, len);
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_RESETCOUNTER:
|
|
pgstat_recv_resetcounter((PgStat_MsgResetcounter *) &msg,
|
|
len);
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_AUTOVAC_START:
|
|
pgstat_recv_autovac((PgStat_MsgAutovacStart *) &msg, len);
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_VACUUM:
|
|
pgstat_recv_vacuum((PgStat_MsgVacuum *) &msg, len);
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_ANALYZE:
|
|
pgstat_recv_analyze((PgStat_MsgAnalyze *) &msg, len);
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_BGWRITER:
|
|
pgstat_recv_bgwriter((PgStat_MsgBgWriter *) &msg, len);
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_FUNCSTAT:
|
|
pgstat_recv_funcstat((PgStat_MsgFuncstat *) &msg, len);
|
|
break;
|
|
|
|
case PGSTAT_MTYPE_FUNCPURGE:
|
|
pgstat_recv_funcpurge((PgStat_MsgFuncpurge *) &msg, len);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* We can only get here if the select/poll timeout elapsed. Check
|
|
* for postmaster death.
|
|
*/
|
|
if (!PostmasterIsAlive(true))
|
|
break;
|
|
}
|
|
} /* end of message-processing loop */
|
|
|
|
/*
|
|
* Save the final stats to reuse at next startup.
|
|
*/
|
|
pgstat_write_statsfile(true);
|
|
|
|
exit(0);
|
|
}
|
|
|
|
|
|
/* SIGQUIT signal handler for collector process */
|
|
static void
|
|
pgstat_exit(SIGNAL_ARGS)
|
|
{
|
|
need_exit = true;
|
|
}
|
|
|
|
/* SIGHUP handler for collector process */
|
|
static void
|
|
pgstat_sighup_handler(SIGNAL_ARGS)
|
|
{
|
|
got_SIGHUP = true;
|
|
}
|
|
|
|
|
|
/*
|
|
* Lookup the hash table entry for the specified database. If no hash
|
|
* table entry exists, initialize it, if the create parameter is true.
|
|
* Else, return NULL.
|
|
*/
|
|
static PgStat_StatDBEntry *
|
|
pgstat_get_db_entry(Oid databaseid, bool create)
|
|
{
|
|
PgStat_StatDBEntry *result;
|
|
bool found;
|
|
HASHACTION action = (create ? HASH_ENTER : HASH_FIND);
|
|
|
|
/* Lookup or create the hash table entry for this database */
|
|
result = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
|
|
&databaseid,
|
|
action, &found);
|
|
|
|
if (!create && !found)
|
|
return NULL;
|
|
|
|
/* If not found, initialize the new one. */
|
|
if (!found)
|
|
{
|
|
HASHCTL hash_ctl;
|
|
|
|
result->tables = NULL;
|
|
result->functions = NULL;
|
|
result->n_xact_commit = 0;
|
|
result->n_xact_rollback = 0;
|
|
result->n_blocks_fetched = 0;
|
|
result->n_blocks_hit = 0;
|
|
result->n_tuples_returned = 0;
|
|
result->n_tuples_fetched = 0;
|
|
result->n_tuples_inserted = 0;
|
|
result->n_tuples_updated = 0;
|
|
result->n_tuples_deleted = 0;
|
|
result->last_autovac_time = 0;
|
|
|
|
memset(&hash_ctl, 0, sizeof(hash_ctl));
|
|
hash_ctl.keysize = sizeof(Oid);
|
|
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
|
|
hash_ctl.hash = oid_hash;
|
|
result->tables = hash_create("Per-database table",
|
|
PGSTAT_TAB_HASH_SIZE,
|
|
&hash_ctl,
|
|
HASH_ELEM | HASH_FUNCTION);
|
|
|
|
hash_ctl.keysize = sizeof(Oid);
|
|
hash_ctl.entrysize = sizeof(PgStat_StatFuncEntry);
|
|
hash_ctl.hash = oid_hash;
|
|
result->functions = hash_create("Per-database function",
|
|
PGSTAT_FUNCTION_HASH_SIZE,
|
|
&hash_ctl,
|
|
HASH_ELEM | HASH_FUNCTION);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/*
|
|
* Lookup the hash table entry for the specified table. If no hash
|
|
* table entry exists, initialize it, if the create parameter is true.
|
|
* Else, return NULL.
|
|
*/
|
|
static PgStat_StatTabEntry *
|
|
pgstat_get_tab_entry(PgStat_StatDBEntry *dbentry, Oid tableoid, bool create)
|
|
{
|
|
PgStat_StatTabEntry *result;
|
|
bool found;
|
|
HASHACTION action = (create ? HASH_ENTER : HASH_FIND);
|
|
|
|
/* Lookup or create the hash table entry for this table */
|
|
result = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
|
|
&tableoid,
|
|
action, &found);
|
|
|
|
if (!create && !found)
|
|
return NULL;
|
|
|
|
/* If not found, initialize the new one. */
|
|
if (!found)
|
|
{
|
|
result->numscans = 0;
|
|
result->tuples_returned = 0;
|
|
result->tuples_fetched = 0;
|
|
result->tuples_inserted = 0;
|
|
result->tuples_updated = 0;
|
|
result->tuples_deleted = 0;
|
|
result->tuples_hot_updated = 0;
|
|
result->n_live_tuples = 0;
|
|
result->n_dead_tuples = 0;
|
|
result->last_anl_tuples = 0;
|
|
result->blocks_fetched = 0;
|
|
result->blocks_hit = 0;
|
|
|
|
result->vacuum_timestamp = 0;
|
|
result->autovac_vacuum_timestamp = 0;
|
|
result->analyze_timestamp = 0;
|
|
result->autovac_analyze_timestamp = 0;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_write_statsfile() -
|
|
*
|
|
* Tell the news.
|
|
* If writing to the permanent file (happens when the collector is
|
|
* shutting down only), remove the temporary file so that backends
|
|
* starting up under a new postmaster can't read the old data before
|
|
* the new collector is ready.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_write_statsfile(bool permanent)
|
|
{
|
|
HASH_SEQ_STATUS hstat;
|
|
HASH_SEQ_STATUS tstat;
|
|
HASH_SEQ_STATUS fstat;
|
|
PgStat_StatDBEntry *dbentry;
|
|
PgStat_StatTabEntry *tabentry;
|
|
PgStat_StatFuncEntry *funcentry;
|
|
FILE *fpout;
|
|
int32 format_id;
|
|
const char *tmpfile = permanent ? PGSTAT_STAT_PERMANENT_TMPFILE : pgstat_stat_tmpname;
|
|
const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
|
|
|
|
/*
|
|
* Open the statistics temp file to write out the current values.
|
|
*/
|
|
fpout = AllocateFile(tmpfile, PG_BINARY_W);
|
|
if (fpout == NULL)
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not open temporary statistics file \"%s\": %m",
|
|
tmpfile)));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Set the timestamp of the stats file.
|
|
*/
|
|
globalStats.stats_timestamp = GetCurrentTimestamp();
|
|
|
|
/*
|
|
* Write the file header --- currently just a format ID.
|
|
*/
|
|
format_id = PGSTAT_FILE_FORMAT_ID;
|
|
fwrite(&format_id, sizeof(format_id), 1, fpout);
|
|
|
|
/*
|
|
* Write global stats struct
|
|
*/
|
|
fwrite(&globalStats, sizeof(globalStats), 1, fpout);
|
|
|
|
/*
|
|
* Walk through the database table.
|
|
*/
|
|
hash_seq_init(&hstat, pgStatDBHash);
|
|
while ((dbentry = (PgStat_StatDBEntry *) hash_seq_search(&hstat)) != NULL)
|
|
{
|
|
/*
|
|
* Write out the DB entry including the number of live backends. We
|
|
* don't write the tables or functions pointers, since they're of no
|
|
* use to any other process.
|
|
*/
|
|
fputc('D', fpout);
|
|
fwrite(dbentry, offsetof(PgStat_StatDBEntry, tables), 1, fpout);
|
|
|
|
/*
|
|
* Walk through the database's access stats per table.
|
|
*/
|
|
hash_seq_init(&tstat, dbentry->tables);
|
|
while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&tstat)) != NULL)
|
|
{
|
|
fputc('T', fpout);
|
|
fwrite(tabentry, sizeof(PgStat_StatTabEntry), 1, fpout);
|
|
}
|
|
|
|
/*
|
|
* Walk through the database's function stats table.
|
|
*/
|
|
hash_seq_init(&fstat, dbentry->functions);
|
|
while ((funcentry = (PgStat_StatFuncEntry *) hash_seq_search(&fstat)) != NULL)
|
|
{
|
|
fputc('F', fpout);
|
|
fwrite(funcentry, sizeof(PgStat_StatFuncEntry), 1, fpout);
|
|
}
|
|
|
|
/*
|
|
* Mark the end of this DB
|
|
*/
|
|
fputc('d', fpout);
|
|
}
|
|
|
|
/*
|
|
* No more output to be done. Close the temp file and replace the old
|
|
* pgstat.stat with it. The ferror() check replaces testing for error
|
|
* after each individual fputc or fwrite above.
|
|
*/
|
|
fputc('E', fpout);
|
|
|
|
if (ferror(fpout))
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not write temporary statistics file \"%s\": %m",
|
|
tmpfile)));
|
|
FreeFile(fpout);
|
|
unlink(tmpfile);
|
|
}
|
|
else if (FreeFile(fpout) < 0)
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not close temporary statistics file \"%s\": %m",
|
|
tmpfile)));
|
|
unlink(tmpfile);
|
|
}
|
|
else if (rename(tmpfile, statfile) < 0)
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not rename temporary statistics file \"%s\" to \"%s\": %m",
|
|
tmpfile, statfile)));
|
|
unlink(tmpfile);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Successful write, so update last_statwrite.
|
|
*/
|
|
last_statwrite = globalStats.stats_timestamp;
|
|
|
|
/*
|
|
* It's not entirely clear whether there could be clock skew between
|
|
* backends and the collector; but just in case someone manages to
|
|
* send us a stats request time that's far in the future, reset it.
|
|
* This ensures that no inquiry message can cause more than one stats
|
|
* file write to occur.
|
|
*/
|
|
last_statrequest = last_statwrite;
|
|
}
|
|
|
|
if (permanent)
|
|
unlink(pgstat_stat_filename);
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_read_statsfile() -
|
|
*
|
|
* Reads in an existing statistics collector file and initializes the
|
|
* databases' hash table (whose entries point to the tables' hash tables).
|
|
* ----------
|
|
*/
|
|
static HTAB *
|
|
pgstat_read_statsfile(Oid onlydb, bool permanent)
|
|
{
|
|
PgStat_StatDBEntry *dbentry;
|
|
PgStat_StatDBEntry dbbuf;
|
|
PgStat_StatTabEntry *tabentry;
|
|
PgStat_StatTabEntry tabbuf;
|
|
PgStat_StatFuncEntry funcbuf;
|
|
PgStat_StatFuncEntry *funcentry;
|
|
HASHCTL hash_ctl;
|
|
HTAB *dbhash;
|
|
HTAB *tabhash = NULL;
|
|
HTAB *funchash = NULL;
|
|
FILE *fpin;
|
|
int32 format_id;
|
|
bool found;
|
|
const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
|
|
|
|
/*
|
|
* The tables will live in pgStatLocalContext.
|
|
*/
|
|
pgstat_setup_memcxt();
|
|
|
|
/*
|
|
* Create the DB hashtable
|
|
*/
|
|
memset(&hash_ctl, 0, sizeof(hash_ctl));
|
|
hash_ctl.keysize = sizeof(Oid);
|
|
hash_ctl.entrysize = sizeof(PgStat_StatDBEntry);
|
|
hash_ctl.hash = oid_hash;
|
|
hash_ctl.hcxt = pgStatLocalContext;
|
|
dbhash = hash_create("Databases hash", PGSTAT_DB_HASH_SIZE, &hash_ctl,
|
|
HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
|
|
|
|
/*
|
|
* Clear out global statistics so they start from zero in case we can't
|
|
* load an existing statsfile.
|
|
*/
|
|
memset(&globalStats, 0, sizeof(globalStats));
|
|
|
|
/*
|
|
* Try to open the status file. If it doesn't exist, the backends simply
|
|
* return zero for anything and the collector simply starts from scratch
|
|
* with empty counters.
|
|
*/
|
|
if ((fpin = AllocateFile(statfile, PG_BINARY_R)) == NULL)
|
|
return dbhash;
|
|
|
|
/*
|
|
* Verify it's of the expected format.
|
|
*/
|
|
if (fread(&format_id, 1, sizeof(format_id), fpin) != sizeof(format_id)
|
|
|| format_id != PGSTAT_FILE_FORMAT_ID)
|
|
{
|
|
ereport(pgStatRunningInCollector ? LOG : WARNING,
|
|
(errmsg("corrupted pgstat.stat file")));
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Read global stats struct
|
|
*/
|
|
if (fread(&globalStats, 1, sizeof(globalStats), fpin) != sizeof(globalStats))
|
|
{
|
|
ereport(pgStatRunningInCollector ? LOG : WARNING,
|
|
(errmsg("corrupted pgstat.stat file")));
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* We found an existing collector stats file. Read it and put all the
|
|
* hashtable entries into place.
|
|
*/
|
|
for (;;)
|
|
{
|
|
switch (fgetc(fpin))
|
|
{
|
|
/*
|
|
* 'D' A PgStat_StatDBEntry struct describing a database
|
|
* follows. Subsequently, zero to many 'T' and 'F' entries
|
|
* will follow until a 'd' is encountered.
|
|
*/
|
|
case 'D':
|
|
if (fread(&dbbuf, 1, offsetof(PgStat_StatDBEntry, tables),
|
|
fpin) != offsetof(PgStat_StatDBEntry, tables))
|
|
{
|
|
ereport(pgStatRunningInCollector ? LOG : WARNING,
|
|
(errmsg("corrupted pgstat.stat file")));
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Add to the DB hash
|
|
*/
|
|
dbentry = (PgStat_StatDBEntry *) hash_search(dbhash,
|
|
(void *) &dbbuf.databaseid,
|
|
HASH_ENTER,
|
|
&found);
|
|
if (found)
|
|
{
|
|
ereport(pgStatRunningInCollector ? LOG : WARNING,
|
|
(errmsg("corrupted pgstat.stat file")));
|
|
goto done;
|
|
}
|
|
|
|
memcpy(dbentry, &dbbuf, sizeof(PgStat_StatDBEntry));
|
|
dbentry->tables = NULL;
|
|
dbentry->functions = NULL;
|
|
|
|
/*
|
|
* Don't collect tables if not the requested DB (or the
|
|
* shared-table info)
|
|
*/
|
|
if (onlydb != InvalidOid)
|
|
{
|
|
if (dbbuf.databaseid != onlydb &&
|
|
dbbuf.databaseid != InvalidOid)
|
|
break;
|
|
}
|
|
|
|
memset(&hash_ctl, 0, sizeof(hash_ctl));
|
|
hash_ctl.keysize = sizeof(Oid);
|
|
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
|
|
hash_ctl.hash = oid_hash;
|
|
hash_ctl.hcxt = pgStatLocalContext;
|
|
dbentry->tables = hash_create("Per-database table",
|
|
PGSTAT_TAB_HASH_SIZE,
|
|
&hash_ctl,
|
|
HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
|
|
|
|
hash_ctl.keysize = sizeof(Oid);
|
|
hash_ctl.entrysize = sizeof(PgStat_StatFuncEntry);
|
|
hash_ctl.hash = oid_hash;
|
|
hash_ctl.hcxt = pgStatLocalContext;
|
|
dbentry->functions = hash_create("Per-database function",
|
|
PGSTAT_FUNCTION_HASH_SIZE,
|
|
&hash_ctl,
|
|
HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
|
|
|
|
/*
|
|
* Arrange that following records add entries to this
|
|
* database's hash tables.
|
|
*/
|
|
tabhash = dbentry->tables;
|
|
funchash = dbentry->functions;
|
|
break;
|
|
|
|
/*
|
|
* 'd' End of this database.
|
|
*/
|
|
case 'd':
|
|
tabhash = NULL;
|
|
funchash = NULL;
|
|
break;
|
|
|
|
/*
|
|
* 'T' A PgStat_StatTabEntry follows.
|
|
*/
|
|
case 'T':
|
|
if (fread(&tabbuf, 1, sizeof(PgStat_StatTabEntry),
|
|
fpin) != sizeof(PgStat_StatTabEntry))
|
|
{
|
|
ereport(pgStatRunningInCollector ? LOG : WARNING,
|
|
(errmsg("corrupted pgstat.stat file")));
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Skip if table belongs to a not requested database.
|
|
*/
|
|
if (tabhash == NULL)
|
|
break;
|
|
|
|
tabentry = (PgStat_StatTabEntry *) hash_search(tabhash,
|
|
(void *) &tabbuf.tableid,
|
|
HASH_ENTER, &found);
|
|
|
|
if (found)
|
|
{
|
|
ereport(pgStatRunningInCollector ? LOG : WARNING,
|
|
(errmsg("corrupted pgstat.stat file")));
|
|
goto done;
|
|
}
|
|
|
|
memcpy(tabentry, &tabbuf, sizeof(tabbuf));
|
|
break;
|
|
|
|
/*
|
|
* 'F' A PgStat_StatFuncEntry follows.
|
|
*/
|
|
case 'F':
|
|
if (fread(&funcbuf, 1, sizeof(PgStat_StatFuncEntry),
|
|
fpin) != sizeof(PgStat_StatFuncEntry))
|
|
{
|
|
ereport(pgStatRunningInCollector ? LOG : WARNING,
|
|
(errmsg("corrupted pgstat.stat file")));
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Skip if function belongs to a not requested database.
|
|
*/
|
|
if (funchash == NULL)
|
|
break;
|
|
|
|
funcentry = (PgStat_StatFuncEntry *) hash_search(funchash,
|
|
(void *) &funcbuf.functionid,
|
|
HASH_ENTER, &found);
|
|
|
|
if (found)
|
|
{
|
|
ereport(pgStatRunningInCollector ? LOG : WARNING,
|
|
(errmsg("corrupted pgstat.stat file")));
|
|
goto done;
|
|
}
|
|
|
|
memcpy(funcentry, &funcbuf, sizeof(funcbuf));
|
|
break;
|
|
|
|
/*
|
|
* 'E' The EOF marker of a complete stats file.
|
|
*/
|
|
case 'E':
|
|
goto done;
|
|
|
|
default:
|
|
ereport(pgStatRunningInCollector ? LOG : WARNING,
|
|
(errmsg("corrupted pgstat.stat file")));
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
FreeFile(fpin);
|
|
|
|
if (permanent)
|
|
unlink(PGSTAT_STAT_PERMANENT_FILENAME);
|
|
|
|
return dbhash;
|
|
}
|
|
|
|
/* ----------
|
|
* pgstat_read_statsfile_timestamp() -
|
|
*
|
|
* Attempt to fetch the timestamp of an existing stats file.
|
|
* Returns TRUE if successful (timestamp is stored at *ts).
|
|
* ----------
|
|
*/
|
|
static bool
|
|
pgstat_read_statsfile_timestamp(bool permanent, TimestampTz *ts)
|
|
{
|
|
PgStat_GlobalStats myGlobalStats;
|
|
FILE *fpin;
|
|
int32 format_id;
|
|
const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
|
|
|
|
/*
|
|
* Try to open the status file.
|
|
*/
|
|
if ((fpin = AllocateFile(statfile, PG_BINARY_R)) == NULL)
|
|
return false;
|
|
|
|
/*
|
|
* Verify it's of the expected format.
|
|
*/
|
|
if (fread(&format_id, 1, sizeof(format_id), fpin) != sizeof(format_id)
|
|
|| format_id != PGSTAT_FILE_FORMAT_ID)
|
|
{
|
|
FreeFile(fpin);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Read global stats struct
|
|
*/
|
|
if (fread(&myGlobalStats, 1, sizeof(myGlobalStats), fpin) != sizeof(myGlobalStats))
|
|
{
|
|
FreeFile(fpin);
|
|
return false;
|
|
}
|
|
|
|
*ts = myGlobalStats.stats_timestamp;
|
|
|
|
FreeFile(fpin);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* If not already done, read the statistics collector stats file into
|
|
* some hash tables. The results will be kept until pgstat_clear_snapshot()
|
|
* is called (typically, at end of transaction).
|
|
*/
|
|
static void
|
|
backend_read_statsfile(void)
|
|
{
|
|
TimestampTz min_ts;
|
|
int count;
|
|
|
|
/* already read it? */
|
|
if (pgStatDBHash)
|
|
return;
|
|
Assert(!pgStatRunningInCollector);
|
|
|
|
/*
|
|
* We set the minimum acceptable timestamp to PGSTAT_STAT_INTERVAL msec
|
|
* before now. This indirectly ensures that the collector needn't write
|
|
* the file more often than PGSTAT_STAT_INTERVAL. In an autovacuum
|
|
* worker, however, we want a lower delay to avoid using stale data, so we
|
|
* use PGSTAT_RETRY_DELAY (since the number of worker is low, this
|
|
* shouldn't be a problem).
|
|
*
|
|
* Note that we don't recompute min_ts after sleeping; so we might end up
|
|
* accepting a file a bit older than PGSTAT_STAT_INTERVAL. In practice
|
|
* that shouldn't happen, though, as long as the sleep time is less than
|
|
* PGSTAT_STAT_INTERVAL; and we don't want to lie to the collector about
|
|
* what our cutoff time really is.
|
|
*/
|
|
if (IsAutoVacuumWorkerProcess())
|
|
min_ts = TimestampTzPlusMilliseconds(GetCurrentTimestamp(),
|
|
-PGSTAT_RETRY_DELAY);
|
|
else
|
|
min_ts = TimestampTzPlusMilliseconds(GetCurrentTimestamp(),
|
|
-PGSTAT_STAT_INTERVAL);
|
|
|
|
/*
|
|
* Loop until fresh enough stats file is available or we ran out of time.
|
|
* The stats inquiry message is sent repeatedly in case collector drops
|
|
* it.
|
|
*/
|
|
for (count = 0; count < PGSTAT_POLL_LOOP_COUNT; count++)
|
|
{
|
|
TimestampTz file_ts = 0;
|
|
|
|
CHECK_FOR_INTERRUPTS();
|
|
|
|
if (pgstat_read_statsfile_timestamp(false, &file_ts) &&
|
|
file_ts >= min_ts)
|
|
break;
|
|
|
|
/* Not there or too old, so kick the collector and wait a bit */
|
|
pgstat_send_inquiry(min_ts);
|
|
pg_usleep(PGSTAT_RETRY_DELAY * 1000L);
|
|
}
|
|
|
|
if (count >= PGSTAT_POLL_LOOP_COUNT)
|
|
elog(WARNING, "pgstat wait timeout");
|
|
|
|
/* Autovacuum launcher wants stats about all databases */
|
|
if (IsAutoVacuumLauncherProcess())
|
|
pgStatDBHash = pgstat_read_statsfile(InvalidOid, false);
|
|
else
|
|
pgStatDBHash = pgstat_read_statsfile(MyDatabaseId, false);
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_setup_memcxt() -
|
|
*
|
|
* Create pgStatLocalContext, if not already done.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_setup_memcxt(void)
|
|
{
|
|
if (!pgStatLocalContext)
|
|
pgStatLocalContext = AllocSetContextCreate(TopMemoryContext,
|
|
"Statistics snapshot",
|
|
ALLOCSET_SMALL_MINSIZE,
|
|
ALLOCSET_SMALL_INITSIZE,
|
|
ALLOCSET_SMALL_MAXSIZE);
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_clear_snapshot() -
|
|
*
|
|
* Discard any data collected in the current transaction. Any subsequent
|
|
* request will cause new snapshots to be read.
|
|
*
|
|
* This is also invoked during transaction commit or abort to discard
|
|
* the no-longer-wanted snapshot.
|
|
* ----------
|
|
*/
|
|
void
|
|
pgstat_clear_snapshot(void)
|
|
{
|
|
/* Release memory, if any was allocated */
|
|
if (pgStatLocalContext)
|
|
MemoryContextDelete(pgStatLocalContext);
|
|
|
|
/* Reset variables */
|
|
pgStatLocalContext = NULL;
|
|
pgStatDBHash = NULL;
|
|
localBackendStatusTable = NULL;
|
|
localNumBackends = 0;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_recv_inquiry() -
|
|
*
|
|
* Process stat inquiry requests.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_inquiry(PgStat_MsgInquiry *msg, int len)
|
|
{
|
|
if (msg->inquiry_time > last_statrequest)
|
|
last_statrequest = msg->inquiry_time;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_recv_tabstat() -
|
|
*
|
|
* Count what the backend has done.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len)
|
|
{
|
|
PgStat_TableEntry *tabmsg = &(msg->m_entry[0]);
|
|
PgStat_StatDBEntry *dbentry;
|
|
PgStat_StatTabEntry *tabentry;
|
|
int i;
|
|
bool found;
|
|
|
|
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
|
|
|
|
/*
|
|
* Update database-wide stats.
|
|
*/
|
|
dbentry->n_xact_commit += (PgStat_Counter) (msg->m_xact_commit);
|
|
dbentry->n_xact_rollback += (PgStat_Counter) (msg->m_xact_rollback);
|
|
|
|
/*
|
|
* Process all table entries in the message.
|
|
*/
|
|
for (i = 0; i < msg->m_nentries; i++)
|
|
{
|
|
tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
|
|
(void *) &(tabmsg[i].t_id),
|
|
HASH_ENTER, &found);
|
|
|
|
if (!found)
|
|
{
|
|
/*
|
|
* If it's a new table entry, initialize counters to the values we
|
|
* just got.
|
|
*/
|
|
tabentry->numscans = tabmsg[i].t_counts.t_numscans;
|
|
tabentry->tuples_returned = tabmsg[i].t_counts.t_tuples_returned;
|
|
tabentry->tuples_fetched = tabmsg[i].t_counts.t_tuples_fetched;
|
|
tabentry->tuples_inserted = tabmsg[i].t_counts.t_tuples_inserted;
|
|
tabentry->tuples_updated = tabmsg[i].t_counts.t_tuples_updated;
|
|
tabentry->tuples_deleted = tabmsg[i].t_counts.t_tuples_deleted;
|
|
tabentry->tuples_hot_updated = tabmsg[i].t_counts.t_tuples_hot_updated;
|
|
tabentry->n_live_tuples = tabmsg[i].t_counts.t_new_live_tuples;
|
|
tabentry->n_dead_tuples = tabmsg[i].t_counts.t_new_dead_tuples;
|
|
tabentry->last_anl_tuples = 0;
|
|
tabentry->blocks_fetched = tabmsg[i].t_counts.t_blocks_fetched;
|
|
tabentry->blocks_hit = tabmsg[i].t_counts.t_blocks_hit;
|
|
|
|
tabentry->vacuum_timestamp = 0;
|
|
tabentry->autovac_vacuum_timestamp = 0;
|
|
tabentry->analyze_timestamp = 0;
|
|
tabentry->autovac_analyze_timestamp = 0;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Otherwise add the values to the existing entry.
|
|
*/
|
|
tabentry->numscans += tabmsg[i].t_counts.t_numscans;
|
|
tabentry->tuples_returned += tabmsg[i].t_counts.t_tuples_returned;
|
|
tabentry->tuples_fetched += tabmsg[i].t_counts.t_tuples_fetched;
|
|
tabentry->tuples_inserted += tabmsg[i].t_counts.t_tuples_inserted;
|
|
tabentry->tuples_updated += tabmsg[i].t_counts.t_tuples_updated;
|
|
tabentry->tuples_deleted += tabmsg[i].t_counts.t_tuples_deleted;
|
|
tabentry->tuples_hot_updated += tabmsg[i].t_counts.t_tuples_hot_updated;
|
|
tabentry->n_live_tuples += tabmsg[i].t_counts.t_new_live_tuples;
|
|
tabentry->n_dead_tuples += tabmsg[i].t_counts.t_new_dead_tuples;
|
|
tabentry->blocks_fetched += tabmsg[i].t_counts.t_blocks_fetched;
|
|
tabentry->blocks_hit += tabmsg[i].t_counts.t_blocks_hit;
|
|
}
|
|
|
|
/* Clamp n_live_tuples in case of negative new_live_tuples */
|
|
tabentry->n_live_tuples = Max(tabentry->n_live_tuples, 0);
|
|
/* Likewise for n_dead_tuples */
|
|
tabentry->n_dead_tuples = Max(tabentry->n_dead_tuples, 0);
|
|
|
|
/*
|
|
* Add per-table stats to the per-database entry, too.
|
|
*/
|
|
dbentry->n_tuples_returned += tabmsg[i].t_counts.t_tuples_returned;
|
|
dbentry->n_tuples_fetched += tabmsg[i].t_counts.t_tuples_fetched;
|
|
dbentry->n_tuples_inserted += tabmsg[i].t_counts.t_tuples_inserted;
|
|
dbentry->n_tuples_updated += tabmsg[i].t_counts.t_tuples_updated;
|
|
dbentry->n_tuples_deleted += tabmsg[i].t_counts.t_tuples_deleted;
|
|
dbentry->n_blocks_fetched += tabmsg[i].t_counts.t_blocks_fetched;
|
|
dbentry->n_blocks_hit += tabmsg[i].t_counts.t_blocks_hit;
|
|
}
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_recv_tabpurge() -
|
|
*
|
|
* Arrange for dead table removal.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len)
|
|
{
|
|
PgStat_StatDBEntry *dbentry;
|
|
int i;
|
|
|
|
dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
|
|
|
|
/*
|
|
* No need to purge if we don't even know the database.
|
|
*/
|
|
if (!dbentry || !dbentry->tables)
|
|
return;
|
|
|
|
/*
|
|
* Process all table entries in the message.
|
|
*/
|
|
for (i = 0; i < msg->m_nentries; i++)
|
|
{
|
|
/* Remove from hashtable if present; we don't care if it's not. */
|
|
(void) hash_search(dbentry->tables,
|
|
(void *) &(msg->m_tableid[i]),
|
|
HASH_REMOVE, NULL);
|
|
}
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_recv_dropdb() -
|
|
*
|
|
* Arrange for dead database removal
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_dropdb(PgStat_MsgDropdb *msg, int len)
|
|
{
|
|
PgStat_StatDBEntry *dbentry;
|
|
|
|
/*
|
|
* Lookup the database in the hashtable.
|
|
*/
|
|
dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
|
|
|
|
/*
|
|
* If found, remove it.
|
|
*/
|
|
if (dbentry)
|
|
{
|
|
if (dbentry->tables != NULL)
|
|
hash_destroy(dbentry->tables);
|
|
if (dbentry->functions != NULL)
|
|
hash_destroy(dbentry->functions);
|
|
|
|
if (hash_search(pgStatDBHash,
|
|
(void *) &(dbentry->databaseid),
|
|
HASH_REMOVE, NULL) == NULL)
|
|
ereport(ERROR,
|
|
(errmsg("database hash table corrupted "
|
|
"during cleanup --- abort")));
|
|
}
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_recv_resetcounter() -
|
|
*
|
|
* Reset the statistics for the specified database.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len)
|
|
{
|
|
HASHCTL hash_ctl;
|
|
PgStat_StatDBEntry *dbentry;
|
|
|
|
/*
|
|
* Lookup the database in the hashtable. Nothing to do if not there.
|
|
*/
|
|
dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
|
|
|
|
if (!dbentry)
|
|
return;
|
|
|
|
/*
|
|
* We simply throw away all the database's table entries by recreating a
|
|
* new hash table for them.
|
|
*/
|
|
if (dbentry->tables != NULL)
|
|
hash_destroy(dbentry->tables);
|
|
if (dbentry->functions != NULL)
|
|
hash_destroy(dbentry->functions);
|
|
|
|
dbentry->tables = NULL;
|
|
dbentry->functions = NULL;
|
|
dbentry->n_xact_commit = 0;
|
|
dbentry->n_xact_rollback = 0;
|
|
dbentry->n_blocks_fetched = 0;
|
|
dbentry->n_blocks_hit = 0;
|
|
|
|
memset(&hash_ctl, 0, sizeof(hash_ctl));
|
|
hash_ctl.keysize = sizeof(Oid);
|
|
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
|
|
hash_ctl.hash = oid_hash;
|
|
dbentry->tables = hash_create("Per-database table",
|
|
PGSTAT_TAB_HASH_SIZE,
|
|
&hash_ctl,
|
|
HASH_ELEM | HASH_FUNCTION);
|
|
|
|
hash_ctl.keysize = sizeof(Oid);
|
|
hash_ctl.entrysize = sizeof(PgStat_StatFuncEntry);
|
|
hash_ctl.hash = oid_hash;
|
|
dbentry->functions = hash_create("Per-database function",
|
|
PGSTAT_FUNCTION_HASH_SIZE,
|
|
&hash_ctl,
|
|
HASH_ELEM | HASH_FUNCTION);
|
|
}
|
|
|
|
/* ----------
|
|
* pgstat_recv_autovac() -
|
|
*
|
|
* Process an autovacuum signalling message.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len)
|
|
{
|
|
PgStat_StatDBEntry *dbentry;
|
|
|
|
/*
|
|
* Store the last autovacuum time in the database's hashtable entry.
|
|
*/
|
|
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
|
|
|
|
dbentry->last_autovac_time = msg->m_start_time;
|
|
}
|
|
|
|
/* ----------
|
|
* pgstat_recv_vacuum() -
|
|
*
|
|
* Process a VACUUM message.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len)
|
|
{
|
|
PgStat_StatDBEntry *dbentry;
|
|
PgStat_StatTabEntry *tabentry;
|
|
|
|
/*
|
|
* Store the data in the table's hashtable entry.
|
|
*/
|
|
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
|
|
|
|
tabentry = pgstat_get_tab_entry(dbentry, msg->m_tableoid, true);
|
|
|
|
if (msg->m_autovacuum)
|
|
tabentry->autovac_vacuum_timestamp = msg->m_vacuumtime;
|
|
else
|
|
tabentry->vacuum_timestamp = msg->m_vacuumtime;
|
|
if (msg->m_scanned_all)
|
|
tabentry->n_live_tuples = msg->m_tuples;
|
|
/* Resetting dead_tuples to 0 is an approximation ... */
|
|
tabentry->n_dead_tuples = 0;
|
|
if (msg->m_analyze)
|
|
{
|
|
if (msg->m_scanned_all)
|
|
tabentry->last_anl_tuples = msg->m_tuples;
|
|
else
|
|
{
|
|
/* last_anl_tuples must never exceed n_live_tuples+n_dead_tuples */
|
|
tabentry->last_anl_tuples = Min(tabentry->last_anl_tuples,
|
|
tabentry->n_live_tuples);
|
|
}
|
|
|
|
if (msg->m_autovacuum)
|
|
tabentry->autovac_analyze_timestamp = msg->m_vacuumtime;
|
|
else
|
|
tabentry->analyze_timestamp = msg->m_vacuumtime;
|
|
}
|
|
else
|
|
{
|
|
/* last_anl_tuples must never exceed n_live_tuples+n_dead_tuples */
|
|
tabentry->last_anl_tuples = Min(tabentry->last_anl_tuples,
|
|
tabentry->n_live_tuples);
|
|
}
|
|
}
|
|
|
|
/* ----------
|
|
* pgstat_recv_analyze() -
|
|
*
|
|
* Process an ANALYZE message.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len)
|
|
{
|
|
PgStat_StatDBEntry *dbentry;
|
|
PgStat_StatTabEntry *tabentry;
|
|
|
|
/*
|
|
* Store the data in the table's hashtable entry.
|
|
*/
|
|
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
|
|
|
|
tabentry = pgstat_get_tab_entry(dbentry, msg->m_tableoid, true);
|
|
|
|
if (msg->m_autovacuum)
|
|
tabentry->autovac_analyze_timestamp = msg->m_analyzetime;
|
|
else
|
|
tabentry->analyze_timestamp = msg->m_analyzetime;
|
|
tabentry->n_live_tuples = msg->m_live_tuples;
|
|
tabentry->n_dead_tuples = msg->m_dead_tuples;
|
|
tabentry->last_anl_tuples = msg->m_live_tuples + msg->m_dead_tuples;
|
|
}
|
|
|
|
|
|
/* ----------
|
|
* pgstat_recv_bgwriter() -
|
|
*
|
|
* Process a BGWRITER message.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len)
|
|
{
|
|
globalStats.timed_checkpoints += msg->m_timed_checkpoints;
|
|
globalStats.requested_checkpoints += msg->m_requested_checkpoints;
|
|
globalStats.buf_written_checkpoints += msg->m_buf_written_checkpoints;
|
|
globalStats.buf_written_clean += msg->m_buf_written_clean;
|
|
globalStats.maxwritten_clean += msg->m_maxwritten_clean;
|
|
globalStats.buf_written_backend += msg->m_buf_written_backend;
|
|
globalStats.buf_alloc += msg->m_buf_alloc;
|
|
}
|
|
|
|
/* ----------
|
|
* pgstat_recv_funcstat() -
|
|
*
|
|
* Count what the backend has done.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_funcstat(PgStat_MsgFuncstat *msg, int len)
|
|
{
|
|
PgStat_FunctionEntry *funcmsg = &(msg->m_entry[0]);
|
|
PgStat_StatDBEntry *dbentry;
|
|
PgStat_StatFuncEntry *funcentry;
|
|
int i;
|
|
bool found;
|
|
|
|
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
|
|
|
|
/*
|
|
* Process all function entries in the message.
|
|
*/
|
|
for (i = 0; i < msg->m_nentries; i++, funcmsg++)
|
|
{
|
|
funcentry = (PgStat_StatFuncEntry *) hash_search(dbentry->functions,
|
|
(void *) &(funcmsg->f_id),
|
|
HASH_ENTER, &found);
|
|
|
|
if (!found)
|
|
{
|
|
/*
|
|
* If it's a new function entry, initialize counters to the values
|
|
* we just got.
|
|
*/
|
|
funcentry->f_numcalls = funcmsg->f_numcalls;
|
|
funcentry->f_time = funcmsg->f_time;
|
|
funcentry->f_time_self = funcmsg->f_time_self;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Otherwise add the values to the existing entry.
|
|
*/
|
|
funcentry->f_numcalls += funcmsg->f_numcalls;
|
|
funcentry->f_time += funcmsg->f_time;
|
|
funcentry->f_time_self += funcmsg->f_time_self;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ----------
|
|
* pgstat_recv_funcpurge() -
|
|
*
|
|
* Arrange for dead function removal.
|
|
* ----------
|
|
*/
|
|
static void
|
|
pgstat_recv_funcpurge(PgStat_MsgFuncpurge *msg, int len)
|
|
{
|
|
PgStat_StatDBEntry *dbentry;
|
|
int i;
|
|
|
|
dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
|
|
|
|
/*
|
|
* No need to purge if we don't even know the database.
|
|
*/
|
|
if (!dbentry || !dbentry->functions)
|
|
return;
|
|
|
|
/*
|
|
* Process all function entries in the message.
|
|
*/
|
|
for (i = 0; i < msg->m_nentries; i++)
|
|
{
|
|
/* Remove from hashtable if present; we don't care if it's not. */
|
|
(void) hash_search(dbentry->functions,
|
|
(void *) &(msg->m_functionid[i]),
|
|
HASH_REMOVE, NULL);
|
|
}
|
|
}
|