* - Add a pgstat config column to pg_database, so this
* entire thing can be enabled/disabled on a per db basis.
*
- * Copyright (c) 2001-2006, PostgreSQL Global Development Group
+ * Copyright (c) 2001-2011, PostgreSQL Global Development Group
*
- * $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.130 2006/06/20 22:52:00 tgl Exp $
+ * src/backend/postmaster/pgstat.c
* ----------
*/
#include "postgres.h"
#include <arpa/inet.h>
#include <signal.h>
#include <time.h>
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#endif
+#ifdef HAVE_SYS_POLL_H
+#include <sys/poll.h>
+#endif
#include "pgstat.h"
#include "access/heapam.h"
+#include "access/transam.h"
+#include "access/twophase_rmgr.h"
#include "access/xact.h"
#include "catalog/pg_database.h"
+#include "catalog/pg_proc.h"
+#include "libpq/ip.h"
#include "libpq/libpq.h"
#include "libpq/pqsignal.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
+#include "pg_trace.h"
#include "postmaster/autovacuum.h"
#include "postmaster/fork_process.h"
#include "postmaster/postmaster.h"
#include "storage/ipc.h"
#include "storage/pg_shmem.h"
#include "storage/pmsignal.h"
-#include "storage/procarray.h"
-#include "tcop/tcopprot.h"
-#include "utils/hsearch.h"
+#include "storage/procsignal.h"
+#include "utils/guc.h"
#include "utils/memutils.h"
#include "utils/ps_status.h"
#include "utils/rel.h"
-#include "utils/syscache.h"
+#include "utils/tqual.h"
/* ----------
* Paths for the statistics files (relative to installation's $PGDATA).
* ----------
*/
-#define PGSTAT_STAT_FILENAME "global/pgstat.stat"
-#define PGSTAT_STAT_TMPFILE "global/pgstat.tmp"
+#define PGSTAT_STAT_PERMANENT_FILENAME "global/pgstat.stat"
+#define PGSTAT_STAT_PERMANENT_TMPFILE "global/pgstat.tmp"
/* ----------
* Timer definitions.
* ----------
*/
-#define PGSTAT_STAT_INTERVAL 500 /* How often to write the status file;
- * in milliseconds. */
+#define PGSTAT_STAT_INTERVAL 500 /* Minimum time between stats file
+ * updates; in milliseconds. */
+
+#define PGSTAT_RETRY_DELAY 10 /* How long to wait between statistics
+ * update requests; in milliseconds. */
+
+#define PGSTAT_MAX_WAIT_TIME 5000 /* Maximum time to wait for a stats
+ * file update; in milliseconds. */
#define PGSTAT_RESTART_INTERVAL 60 /* How often to attempt to restart a
* failed statistics collector; in
* seconds. */
-/* ----------
- * Amount of space reserved in pgstat_recvbuffer().
- * ----------
- */
-#define PGSTAT_RECVBUFFERSZ ((int) (1024 * sizeof(PgStat_Msg)))
+#define PGSTAT_SELECT_TIMEOUT 2 /* How often to check for postmaster
+ * death; in seconds. */
+
+#define PGSTAT_POLL_LOOP_COUNT (PGSTAT_MAX_WAIT_TIME / PGSTAT_RETRY_DELAY)
+
/* ----------
* The initial size hints for the hash tables used in the collector.
*/
#define PGSTAT_DB_HASH_SIZE 16
#define PGSTAT_TAB_HASH_SIZE 512
+#define PGSTAT_FUNCTION_HASH_SIZE 512
/* ----------
* GUC parameters
* ----------
*/
-bool pgstat_collect_startcollector = true;
-bool pgstat_collect_resetonpmstart = false;
-bool pgstat_collect_tuplelevel = false;
-bool pgstat_collect_blocklevel = false;
-bool pgstat_collect_querystring = false;
+bool pgstat_track_activities = false;
+bool pgstat_track_counts = false;
+int pgstat_track_functions = TRACK_FUNC_OFF;
+int pgstat_track_activity_query_size = 1024;
+
+/* ----------
+ * Built from GUC parameter
+ * ----------
+ */
+char *pgstat_stat_filename = NULL;
+char *pgstat_stat_tmpname = NULL;
+
+/*
+ * BgWriter global statistics counters (unused in other processes).
+ * Stored directly in a stats message structure so it can be sent
+ * without needing to copy things around. We assume this inits to zeroes.
+ */
+PgStat_MsgBgWriter BgWriterStats;
/* ----------
* Local data
* ----------
*/
-NON_EXEC_STATIC int pgStatSock = -1;
-NON_EXEC_STATIC int pgStatPipe[2] = {-1, -1};
+NON_EXEC_STATIC pgsocket pgStatSock = PGINVALID_SOCKET;
static struct sockaddr_storage pgStatAddr;
-static pid_t pgStatCollectorPid = 0;
-
static time_t last_pgstat_start_time;
static bool pgStatRunningInCollector = false;
/*
- * Place where backends store per-table info to be sent to the collector.
- * We store shared relations separately from non-shared ones, to be able to
- * send them in separate messages.
+ * Structures in which backends store per-table info that's waiting to be
+ * sent to the collector.
+ *
+ * NOTE: once allocated, TabStatusArray structures are never moved or deleted
+ * for the life of the backend. Also, we zero out the t_id fields of the
+ * contained PgStat_TableStatus structs whenever they are not actively in use.
+ * This allows relcache pgstat_info pointers to be treated as long-lived data,
+ * avoiding repeated searches in pgstat_initstats() when a relation is
+ * repeatedly opened during a transaction.
*/
-typedef struct TabStatArray
+#define TABSTAT_QUANTUM 100 /* we alloc this many at a time */
+
+typedef struct TabStatusArray
{
- int tsa_alloc; /* num allocated */
- int tsa_used; /* num actually used */
- PgStat_MsgTabstat **tsa_messages; /* the array itself */
-} TabStatArray;
+ struct TabStatusArray *tsa_next; /* link to next array, if any */
+ int tsa_used; /* # entries currently used */
+ PgStat_TableStatus tsa_entries[TABSTAT_QUANTUM]; /* per-table data */
+} TabStatusArray;
+
+static TabStatusArray *pgStatTabList = NULL;
+
+/*
+ * Backends store per-function info that's waiting to be sent to the collector
+ * in this hash table (indexed by function OID).
+ */
+static HTAB *pgStatFunctions = NULL;
+
+/*
+ * Indicates if backend has some function stats that it hasn't yet
+ * sent to the collector.
+ */
+static bool have_function_stats = false;
-#define TABSTAT_QUANTUM 4 /* we alloc this many at a time */
+/*
+ * Tuple insertion/deletion counts for an open transaction can't be propagated
+ * into PgStat_TableStatus counters until we know if it is going to commit
+ * or abort. Hence, we keep these counts in per-subxact structs that live
+ * in TopTransactionContext. This data structure is designed on the assumption
+ * that subxacts won't usually modify very many tables.
+ */
+typedef struct PgStat_SubXactStatus
+{
+ int nest_level; /* subtransaction nest level */
+ struct PgStat_SubXactStatus *prev; /* higher-level subxact if any */
+ PgStat_TableXactStatus *first; /* head of list for this subxact */
+} PgStat_SubXactStatus;
-static TabStatArray RegularTabStat = {0, 0, NULL};
-static TabStatArray SharedTabStat = {0, 0, NULL};
+static PgStat_SubXactStatus *pgStatXactStack = NULL;
static int pgStatXactCommit = 0;
static int pgStatXactRollback = 0;
-static TransactionId pgStatDBHashXact = InvalidTransactionId;
+/* Record that's written to 2PC state file when pgstat state is persisted */
+typedef struct TwoPhasePgStatRecord
+{
+ PgStat_Counter tuples_inserted; /* tuples inserted in xact */
+ PgStat_Counter tuples_updated; /* tuples updated in xact */
+ PgStat_Counter tuples_deleted; /* tuples deleted in xact */
+ Oid t_id; /* table's OID */
+ bool t_shared; /* is it a shared catalog? */
+} TwoPhasePgStatRecord;
+
+/*
+ * Info about current "snapshot" of stats file
+ */
+static MemoryContext pgStatLocalContext = NULL;
static HTAB *pgStatDBHash = NULL;
-static TransactionId pgStatLocalStatusXact = InvalidTransactionId;
static PgBackendStatus *localBackendStatusTable = NULL;
static int localNumBackends = 0;
-static volatile bool need_statwrite;
+/*
+ * Cluster wide statistics, kept in the stats collector.
+ * Contains statistics that are not collected per database
+ * or per table.
+ */
+static PgStat_GlobalStats globalStats;
+
+/* Last time the collector successfully wrote the stats file */
+static TimestampTz last_statwrite;
+
+/* Latest statistics request time from backends */
+static TimestampTz last_statrequest;
+
+static volatile bool need_exit = false;
+static volatile bool got_SIGHUP = false;
+
+/*
+ * Total time charged to functions so far in the current backend.
+ * We use this to help separate "self" and "other" time charges.
+ * (We assume this initializes to zero.)
+ */
+static instr_time total_func_time;
/* ----------
* ----------
*/
#ifdef EXEC_BACKEND
-
-typedef enum STATS_PROCESS_TYPE
-{
- STAT_PROC_BUFFER,
- STAT_PROC_COLLECTOR
-} STATS_PROCESS_TYPE;
-
-static pid_t pgstat_forkexec(STATS_PROCESS_TYPE procType);
-static void pgstat_parseArgs(int argc, char *argv[]);
+static pid_t pgstat_forkexec(void);
#endif
-NON_EXEC_STATIC void PgstatBufferMain(int argc, char *argv[]);
NON_EXEC_STATIC void PgstatCollectorMain(int argc, char *argv[]);
-static void force_statwrite(SIGNAL_ARGS);
-static void pgstat_recvbuffer(void);
static void pgstat_exit(SIGNAL_ARGS);
-static void pgstat_die(SIGNAL_ARGS);
static void pgstat_beshutdown_hook(int code, Datum arg);
+static void pgstat_sighup_handler(SIGNAL_ARGS);
static PgStat_StatDBEntry *pgstat_get_db_entry(Oid databaseid, bool create);
-static void pgstat_drop_database(Oid databaseid);
-static void pgstat_write_statsfile(void);
-static void pgstat_read_statsfile(HTAB **dbhash, Oid onlydb);
+static PgStat_StatTabEntry *pgstat_get_tab_entry(PgStat_StatDBEntry *dbentry,
+ Oid tableoid, bool create);
+static void pgstat_write_statsfile(bool permanent);
+static HTAB *pgstat_read_statsfile(Oid onlydb, bool permanent);
static void backend_read_statsfile(void);
static void pgstat_read_current_status(void);
+static void pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg);
+static void pgstat_send_funcstats(void);
+static HTAB *pgstat_collect_oids(Oid catalogid);
+
+static PgStat_TableStatus *get_tabstat_entry(Oid rel_id, bool isshared);
+
+static void pgstat_setup_memcxt(void);
+
static void pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype);
static void pgstat_send(void *msg, int len);
+static void pgstat_recv_inquiry(PgStat_MsgInquiry *msg, int len);
static void pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len);
static void pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len);
static void pgstat_recv_dropdb(PgStat_MsgDropdb *msg, int len);
static void pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len);
+static void pgstat_recv_resetsharedcounter(PgStat_MsgResetsharedcounter *msg, int len);
+static void pgstat_recv_resetsinglecounter(PgStat_MsgResetsinglecounter *msg, int len);
static void pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len);
static void pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len);
static void pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len);
+static void pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len);
+static void pgstat_recv_funcstat(PgStat_MsgFuncstat *msg, int len);
+static void pgstat_recv_funcpurge(PgStat_MsgFuncpurge *msg, int len);
+static void pgstat_recv_recoveryconflict(PgStat_MsgRecoveryConflict *msg, int len);
/* ------------------------------------------------------------
char test_byte;
int sel_res;
int tries = 0;
-
-#define TESTBYTEVAL ((char) 199)
- /*
- * Force start of collector daemon if something to collect. Note that
- * pgstat_collect_querystring is now an independent facility that does
- * not require the collector daemon.
- */
- if (pgstat_collect_tuplelevel ||
- pgstat_collect_blocklevel)
- pgstat_collect_startcollector = true;
-
- /*
- * If we don't have to start a collector or should reset the collected
- * statistics on postmaster start, simply remove the stats file.
- */
- if (!pgstat_collect_startcollector || pgstat_collect_resetonpmstart)
- pgstat_reset_all();
-
- /*
- * Nothing else required if collector will not get started
- */
- if (!pgstat_collect_startcollector)
- return;
+#define TESTBYTEVAL ((char) 199)
/*
* Create the UDP socket for sending and receiving statistic messages
if (++tries > 1)
ereport(LOG,
- (errmsg("trying another address for the statistics collector")));
-
+ (errmsg("trying another address for the statistics collector")));
+
/*
* Create the socket.
*/
- if ((pgStatSock = socket(addr->ai_family, SOCK_DGRAM, 0)) < 0)
+ if ((pgStatSock = socket(addr->ai_family, SOCK_DGRAM, 0)) == PGINVALID_SOCKET)
{
ereport(LOG,
(errcode_for_socket_access(),
(errcode_for_socket_access(),
errmsg("could not bind socket for statistics collector: %m")));
closesocket(pgStatSock);
- pgStatSock = -1;
+ pgStatSock = PGINVALID_SOCKET;
continue;
}
(errcode_for_socket_access(),
errmsg("could not get address of socket for statistics collector: %m")));
closesocket(pgStatSock);
- pgStatSock = -1;
+ pgStatSock = PGINVALID_SOCKET;
continue;
}
(errcode_for_socket_access(),
errmsg("could not connect socket for statistics collector: %m")));
closesocket(pgStatSock);
- pgStatSock = -1;
+ pgStatSock = PGINVALID_SOCKET;
continue;
}
* 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;
+ pgStatSock = PGINVALID_SOCKET;
continue;
}
{
FD_ZERO(&rset);
FD_SET(pgStatSock, &rset);
+
tv.tv_sec = 0;
tv.tv_usec = 500000;
sel_res = select(pgStatSock + 1, &rset, NULL, NULL, &tv);
(errcode_for_socket_access(),
errmsg("select() failed in statistics collector: %m")));
closesocket(pgStatSock);
- pgStatSock = -1;
+ pgStatSock = PGINVALID_SOCKET;
continue;
}
if (sel_res == 0 || !FD_ISSET(pgStatSock, &rset))
(errcode(ERRCODE_CONNECTION_FAILURE),
errmsg("test message did not get through on socket for statistics collector")));
closesocket(pgStatSock);
- pgStatSock = -1;
+ pgStatSock = PGINVALID_SOCKET;
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;
+ pgStatSock = PGINVALID_SOCKET;
continue;
}
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("incorrect test message transmission on socket for statistics collector")));
closesocket(pgStatSock);
- pgStatSock = -1;
+ pgStatSock = PGINVALID_SOCKET;
continue;
}
}
/* Did we find a working address? */
- if (!addr || pgStatSock < 0)
+ if (!addr || pgStatSock == PGINVALID_SOCKET)
goto startup_failed;
/*
* Set the socket to non-blocking IO. This ensures that if the collector
- * falls behind (despite the buffering process), statistics messages will
- * be discarded; backends won't block waiting to send messages to 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))
{
if (addrs)
pg_freeaddrinfo_all(hints.ai_family, addrs);
- if (pgStatSock >= 0)
+ if (pgStatSock != PGINVALID_SOCKET)
closesocket(pgStatSock);
- pgStatSock = -1;
+ pgStatSock = PGINVALID_SOCKET;
- /* Adjust GUC variables to suppress useless activity */
- pgstat_collect_startcollector = false;
- pgstat_collect_tuplelevel = false;
- pgstat_collect_blocklevel = false;
+ /*
+ * 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 used on server start if the
- * stats_reset_on_server_start feature is enabled, or if WAL
+ * 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_filename);
+ unlink(PGSTAT_STAT_PERMANENT_FILENAME);
}
#ifdef EXEC_BACKEND
/*
* pgstat_forkexec() -
*
- * Format up the arglist for, then fork and exec, statistics
- * (buffer and collector) processes
+ * Format up the arglist for, then fork and exec, statistics collector process
*/
static pid_t
-pgstat_forkexec(STATS_PROCESS_TYPE procType)
+pgstat_forkexec(void)
{
char *av[10];
- int ac = 0,
- bufc = 0,
- i;
- char pgstatBuf[2][32];
+ int ac = 0;
av[ac++] = "postgres";
-
- switch (procType)
- {
- case STAT_PROC_BUFFER:
- av[ac++] = "--forkbuf";
- break;
-
- case STAT_PROC_COLLECTOR:
- av[ac++] = "--forkcol";
- break;
-
- default:
- Assert(false);
- }
-
+ av[ac++] = "--forkcol";
av[ac++] = NULL; /* filled in by postmaster_forkexec */
- /* postgres_exec_path is not passed by write_backend_variables */
- av[ac++] = postgres_exec_path;
-
- /* Add to the arg list */
- Assert(bufc <= lengthof(pgstatBuf));
- for (i = 0; i < bufc; i++)
- av[ac++] = pgstatBuf[i];
-
av[ac] = NULL;
Assert(ac < lengthof(av));
return postmaster_forkexec(ac, av);
}
-
-
-/*
- * pgstat_parseArgs() -
- *
- * Extract data from the arglist for exec'ed statistics
- * (buffer and collector) processes
- */
-static void
-pgstat_parseArgs(int argc, char *argv[])
-{
- Assert(argc == 4);
-
- argc = 3;
- StrNCpy(postgres_exec_path, argv[argc++], MAXPGPATH);
-}
#endif /* EXEC_BACKEND */
-/* ----------
+/*
* pgstat_start() -
*
* Called from postmaster at startup or after an existing 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)
pid_t pgStatPid;
/*
- * Do nothing if no collector needed
+ * Check that the socket is there, else pgstat_init failed and we can do
+ * nothing useful.
*/
- if (!pgstat_collect_startcollector)
+ if (pgStatSock == PGINVALID_SOCKET)
return 0;
/*
return 0;
last_pgstat_start_time = curtime;
- /*
- * Check that the socket is there, else pgstat_init failed.
- */
- if (pgStatSock < 0)
- {
- ereport(LOG,
- (errmsg("statistics collector startup skipped")));
-
- /*
- * We can only get here if someone tries to manually turn
- * pgstat_collect_startcollector on after it had been off.
- */
- pgstat_collect_startcollector = false;
- return 0;
- }
-
/*
* Okay, fork off the collector.
*/
#ifdef EXEC_BACKEND
- switch ((pgStatPid = pgstat_forkexec(STAT_PROC_BUFFER)))
+ switch ((pgStatPid = pgstat_forkexec()))
#else
switch ((pgStatPid = fork_process()))
#endif
{
case -1:
ereport(LOG,
- (errmsg("could not fork statistics buffer: %m")));
+ (errmsg("could not fork statistics collector: %m")));
return 0;
#ifndef EXEC_BACKEND
/* Drop our connection to postmaster's shared memory, as well */
PGSharedMemoryDetach();
- PgstatBufferMain(0, NULL);
+ PgstatCollectorMain(0, NULL);
break;
#endif
return 0;
}
+void
+allow_immediate_pgstat_restart(void)
+{
+ last_pgstat_start_time = 0;
+}
/* ------------------------------------------------------------
* Public functions used by backends follow
/* ----------
- * pgstat_report_tabstat() -
+ * pgstat_report_stat() -
*
- * Called from tcop/postgres.c to send the so far collected
- * per table access statistics to the collector.
+ * 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_tabstat(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;
- if (pgStatSock < 0 ||
- (!pgstat_collect_tuplelevel &&
- !pgstat_collect_blocklevel))
- {
- /* Not reporting stats, so just flush whatever we have */
- RegularTabStat.tsa_used = 0;
- SharedTabStat.tsa_used = 0;
+ /* Don't expend a clock check if nothing to do */
+ if ((pgStatTabList == NULL || pgStatTabList->tsa_used == 0)
+ && !have_function_stats)
return;
- }
/*
- * For each message buffer used during the last query set the header
- * fields and send it out.
+ * 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.
*/
- for (i = 0; i < RegularTabStat.tsa_used; i++)
+ 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)
{
- PgStat_MsgTabstat *tsmsg = RegularTabStat.tsa_messages[i];
- int n;
- int len;
+ 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();
+}
- n = tsmsg->m_nentries;
- len = offsetof(PgStat_MsgTabstat, m_entry[0]) +
- n * sizeof(PgStat_TableEntry);
+/*
+ * 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 == PGINVALID_SOCKET)
+ 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;
-
- pgstat_setheader(&tsmsg->m_hdr, PGSTAT_MTYPE_TABSTAT);
- tsmsg->m_databaseid = MyDatabaseId;
- pgstat_send(tsmsg, len);
}
- RegularTabStat.tsa_used = 0;
+ else
+ {
+ tsmsg->m_xact_commit = 0;
+ tsmsg->m_xact_rollback = 0;
+ }
- /* Ditto, for shared relations */
- for (i = 0; i < SharedTabStat.tsa_used; i++)
+ 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_MsgTabstat *tsmsg = SharedTabStat.tsa_messages[i];
- int n;
- int len;
+ PgStat_FunctionEntry *m_ent;
- n = tsmsg->m_nentries;
- len = offsetof(PgStat_MsgTabstat, m_entry[0]) +
- n * sizeof(PgStat_TableEntry);
+ /* Skip it if no counts accumulated since last time */
+ if (memcmp(&entry->f_counts, &all_zeroes,
+ sizeof(PgStat_FunctionCounts)) == 0)
+ continue;
- /* We don't report transaction commit/abort here */
- tsmsg->m_xact_commit = 0;
- tsmsg->m_xact_rollback = 0;
+ /* 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;
+ }
- pgstat_setheader(&tsmsg->m_hdr, PGSTAT_MTYPE_TABSTAT);
- tsmsg->m_databaseid = InvalidOid;
- pgstat_send(tsmsg, len);
+ /* reset the entry's counts */
+ MemSet(&entry->f_counts, 0, sizeof(PgStat_FunctionCounts));
}
- SharedTabStat.tsa_used = 0;
+
+ 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_tabstat() -
+ * pgstat_vacuum_stat() -
*
* Will tell the collector about objects he can get rid of.
* ----------
*/
void
-pgstat_vacuum_tabstat(void)
+pgstat_vacuum_stat(void)
{
- List *oidlist;
- Relation rel;
- HeapScanDesc scan;
- HeapTuple tup;
+ 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)
+ if (pgStatSock == PGINVALID_SOCKET)
return;
/*
/*
* Read pg_database and make a list of OIDs of all existing databases
*/
- oidlist = NIL;
- rel = heap_open(DatabaseRelationId, AccessShareLock);
- scan = heap_beginscan(rel, SnapshotNow, 0, NULL);
- while ((tup = heap_getnext(scan, ForwardScanDirection)) != NULL)
- {
- oidlist = lappend_oid(oidlist, HeapTupleGetOid(tup));
- }
- heap_endscan(scan);
- heap_close(rel, AccessShareLock);
+ htab = pgstat_collect_oids(DatabaseRelationId);
/*
* Search the database hash table for dead databases and tell the
{
Oid dbid = dbentry->databaseid;
- if (!list_member_oid(oidlist, dbid))
+ 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 */
- list_free(oidlist);
+ hash_destroy(htab);
/*
* Lookup our own database entry; if not found, nothing more to do.
/*
* Similarly to above, make a list of all known relations in this DB.
*/
- oidlist = NIL;
- rel = heap_open(RelationRelationId, AccessShareLock);
- scan = heap_beginscan(rel, SnapshotNow, 0, NULL);
- while ((tup = heap_getnext(scan, ForwardScanDirection)) != NULL)
- {
- oidlist = lappend_oid(oidlist, HeapTupleGetOid(tup));
- }
- heap_endscan(scan);
- heap_close(rel, AccessShareLock);
+ htab = pgstat_collect_oids(RelationRelationId);
/*
* Initialize our messages table counter to zero
hash_seq_init(&hstat, dbentry->tables);
while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&hstat)) != NULL)
{
- if (list_member_oid(oidlist, tabentry->tableid))
+ 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++] = tabentry->tableid;
+ msg.m_tableid[msg.m_nentries++] = tabid;
/*
* If the message is full, send it out and reinitialize to empty
}
/* Clean up */
- list_free(oidlist);
+ 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. (However, we make the table in CurrentMemoryContext
+ * so that it will be freed properly in event of an error.)
+ * ----------
+ */
+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;
+ hash_ctl.hcxt = CurrentMemoryContext;
+ htab = hash_create("Temporary table of OIDs",
+ PGSTAT_TAB_HASH_SIZE,
+ &hash_ctl,
+ HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
+
+ 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;
}
*
* 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_tabstat().)
+ * via future invocations of pgstat_vacuum_stat().)
* ----------
*/
-static void
+void
pgstat_drop_database(Oid databaseid)
{
PgStat_MsgDropdb msg;
- if (pgStatSock < 0)
+ if (pgStatSock == PGINVALID_SOCKET)
return;
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DROPDB);
*
* 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_tabstat().)
+ * 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)
+ if (pgStatSock == PGINVALID_SOCKET)
return;
msg.m_tableid[0] = relid;
msg.m_nentries = 1;
- len = offsetof(PgStat_MsgTabpurge, m_tableid[0]) + sizeof(Oid);
+ 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_MsgResetcounter msg;
- if (pgStatSock < 0)
+ if (pgStatSock == PGINVALID_SOCKET)
return;
if (!superuser())
pgstat_send(&msg, sizeof(msg));
}
-
/* ----------
- * pgstat_report_autovac() -
+ * pgstat_reset_shared_counters() -
*
- * 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.
+ * Tell the statistics collector to reset cluster-wide shared counters.
* ----------
*/
void
-pgstat_report_autovac(Oid dboid)
+pgstat_reset_shared_counters(const char *target)
{
- PgStat_MsgAutovacStart msg;
+ PgStat_MsgResetsharedcounter msg;
- if (pgStatSock < 0)
+ if (pgStatSock == PGINVALID_SOCKET)
return;
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_AUTOVAC_START);
- msg.m_databaseid = dboid;
- msg.m_start_time = GetCurrentTimestamp();
-
+ if (!superuser())
+ ereport(ERROR,
+ (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+ errmsg("must be superuser to reset statistics counters")));
+
+ if (strcmp(target, "bgwriter") == 0)
+ msg.m_resettarget = RESET_BGWRITER;
+ else
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("unrecognized reset target: \"%s\"", target),
+ errhint("Target must be \"bgwriter\".")));
+
+ pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETSHAREDCOUNTER);
+ pgstat_send(&msg, sizeof(msg));
+}
+
+/* ----------
+ * pgstat_reset_single_counter() -
+ *
+ * Tell the statistics collector to reset a single counter.
+ * ----------
+ */
+void
+pgstat_reset_single_counter(Oid objoid, PgStat_Single_Reset_Type type)
+{
+ PgStat_MsgResetsinglecounter msg;
+
+ if (pgStatSock == PGINVALID_SOCKET)
+ return;
+
+ if (!superuser())
+ ereport(ERROR,
+ (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+ errmsg("must be superuser to reset statistics counters")));
+
+ pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETSINGLECOUNTER);
+ msg.m_databaseid = MyDatabaseId;
+ msg.m_resettype = type;
+ msg.m_objectid = objoid;
+
+ 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 == PGINVALID_SOCKET)
+ return;
+
+ pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_AUTOVAC_START);
+ msg.m_databaseid = dboid;
+ msg.m_start_time = GetCurrentTimestamp();
+
pgstat_send(&msg, sizeof(msg));
}
* ---------
*/
void
-pgstat_report_vacuum(Oid tableoid, bool shared,
- bool analyze, PgStat_Counter tuples)
+pgstat_report_vacuum(Oid tableoid, bool shared, PgStat_Counter tuples)
{
PgStat_MsgVacuum msg;
- if (pgStatSock < 0 ||
- !pgstat_collect_tuplelevel)
+ if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
return;
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_VACUUM);
msg.m_databaseid = shared ? InvalidOid : MyDatabaseId;
msg.m_tableoid = tableoid;
- msg.m_analyze = analyze;
- msg.m_autovacuum = IsAutoVacuumProcess(); /* is this autovacuum? */
+ msg.m_autovacuum = IsAutoVacuumWorkerProcess();
msg.m_vacuumtime = GetCurrentTimestamp();
msg.m_tuples = tuples;
pgstat_send(&msg, sizeof(msg));
* --------
*/
void
-pgstat_report_analyze(Oid tableoid, bool shared, PgStat_Counter livetuples,
- PgStat_Counter deadtuples)
+pgstat_report_analyze(Relation rel,
+ PgStat_Counter livetuples, PgStat_Counter deadtuples)
{
PgStat_MsgAnalyze msg;
- if (pgStatSock < 0 ||
- !pgstat_collect_tuplelevel)
+ if (pgStatSock == PGINVALID_SOCKET || !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_updated + trans->tuples_deleted;
+ }
+ /* count stuff inserted by already-aborted subxacts, too */
+ deadtuples -= rel->pgstat_info->t_counts.t_delta_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 = shared ? InvalidOid : MyDatabaseId;
- msg.m_tableoid = tableoid;
- msg.m_autovacuum = IsAutoVacuumProcess(); /* is this autovacuum? */
+ msg.m_databaseid = rel->rd_rel->relisshared ? InvalidOid : MyDatabaseId;
+ msg.m_tableoid = RelationGetRelid(rel);
+ msg.m_autovacuum = IsAutoVacuumWorkerProcess();
msg.m_analyzetime = GetCurrentTimestamp();
msg.m_live_tuples = livetuples;
msg.m_dead_tuples = deadtuples;
pgstat_send(&msg, sizeof(msg));
}
+/* --------
+ * pgstat_report_recovery_conflict() -
+ *
+ * Tell the collector about a Hot Standby recovery conflict.
+ * --------
+ */
+void
+pgstat_report_recovery_conflict(int reason)
+{
+ PgStat_MsgRecoveryConflict msg;
+
+ if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
+ return;
+
+ pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RECOVERYCONFLICT);
+ msg.m_databaseid = MyDatabaseId;
+ msg.m_reason = reason;
+ pgstat_send(&msg, sizeof(msg));
+}
/* ----------
* pgstat_ping() -
{
PgStat_MsgDummy msg;
- if (pgStatSock < 0)
+ if (pgStatSock == PGINVALID_SOCKET)
return;
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DUMMY);
pgstat_send(&msg, sizeof(msg));
}
-/*
- * Enlarge a TabStatArray
+/* ----------
+ * pgstat_send_inquiry() -
+ *
+ * Notify collector that we need fresh data.
+ * ts specifies the minimum acceptable timestamp for the stats file.
+ * ----------
*/
static void
-more_tabstat_space(TabStatArray *tsarr)
+pgstat_send_inquiry(TimestampTz ts)
{
- PgStat_MsgTabstat *newMessages;
- PgStat_MsgTabstat **msgArray;
- int newAlloc;
- int i;
+ PgStat_MsgInquiry msg;
+
+ pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_INQUIRY);
+ msg.inquiry_time = ts;
+ pgstat_send(&msg, sizeof(msg));
+}
+
- AssertArg(PointerIsValid(tsarr));
+/*
+ * 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;
+ }
- newAlloc = tsarr->tsa_alloc + TABSTAT_QUANTUM;
+ if (!pgStatFunctions)
+ {
+ /* First time through - initialize function stat table */
+ HASHCTL hash_ctl;
- /* Create (another) quantum of message buffers */
- newMessages = (PgStat_MsgTabstat *)
- MemoryContextAllocZero(TopMemoryContext,
- sizeof(PgStat_MsgTabstat) * TABSTAT_QUANTUM);
+ 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);
+ }
- /* Create or enlarge the pointer array */
- if (tsarr->tsa_messages == NULL)
- msgArray = (PgStat_MsgTabstat **)
- MemoryContextAlloc(TopMemoryContext,
- sizeof(PgStat_MsgTabstat *) * newAlloc);
- else
- msgArray = (PgStat_MsgTabstat **)
- repalloc(tsarr->tsa_messages,
- sizeof(PgStat_MsgTabstat *) * newAlloc);
+ /* 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);
+}
+
+/*
+ * find_funcstat_entry - find any existing PgStat_BackendFunctionEntry entry
+ * for specified function
+ *
+ * If no entry, return NULL, don't create a new one
+ */
+PgStat_BackendFunctionEntry *
+find_funcstat_entry(Oid func_id)
+{
+ if (pgStatFunctions == NULL)
+ return NULL;
+
+ return (PgStat_BackendFunctionEntry *) hash_search(pgStatFunctions,
+ (void *) &func_id,
+ HASH_FIND, NULL);
+}
+
+/*
+ * 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);
- for (i = 0; i < TABSTAT_QUANTUM; i++)
- msgArray[tsarr->tsa_alloc + i] = newMessages++;
- tsarr->tsa_messages = msgArray;
- tsarr->tsa_alloc = newAlloc;
+ /* 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);
- Assert(tsarr->tsa_used < tsarr->tsa_alloc);
+ /* 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() -
*
- * Called from various places usually dealing with initialization
- * of Relation or Scan structures. The data placed into these
- * structures from here tell where later to count for buffer reads,
- * scans and tuples fetched.
+ * 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(PgStat_Info *stats, Relation rel)
+pgstat_initstats(Relation rel)
{
Oid rel_id = rel->rd_id;
- PgStat_TableEntry *useent;
- TabStatArray *tsarr;
- PgStat_MsgTabstat *tsmsg;
- int mb;
- int i;
+ 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 == PGINVALID_SOCKET || !pgstat_track_counts)
+ {
+ /* We're not counting at all */
+ rel->pgstat_info = NULL;
+ return;
+ }
/*
- * Initialize data not to count at all.
+ * If we already set up this relation in the current transaction, nothing
+ * to do.
*/
- stats->tabentry = NULL;
-
- if (pgStatSock < 0 ||
- !(pgstat_collect_tuplelevel ||
- pgstat_collect_blocklevel))
+ if (rel->pgstat_info != NULL &&
+ rel->pgstat_info->t_id == rel_id)
return;
- tsarr = rel->rd_rel->relisshared ? &SharedTabStat : &RegularTabStat;
+ /* 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 message slots for this relation.
+ * Search the already-used tabstat slots for this relation.
*/
- for (mb = 0; mb < tsarr->tsa_used; mb++)
+ prev_tsa = NULL;
+ for (tsa = pgStatTabList; tsa != NULL; prev_tsa = tsa, tsa = tsa->tsa_next)
{
- tsmsg = tsarr->tsa_messages[mb];
-
- for (i = tsmsg->m_nentries; --i >= 0;)
+ for (i = 0; i < tsa->tsa_used; i++)
{
- if (tsmsg->m_entry[i].t_id == rel_id)
- {
- stats->tabentry = (void *) &(tsmsg->m_entry[i]);
- return;
- }
+ entry = &tsa->tsa_entries[i];
+ if (entry->t_id == rel_id)
+ return entry;
}
- if (tsmsg->m_nentries >= PGSTAT_NUM_TABENTRIES)
- continue;
-
- /*
- * Not found, but found a message buffer with an empty slot instead.
- * Fine, let's use this one.
- */
- i = tsmsg->m_nentries++;
- useent = &tsmsg->m_entry[i];
- MemSet(useent, 0, sizeof(PgStat_TableEntry));
- useent->t_id = rel_id;
- stats->tabentry = (void *) useent;
- return;
+ 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;
+ }
}
/*
- * If we ran out of message buffers, we just allocate more.
+ * We ran out of tabstat slots, so allocate more. Be sure they're zeroed.
*/
- if (tsarr->tsa_used >= tsarr->tsa_alloc)
- more_tabstat_space(tsarr);
+ tsa = (TabStatusArray *) MemoryContextAllocZero(TopMemoryContext,
+ sizeof(TabStatusArray));
+ if (prev_tsa)
+ prev_tsa->tsa_next = tsa;
+ else
+ pgStatTabList = tsa;
/*
- * Use the first entry of the next message buffer.
+ * Use the first entry of the new TabStatusArray.
*/
- mb = tsarr->tsa_used++;
- tsmsg = tsarr->tsa_messages[mb];
- tsmsg->m_nentries = 1;
- useent = &tsmsg->m_entry[0];
- MemSet(useent, 0, sizeof(PgStat_TableEntry));
- useent->t_id = rel_id;
- stats->tabentry = (void *) useent;
+ entry = &tsa->tsa_entries[tsa->tsa_used++];
+ entry->t_id = rel_id;
+ entry->t_shared = isshared;
+ return entry;
}
-
-/* ----------
- * pgstat_count_xact_commit() -
+/*
+ * find_tabstat_entry - find any existing PgStat_TableStatus entry for rel
*
- * Called from access/transam/xact.c to count transaction commits.
- * ----------
+ * If no entry, return NULL, don't create a new one
*/
-void
-pgstat_count_xact_commit(void)
+PgStat_TableStatus *
+find_tabstat_entry(Oid rel_id)
{
- if (!pgstat_collect_tuplelevel &&
- !pgstat_collect_blocklevel)
- return;
+ PgStat_TableStatus *entry;
+ TabStatusArray *tsa;
+ int i;
- pgStatXactCommit++;
+ for (tsa = pgStatTabList; tsa != NULL; 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 there was no relation activity yet, just make one existing message
- * buffer used without slots, causing the next report to tell new
- * xact-counters.
- */
- if (RegularTabStat.tsa_alloc == 0)
- more_tabstat_space(&RegularTabStat);
+ /* Not present */
+ return NULL;
+}
+
+/*
+ * 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;
- if (RegularTabStat.tsa_used == 0)
+ xact_state = pgStatXactStack;
+ if (xact_state == NULL || xact_state->nest_level != nest_level)
{
- RegularTabStat.tsa_used++;
- RegularTabStat.tsa_messages[0]->m_nentries = 0;
+ 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_xact_rollback() -
- *
- * Called from access/transam/xact.c to count transaction rollbacks.
- * ----------
+/*
+ * pgstat_count_heap_insert - count a tuple insertion
*/
void
-pgstat_count_xact_rollback(void)
+pgstat_count_heap_insert(Relation rel)
{
- if (!pgstat_collect_tuplelevel &&
- !pgstat_collect_blocklevel)
- return;
+ PgStat_TableStatus *pgstat_info = rel->pgstat_info;
- pgStatXactRollback++;
+ if (pgstat_info != NULL)
+ {
+ /* We have to log the effect at the proper transactional level */
+ int nest_level = GetCurrentTransactionNestLevel();
- /*
- * If there was no relation activity yet, just make one existing message
- * buffer used without slots, causing the next report to tell new
- * xact-counters.
- */
- if (RegularTabStat.tsa_alloc == 0)
- more_tabstat_space(&RegularTabStat);
+ 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 (RegularTabStat.tsa_used == 0)
+ if (pgstat_info != NULL)
{
- RegularTabStat.tsa_used++;
- RegularTabStat.tsa_messages[0]->m_nentries = 0;
+ /* We have to log the effect at the proper transactional level */
+ int nest_level = GetCurrentTransactionNestLevel();
+
+ if (pgstat_info->trans == NULL ||
+ pgstat_info->trans->nest_level != nest_level)
+ add_tabstat_xact_level(pgstat_info, nest_level);
+
+ pgstat_info->trans->tuples_updated++;
+
+ /* t_tuples_hot_updated is nontransactional, so just advance it */
+ if (hot)
+ pgstat_info->t_counts.t_tuples_hot_updated++;
}
}
+/*
+ * pgstat_count_heap_delete - count a tuple deletion
+ */
+void
+pgstat_count_heap_delete(Relation rel)
+{
+ PgStat_TableStatus *pgstat_info = rel->pgstat_info;
-/* ----------
- * pgstat_fetch_stat_dbentry() -
+ if (pgstat_info != NULL)
+ {
+ /* We have to log the effect at the proper transactional level */
+ int nest_level = GetCurrentTransactionNestLevel();
+
+ 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
*
- * 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.
- * ----------
+ * The semantics of this are that we are reporting the nontransactional
+ * recovery of "delta" dead tuples; so t_delta_dead_tuples decreases
+ * rather than increasing, and the change goes straight into the per-table
+ * counter, not into transactional state.
*/
-PgStat_StatDBEntry *
-pgstat_fetch_stat_dbentry(Oid dbid)
+void
+pgstat_update_heap_dead_tuples(Relation rel, int delta)
{
- /*
- * If not done for this transaction, read the statistics collector stats
- * file into some hash tables.
- */
- backend_read_statsfile();
+ PgStat_TableStatus *pgstat_info = rel->pgstat_info;
- /*
- * Lookup the requested database; return NULL if not found
- */
- return (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &dbid,
- HASH_FIND, NULL);
+ if (pgstat_info != NULL)
+ pgstat_info->t_counts.t_delta_dead_tuples -= delta;
}
/* ----------
- * pgstat_fetch_stat_tabentry() -
+ * AtEOXact_PgStat
*
- * 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.
+ * Called from access/transam/xact.c at top-level transaction commit/abort.
* ----------
*/
-PgStat_StatTabEntry *
-pgstat_fetch_stat_tabentry(Oid relid)
+void
+AtEOXact_PgStat(bool isCommit)
{
- Oid dbid;
- PgStat_StatDBEntry *dbentry;
- PgStat_StatTabEntry *tabentry;
+ PgStat_SubXactStatus *xact_state;
/*
- * If not done for this transaction, read the statistics collector stats
- * file into some hash tables.
+ * Count transaction commit or abort. (We use counters, not just bools,
+ * in case the reporting message isn't sent right away.)
*/
- backend_read_statsfile();
+ if (isCommit)
+ pgStatXactCommit++;
+ else
+ pgStatXactRollback++;
/*
- * Lookup our database, then look in its table hash table.
+ * 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.
*/
- dbid = MyDatabaseId;
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &dbid,
- HASH_FIND, NULL);
- if (dbentry != NULL && dbentry->tables != NULL)
+ xact_state = pgStatXactStack;
+ if (xact_state != NULL)
{
- tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
+ 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);
+ /* count attempted actions regardless of commit/abort */
+ tabstat->t_counts.t_tuples_inserted += trans->tuples_inserted;
+ tabstat->t_counts.t_tuples_updated += trans->tuples_updated;
+ tabstat->t_counts.t_tuples_deleted += trans->tuples_deleted;
+ if (isCommit)
+ {
+ /* insert adds a live tuple, delete removes one */
+ tabstat->t_counts.t_delta_live_tuples +=
+ trans->tuples_inserted - trans->tuples_deleted;
+ /* update and delete each create a dead tuple */
+ tabstat->t_counts.t_delta_dead_tuples +=
+ trans->tuples_updated + trans->tuples_deleted;
+ /* insert, update, delete each count as one change event */
+ tabstat->t_counts.t_changed_tuples +=
+ trans->tuples_inserted + trans->tuples_updated +
+ trans->tuples_deleted;
+ }
+ else
+ {
+ /* inserted tuples are dead, deleted tuples are unaffected */
+ tabstat->t_counts.t_delta_dead_tuples +=
+ trans->tuples_inserted + trans->tuples_updated;
+ /* an aborted xact generates no changed_tuple events */
+ }
+ 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_updated += trans->tuples_updated;
+ 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, update top-level tabstat counts, then forget the
+ * subtransaction
+ */
+
+ /* count attempted actions regardless of commit/abort */
+ tabstat->t_counts.t_tuples_inserted += trans->tuples_inserted;
+ tabstat->t_counts.t_tuples_updated += trans->tuples_updated;
+ tabstat->t_counts.t_tuples_deleted += trans->tuples_deleted;
+ /* inserted tuples are dead, deleted tuples are unaffected */
+ tabstat->t_counts.t_delta_dead_tuples +=
+ trans->tuples_inserted + trans->tuples_updated;
+ 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_updated = trans->tuples_updated;
+ 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);
+
+ /* Same math as in AtEOXact_PgStat, commit case */
+ pgstat_info->t_counts.t_tuples_inserted += rec->tuples_inserted;
+ pgstat_info->t_counts.t_tuples_updated += rec->tuples_updated;
+ pgstat_info->t_counts.t_tuples_deleted += rec->tuples_deleted;
+ pgstat_info->t_counts.t_delta_live_tuples +=
+ rec->tuples_inserted - rec->tuples_deleted;
+ pgstat_info->t_counts.t_delta_dead_tuples +=
+ rec->tuples_updated + rec->tuples_deleted;
+ pgstat_info->t_counts.t_changed_tuples +=
+ rec->tuples_inserted + rec->tuples_updated +
+ 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);
+
+ /* Same math as in AtEOXact_PgStat, abort case */
+ pgstat_info->t_counts.t_tuples_inserted += rec->tuples_inserted;
+ pgstat_info->t_counts.t_tuples_updated += rec->tuples_updated;
+ pgstat_info->t_counts.t_tuples_deleted += rec->tuples_deleted;
+ pgstat_info->t_counts.t_delta_dead_tuples +=
+ rec->tuples_inserted + rec->tuples_updated;
+}
+
+
+/* ----------
+ * 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)
}
+/* ----------
+ * 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() -
*
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 *BackendClientHostnameBuffer = NULL;
+static char *BackendAppnameBuffer = NULL;
+static char *BackendActivityBuffer = NULL;
/*
Size size;
size = mul_size(sizeof(PgBackendStatus), MaxBackends);
+ size = add_size(size,
+ mul_size(NAMEDATALEN, MaxBackends));
+ size = add_size(size,
+ mul_size(pgstat_track_activity_query_size, MaxBackends));
+ size = add_size(size,
+ mul_size(NAMEDATALEN, MaxBackends));
return size;
}
/*
- * Initialize the shared status array during postmaster startup.
+ * Initialize the shared status array and several string buffers
+ * during postmaster startup.
*/
void
CreateSharedBackendStatus(void)
{
- Size size = BackendStatusShmemSize();
+ 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);
*/
MemSet(BackendStatusArray, 0, size);
}
+
+ /* Create or attach to the shared appname buffer */
+ size = mul_size(NAMEDATALEN, MaxBackends);
+ BackendAppnameBuffer = (char *)
+ ShmemInitStruct("Backend Application Name Buffer", size, &found);
+
+ if (!found)
+ {
+ MemSet(BackendAppnameBuffer, 0, size);
+
+ /* Initialize st_appname pointers. */
+ buffer = BackendAppnameBuffer;
+ for (i = 0; i < MaxBackends; i++)
+ {
+ BackendStatusArray[i].st_appname = buffer;
+ buffer += NAMEDATALEN;
+ }
+ }
+
+ /* Create or attach to the shared client hostname buffer */
+ size = mul_size(NAMEDATALEN, MaxBackends);
+ BackendClientHostnameBuffer = (char *)
+ ShmemInitStruct("Backend Client Host Name Buffer", size, &found);
+
+ if (!found)
+ {
+ MemSet(BackendClientHostnameBuffer, 0, size);
+
+ /* Initialize st_clienthostname pointers. */
+ buffer = BackendClientHostnameBuffer;
+ for (i = 0; i < MaxBackends; i++)
+ {
+ BackendStatusArray[i].st_clienthostname = buffer;
+ buffer += NAMEDATALEN;
+ }
+ }
+
+ /* 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,
- * and set up an on-proc-exit hook that will clear it again.
- * Called from InitPostgres. MyBackendId and MyDatabaseId must be set.
+ * Initialize this backend's entry in the PgBackendStatus array.
+ * Called from InitPostgres.
+ * MyDatabaseId, session userid, and application_name must be set
+ * (hence, this cannot be combined with pgstat_initialize).
* ----------
*/
void
pgstat_bestart(void)
{
- volatile PgBackendStatus *beentry;
TimestampTz proc_start_timestamp;
Oid userid;
SockAddr clientaddr;
-
- Assert(MyBackendId >= 1 && MyBackendId <= MaxBackends);
- MyBEEntry = &BackendStatusArray[MyBackendId - 1];
+ volatile PgBackendStatus *beentry;
/*
- * To minimize the time spent modifying the entry, fetch all the
- * needed data first.
+ * 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).
/*
* 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.
+ * 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 {
+ 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_clienthostname[0] = '\0';
+ beentry->st_waiting = false;
+ beentry->st_appname[0] = '\0';
beentry->st_activity[0] = '\0';
- /* Also make sure the last byte in the string area is always 0 */
- beentry->st_activity[PGBE_ACTIVITY_SIZE - 1] = '\0';
+ /* Also make sure the last byte in each string area is always 0 */
+ beentry->st_clienthostname[NAMEDATALEN - 1] = '\0';
+ beentry->st_appname[NAMEDATALEN - 1] = '\0';
+ beentry->st_activity[pgstat_track_activity_query_size - 1] = '\0';
beentry->st_changecount++;
Assert((beentry->st_changecount & 1) == 0);
- /*
- * Set up a process-exit hook to clean up.
- */
- on_shmem_exit(pgstat_beshutdown_hook, 0);
+ if (MyProcPort && MyProcPort->remote_hostname)
+ strlcpy(beentry->st_clienthostname, MyProcPort->remote_hostname, NAMEDATALEN);
+
+ /* Update app name to current GUC setting */
+ if (application_name)
+ pgstat_report_appname(application_name);
}
/*
static void
pgstat_beshutdown_hook(int code, Datum arg)
{
- volatile PgBackendStatus *beentry;
+ volatile PgBackendStatus *beentry = MyBEEntry;
- pgstat_report_tabstat();
+ /*
+ * 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.
+ * 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 = MyBEEntry;
beentry->st_changecount++;
beentry->st_procpid = 0; /* mark invalid */
void
pgstat_report_activity(const char *cmd_str)
{
- volatile PgBackendStatus *beentry;
+ volatile PgBackendStatus *beentry = MyBEEntry;
TimestampTz start_timestamp;
int len;
- if (!pgstat_collect_querystring)
+ 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.
+ * 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, PGBE_ACTIVITY_SIZE - 1);
+ 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.
+ * st_changecount before and after. We use a volatile pointer here to
+ * ensure the compiler doesn't try to get cute.
*/
- beentry = MyBEEntry;
beentry->st_changecount++;
beentry->st_activity_start_timestamp = start_timestamp;
Assert((beentry->st_changecount & 1) == 0);
}
-
/* ----------
- * pgstat_read_current_status() -
+ * pgstat_report_appname() -
*
- * Copy the current contents of the PgBackendStatus array to local memory,
- * if not already done in this transaction.
+ * Called to update our application name.
* ----------
*/
-static void
-pgstat_read_current_status(void)
+void
+pgstat_report_appname(const char *appname)
{
- TransactionId topXid = GetTopTransactionId();
- volatile PgBackendStatus *beentry;
- PgBackendStatus *localentry;
- int i;
+ volatile PgBackendStatus *beentry = MyBEEntry;
+ int len;
- Assert(!pgStatRunningInCollector);
- if (TransactionIdEquals(pgStatLocalStatusXact, topXid))
- return; /* already done */
+ if (!beentry)
+ return;
- localBackendStatusTable = (PgBackendStatus *)
- MemoryContextAlloc(TopTransactionContext,
- sizeof(PgBackendStatus) * MaxBackends);
- localNumBackends = 0;
+ /* This should be unnecessary if GUC did its job, but be safe */
+ len = pg_mbcliplen(appname, strlen(appname), NAMEDATALEN - 1);
- beentry = BackendStatusArray;
- localentry = localBackendStatusTable;
- 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;
+ /*
+ * 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++;
- /*
- * XXX if PGBE_ACTIVITY_SIZE is really large, it might be best
- * to use strcpy not memcpy for copying the activity string?
- */
- memcpy(localentry, (char *) beentry, sizeof(PgBackendStatus));
-
- 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++;
- localNumBackends++;
- }
- }
+ memcpy((char *) beentry->st_appname, appname, len);
+ beentry->st_appname[len] = '\0';
- pgStatLocalStatusXact = topXid;
+ beentry->st_changecount++;
+ Assert((beentry->st_changecount & 1) == 0);
}
-
-/* ------------------------------------------------------------
- * Local support functions follow
- * ------------------------------------------------------------
+/*
+ * 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;
-/* ----------
- * pgstat_setheader() -
- *
- * Set common header fields in a statistics message
- * ----------
- */
-static void
-pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype)
-{
- hdr->m_type = mtype;
+ /*
+ * 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_send() -
+ * pgstat_report_waiting() -
*
- * Send out one statistics message to the collector
+ * 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.
* ----------
*/
-static void
-pgstat_send(void *msg, int len)
+void
+pgstat_report_waiting(bool waiting)
{
- if (pgStatSock < 0)
- return;
+ volatile PgBackendStatus *beentry = MyBEEntry;
- ((PgStat_MsgHdr *) msg)->m_size = len;
+ if (!pgstat_track_activities || !beentry)
+ return;
-#ifdef USE_ASSERT_CHECKING
- if (send(pgStatSock, msg, len, 0) < 0)
- elog(LOG, "could not send to statistics collector: %m");
-#else
- send(pgStatSock, msg, len, 0);
- /* We deliberately ignore any error from send() */
-#endif
+ /*
+ * 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;
}
/* ----------
- * PgstatBufferMain() -
- *
- * Start up the statistics buffer process. This is the body of the
- * postmaster child process.
+ * pgstat_read_current_status() -
*
- * The argc/argv parameters are valid only in EXEC_BACKEND case.
+ * Copy the current contents of the PgBackendStatus array to local memory,
+ * if not already done in this transaction.
* ----------
*/
-NON_EXEC_STATIC void
-PgstatBufferMain(int argc, char *argv[])
+static void
+pgstat_read_current_status(void)
{
- IsUnderPostmaster = true; /* we are a postmaster subprocess now */
-
- MyProcPid = getpid(); /* reset MyProcPid */
+ volatile PgBackendStatus *beentry;
+ PgBackendStatus *localtable;
+ PgBackendStatus *localentry;
+ char *localappname,
+ *localactivity;
+ int i;
- /*
- * Ignore all signals usually bound to some action in the postmaster,
- * except for SIGCHLD and SIGQUIT --- see pgstat_recvbuffer.
- */
- pqsignal(SIGHUP, SIG_IGN);
- 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, pgstat_die);
- pqsignal(SIGTTIN, SIG_DFL);
- pqsignal(SIGTTOU, SIG_DFL);
- pqsignal(SIGCONT, SIG_DFL);
- pqsignal(SIGWINCH, SIG_DFL);
- /* unblock will happen in pgstat_recvbuffer */
+ Assert(!pgStatRunningInCollector);
+ if (localBackendStatusTable)
+ return; /* already done */
-#ifdef EXEC_BACKEND
- pgstat_parseArgs(argc, argv);
-#endif
+ pgstat_setup_memcxt();
- /*
- * Start a buffering process to read from the socket, so we have a little
- * more time to process incoming messages.
- *
- * NOTE: the process structure is: postmaster is parent of buffer process
- * is parent of collector process. This way, the buffer can detect
- * collector failure via SIGCHLD, whereas otherwise it wouldn't notice
- * collector failure until it tried to write on the pipe. That would mean
- * that after the postmaster started a new collector, we'd have two buffer
- * processes competing to read from the UDP socket --- not good.
- */
- if (pgpipe(pgStatPipe) < 0)
- ereport(ERROR,
- (errcode_for_socket_access(),
- errmsg("could not create pipe for statistics buffer: %m")));
+ localtable = (PgBackendStatus *)
+ MemoryContextAlloc(pgStatLocalContext,
+ sizeof(PgBackendStatus) * MaxBackends);
+ localappname = (char *)
+ MemoryContextAlloc(pgStatLocalContext,
+ NAMEDATALEN * MaxBackends);
+ localactivity = (char *)
+ MemoryContextAlloc(pgStatLocalContext,
+ pgstat_track_activity_query_size * MaxBackends);
+ localNumBackends = 0;
- /* child becomes collector process */
-#ifdef EXEC_BACKEND
- pgStatCollectorPid = pgstat_forkexec(STAT_PROC_COLLECTOR);
-#else
- pgStatCollectorPid = fork();
-#endif
- switch (pgStatCollectorPid)
+ beentry = BackendStatusArray;
+ localentry = localtable;
+ for (i = 1; i <= MaxBackends; i++)
{
- case -1:
- ereport(ERROR,
- (errmsg("could not fork statistics collector: %m")));
+ /*
+ * 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;
-#ifndef EXEC_BACKEND
- case 0:
- /* child becomes collector process */
- PgstatCollectorMain(0, NULL);
- break;
-#endif
+ localentry->st_procpid = beentry->st_procpid;
+ if (localentry->st_procpid > 0)
+ {
+ memcpy(localentry, (char *) beentry, sizeof(PgBackendStatus));
- default:
- /* parent becomes buffer process */
- closesocket(pgStatPipe[0]);
- pgstat_recvbuffer();
+ /*
+ * strcpy is safe even if the string is modified concurrently,
+ * because there's always a \0 at the end of the buffer.
+ */
+ strcpy(localappname, (char *) beentry->st_appname);
+ localentry->st_appname = localappname;
+ 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++;
+ localappname += NAMEDATALEN;
+ localactivity += pgstat_track_activity_query_size;
+ localNumBackends++;
+ }
}
- exit(0);
+
+ /* Set the pointer only after completion of a valid table */
+ localBackendStatusTable = localtable;
}
/* ----------
- * PgstatCollectorMain() -
+ * pgstat_get_backend_current_activity() -
*
- * Start up the statistics collector itself. This is the body of the
- * postmaster grandchild process.
+ * 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.
*
- * The argc/argv parameters are valid only in EXEC_BACKEND case.
+ * 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.
* ----------
*/
-NON_EXEC_STATIC void
-PgstatCollectorMain(int argc, char *argv[])
+const char *
+pgstat_get_backend_current_activity(int pid, bool checkUser)
{
- PgStat_Msg msg;
- fd_set rfds;
- int readPipe;
- int len = 0;
- struct itimerval timeout;
- bool need_timer = false;
-
- MyProcPid = getpid(); /* reset MyProcPid */
-
- /*
- * Reset signal handling. With the exception of restoring default SIGCHLD
- * and SIGQUIT handling, this is a no-op in the non-EXEC_BACKEND case
- * because we'll have inherited these settings from the buffer process;
- * but it's not a no-op for EXEC_BACKEND.
- */
- pqsignal(SIGHUP, SIG_IGN);
- pqsignal(SIGINT, SIG_IGN);
- pqsignal(SIGTERM, SIG_IGN);
-#ifndef WIN32
- pqsignal(SIGQUIT, SIG_IGN);
-#else
- /* kluge to allow buffer process to kill collector; FIXME */
- pqsignal(SIGQUIT, pgstat_exit);
-#endif
- pqsignal(SIGALRM, force_statwrite);
- 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);
-
-#ifdef EXEC_BACKEND
- pgstat_parseArgs(argc, argv);
-#endif
-
- /* Close unwanted files */
- closesocket(pgStatPipe[1]);
- closesocket(pgStatSock);
-
- /*
- * Identify myself via ps
- */
- init_ps_display("stats collector process", "", "");
- set_ps_display("");
-
- /*
- * Arrange to write the initial status file right away
- */
- need_statwrite = true;
-
- /* Preset the delay between status file writes */
- MemSet(&timeout, 0, sizeof(struct itimerval));
- timeout.it_value.tv_sec = PGSTAT_STAT_INTERVAL / 1000;
- timeout.it_value.tv_usec = PGSTAT_STAT_INTERVAL % 1000;
-
- /*
- * Read in an existing statistics stats file or initialize the stats to
- * zero.
- */
- pgStatRunningInCollector = true;
- pgstat_read_statsfile(&pgStatDBHash, InvalidOid);
-
- readPipe = pgStatPipe[0];
+ PgBackendStatus *beentry;
+ int i;
- /*
- * Process incoming messages and handle all the reporting stuff until
- * there are no more messages.
- */
- for (;;)
+ beentry = BackendStatusArray;
+ for (i = 1; i <= MaxBackends; i++)
{
/*
- * If time to write the stats file, do so. Note that the alarm
- * interrupt isn't re-enabled immediately, but only after we next
- * receive a stats message; so no cycles are wasted when there is
- * nothing going on.
+ * 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.
*/
- if (need_statwrite)
+ volatile PgBackendStatus *vbeentry = beentry;
+ bool found;
+
+ for (;;)
{
- pgstat_write_statsfile();
- need_statwrite = false;
- need_timer = true;
- }
+ int save_changecount = vbeentry->st_changecount;
- /*
- * Setup the descriptor set for select(2)
- */
- FD_ZERO(&rfds);
- FD_SET(readPipe, &rfds);
+ found = (vbeentry->st_procpid == pid);
- /*
- * Now wait for something to do.
- */
- if (select(readPipe + 1, &rfds, NULL, NULL, NULL) < 0)
- {
- if (errno == EINTR)
- continue;
- ereport(ERROR,
- (errcode_for_socket_access(),
- errmsg("select() failed in statistics collector: %m")));
+ if (save_changecount == vbeentry->st_changecount &&
+ (save_changecount & 1) == 0)
+ break;
+
+ /* Make sure we can break out of loop if stuck... */
+ CHECK_FOR_INTERRUPTS();
}
- /*
- * Check if there is a new statistics message to collect.
- */
- if (FD_ISSET(readPipe, &rfds))
+ if (found)
{
- /*
- * We may need to issue multiple read calls in case the buffer
- * process didn't write the message in a single write, which is
- * possible since it dumps its buffer bytewise. In any case, we'd
- * need two reads since we don't know the message length
- * initially.
- */
- int nread = 0;
- int targetlen = sizeof(PgStat_MsgHdr); /* initial */
- bool pipeEOF = false;
+ /* 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;
+ }
- while (nread < targetlen)
- {
- len = piperead(readPipe, ((char *) &msg) + nread,
- targetlen - nread);
- if (len < 0)
- {
- if (errno == EINTR)
- continue;
- ereport(ERROR,
- (errcode_for_socket_access(),
- errmsg("could not read from statistics collector pipe: %m")));
- }
- if (len == 0) /* EOF on the pipe! */
- {
- pipeEOF = true;
- break;
- }
- nread += len;
- if (nread == sizeof(PgStat_MsgHdr))
- {
- /* we have the header, compute actual msg length */
- targetlen = msg.msg_hdr.m_size;
- if (targetlen < (int) sizeof(PgStat_MsgHdr) ||
- targetlen > (int) sizeof(msg))
- {
- /*
- * Bogus message length implies that we got out of
- * sync with the buffer process somehow. Abort so that
- * we can restart both processes.
- */
- ereport(ERROR,
- (errmsg("invalid statistics message length")));
- }
- }
- }
+ beentry++;
+ }
- /*
- * EOF on the pipe implies that the buffer process exited. Fall
- * out of outer loop.
- */
- if (pipeEOF)
- break;
+ /* If we get here, caller is in error ... */
+ return "<backend information not available>";
+}
- /*
- * Distribute the message to the specific function handling it.
- */
- switch (msg.msg_hdr.m_type)
- {
- case PGSTAT_MTYPE_DUMMY:
- break;
- case PGSTAT_MTYPE_TABSTAT:
- pgstat_recv_tabstat((PgStat_MsgTabstat *) &msg, nread);
- break;
+/* ------------------------------------------------------------
+ * Local support functions follow
+ * ------------------------------------------------------------
+ */
- case PGSTAT_MTYPE_TABPURGE:
- pgstat_recv_tabpurge((PgStat_MsgTabpurge *) &msg, nread);
- break;
- case PGSTAT_MTYPE_DROPDB:
- pgstat_recv_dropdb((PgStat_MsgDropdb *) &msg, nread);
- break;
+/* ----------
+ * pgstat_setheader() -
+ *
+ * Set common header fields in a statistics message
+ * ----------
+ */
+static void
+pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype)
+{
+ hdr->m_type = mtype;
+}
- case PGSTAT_MTYPE_RESETCOUNTER:
- pgstat_recv_resetcounter((PgStat_MsgResetcounter *) &msg,
- nread);
- break;
- case PGSTAT_MTYPE_AUTOVAC_START:
- pgstat_recv_autovac((PgStat_MsgAutovacStart *) &msg, nread);
- break;
+/* ----------
+ * pgstat_send() -
+ *
+ * Send out one statistics message to the collector
+ * ----------
+ */
+static void
+pgstat_send(void *msg, int len)
+{
+ int rc;
- case PGSTAT_MTYPE_VACUUM:
- pgstat_recv_vacuum((PgStat_MsgVacuum *) &msg, nread);
- break;
+ if (pgStatSock == PGINVALID_SOCKET)
+ return;
- case PGSTAT_MTYPE_ANALYZE:
- pgstat_recv_analyze((PgStat_MsgAnalyze *) &msg, nread);
- break;
+ ((PgStat_MsgHdr *) msg)->m_size = len;
- default:
- break;
- }
+ /* We'll retry after EINTR, but ignore all other failures */
+ do
+ {
+ rc = send(pgStatSock, msg, len, 0);
+ } while (rc < 0 && errno == EINTR);
- /*
- * If this is the first message after we wrote the stats file the
- * last time, enable the alarm interrupt to make it be written
- * again later.
- */
- if (need_timer)
- {
- if (setitimer(ITIMER_REAL, &timeout, NULL))
- ereport(ERROR,
- (errmsg("could not set statistics collector timer: %m")));
- need_timer = false;
- }
- }
+#ifdef USE_ASSERT_CHECKING
+ /* In debug builds, log send failures ... */
+ if (rc < 0)
+ elog(LOG, "could not send to statistics collector: %m");
+#endif
+}
- /*
- * Note that we do NOT check for postmaster exit inside the loop; only
- * EOF on the buffer pipe causes us to fall out. This ensures we
- * don't exit prematurely if there are still a few messages in the
- * buffer or pipe at postmaster shutdown.
- */
- }
+/* ----------
+ * 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;
/*
- * Okay, we saw EOF on the buffer pipe, so there are no more messages to
- * process. If the buffer process quit because of postmaster shutdown, we
- * want to save the final stats to reuse at next startup. But if the
- * buffer process failed, it seems best not to (there may even now be a
- * new collector firing up, and we don't want it to read a
- * partially-rewritten stats file).
+ * 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 (!PostmasterIsAlive(false))
- pgstat_write_statsfile();
-}
+ 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));
-/* SIGALRM signal handler for collector process */
-static void
-force_statwrite(SIGNAL_ARGS)
-{
- need_statwrite = true;
+ /*
+ * Clear out the statistics buffer, so it can be re-used.
+ */
+ MemSet(&BgWriterStats, 0, sizeof(BgWriterStats));
}
/* ----------
- * pgstat_recvbuffer() -
+ * PgstatCollectorMain() -
+ *
+ * Start up the statistics collector process. This is the body of the
+ * postmaster child process.
*
- * This is the body of the separate buffering process. Its only
- * purpose is to receive messages from the UDP socket as fast as
- * possible and forward them over a pipe into the collector itself.
- * If the collector is slow to absorb messages, they are buffered here.
+ * The argc/argv parameters are valid only in EXEC_BACKEND case.
* ----------
*/
-static void
-pgstat_recvbuffer(void)
+NON_EXEC_STATIC void
+PgstatCollectorMain(int argc, char *argv[])
{
- fd_set rfds;
- fd_set wfds;
- struct timeval timeout;
- int writePipe = pgStatPipe[1];
- int maxfd;
int len;
- int xfr;
- int frm;
- PgStat_Msg input_buffer;
- char *msgbuffer;
- int msg_send = 0; /* next send index in buffer */
- int msg_recv = 0; /* next receive index */
- int msg_have = 0; /* number of bytes stored */
- bool overflow = false;
+ 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 */
/*
- * Identify myself via ps
+ * 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.)
*/
- init_ps_display("stats buffer process", "", "");
- set_ps_display("");
+#ifdef HAVE_SETSID
+ if (setsid() < 0)
+ elog(FATAL, "setsid() failed: %m");
+#endif
/*
- * We want to die if our child collector process does. There are two ways
- * we might notice that it has died: receive SIGCHLD, or get a write
- * failure on the pipe leading to the child. We can set SIGPIPE to kill
- * us here. Our SIGCHLD handler was already set up before we forked (must
- * do it that way, else it's a race condition).
+ * Ignore all signals usually bound to some action in the postmaster,
+ * except SIGQUIT.
*/
- pqsignal(SIGPIPE, SIG_DFL);
+ 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);
/*
- * Set the write pipe to nonblock mode, so that we cannot block when the
- * collector falls behind.
+ * Identify myself via ps
*/
- if (!pg_set_noblock(writePipe))
- ereport(ERROR,
- (errcode_for_socket_access(),
- errmsg("could not set statistics collector pipe to nonblocking mode: %m")));
+ 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);
/*
- * Allocate the message buffer
+ * Setup the descriptor set for select(2). Since only one bit in the set
+ * ever changes, we need not repeat FD_ZERO each time.
*/
- msgbuffer = (char *) palloc(PGSTAT_RECVBUFFERSZ);
+#if !defined(HAVE_POLL) && !defined(WIN32)
+ FD_ZERO(&rfds);
+#endif
/*
- * Loop forever
+ * 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 (;;)
{
- FD_ZERO(&rfds);
- FD_ZERO(&wfds);
- maxfd = -1;
+ int got_data;
/*
- * As long as we have buffer space we add the socket to the read
- * descriptor set.
+ * Quit if we get SIGQUIT from the postmaster.
*/
- if (msg_have <= (int) (PGSTAT_RECVBUFFERSZ - sizeof(PgStat_Msg)))
- {
- FD_SET(pgStatSock, &rfds);
- maxfd = pgStatSock;
- overflow = false;
- }
- else
+ if (need_exit)
+ break;
+
+ /*
+ * Reload configuration if we got SIGHUP from the postmaster.
+ */
+ if (got_SIGHUP)
{
- if (!overflow)
- {
- ereport(LOG,
- (errmsg("statistics buffer is full")));
- overflow = true;
- }
+ ProcessConfigFile(PGC_SIGHUP);
+ got_SIGHUP = false;
}
/*
- * If we have messages to write out, we add the pipe to the write
- * descriptor set.
+ * 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.
*/
- if (msg_have > 0)
+#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)
{
- FD_SET(writePipe, &wfds);
- if (writePipe > maxfd)
- maxfd = writePipe;
+ 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);
+
/*
- * Wait for some work to do; but not for more than 10 seconds. (This
- * determines how quickly we will shut down after an ungraceful
- * postmaster termination; so it needn't be very fast.)
- *
- * struct timeout is modified by select() on some operating systems,
+ * timeout struct is modified by select() on some operating systems,
* so re-fill it each time.
*/
- timeout.tv_sec = 10;
- timeout.tv_usec = 0;
+ sel_timeout.tv_sec = PGSTAT_SELECT_TIMEOUT;
+ sel_timeout.tv_usec = 0;
- if (select(maxfd + 1, &rfds, &wfds, NULL, &timeout) < 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 buffer: %m")));
+ 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 (FD_ISSET(pgStatSock, &rfds))
+ if (got_data)
{
- len = recv(pgStatSock, (char *) &input_buffer,
+ 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
/*
* The received length must match the length in the header
*/
- if (input_buffer.msg_hdr.m_size != len)
+ if (msg.msg_hdr.m_size != len)
continue;
/*
- * O.K. - we accept this message. Copy it to the circular
- * msgbuffer.
+ * O.K. - we accept this message. Process it.
*/
- frm = 0;
- while (len > 0)
+ switch (msg.msg_hdr.m_type)
{
- xfr = PGSTAT_RECVBUFFERSZ - msg_recv;
- if (xfr > len)
- xfr = len;
- Assert(xfr > 0);
- memcpy(msgbuffer + msg_recv,
- ((char *) &input_buffer) + frm,
- xfr);
- msg_recv += xfr;
- if (msg_recv == PGSTAT_RECVBUFFERSZ)
- msg_recv = 0;
- msg_have += xfr;
- frm += xfr;
- len -= xfr;
+ 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_RESETSHAREDCOUNTER:
+ pgstat_recv_resetsharedcounter(
+ (PgStat_MsgResetsharedcounter *) &msg,
+ len);
+ break;
+
+ case PGSTAT_MTYPE_RESETSINGLECOUNTER:
+ pgstat_recv_resetsinglecounter(
+ (PgStat_MsgResetsinglecounter *) &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;
+
+ case PGSTAT_MTYPE_RECOVERYCONFLICT:
+ pgstat_recv_recoveryconflict((PgStat_MsgRecoveryConflict *) &msg, len);
+ break;
+
+ default:
+ break;
}
}
-
- /*
- * If the collector is ready to receive, write some data into his
- * pipe. We may or may not be able to write all that we have.
- *
- * NOTE: if what we have is less than PIPE_BUF bytes but more than the
- * space available in the pipe buffer, most kernels will refuse to
- * write any of it, and will return EAGAIN. This means we will
- * busy-loop until the situation changes (either because the collector
- * caught up, or because more data arrives so that we have more than
- * PIPE_BUF bytes buffered). This is not good, but is there any way
- * around it? We have no way to tell when the collector has caught
- * up...
- */
- if (FD_ISSET(writePipe, &wfds))
+ else
{
- xfr = PGSTAT_RECVBUFFERSZ - msg_send;
- if (xfr > msg_have)
- xfr = msg_have;
- Assert(xfr > 0);
- len = pipewrite(writePipe, msgbuffer + msg_send, xfr);
- if (len < 0)
- {
- if (errno == EINTR || errno == EAGAIN)
- continue; /* not enough space in pipe */
- ereport(ERROR,
- (errcode_for_socket_access(),
- errmsg("could not write to statistics collector pipe: %m")));
- }
- /* NB: len < xfr is okay */
- msg_send += len;
- if (msg_send == PGSTAT_RECVBUFFERSZ)
- msg_send = 0;
- msg_have -= len;
+ /*
+ * We can only get here if the select/poll timeout elapsed. Check
+ * for postmaster death.
+ */
+ if (!PostmasterIsAlive(true))
+ break;
}
+ } /* end of message-processing loop */
- /*
- * Make sure we forwarded all messages before we check for postmaster
- * termination.
- */
- if (msg_have != 0 || FD_ISSET(pgStatSock, &rfds))
- continue;
+ /*
+ * Save the final stats to reuse at next startup.
+ */
+ pgstat_write_statsfile(true);
- /*
- * If the postmaster has terminated, we die too. (This is no longer
- * the normal exit path, however.)
- */
- if (!PostmasterIsAlive(true))
- exit(0);
- }
+ exit(0);
}
-/* SIGQUIT signal handler for buffer process */
+
+/* SIGQUIT signal handler for collector process */
static void
pgstat_exit(SIGNAL_ARGS)
{
- /*
- * For now, we just nail the doors shut and get out of town. It might be
- * cleaner to allow any pending messages to be sent, but that creates a
- * tradeoff against speed of exit.
- */
-
- /*
- * If running in bufferer, kill our collector as well. On some broken
- * win32 systems, it does not shut down automatically because of issues
- * with socket inheritance. XXX so why not fix the socket inheritance...
- */
-#ifdef WIN32
- if (pgStatCollectorPid > 0)
- kill(pgStatCollectorPid, SIGQUIT);
-#endif
- exit(0);
+ need_exit = true;
}
-/* SIGCHLD signal handler for buffer process */
+/* SIGHUP handler for collector process */
static void
-pgstat_die(SIGNAL_ARGS)
+pgstat_sighup_handler(SIGNAL_ARGS)
{
- exit(1);
+ got_SIGHUP = true;
}
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;
+ result->n_conflict_tablespace = 0;
+ result->n_conflict_lock = 0;
+ result->n_conflict_snapshot = 0;
+ result->n_conflict_bufferpin = 0;
+ result->n_conflict_startup_deadlock = 0;
+
+ result->stat_reset_timestamp = GetCurrentTimestamp();
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
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->changes_since_analyze = 0;
+ result->blocks_fetched = 0;
+ result->blocks_hit = 0;
+ result->vacuum_timestamp = 0;
+ result->vacuum_count = 0;
+ result->autovac_vacuum_timestamp = 0;
+ result->autovac_vacuum_count = 0;
+ result->analyze_timestamp = 0;
+ result->analyze_count = 0;
+ result->autovac_analyze_timestamp = 0;
+ result->autovac_analyze_count = 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(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 = fopen(PGSTAT_STAT_TMPFILE, PG_BINARY_W);
+ fpout = AllocateFile(tmpfile, PG_BINARY_W);
if (fpout == NULL)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not open temporary statistics file \"%s\": %m",
- PGSTAT_STAT_TMPFILE)));
+ 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.
*/
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 pointer since it's of no use to any
- * other process.
+ * 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);
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
*/
{
ereport(LOG,
(errcode_for_file_access(),
- errmsg("could not write temporary statistics file \"%s\": %m",
- PGSTAT_STAT_TMPFILE)));
- fclose(fpout);
- unlink(PGSTAT_STAT_TMPFILE);
+ errmsg("could not write temporary statistics file \"%s\": %m",
+ tmpfile)));
+ FreeFile(fpout);
+ unlink(tmpfile);
}
- else if (fclose(fpout) < 0)
+ else if (FreeFile(fpout) < 0)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not close temporary statistics file \"%s\": %m",
- PGSTAT_STAT_TMPFILE)));
- unlink(PGSTAT_STAT_TMPFILE);
+ tmpfile)));
+ unlink(tmpfile);
}
- else if (rename(PGSTAT_STAT_TMPFILE, PGSTAT_STAT_FILENAME) < 0)
+ else if (rename(tmpfile, statfile) < 0)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not rename temporary statistics file \"%s\" to \"%s\": %m",
- PGSTAT_STAT_TMPFILE, PGSTAT_STAT_FILENAME)));
- unlink(PGSTAT_STAT_TMPFILE);
+ tmpfile, statfile)));
+ unlink(tmpfile);
+ }
+ else
+ {
+ /*
+ * Successful write, so update last_statwrite.
+ */
+ last_statwrite = globalStats.stats_timestamp;
+
+ /*
+ * If there is clock skew between backends and the collector, we could
+ * receive a stats request time that's in the future. If so, complain
+ * and reset last_statrequest. Resetting ensures that no inquiry
+ * message can cause more than one stats file write to occur.
+ */
+ if (last_statrequest > last_statwrite)
+ {
+ char *reqtime;
+ char *mytime;
+
+ /* Copy because timestamptz_to_str returns a static buffer */
+ reqtime = pstrdup(timestamptz_to_str(last_statrequest));
+ mytime = pstrdup(timestamptz_to_str(last_statwrite));
+ elog(LOG, "last_statrequest %s is later than collector's time %s",
+ reqtime, mytime);
+ pfree(reqtime);
+ pfree(mytime);
+
+ last_statrequest = last_statwrite;
+ }
}
+
+ if (permanent)
+ unlink(pgstat_stat_filename);
}
* databases' hash table (whose entries point to the tables' hash tables).
* ----------
*/
-static void
-pgstat_read_statsfile(HTAB **dbhash, Oid onlydb)
+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;
- MemoryContext use_mcxt;
- int mcxt_flags;
+ const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
/*
- * If running in the collector or the autovacuum process, we use the
- * DynaHashCxt memory context. If running in a backend, we use the
- * TopTransactionContext instead, so the caller must only know the last
- * XactId when this call happened to know if his tables are still valid or
- * already gone!
+ * The tables will live in pgStatLocalContext.
*/
- if (pgStatRunningInCollector || IsAutoVacuumProcess())
- {
- use_mcxt = NULL;
- mcxt_flags = 0;
- }
- else
- {
- use_mcxt = TopTransactionContext;
- mcxt_flags = HASH_CONTEXT;
- }
+ pgstat_setup_memcxt();
/*
* Create the DB hashtable
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(PgStat_StatDBEntry);
hash_ctl.hash = oid_hash;
- hash_ctl.hcxt = use_mcxt;
- *dbhash = hash_create("Databases hash", PGSTAT_DB_HASH_SIZE, &hash_ctl,
- HASH_ELEM | HASH_FUNCTION | mcxt_flags);
+ 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));
+
+ /*
+ * Set the current timestamp (will be kept only in case we can't load an
+ * existing statsfile.
+ */
+ globalStats.stat_reset_timestamp = GetCurrentTimestamp();
/*
* 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.
+ *
+ * ENOENT is a possibility if the stats collector is not running or has
+ * not yet written the stats file the first time. Any other failure
+ * condition is suspicious.
*/
- if ((fpin = AllocateFile(PGSTAT_STAT_FILENAME, PG_BINARY_R)) == NULL)
- return;
+ if ((fpin = AllocateFile(statfile, PG_BINARY_R)) == NULL)
+ {
+ if (errno != ENOENT)
+ ereport(pgStatRunningInCollector ? LOG : WARNING,
+ (errcode_for_file_access(),
+ errmsg("could not open statistics file \"%s\": %m",
+ statfile)));
+ return dbhash;
+ }
/*
* Verify it's of the expected format.
|| format_id != PGSTAT_FILE_FORMAT_ID)
{
ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted pgstat.stat file")));
+ (errmsg("corrupted statistics file \"%s\"", statfile)));
+ goto done;
+ }
+
+ /*
+ * Read global stats struct
+ */
+ if (fread(&globalStats, 1, sizeof(globalStats), fpin) != sizeof(globalStats))
+ {
+ ereport(pgStatRunningInCollector ? LOG : WARNING,
+ (errmsg("corrupted statistics file \"%s\"", statfile)));
goto done;
}
{
/*
* 'D' A PgStat_StatDBEntry struct describing a database
- * follows. Subsequently, zero to many 'T' entries will follow
- * until a 'd' is encountered.
+ * 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")));
+ (errmsg("corrupted statistics file \"%s\"",
+ statfile)));
goto done;
}
/*
* Add to the DB hash
*/
- dbentry = (PgStat_StatDBEntry *) hash_search(*dbhash,
+ dbentry = (PgStat_StatDBEntry *) hash_search(dbhash,
(void *) &dbbuf.databaseid,
HASH_ENTER,
&found);
if (found)
{
ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted pgstat.stat file")));
+ (errmsg("corrupted statistics file \"%s\"",
+ statfile)));
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
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
hash_ctl.hash = oid_hash;
- hash_ctl.hcxt = use_mcxt;
+ hash_ctl.hcxt = pgStatLocalContext;
dbentry->tables = hash_create("Per-database table",
PGSTAT_TAB_HASH_SIZE,
&hash_ctl,
- HASH_ELEM | HASH_FUNCTION | mcxt_flags);
+ 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 'T's add entries to this database's
- * tables hash table.
+ * Arrange that following records add entries to this
+ * database's hash tables.
*/
tabhash = dbentry->tables;
+ funchash = dbentry->functions;
break;
/*
*/
case 'd':
tabhash = NULL;
+ funchash = NULL;
break;
/*
fpin) != sizeof(PgStat_StatTabEntry))
{
ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted pgstat.stat file")));
+ (errmsg("corrupted statistics file \"%s\"",
+ statfile)));
goto done;
}
/*
* Skip if table belongs to a not requested database.
*/
- if (tabhash == NULL)
+ if (tabhash == NULL)
+ break;
+
+ tabentry = (PgStat_StatTabEntry *) hash_search(tabhash,
+ (void *) &tabbuf.tableid,
+ HASH_ENTER, &found);
+
+ if (found)
+ {
+ ereport(pgStatRunningInCollector ? LOG : WARNING,
+ (errmsg("corrupted statistics file \"%s\"",
+ statfile)));
+ 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 statistics file \"%s\"",
+ statfile)));
+ goto done;
+ }
+
+ /*
+ * Skip if function belongs to a not requested database.
+ */
+ if (funchash == NULL)
break;
- tabentry = (PgStat_StatTabEntry *) hash_search(tabhash,
- (void *) &tabbuf.tableid,
+ funcentry = (PgStat_StatFuncEntry *) hash_search(funchash,
+ (void *) &funcbuf.functionid,
HASH_ENTER, &found);
if (found)
{
ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted pgstat.stat file")));
+ (errmsg("corrupted statistics file \"%s\"",
+ statfile)));
goto done;
}
- memcpy(tabentry, &tabbuf, sizeof(tabbuf));
+ memcpy(funcentry, &funcbuf, sizeof(funcbuf));
break;
/*
default:
ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted pgstat.stat file")));
+ (errmsg("corrupted statistics file \"%s\"",
+ statfile)));
goto done;
}
}
done:
FreeFile(fpin);
+
+ if (permanent)
+ unlink(PGSTAT_STAT_PERMANENT_FILENAME);
+
+ return dbhash;
}
-/*
- * If not done for this transaction, read the statistics collector
- * stats file into some hash tables.
- *
- * Because we store the tables in TopTransactionContext, the result
- * is good for the entire current main transaction.
+/* ----------
+ * pgstat_read_statsfile_timestamp() -
*
- * Inside the autovacuum process, the statfile is assumed to be valid
- * "forever", that is one iteration, within one database. This means
- * we only consider the statistics as they were when the autovacuum
- * iteration started.
+ * Attempt to fetch the timestamp of an existing stats file.
+ * Returns TRUE if successful (timestamp is stored at *ts).
+ * ----------
*/
-static void
-backend_read_statsfile(void)
+static bool
+pgstat_read_statsfile_timestamp(bool permanent, TimestampTz *ts)
{
- if (IsAutoVacuumProcess())
+ 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. As above, anything but ENOENT is worthy
+ * of complaining about.
+ */
+ if ((fpin = AllocateFile(statfile, PG_BINARY_R)) == NULL)
+ {
+ if (errno != ENOENT)
+ ereport(pgStatRunningInCollector ? LOG : WARNING,
+ (errcode_for_file_access(),
+ errmsg("could not open statistics file \"%s\": %m",
+ statfile)));
+ 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)
+ {
+ ereport(pgStatRunningInCollector ? LOG : WARNING,
+ (errmsg("corrupted statistics file \"%s\"", statfile)));
+ FreeFile(fpin);
+ return false;
+ }
+
+ /*
+ * Read global stats struct
+ */
+ if (fread(&myGlobalStats, 1, sizeof(myGlobalStats), fpin) != sizeof(myGlobalStats))
{
- /* already read it? */
- if (pgStatDBHash)
- return;
- Assert(!pgStatRunningInCollector);
- pgstat_read_statsfile(&pgStatDBHash, InvalidOid);
+ ereport(pgStatRunningInCollector ? LOG : WARNING,
+ (errmsg("corrupted statistics file \"%s\"", statfile)));
+ 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++)
{
- TransactionId topXid = GetTopTransactionId();
+ TimestampTz file_ts = 0;
- if (!TransactionIdEquals(pgStatDBHashXact, topXid))
- {
- Assert(!pgStatRunningInCollector);
- pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId);
- pgStatDBHashXact = topXid;
- }
+ 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() -
*
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;
*/
for (i = 0; i < msg->m_nentries; i++)
{
+ PgStat_TableEntry *tabmsg = &(msg->m_entry[i]);
+
tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
- (void *) &(tabmsg[i].t_id),
+ (void *) &(tabmsg->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_numscans;
- tabentry->tuples_returned = tabmsg[i].t_tuples_returned;
- tabentry->tuples_fetched = tabmsg[i].t_tuples_fetched;
- tabentry->tuples_inserted = tabmsg[i].t_tuples_inserted;
- tabentry->tuples_updated = tabmsg[i].t_tuples_updated;
- tabentry->tuples_deleted = tabmsg[i].t_tuples_deleted;
-
- tabentry->n_live_tuples = tabmsg[i].t_tuples_inserted;
- tabentry->n_dead_tuples = tabmsg[i].t_tuples_updated +
- tabmsg[i].t_tuples_deleted;
- tabentry->last_anl_tuples = 0;
+ tabentry->numscans = tabmsg->t_counts.t_numscans;
+ tabentry->tuples_returned = tabmsg->t_counts.t_tuples_returned;
+ tabentry->tuples_fetched = tabmsg->t_counts.t_tuples_fetched;
+ tabentry->tuples_inserted = tabmsg->t_counts.t_tuples_inserted;
+ tabentry->tuples_updated = tabmsg->t_counts.t_tuples_updated;
+ tabentry->tuples_deleted = tabmsg->t_counts.t_tuples_deleted;
+ tabentry->tuples_hot_updated = tabmsg->t_counts.t_tuples_hot_updated;
+ tabentry->n_live_tuples = tabmsg->t_counts.t_delta_live_tuples;
+ tabentry->n_dead_tuples = tabmsg->t_counts.t_delta_dead_tuples;
+ tabentry->changes_since_analyze = tabmsg->t_counts.t_changed_tuples;
+ tabentry->blocks_fetched = tabmsg->t_counts.t_blocks_fetched;
+ tabentry->blocks_hit = tabmsg->t_counts.t_blocks_hit;
+
tabentry->vacuum_timestamp = 0;
+ tabentry->vacuum_count = 0;
tabentry->autovac_vacuum_timestamp = 0;
+ tabentry->autovac_vacuum_count = 0;
tabentry->analyze_timestamp = 0;
+ tabentry->analyze_count = 0;
tabentry->autovac_analyze_timestamp = 0;
-
- tabentry->blocks_fetched = tabmsg[i].t_blocks_fetched;
- tabentry->blocks_hit = tabmsg[i].t_blocks_hit;
+ tabentry->autovac_analyze_count = 0;
}
else
{
/*
* Otherwise add the values to the existing entry.
*/
- tabentry->numscans += tabmsg[i].t_numscans;
- tabentry->tuples_returned += tabmsg[i].t_tuples_returned;
- tabentry->tuples_fetched += tabmsg[i].t_tuples_fetched;
- tabentry->tuples_inserted += tabmsg[i].t_tuples_inserted;
- tabentry->tuples_updated += tabmsg[i].t_tuples_updated;
- tabentry->tuples_deleted += tabmsg[i].t_tuples_deleted;
-
- tabentry->n_live_tuples += tabmsg[i].t_tuples_inserted;
- tabentry->n_dead_tuples += tabmsg[i].t_tuples_updated +
- tabmsg[i].t_tuples_deleted;
-
- tabentry->blocks_fetched += tabmsg[i].t_blocks_fetched;
- tabentry->blocks_hit += tabmsg[i].t_blocks_hit;
+ tabentry->numscans += tabmsg->t_counts.t_numscans;
+ tabentry->tuples_returned += tabmsg->t_counts.t_tuples_returned;
+ tabentry->tuples_fetched += tabmsg->t_counts.t_tuples_fetched;
+ tabentry->tuples_inserted += tabmsg->t_counts.t_tuples_inserted;
+ tabentry->tuples_updated += tabmsg->t_counts.t_tuples_updated;
+ tabentry->tuples_deleted += tabmsg->t_counts.t_tuples_deleted;
+ tabentry->tuples_hot_updated += tabmsg->t_counts.t_tuples_hot_updated;
+ tabentry->n_live_tuples += tabmsg->t_counts.t_delta_live_tuples;
+ tabentry->n_dead_tuples += tabmsg->t_counts.t_delta_dead_tuples;
+ tabentry->changes_since_analyze += tabmsg->t_counts.t_changed_tuples;
+ tabentry->blocks_fetched += tabmsg->t_counts.t_blocks_fetched;
+ tabentry->blocks_hit += tabmsg->t_counts.t_blocks_hit;
}
+ /* Clamp n_live_tuples in case of negative delta_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);
+
/*
- * And add the block IO to the database entry.
+ * Add per-table stats to the per-database entry, too.
*/
- dbentry->n_blocks_fetched += tabmsg[i].t_blocks_fetched;
- dbentry->n_blocks_hit += tabmsg[i].t_blocks_hit;
+ dbentry->n_tuples_returned += tabmsg->t_counts.t_tuples_returned;
+ dbentry->n_tuples_fetched += tabmsg->t_counts.t_tuples_fetched;
+ dbentry->n_tuples_inserted += tabmsg->t_counts.t_tuples_inserted;
+ dbentry->n_tuples_updated += tabmsg->t_counts.t_tuples_updated;
+ dbentry->n_tuples_deleted += tabmsg->t_counts.t_tuples_deleted;
+ dbentry->n_blocks_fetched += tabmsg->t_counts.t_blocks_fetched;
+ dbentry->n_blocks_hit += tabmsg->t_counts.t_blocks_hit;
}
}
{
if (dbentry->tables != NULL)
hash_destroy(dbentry->tables);
+ if (dbentry->functions != NULL)
+ hash_destroy(dbentry->functions);
if (hash_search(pgStatDBHash,
(void *) &(dbentry->databaseid),
*/
if (dbentry->tables != NULL)
hash_destroy(dbentry->tables);
+ if (dbentry->functions != NULL)
+ hash_destroy(dbentry->functions);
dbentry->tables = NULL;
+ dbentry->functions = NULL;
+
+ /*
+ * Reset database-level stats too. This should match the initialization
+ * code in pgstat_get_db_entry().
+ */
dbentry->n_xact_commit = 0;
dbentry->n_xact_rollback = 0;
dbentry->n_blocks_fetched = 0;
dbentry->n_blocks_hit = 0;
+ dbentry->n_tuples_returned = 0;
+ dbentry->n_tuples_fetched = 0;
+ dbentry->n_tuples_inserted = 0;
+ dbentry->n_tuples_updated = 0;
+ dbentry->n_tuples_deleted = 0;
+ dbentry->last_autovac_time = 0;
+
+ dbentry->stat_reset_timestamp = GetCurrentTimestamp();
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
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() -
+ * pgstat_recv_resetshared() -
*
- * Process an autovacuum signalling message.
+ * Reset some shared statistics of the cluster.
* ----------
*/
static void
-pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len)
+pgstat_recv_resetsharedcounter(PgStat_MsgResetsharedcounter *msg, int len)
{
- PgStat_StatDBEntry *dbentry;
+ if (msg->m_resettarget == RESET_BGWRITER)
+ {
+ /* Reset the global background writer statistics for the cluster. */
+ memset(&globalStats, 0, sizeof(globalStats));
+ globalStats.stat_reset_timestamp = GetCurrentTimestamp();
+ }
/*
- * Lookup the database in the hashtable. Don't create the entry if it
- * doesn't exist, because autovacuum may be processing a template
- * database. If this isn't the case, the database is most likely to have
- * an entry already. (If it doesn't, not much harm is done anyway --
- * it'll get created as soon as somebody actually uses the database.)
+ * Presumably the sender of this message validated the target, don't
+ * complain here if it's not valid
*/
+}
+
+/* ----------
+ * pgstat_recv_resetsinglecounter() -
+ *
+ * Reset a statistics for a single object
+ * ----------
+ */
+static void
+pgstat_recv_resetsinglecounter(PgStat_MsgResetsinglecounter *msg, int len)
+{
+ PgStat_StatDBEntry *dbentry;
+
dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
- if (dbentry == NULL)
+
+ if (!dbentry)
return;
+ /* Set the reset timestamp for the whole database */
+ dbentry->stat_reset_timestamp = GetCurrentTimestamp();
+
+ /* Remove object if it exists, ignore it if not */
+ if (msg->m_resettype == RESET_TABLE)
+ (void) hash_search(dbentry->tables, (void *) &(msg->m_objectid),
+ HASH_REMOVE, NULL);
+ else if (msg->m_resettype == RESET_FUNCTION)
+ (void) hash_search(dbentry->functions, (void *) &(msg->m_objectid),
+ HASH_REMOVE, NULL);
+}
+
+/* ----------
+ * 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 entry.
+ * 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_StatTabEntry *tabentry;
/*
- * Don't create either the database or table entry if it doesn't already
- * exist. This avoids bloating the stats with entries for stuff that is
- * only touched by vacuum and not by live operations.
+ * Store the data in the table's hashtable entry.
*/
- dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
- if (dbentry == NULL)
- return;
+ dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
- tabentry = hash_search(dbentry->tables, &(msg->m_tableoid),
- HASH_FIND, NULL);
- if (tabentry == NULL)
- return;
+ 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;
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_autovacuum)
{
- tabentry->last_anl_tuples = msg->m_tuples;
- if (msg->m_autovacuum)
- tabentry->autovac_analyze_timestamp = msg->m_vacuumtime;
- else
- tabentry->analyze_timestamp = msg->m_vacuumtime;
+ tabentry->autovac_vacuum_timestamp = msg->m_vacuumtime;
+ tabentry->autovac_vacuum_count++;
+ }
+ else
+ {
+ tabentry->vacuum_timestamp = msg->m_vacuumtime;
+ tabentry->vacuum_count++;
}
}
PgStat_StatTabEntry *tabentry;
/*
- * Don't create either the database or table entry if it doesn't already
- * exist. This avoids bloating the stats with entries for stuff that is
- * only touched by analyze and not by live operations.
+ * Store the data in the table's hashtable entry.
*/
- dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
- if (dbentry == NULL)
- return;
+ dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
- tabentry = hash_search(dbentry->tables, &(msg->m_tableoid),
- HASH_FIND, NULL);
- if (tabentry == NULL)
- return;
+ 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;
+
+ /*
+ * We reset changes_since_analyze to zero, forgetting any changes that
+ * occurred while the ANALYZE was in progress.
+ */
+ tabentry->changes_since_analyze = 0;
+
+ if (msg->m_autovacuum)
+ {
+ tabentry->autovac_analyze_timestamp = msg->m_analyzetime;
+ tabentry->autovac_analyze_count++;
+ }
+ else
+ {
+ tabentry->analyze_timestamp = msg->m_analyzetime;
+ tabentry->analyze_count++;
+ }
+}
+
+
+/* ----------
+ * 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_fsync_backend += msg->m_buf_fsync_backend;
+ globalStats.buf_alloc += msg->m_buf_alloc;
+}
+
+/* ----------
+ * pgstat_recv_recoveryconflict() -
+ *
+ * Process as RECOVERYCONFLICT message.
+ * ----------
+ */
+static void
+pgstat_recv_recoveryconflict(PgStat_MsgRecoveryConflict *msg, int len)
+{
+ PgStat_StatDBEntry *dbentry;
+
+ dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
+
+ switch (msg->m_reason)
+ {
+ case PROCSIG_RECOVERY_CONFLICT_DATABASE:
+
+ /*
+ * Since we drop the information about the database as soon as it
+ * replicates, there is no point in counting these conflicts.
+ */
+ break;
+ case PROCSIG_RECOVERY_CONFLICT_TABLESPACE:
+ dbentry->n_conflict_tablespace++;
+ break;
+ case PROCSIG_RECOVERY_CONFLICT_LOCK:
+ dbentry->n_conflict_lock++;
+ break;
+ case PROCSIG_RECOVERY_CONFLICT_SNAPSHOT:
+ dbentry->n_conflict_snapshot++;
+ break;
+ case PROCSIG_RECOVERY_CONFLICT_BUFFERPIN:
+ dbentry->n_conflict_bufferpin++;
+ break;
+ case PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK:
+ dbentry->n_conflict_startup_deadlock++;
+ break;
+ }
+}
+
+/* ----------
+ * 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);
+ }
}
projects / postgresql / blobdiff