* - Add a pgstat config column to pg_database, so this
* entire thing can be enabled/disabled on a per db basis.
*
- * Copyright (c) 2001-2003, PostgreSQL Global Development Group
+ * Copyright (c) 2001-2007, PostgreSQL Global Development Group
*
- * $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.73 2004/05/29 22:48:19 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.156 2007/05/27 03:50:39 tgl Exp $
* ----------
*/
#include "postgres.h"
#include <fcntl.h>
#include <sys/param.h>
#include <sys/time.h>
-#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
-#include <errno.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/catname.h"
#include "catalog/pg_database.h"
-#include "catalog/pg_shadow.h"
+#include "libpq/ip.h"
#include "libpq/libpq.h"
#include "libpq/pqsignal.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
+#include "postmaster/autovacuum.h"
+#include "postmaster/fork_process.h"
#include "postmaster/postmaster.h"
#include "storage/backendid.h"
+#include "storage/fd.h"
#include "storage/ipc.h"
#include "storage/pg_shmem.h"
#include "storage/pmsignal.h"
-#include "tcop/tcopprot.h"
-#include "utils/hsearch.h"
#include "utils/memutils.h"
#include "utils/ps_status.h"
-#include "utils/rel.h"
-#include "utils/syscache.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"
+
+/* ----------
+ * Timer definitions.
+ * ----------
+ */
+#define PGSTAT_STAT_INTERVAL 500 /* How often to write the status file;
+ * in milliseconds. */
+
+#define PGSTAT_RESTART_INTERVAL 60 /* How often to attempt to restart a
+ * failed statistics collector; in
+ * seconds. */
+
+#define PGSTAT_SELECT_TIMEOUT 2 /* How often to check for postmaster
+ * death; in seconds. */
+
+
+/* ----------
+ * The initial size hints for the hash tables used in the collector.
+ * ----------
+ */
+#define PGSTAT_DB_HASH_SIZE 16
+#define PGSTAT_TAB_HASH_SIZE 512
/* ----------
* ----------
*/
bool pgstat_collect_startcollector = true;
-bool pgstat_collect_resetonpmstart = true;
-bool pgstat_collect_querystring = false;
+bool pgstat_collect_resetonpmstart = false;
bool pgstat_collect_tuplelevel = false;
bool pgstat_collect_blocklevel = false;
+bool pgstat_collect_querystring = false;
-/* ----------
- * Other global variables
- * ----------
+/*
+ * 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.
*/
-bool pgstat_is_running = false;
+PgStat_MsgBgWriter BgWriterStats;
/* ----------
* Local data
* ----------
*/
-NON_EXEC_STATIC int pgStatSock = -1;
-static int pgStatPipe[2];
+NON_EXEC_STATIC int pgStatSock = -1;
+
static struct sockaddr_storage pgStatAddr;
-static int pgStatPid;
static time_t last_pgstat_start_time;
-static long pgStatNumMessages = 0;
+static bool pgStatRunningInCollector = false;
-static bool pgStatRunningInCollector = FALSE;
+/*
+ * 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.
+ */
+#define TABSTAT_QUANTUM 100 /* we alloc this many at a time */
+
+typedef struct TabStatusArray
+{
+ 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;
-static int pgStatTabstatAlloc = 0;
-static int pgStatTabstatUsed = 0;
-static PgStat_MsgTabstat **pgStatTabstatMessages = NULL;
+/*
+ * 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;
-#define TABSTAT_QUANTUM 4 /* we alloc this many at a time */
+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_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 HTAB *pgStatBeDead = NULL;
-static PgStat_StatBeEntry *pgStatBeTable = NULL;
-static int pgStatNumBackends = 0;
+static PgBackendStatus *localBackendStatusTable = NULL;
+static int localNumBackends = 0;
+
+/*
+ * Cluster wide statistics, kept in the stats collector.
+ * Contains statistics that are not collected per database
+ * or per table.
+ */
+static PgStat_GlobalStats globalStats;
-static char pgStat_fname[MAXPGPATH];
-static char pgStat_tmpfname[MAXPGPATH];
+static volatile bool need_exit = false;
+static volatile bool need_statwrite = false;
/* ----------
* ----------
*/
#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 pgstat_recvbuffer(void);
-static void pgstat_die(SIGNAL_ARGS);
+static void pgstat_exit(SIGNAL_ARGS);
+static void force_statwrite(SIGNAL_ARGS);
+static void pgstat_beshutdown_hook(int code, Datum arg);
-static int pgstat_add_backend(PgStat_MsgHdr *msg);
-static void pgstat_sub_backend(int procpid);
-static void pgstat_drop_database(Oid databaseid);
+static PgStat_StatDBEntry *pgstat_get_db_entry(Oid databaseid, bool create);
static void pgstat_write_statsfile(void);
-static void pgstat_read_statsfile(HTAB **dbhash, Oid onlydb,
- PgStat_StatBeEntry **betab,
- int *numbackends);
+static HTAB *pgstat_read_statsfile(Oid onlydb);
+static void backend_read_statsfile(void);
+static void pgstat_read_current_status(void);
-static void pgstat_setheader(PgStat_MsgHdr *hdr, int mtype);
+static void pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg);
+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_bestart(PgStat_MsgBestart *msg, int len);
-static void pgstat_recv_beterm(PgStat_MsgBeterm *msg, int len);
-static void pgstat_recv_activity(PgStat_MsgActivity *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_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);
/* ------------------------------------------------------------
*addr,
hints;
int ret;
- fd_set rset;
+ fd_set rset;
struct timeval tv;
- char test_byte;
- int sel_res;
+ char test_byte;
+ int sel_res;
+ int tries = 0;
#define TESTBYTEVAL ((char) 199)
/*
- * Force start of collector daemon if something to collect
+ * 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_querystring ||
- pgstat_collect_tuplelevel ||
+ if (pgstat_collect_tuplelevel ||
pgstat_collect_blocklevel)
pgstat_collect_startcollector = true;
- /*
- * Initialize the filename for the status reports. (In the EXEC_BACKEND
- * case, this only sets the value in the postmaster. The collector
- * subprocess will recompute the value for itself, and individual
- * backends must do so also if they want to access the file.)
- */
- snprintf(pgStat_fname, MAXPGPATH, PGSTAT_STAT_FILENAME, DataDir);
-
/*
* If we don't have to start a collector or should reset the collected
- * statistics on postmaster start, simply remove the file.
+ * statistics on postmaster start, simply remove the stats file.
*/
if (!pgstat_collect_startcollector || pgstat_collect_resetonpmstart)
- unlink(pgStat_fname);
+ pgstat_reset_all();
/*
* Nothing else required if collector will not get started
hints.ai_addr = NULL;
hints.ai_canonname = NULL;
hints.ai_next = NULL;
- ret = getaddrinfo_all("localhost", NULL, &hints, &addrs);
+ ret = pg_getaddrinfo_all("localhost", NULL, &hints, &addrs);
if (ret || !addrs)
{
ereport(LOG,
}
/*
- * On some platforms, getaddrinfo_all() may return multiple addresses
+ * On some platforms, pg_getaddrinfo_all() may return multiple addresses
* only one of which will actually work (eg, both IPv6 and IPv4 addresses
* when kernel will reject IPv6). Worse, the failure may occur at the
- * bind() or perhaps even connect() stage. So we must loop through the
- * results till we find a working combination. We will generate LOG
+ * bind() or perhaps even connect() stage. So we must loop through the
+ * results till we find a working combination. We will generate LOG
* messages, but no error, for bogus combinations.
*/
for (addr = addrs; addr; addr = addr->ai_next)
if (addr->ai_family == AF_UNIX)
continue;
#endif
+
+ if (++tries > 1)
+ ereport(LOG,
+ (errmsg("trying another address for the statistics collector")));
+
/*
* Create the socket.
*/
{
ereport(LOG,
(errcode_for_socket_access(),
- errmsg("could not create socket for statistics collector: %m")));
+ errmsg("could not create socket for statistics collector: %m")));
continue;
}
{
ereport(LOG,
(errcode_for_socket_access(),
- errmsg("could not bind socket for statistics collector: %m")));
+ errmsg("could not bind socket for statistics collector: %m")));
closesocket(pgStatSock);
pgStatSock = -1;
continue;
}
alen = sizeof(pgStatAddr);
- if (getsockname(pgStatSock, (struct sockaddr *) &pgStatAddr, &alen) < 0)
+ if (getsockname(pgStatSock, (struct sockaddr *) & pgStatAddr, &alen) < 0)
{
ereport(LOG,
(errcode_for_socket_access(),
* provides a kernel-level check that only packets from this same
* address will be received.
*/
- if (connect(pgStatSock, (struct sockaddr *) &pgStatAddr, alen) < 0)
+ if (connect(pgStatSock, (struct sockaddr *) & pgStatAddr, alen) < 0)
{
ereport(LOG,
(errcode_for_socket_access(),
- errmsg("could not connect socket for statistics collector: %m")));
+ errmsg("could not connect socket for statistics collector: %m")));
closesocket(pgStatSock);
pgStatSock = -1;
continue;
}
/*
- * Try to send and receive a one-byte test message on the socket.
- * This is to catch situations where the socket can be created but
- * will not actually pass data (for instance, because kernel packet
- * filtering rules prevent it).
+ * Try to send and receive a one-byte test message on the socket. This
+ * is to catch situations where the socket can be created but will not
+ * actually pass data (for instance, because kernel packet filtering
+ * rules prevent it).
*/
test_byte = TESTBYTEVAL;
+
+retry1:
if (send(pgStatSock, &test_byte, 1, 0) != 1)
{
+ if (errno == EINTR)
+ goto retry1; /* if interrupted, just retry */
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not send test message on socket for statistics collector: %m")));
FD_SET(pgStatSock, &rset);
tv.tv_sec = 0;
tv.tv_usec = 500000;
- sel_res = select(pgStatSock+1, &rset, NULL, NULL, &tv);
+ sel_res = select(pgStatSock + 1, &rset, NULL, NULL, &tv);
if (sel_res >= 0 || errno != EINTR)
break;
}
* errno will not be set meaningfully here, so don't use it.
*/
ereport(LOG,
- (ERRCODE_CONNECTION_FAILURE,
+ (errcode(ERRCODE_CONNECTION_FAILURE),
errmsg("test message did not get through on socket for statistics collector")));
closesocket(pgStatSock);
pgStatSock = -1;
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")));
continue;
}
- if (test_byte != TESTBYTEVAL) /* strictly paranoia ... */
+ if (test_byte != TESTBYTEVAL) /* strictly paranoia ... */
{
ereport(LOG,
- (ERRCODE_INTERNAL_ERROR,
+ (errcode(ERRCODE_INTERNAL_ERROR),
errmsg("incorrect test message transmission on socket for statistics collector")));
closesocket(pgStatSock);
pgStatSock = -1;
/* Did we find a working address? */
if (!addr || pgStatSock < 0)
- {
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("disabling statistics collector for lack of working 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.
+ * Set the socket to non-blocking IO. This ensures that if the collector
+ * falls behind, statistics messages will be discarded; backends won't
+ * block waiting to send messages to the collector.
*/
- if (!set_noblock(pgStatSock))
+ if (!pg_set_noblock(pgStatSock))
{
ereport(LOG,
(errcode_for_socket_access(),
- errmsg("could not set statistics collector socket to nonblocking mode: %m")));
+ errmsg("could not set statistics collector socket to nonblocking mode: %m")));
goto startup_failed;
}
- freeaddrinfo_all(hints.ai_family, addrs);
+ pg_freeaddrinfo_all(hints.ai_family, addrs);
return;
startup_failed:
+ ereport(LOG,
+ (errmsg("disabling statistics collector for lack of working socket")));
+
if (addrs)
- freeaddrinfo_all(hints.ai_family, addrs);
+ pg_freeaddrinfo_all(hints.ai_family, addrs);
if (pgStatSock >= 0)
closesocket(pgStatSock);
/* Adjust GUC variables to suppress useless activity */
pgstat_collect_startcollector = false;
- pgstat_collect_querystring = false;
pgstat_collect_tuplelevel = false;
pgstat_collect_blocklevel = false;
}
+/*
+ * 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
+ * recovery is needed after a crash.
+ */
+void
+pgstat_reset_all(void)
+{
+ unlink(PGSTAT_STAT_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];
+ char *av[10];
+ 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;
-
- /* Pipe file ids (those not passed by write_backend_variables) */
- snprintf(pgstatBuf[bufc++],32,"%d",pgStatPipe[0]);
- snprintf(pgstatBuf[bufc++],32,"%d",pgStatPipe[1]);
-
- /* 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 == 6);
-
- argc = 3;
- StrNCpy(postgres_exec_path, argv[argc++], MAXPGPATH);
- pgStatPipe[0] = atoi(argv[argc++]);
- pgStatPipe[1] = atoi(argv[argc++]);
-}
-
-#endif /* EXEC_BACKEND */
+#endif /* EXEC_BACKEND */
/* ----------
* Called from postmaster at startup or after an existing collector
* died. Attempt to fire up a fresh statistics collector.
*
+ * Returns PID of child process, or 0 if fail.
+ *
* Note: if fail, we will be called again from the postmaster main loop.
* ----------
*/
-void
+int
pgstat_start(void)
{
time_t curtime;
+ pid_t pgStatPid;
/*
* Do nothing if no collector needed
*/
- if (pgstat_is_running || !pgstat_collect_startcollector)
- return;
+ if (!pgstat_collect_startcollector)
+ return 0;
/*
- * Do nothing if too soon since last collector start. This is a
- * safety valve to protect against continuous respawn attempts if the
- * collector is dying immediately at launch. Note that since we will
- * be re-called from the postmaster main loop, we will get another
- * chance later.
+ * Do nothing if too soon since last collector start. This is a safety
+ * valve to protect against continuous respawn attempts if the collector
+ * is dying immediately at launch. Note that since we will be re-called
+ * from the postmaster main loop, we will get another chance later.
*/
curtime = time(NULL);
if ((unsigned int) (curtime - last_pgstat_start_time) <
(unsigned int) PGSTAT_RESTART_INTERVAL)
- return;
+ return 0;
last_pgstat_start_time = curtime;
/*
* pgstat_collect_startcollector on after it had been off.
*/
pgstat_collect_startcollector = false;
- return;
+ return 0;
}
/*
- * Okay, fork off the collector. Remember its PID for
- * pgstat_ispgstat.
+ * Okay, fork off the collector.
*/
-
- fflush(stdout);
- fflush(stderr);
-
-#ifdef __BEOS__
- /* Specific beos actions before backend startup */
- beos_before_backend_startup();
-#endif
-
#ifdef EXEC_BACKEND
- switch ((pgStatPid = (int) pgstat_forkexec(STAT_PROC_BUFFER)))
+ switch ((pgStatPid = pgstat_forkexec()))
#else
- switch ((pgStatPid = (int) fork()))
+ switch ((pgStatPid = fork_process()))
#endif
{
case -1:
-#ifdef __BEOS__
- /* Specific beos actions */
- beos_backend_startup_failed();
-#endif
ereport(LOG,
- (errmsg("could not fork statistics buffer: %m")));
- return;
+ (errmsg("could not fork statistics collector: %m")));
+ return 0;
#ifndef EXEC_BACKEND
case 0:
/* in postmaster child ... */
-#ifdef __BEOS__
- /* Specific beos actions after backend startup */
- beos_backend_startup();
-#endif
/* Close the postmaster's sockets */
- ClosePostmasterPorts();
+ ClosePostmasterPorts(false);
+
+ /* Lose the postmaster's on-exit routines */
+ on_exit_reset();
/* Drop our connection to postmaster's shared memory, as well */
PGSharedMemoryDetach();
- PgstatBufferMain(0, NULL);
+ PgstatCollectorMain(0, NULL);
break;
#endif
default:
- pgstat_is_running = true;
- return;
+ return (int) pgStatPid;
}
-}
-
-
-/* ----------
- * pgstat_ispgstat() -
- *
- * Called from postmaster to check if a terminated child process
- * was the statistics collector.
- * ----------
- */
-bool
-pgstat_ispgstat(int pid)
-{
- if (!pgstat_is_running)
- return false;
-
- if (pgStatPid != pid)
- return false;
- /* Oh dear ... */
- pgstat_is_running = false;
-
- return true;
+ /* shouldn't get here */
+ return 0;
}
-
-/* ----------
- * pgstat_beterm() -
- *
- * Called from postmaster to tell collector a backend terminated.
- * ----------
- */
-void
-pgstat_beterm(int pid)
+void allow_immediate_pgstat_restart(void)
{
- PgStat_MsgBeterm msg;
-
- if (pgStatSock < 0)
- return;
-
- MemSet(&(msg.m_hdr), 0, sizeof(msg.m_hdr));
- msg.m_hdr.m_type = PGSTAT_MTYPE_BETERM;
- msg.m_hdr.m_procpid = pid;
-
- pgstat_send(&msg, sizeof(msg));
+ last_pgstat_start_time = 0;
}
-
/* ------------------------------------------------------------
* Public functions used by backends follow
*------------------------------------------------------------
/* ----------
- * pgstat_bestart() -
+ * pgstat_report_tabstat() -
*
- * Tell the collector that this new backend is soon ready to process
- * queries. Called from tcop/postgres.c before entering the mainloop.
+ * Called from tcop/postgres.c to send the so far collected per-table
+ * access 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_bestart(void)
+pgstat_report_tabstat(bool force)
{
- PgStat_MsgBestart msg;
+ /* 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)
+ /* Don't expend a clock check if nothing to do */
+ if (pgStatTabList == NULL ||
+ pgStatTabList->tsa_used == 0)
return;
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_BESTART);
- pgstat_send(&msg, sizeof(msg));
-}
-
+ /*
+ * 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;
-/* ----------
- * pgstat_report_activity() -
- *
- * Called in tcop/postgres.c to tell the collector what the backend
- * is actually doing (usually "<IDLE>" or the start of the query to
- * be executed).
- * ----------
- */
-void
-pgstat_report_activity(const char *what)
-{
- PgStat_MsgActivity msg;
- int len;
+ /*
+ * Scan through the TabStatusArray struct(s) to find tables that actually
+ * have counts, and build messages to send. We have to separate shared
+ * relations from regular ones because the databaseid field in the
+ * message header has to depend on that.
+ */
+ regular_msg.m_databaseid = MyDatabaseId;
+ shared_msg.m_databaseid = InvalidOid;
+ regular_msg.m_nentries = 0;
+ shared_msg.m_nentries = 0;
- if (!pgstat_collect_querystring || pgStatSock < 0)
- return;
+ for (tsa = pgStatTabList; tsa != NULL; tsa = tsa->tsa_next)
+ {
+ for (i = 0; i < tsa->tsa_used; i++)
+ {
+ PgStat_TableStatus *entry = &tsa->tsa_entries[i];
+ PgStat_MsgTabstat *this_msg;
+ PgStat_TableEntry *this_ent;
- len = strlen(what);
- len = pg_mbcliplen((const unsigned char *) what, len,
- PGSTAT_ACTIVITY_SIZE - 1);
+ /* Shouldn't have any pending transaction-dependent counts */
+ Assert(entry->trans == NULL);
- memcpy(msg.m_what, what, len);
- msg.m_what[len] = '\0';
- len += offsetof(PgStat_MsgActivity, m_what) +1;
+ /*
+ * 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;
+ }
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_ACTIVITY);
- pgstat_send(&msg, len);
+ /*
+ * 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);
}
-
-/* ----------
- * pgstat_report_tabstat() -
- *
- * Called from tcop/postgres.c to send the so far collected
- * per table access statistics to the collector.
- * ----------
+/*
+ * Subroutine for pgstat_report_tabstat: finish and send a tabstat message
*/
-void
-pgstat_report_tabstat(void)
+static void
+pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg)
{
- int i;
+ int n;
+ int len;
- if (pgStatSock < 0 ||
- !(pgstat_collect_querystring ||
- pgstat_collect_tuplelevel ||
- pgstat_collect_blocklevel))
- {
- /* Not reporting stats, so just flush whatever we have */
- pgStatTabstatUsed = 0;
+ /* It's unlikely we'd get here with no socket, but maybe not impossible */
+ if (pgStatSock < 0)
return;
- }
/*
- * For each message buffer used during the last query set the header
- * fields and send it out.
+ * Report accumulated xact commit/rollback whenever we send a normal
+ * tabstat message
*/
- for (i = 0; i < pgStatTabstatUsed; i++)
+ if (OidIsValid(tsmsg->m_databaseid))
{
- PgStat_MsgTabstat *tsmsg = pgStatTabstatMessages[i];
- int n;
- int len;
-
- n = tsmsg->m_nentries;
- len = offsetof(PgStat_MsgTabstat, m_entry[0]) +
- n * sizeof(PgStat_TableEntry);
-
tsmsg->m_xact_commit = pgStatXactCommit;
tsmsg->m_xact_rollback = pgStatXactRollback;
pgStatXactCommit = 0;
pgStatXactRollback = 0;
-
- pgstat_setheader(&tsmsg->m_hdr, PGSTAT_MTYPE_TABSTAT);
- pgstat_send(tsmsg, len);
+ }
+ else
+ {
+ tsmsg->m_xact_commit = 0;
+ tsmsg->m_xact_rollback = 0;
}
- pgStatTabstatUsed = 0;
+ n = tsmsg->m_nentries;
+ len = offsetof(PgStat_MsgTabstat, m_entry[0]) +
+ n * sizeof(PgStat_TableEntry);
+
+ pgstat_setheader(&tsmsg->m_hdr, PGSTAT_MTYPE_TABSTAT);
+ pgstat_send(tsmsg, len);
}
* Will tell the collector about objects he can get rid of.
* ----------
*/
-int
+void
pgstat_vacuum_tabstat(void)
{
- Relation dbrel;
- HeapScanDesc dbscan;
- HeapTuple dbtup;
- Oid *dbidlist;
- int dbidalloc;
- int dbidused;
+ HTAB *htab;
+ PgStat_MsgTabpurge msg;
HASH_SEQ_STATUS hstat;
PgStat_StatDBEntry *dbentry;
PgStat_StatTabEntry *tabentry;
- HeapTuple reltup;
- int nobjects = 0;
- PgStat_MsgTabpurge msg;
int len;
- int i;
if (pgStatSock < 0)
- return 0;
+ return;
+
+ /*
+ * If not done for this transaction, read the statistics collector stats
+ * file into some hash tables.
+ */
+ backend_read_statsfile();
+
+ /*
+ * Read pg_database and make a list of OIDs of all existing databases
+ */
+ htab = pgstat_collect_oids(DatabaseRelationId);
/*
- * If not done for this transaction, read the statistics collector
- * stats file into some hash tables.
+ * Search the database hash table for dead databases and tell the
+ * collector to drop them.
*/
- if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
+ hash_seq_init(&hstat, pgStatDBHash);
+ while ((dbentry = (PgStat_StatDBEntry *) hash_seq_search(&hstat)) != NULL)
{
- pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
- &pgStatBeTable, &pgStatNumBackends);
- pgStatDBHashXact = GetCurrentTransactionId();
+ Oid dbid = dbentry->databaseid;
+
+ CHECK_FOR_INTERRUPTS();
+
+ if (hash_search(htab, (void *) &dbid, HASH_FIND, NULL) == NULL)
+ pgstat_drop_database(dbid);
}
+ /* Clean up */
+ hash_destroy(htab);
+
/*
- * Lookup our own database entry
+ * Lookup our own database entry; if not found, nothing more to do.
*/
dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
(void *) &MyDatabaseId,
HASH_FIND, NULL);
- if (dbentry == NULL)
- return -1;
+ if (dbentry == NULL || dbentry->tables == NULL)
+ return;
- if (dbentry->tables == NULL)
- return 0;
+ /*
+ * Similarly to above, make a list of all known relations in this DB.
+ */
+ htab = pgstat_collect_oids(RelationRelationId);
/*
* Initialize our messages table counter to zero
msg.m_nentries = 0;
/*
- * Check for all tables if they still exist.
+ * Check for all tables listed in stats hashtable if they still exist.
*/
hash_seq_init(&hstat, dbentry->tables);
while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&hstat)) != NULL)
{
- /*
- * Check if this relation is still alive by looking up it's
- * pg_class tuple in the system catalog cache.
- */
- reltup = SearchSysCache(RELOID,
- ObjectIdGetDatum(tabentry->tableid),
- 0, 0, 0);
- if (HeapTupleIsValid(reltup))
- {
- ReleaseSysCache(reltup);
+ Oid tabid = tabentry->tableid;
+
+ CHECK_FOR_INTERRUPTS();
+
+ if (hash_search(htab, (void *) &tabid, HASH_FIND, NULL) != NULL)
continue;
- }
/*
- * Add this tables Oid to the message
+ * Not there, so add this table's Oid to the message
*/
- msg.m_tableid[msg.m_nentries++] = tabentry->tableid;
- nobjects++;
+ msg.m_tableid[msg.m_nentries++] = tabid;
/*
- * If the message is full, send it out and reinitialize ot zero
+ * If the message is full, send it out and reinitialize to empty
*/
if (msg.m_nentries >= PGSTAT_NUM_TABPURGE)
{
+msg.m_nentries * sizeof(Oid);
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
+ msg.m_databaseid = MyDatabaseId;
pgstat_send(&msg, len);
msg.m_nentries = 0;
+msg.m_nentries * sizeof(Oid);
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
+ msg.m_databaseid = MyDatabaseId;
pgstat_send(&msg, len);
}
- /*
- * Read pg_database and remember the Oid's of all existing databases
- */
- dbidalloc = 256;
- dbidused = 0;
- dbidlist = (Oid *) palloc(sizeof(Oid) * dbidalloc);
+ /* Clean up */
+ hash_destroy(htab);
+}
- dbrel = heap_openr(DatabaseRelationName, AccessShareLock);
- dbscan = heap_beginscan(dbrel, SnapshotNow, 0, NULL);
- while ((dbtup = heap_getnext(dbscan, ForwardScanDirection)) != NULL)
- {
- if (dbidused >= dbidalloc)
- {
- dbidalloc *= 2;
- dbidlist = (Oid *) repalloc((char *) dbidlist,
- sizeof(Oid) * dbidalloc);
- }
- dbidlist[dbidused++] = HeapTupleGetOid(dbtup);
- }
- heap_endscan(dbscan);
- heap_close(dbrel, AccessShareLock);
- /*
- * Search the database hash table for dead databases and tell the
- * collector to drop them as well.
- */
- hash_seq_init(&hstat, pgStatDBHash);
- while ((dbentry = (PgStat_StatDBEntry *) hash_seq_search(&hstat)) != NULL)
+/* ----------
+ * pgstat_collect_oids() -
+ *
+ * Collect the OIDs of either all databases or all tables, according to
+ * the parameter, into a temporary hash table. Caller should hash_destroy
+ * the result when done with it.
+ * ----------
+ */
+static HTAB *
+pgstat_collect_oids(Oid catalogid)
+{
+ HTAB *htab;
+ HASHCTL hash_ctl;
+ Relation rel;
+ HeapScanDesc scan;
+ HeapTuple tup;
+
+ memset(&hash_ctl, 0, sizeof(hash_ctl));
+ hash_ctl.keysize = sizeof(Oid);
+ hash_ctl.entrysize = sizeof(Oid);
+ hash_ctl.hash = oid_hash;
+ htab = hash_create("Temporary table of OIDs",
+ PGSTAT_TAB_HASH_SIZE,
+ &hash_ctl,
+ HASH_ELEM | HASH_FUNCTION);
+
+ rel = heap_open(catalogid, AccessShareLock);
+ scan = heap_beginscan(rel, SnapshotNow, 0, NULL);
+ while ((tup = heap_getnext(scan, ForwardScanDirection)) != NULL)
{
- Oid dbid = dbentry->databaseid;
+ Oid thisoid = HeapTupleGetOid(tup);
- for (i = 0; i < dbidused; i++)
- {
- if (dbidlist[i] == dbid)
- {
- dbid = InvalidOid;
- break;
- }
- }
+ CHECK_FOR_INTERRUPTS();
- if (dbid != InvalidOid)
- {
- nobjects++;
- pgstat_drop_database(dbid);
- }
+ (void) hash_search(htab, (void *) &thisoid, HASH_ENTER, NULL);
}
+ heap_endscan(scan);
+ heap_close(rel, AccessShareLock);
- /*
- * Free the dbid list.
- */
- pfree((char *) dbidlist);
-
- /*
- * Tell the caller how many removeable objects we found
- */
- return nobjects;
-}
+ return htab;
+}
/* ----------
* pgstat_drop_database() -
*
* Tell the collector that we just dropped a database.
- * This is the only message that shouldn't get lost in space. Otherwise
- * the collector will keep the statistics for the dead DB until his
- * stats file got removed while the postmaster is down.
+ * (If the message gets lost, we will still clean the dead DB eventually
+ * via future invocations of pgstat_vacuum_tabstat().)
* ----------
*/
-static void
+void
pgstat_drop_database(Oid databaseid)
{
PgStat_MsgDropdb msg;
if (pgStatSock < 0)
return;
- msg.m_databaseid = databaseid;
-
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DROPDB);
+ msg.m_databaseid = databaseid;
pgstat_send(&msg, sizeof(msg));
}
+/* ----------
+ * pgstat_drop_relation() -
+ *
+ * Tell the collector that we just dropped a relation.
+ * (If the message gets lost, we will still clean the dead entry eventually
+ * via future invocations of pgstat_vacuum_tabstat().)
+ * ----------
+ */
+void
+pgstat_drop_relation(Oid relid)
+{
+ PgStat_MsgTabpurge msg;
+ int len;
+
+ if (pgStatSock < 0)
+ return;
+
+ msg.m_tableid[0] = relid;
+ msg.m_nentries = 1;
+
+ len = offsetof(PgStat_MsgTabpurge, m_tableid[0]) +sizeof(Oid);
+
+ pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
+ msg.m_databaseid = MyDatabaseId;
+ pgstat_send(&msg, len);
+}
+
+
/* ----------
* pgstat_reset_counters() -
*
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
- errmsg("must be superuser to reset statistics counters")));
+ errmsg("must be superuser to reset statistics counters")));
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETCOUNTER);
+ msg.m_databaseid = MyDatabaseId;
pgstat_send(&msg, sizeof(msg));
}
/* ----------
- * pgstat_ping() -
+ * pgstat_report_autovac() -
*
- * Send some junk data to the collector to increase traffic.
+ * 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_ping(void)
+pgstat_report_autovac(Oid dboid)
{
- PgStat_MsgDummy msg;
+ PgStat_MsgAutovacStart msg;
if (pgStatSock < 0)
return;
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DUMMY);
+ pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_AUTOVAC_START);
+ msg.m_databaseid = dboid;
+ msg.m_start_time = GetCurrentTimestamp();
+
pgstat_send(&msg, sizeof(msg));
}
-/*
- * Create or enlarge the pgStatTabstatMessages array
+
+/* ---------
+ * pgstat_report_vacuum() -
+ *
+ * Tell the collector about the table we just vacuumed.
+ * ---------
*/
-static bool
-more_tabstat_space(void)
+void
+pgstat_report_vacuum(Oid tableoid, bool shared,
+ bool analyze, PgStat_Counter tuples)
{
- PgStat_MsgTabstat *newMessages;
- PgStat_MsgTabstat **msgArray;
- int newAlloc = pgStatTabstatAlloc + TABSTAT_QUANTUM;
- int i;
+ PgStat_MsgVacuum msg;
- /* Create (another) quantum of message buffers */
- newMessages = (PgStat_MsgTabstat *)
- malloc(sizeof(PgStat_MsgTabstat) * TABSTAT_QUANTUM);
- if (newMessages == NULL)
- {
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory")));
- return false;
- }
+ if (pgStatSock < 0 ||
+ !pgstat_collect_tuplelevel)
+ return;
- /* Create or enlarge the pointer array */
- if (pgStatTabstatMessages == NULL)
- msgArray = (PgStat_MsgTabstat **)
- malloc(sizeof(PgStat_MsgTabstat *) * newAlloc);
- else
- msgArray = (PgStat_MsgTabstat **)
- realloc(pgStatTabstatMessages,
- sizeof(PgStat_MsgTabstat *) * newAlloc);
- if (msgArray == NULL)
- {
- free(newMessages);
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory")));
- return false;
- }
+ 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 = IsAutoVacuumWorkerProcess(); /* is this autovacuum? */
+ msg.m_vacuumtime = GetCurrentTimestamp();
+ msg.m_tuples = tuples;
+ pgstat_send(&msg, sizeof(msg));
+}
+
+/* --------
+ * pgstat_report_analyze() -
+ *
+ * Tell the collector about the table we just analyzed.
+ * --------
+ */
+void
+pgstat_report_analyze(Oid tableoid, bool shared, PgStat_Counter livetuples,
+ PgStat_Counter deadtuples)
+{
+ PgStat_MsgAnalyze msg;
+
+ if (pgStatSock < 0 ||
+ !pgstat_collect_tuplelevel)
+ return;
+
+ pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_ANALYZE);
+ msg.m_databaseid = shared ? InvalidOid : MyDatabaseId;
+ msg.m_tableoid = tableoid;
+ msg.m_autovacuum = IsAutoVacuumWorkerProcess(); /* is this autovacuum? */
+ msg.m_analyzetime = GetCurrentTimestamp();
+ msg.m_live_tuples = livetuples;
+ msg.m_dead_tuples = deadtuples;
+ pgstat_send(&msg, sizeof(msg));
+}
+
+
+/* ----------
+ * pgstat_ping() -
+ *
+ * Send some junk data to the collector to increase traffic.
+ * ----------
+ */
+void
+pgstat_ping(void)
+{
+ PgStat_MsgDummy msg;
- MemSet(newMessages, 0, sizeof(PgStat_MsgTabstat) * TABSTAT_QUANTUM);
- for (i = 0; i < TABSTAT_QUANTUM; i++)
- msgArray[pgStatTabstatAlloc + i] = newMessages++;
- pgStatTabstatMessages = msgArray;
- pgStatTabstatAlloc = newAlloc;
+ if (pgStatSock < 0)
+ return;
- return true;
+ pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DUMMY);
+ pgstat_send(&msg, sizeof(msg));
}
+
/* ----------
* 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;
- PgStat_MsgTabstat *tsmsg;
- int mb;
- int i;
+ char relkind = rel->rd_rel->relkind;
- /*
- * Initialize data not to count at all.
- */
- stats->tabentry = NULL;
- stats->no_stats = FALSE;
- stats->heap_scan_counted = FALSE;
- stats->index_scan_counted = FALSE;
+ /* We only count stats for things that have storage */
+ if (!(relkind == RELKIND_RELATION ||
+ relkind == RELKIND_INDEX ||
+ relkind == RELKIND_TOASTVALUE))
+ {
+ rel->pgstat_info = NULL;
+ return;
+ }
if (pgStatSock < 0 ||
!(pgstat_collect_tuplelevel ||
pgstat_collect_blocklevel))
{
- stats->no_stats = TRUE;
+ /* We're not counting at all */
+ rel->pgstat_info = NULL;
return;
}
/*
- * Search the already-used message slots for this relation.
+ * If we already set up this relation in the current transaction,
+ * nothing to do.
*/
- for (mb = 0; mb < pgStatTabstatUsed; mb++)
- {
- tsmsg = pgStatTabstatMessages[mb];
-
- for (i = tsmsg->m_nentries; --i >= 0; )
- {
- if (tsmsg->m_entry[i].t_id == rel_id)
- {
- stats->tabentry = (void *) &(tsmsg->m_entry[i]);
- return;
- }
- }
+ if (rel->pgstat_info != NULL &&
+ rel->pgstat_info->t_id == rel_id)
+ return;
- if (tsmsg->m_nentries >= PGSTAT_NUM_TABENTRIES)
- continue;
+ /* Else find or make the PgStat_TableStatus entry, and update link */
+ rel->pgstat_info = get_tabstat_entry(rel_id, rel->rd_rel->relisshared);
+}
- /*
- * 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;
- }
+/*
+ * 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;
/*
- * If we ran out of message buffers, we just allocate more.
+ * Search the already-used tabstat slots for this relation.
*/
- if (pgStatTabstatUsed >= pgStatTabstatAlloc)
+ prev_tsa = NULL;
+ for (tsa = pgStatTabList; tsa != NULL; prev_tsa = tsa, tsa = tsa->tsa_next)
{
- if (!more_tabstat_space())
+ for (i = 0; i < tsa->tsa_used; i++)
+ {
+ entry = &tsa->tsa_entries[i];
+ if (entry->t_id == rel_id)
+ return entry;
+ }
+
+ if (tsa->tsa_used < TABSTAT_QUANTUM)
{
- stats->no_stats = TRUE;
- return;
+ /*
+ * 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;
}
- Assert(pgStatTabstatUsed < pgStatTabstatAlloc);
}
/*
- * Use the first entry of the next message buffer.
+ * We ran out of tabstat slots, so allocate more. Be sure they're zeroed.
*/
- mb = pgStatTabstatUsed++;
- tsmsg = pgStatTabstatMessages[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;
-}
+ tsa = (TabStatusArray *) MemoryContextAllocZero(TopMemoryContext,
+ sizeof(TabStatusArray));
+ if (prev_tsa)
+ prev_tsa->tsa_next = tsa;
+ else
+ pgStatTabList = tsa;
+ /*
+ * Use the first entry of the new TabStatusArray.
+ */
+ entry = &tsa->tsa_entries[tsa->tsa_used++];
+ entry->t_id = rel_id;
+ entry->t_shared = isshared;
+ return entry;
+}
-/* ----------
- * pgstat_count_xact_commit() -
- *
- * Called from access/transam/xact.c to count transaction commits.
- * ----------
+/*
+ * get_tabstat_stack_level - add a new (sub)transaction stack entry if needed
*/
-void
-pgstat_count_xact_commit(void)
+static PgStat_SubXactStatus *
+get_tabstat_stack_level(int nest_level)
{
- if (!(pgstat_collect_querystring ||
- pgstat_collect_tuplelevel ||
- pgstat_collect_blocklevel))
- return;
+ PgStat_SubXactStatus *xact_state;
- pgStatXactCommit++;
-
- /*
- * 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 (pgStatTabstatAlloc == 0)
- {
- if (!more_tabstat_space())
- return;
- }
- if (pgStatTabstatUsed == 0)
+ xact_state = pgStatXactStack;
+ if (xact_state == NULL || xact_state->nest_level != nest_level)
{
- pgStatTabstatUsed++;
- pgStatTabstatMessages[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;
}
-
-/* ----------
- * pgstat_count_xact_rollback() -
- *
- * Called from access/transam/xact.c to count transaction rollbacks.
- * ----------
+/*
+ * add_tabstat_xact_level - add a new (sub)transaction state record
*/
-void
-pgstat_count_xact_rollback(void)
+static void
+add_tabstat_xact_level(PgStat_TableStatus *pgstat_info, int nest_level)
{
- if (!(pgstat_collect_querystring ||
- pgstat_collect_tuplelevel ||
- pgstat_collect_blocklevel))
- return;
-
- pgStatXactRollback++;
+ PgStat_SubXactStatus *xact_state;
+ PgStat_TableXactStatus *trans;
/*
- * 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 this is the first rel to be modified at the current nest level,
+ * we first have to push a transaction stack entry.
*/
- if (pgStatTabstatAlloc == 0)
+ xact_state = get_tabstat_stack_level(nest_level);
+
+ /* Now make a per-table stack entry */
+ trans = (PgStat_TableXactStatus *)
+ MemoryContextAllocZero(TopTransactionContext,
+ sizeof(PgStat_TableXactStatus));
+ trans->nest_level = nest_level;
+ trans->upper = pgstat_info->trans;
+ trans->parent = pgstat_info;
+ trans->next = xact_state->first;
+ xact_state->first = trans;
+ pgstat_info->trans = trans;
+}
+
+/*
+ * pgstat_count_heap_insert - count a tuple insertion
+ */
+void
+pgstat_count_heap_insert(Relation rel)
+{
+ PgStat_TableStatus *pgstat_info = rel->pgstat_info;
+
+ if (pgstat_collect_tuplelevel && pgstat_info != NULL)
{
- if (!more_tabstat_space())
- return;
+ int nest_level = GetCurrentTransactionNestLevel();
+
+ /* t_tuples_inserted is nontransactional, so just advance it */
+ pgstat_info->t_counts.t_tuples_inserted++;
+
+ /* We have to log the transactional effect at the proper level */
+ if (pgstat_info->trans == NULL ||
+ pgstat_info->trans->nest_level != nest_level)
+ add_tabstat_xact_level(pgstat_info, nest_level);
+
+ pgstat_info->trans->tuples_inserted++;
}
- if (pgStatTabstatUsed == 0)
+}
+
+/*
+ * pgstat_count_heap_update - count a tuple update
+ */
+void
+pgstat_count_heap_update(Relation rel)
+{
+ PgStat_TableStatus *pgstat_info = rel->pgstat_info;
+
+ if (pgstat_collect_tuplelevel && pgstat_info != NULL)
{
- pgStatTabstatUsed++;
- pgStatTabstatMessages[0]->m_nentries = 0;
+ int nest_level = GetCurrentTransactionNestLevel();
+
+ /* t_tuples_updated is nontransactional, so just advance it */
+ pgstat_info->t_counts.t_tuples_updated++;
+
+ /* We have to log the transactional effect at the proper level */
+ if (pgstat_info->trans == NULL ||
+ pgstat_info->trans->nest_level != nest_level)
+ add_tabstat_xact_level(pgstat_info, nest_level);
+
+ /* An UPDATE both inserts a new tuple and deletes the old */
+ pgstat_info->trans->tuples_inserted++;
+ pgstat_info->trans->tuples_deleted++;
}
}
-
-/* ----------
- * pgstat_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_count_heap_delete - count a tuple deletion
*/
-PgStat_StatDBEntry *
-pgstat_fetch_stat_dbentry(Oid dbid)
+void
+pgstat_count_heap_delete(Relation rel)
{
- PgStat_StatDBEntry *dbentry;
+ PgStat_TableStatus *pgstat_info = rel->pgstat_info;
- /*
- * If not done for this transaction, read the statistics collector
- * stats file into some hash tables. Be careful with the
- * read_statsfile() call below!
- */
- if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
+ if (pgstat_collect_tuplelevel && pgstat_info != NULL)
{
- pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
- &pgStatBeTable, &pgStatNumBackends);
- pgStatDBHashXact = GetCurrentTransactionId();
- }
+ int nest_level = GetCurrentTransactionNestLevel();
- /*
- * Lookup the requested database
- */
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &dbid,
- HASH_FIND, NULL);
- if (dbentry == NULL)
- return NULL;
+ /* t_tuples_deleted is nontransactional, so just advance it */
+ pgstat_info->t_counts.t_tuples_deleted++;
- return dbentry;
+ /* We have to log the transactional effect at the proper level */
+ if (pgstat_info->trans == NULL ||
+ pgstat_info->trans->nest_level != nest_level)
+ add_tabstat_xact_level(pgstat_info, nest_level);
+
+ pgstat_info->trans->tuples_deleted++;
+ }
}
/* ----------
- * pgstat_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)
{
- 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. Be careful with the
- * read_statsfile() call below!
+ * Count transaction commit or abort. (We use counters, not just bools,
+ * in case the reporting message isn't sent right away.)
*/
- if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
- {
- pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
- &pgStatBeTable, &pgStatNumBackends);
- pgStatDBHashXact = GetCurrentTransactionId();
- }
+ if (isCommit)
+ pgStatXactCommit++;
+ else
+ pgStatXactRollback++;
/*
- * Lookup our database.
+ * 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.
*/
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &MyDatabaseId,
- HASH_FIND, NULL);
- if (dbentry == NULL)
- return NULL;
+ xact_state = pgStatXactStack;
+ if (xact_state != NULL)
+ {
+ PgStat_TableXactStatus *trans;
- /*
- * Now inside the DB's table hash table lookup the requested one.
- */
- if (dbentry->tables == NULL)
- return NULL;
- tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
- (void *) &relid,
- HASH_FIND, NULL);
- if (tabentry == NULL)
- return NULL;
+ Assert(xact_state->nest_level == 1);
+ Assert(xact_state->prev == NULL);
+ for (trans = xact_state->first; trans != NULL; trans = trans->next)
+ {
+ PgStat_TableStatus *tabstat;
- return tabentry;
-}
+ Assert(trans->nest_level == 1);
+ Assert(trans->upper == NULL);
+ tabstat = trans->parent;
+ Assert(tabstat->trans == trans);
+ if (isCommit)
+ {
+ tabstat->t_counts.t_new_live_tuples += trans->tuples_inserted;
+ tabstat->t_counts.t_new_dead_tuples += trans->tuples_deleted;
+ }
+ else
+ {
+ /* inserted tuples are dead, deleted tuples are unaffected */
+ tabstat->t_counts.t_new_dead_tuples += trans->tuples_inserted;
+ }
+ tabstat->trans = NULL;
+ }
+ }
+ pgStatXactStack = NULL;
+ /* Make sure any stats snapshot is thrown away */
+ pgstat_clear_snapshot();
+}
/* ----------
- * pgstat_fetch_stat_beentry() -
+ * AtEOSubXact_PgStat
*
- * Support function for the SQL-callable pgstat* functions. Returns
- * the actual activity slot of one active backend. The caller is
- * responsible for a check if the actual user is permitted to see
- * that info (especially the querystring).
+ * Called from access/transam/xact.c at subtransaction commit/abort.
* ----------
*/
-PgStat_StatBeEntry *
-pgstat_fetch_stat_beentry(int beid)
+void
+AtEOSubXact_PgStat(bool isCommit, int nestDepth)
{
- if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
+ 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_read_statsfile(&pgStatDBHash, MyDatabaseId,
- &pgStatBeTable, &pgStatNumBackends);
- pgStatDBHashXact = GetCurrentTransactionId();
- }
+ PgStat_TableXactStatus *trans;
+ PgStat_TableXactStatus *next_trans;
- if (beid < 1 || beid > pgStatNumBackends)
- return NULL;
+ /* 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;
- return &pgStatBeTable[beid - 1];
+ next_trans = trans->next;
+ Assert(trans->nest_level == nestDepth);
+ tabstat = trans->parent;
+ Assert(tabstat->trans == trans);
+ if (isCommit)
+ {
+ if (trans->upper && trans->upper->nest_level == nestDepth - 1)
+ {
+ trans->upper->tuples_inserted += trans->tuples_inserted;
+ trans->upper->tuples_deleted += trans->tuples_deleted;
+ tabstat->trans = trans->upper;
+ pfree(trans);
+ }
+ else
+ {
+ /*
+ * When there isn't an immediate parent state, we can
+ * just reuse the record instead of going through a
+ * palloc/pfree pushup (this works since it's all in
+ * TopTransactionContext anyway). We have to re-link
+ * it into the parent level, though, and that might mean
+ * pushing a new entry into the pgStatXactStack.
+ */
+ PgStat_SubXactStatus *upper_xact_state;
+
+ upper_xact_state = get_tabstat_stack_level(nestDepth - 1);
+ trans->next = upper_xact_state->first;
+ upper_xact_state->first = trans;
+ trans->nest_level = nestDepth - 1;
+ }
+ }
+ else
+ {
+ /*
+ * On abort, inserted tuples are dead (and can be bounced out
+ * to the top-level tabstat), deleted tuples are unaffected
+ */
+ tabstat->t_counts.t_new_dead_tuples += trans->tuples_inserted;
+ tabstat->trans = trans->upper;
+ pfree(trans);
+ }
+ }
+ pfree(xact_state);
+ }
}
-/* ----------
- * pgstat_fetch_stat_numbackends() -
+/*
+ * AtPrepare_PgStat
+ * Save the transactional stats state at 2PC transaction prepare.
*
- * Support function for the SQL-callable pgstat* functions. Returns
- * the maximum current backend id.
- * ----------
+ * In this phase we just generate 2PC records for all the pending
+ * transaction-dependent stats work.
*/
-int
-pgstat_fetch_stat_numbackends(void)
+void
+AtPrepare_PgStat(void)
{
- if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
+ PgStat_SubXactStatus *xact_state;
+
+ xact_state = pgStatXactStack;
+ if (xact_state != NULL)
{
- pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
- &pgStatBeTable, &pgStatNumBackends);
- pgStatDBHashXact = GetCurrentTransactionId();
- }
+ PgStat_TableXactStatus *trans;
- return pgStatNumBackends;
-}
+ Assert(xact_state->nest_level == 1);
+ Assert(xact_state->prev == NULL);
+ for (trans = xact_state->first; trans != NULL; trans = trans->next)
+ {
+ PgStat_TableStatus *tabstat;
+ TwoPhasePgStatRecord record;
+ Assert(trans->nest_level == 1);
+ Assert(trans->upper == NULL);
+ tabstat = trans->parent;
+ Assert(tabstat->trans == trans);
+ record.tuples_inserted = trans->tuples_inserted;
+ record.tuples_deleted = trans->tuples_deleted;
+ record.t_id = tabstat->t_id;
+ record.t_shared = tabstat->t_shared;
-/* ------------------------------------------------------------
- * Local support functions follow
- * ------------------------------------------------------------
- */
+ RegisterTwoPhaseRecord(TWOPHASE_RM_PGSTAT_ID, 0,
+ &record, sizeof(TwoPhasePgStatRecord));
+ }
+ }
+}
+
+/*
+ * PostPrepare_PgStat
+ * Clean up after successful PREPARE.
+ *
+ * All we need do here is unlink the transaction stats state from the
+ * nontransactional state. The nontransactional action counts will be
+ * reported to the stats collector immediately, while the effects on live
+ * and dead tuple counts are preserved in the 2PC state file.
+ *
+ * Note: AtEOXact_PgStat is not called during PREPARE.
+ */
+void
+PostPrepare_PgStat(void)
+{
+ PgStat_SubXactStatus *xact_state;
+
+ /*
+ * We don't bother to free any of the transactional state,
+ * since it's all in TopTransactionContext and will go away anyway.
+ */
+ xact_state = pgStatXactStack;
+ if (xact_state != NULL)
+ {
+ PgStat_TableXactStatus *trans;
+
+ for (trans = xact_state->first; trans != NULL; trans = trans->next)
+ {
+ PgStat_TableStatus *tabstat;
+
+ tabstat = trans->parent;
+ tabstat->trans = NULL;
+ }
+ }
+ pgStatXactStack = NULL;
+
+ /* Make sure any stats snapshot is thrown away */
+ pgstat_clear_snapshot();
+}
+
+/*
+ * 2PC processing routine for COMMIT PREPARED case.
+ *
+ * Load the saved counts into our local pgstats state.
+ */
+void
+pgstat_twophase_postcommit(TransactionId xid, uint16 info,
+ void *recdata, uint32 len)
+{
+ TwoPhasePgStatRecord *rec = (TwoPhasePgStatRecord *) recdata;
+ PgStat_TableStatus *pgstat_info;
+
+ /* Find or create a tabstat entry for the rel */
+ pgstat_info = get_tabstat_entry(rec->t_id, rec->t_shared);
+
+ pgstat_info->t_counts.t_new_live_tuples += rec->tuples_inserted;
+ pgstat_info->t_counts.t_new_dead_tuples += rec->tuples_deleted;
+}
+
+/*
+ * 2PC processing routine for ROLLBACK PREPARED case.
+ *
+ * Load the saved counts into our local pgstats state, but treat them
+ * as aborted.
+ */
+void
+pgstat_twophase_postabort(TransactionId xid, uint16 info,
+ void *recdata, uint32 len)
+{
+ TwoPhasePgStatRecord *rec = (TwoPhasePgStatRecord *) recdata;
+ PgStat_TableStatus *pgstat_info;
+
+ /* Find or create a tabstat entry for the rel */
+ pgstat_info = get_tabstat_entry(rec->t_id, rec->t_shared);
+
+ /* inserted tuples are dead, deleted tuples are no-ops */
+ pgstat_info->t_counts.t_new_dead_tuples += rec->tuples_inserted;
+}
/* ----------
- * pgstat_setheader() -
+ * pgstat_fetch_stat_dbentry() -
*
- * Set common header fields in a statistics message
+ * 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.
* ----------
*/
-static void
-pgstat_setheader(PgStat_MsgHdr *hdr, int mtype)
+PgStat_StatDBEntry *
+pgstat_fetch_stat_dbentry(Oid dbid)
{
- hdr->m_type = mtype;
- hdr->m_backendid = MyBackendId;
- hdr->m_procpid = MyProcPid;
- hdr->m_databaseid = MyDatabaseId;
- hdr->m_userid = GetSessionUserId();
+ /*
+ * 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_send() -
+ * pgstat_fetch_stat_tabentry() -
*
- * Send out one statistics message to the collector
+ * 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.
* ----------
*/
-static void
-pgstat_send(void *msg, int len)
+PgStat_StatTabEntry *
+pgstat_fetch_stat_tabentry(Oid relid)
{
- if (pgStatSock < 0)
- return;
+ Oid dbid;
+ PgStat_StatDBEntry *dbentry;
+ PgStat_StatTabEntry *tabentry;
- ((PgStat_MsgHdr *) msg)->m_size = len;
+ /*
+ * If not done for this transaction, read the statistics collector stats
+ * file into some hash tables.
+ */
+ backend_read_statsfile();
+
+ /*
+ * Lookup our database, then look in its table hash table.
+ */
+ dbid = MyDatabaseId;
+ dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
+ (void *) &dbid,
+ HASH_FIND, NULL);
+ if (dbentry != NULL && dbentry->tables != NULL)
+ {
+ tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
+ (void *) &relid,
+ HASH_FIND, NULL);
+ if (tabentry)
+ return tabentry;
+ }
- send(pgStatSock, msg, len, 0);
- /* We deliberately ignore any error from send() */
+ /*
+ * If we didn't find it, maybe it's a shared table.
+ */
+ dbid = InvalidOid;
+ dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
+ (void *) &dbid,
+ HASH_FIND, NULL);
+ if (dbentry != NULL && dbentry->tables != NULL)
+ {
+ tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
+ (void *) &relid,
+ HASH_FIND, NULL);
+ if (tabentry)
+ return tabentry;
+ }
+
+ return NULL;
}
/* ----------
- * PgstatBufferMain() -
+ * pgstat_fetch_stat_beentry() -
*
- * Start up the statistics buffer process. This is the body of the
- * postmaster child process.
+ * Support function for the SQL-callable pgstat* functions. Returns
+ * our local copy of the current-activity entry for one backend.
*
- * The argc/argv parameters are valid only in EXEC_BACKEND case.
+ * NB: caller is responsible for a check if the user is permitted to see
+ * this info (especially the querystring).
* ----------
*/
-NON_EXEC_STATIC void
-PgstatBufferMain(int argc, char *argv[])
+PgBackendStatus *
+pgstat_fetch_stat_beentry(int beid)
{
- IsUnderPostmaster = true; /* we are a postmaster subprocess now */
+ pgstat_read_current_status();
- MyProcPid = getpid(); /* reset MyProcPid */
+ if (beid < 1 || beid > localNumBackends)
+ return NULL;
- /* Lose the postmaster's on-exit routines */
- on_exit_reset();
+ return &localBackendStatusTable[beid - 1];
+}
- /*
- * Ignore all signals usually bound to some action in the postmaster,
- * except for SIGCHLD --- see pgstat_recvbuffer.
- */
- pqsignal(SIGHUP, SIG_IGN);
- pqsignal(SIGINT, SIG_IGN);
- pqsignal(SIGTERM, SIG_IGN);
- pqsignal(SIGQUIT, SIG_IGN);
- 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 */
-#ifdef EXEC_BACKEND
- pgstat_parseArgs(argc,argv);
-#endif
+/* ----------
+ * pgstat_fetch_stat_numbackends() -
+ *
+ * Support function for the SQL-callable pgstat* functions. Returns
+ * the maximum current backend id.
+ * ----------
+ */
+int
+pgstat_fetch_stat_numbackends(void)
+{
+ pgstat_read_current_status();
- /*
- * 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(LOG,
- (errcode_for_socket_access(),
- errmsg("could not create pipe for statistics buffer: %m")));
- exit(1);
- }
+ return localNumBackends;
+}
-#ifdef EXEC_BACKEND
- /* child becomes collector process */
- switch (pgstat_forkexec(STAT_PROC_COLLECTOR))
-#else
- switch (fork())
-#endif
- {
- case -1:
- ereport(LOG,
- (errmsg("could not fork statistics collector: %m")));
- exit(1);
+/*
+ * ---------
+ * 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();
-#ifndef EXEC_BACKEND
- case 0:
- /* child becomes collector process */
- PgstatCollectorMain(0, NULL);
- break;
-#endif
+ return &globalStats;
+}
- default:
- /* parent becomes buffer process */
- closesocket(pgStatPipe[0]);
- pgstat_recvbuffer();
+
+/* ------------------------------------------------------------
+ * Functions for management of the shared-memory PgBackendStatus array
+ * ------------------------------------------------------------
+ */
+
+static PgBackendStatus *BackendStatusArray = NULL;
+static PgBackendStatus *MyBEEntry = NULL;
+
+
+/*
+ * Report shared-memory space needed by CreateSharedBackendStatus.
+ */
+Size
+BackendStatusShmemSize(void)
+{
+ Size size;
+
+ size = mul_size(sizeof(PgBackendStatus), MaxBackends);
+ return size;
+}
+
+/*
+ * Initialize the shared status array during postmaster startup.
+ */
+void
+CreateSharedBackendStatus(void)
+{
+ Size size = BackendStatusShmemSize();
+ bool found;
+
+ /* Create or attach to the shared array */
+ BackendStatusArray = (PgBackendStatus *)
+ ShmemInitStruct("Backend Status Array", size, &found);
+
+ if (!found)
+ {
+ /*
+ * We're the first - initialize.
+ */
+ MemSet(BackendStatusArray, 0, size);
}
- exit(0);
}
/* ----------
- * PgstatCollectorMain() -
- *
- * Start up the statistics collector itself. This is the body of the
- * postmaster grandchild process.
+ * pgstat_bestart() -
*
- * The argc/argv parameters are valid only in EXEC_BACKEND case.
+ * 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.
* ----------
*/
-NON_EXEC_STATIC void
-PgstatCollectorMain(int argc, char *argv[])
+void
+pgstat_bestart(void)
{
- PgStat_Msg msg;
- fd_set rfds;
- int readPipe;
- int nready;
- int len = 0;
- struct timeval timeout;
- struct timeval next_statwrite;
- bool need_statwrite;
- HASHCTL hash_ctl;
+ volatile PgBackendStatus *beentry;
+ TimestampTz proc_start_timestamp;
+ Oid userid;
+ SockAddr clientaddr;
- MyProcPid = getpid(); /* reset MyProcPid */
+ Assert(MyBackendId >= 1 && MyBackendId <= MaxBackends);
+ MyBEEntry = &BackendStatusArray[MyBackendId - 1];
/*
- * Reset signal handling. With the exception of restoring default
- * SIGCHLD 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.
+ * To minimize the time spent modifying the 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).
*/
- pqsignal(SIGHUP, SIG_IGN);
- pqsignal(SIGINT, SIG_IGN);
- pqsignal(SIGTERM, SIG_IGN);
- pqsignal(SIGQUIT, SIG_IGN);
- 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);
-
-#ifdef EXEC_BACKEND
- pgstat_parseArgs(argc,argv);
-#endif
+ if (MyProcPort)
+ proc_start_timestamp = MyProcPort->SessionStartTime;
+ else
+ proc_start_timestamp = GetCurrentTimestamp();
+ userid = GetSessionUserId();
- /* Close unwanted files */
- closesocket(pgStatPipe[1]);
- closesocket(pgStatSock);
+ /*
+ * We may not have a MyProcPort (eg, if this is the autovacuum process).
+ * If so, use all-zeroes client address, which is dealt with specially in
+ * pg_stat_get_backend_client_addr and pg_stat_get_backend_client_port.
+ */
+ if (MyProcPort)
+ memcpy(&clientaddr, &MyProcPort->raddr, sizeof(clientaddr));
+ else
+ MemSet(&clientaddr, 0, sizeof(clientaddr));
/*
- * Identify myself via ps
+ * 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.
*/
- init_ps_display("stats collector process", "", "");
- set_ps_display("");
+ beentry = MyBEEntry;
+ do
+ {
+ beentry->st_changecount++;
+ } while ((beentry->st_changecount & 1) == 0);
+
+ beentry->st_procpid = MyProcPid;
+ beentry->st_proc_start_timestamp = proc_start_timestamp;
+ beentry->st_activity_start_timestamp = 0;
+ beentry->st_txn_start_timestamp = 0;
+ beentry->st_databaseid = MyDatabaseId;
+ beentry->st_userid = userid;
+ beentry->st_clientaddr = clientaddr;
+ beentry->st_waiting = false;
+ beentry->st_activity[0] = '\0';
+ /* Also make sure the last byte in the string area is always 0 */
+ beentry->st_activity[PGBE_ACTIVITY_SIZE - 1] = '\0';
+
+ beentry->st_changecount++;
+ Assert((beentry->st_changecount & 1) == 0);
/*
- * Initialize filenames needed for status reports.
+ * Set up a process-exit hook to clean up.
*/
- snprintf(pgStat_fname, MAXPGPATH, PGSTAT_STAT_FILENAME, DataDir);
- /* tmpfname need only be set correctly in this process */
- snprintf(pgStat_tmpfname, MAXPGPATH, PGSTAT_STAT_TMPFILE,
- DataDir, getpid());
+ on_shmem_exit(pgstat_beshutdown_hook, 0);
+}
+
+/*
+ * Shut down a single backend's statistics reporting at process exit.
+ *
+ * Flush any remaining statistics counts out to the collector.
+ * Without this, operations triggered during backend exit (such as
+ * temp table deletions) won't be counted.
+ *
+ * Lastly, clear out our entry in the PgBackendStatus array.
+ */
+static void
+pgstat_beshutdown_hook(int code, Datum arg)
+{
+ volatile PgBackendStatus *beentry = MyBEEntry;
+
+ pgstat_report_tabstat(true);
/*
- * Arrange to write the initial status file right away
+ * 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.
*/
- gettimeofday(&next_statwrite, NULL);
- need_statwrite = TRUE;
+ beentry->st_changecount++;
+
+ beentry->st_procpid = 0; /* mark invalid */
+
+ beentry->st_changecount++;
+ Assert((beentry->st_changecount & 1) == 0);
+}
+
+
+/* ----------
+ * pgstat_report_activity() -
+ *
+ * Called from tcop/postgres.c to report what the backend is actually doing
+ * (usually "<IDLE>" or the start of the query to be executed).
+ * ----------
+ */
+void
+pgstat_report_activity(const char *cmd_str)
+{
+ volatile PgBackendStatus *beentry = MyBEEntry;
+ TimestampTz start_timestamp;
+ int len;
+
+ if (!pgstat_collect_querystring || !beentry)
+ return;
/*
- * Read in an existing statistics stats file or initialize the stats
- * to zero.
+ * To minimize the time spent modifying the entry, fetch all the needed
+ * data first.
*/
- pgStatRunningInCollector = TRUE;
- pgstat_read_statsfile(&pgStatDBHash, InvalidOid, NULL, NULL);
+ start_timestamp = GetCurrentStatementStartTimestamp();
+
+ len = strlen(cmd_str);
+ len = pg_mbcliplen(cmd_str, len, PGBE_ACTIVITY_SIZE - 1);
/*
- * Create the dead backend hashtable
+ * 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.
*/
- memset(&hash_ctl, 0, sizeof(hash_ctl));
- hash_ctl.keysize = sizeof(int);
- hash_ctl.entrysize = sizeof(PgStat_StatBeDead);
- hash_ctl.hash = tag_hash;
- pgStatBeDead = hash_create("Dead Backends", PGSTAT_BE_HASH_SIZE,
- &hash_ctl, HASH_ELEM | HASH_FUNCTION);
- if (pgStatBeDead == NULL)
- {
- /* assume the problem is out-of-memory */
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
+ beentry->st_changecount++;
+
+ beentry->st_activity_start_timestamp = start_timestamp;
+ memcpy((char *) beentry->st_activity, cmd_str, len);
+ beentry->st_activity[len] = '\0';
+
+ beentry->st_changecount++;
+ Assert((beentry->st_changecount & 1) == 0);
+}
+
+/*
+ * Set the current transaction start timestamp to the specified
+ * value. If there is no current active transaction, this is signified
+ * by 0.
+ */
+void
+pgstat_report_txn_timestamp(TimestampTz tstamp)
+{
+ volatile PgBackendStatus *beentry = MyBEEntry;
+
+ if (!pgstat_collect_querystring || !beentry)
+ return;
/*
- * Create the known backends table
+ * 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.
*/
- pgStatBeTable = (PgStat_StatBeEntry *) malloc(
- sizeof(PgStat_StatBeEntry) * MaxBackends);
- if (pgStatBeTable == NULL)
- {
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
- memset(pgStatBeTable, 0, sizeof(PgStat_StatBeEntry) * MaxBackends);
+ beentry->st_changecount++;
+ beentry->st_txn_start_timestamp = tstamp;
+ beentry->st_changecount++;
+ Assert((beentry->st_changecount & 1) == 0);
+}
- readPipe = pgStatPipe[0];
+/* ----------
+ * pgstat_report_waiting() -
+ *
+ * Called from lock manager to report beginning or end of a lock wait.
+ *
+ * NB: this *must* be able to survive being called before MyBEEntry has been
+ * initialized.
+ * ----------
+ */
+void
+pgstat_report_waiting(bool waiting)
+{
+ volatile PgBackendStatus *beentry = MyBEEntry;
+
+ if (!pgstat_collect_querystring || !beentry)
+ return;
/*
- * Process incoming messages and handle all the reporting stuff until
- * there are no more messages.
+ * 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.
*/
- for (;;)
- {
- /*
- * If we need to write the status file again (there have been
- * changes in the statistics since we wrote it last) calculate the
- * timeout until we have to do so.
- */
- if (need_statwrite)
- {
- struct timeval now;
+ beentry->st_waiting = waiting;
+}
- gettimeofday(&now, NULL);
- /* avoid assuming that tv_sec is signed */
- if (now.tv_sec > next_statwrite.tv_sec ||
- (now.tv_sec == next_statwrite.tv_sec &&
- now.tv_usec >= next_statwrite.tv_usec))
- {
- timeout.tv_sec = 0;
- timeout.tv_usec = 0;
- }
- else
- {
- timeout.tv_sec = next_statwrite.tv_sec - now.tv_sec;
- timeout.tv_usec = next_statwrite.tv_usec - now.tv_usec;
- if (timeout.tv_usec < 0)
- {
- timeout.tv_sec--;
- timeout.tv_usec += 1000000;
- }
- }
- }
- /*
- * Setup the descriptor set for select(2)
- */
- FD_ZERO(&rfds);
- FD_SET(readPipe, &rfds);
+/* ----------
+ * pgstat_read_current_status() -
+ *
+ * Copy the current contents of the PgBackendStatus array to local memory,
+ * if not already done in this transaction.
+ * ----------
+ */
+static void
+pgstat_read_current_status(void)
+{
+ volatile PgBackendStatus *beentry;
+ PgBackendStatus *localtable;
+ PgBackendStatus *localentry;
+ int i;
- /*
- * Now wait for something to do.
- */
- nready = select(readPipe+1, &rfds, NULL, NULL,
- (need_statwrite) ? &timeout : NULL);
- if (nready < 0)
- {
- if (errno == EINTR)
- continue;
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("select() failed in statistics collector: %m")));
- exit(1);
- }
+ Assert(!pgStatRunningInCollector);
+ if (localBackendStatusTable)
+ return; /* already done */
- /*
- * If there are no descriptors ready, our timeout for writing the
- * stats file happened.
- */
- if (nready == 0)
- {
- pgstat_write_statsfile();
- need_statwrite = FALSE;
+ pgstat_setup_memcxt();
- continue;
- }
+ localtable = (PgBackendStatus *)
+ MemoryContextAlloc(pgStatLocalContext,
+ sizeof(PgBackendStatus) * MaxBackends);
+ localNumBackends = 0;
+ beentry = BackendStatusArray;
+ localentry = localtable;
+ for (i = 1; i <= MaxBackends; i++)
+ {
/*
- * Check if there is a new statistics message to collect.
+ * 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.
*/
- if (FD_ISSET(readPipe, &rfds))
+ for (;;)
{
- /*
- * 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;
-
- while (nread < targetlen)
- {
- len = piperead(readPipe, ((char *) &msg) + nread,
- targetlen - nread);
- if (len < 0)
- {
- if (errno == EINTR)
- continue;
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("could not read from statistics collector pipe: %m")));
- exit(1);
- }
- 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(LOG,
- (errmsg("invalid statistics message length")));
- exit(1);
- }
- }
- }
+ int save_changecount = beentry->st_changecount;
/*
- * EOF on the pipe implies that the buffer process exited.
- * Fall out of outer loop.
+ * XXX if PGBE_ACTIVITY_SIZE is really large, it might be best to
+ * use strcpy not memcpy for copying the activity string?
*/
- if (pipeEOF)
+ memcpy(localentry, (char *) beentry, sizeof(PgBackendStatus));
+
+ if (save_changecount == beentry->st_changecount &&
+ (save_changecount & 1) == 0)
break;
- /*
- * Distribute the message to the specific function handling
- * it.
- */
- switch (msg.msg_hdr.m_type)
- {
- case PGSTAT_MTYPE_DUMMY:
- break;
+ /* Make sure we can break out of loop if stuck... */
+ CHECK_FOR_INTERRUPTS();
+ }
- case PGSTAT_MTYPE_BESTART:
- pgstat_recv_bestart((PgStat_MsgBestart *) &msg, nread);
- break;
+ beentry++;
+ /* Only valid entries get included into the local array */
+ if (localentry->st_procpid > 0)
+ {
+ localentry++;
+ localNumBackends++;
+ }
+ }
- case PGSTAT_MTYPE_BETERM:
- pgstat_recv_beterm((PgStat_MsgBeterm *) &msg, nread);
- break;
+ /* Set the pointer only after completion of a valid table */
+ localBackendStatusTable = localtable;
+}
- case PGSTAT_MTYPE_TABSTAT:
- pgstat_recv_tabstat((PgStat_MsgTabstat *) &msg, nread);
- break;
- case PGSTAT_MTYPE_TABPURGE:
- pgstat_recv_tabpurge((PgStat_MsgTabpurge *) &msg, nread);
- break;
+/* ------------------------------------------------------------
+ * Local support functions follow
+ * ------------------------------------------------------------
+ */
+
+
+/* ----------
+ * pgstat_setheader() -
+ *
+ * Set common header fields in a statistics message
+ * ----------
+ */
+static void
+pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype)
+{
+ hdr->m_type = mtype;
+}
+
+
+/* ----------
+ * pgstat_send() -
+ *
+ * Send out one statistics message to the collector
+ * ----------
+ */
+static void
+pgstat_send(void *msg, int len)
+{
+ int rc;
- case PGSTAT_MTYPE_ACTIVITY:
- pgstat_recv_activity((PgStat_MsgActivity *) &msg, nread);
- break;
+ if (pgStatSock < 0)
+ return;
- case PGSTAT_MTYPE_DROPDB:
- pgstat_recv_dropdb((PgStat_MsgDropdb *) &msg, nread);
- break;
+ ((PgStat_MsgHdr *) msg)->m_size = len;
- case PGSTAT_MTYPE_RESETCOUNTER:
- pgstat_recv_resetcounter((PgStat_MsgResetcounter *) &msg,
- nread);
- break;
+ /* We'll retry after EINTR, but ignore all other failures */
+ do
+ {
+ rc = send(pgStatSock, msg, len, 0);
+ } while (rc < 0 && errno == EINTR);
- default:
- break;
- }
+#ifdef USE_ASSERT_CHECKING
+ /* In debug builds, log send failures ... */
+ if (rc < 0)
+ elog(LOG, "could not send to statistics collector: %m");
+#endif
+}
- /*
- * Globally count messages.
- */
- pgStatNumMessages++;
+/* ----------
+ * 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;
- /*
- * If this is the first message after we wrote the stats file
- * the last time, setup the timeout that it'd be written.
- */
- if (!need_statwrite)
- {
- gettimeofday(&next_statwrite, NULL);
- next_statwrite.tv_usec += ((PGSTAT_STAT_INTERVAL) * 1000);
- next_statwrite.tv_sec += (next_statwrite.tv_usec / 1000000);
- next_statwrite.tv_usec %= 1000000;
- need_statwrite = TRUE;
- }
- }
+ /*
+ * This function can be called even if nothing at all has happened.
+ * In this case, avoid sending a completely empty message to
+ * the stats collector.
+ */
+ if (memcmp(&BgWriterStats, &all_zeroes, sizeof(PgStat_MsgBgWriter)) == 0)
+ return;
- /*
- * 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.
- */
- }
+ /*
+ * Prepare and send the message
+ */
+ pgstat_setheader(&BgWriterStats.m_hdr, PGSTAT_MTYPE_BGWRITER);
+ pgstat_send(&BgWriterStats, sizeof(BgWriterStats));
/*
- * 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).
+ * Clear out the statistics buffer, so it can be re-used.
*/
- if (!PostmasterIsAlive(false))
- pgstat_write_statsfile();
+ MemSet(&BgWriterStats, 0, sizeof(BgWriterStats));
}
/* ----------
- * pgstat_recvbuffer() -
+ * PgstatCollectorMain() -
*
- * 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.
+ * Start up the statistics collector process. This is the body of the
+ * postmaster child process.
+ *
+ * The argc/argv parameters are valid only in EXEC_BACKEND case.
* ----------
*/
-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 nready;
+ struct itimerval write_timeout;
+ bool need_timer = false;
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 */
/*
- * 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 and SIGALRM.
*/
- pqsignal(SIGPIPE, SIG_DFL);
+ pqsignal(SIGHUP, SIG_IGN);
+ pqsignal(SIGINT, SIG_IGN);
+ pqsignal(SIGTERM, SIG_IGN);
+ pqsignal(SIGQUIT, pgstat_exit);
+ 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);
/*
- * Set the write pipe to nonblock mode, so that we cannot block when
- * the collector falls behind.
+ * Identify myself via ps
*/
- if (!set_noblock(writePipe))
- {
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("could not set statistics collector pipe to nonblocking mode: %m")));
- exit(1);
- }
+ init_ps_display("stats collector process", "", "", "");
/*
- * Allocate the message buffer
+ * Arrange to write the initial status file right away
*/
- msgbuffer = (char *) malloc(PGSTAT_RECVBUFFERSZ);
- if (msgbuffer == NULL)
- {
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
+ need_statwrite = true;
+
+ /* Preset the delay between status file writes */
+ MemSet(&write_timeout, 0, sizeof(struct itimerval));
+ write_timeout.it_value.tv_sec = PGSTAT_STAT_INTERVAL / 1000;
+ write_timeout.it_value.tv_usec = (PGSTAT_STAT_INTERVAL % 1000) * 1000;
+
+ /*
+ * Read in an existing statistics stats file or initialize the stats to
+ * zero.
+ */
+ pgStatRunningInCollector = true;
+ pgStatDBHash = pgstat_read_statsfile(InvalidOid);
/*
- * Loop forever
+ * Setup the descriptor set for select(2). Since only one bit in the set
+ * ever changes, we need not repeat FD_ZERO each time.
+ */
+#if !defined(HAVE_POLL) && !defined(WIN32)
+ FD_ZERO(&rfds);
+#endif
+
+ /*
+ * Loop to process messages until we get SIGQUIT or detect ungraceful
+ * death of our parent postmaster.
+ *
+ * For performance reasons, we don't want to do a PostmasterIsAlive() test
+ * after every message; instead, do it at statwrite time and if
+ * select()/poll() is interrupted by timeout.
*/
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;
+
+ /*
+ * 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.
+ */
+ if (need_statwrite)
{
- if (!overflow)
- {
- ereport(LOG,
- (errmsg("statistics buffer is full")));
- overflow = true;
- }
+ /* Check for postmaster death; if so we'll write file below */
+ if (!PostmasterIsAlive(true))
+ break;
+
+ pgstat_write_statsfile();
+ need_statwrite = false;
+ need_timer = true;
}
/*
- * If we have messages to write out, we add the pipe to the write
- * descriptor set.
+ * 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 postmaster
- * termination).
+ * 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;
- nready = select(maxfd + 1, &rfds, &wfds, NULL, &timeout);
- if (nready < 0)
+ if (select(pgStatSock + 1, &rfds, NULL, NULL, &sel_timeout) < 0)
{
if (errno == EINTR)
continue;
- ereport(LOG,
+ ereport(ERROR,
(errcode_for_socket_access(),
- errmsg("select() failed in statistics buffer: %m")));
- exit(1);
+ 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)
{
- ereport(LOG,
+ if (errno == EINTR)
+ continue;
+ ereport(ERROR,
(errcode_for_socket_access(),
- errmsg("could not read statistics message: %m")));
- exit(1);
+ errmsg("could not read statistics message: %m")));
}
/*
/*
* 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_TABSTAT:
+ pgstat_recv_tabstat((PgStat_MsgTabstat *) &msg, len);
+ break;
+
+ case PGSTAT_MTYPE_TABPURGE:
+ pgstat_recv_tabpurge((PgStat_MsgTabpurge *) &msg, len);
+ break;
+
+ case PGSTAT_MTYPE_DROPDB:
+ pgstat_recv_dropdb((PgStat_MsgDropdb *) &msg, len);
+ break;
+
+ case PGSTAT_MTYPE_RESETCOUNTER:
+ pgstat_recv_resetcounter((PgStat_MsgResetcounter *) &msg,
+ len);
+ break;
+
+ case PGSTAT_MTYPE_AUTOVAC_START:
+ pgstat_recv_autovac((PgStat_MsgAutovacStart *) &msg, len);
+ break;
+
+ case PGSTAT_MTYPE_VACUUM:
+ pgstat_recv_vacuum((PgStat_MsgVacuum *) &msg, len);
+ break;
+
+ case PGSTAT_MTYPE_ANALYZE:
+ pgstat_recv_analyze((PgStat_MsgAnalyze *) &msg, len);
+ break;
+
+ case PGSTAT_MTYPE_BGWRITER:
+ pgstat_recv_bgwriter((PgStat_MsgBgWriter *) &msg, len);
+ break;
+
+ 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))
- {
- 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 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 (errno == EINTR || errno == EAGAIN)
- continue; /* not enough space in pipe */
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("could not write to statistics collector pipe: %m")));
- exit(1);
+ if (setitimer(ITIMER_REAL, &write_timeout, NULL))
+ ereport(ERROR,
+ (errmsg("could not set statistics collector timer: %m")));
+ need_timer = false;
}
- /* NB: len < xfr is okay */
- msg_send += len;
- if (msg_send == PGSTAT_RECVBUFFERSZ)
- msg_send = 0;
- msg_have -= len;
}
+ else
+ {
+ /*
+ * We can only get here if the select/poll timeout elapsed. Check
+ * for postmaster death.
+ */
+ if (!PostmasterIsAlive(true))
+ break;
+ }
+ } /* end of message-processing loop */
- /*
- * 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();
- /*
- * If the postmaster has terminated, we've done our job.
- */
- if (!PostmasterIsAlive(true))
- exit(0);
- }
+ exit(0);
}
+
+/* SIGQUIT signal handler for collector process */
static void
-pgstat_die(SIGNAL_ARGS)
+pgstat_exit(SIGNAL_ARGS)
{
- exit(1);
+ need_exit = true;
}
+/* SIGALRM signal handler for collector process */
+static void
+force_statwrite(SIGNAL_ARGS)
+{
+ need_statwrite = true;
+}
-/* ----------
- * pgstat_add_backend() -
- *
- * Support function to keep our backend list up to date.
- * ----------
+
+/*
+ * Lookup the hash table entry for the specified database. If no hash
+ * table entry exists, initialize it, if the create parameter is true.
+ * Else, return NULL.
*/
-static int
-pgstat_add_backend(PgStat_MsgHdr *msg)
+static PgStat_StatDBEntry *
+pgstat_get_db_entry(Oid databaseid, bool create)
{
- PgStat_StatDBEntry *dbentry;
- PgStat_StatBeEntry *beentry;
- PgStat_StatBeDead *deadbe;
+ PgStat_StatDBEntry *result;
bool found;
+ HASHACTION action = (create ? HASH_ENTER : HASH_FIND);
- /*
- * Check that the backend ID is valid
- */
- if (msg->m_backendid < 1 || msg->m_backendid > MaxBackends)
- {
- ereport(LOG,
- (errmsg("invalid server process ID %d", msg->m_backendid)));
- return -1;
- }
-
- /*
- * Get the slot for this backendid.
- */
- beentry = &pgStatBeTable[msg->m_backendid - 1];
- if (beentry->databaseid != InvalidOid)
- {
- /*
- * If the slot contains the PID of this backend, everything is
- * fine and we got nothing to do.
- */
- if (beentry->procpid == msg->m_procpid)
- return 0;
- }
-
- /*
- * Lookup if this backend is known to be dead. This can be caused due
- * to messages arriving in the wrong order - i.e. Postmaster's BETERM
- * message might have arrived before we received all the backends
- * stats messages, or even a new backend with the same backendid was
- * faster in sending his BESTART.
- *
- * If the backend is known to be dead, we ignore this add.
- */
- deadbe = (PgStat_StatBeDead *) hash_search(pgStatBeDead,
- (void *) &(msg->m_procpid),
- HASH_FIND, NULL);
- if (deadbe)
- return 1;
-
- /*
- * Backend isn't known to be dead. If it's slot is currently used, we
- * have to kick out the old backend.
- */
- if (beentry->databaseid != InvalidOid)
- pgstat_sub_backend(beentry->procpid);
-
- /*
- * Put this new backend into the slot.
- */
- beentry->databaseid = msg->m_databaseid;
- beentry->procpid = msg->m_procpid;
- beentry->userid = msg->m_userid;
- beentry->activity_start_sec = 0;
- beentry->activity_start_usec = 0;
- MemSet(beentry->activity, 0, PGSTAT_ACTIVITY_SIZE);
+ /* Lookup or create the hash table entry for this database */
+ result = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
+ &databaseid,
+ action, &found);
- /*
- * Lookup or create the database entry for this backends DB.
- */
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &(msg->m_databaseid),
- HASH_ENTER, &found);
- if (dbentry == NULL)
- {
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
+ if (!create && !found)
+ return NULL;
- /*
- * If not found, initialize the new one.
- */
+ /* If not found, initialize the new one. */
if (!found)
{
HASHCTL hash_ctl;
- dbentry->tables = NULL;
- dbentry->n_xact_commit = 0;
- dbentry->n_xact_rollback = 0;
- dbentry->n_blocks_fetched = 0;
- dbentry->n_blocks_hit = 0;
- dbentry->n_connects = 0;
- dbentry->destroy = 0;
+ result->tables = NULL;
+ result->n_xact_commit = 0;
+ result->n_xact_rollback = 0;
+ result->n_blocks_fetched = 0;
+ result->n_blocks_hit = 0;
+ result->n_tuples_returned = 0;
+ result->n_tuples_fetched = 0;
+ result->n_tuples_inserted = 0;
+ result->n_tuples_updated = 0;
+ result->n_tuples_deleted = 0;
+ result->last_autovac_time = 0;
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
- hash_ctl.hash = tag_hash;
- dbentry->tables = hash_create("Per-database table",
- PGSTAT_TAB_HASH_SIZE,
- &hash_ctl,
- HASH_ELEM | HASH_FUNCTION);
- if (dbentry->tables == NULL)
- {
- /* assume the problem is out-of-memory */
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
- }
-
- /*
- * Count number of connects to the database
- */
- dbentry->n_connects++;
-
- return 0;
-}
-
-
-/* ----------
- * pgstat_sub_backend() -
- *
- * Remove a backend from the actual backends list.
- * ----------
- */
-static void
-pgstat_sub_backend(int procpid)
-{
- int i;
- PgStat_StatBeDead *deadbe;
- bool found;
-
- /*
- * Search in the known-backends table for the slot containing this
- * PID.
- */
- for (i = 0; i < MaxBackends; i++)
- {
- if (pgStatBeTable[i].databaseid != InvalidOid &&
- pgStatBeTable[i].procpid == procpid)
- {
- /*
- * That's him. Add an entry to the known to be dead backends.
- * Due to possible misorder in the arrival of UDP packets it's
- * possible that even if we know the backend is dead, there
- * could still be messages queued that arrive later. Those
- * messages must not cause our number of backends statistics
- * to get screwed up, so we remember for a couple of seconds
- * that this PID is dead and ignore them (only the counting of
- * backends, not the table access stats they sent).
- */
- deadbe = (PgStat_StatBeDead *) hash_search(pgStatBeDead,
- (void *) &procpid,
- HASH_ENTER,
- &found);
- if (deadbe == NULL)
- {
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
- if (!found)
- {
- deadbe->backendid = i + 1;
- deadbe->destroy = PGSTAT_DESTROY_COUNT;
- }
-
- /*
- * Declare the backend slot empty.
- */
- pgStatBeTable[i].databaseid = InvalidOid;
- return;
- }
+ hash_ctl.hash = oid_hash;
+ result->tables = hash_create("Per-database table",
+ PGSTAT_TAB_HASH_SIZE,
+ &hash_ctl,
+ HASH_ELEM | HASH_FUNCTION);
}
- /*
- * No big problem if not found. This can happen if UDP messages arrive
- * out of order here.
- */
+ return result;
}
HASH_SEQ_STATUS tstat;
PgStat_StatDBEntry *dbentry;
PgStat_StatTabEntry *tabentry;
- PgStat_StatBeDead *deadbe;
FILE *fpout;
- int i;
+ int32 format_id;
/*
* Open the statistics temp file to write out the current values.
*/
- fpout = fopen(pgStat_tmpfname, PG_BINARY_W);
+ fpout = fopen(PGSTAT_STAT_TMPFILE, PG_BINARY_W);
if (fpout == NULL)
{
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not open temporary statistics file \"%s\": %m",
- pgStat_tmpfname)));
+ PGSTAT_STAT_TMPFILE)));
return;
}
+ /*
+ * 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)
{
/*
- * If this database is marked destroyed, count down and do so if
- * it reaches 0.
- */
- if (dbentry->destroy > 0)
- {
- if (--(dbentry->destroy) == 0)
- {
- if (dbentry->tables != NULL)
- hash_destroy(dbentry->tables);
-
- if (hash_search(pgStatDBHash,
- (void *) &(dbentry->databaseid),
- HASH_REMOVE, NULL) == NULL)
- {
- ereport(LOG,
- (errmsg("database hash table corrupted "
- "during cleanup --- abort")));
- exit(1);
- }
- }
-
- /*
- * Don't include statistics for it.
- */
- continue;
- }
-
- /*
- * Write out the DB line including the number of life backends.
+ * 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.
*/
fputc('D', fpout);
- fwrite(dbentry, sizeof(PgStat_StatDBEntry), 1, fpout);
+ fwrite(dbentry, offsetof(PgStat_StatDBEntry, tables), 1, fpout);
/*
- * Walk through the databases access stats per table.
+ * Walk through the database's access stats per table.
*/
hash_seq_init(&tstat, dbentry->tables);
while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&tstat)) != NULL)
{
- /*
- * If table entry marked for destruction, same as above for
- * the database entry.
- */
- if (tabentry->destroy > 0)
- {
- if (--(tabentry->destroy) == 0)
- {
- if (hash_search(dbentry->tables,
- (void *) &(tabentry->tableid),
- HASH_REMOVE, NULL) == NULL)
- {
- ereport(LOG,
- (errmsg("tables hash table for "
- "database %u corrupted during "
- "cleanup --- abort",
- dbentry->databaseid)));
- exit(1);
- }
- }
- continue;
- }
-
- /*
- * At least we think this is still a life table. Print it's
- * access stats.
- */
fputc('T', fpout);
fwrite(tabentry, sizeof(PgStat_StatTabEntry), 1, fpout);
}
fputc('d', fpout);
}
- /*
- * Write out the known running backends to the stats file.
- */
- i = MaxBackends;
- fputc('M', fpout);
- fwrite(&i, sizeof(i), 1, fpout);
-
- for (i = 0; i < MaxBackends; i++)
- {
- if (pgStatBeTable[i].databaseid != InvalidOid)
- {
- fputc('B', fpout);
- fwrite(&pgStatBeTable[i], sizeof(PgStat_StatBeEntry), 1, fpout);
- }
- }
-
/*
* No more output to be done. Close the temp file and replace the old
- * pgstat.stat with it.
+ * pgstat.stat with it. The ferror() check replaces testing for error
+ * after each individual fputc or fwrite above.
*/
fputc('E', fpout);
- if (fclose(fpout) < 0)
+
+ if (ferror(fpout))
{
ereport(LOG,
(errcode_for_file_access(),
- errmsg("could not close temporary statistics file \"%s\": %m",
- pgStat_tmpfname)));
+ errmsg("could not write temporary statistics file \"%s\": %m",
+ PGSTAT_STAT_TMPFILE)));
+ fclose(fpout);
+ unlink(PGSTAT_STAT_TMPFILE);
}
- else
+ else if (fclose(fpout) < 0)
{
- if (rename(pgStat_tmpfname, pgStat_fname) < 0)
- {
- ereport(LOG,
- (errcode_for_file_access(),
- errmsg("could not rename temporary statistics file \"%s\" to \"%s\": %m",
- pgStat_tmpfname, pgStat_fname)));
- }
+ ereport(LOG,
+ (errcode_for_file_access(),
+ errmsg("could not close temporary statistics file \"%s\": %m",
+ PGSTAT_STAT_TMPFILE)));
+ unlink(PGSTAT_STAT_TMPFILE);
}
-
- /*
- * Clear out the dead backends table
- */
- hash_seq_init(&hstat, pgStatBeDead);
- while ((deadbe = (PgStat_StatBeDead *) hash_seq_search(&hstat)) != NULL)
+ else if (rename(PGSTAT_STAT_TMPFILE, PGSTAT_STAT_FILENAME) < 0)
{
- /*
- * Count down the destroy delay and remove entries where it
- * reaches 0.
- */
- if (--(deadbe->destroy) <= 0)
- {
- if (hash_search(pgStatBeDead,
- (void *) &(deadbe->procpid),
- HASH_REMOVE, NULL) == NULL)
- {
- ereport(LOG,
- (errmsg("dead-server-process hash table corrupted "
- "during cleanup --- abort")));
- exit(1);
- }
- }
+ 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);
}
}
/* ----------
* pgstat_read_statsfile() -
*
- * Reads in an existing statistics collector and initializes the
- * databases hash table (who's entries point to the tables hash tables)
- * and the current backend table.
+ * Reads in an existing statistics collector file and initializes the
+ * databases' hash table (whose entries point to the tables' hash tables).
* ----------
*/
-static void
-pgstat_read_statsfile(HTAB **dbhash, Oid onlydb,
- PgStat_StatBeEntry **betab, int *numbackends)
+static HTAB *
+pgstat_read_statsfile(Oid onlydb)
{
PgStat_StatDBEntry *dbentry;
PgStat_StatDBEntry dbbuf;
PgStat_StatTabEntry *tabentry;
PgStat_StatTabEntry tabbuf;
HASHCTL hash_ctl;
+ HTAB *dbhash;
HTAB *tabhash = NULL;
FILE *fpin;
- int maxbackends = 0;
- int havebackends = 0;
+ int32 format_id;
bool found;
- MemoryContext use_mcxt;
- int mcxt_flags;
/*
- * If running in the collector 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)
- {
- use_mcxt = NULL;
- mcxt_flags = 0;
- }
- else
- {
- use_mcxt = TopTransactionContext;
- mcxt_flags = HASH_CONTEXT;
- }
+ pgstat_setup_memcxt();
/*
* Create the DB hashtable
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(PgStat_StatDBEntry);
- hash_ctl.hash = tag_hash;
- hash_ctl.hcxt = use_mcxt;
- *dbhash = hash_create("Databases hash", PGSTAT_DB_HASH_SIZE, &hash_ctl,
- HASH_ELEM | HASH_FUNCTION | mcxt_flags);
- if (*dbhash == NULL)
- {
- /* assume the problem is out-of-memory */
- if (pgStatRunningInCollector)
- {
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
- /* in backend, can do normal error */
- ereport(ERROR,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory")));
- }
+ hash_ctl.hash = oid_hash;
+ hash_ctl.hcxt = pgStatLocalContext;
+ dbhash = hash_create("Databases hash", PGSTAT_DB_HASH_SIZE, &hash_ctl,
+ HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
/*
- * Initialize the number of known backends to zero, just in case we do
- * a silent error return below.
+ * Clear out global statistics so they start from zero in case we can't
+ * load an existing statsfile.
*/
- if (numbackends != NULL)
- *numbackends = 0;
- if (betab != NULL)
- *betab = NULL;
+ memset(&globalStats, 0, sizeof(globalStats));
/*
- * In EXEC_BACKEND case, we won't have inherited pgStat_fname from
- * postmaster, so compute it first time through.
+ * 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.
*/
-#ifdef EXEC_BACKEND
- if (pgStat_fname[0] == '\0')
+ if ((fpin = AllocateFile(PGSTAT_STAT_FILENAME, PG_BINARY_R)) == NULL)
+ return dbhash;
+
+ /*
+ * Verify it's of the expected format.
+ */
+ if (fread(&format_id, 1, sizeof(format_id), fpin) != sizeof(format_id)
+ || format_id != PGSTAT_FILE_FORMAT_ID)
{
- Assert(DataDir != NULL);
- snprintf(pgStat_fname, MAXPGPATH, PGSTAT_STAT_FILENAME, DataDir);
+ ereport(pgStatRunningInCollector ? LOG : WARNING,
+ (errmsg("corrupted pgstat.stat file")));
+ goto done;
}
-#endif
/*
- * 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.
+ * Read global stats struct
*/
- if ((fpin = fopen(pgStat_fname, PG_BINARY_R)) == NULL)
- return;
+ if (fread(&globalStats, 1, sizeof(globalStats), fpin) != sizeof(globalStats))
+ {
+ ereport(pgStatRunningInCollector ? LOG : WARNING,
+ (errmsg("corrupted pgstat.stat file")));
+ goto done;
+ }
/*
* We found an existing collector stats file. Read it and put all the
{
/*
* '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' entries will follow
+ * until a 'd' is encountered.
*/
case 'D':
- if (fread(&dbbuf, 1, sizeof(dbbuf), fpin) != sizeof(dbbuf))
+ if (fread(&dbbuf, 1, offsetof(PgStat_StatDBEntry, tables),
+ fpin) != offsetof(PgStat_StatDBEntry, tables))
{
ereport(pgStatRunningInCollector ? LOG : WARNING,
(errmsg("corrupted pgstat.stat file")));
- fclose(fpin);
- return;
+ goto done;
}
/*
* Add to the DB hash
*/
- dbentry = (PgStat_StatDBEntry *) hash_search(*dbhash,
- (void *) &dbbuf.databaseid,
+ dbentry = (PgStat_StatDBEntry *) hash_search(dbhash,
+ (void *) &dbbuf.databaseid,
HASH_ENTER,
&found);
- if (dbentry == NULL)
- {
- if (pgStatRunningInCollector)
- {
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
- else
- {
- fclose(fpin);
- ereport(ERROR,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory")));
- }
- }
if (found)
{
ereport(pgStatRunningInCollector ? LOG : WARNING,
(errmsg("corrupted pgstat.stat file")));
- fclose(fpin);
- return;
+ goto done;
}
memcpy(dbentry, &dbbuf, sizeof(PgStat_StatDBEntry));
dbentry->tables = NULL;
- dbentry->destroy = 0;
- dbentry->n_backends = 0;
/*
- * Don't collect tables if not the requested DB
+ * Don't collect tables if not the requested DB (or the
+ * shared-table info)
*/
- if (onlydb != InvalidOid && onlydb != dbbuf.databaseid)
- break;
+ if (onlydb != InvalidOid)
+ {
+ if (dbbuf.databaseid != onlydb &&
+ dbbuf.databaseid != InvalidOid)
+ break;
+ }
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
- hash_ctl.hash = tag_hash;
- hash_ctl.hcxt = use_mcxt;
+ hash_ctl.hash = oid_hash;
+ hash_ctl.hcxt = pgStatLocalContext;
dbentry->tables = hash_create("Per-database table",
PGSTAT_TAB_HASH_SIZE,
&hash_ctl,
- HASH_ELEM | HASH_FUNCTION | mcxt_flags);
- if (dbentry->tables == NULL)
- {
- /* assume the problem is out-of-memory */
- if (pgStatRunningInCollector)
- {
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
- /* in backend, can do normal error */
- fclose(fpin);
- ereport(ERROR,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory")));
- }
+ HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
/*
- * Arrange that following 'T's add entries to this
- * databases tables hash table.
+ * Arrange that following 'T's add entries to this database's
+ * tables hash table.
*/
tabhash = dbentry->tables;
break;
* 'T' A PgStat_StatTabEntry follows.
*/
case 'T':
- if (fread(&tabbuf, 1, sizeof(tabbuf), fpin) != sizeof(tabbuf))
+ if (fread(&tabbuf, 1, sizeof(PgStat_StatTabEntry),
+ fpin) != sizeof(PgStat_StatTabEntry))
{
ereport(pgStatRunningInCollector ? LOG : WARNING,
(errmsg("corrupted pgstat.stat file")));
- fclose(fpin);
- return;
+ goto done;
}
/*
break;
tabentry = (PgStat_StatTabEntry *) hash_search(tabhash,
- (void *) &tabbuf.tableid,
- HASH_ENTER, &found);
- if (tabentry == NULL)
- {
- if (pgStatRunningInCollector)
- {
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
- /* in backend, can do normal error */
- fclose(fpin);
- ereport(ERROR,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory")));
- }
+ (void *) &tabbuf.tableid,
+ HASH_ENTER, &found);
if (found)
{
ereport(pgStatRunningInCollector ? LOG : WARNING,
(errmsg("corrupted pgstat.stat file")));
- fclose(fpin);
- return;
+ goto done;
}
memcpy(tabentry, &tabbuf, sizeof(tabbuf));
break;
- /*
- * 'M' The maximum number of backends to expect follows.
- */
- case 'M':
- if (betab == NULL || numbackends == NULL)
- {
- fclose(fpin);
- return;
- }
- if (fread(&maxbackends, 1, sizeof(maxbackends), fpin) !=
- sizeof(maxbackends))
- {
- ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted pgstat.stat file")));
- fclose(fpin);
- return;
- }
- if (maxbackends == 0)
- {
- fclose(fpin);
- return;
- }
-
- /*
- * Allocate space (in TopTransactionContext too) for the
- * backend table.
- */
- if (use_mcxt == NULL)
- *betab = (PgStat_StatBeEntry *) malloc(
- sizeof(PgStat_StatBeEntry) * maxbackends);
- else
- *betab = (PgStat_StatBeEntry *) MemoryContextAlloc(
- use_mcxt,
- sizeof(PgStat_StatBeEntry) * maxbackends);
- break;
-
- /*
- * 'B' A PgStat_StatBeEntry follows.
- */
- case 'B':
- if (betab == NULL || numbackends == NULL)
- {
- fclose(fpin);
- return;
- }
- if (*betab == NULL)
- {
- fclose(fpin);
- return;
- }
-
- /*
- * Read it directly into the table.
- */
- if (fread(&(*betab)[havebackends], 1,
- sizeof(PgStat_StatBeEntry), fpin) !=
- sizeof(PgStat_StatBeEntry))
- {
- ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted pgstat.stat file")));
- fclose(fpin);
- return;
- }
-
- /*
- * Count backends per database here.
- */
- dbentry = (PgStat_StatDBEntry *) hash_search(*dbhash,
- (void *) &((*betab)[havebackends].databaseid),
- HASH_FIND, NULL);
- if (dbentry)
- dbentry->n_backends++;
-
- havebackends++;
- if (numbackends != 0)
- *numbackends = havebackends;
- if (havebackends >= maxbackends)
- {
- fclose(fpin);
- return;
- }
- break;
-
/*
* 'E' The EOF marker of a complete stats file.
*/
case 'E':
- fclose(fpin);
- return;
+ goto done;
default:
ereport(pgStatRunningInCollector ? LOG : WARNING,
(errmsg("corrupted pgstat.stat file")));
- fclose(fpin);
- return;
+ goto done;
}
}
- fclose(fpin);
-}
+done:
+ FreeFile(fpin);
+ return dbhash;
+}
-/* ----------
- * pgstat_recv_bestart() -
- *
- * Process a backend starup message.
- * ----------
+/*
+ * 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
-pgstat_recv_bestart(PgStat_MsgBestart *msg, int len)
+backend_read_statsfile(void)
{
- pgstat_add_backend(&msg->m_hdr);
+ /* already read it? */
+ if (pgStatDBHash)
+ return;
+ Assert(!pgStatRunningInCollector);
+
+ /* Autovacuum launcher wants stats about all databases */
+ if (IsAutoVacuumLauncherProcess())
+ pgStatDBHash = pgstat_read_statsfile(InvalidOid);
+ else
+ pgStatDBHash = pgstat_read_statsfile(MyDatabaseId);
}
/* ----------
- * pgstat_recv_beterm() -
+ * pgstat_setup_memcxt() -
*
- * Process a backend termination message.
+ * Create pgStatLocalContext, if not already done.
* ----------
*/
static void
-pgstat_recv_beterm(PgStat_MsgBeterm *msg, int len)
+pgstat_setup_memcxt(void)
{
- pgstat_sub_backend(msg->m_hdr.m_procpid);
+ if (!pgStatLocalContext)
+ pgStatLocalContext = AllocSetContextCreate(TopMemoryContext,
+ "Statistics snapshot",
+ ALLOCSET_SMALL_MINSIZE,
+ ALLOCSET_SMALL_INITSIZE,
+ ALLOCSET_SMALL_MAXSIZE);
}
/* ----------
- * pgstat_recv_activity() -
+ * pgstat_clear_snapshot() -
*
- * Remember what the backend is doing.
+ * 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.
* ----------
*/
-static void
-pgstat_recv_activity(PgStat_MsgActivity *msg, int len)
+void
+pgstat_clear_snapshot(void)
{
- PgStat_StatBeEntry *entry;
-
- /*
- * Here we check explicitly for 0 return, since we don't want to
- * mangle the activity of an active backend by a delayed packed from a
- * dead one.
- */
- if (pgstat_add_backend(&msg->m_hdr) != 0)
- return;
-
- entry = &(pgStatBeTable[msg->m_hdr.m_backendid - 1]);
-
- strncpy(entry->activity, msg->m_what, PGSTAT_ACTIVITY_SIZE);
-
- entry->activity_start_sec =
- GetCurrentAbsoluteTimeUsec(&entry->activity_start_usec);
+ /* Release memory, if any was allocated */
+ if (pgStatLocalContext)
+ MemoryContextDelete(pgStatLocalContext);
+
+ /* Reset variables */
+ pgStatLocalContext = NULL;
+ pgStatDBHash = NULL;
+ localBackendStatusTable = NULL;
+ localNumBackends = 0;
}
int i;
bool found;
- /*
- * Make sure the backend is counted for.
- */
- if (pgstat_add_backend(&msg->m_hdr) < 0)
- return;
-
- /*
- * Lookup the database in the hashtable.
- */
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &(msg->m_hdr.m_databaseid),
- HASH_FIND, NULL);
- if (!dbentry)
- return;
+ dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
/*
- * If the database is marked for destroy, this is a delayed UDP packet
- * and not worth being counted.
+ * Update database-wide stats.
*/
- if (dbentry->destroy > 0)
- return;
-
dbentry->n_xact_commit += (PgStat_Counter) (msg->m_xact_commit);
dbentry->n_xact_rollback += (PgStat_Counter) (msg->m_xact_rollback);
for (i = 0; i < msg->m_nentries; i++)
{
tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
- (void *) &(tabmsg[i].t_id),
- HASH_ENTER, &found);
- if (tabentry == NULL)
- {
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
- }
+ (void *) &(tabmsg[i].t_id),
+ HASH_ENTER, &found);
if (!found)
{
/*
- * If it's a new table entry, initialize counters to the
- * values we just got.
+ * 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->blocks_fetched = tabmsg[i].t_blocks_fetched;
- tabentry->blocks_hit = tabmsg[i].t_blocks_hit;
-
- tabentry->destroy = 0;
+ tabentry->numscans = tabmsg[i].t_counts.t_numscans;
+ tabentry->tuples_returned = tabmsg[i].t_counts.t_tuples_returned;
+ tabentry->tuples_fetched = tabmsg[i].t_counts.t_tuples_fetched;
+ tabentry->tuples_inserted = tabmsg[i].t_counts.t_tuples_inserted;
+ tabentry->tuples_updated = tabmsg[i].t_counts.t_tuples_updated;
+ tabentry->tuples_deleted = tabmsg[i].t_counts.t_tuples_deleted;
+ tabentry->n_live_tuples = tabmsg[i].t_counts.t_new_live_tuples;
+ tabentry->n_dead_tuples = tabmsg[i].t_counts.t_new_dead_tuples;
+ tabentry->blocks_fetched = tabmsg[i].t_counts.t_blocks_fetched;
+ tabentry->blocks_hit = tabmsg[i].t_counts.t_blocks_hit;
+
+ tabentry->last_anl_tuples = 0;
+ tabentry->vacuum_timestamp = 0;
+ tabentry->autovac_vacuum_timestamp = 0;
+ tabentry->analyze_timestamp = 0;
+ tabentry->autovac_analyze_timestamp = 0;
}
else
{
/*
* Otherwise add the values to the existing entry.
*/
- tabentry->numscans += tabmsg[i].t_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->blocks_fetched += tabmsg[i].t_blocks_fetched;
- tabentry->blocks_hit += tabmsg[i].t_blocks_hit;
+ tabentry->numscans += tabmsg[i].t_counts.t_numscans;
+ tabentry->tuples_returned += tabmsg[i].t_counts.t_tuples_returned;
+ tabentry->tuples_fetched += tabmsg[i].t_counts.t_tuples_fetched;
+ tabentry->tuples_inserted += tabmsg[i].t_counts.t_tuples_inserted;
+ tabentry->tuples_updated += tabmsg[i].t_counts.t_tuples_updated;
+ tabentry->tuples_deleted += tabmsg[i].t_counts.t_tuples_deleted;
+ tabentry->n_live_tuples += tabmsg[i].t_counts.t_new_live_tuples;
+ tabentry->n_dead_tuples += tabmsg[i].t_counts.t_new_dead_tuples;
+ tabentry->blocks_fetched += tabmsg[i].t_counts.t_blocks_fetched;
+ tabentry->blocks_hit += tabmsg[i].t_counts.t_blocks_hit;
}
/*
- * 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[i].t_counts.t_tuples_returned;
+ dbentry->n_tuples_fetched += tabmsg[i].t_counts.t_tuples_fetched;
+ dbentry->n_tuples_inserted += tabmsg[i].t_counts.t_tuples_inserted;
+ dbentry->n_tuples_updated += tabmsg[i].t_counts.t_tuples_updated;
+ dbentry->n_tuples_deleted += tabmsg[i].t_counts.t_tuples_deleted;
+ dbentry->n_blocks_fetched += tabmsg[i].t_counts.t_blocks_fetched;
+ dbentry->n_blocks_hit += tabmsg[i].t_counts.t_blocks_hit;
}
}
pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len)
{
PgStat_StatDBEntry *dbentry;
- PgStat_StatTabEntry *tabentry;
int i;
- /*
- * Make sure the backend is counted for.
- */
- if (pgstat_add_backend(&msg->m_hdr) < 0)
- return;
-
- /*
- * Lookup the database in the hashtable.
- */
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &(msg->m_hdr.m_databaseid),
- HASH_FIND, NULL);
- if (!dbentry)
- return;
+ dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
/*
- * If the database is marked for destroy, this is a delayed UDP packet
- * and the tables will go away at DB destruction.
+ * No need to purge if we don't even know the database.
*/
- if (dbentry->destroy > 0)
+ if (!dbentry || !dbentry->tables)
return;
/*
*/
for (i = 0; i < msg->m_nentries; i++)
{
- tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
- (void *) &(msg->m_tableid[i]),
- HASH_FIND, NULL);
- if (tabentry)
- tabentry->destroy = PGSTAT_DESTROY_COUNT;
+ /* Remove from hashtable if present; we don't care if it's not. */
+ (void) hash_search(dbentry->tables,
+ (void *) &(msg->m_tableid[i]),
+ HASH_REMOVE, NULL);
}
}
{
PgStat_StatDBEntry *dbentry;
- /*
- * Make sure the backend is counted for.
- */
- if (pgstat_add_backend(&msg->m_hdr) < 0)
- return;
-
/*
* Lookup the database in the hashtable.
*/
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &(msg->m_databaseid),
- HASH_FIND, NULL);
- if (!dbentry)
- return;
+ dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
/*
- * Mark the database for destruction.
+ * If found, remove it.
*/
- dbentry->destroy = PGSTAT_DESTROY_COUNT;
+ if (dbentry)
+ {
+ if (dbentry->tables != NULL)
+ hash_destroy(dbentry->tables);
+
+ if (hash_search(pgStatDBHash,
+ (void *) &(dbentry->databaseid),
+ HASH_REMOVE, NULL) == NULL)
+ ereport(ERROR,
+ (errmsg("database hash table corrupted "
+ "during cleanup --- abort")));
+ }
}
/* ----------
- * pgstat_recv_dropdb() -
+ * pgstat_recv_resetcounter() -
*
- * Arrange for dead database removal
+ * Reset the statistics for the specified database.
* ----------
*/
static void
PgStat_StatDBEntry *dbentry;
/*
- * Make sure the backend is counted for.
+ * Lookup the database in the hashtable. Nothing to do if not there.
*/
- if (pgstat_add_backend(&msg->m_hdr) < 0)
- return;
+ dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
- /*
- * Lookup the database in the hashtable.
- */
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &(msg->m_hdr.m_databaseid),
- HASH_FIND, NULL);
if (!dbentry)
return;
/*
- * We simply throw away all the databases table entries by recreating
- * a new hash table for them.
+ * We simply throw away all the database's table entries by recreating a
+ * new hash table for them.
*/
if (dbentry->tables != NULL)
hash_destroy(dbentry->tables);
dbentry->n_xact_rollback = 0;
dbentry->n_blocks_fetched = 0;
dbentry->n_blocks_hit = 0;
- dbentry->n_connects = 0;
- dbentry->destroy = 0;
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
- hash_ctl.hash = tag_hash;
+ hash_ctl.hash = oid_hash;
dbentry->tables = hash_create("Per-database table",
PGSTAT_TAB_HASH_SIZE,
&hash_ctl,
HASH_ELEM | HASH_FUNCTION);
- if (dbentry->tables == NULL)
+}
+
+/* ----------
+ * pgstat_recv_autovac() -
+ *
+ * Process an autovacuum signalling message.
+ * ----------
+ */
+static void
+pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len)
+{
+ PgStat_StatDBEntry *dbentry;
+
+ /*
+ * 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.)
+ */
+ dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
+ if (dbentry == NULL)
+ return;
+
+ /*
+ * Store the last autovacuum time in the database entry.
+ */
+ dbentry->last_autovac_time = msg->m_start_time;
+}
+
+/* ----------
+ * pgstat_recv_vacuum() -
+ *
+ * Process a VACUUM message.
+ * ----------
+ */
+static void
+pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len)
+{
+ PgStat_StatDBEntry *dbentry;
+ PgStat_StatTabEntry *tabentry;
+
+ /*
+ * 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.
+ */
+ dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
+ if (dbentry == NULL)
+ return;
+
+ tabentry = hash_search(dbentry->tables, &(msg->m_tableoid),
+ HASH_FIND, NULL);
+ if (tabentry == NULL)
+ return;
+
+ 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;
+ tabentry->n_dead_tuples = 0;
+ if (msg->m_analyze)
{
- /* assume the problem is out-of-memory */
- ereport(LOG,
- (errcode(ERRCODE_OUT_OF_MEMORY),
- errmsg("out of memory in statistics collector --- abort")));
- exit(1);
+ 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;
}
+ else
+ {
+ /* last_anl_tuples must never exceed n_live_tuples */
+ tabentry->last_anl_tuples = Min(tabentry->last_anl_tuples,
+ msg->m_tuples);
+ }
+}
+
+/* ----------
+ * pgstat_recv_analyze() -
+ *
+ * Process an ANALYZE message.
+ * ----------
+ */
+static void
+pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len)
+{
+ PgStat_StatDBEntry *dbentry;
+ 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.
+ */
+ dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
+ if (dbentry == NULL)
+ return;
+
+ tabentry = hash_search(dbentry->tables, &(msg->m_tableoid),
+ HASH_FIND, NULL);
+ if (tabentry == NULL)
+ return;
+
+ if (msg->m_autovacuum)
+ tabentry->autovac_analyze_timestamp = msg->m_analyzetime;
+ else
+ tabentry->analyze_timestamp = msg->m_analyzetime;
+ tabentry->n_live_tuples = msg->m_live_tuples;
+ tabentry->n_dead_tuples = msg->m_dead_tuples;
+ tabentry->last_anl_tuples = msg->m_live_tuples + msg->m_dead_tuples;
+}
+
+
+/* ----------
+ * pgstat_recv_bgwriter() -
+ *
+ * Process a BGWRITER message.
+ * ----------
+ */
+static void
+pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len)
+{
+ globalStats.timed_checkpoints += msg->m_timed_checkpoints;
+ globalStats.requested_checkpoints += msg->m_requested_checkpoints;
+ globalStats.buf_written_checkpoints += msg->m_buf_written_checkpoints;
+ globalStats.buf_written_lru += msg->m_buf_written_lru;
+ globalStats.buf_written_all += msg->m_buf_written_all;
+ globalStats.maxwritten_lru += msg->m_maxwritten_lru;
+ globalStats.maxwritten_all += msg->m_maxwritten_all;
}
projects / postgresql / blobdiff