4
* All the statistics collector stuff hacked up in one big, ugly file.
6
* TODO: - Separate collector, postmaster and backend stuff
7
* into different files.
9
* - Add some automatic call for pgstat vacuuming.
11
* - Add a pgstat config column to pg_database, so this
12
* entire thing can be enabled/disabled on a per db basis.
14
* Copyright (c) 2001-2011, PostgreSQL Global Development Group
16
* src/backend/postmaster/pgstat.c
23
#include <sys/param.h>
25
#include <sys/socket.h>
27
#include <netinet/in.h>
28
#include <arpa/inet.h>
34
#ifdef HAVE_SYS_POLL_H
40
#include "access/heapam.h"
41
#include "access/transam.h"
42
#include "access/twophase_rmgr.h"
43
#include "access/xact.h"
44
#include "catalog/pg_database.h"
45
#include "catalog/pg_proc.h"
47
#include "libpq/libpq.h"
48
#include "libpq/pqsignal.h"
49
#include "mb/pg_wchar.h"
50
#include "miscadmin.h"
52
#include "postmaster/autovacuum.h"
53
#include "postmaster/fork_process.h"
54
#include "postmaster/postmaster.h"
55
#include "storage/backendid.h"
56
#include "storage/fd.h"
57
#include "storage/ipc.h"
58
#include "storage/pg_shmem.h"
59
#include "storage/pmsignal.h"
60
#include "storage/procsignal.h"
61
#include "utils/guc.h"
62
#include "utils/memutils.h"
63
#include "utils/ps_status.h"
64
#include "utils/rel.h"
65
#include "utils/tqual.h"
69
* Paths for the statistics files (relative to installation's $PGDATA).
72
#define PGSTAT_STAT_PERMANENT_FILENAME "global/pgstat.stat"
73
#define PGSTAT_STAT_PERMANENT_TMPFILE "global/pgstat.tmp"
79
#define PGSTAT_STAT_INTERVAL 500 /* Minimum time between stats file
80
* updates; in milliseconds. */
82
#define PGSTAT_RETRY_DELAY 10 /* How long to wait between statistics
83
* update requests; in milliseconds. */
85
#define PGSTAT_MAX_WAIT_TIME 5000 /* Maximum time to wait for a stats
86
* file update; in milliseconds. */
88
#define PGSTAT_RESTART_INTERVAL 60 /* How often to attempt to restart a
89
* failed statistics collector; in
92
#define PGSTAT_SELECT_TIMEOUT 2 /* How often to check for postmaster
93
* death; in seconds. */
95
#define PGSTAT_POLL_LOOP_COUNT (PGSTAT_MAX_WAIT_TIME / PGSTAT_RETRY_DELAY)
99
* The initial size hints for the hash tables used in the collector.
102
#define PGSTAT_DB_HASH_SIZE 16
103
#define PGSTAT_TAB_HASH_SIZE 512
104
#define PGSTAT_FUNCTION_HASH_SIZE 512
111
bool pgstat_track_activities = false;
112
bool pgstat_track_counts = false;
113
int pgstat_track_functions = TRACK_FUNC_OFF;
114
int pgstat_track_activity_query_size = 1024;
117
* Built from GUC parameter
120
char *pgstat_stat_filename = NULL;
121
char *pgstat_stat_tmpname = NULL;
124
* BgWriter global statistics counters (unused in other processes).
125
* Stored directly in a stats message structure so it can be sent
126
* without needing to copy things around. We assume this inits to zeroes.
128
PgStat_MsgBgWriter BgWriterStats;
134
NON_EXEC_STATIC pgsocket pgStatSock = PGINVALID_SOCKET;
136
static struct sockaddr_storage pgStatAddr;
138
static time_t last_pgstat_start_time;
140
static bool pgStatRunningInCollector = false;
143
* Structures in which backends store per-table info that's waiting to be
144
* sent to the collector.
146
* NOTE: once allocated, TabStatusArray structures are never moved or deleted
147
* for the life of the backend. Also, we zero out the t_id fields of the
148
* contained PgStat_TableStatus structs whenever they are not actively in use.
149
* This allows relcache pgstat_info pointers to be treated as long-lived data,
150
* avoiding repeated searches in pgstat_initstats() when a relation is
151
* repeatedly opened during a transaction.
153
#define TABSTAT_QUANTUM 100 /* we alloc this many at a time */
155
typedef struct TabStatusArray
157
struct TabStatusArray *tsa_next; /* link to next array, if any */
158
int tsa_used; /* # entries currently used */
159
PgStat_TableStatus tsa_entries[TABSTAT_QUANTUM]; /* per-table data */
162
static TabStatusArray *pgStatTabList = NULL;
165
* Backends store per-function info that's waiting to be sent to the collector
166
* in this hash table (indexed by function OID).
168
static HTAB *pgStatFunctions = NULL;
171
* Indicates if backend has some function stats that it hasn't yet
172
* sent to the collector.
174
static bool have_function_stats = false;
177
* Tuple insertion/deletion counts for an open transaction can't be propagated
178
* into PgStat_TableStatus counters until we know if it is going to commit
179
* or abort. Hence, we keep these counts in per-subxact structs that live
180
* in TopTransactionContext. This data structure is designed on the assumption
181
* that subxacts won't usually modify very many tables.
183
typedef struct PgStat_SubXactStatus
185
int nest_level; /* subtransaction nest level */
186
struct PgStat_SubXactStatus *prev; /* higher-level subxact if any */
187
PgStat_TableXactStatus *first; /* head of list for this subxact */
188
} PgStat_SubXactStatus;
190
static PgStat_SubXactStatus *pgStatXactStack = NULL;
192
static int pgStatXactCommit = 0;
193
static int pgStatXactRollback = 0;
195
/* Record that's written to 2PC state file when pgstat state is persisted */
196
typedef struct TwoPhasePgStatRecord
198
PgStat_Counter tuples_inserted; /* tuples inserted in xact */
199
PgStat_Counter tuples_updated; /* tuples updated in xact */
200
PgStat_Counter tuples_deleted; /* tuples deleted in xact */
201
Oid t_id; /* table's OID */
202
bool t_shared; /* is it a shared catalog? */
203
} TwoPhasePgStatRecord;
206
* Info about current "snapshot" of stats file
208
static MemoryContext pgStatLocalContext = NULL;
209
static HTAB *pgStatDBHash = NULL;
210
static PgBackendStatus *localBackendStatusTable = NULL;
211
static int localNumBackends = 0;
214
* Cluster wide statistics, kept in the stats collector.
215
* Contains statistics that are not collected per database
218
static PgStat_GlobalStats globalStats;
220
/* Last time the collector successfully wrote the stats file */
221
static TimestampTz last_statwrite;
223
/* Latest statistics request time from backends */
224
static TimestampTz last_statrequest;
226
static volatile bool need_exit = false;
227
static volatile bool got_SIGHUP = false;
230
* Total time charged to functions so far in the current backend.
231
* We use this to help separate "self" and "other" time charges.
232
* (We assume this initializes to zero.)
234
static instr_time total_func_time;
238
* Local function forward declarations
242
static pid_t pgstat_forkexec(void);
245
NON_EXEC_STATIC void PgstatCollectorMain(int argc, char *argv[]);
246
static void pgstat_exit(SIGNAL_ARGS);
247
static void pgstat_beshutdown_hook(int code, Datum arg);
248
static void pgstat_sighup_handler(SIGNAL_ARGS);
250
static PgStat_StatDBEntry *pgstat_get_db_entry(Oid databaseid, bool create);
251
static PgStat_StatTabEntry *pgstat_get_tab_entry(PgStat_StatDBEntry *dbentry,
252
Oid tableoid, bool create);
253
static void pgstat_write_statsfile(bool permanent);
254
static HTAB *pgstat_read_statsfile(Oid onlydb, bool permanent);
255
static void backend_read_statsfile(void);
256
static void pgstat_read_current_status(void);
258
static void pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg);
259
static void pgstat_send_funcstats(void);
260
static HTAB *pgstat_collect_oids(Oid catalogid);
262
static PgStat_TableStatus *get_tabstat_entry(Oid rel_id, bool isshared);
264
static void pgstat_setup_memcxt(void);
266
static void pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype);
267
static void pgstat_send(void *msg, int len);
269
static void pgstat_recv_inquiry(PgStat_MsgInquiry *msg, int len);
270
static void pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len);
271
static void pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len);
272
static void pgstat_recv_dropdb(PgStat_MsgDropdb *msg, int len);
273
static void pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len);
274
static void pgstat_recv_resetsharedcounter(PgStat_MsgResetsharedcounter *msg, int len);
275
static void pgstat_recv_resetsinglecounter(PgStat_MsgResetsinglecounter *msg, int len);
276
static void pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len);
277
static void pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len);
278
static void pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len);
279
static void pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len);
280
static void pgstat_recv_funcstat(PgStat_MsgFuncstat *msg, int len);
281
static void pgstat_recv_funcpurge(PgStat_MsgFuncpurge *msg, int len);
282
static void pgstat_recv_recoveryconflict(PgStat_MsgRecoveryConflict *msg, int len);
285
/* ------------------------------------------------------------
286
* Public functions called from postmaster follow
287
* ------------------------------------------------------------
293
* Called from postmaster at startup. Create the resources required
294
* by the statistics collector process. If unable to do so, do not
295
* fail --- better to let the postmaster start with stats collection
302
ACCEPT_TYPE_ARG3 alen;
303
struct addrinfo *addrs = NULL,
313
#define TESTBYTEVAL ((char) 199)
316
* Create the UDP socket for sending and receiving statistic messages
318
hints.ai_flags = AI_PASSIVE;
319
hints.ai_family = PF_UNSPEC;
320
hints.ai_socktype = SOCK_DGRAM;
321
hints.ai_protocol = 0;
322
hints.ai_addrlen = 0;
323
hints.ai_addr = NULL;
324
hints.ai_canonname = NULL;
325
hints.ai_next = NULL;
326
ret = pg_getaddrinfo_all("localhost", NULL, &hints, &addrs);
330
(errmsg("could not resolve \"localhost\": %s",
331
gai_strerror(ret))));
336
* On some platforms, pg_getaddrinfo_all() may return multiple addresses
337
* only one of which will actually work (eg, both IPv6 and IPv4 addresses
338
* when kernel will reject IPv6). Worse, the failure may occur at the
339
* bind() or perhaps even connect() stage. So we must loop through the
340
* results till we find a working combination. We will generate LOG
341
* messages, but no error, for bogus combinations.
343
for (addr = addrs; addr; addr = addr->ai_next)
345
#ifdef HAVE_UNIX_SOCKETS
346
/* Ignore AF_UNIX sockets, if any are returned. */
347
if (addr->ai_family == AF_UNIX)
353
(errmsg("trying another address for the statistics collector")));
358
if ((pgStatSock = socket(addr->ai_family, SOCK_DGRAM, 0)) == PGINVALID_SOCKET)
361
(errcode_for_socket_access(),
362
errmsg("could not create socket for statistics collector: %m")));
367
* Bind it to a kernel assigned port on localhost and get the assigned
368
* port via getsockname().
370
if (bind(pgStatSock, addr->ai_addr, addr->ai_addrlen) < 0)
373
(errcode_for_socket_access(),
374
errmsg("could not bind socket for statistics collector: %m")));
375
closesocket(pgStatSock);
376
pgStatSock = PGINVALID_SOCKET;
380
alen = sizeof(pgStatAddr);
381
if (getsockname(pgStatSock, (struct sockaddr *) & pgStatAddr, &alen) < 0)
384
(errcode_for_socket_access(),
385
errmsg("could not get address of socket for statistics collector: %m")));
386
closesocket(pgStatSock);
387
pgStatSock = PGINVALID_SOCKET;
392
* Connect the socket to its own address. This saves a few cycles by
393
* not having to respecify the target address on every send. This also
394
* provides a kernel-level check that only packets from this same
395
* address will be received.
397
if (connect(pgStatSock, (struct sockaddr *) & pgStatAddr, alen) < 0)
400
(errcode_for_socket_access(),
401
errmsg("could not connect socket for statistics collector: %m")));
402
closesocket(pgStatSock);
403
pgStatSock = PGINVALID_SOCKET;
408
* Try to send and receive a one-byte test message on the socket. This
409
* is to catch situations where the socket can be created but will not
410
* actually pass data (for instance, because kernel packet filtering
413
test_byte = TESTBYTEVAL;
416
if (send(pgStatSock, &test_byte, 1, 0) != 1)
419
goto retry1; /* if interrupted, just retry */
421
(errcode_for_socket_access(),
422
errmsg("could not send test message on socket for statistics collector: %m")));
423
closesocket(pgStatSock);
424
pgStatSock = PGINVALID_SOCKET;
429
* There could possibly be a little delay before the message can be
430
* received. We arbitrarily allow up to half a second before deciding
433
for (;;) /* need a loop to handle EINTR */
436
FD_SET(pgStatSock, &rset);
440
sel_res = select(pgStatSock + 1, &rset, NULL, NULL, &tv);
441
if (sel_res >= 0 || errno != EINTR)
447
(errcode_for_socket_access(),
448
errmsg("select() failed in statistics collector: %m")));
449
closesocket(pgStatSock);
450
pgStatSock = PGINVALID_SOCKET;
453
if (sel_res == 0 || !FD_ISSET(pgStatSock, &rset))
456
* This is the case we actually think is likely, so take pains to
457
* give a specific message for it.
459
* errno will not be set meaningfully here, so don't use it.
462
(errcode(ERRCODE_CONNECTION_FAILURE),
463
errmsg("test message did not get through on socket for statistics collector")));
464
closesocket(pgStatSock);
465
pgStatSock = PGINVALID_SOCKET;
469
test_byte++; /* just make sure variable is changed */
472
if (recv(pgStatSock, &test_byte, 1, 0) != 1)
475
goto retry2; /* if interrupted, just retry */
477
(errcode_for_socket_access(),
478
errmsg("could not receive test message on socket for statistics collector: %m")));
479
closesocket(pgStatSock);
480
pgStatSock = PGINVALID_SOCKET;
484
if (test_byte != TESTBYTEVAL) /* strictly paranoia ... */
487
(errcode(ERRCODE_INTERNAL_ERROR),
488
errmsg("incorrect test message transmission on socket for statistics collector")));
489
closesocket(pgStatSock);
490
pgStatSock = PGINVALID_SOCKET;
494
/* If we get here, we have a working socket */
498
/* Did we find a working address? */
499
if (!addr || pgStatSock == PGINVALID_SOCKET)
503
* Set the socket to non-blocking IO. This ensures that if the collector
504
* falls behind, statistics messages will be discarded; backends won't
505
* block waiting to send messages to the collector.
507
if (!pg_set_noblock(pgStatSock))
510
(errcode_for_socket_access(),
511
errmsg("could not set statistics collector socket to nonblocking mode: %m")));
515
pg_freeaddrinfo_all(hints.ai_family, addrs);
521
(errmsg("disabling statistics collector for lack of working socket")));
524
pg_freeaddrinfo_all(hints.ai_family, addrs);
526
if (pgStatSock != PGINVALID_SOCKET)
527
closesocket(pgStatSock);
528
pgStatSock = PGINVALID_SOCKET;
531
* Adjust GUC variables to suppress useless activity, and for debugging
532
* purposes (seeing track_counts off is a clue that we failed here). We
533
* use PGC_S_OVERRIDE because there is no point in trying to turn it back
534
* on from postgresql.conf without a restart.
536
SetConfigOption("track_counts", "off", PGC_INTERNAL, PGC_S_OVERRIDE);
540
* pgstat_reset_all() -
542
* Remove the stats file. This is currently used only if WAL
543
* recovery is needed after a crash.
546
pgstat_reset_all(void)
548
unlink(pgstat_stat_filename);
549
unlink(PGSTAT_STAT_PERMANENT_FILENAME);
555
* pgstat_forkexec() -
557
* Format up the arglist for, then fork and exec, statistics collector process
560
pgstat_forkexec(void)
565
av[ac++] = "postgres";
566
av[ac++] = "--forkcol";
567
av[ac++] = NULL; /* filled in by postmaster_forkexec */
570
Assert(ac < lengthof(av));
572
return postmaster_forkexec(ac, av);
574
#endif /* EXEC_BACKEND */
580
* Called from postmaster at startup or after an existing collector
581
* died. Attempt to fire up a fresh statistics collector.
583
* Returns PID of child process, or 0 if fail.
585
* Note: if fail, we will be called again from the postmaster main loop.
594
* Check that the socket is there, else pgstat_init failed and we can do
597
if (pgStatSock == PGINVALID_SOCKET)
601
* Do nothing if too soon since last collector start. This is a safety
602
* valve to protect against continuous respawn attempts if the collector
603
* is dying immediately at launch. Note that since we will be re-called
604
* from the postmaster main loop, we will get another chance later.
606
curtime = time(NULL);
607
if ((unsigned int) (curtime - last_pgstat_start_time) <
608
(unsigned int) PGSTAT_RESTART_INTERVAL)
610
last_pgstat_start_time = curtime;
613
* Okay, fork off the collector.
616
switch ((pgStatPid = pgstat_forkexec()))
618
switch ((pgStatPid = fork_process()))
623
(errmsg("could not fork statistics collector: %m")));
628
/* in postmaster child ... */
629
/* Close the postmaster's sockets */
630
ClosePostmasterPorts(false);
632
/* Lose the postmaster's on-exit routines */
635
/* Drop our connection to postmaster's shared memory, as well */
636
PGSharedMemoryDetach();
638
PgstatCollectorMain(0, NULL);
643
return (int) pgStatPid;
646
/* shouldn't get here */
651
allow_immediate_pgstat_restart(void)
653
last_pgstat_start_time = 0;
656
/* ------------------------------------------------------------
657
* Public functions used by backends follow
658
*------------------------------------------------------------
663
* pgstat_report_stat() -
665
* Called from tcop/postgres.c to send the so far collected per-table
666
* and function usage statistics to the collector. Note that this is
667
* called only when not within a transaction, so it is fair to use
668
* transaction stop time as an approximation of current time.
672
pgstat_report_stat(bool force)
674
/* we assume this inits to all zeroes: */
675
static const PgStat_TableCounts all_zeroes;
676
static TimestampTz last_report = 0;
679
PgStat_MsgTabstat regular_msg;
680
PgStat_MsgTabstat shared_msg;
684
/* Don't expend a clock check if nothing to do */
685
if ((pgStatTabList == NULL || pgStatTabList->tsa_used == 0)
686
&& !have_function_stats)
690
* Don't send a message unless it's been at least PGSTAT_STAT_INTERVAL
691
* msec since we last sent one, or the caller wants to force stats out.
693
now = GetCurrentTransactionStopTimestamp();
695
!TimestampDifferenceExceeds(last_report, now, PGSTAT_STAT_INTERVAL))
700
* Scan through the TabStatusArray struct(s) to find tables that actually
701
* have counts, and build messages to send. We have to separate shared
702
* relations from regular ones because the databaseid field in the message
703
* header has to depend on that.
705
regular_msg.m_databaseid = MyDatabaseId;
706
shared_msg.m_databaseid = InvalidOid;
707
regular_msg.m_nentries = 0;
708
shared_msg.m_nentries = 0;
710
for (tsa = pgStatTabList; tsa != NULL; tsa = tsa->tsa_next)
712
for (i = 0; i < tsa->tsa_used; i++)
714
PgStat_TableStatus *entry = &tsa->tsa_entries[i];
715
PgStat_MsgTabstat *this_msg;
716
PgStat_TableEntry *this_ent;
718
/* Shouldn't have any pending transaction-dependent counts */
719
Assert(entry->trans == NULL);
722
* Ignore entries that didn't accumulate any actual counts, such
723
* as indexes that were opened by the planner but not used.
725
if (memcmp(&entry->t_counts, &all_zeroes,
726
sizeof(PgStat_TableCounts)) == 0)
730
* OK, insert data into the appropriate message, and send if full.
732
this_msg = entry->t_shared ? &shared_msg : ®ular_msg;
733
this_ent = &this_msg->m_entry[this_msg->m_nentries];
734
this_ent->t_id = entry->t_id;
735
memcpy(&this_ent->t_counts, &entry->t_counts,
736
sizeof(PgStat_TableCounts));
737
if (++this_msg->m_nentries >= PGSTAT_NUM_TABENTRIES)
739
pgstat_send_tabstat(this_msg);
740
this_msg->m_nentries = 0;
743
/* zero out TableStatus structs after use */
744
MemSet(tsa->tsa_entries, 0,
745
tsa->tsa_used * sizeof(PgStat_TableStatus));
750
* Send partial messages. If force is true, make sure that any pending
751
* xact commit/abort gets counted, even if no table stats to send.
753
if (regular_msg.m_nentries > 0 ||
754
(force && (pgStatXactCommit > 0 || pgStatXactRollback > 0)))
755
pgstat_send_tabstat(®ular_msg);
756
if (shared_msg.m_nentries > 0)
757
pgstat_send_tabstat(&shared_msg);
759
/* Now, send function statistics */
760
pgstat_send_funcstats();
764
* Subroutine for pgstat_report_stat: finish and send a tabstat message
767
pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg)
772
/* It's unlikely we'd get here with no socket, but maybe not impossible */
773
if (pgStatSock == PGINVALID_SOCKET)
777
* Report accumulated xact commit/rollback whenever we send a normal
780
if (OidIsValid(tsmsg->m_databaseid))
782
tsmsg->m_xact_commit = pgStatXactCommit;
783
tsmsg->m_xact_rollback = pgStatXactRollback;
784
pgStatXactCommit = 0;
785
pgStatXactRollback = 0;
789
tsmsg->m_xact_commit = 0;
790
tsmsg->m_xact_rollback = 0;
793
n = tsmsg->m_nentries;
794
len = offsetof(PgStat_MsgTabstat, m_entry[0]) +
795
n * sizeof(PgStat_TableEntry);
797
pgstat_setheader(&tsmsg->m_hdr, PGSTAT_MTYPE_TABSTAT);
798
pgstat_send(tsmsg, len);
802
* Subroutine for pgstat_report_stat: populate and send a function stat message
805
pgstat_send_funcstats(void)
807
/* we assume this inits to all zeroes: */
808
static const PgStat_FunctionCounts all_zeroes;
810
PgStat_MsgFuncstat msg;
811
PgStat_BackendFunctionEntry *entry;
812
HASH_SEQ_STATUS fstat;
814
if (pgStatFunctions == NULL)
817
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_FUNCSTAT);
818
msg.m_databaseid = MyDatabaseId;
821
hash_seq_init(&fstat, pgStatFunctions);
822
while ((entry = (PgStat_BackendFunctionEntry *) hash_seq_search(&fstat)) != NULL)
824
PgStat_FunctionEntry *m_ent;
826
/* Skip it if no counts accumulated since last time */
827
if (memcmp(&entry->f_counts, &all_zeroes,
828
sizeof(PgStat_FunctionCounts)) == 0)
831
/* need to convert format of time accumulators */
832
m_ent = &msg.m_entry[msg.m_nentries];
833
m_ent->f_id = entry->f_id;
834
m_ent->f_numcalls = entry->f_counts.f_numcalls;
835
m_ent->f_time = INSTR_TIME_GET_MICROSEC(entry->f_counts.f_time);
836
m_ent->f_time_self = INSTR_TIME_GET_MICROSEC(entry->f_counts.f_time_self);
838
if (++msg.m_nentries >= PGSTAT_NUM_FUNCENTRIES)
840
pgstat_send(&msg, offsetof(PgStat_MsgFuncstat, m_entry[0]) +
841
msg.m_nentries * sizeof(PgStat_FunctionEntry));
845
/* reset the entry's counts */
846
MemSet(&entry->f_counts, 0, sizeof(PgStat_FunctionCounts));
849
if (msg.m_nentries > 0)
850
pgstat_send(&msg, offsetof(PgStat_MsgFuncstat, m_entry[0]) +
851
msg.m_nentries * sizeof(PgStat_FunctionEntry));
853
have_function_stats = false;
858
* pgstat_vacuum_stat() -
860
* Will tell the collector about objects he can get rid of.
864
pgstat_vacuum_stat(void)
867
PgStat_MsgTabpurge msg;
868
PgStat_MsgFuncpurge f_msg;
869
HASH_SEQ_STATUS hstat;
870
PgStat_StatDBEntry *dbentry;
871
PgStat_StatTabEntry *tabentry;
872
PgStat_StatFuncEntry *funcentry;
875
if (pgStatSock == PGINVALID_SOCKET)
879
* If not done for this transaction, read the statistics collector stats
880
* file into some hash tables.
882
backend_read_statsfile();
885
* Read pg_database and make a list of OIDs of all existing databases
887
htab = pgstat_collect_oids(DatabaseRelationId);
890
* Search the database hash table for dead databases and tell the
891
* collector to drop them.
893
hash_seq_init(&hstat, pgStatDBHash);
894
while ((dbentry = (PgStat_StatDBEntry *) hash_seq_search(&hstat)) != NULL)
896
Oid dbid = dbentry->databaseid;
898
CHECK_FOR_INTERRUPTS();
900
/* the DB entry for shared tables (with InvalidOid) is never dropped */
901
if (OidIsValid(dbid) &&
902
hash_search(htab, (void *) &dbid, HASH_FIND, NULL) == NULL)
903
pgstat_drop_database(dbid);
910
* Lookup our own database entry; if not found, nothing more to do.
912
dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
913
(void *) &MyDatabaseId,
915
if (dbentry == NULL || dbentry->tables == NULL)
919
* Similarly to above, make a list of all known relations in this DB.
921
htab = pgstat_collect_oids(RelationRelationId);
924
* Initialize our messages table counter to zero
929
* Check for all tables listed in stats hashtable if they still exist.
931
hash_seq_init(&hstat, dbentry->tables);
932
while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&hstat)) != NULL)
934
Oid tabid = tabentry->tableid;
936
CHECK_FOR_INTERRUPTS();
938
if (hash_search(htab, (void *) &tabid, HASH_FIND, NULL) != NULL)
942
* Not there, so add this table's Oid to the message
944
msg.m_tableid[msg.m_nentries++] = tabid;
947
* If the message is full, send it out and reinitialize to empty
949
if (msg.m_nentries >= PGSTAT_NUM_TABPURGE)
951
len = offsetof(PgStat_MsgTabpurge, m_tableid[0])
952
+msg.m_nentries * sizeof(Oid);
954
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
955
msg.m_databaseid = MyDatabaseId;
956
pgstat_send(&msg, len);
965
if (msg.m_nentries > 0)
967
len = offsetof(PgStat_MsgTabpurge, m_tableid[0])
968
+msg.m_nentries * sizeof(Oid);
970
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
971
msg.m_databaseid = MyDatabaseId;
972
pgstat_send(&msg, len);
979
* Now repeat the above steps for functions. However, we needn't bother
980
* in the common case where no function stats are being collected.
982
if (dbentry->functions != NULL &&
983
hash_get_num_entries(dbentry->functions) > 0)
985
htab = pgstat_collect_oids(ProcedureRelationId);
987
pgstat_setheader(&f_msg.m_hdr, PGSTAT_MTYPE_FUNCPURGE);
988
f_msg.m_databaseid = MyDatabaseId;
989
f_msg.m_nentries = 0;
991
hash_seq_init(&hstat, dbentry->functions);
992
while ((funcentry = (PgStat_StatFuncEntry *) hash_seq_search(&hstat)) != NULL)
994
Oid funcid = funcentry->functionid;
996
CHECK_FOR_INTERRUPTS();
998
if (hash_search(htab, (void *) &funcid, HASH_FIND, NULL) != NULL)
1002
* Not there, so add this function's Oid to the message
1004
f_msg.m_functionid[f_msg.m_nentries++] = funcid;
1007
* If the message is full, send it out and reinitialize to empty
1009
if (f_msg.m_nentries >= PGSTAT_NUM_FUNCPURGE)
1011
len = offsetof(PgStat_MsgFuncpurge, m_functionid[0])
1012
+f_msg.m_nentries * sizeof(Oid);
1014
pgstat_send(&f_msg, len);
1016
f_msg.m_nentries = 0;
1023
if (f_msg.m_nentries > 0)
1025
len = offsetof(PgStat_MsgFuncpurge, m_functionid[0])
1026
+f_msg.m_nentries * sizeof(Oid);
1028
pgstat_send(&f_msg, len);
1037
* pgstat_collect_oids() -
1039
* Collect the OIDs of all objects listed in the specified system catalog
1040
* into a temporary hash table. Caller should hash_destroy the result
1041
* when done with it. (However, we make the table in CurrentMemoryContext
1042
* so that it will be freed properly in event of an error.)
1046
pgstat_collect_oids(Oid catalogid)
1054
memset(&hash_ctl, 0, sizeof(hash_ctl));
1055
hash_ctl.keysize = sizeof(Oid);
1056
hash_ctl.entrysize = sizeof(Oid);
1057
hash_ctl.hash = oid_hash;
1058
hash_ctl.hcxt = CurrentMemoryContext;
1059
htab = hash_create("Temporary table of OIDs",
1060
PGSTAT_TAB_HASH_SIZE,
1062
HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
1064
rel = heap_open(catalogid, AccessShareLock);
1065
scan = heap_beginscan(rel, SnapshotNow, 0, NULL);
1066
while ((tup = heap_getnext(scan, ForwardScanDirection)) != NULL)
1068
Oid thisoid = HeapTupleGetOid(tup);
1070
CHECK_FOR_INTERRUPTS();
1072
(void) hash_search(htab, (void *) &thisoid, HASH_ENTER, NULL);
1075
heap_close(rel, AccessShareLock);
1082
* pgstat_drop_database() -
1084
* Tell the collector that we just dropped a database.
1085
* (If the message gets lost, we will still clean the dead DB eventually
1086
* via future invocations of pgstat_vacuum_stat().)
1090
pgstat_drop_database(Oid databaseid)
1092
PgStat_MsgDropdb msg;
1094
if (pgStatSock == PGINVALID_SOCKET)
1097
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DROPDB);
1098
msg.m_databaseid = databaseid;
1099
pgstat_send(&msg, sizeof(msg));
1104
* pgstat_drop_relation() -
1106
* Tell the collector that we just dropped a relation.
1107
* (If the message gets lost, we will still clean the dead entry eventually
1108
* via future invocations of pgstat_vacuum_stat().)
1110
* Currently not used for lack of any good place to call it; we rely
1111
* entirely on pgstat_vacuum_stat() to clean out stats for dead rels.
1116
pgstat_drop_relation(Oid relid)
1118
PgStat_MsgTabpurge msg;
1121
if (pgStatSock == PGINVALID_SOCKET)
1124
msg.m_tableid[0] = relid;
1127
len = offsetof(PgStat_MsgTabpurge, m_tableid[0]) +sizeof(Oid);
1129
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
1130
msg.m_databaseid = MyDatabaseId;
1131
pgstat_send(&msg, len);
1133
#endif /* NOT_USED */
1137
* pgstat_reset_counters() -
1139
* Tell the statistics collector to reset counters for our database.
1143
pgstat_reset_counters(void)
1145
PgStat_MsgResetcounter msg;
1147
if (pgStatSock == PGINVALID_SOCKET)
1152
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1153
errmsg("must be superuser to reset statistics counters")));
1155
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETCOUNTER);
1156
msg.m_databaseid = MyDatabaseId;
1157
pgstat_send(&msg, sizeof(msg));
1161
* pgstat_reset_shared_counters() -
1163
* Tell the statistics collector to reset cluster-wide shared counters.
1167
pgstat_reset_shared_counters(const char *target)
1169
PgStat_MsgResetsharedcounter msg;
1171
if (pgStatSock == PGINVALID_SOCKET)
1176
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1177
errmsg("must be superuser to reset statistics counters")));
1179
if (strcmp(target, "bgwriter") == 0)
1180
msg.m_resettarget = RESET_BGWRITER;
1183
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1184
errmsg("unrecognized reset target: \"%s\"", target),
1185
errhint("Target must be \"bgwriter\".")));
1187
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETSHAREDCOUNTER);
1188
pgstat_send(&msg, sizeof(msg));
1192
* pgstat_reset_single_counter() -
1194
* Tell the statistics collector to reset a single counter.
1198
pgstat_reset_single_counter(Oid objoid, PgStat_Single_Reset_Type type)
1200
PgStat_MsgResetsinglecounter msg;
1202
if (pgStatSock == PGINVALID_SOCKET)
1207
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1208
errmsg("must be superuser to reset statistics counters")));
1210
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETSINGLECOUNTER);
1211
msg.m_databaseid = MyDatabaseId;
1212
msg.m_resettype = type;
1213
msg.m_objectid = objoid;
1215
pgstat_send(&msg, sizeof(msg));
1219
* pgstat_report_autovac() -
1221
* Called from autovacuum.c to report startup of an autovacuum process.
1222
* We are called before InitPostgres is done, so can't rely on MyDatabaseId;
1223
* the db OID must be passed in, instead.
1227
pgstat_report_autovac(Oid dboid)
1229
PgStat_MsgAutovacStart msg;
1231
if (pgStatSock == PGINVALID_SOCKET)
1234
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_AUTOVAC_START);
1235
msg.m_databaseid = dboid;
1236
msg.m_start_time = GetCurrentTimestamp();
1238
pgstat_send(&msg, sizeof(msg));
1243
* pgstat_report_vacuum() -
1245
* Tell the collector about the table we just vacuumed.
1249
pgstat_report_vacuum(Oid tableoid, bool shared, bool adopt_counts,
1250
PgStat_Counter tuples)
1252
PgStat_MsgVacuum msg;
1254
if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
1257
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_VACUUM);
1258
msg.m_databaseid = shared ? InvalidOid : MyDatabaseId;
1259
msg.m_tableoid = tableoid;
1260
msg.m_adopt_counts = adopt_counts;
1261
msg.m_autovacuum = IsAutoVacuumWorkerProcess();
1262
msg.m_vacuumtime = GetCurrentTimestamp();
1263
msg.m_tuples = tuples;
1264
pgstat_send(&msg, sizeof(msg));
1268
* pgstat_report_analyze() -
1270
* Tell the collector about the table we just analyzed.
1274
pgstat_report_analyze(Relation rel, bool adopt_counts,
1275
PgStat_Counter livetuples, PgStat_Counter deadtuples)
1277
PgStat_MsgAnalyze msg;
1279
if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
1283
* Unlike VACUUM, ANALYZE might be running inside a transaction that has
1284
* already inserted and/or deleted rows in the target table. ANALYZE will
1285
* have counted such rows as live or dead respectively. Because we will
1286
* report our counts of such rows at transaction end, we should subtract
1287
* off these counts from what we send to the collector now, else they'll
1288
* be double-counted after commit. (This approach also ensures that the
1289
* collector ends up with the right numbers if we abort instead of
1292
if (rel->pgstat_info != NULL)
1294
PgStat_TableXactStatus *trans;
1296
for (trans = rel->pgstat_info->trans; trans; trans = trans->upper)
1298
livetuples -= trans->tuples_inserted - trans->tuples_deleted;
1299
deadtuples -= trans->tuples_updated + trans->tuples_deleted;
1301
/* count stuff inserted by already-aborted subxacts, too */
1302
deadtuples -= rel->pgstat_info->t_counts.t_delta_dead_tuples;
1303
/* Since ANALYZE's counts are estimates, we could have underflowed */
1304
livetuples = Max(livetuples, 0);
1305
deadtuples = Max(deadtuples, 0);
1308
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_ANALYZE);
1309
msg.m_databaseid = rel->rd_rel->relisshared ? InvalidOid : MyDatabaseId;
1310
msg.m_tableoid = RelationGetRelid(rel);
1311
msg.m_adopt_counts = adopt_counts;
1312
msg.m_autovacuum = IsAutoVacuumWorkerProcess();
1313
msg.m_analyzetime = GetCurrentTimestamp();
1314
msg.m_live_tuples = livetuples;
1315
msg.m_dead_tuples = deadtuples;
1316
pgstat_send(&msg, sizeof(msg));
1320
* pgstat_report_recovery_conflict() -
1322
* Tell the collector about a Hot Standby recovery conflict.
1326
pgstat_report_recovery_conflict(int reason)
1328
PgStat_MsgRecoveryConflict msg;
1330
if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
1333
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RECOVERYCONFLICT);
1334
msg.m_databaseid = MyDatabaseId;
1335
msg.m_reason = reason;
1336
pgstat_send(&msg, sizeof(msg));
1342
* Send some junk data to the collector to increase traffic.
1348
PgStat_MsgDummy msg;
1350
if (pgStatSock == PGINVALID_SOCKET)
1353
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DUMMY);
1354
pgstat_send(&msg, sizeof(msg));
1358
* pgstat_send_inquiry() -
1360
* Notify collector that we need fresh data.
1361
* ts specifies the minimum acceptable timestamp for the stats file.
1365
pgstat_send_inquiry(TimestampTz ts)
1367
PgStat_MsgInquiry msg;
1369
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_INQUIRY);
1370
msg.inquiry_time = ts;
1371
pgstat_send(&msg, sizeof(msg));
1376
* Initialize function call usage data.
1377
* Called by the executor before invoking a function.
1380
pgstat_init_function_usage(FunctionCallInfoData *fcinfo,
1381
PgStat_FunctionCallUsage *fcu)
1383
PgStat_BackendFunctionEntry *htabent;
1386
if (pgstat_track_functions <= fcinfo->flinfo->fn_stats)
1388
/* stats not wanted */
1393
if (!pgStatFunctions)
1395
/* First time through - initialize function stat table */
1398
memset(&hash_ctl, 0, sizeof(hash_ctl));
1399
hash_ctl.keysize = sizeof(Oid);
1400
hash_ctl.entrysize = sizeof(PgStat_BackendFunctionEntry);
1401
hash_ctl.hash = oid_hash;
1402
pgStatFunctions = hash_create("Function stat entries",
1403
PGSTAT_FUNCTION_HASH_SIZE,
1405
HASH_ELEM | HASH_FUNCTION);
1408
/* Get the stats entry for this function, create if necessary */
1409
htabent = hash_search(pgStatFunctions, &fcinfo->flinfo->fn_oid,
1410
HASH_ENTER, &found);
1412
MemSet(&htabent->f_counts, 0, sizeof(PgStat_FunctionCounts));
1414
fcu->fs = &htabent->f_counts;
1416
/* save stats for this function, later used to compensate for recursion */
1417
fcu->save_f_time = htabent->f_counts.f_time;
1419
/* save current backend-wide total time */
1420
fcu->save_total = total_func_time;
1422
/* get clock time as of function start */
1423
INSTR_TIME_SET_CURRENT(fcu->f_start);
1427
* find_funcstat_entry - find any existing PgStat_BackendFunctionEntry entry
1428
* for specified function
1430
* If no entry, return NULL, don't create a new one
1432
PgStat_BackendFunctionEntry *
1433
find_funcstat_entry(Oid func_id)
1435
if (pgStatFunctions == NULL)
1438
return (PgStat_BackendFunctionEntry *) hash_search(pgStatFunctions,
1444
* Calculate function call usage and update stat counters.
1445
* Called by the executor after invoking a function.
1447
* In the case of a set-returning function that runs in value-per-call mode,
1448
* we will see multiple pgstat_init_function_usage/pgstat_end_function_usage
1449
* calls for what the user considers a single call of the function. The
1450
* finalize flag should be TRUE on the last call.
1453
pgstat_end_function_usage(PgStat_FunctionCallUsage *fcu, bool finalize)
1455
PgStat_FunctionCounts *fs = fcu->fs;
1457
instr_time f_others;
1460
/* stats not wanted? */
1464
/* total elapsed time in this function call */
1465
INSTR_TIME_SET_CURRENT(f_total);
1466
INSTR_TIME_SUBTRACT(f_total, fcu->f_start);
1468
/* self usage: elapsed minus anything already charged to other calls */
1469
f_others = total_func_time;
1470
INSTR_TIME_SUBTRACT(f_others, fcu->save_total);
1472
INSTR_TIME_SUBTRACT(f_self, f_others);
1474
/* update backend-wide total time */
1475
INSTR_TIME_ADD(total_func_time, f_self);
1478
* Compute the new total f_time as the total elapsed time added to the
1479
* pre-call value of f_time. This is necessary to avoid double-counting
1480
* any time taken by recursive calls of myself. (We do not need any
1481
* similar kluge for self time, since that already excludes any recursive
1484
INSTR_TIME_ADD(f_total, fcu->save_f_time);
1486
/* update counters in function stats table */
1489
fs->f_time = f_total;
1490
INSTR_TIME_ADD(fs->f_time_self, f_self);
1492
/* indicate that we have something to send */
1493
have_function_stats = true;
1498
* pgstat_initstats() -
1500
* Initialize a relcache entry to count access statistics.
1501
* Called whenever a relation is opened.
1503
* We assume that a relcache entry's pgstat_info field is zeroed by
1504
* relcache.c when the relcache entry is made; thereafter it is long-lived
1505
* data. We can avoid repeated searches of the TabStatus arrays when the
1506
* same relation is touched repeatedly within a transaction.
1510
pgstat_initstats(Relation rel)
1512
Oid rel_id = rel->rd_id;
1513
char relkind = rel->rd_rel->relkind;
1515
/* We only count stats for things that have storage */
1516
if (!(relkind == RELKIND_RELATION ||
1517
relkind == RELKIND_INDEX ||
1518
relkind == RELKIND_TOASTVALUE ||
1519
relkind == RELKIND_SEQUENCE))
1521
rel->pgstat_info = NULL;
1525
if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
1527
/* We're not counting at all */
1528
rel->pgstat_info = NULL;
1533
* If we already set up this relation in the current transaction, nothing
1536
if (rel->pgstat_info != NULL &&
1537
rel->pgstat_info->t_id == rel_id)
1540
/* Else find or make the PgStat_TableStatus entry, and update link */
1541
rel->pgstat_info = get_tabstat_entry(rel_id, rel->rd_rel->relisshared);
1545
* get_tabstat_entry - find or create a PgStat_TableStatus entry for rel
1547
static PgStat_TableStatus *
1548
get_tabstat_entry(Oid rel_id, bool isshared)
1550
PgStat_TableStatus *entry;
1551
TabStatusArray *tsa;
1552
TabStatusArray *prev_tsa;
1556
* Search the already-used tabstat slots for this relation.
1559
for (tsa = pgStatTabList; tsa != NULL; prev_tsa = tsa, tsa = tsa->tsa_next)
1561
for (i = 0; i < tsa->tsa_used; i++)
1563
entry = &tsa->tsa_entries[i];
1564
if (entry->t_id == rel_id)
1568
if (tsa->tsa_used < TABSTAT_QUANTUM)
1571
* It must not be present, but we found a free slot instead. Fine,
1572
* let's use this one. We assume the entry was already zeroed,
1573
* either at creation or after last use.
1575
entry = &tsa->tsa_entries[tsa->tsa_used++];
1576
entry->t_id = rel_id;
1577
entry->t_shared = isshared;
1583
* We ran out of tabstat slots, so allocate more. Be sure they're zeroed.
1585
tsa = (TabStatusArray *) MemoryContextAllocZero(TopMemoryContext,
1586
sizeof(TabStatusArray));
1588
prev_tsa->tsa_next = tsa;
1590
pgStatTabList = tsa;
1593
* Use the first entry of the new TabStatusArray.
1595
entry = &tsa->tsa_entries[tsa->tsa_used++];
1596
entry->t_id = rel_id;
1597
entry->t_shared = isshared;
1602
* find_tabstat_entry - find any existing PgStat_TableStatus entry for rel
1604
* If no entry, return NULL, don't create a new one
1606
PgStat_TableStatus *
1607
find_tabstat_entry(Oid rel_id)
1609
PgStat_TableStatus *entry;
1610
TabStatusArray *tsa;
1613
for (tsa = pgStatTabList; tsa != NULL; tsa = tsa->tsa_next)
1615
for (i = 0; i < tsa->tsa_used; i++)
1617
entry = &tsa->tsa_entries[i];
1618
if (entry->t_id == rel_id)
1628
* get_tabstat_stack_level - add a new (sub)transaction stack entry if needed
1630
static PgStat_SubXactStatus *
1631
get_tabstat_stack_level(int nest_level)
1633
PgStat_SubXactStatus *xact_state;
1635
xact_state = pgStatXactStack;
1636
if (xact_state == NULL || xact_state->nest_level != nest_level)
1638
xact_state = (PgStat_SubXactStatus *)
1639
MemoryContextAlloc(TopTransactionContext,
1640
sizeof(PgStat_SubXactStatus));
1641
xact_state->nest_level = nest_level;
1642
xact_state->prev = pgStatXactStack;
1643
xact_state->first = NULL;
1644
pgStatXactStack = xact_state;
1650
* add_tabstat_xact_level - add a new (sub)transaction state record
1653
add_tabstat_xact_level(PgStat_TableStatus *pgstat_info, int nest_level)
1655
PgStat_SubXactStatus *xact_state;
1656
PgStat_TableXactStatus *trans;
1659
* If this is the first rel to be modified at the current nest level, we
1660
* first have to push a transaction stack entry.
1662
xact_state = get_tabstat_stack_level(nest_level);
1664
/* Now make a per-table stack entry */
1665
trans = (PgStat_TableXactStatus *)
1666
MemoryContextAllocZero(TopTransactionContext,
1667
sizeof(PgStat_TableXactStatus));
1668
trans->nest_level = nest_level;
1669
trans->upper = pgstat_info->trans;
1670
trans->parent = pgstat_info;
1671
trans->next = xact_state->first;
1672
xact_state->first = trans;
1673
pgstat_info->trans = trans;
1677
* pgstat_count_heap_insert - count a tuple insertion
1680
pgstat_count_heap_insert(Relation rel)
1682
PgStat_TableStatus *pgstat_info = rel->pgstat_info;
1684
if (pgstat_info != NULL)
1686
/* We have to log the effect at the proper transactional level */
1687
int nest_level = GetCurrentTransactionNestLevel();
1689
if (pgstat_info->trans == NULL ||
1690
pgstat_info->trans->nest_level != nest_level)
1691
add_tabstat_xact_level(pgstat_info, nest_level);
1693
pgstat_info->trans->tuples_inserted++;
1698
* pgstat_count_heap_update - count a tuple update
1701
pgstat_count_heap_update(Relation rel, bool hot)
1703
PgStat_TableStatus *pgstat_info = rel->pgstat_info;
1705
if (pgstat_info != NULL)
1707
/* We have to log the effect at the proper transactional level */
1708
int nest_level = GetCurrentTransactionNestLevel();
1710
if (pgstat_info->trans == NULL ||
1711
pgstat_info->trans->nest_level != nest_level)
1712
add_tabstat_xact_level(pgstat_info, nest_level);
1714
pgstat_info->trans->tuples_updated++;
1716
/* t_tuples_hot_updated is nontransactional, so just advance it */
1718
pgstat_info->t_counts.t_tuples_hot_updated++;
1723
* pgstat_count_heap_delete - count a tuple deletion
1726
pgstat_count_heap_delete(Relation rel)
1728
PgStat_TableStatus *pgstat_info = rel->pgstat_info;
1730
if (pgstat_info != NULL)
1732
/* We have to log the effect at the proper transactional level */
1733
int nest_level = GetCurrentTransactionNestLevel();
1735
if (pgstat_info->trans == NULL ||
1736
pgstat_info->trans->nest_level != nest_level)
1737
add_tabstat_xact_level(pgstat_info, nest_level);
1739
pgstat_info->trans->tuples_deleted++;
1744
* pgstat_update_heap_dead_tuples - update dead-tuples count
1746
* The semantics of this are that we are reporting the nontransactional
1747
* recovery of "delta" dead tuples; so t_delta_dead_tuples decreases
1748
* rather than increasing, and the change goes straight into the per-table
1749
* counter, not into transactional state.
1752
pgstat_update_heap_dead_tuples(Relation rel, int delta)
1754
PgStat_TableStatus *pgstat_info = rel->pgstat_info;
1756
if (pgstat_info != NULL)
1757
pgstat_info->t_counts.t_delta_dead_tuples -= delta;
1764
* Called from access/transam/xact.c at top-level transaction commit/abort.
1768
AtEOXact_PgStat(bool isCommit)
1770
PgStat_SubXactStatus *xact_state;
1773
* Count transaction commit or abort. (We use counters, not just bools,
1774
* in case the reporting message isn't sent right away.)
1779
pgStatXactRollback++;
1782
* Transfer transactional insert/update counts into the base tabstat
1783
* entries. We don't bother to free any of the transactional state, since
1784
* it's all in TopTransactionContext and will go away anyway.
1786
xact_state = pgStatXactStack;
1787
if (xact_state != NULL)
1789
PgStat_TableXactStatus *trans;
1791
Assert(xact_state->nest_level == 1);
1792
Assert(xact_state->prev == NULL);
1793
for (trans = xact_state->first; trans != NULL; trans = trans->next)
1795
PgStat_TableStatus *tabstat;
1797
Assert(trans->nest_level == 1);
1798
Assert(trans->upper == NULL);
1799
tabstat = trans->parent;
1800
Assert(tabstat->trans == trans);
1801
/* count attempted actions regardless of commit/abort */
1802
tabstat->t_counts.t_tuples_inserted += trans->tuples_inserted;
1803
tabstat->t_counts.t_tuples_updated += trans->tuples_updated;
1804
tabstat->t_counts.t_tuples_deleted += trans->tuples_deleted;
1807
/* insert adds a live tuple, delete removes one */
1808
tabstat->t_counts.t_delta_live_tuples +=
1809
trans->tuples_inserted - trans->tuples_deleted;
1810
/* update and delete each create a dead tuple */
1811
tabstat->t_counts.t_delta_dead_tuples +=
1812
trans->tuples_updated + trans->tuples_deleted;
1813
/* insert, update, delete each count as one change event */
1814
tabstat->t_counts.t_changed_tuples +=
1815
trans->tuples_inserted + trans->tuples_updated +
1816
trans->tuples_deleted;
1820
/* inserted tuples are dead, deleted tuples are unaffected */
1821
tabstat->t_counts.t_delta_dead_tuples +=
1822
trans->tuples_inserted + trans->tuples_updated;
1823
/* an aborted xact generates no changed_tuple events */
1825
tabstat->trans = NULL;
1828
pgStatXactStack = NULL;
1830
/* Make sure any stats snapshot is thrown away */
1831
pgstat_clear_snapshot();
1835
* AtEOSubXact_PgStat
1837
* Called from access/transam/xact.c at subtransaction commit/abort.
1841
AtEOSubXact_PgStat(bool isCommit, int nestDepth)
1843
PgStat_SubXactStatus *xact_state;
1846
* Transfer transactional insert/update counts into the next higher
1847
* subtransaction state.
1849
xact_state = pgStatXactStack;
1850
if (xact_state != NULL &&
1851
xact_state->nest_level >= nestDepth)
1853
PgStat_TableXactStatus *trans;
1854
PgStat_TableXactStatus *next_trans;
1856
/* delink xact_state from stack immediately to simplify reuse case */
1857
pgStatXactStack = xact_state->prev;
1859
for (trans = xact_state->first; trans != NULL; trans = next_trans)
1861
PgStat_TableStatus *tabstat;
1863
next_trans = trans->next;
1864
Assert(trans->nest_level == nestDepth);
1865
tabstat = trans->parent;
1866
Assert(tabstat->trans == trans);
1869
if (trans->upper && trans->upper->nest_level == nestDepth - 1)
1871
trans->upper->tuples_inserted += trans->tuples_inserted;
1872
trans->upper->tuples_updated += trans->tuples_updated;
1873
trans->upper->tuples_deleted += trans->tuples_deleted;
1874
tabstat->trans = trans->upper;
1880
* When there isn't an immediate parent state, we can just
1881
* reuse the record instead of going through a
1882
* palloc/pfree pushup (this works since it's all in
1883
* TopTransactionContext anyway). We have to re-link it
1884
* into the parent level, though, and that might mean
1885
* pushing a new entry into the pgStatXactStack.
1887
PgStat_SubXactStatus *upper_xact_state;
1889
upper_xact_state = get_tabstat_stack_level(nestDepth - 1);
1890
trans->next = upper_xact_state->first;
1891
upper_xact_state->first = trans;
1892
trans->nest_level = nestDepth - 1;
1898
* On abort, update top-level tabstat counts, then forget the
1902
/* count attempted actions regardless of commit/abort */
1903
tabstat->t_counts.t_tuples_inserted += trans->tuples_inserted;
1904
tabstat->t_counts.t_tuples_updated += trans->tuples_updated;
1905
tabstat->t_counts.t_tuples_deleted += trans->tuples_deleted;
1906
/* inserted tuples are dead, deleted tuples are unaffected */
1907
tabstat->t_counts.t_delta_dead_tuples +=
1908
trans->tuples_inserted + trans->tuples_updated;
1909
tabstat->trans = trans->upper;
1920
* Save the transactional stats state at 2PC transaction prepare.
1922
* In this phase we just generate 2PC records for all the pending
1923
* transaction-dependent stats work.
1926
AtPrepare_PgStat(void)
1928
PgStat_SubXactStatus *xact_state;
1930
xact_state = pgStatXactStack;
1931
if (xact_state != NULL)
1933
PgStat_TableXactStatus *trans;
1935
Assert(xact_state->nest_level == 1);
1936
Assert(xact_state->prev == NULL);
1937
for (trans = xact_state->first; trans != NULL; trans = trans->next)
1939
PgStat_TableStatus *tabstat;
1940
TwoPhasePgStatRecord record;
1942
Assert(trans->nest_level == 1);
1943
Assert(trans->upper == NULL);
1944
tabstat = trans->parent;
1945
Assert(tabstat->trans == trans);
1947
record.tuples_inserted = trans->tuples_inserted;
1948
record.tuples_updated = trans->tuples_updated;
1949
record.tuples_deleted = trans->tuples_deleted;
1950
record.t_id = tabstat->t_id;
1951
record.t_shared = tabstat->t_shared;
1953
RegisterTwoPhaseRecord(TWOPHASE_RM_PGSTAT_ID, 0,
1954
&record, sizeof(TwoPhasePgStatRecord));
1960
* PostPrepare_PgStat
1961
* Clean up after successful PREPARE.
1963
* All we need do here is unlink the transaction stats state from the
1964
* nontransactional state. The nontransactional action counts will be
1965
* reported to the stats collector immediately, while the effects on live
1966
* and dead tuple counts are preserved in the 2PC state file.
1968
* Note: AtEOXact_PgStat is not called during PREPARE.
1971
PostPrepare_PgStat(void)
1973
PgStat_SubXactStatus *xact_state;
1976
* We don't bother to free any of the transactional state, since it's all
1977
* in TopTransactionContext and will go away anyway.
1979
xact_state = pgStatXactStack;
1980
if (xact_state != NULL)
1982
PgStat_TableXactStatus *trans;
1984
for (trans = xact_state->first; trans != NULL; trans = trans->next)
1986
PgStat_TableStatus *tabstat;
1988
tabstat = trans->parent;
1989
tabstat->trans = NULL;
1992
pgStatXactStack = NULL;
1994
/* Make sure any stats snapshot is thrown away */
1995
pgstat_clear_snapshot();
1999
* 2PC processing routine for COMMIT PREPARED case.
2001
* Load the saved counts into our local pgstats state.
2004
pgstat_twophase_postcommit(TransactionId xid, uint16 info,
2005
void *recdata, uint32 len)
2007
TwoPhasePgStatRecord *rec = (TwoPhasePgStatRecord *) recdata;
2008
PgStat_TableStatus *pgstat_info;
2010
/* Find or create a tabstat entry for the rel */
2011
pgstat_info = get_tabstat_entry(rec->t_id, rec->t_shared);
2013
/* Same math as in AtEOXact_PgStat, commit case */
2014
pgstat_info->t_counts.t_tuples_inserted += rec->tuples_inserted;
2015
pgstat_info->t_counts.t_tuples_updated += rec->tuples_updated;
2016
pgstat_info->t_counts.t_tuples_deleted += rec->tuples_deleted;
2017
pgstat_info->t_counts.t_delta_live_tuples +=
2018
rec->tuples_inserted - rec->tuples_deleted;
2019
pgstat_info->t_counts.t_delta_dead_tuples +=
2020
rec->tuples_updated + rec->tuples_deleted;
2021
pgstat_info->t_counts.t_changed_tuples +=
2022
rec->tuples_inserted + rec->tuples_updated +
2023
rec->tuples_deleted;
2027
* 2PC processing routine for ROLLBACK PREPARED case.
2029
* Load the saved counts into our local pgstats state, but treat them
2033
pgstat_twophase_postabort(TransactionId xid, uint16 info,
2034
void *recdata, uint32 len)
2036
TwoPhasePgStatRecord *rec = (TwoPhasePgStatRecord *) recdata;
2037
PgStat_TableStatus *pgstat_info;
2039
/* Find or create a tabstat entry for the rel */
2040
pgstat_info = get_tabstat_entry(rec->t_id, rec->t_shared);
2042
/* Same math as in AtEOXact_PgStat, abort case */
2043
pgstat_info->t_counts.t_tuples_inserted += rec->tuples_inserted;
2044
pgstat_info->t_counts.t_tuples_updated += rec->tuples_updated;
2045
pgstat_info->t_counts.t_tuples_deleted += rec->tuples_deleted;
2046
pgstat_info->t_counts.t_delta_dead_tuples +=
2047
rec->tuples_inserted + rec->tuples_updated;
2052
* pgstat_fetch_stat_dbentry() -
2054
* Support function for the SQL-callable pgstat* functions. Returns
2055
* the collected statistics for one database or NULL. NULL doesn't mean
2056
* that the database doesn't exist, it is just not yet known by the
2057
* collector, so the caller is better off to report ZERO instead.
2060
PgStat_StatDBEntry *
2061
pgstat_fetch_stat_dbentry(Oid dbid)
2064
* If not done for this transaction, read the statistics collector stats
2065
* file into some hash tables.
2067
backend_read_statsfile();
2070
* Lookup the requested database; return NULL if not found
2072
return (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
2079
* pgstat_fetch_stat_tabentry() -
2081
* Support function for the SQL-callable pgstat* functions. Returns
2082
* the collected statistics for one table or NULL. NULL doesn't mean
2083
* that the table doesn't exist, it is just not yet known by the
2084
* collector, so the caller is better off to report ZERO instead.
2087
PgStat_StatTabEntry *
2088
pgstat_fetch_stat_tabentry(Oid relid)
2091
PgStat_StatDBEntry *dbentry;
2092
PgStat_StatTabEntry *tabentry;
2095
* If not done for this transaction, read the statistics collector stats
2096
* file into some hash tables.
2098
backend_read_statsfile();
2101
* Lookup our database, then look in its table hash table.
2103
dbid = MyDatabaseId;
2104
dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
2107
if (dbentry != NULL && dbentry->tables != NULL)
2109
tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
2117
* If we didn't find it, maybe it's a shared table.
2120
dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
2123
if (dbentry != NULL && dbentry->tables != NULL)
2125
tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
2137
* pgstat_fetch_stat_funcentry() -
2139
* Support function for the SQL-callable pgstat* functions. Returns
2140
* the collected statistics for one function or NULL.
2143
PgStat_StatFuncEntry *
2144
pgstat_fetch_stat_funcentry(Oid func_id)
2146
PgStat_StatDBEntry *dbentry;
2147
PgStat_StatFuncEntry *funcentry = NULL;
2149
/* load the stats file if needed */
2150
backend_read_statsfile();
2152
/* Lookup our database, then find the requested function. */
2153
dbentry = pgstat_fetch_stat_dbentry(MyDatabaseId);
2154
if (dbentry != NULL && dbentry->functions != NULL)
2156
funcentry = (PgStat_StatFuncEntry *) hash_search(dbentry->functions,
2166
* pgstat_fetch_stat_beentry() -
2168
* Support function for the SQL-callable pgstat* functions. Returns
2169
* our local copy of the current-activity entry for one backend.
2171
* NB: caller is responsible for a check if the user is permitted to see
2172
* this info (especially the querystring).
2176
pgstat_fetch_stat_beentry(int beid)
2178
pgstat_read_current_status();
2180
if (beid < 1 || beid > localNumBackends)
2183
return &localBackendStatusTable[beid - 1];
2188
* pgstat_fetch_stat_numbackends() -
2190
* Support function for the SQL-callable pgstat* functions. Returns
2191
* the maximum current backend id.
2195
pgstat_fetch_stat_numbackends(void)
2197
pgstat_read_current_status();
2199
return localNumBackends;
2204
* pgstat_fetch_global() -
2206
* Support function for the SQL-callable pgstat* functions. Returns
2207
* a pointer to the global statistics struct.
2210
PgStat_GlobalStats *
2211
pgstat_fetch_global(void)
2213
backend_read_statsfile();
2215
return &globalStats;
2219
/* ------------------------------------------------------------
2220
* Functions for management of the shared-memory PgBackendStatus array
2221
* ------------------------------------------------------------
2224
static PgBackendStatus *BackendStatusArray = NULL;
2225
static PgBackendStatus *MyBEEntry = NULL;
2226
static char *BackendClientHostnameBuffer = NULL;
2227
static char *BackendAppnameBuffer = NULL;
2228
static char *BackendActivityBuffer = NULL;
2232
* Report shared-memory space needed by CreateSharedBackendStatus.
2235
BackendStatusShmemSize(void)
2239
size = mul_size(sizeof(PgBackendStatus), MaxBackends);
2240
size = add_size(size,
2241
mul_size(NAMEDATALEN, MaxBackends));
2242
size = add_size(size,
2243
mul_size(pgstat_track_activity_query_size, MaxBackends));
2244
size = add_size(size,
2245
mul_size(NAMEDATALEN, MaxBackends));
2250
* Initialize the shared status array and several string buffers
2251
* during postmaster startup.
2254
CreateSharedBackendStatus(void)
2261
/* Create or attach to the shared array */
2262
size = mul_size(sizeof(PgBackendStatus), MaxBackends);
2263
BackendStatusArray = (PgBackendStatus *)
2264
ShmemInitStruct("Backend Status Array", size, &found);
2269
* We're the first - initialize.
2271
MemSet(BackendStatusArray, 0, size);
2274
/* Create or attach to the shared appname buffer */
2275
size = mul_size(NAMEDATALEN, MaxBackends);
2276
BackendAppnameBuffer = (char *)
2277
ShmemInitStruct("Backend Application Name Buffer", size, &found);
2281
MemSet(BackendAppnameBuffer, 0, size);
2283
/* Initialize st_appname pointers. */
2284
buffer = BackendAppnameBuffer;
2285
for (i = 0; i < MaxBackends; i++)
2287
BackendStatusArray[i].st_appname = buffer;
2288
buffer += NAMEDATALEN;
2292
/* Create or attach to the shared client hostname buffer */
2293
size = mul_size(NAMEDATALEN, MaxBackends);
2294
BackendClientHostnameBuffer = (char *)
2295
ShmemInitStruct("Backend Client Host Name Buffer", size, &found);
2299
MemSet(BackendClientHostnameBuffer, 0, size);
2301
/* Initialize st_clienthostname pointers. */
2302
buffer = BackendClientHostnameBuffer;
2303
for (i = 0; i < MaxBackends; i++)
2305
BackendStatusArray[i].st_clienthostname = buffer;
2306
buffer += NAMEDATALEN;
2310
/* Create or attach to the shared activity buffer */
2311
size = mul_size(pgstat_track_activity_query_size, MaxBackends);
2312
BackendActivityBuffer = (char *)
2313
ShmemInitStruct("Backend Activity Buffer", size, &found);
2317
MemSet(BackendActivityBuffer, 0, size);
2319
/* Initialize st_activity pointers. */
2320
buffer = BackendActivityBuffer;
2321
for (i = 0; i < MaxBackends; i++)
2323
BackendStatusArray[i].st_activity = buffer;
2324
buffer += pgstat_track_activity_query_size;
2331
* pgstat_initialize() -
2333
* Initialize pgstats state, and set up our on-proc-exit hook.
2334
* Called from InitPostgres. MyBackendId must be set,
2335
* but we must not have started any transaction yet (since the
2336
* exit hook must run after the last transaction exit).
2337
* NOTE: MyDatabaseId isn't set yet; so the shutdown hook has to be careful.
2341
pgstat_initialize(void)
2343
/* Initialize MyBEEntry */
2344
Assert(MyBackendId >= 1 && MyBackendId <= MaxBackends);
2345
MyBEEntry = &BackendStatusArray[MyBackendId - 1];
2347
/* Set up a process-exit hook to clean up */
2348
on_shmem_exit(pgstat_beshutdown_hook, 0);
2352
* pgstat_bestart() -
2354
* Initialize this backend's entry in the PgBackendStatus array.
2355
* Called from InitPostgres.
2356
* MyDatabaseId, session userid, and application_name must be set
2357
* (hence, this cannot be combined with pgstat_initialize).
2361
pgstat_bestart(void)
2363
TimestampTz proc_start_timestamp;
2365
SockAddr clientaddr;
2366
volatile PgBackendStatus *beentry;
2369
* To minimize the time spent modifying the PgBackendStatus entry, fetch
2370
* all the needed data first.
2372
* If we have a MyProcPort, use its session start time (for consistency,
2373
* and to save a kernel call).
2376
proc_start_timestamp = MyProcPort->SessionStartTime;
2378
proc_start_timestamp = GetCurrentTimestamp();
2379
userid = GetSessionUserId();
2382
* We may not have a MyProcPort (eg, if this is the autovacuum process).
2383
* If so, use all-zeroes client address, which is dealt with specially in
2384
* pg_stat_get_backend_client_addr and pg_stat_get_backend_client_port.
2387
memcpy(&clientaddr, &MyProcPort->raddr, sizeof(clientaddr));
2389
MemSet(&clientaddr, 0, sizeof(clientaddr));
2392
* Initialize my status entry, following the protocol of bumping
2393
* st_changecount before and after; and make sure it's even afterwards. We
2394
* use a volatile pointer here to ensure the compiler doesn't try to get
2397
beentry = MyBEEntry;
2400
beentry->st_changecount++;
2401
} while ((beentry->st_changecount & 1) == 0);
2403
beentry->st_procpid = MyProcPid;
2404
beentry->st_proc_start_timestamp = proc_start_timestamp;
2405
beentry->st_activity_start_timestamp = 0;
2406
beentry->st_xact_start_timestamp = 0;
2407
beentry->st_databaseid = MyDatabaseId;
2408
beentry->st_userid = userid;
2409
beentry->st_clientaddr = clientaddr;
2410
beentry->st_clienthostname[0] = '\0';
2411
beentry->st_waiting = false;
2412
beentry->st_appname[0] = '\0';
2413
beentry->st_activity[0] = '\0';
2414
/* Also make sure the last byte in each string area is always 0 */
2415
beentry->st_clienthostname[NAMEDATALEN - 1] = '\0';
2416
beentry->st_appname[NAMEDATALEN - 1] = '\0';
2417
beentry->st_activity[pgstat_track_activity_query_size - 1] = '\0';
2419
beentry->st_changecount++;
2420
Assert((beentry->st_changecount & 1) == 0);
2422
if (MyProcPort && MyProcPort->remote_hostname)
2423
strlcpy(beentry->st_clienthostname, MyProcPort->remote_hostname, NAMEDATALEN);
2425
/* Update app name to current GUC setting */
2426
if (application_name)
2427
pgstat_report_appname(application_name);
2431
* Shut down a single backend's statistics reporting at process exit.
2433
* Flush any remaining statistics counts out to the collector.
2434
* Without this, operations triggered during backend exit (such as
2435
* temp table deletions) won't be counted.
2437
* Lastly, clear out our entry in the PgBackendStatus array.
2440
pgstat_beshutdown_hook(int code, Datum arg)
2442
volatile PgBackendStatus *beentry = MyBEEntry;
2445
* If we got as far as discovering our own database ID, we can report what
2446
* we did to the collector. Otherwise, we'd be sending an invalid
2447
* database ID, so forget it. (This means that accesses to pg_database
2448
* during failed backend starts might never get counted.)
2450
if (OidIsValid(MyDatabaseId))
2451
pgstat_report_stat(true);
2454
* Clear my status entry, following the protocol of bumping st_changecount
2455
* before and after. We use a volatile pointer here to ensure the
2456
* compiler doesn't try to get cute.
2458
beentry->st_changecount++;
2460
beentry->st_procpid = 0; /* mark invalid */
2462
beentry->st_changecount++;
2463
Assert((beentry->st_changecount & 1) == 0);
2468
* pgstat_report_activity() -
2470
* Called from tcop/postgres.c to report what the backend is actually doing
2471
* (usually "<IDLE>" or the start of the query to be executed).
2475
pgstat_report_activity(const char *cmd_str)
2477
volatile PgBackendStatus *beentry = MyBEEntry;
2478
TimestampTz start_timestamp;
2481
TRACE_POSTGRESQL_STATEMENT_STATUS(cmd_str);
2483
if (!pgstat_track_activities || !beentry)
2487
* To minimize the time spent modifying the entry, fetch all the needed
2490
start_timestamp = GetCurrentStatementStartTimestamp();
2492
len = strlen(cmd_str);
2493
len = pg_mbcliplen(cmd_str, len, pgstat_track_activity_query_size - 1);
2496
* Update my status entry, following the protocol of bumping
2497
* st_changecount before and after. We use a volatile pointer here to
2498
* ensure the compiler doesn't try to get cute.
2500
beentry->st_changecount++;
2502
beentry->st_activity_start_timestamp = start_timestamp;
2503
memcpy((char *) beentry->st_activity, cmd_str, len);
2504
beentry->st_activity[len] = '\0';
2506
beentry->st_changecount++;
2507
Assert((beentry->st_changecount & 1) == 0);
2511
* pgstat_report_appname() -
2513
* Called to update our application name.
2517
pgstat_report_appname(const char *appname)
2519
volatile PgBackendStatus *beentry = MyBEEntry;
2525
/* This should be unnecessary if GUC did its job, but be safe */
2526
len = pg_mbcliplen(appname, strlen(appname), NAMEDATALEN - 1);
2529
* Update my status entry, following the protocol of bumping
2530
* st_changecount before and after. We use a volatile pointer here to
2531
* ensure the compiler doesn't try to get cute.
2533
beentry->st_changecount++;
2535
memcpy((char *) beentry->st_appname, appname, len);
2536
beentry->st_appname[len] = '\0';
2538
beentry->st_changecount++;
2539
Assert((beentry->st_changecount & 1) == 0);
2543
* Report current transaction start timestamp as the specified value.
2544
* Zero means there is no active transaction.
2547
pgstat_report_xact_timestamp(TimestampTz tstamp)
2549
volatile PgBackendStatus *beentry = MyBEEntry;
2551
if (!pgstat_track_activities || !beentry)
2555
* Update my status entry, following the protocol of bumping
2556
* st_changecount before and after. We use a volatile pointer here to
2557
* ensure the compiler doesn't try to get cute.
2559
beentry->st_changecount++;
2560
beentry->st_xact_start_timestamp = tstamp;
2561
beentry->st_changecount++;
2562
Assert((beentry->st_changecount & 1) == 0);
2566
* pgstat_report_waiting() -
2568
* Called from lock manager to report beginning or end of a lock wait.
2570
* NB: this *must* be able to survive being called before MyBEEntry has been
2575
pgstat_report_waiting(bool waiting)
2577
volatile PgBackendStatus *beentry = MyBEEntry;
2579
if (!pgstat_track_activities || !beentry)
2583
* Since this is a single-byte field in a struct that only this process
2584
* may modify, there seems no need to bother with the st_changecount
2585
* protocol. The update must appear atomic in any case.
2587
beentry->st_waiting = waiting;
2592
* pgstat_read_current_status() -
2594
* Copy the current contents of the PgBackendStatus array to local memory,
2595
* if not already done in this transaction.
2599
pgstat_read_current_status(void)
2601
volatile PgBackendStatus *beentry;
2602
PgBackendStatus *localtable;
2603
PgBackendStatus *localentry;
2608
Assert(!pgStatRunningInCollector);
2609
if (localBackendStatusTable)
2610
return; /* already done */
2612
pgstat_setup_memcxt();
2614
localtable = (PgBackendStatus *)
2615
MemoryContextAlloc(pgStatLocalContext,
2616
sizeof(PgBackendStatus) * MaxBackends);
2617
localappname = (char *)
2618
MemoryContextAlloc(pgStatLocalContext,
2619
NAMEDATALEN * MaxBackends);
2620
localactivity = (char *)
2621
MemoryContextAlloc(pgStatLocalContext,
2622
pgstat_track_activity_query_size * MaxBackends);
2623
localNumBackends = 0;
2625
beentry = BackendStatusArray;
2626
localentry = localtable;
2627
for (i = 1; i <= MaxBackends; i++)
2630
* Follow the protocol of retrying if st_changecount changes while we
2631
* copy the entry, or if it's odd. (The check for odd is needed to
2632
* cover the case where we are able to completely copy the entry while
2633
* the source backend is between increment steps.) We use a volatile
2634
* pointer here to ensure the compiler doesn't try to get cute.
2638
int save_changecount = beentry->st_changecount;
2640
localentry->st_procpid = beentry->st_procpid;
2641
if (localentry->st_procpid > 0)
2643
memcpy(localentry, (char *) beentry, sizeof(PgBackendStatus));
2646
* strcpy is safe even if the string is modified concurrently,
2647
* because there's always a \0 at the end of the buffer.
2649
strcpy(localappname, (char *) beentry->st_appname);
2650
localentry->st_appname = localappname;
2651
strcpy(localactivity, (char *) beentry->st_activity);
2652
localentry->st_activity = localactivity;
2655
if (save_changecount == beentry->st_changecount &&
2656
(save_changecount & 1) == 0)
2659
/* Make sure we can break out of loop if stuck... */
2660
CHECK_FOR_INTERRUPTS();
2664
/* Only valid entries get included into the local array */
2665
if (localentry->st_procpid > 0)
2668
localappname += NAMEDATALEN;
2669
localactivity += pgstat_track_activity_query_size;
2674
/* Set the pointer only after completion of a valid table */
2675
localBackendStatusTable = localtable;
2680
* pgstat_get_backend_current_activity() -
2682
* Return a string representing the current activity of the backend with
2683
* the specified PID. This looks directly at the BackendStatusArray,
2684
* and so will provide current information regardless of the age of our
2685
* transaction's snapshot of the status array.
2687
* It is the caller's responsibility to invoke this only for backends whose
2688
* state is expected to remain stable while the result is in use. The
2689
* only current use is in deadlock reporting, where we can expect that
2690
* the target backend is blocked on a lock. (There are corner cases
2691
* where the target's wait could get aborted while we are looking at it,
2692
* but the very worst consequence is to return a pointer to a string
2693
* that's been changed, so we won't worry too much.)
2695
* Note: return strings for special cases match pg_stat_get_backend_activity.
2699
pgstat_get_backend_current_activity(int pid, bool checkUser)
2701
PgBackendStatus *beentry;
2704
beentry = BackendStatusArray;
2705
for (i = 1; i <= MaxBackends; i++)
2708
* Although we expect the target backend's entry to be stable, that
2709
* doesn't imply that anyone else's is. To avoid identifying the
2710
* wrong backend, while we check for a match to the desired PID we
2711
* must follow the protocol of retrying if st_changecount changes
2712
* while we examine the entry, or if it's odd. (This might be
2713
* unnecessary, since fetching or storing an int is almost certainly
2714
* atomic, but let's play it safe.) We use a volatile pointer here to
2715
* ensure the compiler doesn't try to get cute.
2717
volatile PgBackendStatus *vbeentry = beentry;
2722
int save_changecount = vbeentry->st_changecount;
2724
found = (vbeentry->st_procpid == pid);
2726
if (save_changecount == vbeentry->st_changecount &&
2727
(save_changecount & 1) == 0)
2730
/* Make sure we can break out of loop if stuck... */
2731
CHECK_FOR_INTERRUPTS();
2736
/* Now it is safe to use the non-volatile pointer */
2737
if (checkUser && !superuser() && beentry->st_userid != GetUserId())
2738
return "<insufficient privilege>";
2739
else if (*(beentry->st_activity) == '\0')
2740
return "<command string not enabled>";
2742
return beentry->st_activity;
2748
/* If we get here, caller is in error ... */
2749
return "<backend information not available>";
2753
/* ------------------------------------------------------------
2754
* Local support functions follow
2755
* ------------------------------------------------------------
2760
* pgstat_setheader() -
2762
* Set common header fields in a statistics message
2766
pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype)
2768
hdr->m_type = mtype;
2775
* Send out one statistics message to the collector
2779
pgstat_send(void *msg, int len)
2783
if (pgStatSock == PGINVALID_SOCKET)
2786
((PgStat_MsgHdr *) msg)->m_size = len;
2788
/* We'll retry after EINTR, but ignore all other failures */
2791
rc = send(pgStatSock, msg, len, 0);
2792
} while (rc < 0 && errno == EINTR);
2794
#ifdef USE_ASSERT_CHECKING
2795
/* In debug builds, log send failures ... */
2797
elog(LOG, "could not send to statistics collector: %m");
2802
* pgstat_send_bgwriter() -
2804
* Send bgwriter statistics to the collector
2808
pgstat_send_bgwriter(void)
2810
/* We assume this initializes to zeroes */
2811
static const PgStat_MsgBgWriter all_zeroes;
2814
* This function can be called even if nothing at all has happened. In
2815
* this case, avoid sending a completely empty message to the stats
2818
if (memcmp(&BgWriterStats, &all_zeroes, sizeof(PgStat_MsgBgWriter)) == 0)
2822
* Prepare and send the message
2824
pgstat_setheader(&BgWriterStats.m_hdr, PGSTAT_MTYPE_BGWRITER);
2825
pgstat_send(&BgWriterStats, sizeof(BgWriterStats));
2828
* Clear out the statistics buffer, so it can be re-used.
2830
MemSet(&BgWriterStats, 0, sizeof(BgWriterStats));
2835
* PgstatCollectorMain() -
2837
* Start up the statistics collector process. This is the body of the
2838
* postmaster child process.
2840
* The argc/argv parameters are valid only in EXEC_BACKEND case.
2843
NON_EXEC_STATIC void
2844
PgstatCollectorMain(int argc, char *argv[])
2851
struct pollfd input_fd;
2853
struct timeval sel_timeout;
2858
IsUnderPostmaster = true; /* we are a postmaster subprocess now */
2860
MyProcPid = getpid(); /* reset MyProcPid */
2862
MyStartTime = time(NULL); /* record Start Time for logging */
2865
* If possible, make this process a group leader, so that the postmaster
2866
* can signal any child processes too. (pgstat probably never has any
2867
* child processes, but for consistency we make all postmaster child
2868
* processes do this.)
2872
elog(FATAL, "setsid() failed: %m");
2876
* Ignore all signals usually bound to some action in the postmaster,
2879
pqsignal(SIGHUP, pgstat_sighup_handler);
2880
pqsignal(SIGINT, SIG_IGN);
2881
pqsignal(SIGTERM, SIG_IGN);
2882
pqsignal(SIGQUIT, pgstat_exit);
2883
pqsignal(SIGALRM, SIG_IGN);
2884
pqsignal(SIGPIPE, SIG_IGN);
2885
pqsignal(SIGUSR1, SIG_IGN);
2886
pqsignal(SIGUSR2, SIG_IGN);
2887
pqsignal(SIGCHLD, SIG_DFL);
2888
pqsignal(SIGTTIN, SIG_DFL);
2889
pqsignal(SIGTTOU, SIG_DFL);
2890
pqsignal(SIGCONT, SIG_DFL);
2891
pqsignal(SIGWINCH, SIG_DFL);
2892
PG_SETMASK(&UnBlockSig);
2895
* Identify myself via ps
2897
init_ps_display("stats collector process", "", "", "");
2900
* Arrange to write the initial status file right away
2902
last_statrequest = GetCurrentTimestamp();
2903
last_statwrite = last_statrequest - 1;
2906
* Read in an existing statistics stats file or initialize the stats to
2909
pgStatRunningInCollector = true;
2910
pgStatDBHash = pgstat_read_statsfile(InvalidOid, true);
2913
* Setup the descriptor set for select(2). Since only one bit in the set
2914
* ever changes, we need not repeat FD_ZERO each time.
2916
#if !defined(HAVE_POLL) && !defined(WIN32)
2921
* Loop to process messages until we get SIGQUIT or detect ungraceful
2922
* death of our parent postmaster.
2924
* For performance reasons, we don't want to do a PostmasterIsAlive() test
2925
* after every message; instead, do it only when select()/poll() is
2926
* interrupted by timeout. In essence, we'll stay alive as long as
2927
* backends keep sending us stuff often, even if the postmaster is gone.
2934
* Quit if we get SIGQUIT from the postmaster.
2940
* Reload configuration if we got SIGHUP from the postmaster.
2944
ProcessConfigFile(PGC_SIGHUP);
2949
* Write the stats file if a new request has arrived that is not
2950
* satisfied by existing file.
2952
if (last_statwrite < last_statrequest)
2953
pgstat_write_statsfile(false);
2956
* Wait for a message to arrive; but not for more than
2957
* PGSTAT_SELECT_TIMEOUT seconds. (This determines how quickly we will
2958
* shut down after an ungraceful postmaster termination; so it needn't
2959
* be very fast. However, on some systems SIGQUIT won't interrupt the
2960
* poll/select call, so this also limits speed of response to SIGQUIT,
2961
* which is more important.)
2963
* We use poll(2) if available, otherwise select(2). Win32 has its own
2968
input_fd.fd = pgStatSock;
2969
input_fd.events = POLLIN | POLLERR;
2970
input_fd.revents = 0;
2972
if (poll(&input_fd, 1, PGSTAT_SELECT_TIMEOUT * 1000) < 0)
2977
(errcode_for_socket_access(),
2978
errmsg("poll() failed in statistics collector: %m")));
2981
got_data = (input_fd.revents != 0);
2982
#else /* !HAVE_POLL */
2984
FD_SET(pgStatSock, &rfds);
2987
* timeout struct is modified by select() on some operating systems,
2988
* so re-fill it each time.
2990
sel_timeout.tv_sec = PGSTAT_SELECT_TIMEOUT;
2991
sel_timeout.tv_usec = 0;
2993
if (select(pgStatSock + 1, &rfds, NULL, NULL, &sel_timeout) < 0)
2998
(errcode_for_socket_access(),
2999
errmsg("select() failed in statistics collector: %m")));
3002
got_data = FD_ISSET(pgStatSock, &rfds);
3003
#endif /* HAVE_POLL */
3005
got_data = pgwin32_waitforsinglesocket(pgStatSock, FD_READ,
3006
PGSTAT_SELECT_TIMEOUT * 1000);
3010
* If there is a message on the socket, read it and check for
3015
len = recv(pgStatSock, (char *) &msg,
3016
sizeof(PgStat_Msg), 0);
3022
(errcode_for_socket_access(),
3023
errmsg("could not read statistics message: %m")));
3027
* We ignore messages that are smaller than our common header
3029
if (len < sizeof(PgStat_MsgHdr))
3033
* The received length must match the length in the header
3035
if (msg.msg_hdr.m_size != len)
3039
* O.K. - we accept this message. Process it.
3041
switch (msg.msg_hdr.m_type)
3043
case PGSTAT_MTYPE_DUMMY:
3046
case PGSTAT_MTYPE_INQUIRY:
3047
pgstat_recv_inquiry((PgStat_MsgInquiry *) &msg, len);
3050
case PGSTAT_MTYPE_TABSTAT:
3051
pgstat_recv_tabstat((PgStat_MsgTabstat *) &msg, len);
3054
case PGSTAT_MTYPE_TABPURGE:
3055
pgstat_recv_tabpurge((PgStat_MsgTabpurge *) &msg, len);
3058
case PGSTAT_MTYPE_DROPDB:
3059
pgstat_recv_dropdb((PgStat_MsgDropdb *) &msg, len);
3062
case PGSTAT_MTYPE_RESETCOUNTER:
3063
pgstat_recv_resetcounter((PgStat_MsgResetcounter *) &msg,
3067
case PGSTAT_MTYPE_RESETSHAREDCOUNTER:
3068
pgstat_recv_resetsharedcounter(
3069
(PgStat_MsgResetsharedcounter *) &msg,
3073
case PGSTAT_MTYPE_RESETSINGLECOUNTER:
3074
pgstat_recv_resetsinglecounter(
3075
(PgStat_MsgResetsinglecounter *) &msg,
3079
case PGSTAT_MTYPE_AUTOVAC_START:
3080
pgstat_recv_autovac((PgStat_MsgAutovacStart *) &msg, len);
3083
case PGSTAT_MTYPE_VACUUM:
3084
pgstat_recv_vacuum((PgStat_MsgVacuum *) &msg, len);
3087
case PGSTAT_MTYPE_ANALYZE:
3088
pgstat_recv_analyze((PgStat_MsgAnalyze *) &msg, len);
3091
case PGSTAT_MTYPE_BGWRITER:
3092
pgstat_recv_bgwriter((PgStat_MsgBgWriter *) &msg, len);
3095
case PGSTAT_MTYPE_FUNCSTAT:
3096
pgstat_recv_funcstat((PgStat_MsgFuncstat *) &msg, len);
3099
case PGSTAT_MTYPE_FUNCPURGE:
3100
pgstat_recv_funcpurge((PgStat_MsgFuncpurge *) &msg, len);
3103
case PGSTAT_MTYPE_RECOVERYCONFLICT:
3104
pgstat_recv_recoveryconflict((PgStat_MsgRecoveryConflict *) &msg, len);
3114
* We can only get here if the select/poll timeout elapsed. Check
3115
* for postmaster death.
3117
if (!PostmasterIsAlive(true))
3120
} /* end of message-processing loop */
3123
* Save the final stats to reuse at next startup.
3125
pgstat_write_statsfile(true);
3131
/* SIGQUIT signal handler for collector process */
3133
pgstat_exit(SIGNAL_ARGS)
3138
/* SIGHUP handler for collector process */
3140
pgstat_sighup_handler(SIGNAL_ARGS)
3147
* Lookup the hash table entry for the specified database. If no hash
3148
* table entry exists, initialize it, if the create parameter is true.
3149
* Else, return NULL.
3151
static PgStat_StatDBEntry *
3152
pgstat_get_db_entry(Oid databaseid, bool create)
3154
PgStat_StatDBEntry *result;
3156
HASHACTION action = (create ? HASH_ENTER : HASH_FIND);
3158
/* Lookup or create the hash table entry for this database */
3159
result = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
3163
if (!create && !found)
3166
/* If not found, initialize the new one. */
3171
result->tables = NULL;
3172
result->functions = NULL;
3173
result->n_xact_commit = 0;
3174
result->n_xact_rollback = 0;
3175
result->n_blocks_fetched = 0;
3176
result->n_blocks_hit = 0;
3177
result->n_tuples_returned = 0;
3178
result->n_tuples_fetched = 0;
3179
result->n_tuples_inserted = 0;
3180
result->n_tuples_updated = 0;
3181
result->n_tuples_deleted = 0;
3182
result->last_autovac_time = 0;
3183
result->n_conflict_tablespace = 0;
3184
result->n_conflict_lock = 0;
3185
result->n_conflict_snapshot = 0;
3186
result->n_conflict_bufferpin = 0;
3187
result->n_conflict_startup_deadlock = 0;
3189
result->stat_reset_timestamp = GetCurrentTimestamp();
3191
memset(&hash_ctl, 0, sizeof(hash_ctl));
3192
hash_ctl.keysize = sizeof(Oid);
3193
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
3194
hash_ctl.hash = oid_hash;
3195
result->tables = hash_create("Per-database table",
3196
PGSTAT_TAB_HASH_SIZE,
3198
HASH_ELEM | HASH_FUNCTION);
3200
hash_ctl.keysize = sizeof(Oid);
3201
hash_ctl.entrysize = sizeof(PgStat_StatFuncEntry);
3202
hash_ctl.hash = oid_hash;
3203
result->functions = hash_create("Per-database function",
3204
PGSTAT_FUNCTION_HASH_SIZE,
3206
HASH_ELEM | HASH_FUNCTION);
3214
* Lookup the hash table entry for the specified table. If no hash
3215
* table entry exists, initialize it, if the create parameter is true.
3216
* Else, return NULL.
3218
static PgStat_StatTabEntry *
3219
pgstat_get_tab_entry(PgStat_StatDBEntry *dbentry, Oid tableoid, bool create)
3221
PgStat_StatTabEntry *result;
3223
HASHACTION action = (create ? HASH_ENTER : HASH_FIND);
3225
/* Lookup or create the hash table entry for this table */
3226
result = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
3230
if (!create && !found)
3233
/* If not found, initialize the new one. */
3236
result->numscans = 0;
3237
result->tuples_returned = 0;
3238
result->tuples_fetched = 0;
3239
result->tuples_inserted = 0;
3240
result->tuples_updated = 0;
3241
result->tuples_deleted = 0;
3242
result->tuples_hot_updated = 0;
3243
result->n_live_tuples = 0;
3244
result->n_dead_tuples = 0;
3245
result->changes_since_analyze = 0;
3246
result->blocks_fetched = 0;
3247
result->blocks_hit = 0;
3248
result->vacuum_timestamp = 0;
3249
result->vacuum_count = 0;
3250
result->autovac_vacuum_timestamp = 0;
3251
result->autovac_vacuum_count = 0;
3252
result->analyze_timestamp = 0;
3253
result->analyze_count = 0;
3254
result->autovac_analyze_timestamp = 0;
3255
result->autovac_analyze_count = 0;
3263
* pgstat_write_statsfile() -
3266
* If writing to the permanent file (happens when the collector is
3267
* shutting down only), remove the temporary file so that backends
3268
* starting up under a new postmaster can't read the old data before
3269
* the new collector is ready.
3273
pgstat_write_statsfile(bool permanent)
3275
HASH_SEQ_STATUS hstat;
3276
HASH_SEQ_STATUS tstat;
3277
HASH_SEQ_STATUS fstat;
3278
PgStat_StatDBEntry *dbentry;
3279
PgStat_StatTabEntry *tabentry;
3280
PgStat_StatFuncEntry *funcentry;
3283
const char *tmpfile = permanent ? PGSTAT_STAT_PERMANENT_TMPFILE : pgstat_stat_tmpname;
3284
const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
3287
* Open the statistics temp file to write out the current values.
3289
fpout = AllocateFile(tmpfile, PG_BINARY_W);
3293
(errcode_for_file_access(),
3294
errmsg("could not open temporary statistics file \"%s\": %m",
3300
* Set the timestamp of the stats file.
3302
globalStats.stats_timestamp = GetCurrentTimestamp();
3305
* Write the file header --- currently just a format ID.
3307
format_id = PGSTAT_FILE_FORMAT_ID;
3308
fwrite(&format_id, sizeof(format_id), 1, fpout);
3311
* Write global stats struct
3313
fwrite(&globalStats, sizeof(globalStats), 1, fpout);
3316
* Walk through the database table.
3318
hash_seq_init(&hstat, pgStatDBHash);
3319
while ((dbentry = (PgStat_StatDBEntry *) hash_seq_search(&hstat)) != NULL)
3322
* Write out the DB entry including the number of live backends. We
3323
* don't write the tables or functions pointers, since they're of no
3324
* use to any other process.
3327
fwrite(dbentry, offsetof(PgStat_StatDBEntry, tables), 1, fpout);
3330
* Walk through the database's access stats per table.
3332
hash_seq_init(&tstat, dbentry->tables);
3333
while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&tstat)) != NULL)
3336
fwrite(tabentry, sizeof(PgStat_StatTabEntry), 1, fpout);
3340
* Walk through the database's function stats table.
3342
hash_seq_init(&fstat, dbentry->functions);
3343
while ((funcentry = (PgStat_StatFuncEntry *) hash_seq_search(&fstat)) != NULL)
3346
fwrite(funcentry, sizeof(PgStat_StatFuncEntry), 1, fpout);
3350
* Mark the end of this DB
3356
* No more output to be done. Close the temp file and replace the old
3357
* pgstat.stat with it. The ferror() check replaces testing for error
3358
* after each individual fputc or fwrite above.
3365
(errcode_for_file_access(),
3366
errmsg("could not write temporary statistics file \"%s\": %m",
3371
else if (FreeFile(fpout) < 0)
3374
(errcode_for_file_access(),
3375
errmsg("could not close temporary statistics file \"%s\": %m",
3379
else if (rename(tmpfile, statfile) < 0)
3382
(errcode_for_file_access(),
3383
errmsg("could not rename temporary statistics file \"%s\" to \"%s\": %m",
3384
tmpfile, statfile)));
3390
* Successful write, so update last_statwrite.
3392
last_statwrite = globalStats.stats_timestamp;
3395
* If there is clock skew between backends and the collector, we could
3396
* receive a stats request time that's in the future. If so, complain
3397
* and reset last_statrequest. Resetting ensures that no inquiry
3398
* message can cause more than one stats file write to occur.
3400
if (last_statrequest > last_statwrite)
3405
/* Copy because timestamptz_to_str returns a static buffer */
3406
reqtime = pstrdup(timestamptz_to_str(last_statrequest));
3407
mytime = pstrdup(timestamptz_to_str(last_statwrite));
3408
elog(LOG, "last_statrequest %s is later than collector's time %s",
3413
last_statrequest = last_statwrite;
3418
unlink(pgstat_stat_filename);
3423
* pgstat_read_statsfile() -
3425
* Reads in an existing statistics collector file and initializes the
3426
* databases' hash table (whose entries point to the tables' hash tables).
3430
pgstat_read_statsfile(Oid onlydb, bool permanent)
3432
PgStat_StatDBEntry *dbentry;
3433
PgStat_StatDBEntry dbbuf;
3434
PgStat_StatTabEntry *tabentry;
3435
PgStat_StatTabEntry tabbuf;
3436
PgStat_StatFuncEntry funcbuf;
3437
PgStat_StatFuncEntry *funcentry;
3440
HTAB *tabhash = NULL;
3441
HTAB *funchash = NULL;
3445
const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
3448
* The tables will live in pgStatLocalContext.
3450
pgstat_setup_memcxt();
3453
* Create the DB hashtable
3455
memset(&hash_ctl, 0, sizeof(hash_ctl));
3456
hash_ctl.keysize = sizeof(Oid);
3457
hash_ctl.entrysize = sizeof(PgStat_StatDBEntry);
3458
hash_ctl.hash = oid_hash;
3459
hash_ctl.hcxt = pgStatLocalContext;
3460
dbhash = hash_create("Databases hash", PGSTAT_DB_HASH_SIZE, &hash_ctl,
3461
HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
3464
* Clear out global statistics so they start from zero in case we can't
3465
* load an existing statsfile.
3467
memset(&globalStats, 0, sizeof(globalStats));
3470
* Set the current timestamp (will be kept only in case we can't load an
3471
* existing statsfile.
3473
globalStats.stat_reset_timestamp = GetCurrentTimestamp();
3476
* Try to open the status file. If it doesn't exist, the backends simply
3477
* return zero for anything and the collector simply starts from scratch
3478
* with empty counters.
3480
* ENOENT is a possibility if the stats collector is not running or has
3481
* not yet written the stats file the first time. Any other failure
3482
* condition is suspicious.
3484
if ((fpin = AllocateFile(statfile, PG_BINARY_R)) == NULL)
3486
if (errno != ENOENT)
3487
ereport(pgStatRunningInCollector ? LOG : WARNING,
3488
(errcode_for_file_access(),
3489
errmsg("could not open statistics file \"%s\": %m",
3495
* Verify it's of the expected format.
3497
if (fread(&format_id, 1, sizeof(format_id), fpin) != sizeof(format_id)
3498
|| format_id != PGSTAT_FILE_FORMAT_ID)
3500
ereport(pgStatRunningInCollector ? LOG : WARNING,
3501
(errmsg("corrupted statistics file \"%s\"", statfile)));
3506
* Read global stats struct
3508
if (fread(&globalStats, 1, sizeof(globalStats), fpin) != sizeof(globalStats))
3510
ereport(pgStatRunningInCollector ? LOG : WARNING,
3511
(errmsg("corrupted statistics file \"%s\"", statfile)));
3516
* We found an existing collector stats file. Read it and put all the
3517
* hashtable entries into place.
3521
switch (fgetc(fpin))
3524
* 'D' A PgStat_StatDBEntry struct describing a database
3525
* follows. Subsequently, zero to many 'T' and 'F' entries
3526
* will follow until a 'd' is encountered.
3529
if (fread(&dbbuf, 1, offsetof(PgStat_StatDBEntry, tables),
3530
fpin) != offsetof(PgStat_StatDBEntry, tables))
3532
ereport(pgStatRunningInCollector ? LOG : WARNING,
3533
(errmsg("corrupted statistics file \"%s\"",
3539
* Add to the DB hash
3541
dbentry = (PgStat_StatDBEntry *) hash_search(dbhash,
3542
(void *) &dbbuf.databaseid,
3547
ereport(pgStatRunningInCollector ? LOG : WARNING,
3548
(errmsg("corrupted statistics file \"%s\"",
3553
memcpy(dbentry, &dbbuf, sizeof(PgStat_StatDBEntry));
3554
dbentry->tables = NULL;
3555
dbentry->functions = NULL;
3558
* Don't collect tables if not the requested DB (or the
3559
* shared-table info)
3561
if (onlydb != InvalidOid)
3563
if (dbbuf.databaseid != onlydb &&
3564
dbbuf.databaseid != InvalidOid)
3568
memset(&hash_ctl, 0, sizeof(hash_ctl));
3569
hash_ctl.keysize = sizeof(Oid);
3570
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
3571
hash_ctl.hash = oid_hash;
3572
hash_ctl.hcxt = pgStatLocalContext;
3573
dbentry->tables = hash_create("Per-database table",
3574
PGSTAT_TAB_HASH_SIZE,
3576
HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
3578
hash_ctl.keysize = sizeof(Oid);
3579
hash_ctl.entrysize = sizeof(PgStat_StatFuncEntry);
3580
hash_ctl.hash = oid_hash;
3581
hash_ctl.hcxt = pgStatLocalContext;
3582
dbentry->functions = hash_create("Per-database function",
3583
PGSTAT_FUNCTION_HASH_SIZE,
3585
HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
3588
* Arrange that following records add entries to this
3589
* database's hash tables.
3591
tabhash = dbentry->tables;
3592
funchash = dbentry->functions;
3596
* 'd' End of this database.
3604
* 'T' A PgStat_StatTabEntry follows.
3607
if (fread(&tabbuf, 1, sizeof(PgStat_StatTabEntry),
3608
fpin) != sizeof(PgStat_StatTabEntry))
3610
ereport(pgStatRunningInCollector ? LOG : WARNING,
3611
(errmsg("corrupted statistics file \"%s\"",
3617
* Skip if table belongs to a not requested database.
3619
if (tabhash == NULL)
3622
tabentry = (PgStat_StatTabEntry *) hash_search(tabhash,
3623
(void *) &tabbuf.tableid,
3624
HASH_ENTER, &found);
3628
ereport(pgStatRunningInCollector ? LOG : WARNING,
3629
(errmsg("corrupted statistics file \"%s\"",
3634
memcpy(tabentry, &tabbuf, sizeof(tabbuf));
3638
* 'F' A PgStat_StatFuncEntry follows.
3641
if (fread(&funcbuf, 1, sizeof(PgStat_StatFuncEntry),
3642
fpin) != sizeof(PgStat_StatFuncEntry))
3644
ereport(pgStatRunningInCollector ? LOG : WARNING,
3645
(errmsg("corrupted statistics file \"%s\"",
3651
* Skip if function belongs to a not requested database.
3653
if (funchash == NULL)
3656
funcentry = (PgStat_StatFuncEntry *) hash_search(funchash,
3657
(void *) &funcbuf.functionid,
3658
HASH_ENTER, &found);
3662
ereport(pgStatRunningInCollector ? LOG : WARNING,
3663
(errmsg("corrupted statistics file \"%s\"",
3668
memcpy(funcentry, &funcbuf, sizeof(funcbuf));
3672
* 'E' The EOF marker of a complete stats file.
3678
ereport(pgStatRunningInCollector ? LOG : WARNING,
3679
(errmsg("corrupted statistics file \"%s\"",
3689
unlink(PGSTAT_STAT_PERMANENT_FILENAME);
3695
* pgstat_read_statsfile_timestamp() -
3697
* Attempt to fetch the timestamp of an existing stats file.
3698
* Returns TRUE if successful (timestamp is stored at *ts).
3702
pgstat_read_statsfile_timestamp(bool permanent, TimestampTz *ts)
3704
PgStat_GlobalStats myGlobalStats;
3707
const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
3710
* Try to open the status file. As above, anything but ENOENT is worthy
3711
* of complaining about.
3713
if ((fpin = AllocateFile(statfile, PG_BINARY_R)) == NULL)
3715
if (errno != ENOENT)
3716
ereport(pgStatRunningInCollector ? LOG : WARNING,
3717
(errcode_for_file_access(),
3718
errmsg("could not open statistics file \"%s\": %m",
3724
* Verify it's of the expected format.
3726
if (fread(&format_id, 1, sizeof(format_id), fpin) != sizeof(format_id)
3727
|| format_id != PGSTAT_FILE_FORMAT_ID)
3729
ereport(pgStatRunningInCollector ? LOG : WARNING,
3730
(errmsg("corrupted statistics file \"%s\"", statfile)));
3736
* Read global stats struct
3738
if (fread(&myGlobalStats, 1, sizeof(myGlobalStats), fpin) != sizeof(myGlobalStats))
3740
ereport(pgStatRunningInCollector ? LOG : WARNING,
3741
(errmsg("corrupted statistics file \"%s\"", statfile)));
3746
*ts = myGlobalStats.stats_timestamp;
3753
* If not already done, read the statistics collector stats file into
3754
* some hash tables. The results will be kept until pgstat_clear_snapshot()
3755
* is called (typically, at end of transaction).
3758
backend_read_statsfile(void)
3763
/* already read it? */
3766
Assert(!pgStatRunningInCollector);
3769
* We set the minimum acceptable timestamp to PGSTAT_STAT_INTERVAL msec
3770
* before now. This indirectly ensures that the collector needn't write
3771
* the file more often than PGSTAT_STAT_INTERVAL. In an autovacuum
3772
* worker, however, we want a lower delay to avoid using stale data, so we
3773
* use PGSTAT_RETRY_DELAY (since the number of worker is low, this
3774
* shouldn't be a problem).
3776
* Note that we don't recompute min_ts after sleeping; so we might end up
3777
* accepting a file a bit older than PGSTAT_STAT_INTERVAL. In practice
3778
* that shouldn't happen, though, as long as the sleep time is less than
3779
* PGSTAT_STAT_INTERVAL; and we don't want to lie to the collector about
3780
* what our cutoff time really is.
3782
if (IsAutoVacuumWorkerProcess())
3783
min_ts = TimestampTzPlusMilliseconds(GetCurrentTimestamp(),
3784
-PGSTAT_RETRY_DELAY);
3786
min_ts = TimestampTzPlusMilliseconds(GetCurrentTimestamp(),
3787
-PGSTAT_STAT_INTERVAL);
3790
* Loop until fresh enough stats file is available or we ran out of time.
3791
* The stats inquiry message is sent repeatedly in case collector drops
3794
for (count = 0; count < PGSTAT_POLL_LOOP_COUNT; count++)
3796
TimestampTz file_ts = 0;
3798
CHECK_FOR_INTERRUPTS();
3800
if (pgstat_read_statsfile_timestamp(false, &file_ts) &&
3804
/* Not there or too old, so kick the collector and wait a bit */
3805
pgstat_send_inquiry(min_ts);
3806
pg_usleep(PGSTAT_RETRY_DELAY * 1000L);
3809
if (count >= PGSTAT_POLL_LOOP_COUNT)
3810
elog(WARNING, "pgstat wait timeout");
3812
/* Autovacuum launcher wants stats about all databases */
3813
if (IsAutoVacuumLauncherProcess())
3814
pgStatDBHash = pgstat_read_statsfile(InvalidOid, false);
3816
pgStatDBHash = pgstat_read_statsfile(MyDatabaseId, false);
3821
* pgstat_setup_memcxt() -
3823
* Create pgStatLocalContext, if not already done.
3827
pgstat_setup_memcxt(void)
3829
if (!pgStatLocalContext)
3830
pgStatLocalContext = AllocSetContextCreate(TopMemoryContext,
3831
"Statistics snapshot",
3832
ALLOCSET_SMALL_MINSIZE,
3833
ALLOCSET_SMALL_INITSIZE,
3834
ALLOCSET_SMALL_MAXSIZE);
3839
* pgstat_clear_snapshot() -
3841
* Discard any data collected in the current transaction. Any subsequent
3842
* request will cause new snapshots to be read.
3844
* This is also invoked during transaction commit or abort to discard
3845
* the no-longer-wanted snapshot.
3849
pgstat_clear_snapshot(void)
3851
/* Release memory, if any was allocated */
3852
if (pgStatLocalContext)
3853
MemoryContextDelete(pgStatLocalContext);
3855
/* Reset variables */
3856
pgStatLocalContext = NULL;
3857
pgStatDBHash = NULL;
3858
localBackendStatusTable = NULL;
3859
localNumBackends = 0;
3864
* pgstat_recv_inquiry() -
3866
* Process stat inquiry requests.
3870
pgstat_recv_inquiry(PgStat_MsgInquiry *msg, int len)
3872
if (msg->inquiry_time > last_statrequest)
3873
last_statrequest = msg->inquiry_time;
3878
* pgstat_recv_tabstat() -
3880
* Count what the backend has done.
3884
pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len)
3886
PgStat_StatDBEntry *dbentry;
3887
PgStat_StatTabEntry *tabentry;
3891
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
3894
* Update database-wide stats.
3896
dbentry->n_xact_commit += (PgStat_Counter) (msg->m_xact_commit);
3897
dbentry->n_xact_rollback += (PgStat_Counter) (msg->m_xact_rollback);
3900
* Process all table entries in the message.
3902
for (i = 0; i < msg->m_nentries; i++)
3904
PgStat_TableEntry *tabmsg = &(msg->m_entry[i]);
3906
tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
3907
(void *) &(tabmsg->t_id),
3908
HASH_ENTER, &found);
3913
* If it's a new table entry, initialize counters to the values we
3916
tabentry->numscans = tabmsg->t_counts.t_numscans;
3917
tabentry->tuples_returned = tabmsg->t_counts.t_tuples_returned;
3918
tabentry->tuples_fetched = tabmsg->t_counts.t_tuples_fetched;
3919
tabentry->tuples_inserted = tabmsg->t_counts.t_tuples_inserted;
3920
tabentry->tuples_updated = tabmsg->t_counts.t_tuples_updated;
3921
tabentry->tuples_deleted = tabmsg->t_counts.t_tuples_deleted;
3922
tabentry->tuples_hot_updated = tabmsg->t_counts.t_tuples_hot_updated;
3923
tabentry->n_live_tuples = tabmsg->t_counts.t_delta_live_tuples;
3924
tabentry->n_dead_tuples = tabmsg->t_counts.t_delta_dead_tuples;
3925
tabentry->changes_since_analyze = tabmsg->t_counts.t_changed_tuples;
3926
tabentry->blocks_fetched = tabmsg->t_counts.t_blocks_fetched;
3927
tabentry->blocks_hit = tabmsg->t_counts.t_blocks_hit;
3929
tabentry->vacuum_timestamp = 0;
3930
tabentry->vacuum_count = 0;
3931
tabentry->autovac_vacuum_timestamp = 0;
3932
tabentry->autovac_vacuum_count = 0;
3933
tabentry->analyze_timestamp = 0;
3934
tabentry->analyze_count = 0;
3935
tabentry->autovac_analyze_timestamp = 0;
3936
tabentry->autovac_analyze_count = 0;
3941
* Otherwise add the values to the existing entry.
3943
tabentry->numscans += tabmsg->t_counts.t_numscans;
3944
tabentry->tuples_returned += tabmsg->t_counts.t_tuples_returned;
3945
tabentry->tuples_fetched += tabmsg->t_counts.t_tuples_fetched;
3946
tabentry->tuples_inserted += tabmsg->t_counts.t_tuples_inserted;
3947
tabentry->tuples_updated += tabmsg->t_counts.t_tuples_updated;
3948
tabentry->tuples_deleted += tabmsg->t_counts.t_tuples_deleted;
3949
tabentry->tuples_hot_updated += tabmsg->t_counts.t_tuples_hot_updated;
3950
tabentry->n_live_tuples += tabmsg->t_counts.t_delta_live_tuples;
3951
tabentry->n_dead_tuples += tabmsg->t_counts.t_delta_dead_tuples;
3952
tabentry->changes_since_analyze += tabmsg->t_counts.t_changed_tuples;
3953
tabentry->blocks_fetched += tabmsg->t_counts.t_blocks_fetched;
3954
tabentry->blocks_hit += tabmsg->t_counts.t_blocks_hit;
3957
/* Clamp n_live_tuples in case of negative delta_live_tuples */
3958
tabentry->n_live_tuples = Max(tabentry->n_live_tuples, 0);
3959
/* Likewise for n_dead_tuples */
3960
tabentry->n_dead_tuples = Max(tabentry->n_dead_tuples, 0);
3963
* Add per-table stats to the per-database entry, too.
3965
dbentry->n_tuples_returned += tabmsg->t_counts.t_tuples_returned;
3966
dbentry->n_tuples_fetched += tabmsg->t_counts.t_tuples_fetched;
3967
dbentry->n_tuples_inserted += tabmsg->t_counts.t_tuples_inserted;
3968
dbentry->n_tuples_updated += tabmsg->t_counts.t_tuples_updated;
3969
dbentry->n_tuples_deleted += tabmsg->t_counts.t_tuples_deleted;
3970
dbentry->n_blocks_fetched += tabmsg->t_counts.t_blocks_fetched;
3971
dbentry->n_blocks_hit += tabmsg->t_counts.t_blocks_hit;
3977
* pgstat_recv_tabpurge() -
3979
* Arrange for dead table removal.
3983
pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len)
3985
PgStat_StatDBEntry *dbentry;
3988
dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
3991
* No need to purge if we don't even know the database.
3993
if (!dbentry || !dbentry->tables)
3997
* Process all table entries in the message.
3999
for (i = 0; i < msg->m_nentries; i++)
4001
/* Remove from hashtable if present; we don't care if it's not. */
4002
(void) hash_search(dbentry->tables,
4003
(void *) &(msg->m_tableid[i]),
4010
* pgstat_recv_dropdb() -
4012
* Arrange for dead database removal
4016
pgstat_recv_dropdb(PgStat_MsgDropdb *msg, int len)
4018
PgStat_StatDBEntry *dbentry;
4021
* Lookup the database in the hashtable.
4023
dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
4026
* If found, remove it.
4030
if (dbentry->tables != NULL)
4031
hash_destroy(dbentry->tables);
4032
if (dbentry->functions != NULL)
4033
hash_destroy(dbentry->functions);
4035
if (hash_search(pgStatDBHash,
4036
(void *) &(dbentry->databaseid),
4037
HASH_REMOVE, NULL) == NULL)
4039
(errmsg("database hash table corrupted "
4040
"during cleanup --- abort")));
4046
* pgstat_recv_resetcounter() -
4048
* Reset the statistics for the specified database.
4052
pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len)
4055
PgStat_StatDBEntry *dbentry;
4058
* Lookup the database in the hashtable. Nothing to do if not there.
4060
dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
4066
* We simply throw away all the database's table entries by recreating a
4067
* new hash table for them.
4069
if (dbentry->tables != NULL)
4070
hash_destroy(dbentry->tables);
4071
if (dbentry->functions != NULL)
4072
hash_destroy(dbentry->functions);
4074
dbentry->tables = NULL;
4075
dbentry->functions = NULL;
4078
* Reset database-level stats too. This should match the initialization
4079
* code in pgstat_get_db_entry().
4081
dbentry->n_xact_commit = 0;
4082
dbentry->n_xact_rollback = 0;
4083
dbentry->n_blocks_fetched = 0;
4084
dbentry->n_blocks_hit = 0;
4085
dbentry->n_tuples_returned = 0;
4086
dbentry->n_tuples_fetched = 0;
4087
dbentry->n_tuples_inserted = 0;
4088
dbentry->n_tuples_updated = 0;
4089
dbentry->n_tuples_deleted = 0;
4090
dbentry->last_autovac_time = 0;
4092
dbentry->stat_reset_timestamp = GetCurrentTimestamp();
4094
memset(&hash_ctl, 0, sizeof(hash_ctl));
4095
hash_ctl.keysize = sizeof(Oid);
4096
hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
4097
hash_ctl.hash = oid_hash;
4098
dbentry->tables = hash_create("Per-database table",
4099
PGSTAT_TAB_HASH_SIZE,
4101
HASH_ELEM | HASH_FUNCTION);
4103
hash_ctl.keysize = sizeof(Oid);
4104
hash_ctl.entrysize = sizeof(PgStat_StatFuncEntry);
4105
hash_ctl.hash = oid_hash;
4106
dbentry->functions = hash_create("Per-database function",
4107
PGSTAT_FUNCTION_HASH_SIZE,
4109
HASH_ELEM | HASH_FUNCTION);
4113
* pgstat_recv_resetshared() -
4115
* Reset some shared statistics of the cluster.
4119
pgstat_recv_resetsharedcounter(PgStat_MsgResetsharedcounter *msg, int len)
4121
if (msg->m_resettarget == RESET_BGWRITER)
4123
/* Reset the global background writer statistics for the cluster. */
4124
memset(&globalStats, 0, sizeof(globalStats));
4125
globalStats.stat_reset_timestamp = GetCurrentTimestamp();
4129
* Presumably the sender of this message validated the target, don't
4130
* complain here if it's not valid
4135
* pgstat_recv_resetsinglecounter() -
4137
* Reset a statistics for a single object
4141
pgstat_recv_resetsinglecounter(PgStat_MsgResetsinglecounter *msg, int len)
4143
PgStat_StatDBEntry *dbentry;
4145
dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
4150
/* Set the reset timestamp for the whole database */
4151
dbentry->stat_reset_timestamp = GetCurrentTimestamp();
4153
/* Remove object if it exists, ignore it if not */
4154
if (msg->m_resettype == RESET_TABLE)
4155
(void) hash_search(dbentry->tables, (void *) &(msg->m_objectid),
4157
else if (msg->m_resettype == RESET_FUNCTION)
4158
(void) hash_search(dbentry->functions, (void *) &(msg->m_objectid),
4163
* pgstat_recv_autovac() -
4165
* Process an autovacuum signalling message.
4169
pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len)
4171
PgStat_StatDBEntry *dbentry;
4174
* Store the last autovacuum time in the database's hashtable entry.
4176
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
4178
dbentry->last_autovac_time = msg->m_start_time;
4182
* pgstat_recv_vacuum() -
4184
* Process a VACUUM message.
4188
pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len)
4190
PgStat_StatDBEntry *dbentry;
4191
PgStat_StatTabEntry *tabentry;
4194
* Store the data in the table's hashtable entry.
4196
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
4198
tabentry = pgstat_get_tab_entry(dbentry, msg->m_tableoid, true);
4200
if (msg->m_adopt_counts)
4201
tabentry->n_live_tuples = msg->m_tuples;
4202
/* Resetting dead_tuples to 0 is an approximation ... */
4203
tabentry->n_dead_tuples = 0;
4205
if (msg->m_autovacuum)
4207
tabentry->autovac_vacuum_timestamp = msg->m_vacuumtime;
4208
tabentry->autovac_vacuum_count++;
4212
tabentry->vacuum_timestamp = msg->m_vacuumtime;
4213
tabentry->vacuum_count++;
4218
* pgstat_recv_analyze() -
4220
* Process an ANALYZE message.
4224
pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len)
4226
PgStat_StatDBEntry *dbentry;
4227
PgStat_StatTabEntry *tabentry;
4230
* Store the data in the table's hashtable entry.
4232
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
4234
tabentry = pgstat_get_tab_entry(dbentry, msg->m_tableoid, true);
4236
if (msg->m_adopt_counts)
4238
tabentry->n_live_tuples = msg->m_live_tuples;
4239
tabentry->n_dead_tuples = msg->m_dead_tuples;
4243
* We reset changes_since_analyze to zero, forgetting any changes that
4244
* occurred while the ANALYZE was in progress.
4246
tabentry->changes_since_analyze = 0;
4248
if (msg->m_autovacuum)
4250
tabentry->autovac_analyze_timestamp = msg->m_analyzetime;
4251
tabentry->autovac_analyze_count++;
4255
tabentry->analyze_timestamp = msg->m_analyzetime;
4256
tabentry->analyze_count++;
4262
* pgstat_recv_bgwriter() -
4264
* Process a BGWRITER message.
4268
pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len)
4270
globalStats.timed_checkpoints += msg->m_timed_checkpoints;
4271
globalStats.requested_checkpoints += msg->m_requested_checkpoints;
4272
globalStats.buf_written_checkpoints += msg->m_buf_written_checkpoints;
4273
globalStats.buf_written_clean += msg->m_buf_written_clean;
4274
globalStats.maxwritten_clean += msg->m_maxwritten_clean;
4275
globalStats.buf_written_backend += msg->m_buf_written_backend;
4276
globalStats.buf_fsync_backend += msg->m_buf_fsync_backend;
4277
globalStats.buf_alloc += msg->m_buf_alloc;
4281
* pgstat_recv_recoveryconflict() -
4283
* Process as RECOVERYCONFLICT message.
4287
pgstat_recv_recoveryconflict(PgStat_MsgRecoveryConflict *msg, int len)
4289
PgStat_StatDBEntry *dbentry;
4291
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
4293
switch (msg->m_reason)
4295
case PROCSIG_RECOVERY_CONFLICT_DATABASE:
4298
* Since we drop the information about the database as soon as it
4299
* replicates, there is no point in counting these conflicts.
4302
case PROCSIG_RECOVERY_CONFLICT_TABLESPACE:
4303
dbentry->n_conflict_tablespace++;
4305
case PROCSIG_RECOVERY_CONFLICT_LOCK:
4306
dbentry->n_conflict_lock++;
4308
case PROCSIG_RECOVERY_CONFLICT_SNAPSHOT:
4309
dbentry->n_conflict_snapshot++;
4311
case PROCSIG_RECOVERY_CONFLICT_BUFFERPIN:
4312
dbentry->n_conflict_bufferpin++;
4314
case PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK:
4315
dbentry->n_conflict_startup_deadlock++;
4321
* pgstat_recv_funcstat() -
4323
* Count what the backend has done.
4327
pgstat_recv_funcstat(PgStat_MsgFuncstat *msg, int len)
4329
PgStat_FunctionEntry *funcmsg = &(msg->m_entry[0]);
4330
PgStat_StatDBEntry *dbentry;
4331
PgStat_StatFuncEntry *funcentry;
4335
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
4338
* Process all function entries in the message.
4340
for (i = 0; i < msg->m_nentries; i++, funcmsg++)
4342
funcentry = (PgStat_StatFuncEntry *) hash_search(dbentry->functions,
4343
(void *) &(funcmsg->f_id),
4344
HASH_ENTER, &found);
4349
* If it's a new function entry, initialize counters to the values
4352
funcentry->f_numcalls = funcmsg->f_numcalls;
4353
funcentry->f_time = funcmsg->f_time;
4354
funcentry->f_time_self = funcmsg->f_time_self;
4359
* Otherwise add the values to the existing entry.
4361
funcentry->f_numcalls += funcmsg->f_numcalls;
4362
funcentry->f_time += funcmsg->f_time;
4363
funcentry->f_time_self += funcmsg->f_time_self;
4369
* pgstat_recv_funcpurge() -
4371
* Arrange for dead function removal.
4375
pgstat_recv_funcpurge(PgStat_MsgFuncpurge *msg, int len)
4377
PgStat_StatDBEntry *dbentry;
4380
dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
4383
* No need to purge if we don't even know the database.
4385
if (!dbentry || !dbentry->functions)
4389
* Process all function entries in the message.
4391
for (i = 0; i < msg->m_nentries; i++)
4393
/* Remove from hashtable if present; we don't care if it's not. */
4394
(void) hash_search(dbentry->functions,
4395
(void *) &(msg->m_functionid[i]),
added
removed
src/backend/postmaster/pgstat.c
