PostgreSQL Source Code  git master
pgstat.c File Reference
#include "postgres.h"
#include <unistd.h>
#include "access/transam.h"
#include "access/xact.h"
#include "lib/dshash.h"
#include "pgstat.h"
#include "port/atomics.h"
#include "storage/fd.h"
#include "storage/ipc.h"
#include "storage/lwlock.h"
#include "storage/pg_shmem.h"
#include "storage/shmem.h"
#include "utils/guc.h"
#include "utils/memutils.h"
#include "utils/pgstat_internal.h"
#include "utils/timestamp.h"
#include "lib/simplehash.h"
Include dependency graph for pgstat.c:

Go to the source code of this file.

Data Structures

struct  PgStat_SnapshotEntry
 

Macros

#define PGSTAT_MIN_INTERVAL   1000
 
#define PGSTAT_MAX_INTERVAL   60000
 
#define PGSTAT_IDLE_INTERVAL   10000
 
#define PGSTAT_SNAPSHOT_HASH_SIZE   512
 
#define SH_PREFIX   pgstat_snapshot
 
#define SH_ELEMENT_TYPE   PgStat_SnapshotEntry
 
#define SH_KEY_TYPE   PgStat_HashKey
 
#define SH_KEY   key
 
#define SH_HASH_KEY(tb, key)    pgstat_hash_hash_key(&key, sizeof(PgStat_HashKey), NULL)
 
#define SH_EQUAL(tb, a, b)    pgstat_cmp_hash_key(&a, &b, sizeof(PgStat_HashKey), NULL) == 0
 
#define SH_SCOPE   static inline
 
#define SH_DEFINE
 
#define SH_DECLARE
 
#define write_chunk_s(fpout, ptr)   write_chunk(fpout, ptr, sizeof(*ptr))
 
#define read_chunk_s(fpin, ptr)   read_chunk(fpin, ptr, sizeof(*ptr))
 

Typedefs

typedef struct PgStat_SnapshotEntry PgStat_SnapshotEntry
 

Functions

static void pgstat_write_statsfile (void)
 
static void pgstat_read_statsfile (void)
 
static void pgstat_reset_after_failure (void)
 
static bool pgstat_flush_pending_entries (bool nowait)
 
static void pgstat_prep_snapshot (void)
 
static void pgstat_build_snapshot (void)
 
static void pgstat_build_snapshot_fixed (PgStat_Kind kind)
 
static bool pgstat_is_kind_valid (int ikind)
 
void pgstat_restore_stats (void)
 
void pgstat_discard_stats (void)
 
void pgstat_before_server_shutdown (int code, Datum arg)
 
static void pgstat_shutdown_hook (int code, Datum arg)
 
void pgstat_initialize (void)
 
long pgstat_report_stat (bool force)
 
void pgstat_force_next_flush (void)
 
static bool match_db_entries (PgStatShared_HashEntry *entry, Datum match_data)
 
void pgstat_reset_counters (void)
 
void pgstat_reset (PgStat_Kind kind, Oid dboid, Oid objoid)
 
void pgstat_reset_of_kind (PgStat_Kind kind)
 
void pgstat_clear_snapshot (void)
 
void * pgstat_fetch_entry (PgStat_Kind kind, Oid dboid, Oid objoid)
 
TimestampTz pgstat_get_stat_snapshot_timestamp (bool *have_snapshot)
 
bool pgstat_have_entry (PgStat_Kind kind, Oid dboid, Oid objoid)
 
void pgstat_snapshot_fixed (PgStat_Kind kind)
 
PgStat_EntryRefpgstat_prep_pending_entry (PgStat_Kind kind, Oid dboid, Oid objoid, bool *created_entry)
 
PgStat_EntryRefpgstat_fetch_pending_entry (PgStat_Kind kind, Oid dboid, Oid objoid)
 
void pgstat_delete_pending_entry (PgStat_EntryRef *entry_ref)
 
PgStat_Kind pgstat_get_kind_from_str (char *kind_str)
 
const PgStat_KindInfopgstat_get_kind_info (PgStat_Kind kind)
 
static void write_chunk (FILE *fpout, void *ptr, size_t len)
 
static bool read_chunk (FILE *fpin, void *ptr, size_t len)
 

Variables

bool pgstat_track_counts = false
 
int pgstat_fetch_consistency = PGSTAT_FETCH_CONSISTENCY_NONE
 
PgStat_LocalState pgStatLocal
 
static MemoryContext pgStatPendingContext = NULL
 
static dlist_head pgStatPending = DLIST_STATIC_INIT(pgStatPending)
 
static bool pgStatForceNextFlush = false
 
static const PgStat_KindInfo pgstat_kind_infos [PGSTAT_NUM_KINDS]
 

Macro Definition Documentation

◆ PGSTAT_IDLE_INTERVAL

#define PGSTAT_IDLE_INTERVAL   10000

Definition at line 122 of file pgstat.c.

◆ PGSTAT_MAX_INTERVAL

#define PGSTAT_MAX_INTERVAL   60000

Definition at line 120 of file pgstat.c.

◆ PGSTAT_MIN_INTERVAL

#define PGSTAT_MIN_INTERVAL   1000

Definition at line 118 of file pgstat.c.

◆ PGSTAT_SNAPSHOT_HASH_SIZE

#define PGSTAT_SNAPSHOT_HASH_SIZE   512

Definition at line 129 of file pgstat.c.

◆ read_chunk_s

#define read_chunk_s (   fpin,
  ptr 
)    read_chunk(fpin, ptr, sizeof(*ptr))

Definition at line 1415 of file pgstat.c.

◆ SH_DECLARE

#define SH_DECLARE

Definition at line 157 of file pgstat.c.

◆ SH_DEFINE

#define SH_DEFINE

Definition at line 156 of file pgstat.c.

◆ SH_ELEMENT_TYPE

#define SH_ELEMENT_TYPE   PgStat_SnapshotEntry

Definition at line 148 of file pgstat.c.

◆ SH_EQUAL

#define SH_EQUAL (   tb,
  a,
  b 
)     pgstat_cmp_hash_key(&a, &b, sizeof(PgStat_HashKey), NULL) == 0

Definition at line 153 of file pgstat.c.

◆ SH_HASH_KEY

#define SH_HASH_KEY (   tb,
  key 
)     pgstat_hash_hash_key(&key, sizeof(PgStat_HashKey), NULL)

Definition at line 151 of file pgstat.c.

◆ SH_KEY

#define SH_KEY   key

Definition at line 150 of file pgstat.c.

◆ SH_KEY_TYPE

#define SH_KEY_TYPE   PgStat_HashKey

Definition at line 149 of file pgstat.c.

◆ SH_PREFIX

#define SH_PREFIX   pgstat_snapshot

Definition at line 147 of file pgstat.c.

◆ SH_SCOPE

#define SH_SCOPE   static inline

Definition at line 155 of file pgstat.c.

◆ write_chunk_s

#define write_chunk_s (   fpout,
  ptr 
)    write_chunk(fpout, ptr, sizeof(*ptr))

Definition at line 1248 of file pgstat.c.

Typedef Documentation

◆ PgStat_SnapshotEntry

Function Documentation

◆ match_db_entries()

static bool match_db_entries ( PgStatShared_HashEntry entry,
Datum  match_data 
)
static

Definition at line 673 of file pgstat.c.

674 {
675  return entry->key.dboid == DatumGetObjectId(MyDatabaseId);
676 }
Oid MyDatabaseId
Definition: globals.c:89
#define DatumGetObjectId(X)
Definition: postgres.h:544

References DatumGetObjectId, PgStat_HashKey::dboid, PgStatShared_HashEntry::key, and MyDatabaseId.

Referenced by pgstat_reset_counters().

◆ pgstat_before_server_shutdown()

void pgstat_before_server_shutdown ( int  code,
Datum  arg 
)

Definition at line 447 of file pgstat.c.

448 {
449  Assert(pgStatLocal.shmem != NULL);
451 
452  /*
453  * Stats should only be reported after pgstat_initialize() and before
454  * pgstat_shutdown(). This is a convenient point to catch most violations
455  * of this rule.
456  */
457  Assert(pgstat_is_initialized && !pgstat_is_shutdown);
458 
459  /* flush out our own pending changes before writing out */
460  pgstat_report_stat(true);
461 
462  /*
463  * Only write out file during normal shutdown. Don't even signal that
464  * we've shutdown during irregular shutdowns, because the shutdown
465  * sequence isn't coordinated to ensure this backend shuts down last.
466  */
467  if (code == 0)
468  {
469  pgStatLocal.shmem->is_shutdown = true;
471  }
472 }
Assert(fmt[strlen(fmt) - 1] !='\n')
static void pgstat_write_statsfile(void)
Definition: pgstat.c:1255
long pgstat_report_stat(bool force)
Definition: pgstat.c:564
PgStat_LocalState pgStatLocal
Definition: pgstat.c:194
PgStat_ShmemControl * shmem

References Assert(), PgStat_ShmemControl::is_shutdown, pgstat_report_stat(), pgstat_write_statsfile(), pgStatLocal, and PgStat_LocalState::shmem.

Referenced by CheckpointerMain(), and InitPostgres().

◆ pgstat_build_snapshot()

static void pgstat_build_snapshot ( void  )
static

Definition at line 930 of file pgstat.c.

931 {
932  dshash_seq_status hstat;
934 
935  /* should only be called when we need a snapshot */
937 
938  /* snapshot already built */
940  return;
941 
943 
944  Assert(pgStatLocal.snapshot.stats->members == 0);
945 
947 
948  /*
949  * Snapshot all variable stats.
950  */
951  dshash_seq_init(&hstat, pgStatLocal.shared_hash, false);
952  while ((p = dshash_seq_next(&hstat)) != NULL)
953  {
954  PgStat_Kind kind = p->key.kind;
955  const PgStat_KindInfo *kind_info = pgstat_get_kind_info(kind);
956  bool found;
957  PgStat_SnapshotEntry *entry;
958  PgStatShared_Common *stats_data;
959 
960  /*
961  * Check if the stats object should be included in the snapshot.
962  * Unless the stats kind can be accessed from all databases (e.g.,
963  * database stats themselves), we only include stats for the current
964  * database or objects not associated with a database (e.g. shared
965  * relations).
966  */
967  if (p->key.dboid != MyDatabaseId &&
968  p->key.dboid != InvalidOid &&
969  !kind_info->accessed_across_databases)
970  continue;
971 
972  if (p->dropped)
973  continue;
974 
976 
977  stats_data = dsa_get_address(pgStatLocal.dsa, p->body);
978  Assert(stats_data);
979 
980  entry = pgstat_snapshot_insert(pgStatLocal.snapshot.stats, p->key, &found);
981  Assert(!found);
982 
984  kind_info->shared_size);
985  memcpy(entry->data,
986  pgstat_get_entry_data(kind, stats_data),
987  kind_info->shared_size);
988  }
989  dshash_seq_term(&hstat);
990 
991  /*
992  * Build snapshot of all fixed-numbered stats.
993  */
994  for (int kind = PGSTAT_KIND_FIRST_VALID; kind <= PGSTAT_KIND_LAST; kind++)
995  {
996  const PgStat_KindInfo *kind_info = pgstat_get_kind_info(kind);
997 
998  if (!kind_info->fixed_amount)
999  {
1000  Assert(kind_info->snapshot_cb == NULL);
1001  continue;
1002  }
1003 
1005  }
1006 
1008 }
static uint32 pg_atomic_read_u32(volatile pg_atomic_uint32 *ptr)
Definition: atomics.h:241
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1574
void * dsa_get_address(dsa_area *area, dsa_pointer dp)
Definition: dsa.c:932
void dshash_seq_init(dshash_seq_status *status, dshash_table *hash_table, bool exclusive)
Definition: dshash.c:612
void dshash_seq_term(dshash_seq_status *status)
Definition: dshash.c:723
void * dshash_seq_next(dshash_seq_status *status)
Definition: dshash.c:631
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:863
int pgstat_fetch_consistency
Definition: pgstat.c:186
const PgStat_KindInfo * pgstat_get_kind_info(PgStat_Kind kind)
Definition: pgstat.c:1210
static void pgstat_prep_snapshot(void)
Definition: pgstat.c:912
static void pgstat_build_snapshot_fixed(PgStat_Kind kind)
Definition: pgstat.c:1011
PgStat_Kind
Definition: pgstat.h:36
@ PGSTAT_FETCH_CONSISTENCY_SNAPSHOT
Definition: pgstat.h:71
#define PGSTAT_KIND_LAST
Definition: pgstat.h:56
#define PGSTAT_KIND_FIRST_VALID
Definition: pgstat.h:55
static void * pgstat_get_entry_data(PgStat_Kind kind, PgStatShared_Common *entry)
#define InvalidOid
Definition: postgres_ext.h:36
pg_atomic_uint32 refcount
PgStat_Kind kind
bool accessed_across_databases
void(* snapshot_cb)(void)
PgStat_Snapshot snapshot
dshash_table * shared_hash
TimestampTz snapshot_timestamp
MemoryContext context
PgStat_FetchConsistency mode
struct pgstat_snapshot_hash * stats

References PgStat_KindInfo::accessed_across_databases, Assert(), PgStatShared_HashEntry::body, PgStat_Snapshot::context, PgStat_SnapshotEntry::data, PgStat_HashKey::dboid, PgStatShared_HashEntry::dropped, PgStat_LocalState::dsa, dsa_get_address(), dshash_seq_init(), dshash_seq_next(), dshash_seq_term(), PgStat_KindInfo::fixed_amount, GetCurrentTimestamp(), InvalidOid, PgStatShared_HashEntry::key, PgStat_HashKey::kind, MemoryContextAlloc(), PgStat_Snapshot::mode, MyDatabaseId, pg_atomic_read_u32(), pgstat_build_snapshot_fixed(), pgstat_fetch_consistency, PGSTAT_FETCH_CONSISTENCY_SNAPSHOT, pgstat_get_entry_data(), pgstat_get_kind_info(), PGSTAT_KIND_FIRST_VALID, PGSTAT_KIND_LAST, pgstat_prep_snapshot(), pgStatLocal, PgStatShared_HashEntry::refcount, PgStat_LocalState::shared_hash, PgStat_KindInfo::shared_size, PgStat_LocalState::snapshot, PgStat_KindInfo::snapshot_cb, PgStat_Snapshot::snapshot_timestamp, and PgStat_Snapshot::stats.

Referenced by pgstat_fetch_entry(), and pgstat_snapshot_fixed().

◆ pgstat_build_snapshot_fixed()

static void pgstat_build_snapshot_fixed ( PgStat_Kind  kind)
static

Definition at line 1011 of file pgstat.c.

1012 {
1013  const PgStat_KindInfo *kind_info = pgstat_get_kind_info(kind);
1014 
1015  Assert(kind_info->fixed_amount);
1016  Assert(kind_info->snapshot_cb != NULL);
1017 
1019  {
1020  /* rebuild every time */
1021  pgStatLocal.snapshot.fixed_valid[kind] = false;
1022  }
1023  else if (pgStatLocal.snapshot.fixed_valid[kind])
1024  {
1025  /* in snapshot mode we shouldn't get called again */
1027  return;
1028  }
1029 
1031 
1032  kind_info->snapshot_cb();
1033 
1035  pgStatLocal.snapshot.fixed_valid[kind] = true;
1036 }
@ PGSTAT_FETCH_CONSISTENCY_NONE
Definition: pgstat.h:69
@ PGSTAT_FETCH_CONSISTENCY_CACHE
Definition: pgstat.h:70
bool fixed_valid[PGSTAT_NUM_KINDS]

References Assert(), PgStat_KindInfo::fixed_amount, PgStat_Snapshot::fixed_valid, pgstat_fetch_consistency, PGSTAT_FETCH_CONSISTENCY_CACHE, PGSTAT_FETCH_CONSISTENCY_NONE, pgstat_get_kind_info(), pgStatLocal, PgStat_LocalState::snapshot, and PgStat_KindInfo::snapshot_cb.

Referenced by pgstat_build_snapshot(), pgstat_snapshot_fixed(), and pgstat_write_statsfile().

◆ pgstat_clear_snapshot()

void pgstat_clear_snapshot ( void  )

Definition at line 751 of file pgstat.c.

752 {
754 
755  memset(&pgStatLocal.snapshot.fixed_valid, 0,
757  pgStatLocal.snapshot.stats = NULL;
759 
760  /* Release memory, if any was allocated */
762  {
764 
765  /* Reset variables */
767  }
768 
769  /*
770  * Historically the backend_status.c facilities lived in this file, and
771  * were reset with the same function. For now keep it that way, and
772  * forward the reset request.
773  */
775 }
void pgstat_clear_backend_activity_snapshot(void)
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:218
#define pgstat_assert_is_up()

References PgStat_Snapshot::context, PgStat_Snapshot::fixed_valid, MemoryContextDelete(), PgStat_Snapshot::mode, pgstat_assert_is_up, pgstat_clear_backend_activity_snapshot(), PGSTAT_FETCH_CONSISTENCY_NONE, pgStatLocal, PgStat_LocalState::snapshot, and PgStat_Snapshot::stats.

Referenced by AtEOXact_PgStat(), pg_stat_clear_snapshot(), and PostPrepare_PgStat().

◆ pgstat_delete_pending_entry()

void pgstat_delete_pending_entry ( PgStat_EntryRef entry_ref)

Definition at line 1103 of file pgstat.c.

1104 {
1105  PgStat_Kind kind = entry_ref->shared_entry->key.kind;
1106  const PgStat_KindInfo *kind_info = pgstat_get_kind_info(kind);
1107  void *pending_data = entry_ref->pending;
1108 
1109  Assert(pending_data != NULL);
1110  /* !fixed_amount stats should be handled explicitly */
1111  Assert(!pgstat_get_kind_info(kind)->fixed_amount);
1112 
1113  if (kind_info->delete_pending_cb)
1114  kind_info->delete_pending_cb(entry_ref);
1115 
1116  pfree(pending_data);
1117  entry_ref->pending = NULL;
1118 
1119  dlist_delete(&entry_ref->pending_node);
1120 }
static void dlist_delete(dlist_node *node)
Definition: ilist.h:358
void pfree(void *pointer)
Definition: mcxt.c:1175
PgStatShared_HashEntry * shared_entry
dlist_node pending_node
void(* delete_pending_cb)(PgStat_EntryRef *sr)

References Assert(), PgStat_KindInfo::delete_pending_cb, dlist_delete(), PgStatShared_HashEntry::key, PgStat_HashKey::kind, PgStat_EntryRef::pending, PgStat_EntryRef::pending_node, pfree(), pgstat_get_kind_info(), and PgStat_EntryRef::shared_entry.

Referenced by pgstat_flush_pending_entries(), and pgstat_release_entry_ref().

◆ pgstat_discard_stats()

void pgstat_discard_stats ( void  )

Definition at line 404 of file pgstat.c.

405 {
406  int ret;
407 
408  /* NB: this needs to be done even in single user mode */
409 
410  ret = unlink(PGSTAT_STAT_PERMANENT_FILENAME);
411  if (ret != 0)
412  {
413  if (errno == ENOENT)
414  elog(DEBUG2,
415  "didn't need to unlink permanent stats file \"%s\" - didn't exist",
417  else
418  ereport(LOG,
420  errmsg("could not unlink permanent statistics file \"%s\": %m",
422  }
423  else
424  {
425  ereport(DEBUG2,
427  errmsg("unlinked permanent statistics file \"%s\"",
429  }
430 
431  /*
432  * Reset stats contents. This will set reset timestamps of fixed-numbered
433  * stats to the current time (no variable stats exist).
434  */
436 }
int errcode_for_file_access(void)
Definition: elog.c:716
int errmsg(const char *fmt,...)
Definition: elog.c:904
#define LOG
Definition: elog.h:25
#define DEBUG2
Definition: elog.h:23
#define elog(elevel,...)
Definition: elog.h:218
#define ereport(elevel,...)
Definition: elog.h:143
static void pgstat_reset_after_failure(void)
Definition: pgstat.c:1619
#define PGSTAT_STAT_PERMANENT_FILENAME
Definition: pgstat.h:28

References DEBUG2, elog, ereport, errcode_for_file_access(), errmsg(), LOG, pgstat_reset_after_failure(), and PGSTAT_STAT_PERMANENT_FILENAME.

Referenced by StartupXLOG().

◆ pgstat_fetch_entry()

void* pgstat_fetch_entry ( PgStat_Kind  kind,
Oid  dboid,
Oid  objoid 
)

Definition at line 778 of file pgstat.c.

779 {
781  PgStat_EntryRef *entry_ref;
782  void *stats_data;
783  const PgStat_KindInfo *kind_info = pgstat_get_kind_info(kind);
784 
785  /* should be called from backends */
787  AssertArg(!kind_info->fixed_amount);
788 
790 
791  key.kind = kind;
792  key.dboid = dboid;
793  key.objoid = objoid;
794 
795  /* if we need to build a full snapshot, do so */
798 
799  /* if caching is desired, look up in cache */
801  {
802  PgStat_SnapshotEntry *entry = NULL;
803 
804  entry = pgstat_snapshot_lookup(pgStatLocal.snapshot.stats, key);
805 
806  if (entry)
807  return entry->data;
808 
809  /*
810  * If we built a full snapshot and the key is not in
811  * pgStatLocal.snapshot.stats, there are no matching stats.
812  */
814  return NULL;
815  }
816 
818 
819  entry_ref = pgstat_get_entry_ref(kind, dboid, objoid, false, NULL);
820 
821  if (entry_ref == NULL || entry_ref->shared_entry->dropped)
822  {
823  /* create empty entry when using PGSTAT_FETCH_CONSISTENCY_CACHE */
825  {
826  PgStat_SnapshotEntry *entry = NULL;
827  bool found;
828 
829  entry = pgstat_snapshot_insert(pgStatLocal.snapshot.stats, key, &found);
830  Assert(!found);
831  entry->data = NULL;
832  }
833  return NULL;
834  }
835 
836  /*
837  * Allocate in caller's context for PGSTAT_FETCH_CONSISTENCY_NONE,
838  * otherwise we could quickly end up with a fair bit of memory used due to
839  * repeated accesses.
840  */
842  stats_data = palloc(kind_info->shared_data_len);
843  else
845  kind_info->shared_data_len);
846  memcpy(stats_data,
847  pgstat_get_entry_data(kind, entry_ref->shared_stats),
848  kind_info->shared_data_len);
849 
851  {
852  PgStat_SnapshotEntry *entry = NULL;
853  bool found;
854 
855  entry = pgstat_snapshot_insert(pgStatLocal.snapshot.stats, key, &found);
856  entry->data = stats_data;
857  }
858 
859  return stats_data;
860 }
#define AssertArg(condition)
Definition: c.h:806
bool IsUnderPostmaster
Definition: globals.c:113
bool IsPostmasterEnvironment
Definition: globals.c:112
void * palloc(Size size)
Definition: mcxt.c:1068
static void pgstat_build_snapshot(void)
Definition: pgstat.c:930
PgStat_EntryRef * pgstat_get_entry_ref(PgStat_Kind kind, Oid dboid, Oid objoid, bool create, bool *created_entry)
Definition: pgstat_shmem.c:393
PgStatShared_Common * shared_stats

References Assert(), AssertArg, PgStat_Snapshot::context, PgStat_SnapshotEntry::data, PgStatShared_HashEntry::dropped, PgStat_KindInfo::fixed_amount, IsPostmasterEnvironment, IsUnderPostmaster, sort-test::key, MemoryContextAlloc(), PgStat_Snapshot::mode, palloc(), pgstat_build_snapshot(), pgstat_fetch_consistency, PGSTAT_FETCH_CONSISTENCY_CACHE, PGSTAT_FETCH_CONSISTENCY_NONE, PGSTAT_FETCH_CONSISTENCY_SNAPSHOT, pgstat_get_entry_data(), pgstat_get_entry_ref(), pgstat_get_kind_info(), pgstat_prep_snapshot(), pgStatLocal, PgStat_KindInfo::shared_data_len, PgStat_EntryRef::shared_entry, PgStat_EntryRef::shared_stats, PgStat_LocalState::snapshot, and PgStat_Snapshot::stats.

Referenced by pgstat_fetch_replslot(), pgstat_fetch_stat_dbentry(), pgstat_fetch_stat_funcentry(), pgstat_fetch_stat_subscription(), and pgstat_fetch_stat_tabentry_ext().

◆ pgstat_fetch_pending_entry()

PgStat_EntryRef* pgstat_fetch_pending_entry ( PgStat_Kind  kind,
Oid  dboid,
Oid  objoid 
)

Definition at line 1090 of file pgstat.c.

1091 {
1092  PgStat_EntryRef *entry_ref;
1093 
1094  entry_ref = pgstat_get_entry_ref(kind, dboid, objoid, false, NULL);
1095 
1096  if (entry_ref == NULL || entry_ref->pending == NULL)
1097  return NULL;
1098 
1099  return entry_ref;
1100 }

References PgStat_EntryRef::pending, and pgstat_get_entry_ref().

Referenced by find_funcstat_entry(), and find_tabstat_entry().

◆ pgstat_flush_pending_entries()

static bool pgstat_flush_pending_entries ( bool  nowait)
static

Definition at line 1127 of file pgstat.c.

1128 {
1129  bool have_pending = false;
1130  dlist_node *cur = NULL;
1131 
1132  /*
1133  * Need to be a bit careful iterating over the list of pending entries.
1134  * Processing a pending entry may queue further pending entries to the end
1135  * of the list that we want to process, so a simple iteration won't do.
1136  * Further complicating matters is that we want to delete the current
1137  * entry in each iteration from the list if we flushed successfully.
1138  *
1139  * So we just keep track of the next pointer in each loop iteration.
1140  */
1143 
1144  while (cur)
1145  {
1146  PgStat_EntryRef *entry_ref =
1147  dlist_container(PgStat_EntryRef, pending_node, cur);
1148  PgStat_HashKey key = entry_ref->shared_entry->key;
1149  PgStat_Kind kind = key.kind;
1150  const PgStat_KindInfo *kind_info = pgstat_get_kind_info(kind);
1151  bool did_flush;
1152  dlist_node *next;
1153 
1154  Assert(!kind_info->fixed_amount);
1155  Assert(kind_info->flush_pending_cb != NULL);
1156 
1157  /* flush the stats, if possible */
1158  did_flush = kind_info->flush_pending_cb(entry_ref, nowait);
1159 
1160  Assert(did_flush || nowait);
1161 
1162  /* determine next entry, before deleting the pending entry */
1165  else
1166  next = NULL;
1167 
1168  /* if successfully flushed, remove entry */
1169  if (did_flush)
1170  pgstat_delete_pending_entry(entry_ref);
1171  else
1172  have_pending = true;
1173 
1174  cur = next;
1175  }
1176 
1177  Assert(dlist_is_empty(&pgStatPending) == !have_pending);
1178 
1179  return have_pending;
1180 }
static int32 next
Definition: blutils.c:219
struct cursor * cur
Definition: ecpg.c:28
static bool dlist_is_empty(dlist_head *head)
Definition: ilist.h:289
static dlist_node * dlist_next_node(dlist_head *head, dlist_node *node)
Definition: ilist.h:440
static bool dlist_has_next(dlist_head *head, dlist_node *node)
Definition: ilist.h:421
static dlist_node * dlist_head_node(dlist_head *head)
Definition: ilist.h:468
#define dlist_container(type, membername, ptr)
Definition: ilist.h:496
void pgstat_delete_pending_entry(PgStat_EntryRef *entry_ref)
Definition: pgstat.c:1103
static dlist_head pgStatPending
Definition: pgstat.c:219
bool(* flush_pending_cb)(PgStat_EntryRef *sr, bool nowait)

References Assert(), cur, dlist_container, dlist_has_next(), dlist_head_node(), dlist_is_empty(), dlist_next_node(), PgStat_KindInfo::fixed_amount, PgStat_KindInfo::flush_pending_cb, PgStatShared_HashEntry::key, sort-test::key, next, pgstat_delete_pending_entry(), pgstat_get_kind_info(), pgStatPending, and PgStat_EntryRef::shared_entry.

Referenced by pgstat_report_stat().

◆ pgstat_force_next_flush()

void pgstat_force_next_flush ( void  )

Definition at line 664 of file pgstat.c.

665 {
666  pgStatForceNextFlush = true;
667 }
static bool pgStatForceNextFlush
Definition: pgstat.c:226

References pgStatForceNextFlush.

Referenced by pg_stat_force_next_flush().

◆ pgstat_get_kind_from_str()

PgStat_Kind pgstat_get_kind_from_str ( char *  kind_str)

Definition at line 1189 of file pgstat.c.

1190 {
1191  for (int kind = PGSTAT_KIND_FIRST_VALID; kind <= PGSTAT_KIND_LAST; kind++)
1192  {
1193  if (pg_strcasecmp(kind_str, pgstat_kind_infos[kind].name) == 0)
1194  return kind;
1195  }
1196 
1197  ereport(ERROR,
1198  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1199  errmsg("invalid statistics kind: \"%s\"", kind_str)));
1200  return PGSTAT_KIND_DATABASE; /* avoid compiler warnings */
1201 }
int errcode(int sqlerrcode)
Definition: elog.c:693
#define ERROR
Definition: elog.h:33
const char * name
Definition: encode.c:561
static const PgStat_KindInfo pgstat_kind_infos[PGSTAT_NUM_KINDS]
Definition: pgstat.c:251
@ PGSTAT_KIND_DATABASE
Definition: pgstat.h:41
int pg_strcasecmp(const char *s1, const char *s2)
Definition: pgstrcasecmp.c:36

References ereport, errcode(), errmsg(), ERROR, name, pg_strcasecmp(), PGSTAT_KIND_DATABASE, PGSTAT_KIND_FIRST_VALID, pgstat_kind_infos, and PGSTAT_KIND_LAST.

Referenced by pg_stat_have_stats().

◆ pgstat_get_kind_info()

◆ pgstat_get_stat_snapshot_timestamp()

TimestampTz pgstat_get_stat_snapshot_timestamp ( bool have_snapshot)

Definition at line 868 of file pgstat.c.

869 {
871  {
872  *have_snapshot = true;
874  }
875 
876  *have_snapshot = false;
877 
878  return 0;
879 }

References PgStat_Snapshot::mode, PGSTAT_FETCH_CONSISTENCY_SNAPSHOT, pgStatLocal, PgStat_LocalState::snapshot, and PgStat_Snapshot::snapshot_timestamp.

Referenced by pg_stat_get_snapshot_timestamp().

◆ pgstat_have_entry()

bool pgstat_have_entry ( PgStat_Kind  kind,
Oid  dboid,
Oid  objoid 
)

Definition at line 882 of file pgstat.c.

883 {
884  /* fixed-numbered stats always exist */
885  if (pgstat_get_kind_info(kind)->fixed_amount)
886  return true;
887 
888  return pgstat_get_entry_ref(kind, dboid, objoid, false, NULL) != NULL;
889 }

References pgstat_get_entry_ref(), and pgstat_get_kind_info().

Referenced by pg_stat_have_stats().

◆ pgstat_initialize()

void pgstat_initialize ( void  )

Definition at line 522 of file pgstat.c.

523 {
524  Assert(!pgstat_is_initialized);
525 
527 
528  pgstat_init_wal();
529 
530  /* Set up a process-exit hook to clean up */
532 
533 #ifdef USE_ASSERT_CHECKING
534  pgstat_is_initialized = true;
535 #endif
536 }
void before_shmem_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:333
static void pgstat_shutdown_hook(int code, Datum arg)
Definition: pgstat.c:488
void pgstat_attach_shmem(void)
Definition: pgstat_shmem.c:213
void pgstat_init_wal(void)
Definition: pgstat_wal.c:126

References Assert(), before_shmem_exit(), pgstat_attach_shmem(), pgstat_init_wal(), and pgstat_shutdown_hook().

Referenced by BaseInit().

◆ pgstat_is_kind_valid()

static bool pgstat_is_kind_valid ( int  ikind)
inlinestatic

Definition at line 1204 of file pgstat.c.

1205 {
1206  return ikind >= PGSTAT_KIND_FIRST_VALID && ikind <= PGSTAT_KIND_LAST;
1207 }

References PGSTAT_KIND_FIRST_VALID, and PGSTAT_KIND_LAST.

Referenced by pgstat_get_kind_info(), pgstat_read_statsfile(), and pgstat_snapshot_fixed().

◆ pgstat_prep_pending_entry()

PgStat_EntryRef* pgstat_prep_pending_entry ( PgStat_Kind  kind,
Oid  dboid,
Oid  objoid,
bool created_entry 
)

Definition at line 1052 of file pgstat.c.

1053 {
1054  PgStat_EntryRef *entry_ref;
1055 
1056  /* need to be able to flush out */
1057  Assert(pgstat_get_kind_info(kind)->flush_pending_cb != NULL);
1058 
1060  {
1063  "PgStat Pending",
1065  }
1066 
1067  entry_ref = pgstat_get_entry_ref(kind, dboid, objoid,
1068  true, created_entry);
1069 
1070  if (entry_ref->pending == NULL)
1071  {
1072  size_t entrysize = pgstat_get_kind_info(kind)->pending_size;
1073 
1074  Assert(entrysize != (size_t) -1);
1075 
1076  entry_ref->pending = MemoryContextAllocZero(pgStatPendingContext, entrysize);
1078  }
1079 
1080  return entry_ref;
1081 }
#define unlikely(x)
Definition: c.h:273
static void dlist_push_tail(dlist_head *head, dlist_node *node)
Definition: ilist.h:317
void * MemoryContextAllocZero(MemoryContext context, Size size)
Definition: mcxt.c:906
MemoryContext CacheMemoryContext
Definition: mcxt.c:51
#define AllocSetContextCreate
Definition: memutils.h:173
#define ALLOCSET_SMALL_SIZES
Definition: memutils.h:207
static MemoryContext pgStatPendingContext
Definition: pgstat.c:211

References ALLOCSET_SMALL_SIZES, AllocSetContextCreate, Assert(), CacheMemoryContext, dlist_push_tail(), MemoryContextAllocZero(), PgStat_EntryRef::pending, PgStat_EntryRef::pending_node, PgStat_KindInfo::pending_size, pgstat_get_entry_ref(), pgstat_get_kind_info(), pgStatPending, pgStatPendingContext, and unlikely.

Referenced by pgstat_init_function_usage(), pgstat_prep_database_pending(), pgstat_prep_relation_pending(), and pgstat_report_subscription_error().

◆ pgstat_prep_snapshot()

static void pgstat_prep_snapshot ( void  )
static

◆ pgstat_read_statsfile()

static void pgstat_read_statsfile ( void  )
static

Definition at line 1424 of file pgstat.c.

1425 {
1426  FILE *fpin;
1427  int32 format_id;
1428  bool found;
1429  const char *statfile = PGSTAT_STAT_PERMANENT_FILENAME;
1431 
1432  /* shouldn't be called from postmaster */
1434 
1435  elog(DEBUG2, "reading stats file \"%s\"", statfile);
1436 
1437  /*
1438  * Try to open the stats file. If it doesn't exist, the backends simply
1439  * returns zero for anything and statistics simply starts from scratch
1440  * with empty counters.
1441  *
1442  * ENOENT is a possibility if stats collection was previously disabled or
1443  * has not yet written the stats file for the first time. Any other
1444  * failure condition is suspicious.
1445  */
1446  if ((fpin = AllocateFile(statfile, PG_BINARY_R)) == NULL)
1447  {
1448  if (errno != ENOENT)
1449  ereport(LOG,
1451  errmsg("could not open statistics file \"%s\": %m",
1452  statfile)));
1454  return;
1455  }
1456 
1457  /*
1458  * Verify it's of the expected format.
1459  */
1460  if (!read_chunk_s(fpin, &format_id) ||
1461  format_id != PGSTAT_FILE_FORMAT_ID)
1462  goto error;
1463 
1464  /*
1465  * XXX: The following could now be generalized to just iterate over
1466  * pgstat_kind_infos instead of knowing about the different kinds of
1467  * stats.
1468  */
1469 
1470  /*
1471  * Read archiver stats struct
1472  */
1473  if (!read_chunk_s(fpin, &shmem->archiver.stats))
1474  goto error;
1475 
1476  /*
1477  * Read bgwriter stats struct
1478  */
1479  if (!read_chunk_s(fpin, &shmem->bgwriter.stats))
1480  goto error;
1481 
1482  /*
1483  * Read checkpointer stats struct
1484  */
1485  if (!read_chunk_s(fpin, &shmem->checkpointer.stats))
1486  goto error;
1487 
1488  /*
1489  * Read SLRU stats struct
1490  */
1491  if (!read_chunk_s(fpin, &shmem->slru.stats))
1492  goto error;
1493 
1494  /*
1495  * Read WAL stats struct
1496  */
1497  if (!read_chunk_s(fpin, &shmem->wal.stats))
1498  goto error;
1499 
1500  /*
1501  * We found an existing statistics file. Read it and put all the hash
1502  * table entries into place.
1503  */
1504  for (;;)
1505  {
1506  int t = fgetc(fpin);
1507 
1508  switch (t)
1509  {
1510  case 'S':
1511  case 'N':
1512  {
1516 
1518 
1519  if (t == 'S')
1520  {
1521  /* normal stats entry, identified by PgStat_HashKey */
1522  if (!read_chunk_s(fpin, &key))
1523  goto error;
1524 
1525  if (!pgstat_is_kind_valid(key.kind))
1526  goto error;
1527  }
1528  else
1529  {
1530  /* stats entry identified by name on disk (e.g. slots) */
1531  const PgStat_KindInfo *kind_info = NULL;
1532  PgStat_Kind kind;
1533  NameData name;
1534 
1535  if (!read_chunk_s(fpin, &kind))
1536  goto error;
1537  if (!read_chunk_s(fpin, &name))
1538  goto error;
1539  if (!pgstat_is_kind_valid(kind))
1540  goto error;
1541 
1542  kind_info = pgstat_get_kind_info(kind);
1543 
1544  if (!kind_info->from_serialized_name)
1545  goto error;
1546 
1547  if (!kind_info->from_serialized_name(&name, &key))
1548  {
1549  /* skip over data for entry we don't care about */
1550  if (fseek(fpin, pgstat_get_entry_len(kind), SEEK_CUR) != 0)
1551  goto error;
1552 
1553  continue;
1554  }
1555 
1556  Assert(key.kind == kind);
1557  }
1558 
1559  /*
1560  * This intentionally doesn't use pgstat_get_entry_ref() -
1561  * putting all stats into checkpointer's
1562  * pgStatEntryRefHash would be wasted effort and memory.
1563  */
1565 
1566  /* don't allow duplicate entries */
1567  if (found)
1568  {
1570  elog(WARNING, "found duplicate stats entry %d/%u/%u",
1571  key.kind, key.dboid, key.objoid);
1572  goto error;
1573  }
1574 
1575  header = pgstat_init_entry(key.kind, p);
1577 
1578  if (!read_chunk(fpin,
1580  pgstat_get_entry_len(key.kind)))
1581  goto error;
1582 
1583  break;
1584  }
1585  case 'E':
1586  /* check that 'E' actually signals end of file */
1587  if (fgetc(fpin) != EOF)
1588  goto error;
1589 
1590  goto done;
1591 
1592  default:
1593  goto error;
1594  }
1595  }
1596 
1597 done:
1598  FreeFile(fpin);
1599 
1600  elog(DEBUG2, "removing permanent stats file \"%s\"", statfile);
1601  unlink(statfile);
1602 
1603  return;
1604 
1605 error:
1606  ereport(LOG,
1607  (errmsg("corrupted statistics file \"%s\"", statfile)));
1608 
1610 
1611  goto done;
1612 }
#define PG_BINARY_R
Definition: c.h:1270
signed int int32
Definition: c.h:429
void dshash_release_lock(dshash_table *hash_table, void *entry)
Definition: dshash.c:569
void * dshash_find_or_insert(dshash_table *hash_table, const void *key, bool *found)
Definition: dshash.c:438
#define WARNING
Definition: elog.h:30
FILE * AllocateFile(const char *name, const char *mode)
Definition: fd.c:2461
int FreeFile(FILE *file)
Definition: fd.c:2660
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:121
static void header(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:212
static bool read_chunk(FILE *fpin, void *ptr, size_t len)
Definition: pgstat.c:1410
#define read_chunk_s(fpin, ptr)
Definition: pgstat.c:1415
#define PGSTAT_FILE_FORMAT_ID
Definition: pgstat.h:245
static size_t pgstat_get_entry_len(PgStat_Kind kind)
PgStatShared_Common * pgstat_init_entry(PgStat_Kind kind, PgStatShared_HashEntry *shhashent)
Definition: pgstat_shmem.c:254
static void error(void)
Definition: sql-dyntest.c:147
PgStat_ArchiverStats stats
PgStat_BgWriterStats stats
PgStat_CheckpointerStats stats
PgStat_SLRUStats stats[SLRU_NUM_ELEMENTS]
PgStat_WalStats stats
bool(* from_serialized_name)(const NameData *name, PgStat_HashKey *key)
PgStatShared_SLRU slru
PgStatShared_Wal wal
PgStatShared_Archiver archiver
PgStatShared_Checkpointer checkpointer
PgStatShared_BgWriter bgwriter
Definition: c.h:676

References AllocateFile(), PgStat_ShmemControl::archiver, Assert(), PgStat_ShmemControl::bgwriter, CHECK_FOR_INTERRUPTS, PgStat_ShmemControl::checkpointer, DEBUG2, dshash_find_or_insert(), dshash_release_lock(), elog, ereport, errcode_for_file_access(), errmsg(), error(), FreeFile(), PgStat_KindInfo::from_serialized_name, header(), IsPostmasterEnvironment, IsUnderPostmaster, sort-test::key, LOG, name, PG_BINARY_R, PGSTAT_FILE_FORMAT_ID, pgstat_get_entry_data(), pgstat_get_entry_len(), pgstat_get_kind_info(), pgstat_init_entry(), pgstat_is_kind_valid(), pgstat_reset_after_failure(), PGSTAT_STAT_PERMANENT_FILENAME, pgStatLocal, read_chunk(), read_chunk_s, PgStat_LocalState::shared_hash, PgStat_LocalState::shmem, PgStat_ShmemControl::slru, PgStatShared_Archiver::stats, PgStatShared_BgWriter::stats, PgStatShared_Checkpointer::stats, PgStatShared_SLRU::stats, PgStatShared_Wal::stats, PgStat_ShmemControl::wal, and WARNING.

Referenced by pgstat_restore_stats().

◆ pgstat_report_stat()

long pgstat_report_stat ( bool  force)

Definition at line 564 of file pgstat.c.

565 {
566  static TimestampTz pending_since = 0;
567  static TimestampTz last_flush = 0;
568  bool partial_flush;
570  bool nowait;
571 
574 
575  /* "absorb" the forced flush even if there's nothing to flush */
577  {
578  force = true;
579  pgStatForceNextFlush = false;
580  }
581 
582  /* Don't expend a clock check if nothing to do */
584  !have_slrustats &&
586  {
587  Assert(pending_since == 0);
588  return 0;
589  }
590 
591  /*
592  * There should never be stats to report once stats are shut down. Can't
593  * assert that before the checks above, as there is an unconditional
594  * pgstat_report_stat() call in pgstat_shutdown_hook() - which at least
595  * the process that ran pgstat_before_server_shutdown() will still call.
596  */
598 
600 
601  if (!force)
602  {
603  if (pending_since > 0 &&
605  {
606  /* don't keep pending updates longer than PGSTAT_MAX_INTERVAL */
607  force = true;
608  }
609  else if (last_flush > 0 &&
611  {
612  /* don't flush too frequently */
613  if (pending_since == 0)
614  pending_since = now;
615 
616  return PGSTAT_IDLE_INTERVAL;
617  }
618  }
619 
621 
622  /* don't wait for lock acquisition when !force */
623  nowait = !force;
624 
625  partial_flush = false;
626 
627  /* flush database / relation / function / ... stats */
628  partial_flush |= pgstat_flush_pending_entries(nowait);
629 
630  /* flush wal stats */
631  partial_flush |= pgstat_flush_wal(nowait);
632 
633  /* flush SLRU stats */
634  partial_flush |= pgstat_slru_flush(nowait);
635 
636  last_flush = now;
637 
638  /*
639  * If some of the pending stats could not be flushed due to lock
640  * contention, let the caller know when to retry.
641  */
642  if (partial_flush)
643  {
644  /* force should have prevented us from getting here */
645  Assert(!force);
646 
647  /* remember since when stats have been pending */
648  if (pending_since == 0)
649  pending_since = now;
650 
651  return PGSTAT_IDLE_INTERVAL;
652  }
653 
654  pending_since = 0;
655 
656  return 0;
657 }
bool TimestampDifferenceExceeds(TimestampTz start_time, TimestampTz stop_time, int msec)
Definition: timestamp.c:1705
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1538
int64 TimestampTz
Definition: timestamp.h:39
#define PGSTAT_MIN_INTERVAL
Definition: pgstat.c:118
static bool pgstat_flush_pending_entries(bool nowait)
Definition: pgstat.c:1127
#define PGSTAT_MAX_INTERVAL
Definition: pgstat.c:120
#define PGSTAT_IDLE_INTERVAL
Definition: pgstat.c:122
void pgstat_update_dbstats(TimestampTz ts)
bool have_slrustats
Definition: pgstat_slru.c:35
bool pgstat_slru_flush(bool nowait)
Definition: pgstat_slru.c:158
bool pgstat_have_pending_wal(void)
Definition: pgstat_wal.c:144
bool pgstat_flush_wal(bool nowait)
Definition: pgstat_wal.c:68
bool IsTransactionBlock(void)
Definition: xact.c:4766
TimestampTz GetCurrentTransactionStopTimestamp(void)
Definition: xact.c:872

References Assert(), dlist_is_empty(), GetCurrentTransactionStopTimestamp(), have_slrustats, PgStat_ShmemControl::is_shutdown, IsTransactionBlock(), now(), pgstat_assert_is_up, pgstat_flush_pending_entries(), pgstat_flush_wal(), pgstat_have_pending_wal(), PGSTAT_IDLE_INTERVAL, PGSTAT_MAX_INTERVAL, PGSTAT_MIN_INTERVAL, pgstat_slru_flush(), pgstat_update_dbstats(), pgStatForceNextFlush, pgStatLocal, pgStatPending, PgStat_LocalState::shmem, and TimestampDifferenceExceeds().

Referenced by AllTablesyncsReady(), apply_handle_commit_internal(), apply_handle_commit_prepared(), apply_handle_prepare(), apply_handle_rollback_prepared(), apply_handle_stream_prepare(), LogicalRepApplyLoop(), LogicalRepSyncTableStart(), pg_attribute_noreturn(), pgstat_before_server_shutdown(), pgstat_shutdown_hook(), PostgresMain(), process_syncing_tables_for_apply(), and ProcessInterrupts().

◆ pgstat_reset()

void pgstat_reset ( PgStat_Kind  kind,
Oid  dboid,
Oid  objoid 
)

Definition at line 704 of file pgstat.c.

705 {
706  const PgStat_KindInfo *kind_info = pgstat_get_kind_info(kind);
708 
709  /* not needed atm, and doesn't make sense with the current signature */
710  Assert(!pgstat_get_kind_info(kind)->fixed_amount);
711 
712  /* reset the "single counter" */
713  pgstat_reset_entry(kind, dboid, objoid, ts);
714 
715  if (!kind_info->accessed_across_databases)
717 }
void pgstat_reset_database_timestamp(Oid dboid, TimestampTz ts)
void pgstat_reset_entry(PgStat_Kind kind, Oid dboid, Oid objoid, TimestampTz ts)
Definition: pgstat_shmem.c:913

References PgStat_KindInfo::accessed_across_databases, Assert(), GetCurrentTimestamp(), pgstat_get_kind_info(), pgstat_reset_database_timestamp(), and pgstat_reset_entry().

Referenced by pg_stat_reset_single_function_counters(), pg_stat_reset_single_table_counters(), pg_stat_reset_subscription_stats(), pgstat_create_transactional(), and pgstat_reset_replslot().

◆ pgstat_reset_after_failure()

static void pgstat_reset_after_failure ( void  )
static

Definition at line 1619 of file pgstat.c.

1620 {
1622 
1623  /* reset fixed-numbered stats */
1624  for (int kind = PGSTAT_KIND_FIRST_VALID; kind <= PGSTAT_KIND_LAST; kind++)
1625  {
1626  const PgStat_KindInfo *kind_info = pgstat_get_kind_info(kind);
1627 
1628  if (!kind_info->fixed_amount)
1629  continue;
1630 
1631  kind_info->reset_all_cb(ts);
1632  }
1633 
1634  /* and drop variable-numbered ones */
1636 }
void pgstat_drop_all_entries(void)
Definition: pgstat_shmem.c:875
void(* reset_all_cb)(TimestampTz ts)

References PgStat_KindInfo::fixed_amount, GetCurrentTimestamp(), pgstat_drop_all_entries(), pgstat_get_kind_info(), PGSTAT_KIND_FIRST_VALID, PGSTAT_KIND_LAST, and PgStat_KindInfo::reset_all_cb.

Referenced by pgstat_discard_stats(), and pgstat_read_statsfile().

◆ pgstat_reset_counters()

void pgstat_reset_counters ( void  )

Definition at line 685 of file pgstat.c.

686 {
688 
691  ts);
692 }
static bool match_db_entries(PgStatShared_HashEntry *entry, Datum match_data)
Definition: pgstat.c:673
void pgstat_reset_matching_entries(bool(*do_reset)(PgStatShared_HashEntry *, Datum), Datum match_data, TimestampTz ts)
Definition: pgstat_shmem.c:933
#define ObjectIdGetDatum(X)
Definition: postgres.h:551

References GetCurrentTimestamp(), match_db_entries(), MyDatabaseId, ObjectIdGetDatum, and pgstat_reset_matching_entries().

Referenced by pg_stat_reset().

◆ pgstat_reset_of_kind()

void pgstat_reset_of_kind ( PgStat_Kind  kind)

Definition at line 726 of file pgstat.c.

727 {
728  const PgStat_KindInfo *kind_info = pgstat_get_kind_info(kind);
730 
731  if (kind_info->fixed_amount)
732  kind_info->reset_all_cb(ts);
733  else
735 }
void pgstat_reset_entries_of_kind(PgStat_Kind kind, TimestampTz ts)
Definition: pgstat_shmem.c:969

References PgStat_KindInfo::fixed_amount, GetCurrentTimestamp(), pgstat_get_kind_info(), pgstat_reset_entries_of_kind(), and PgStat_KindInfo::reset_all_cb.

Referenced by pg_stat_reset_replication_slot(), pg_stat_reset_shared(), pg_stat_reset_slru(), and pg_stat_reset_subscription_stats().

◆ pgstat_restore_stats()

void pgstat_restore_stats ( void  )

Definition at line 392 of file pgstat.c.

393 {
395 }
static void pgstat_read_statsfile(void)
Definition: pgstat.c:1424

References pgstat_read_statsfile().

Referenced by StartupXLOG().

◆ pgstat_shutdown_hook()

static void pgstat_shutdown_hook ( int  code,
Datum  arg 
)
static

Definition at line 488 of file pgstat.c.

489 {
490  Assert(!pgstat_is_shutdown);
492 
493  /*
494  * If we got as far as discovering our own database ID, we can flush out
495  * what we did so far. Otherwise, we'd be reporting an invalid database
496  * ID, so forget it. (This means that accesses to pg_database during
497  * failed backend starts might never get counted.)
498  */
501 
502  pgstat_report_stat(true);
503 
504  /* there shouldn't be any pending changes left */
507 
509 
510 #ifdef USE_ASSERT_CHECKING
511  pgstat_is_shutdown = true;
512 #endif
513 }
#define OidIsValid(objectId)
Definition: c.h:710
static void dlist_init(dlist_head *head)
Definition: ilist.h:278
void pgstat_report_disconnect(Oid dboid)
void pgstat_detach_shmem(void)
Definition: pgstat_shmem.c:233

References Assert(), dlist_init(), dlist_is_empty(), IsPostmasterEnvironment, IsUnderPostmaster, MyDatabaseId, OidIsValid, pgstat_detach_shmem(), pgstat_report_disconnect(), pgstat_report_stat(), and pgStatPending.

Referenced by pgstat_initialize().

◆ pgstat_snapshot_fixed()

◆ pgstat_write_statsfile()

static void pgstat_write_statsfile ( void  )
static

Definition at line 1255 of file pgstat.c.

1256 {
1257  FILE *fpout;
1258  int32 format_id;
1259  const char *tmpfile = PGSTAT_STAT_PERMANENT_TMPFILE;
1260  const char *statfile = PGSTAT_STAT_PERMANENT_FILENAME;
1261  dshash_seq_status hstat;
1263 
1265 
1266  /* we're shutting down, so it's ok to just override this */
1268 
1269  elog(DEBUG2, "writing stats file \"%s\"", statfile);
1270 
1271  /*
1272  * Open the statistics temp file to write out the current values.
1273  */
1274  fpout = AllocateFile(tmpfile, PG_BINARY_W);
1275  if (fpout == NULL)
1276  {
1277  ereport(LOG,
1279  errmsg("could not open temporary statistics file \"%s\": %m",
1280  tmpfile)));
1281  return;
1282  }
1283 
1284  /*
1285  * Write the file header --- currently just a format ID.
1286  */
1287  format_id = PGSTAT_FILE_FORMAT_ID;
1288  write_chunk_s(fpout, &format_id);
1289 
1290  /*
1291  * XXX: The following could now be generalized to just iterate over
1292  * pgstat_kind_infos instead of knowing about the different kinds of
1293  * stats.
1294  */
1295 
1296  /*
1297  * Write archiver stats struct
1298  */
1301 
1302  /*
1303  * Write bgwriter stats struct
1304  */
1307 
1308  /*
1309  * Write checkpointer stats struct
1310  */
1313 
1314  /*
1315  * Write SLRU stats struct
1316  */
1319 
1320  /*
1321  * Write WAL stats struct
1322  */
1325 
1326  /*
1327  * Walk through the stats entries
1328  */
1329  dshash_seq_init(&hstat, pgStatLocal.shared_hash, false);
1330  while ((ps = dshash_seq_next(&hstat)) != NULL)
1331  {
1332  PgStatShared_Common *shstats;
1333  const PgStat_KindInfo *kind_info = NULL;
1334 
1336 
1337  /* we may have some "dropped" entries not yet removed, skip them */
1338  Assert(!ps->dropped);
1339  if (ps->dropped)
1340  continue;
1341 
1343 
1344  kind_info = pgstat_get_kind_info(ps->key.kind);
1345 
1346  /* if not dropped the valid-entry refcount should exist */
1347  Assert(pg_atomic_read_u32(&ps->refcount) > 0);
1348 
1349  if (!kind_info->to_serialized_name)
1350  {
1351  /* normal stats entry, identified by PgStat_HashKey */
1352  fputc('S', fpout);
1353  write_chunk_s(fpout, &ps->key);
1354  }
1355  else
1356  {
1357  /* stats entry identified by name on disk (e.g. slots) */
1358  NameData name;
1359 
1360  kind_info->to_serialized_name(shstats, &name);
1361 
1362  fputc('N', fpout);
1363  write_chunk_s(fpout, &ps->key.kind);
1364  write_chunk_s(fpout, &name);
1365  }
1366 
1367  /* Write except the header part of the entry */
1368  write_chunk(fpout,
1369  pgstat_get_entry_data(ps->key.kind, shstats),
1371  }
1372  dshash_seq_term(&hstat);
1373 
1374  /*
1375  * No more output to be done. Close the temp file and replace the old
1376  * pgstat.stat with it. The ferror() check replaces testing for error
1377  * after each individual fputc or fwrite (in write_chunk()) above.
1378  */
1379  fputc('E', fpout);
1380 
1381  if (ferror(fpout))
1382  {
1383  ereport(LOG,
1385  errmsg("could not write temporary statistics file \"%s\": %m",
1386  tmpfile)));
1387  FreeFile(fpout);
1388  unlink(tmpfile);
1389  }
1390  else if (FreeFile(fpout) < 0)
1391  {
1392  ereport(LOG,
1394  errmsg("could not close temporary statistics file \"%s\": %m",
1395  tmpfile)));
1396  unlink(tmpfile);
1397  }
1398  else if (rename(tmpfile, statfile) < 0)
1399  {
1400  ereport(LOG,
1402  errmsg("could not rename temporary statistics file \"%s\" to \"%s\": %m",
1403  tmpfile, statfile)));
1404  unlink(tmpfile);
1405  }
1406 }
#define PG_BINARY_W
Definition: c.h:1271
static void write_chunk(FILE *fpout, void *ptr, size_t len)
Definition: pgstat.c:1238
#define write_chunk_s(fpout, ptr)
Definition: pgstat.c:1248
@ PGSTAT_KIND_ARCHIVER
Definition: pgstat.h:48
@ PGSTAT_KIND_SLRU
Definition: pgstat.h:51
@ PGSTAT_KIND_BGWRITER
Definition: pgstat.h:49
@ PGSTAT_KIND_CHECKPOINTER
Definition: pgstat.h:50
@ PGSTAT_KIND_WAL
Definition: pgstat.h:52
#define PGSTAT_STAT_PERMANENT_TMPFILE
Definition: pgstat.h:29
void(* to_serialized_name)(const PgStatShared_Common *header, NameData *name)
PgStat_CheckpointerStats checkpointer
PgStat_WalStats wal
PgStat_ArchiverStats archiver
PgStat_SLRUStats slru[SLRU_NUM_ELEMENTS]
PgStat_BgWriterStats bgwriter

References AllocateFile(), PgStat_Snapshot::archiver, Assert(), PgStat_Snapshot::bgwriter, PgStatShared_HashEntry::body, CHECK_FOR_INTERRUPTS, PgStat_Snapshot::checkpointer, DEBUG2, PgStatShared_HashEntry::dropped, PgStat_LocalState::dsa, dsa_get_address(), dshash_seq_init(), dshash_seq_next(), dshash_seq_term(), elog, ereport, errcode_for_file_access(), errmsg(), FreeFile(), PgStatShared_HashEntry::key, PgStat_HashKey::kind, LOG, name, pg_atomic_read_u32(), PG_BINARY_W, pgstat_assert_is_up, pgstat_build_snapshot_fixed(), pgstat_fetch_consistency, PGSTAT_FETCH_CONSISTENCY_NONE, PGSTAT_FILE_FORMAT_ID, pgstat_get_entry_data(), pgstat_get_entry_len(), pgstat_get_kind_info(), PGSTAT_KIND_ARCHIVER, PGSTAT_KIND_BGWRITER, PGSTAT_KIND_CHECKPOINTER, PGSTAT_KIND_SLRU, PGSTAT_KIND_WAL, PGSTAT_STAT_PERMANENT_FILENAME, PGSTAT_STAT_PERMANENT_TMPFILE, pgStatLocal, PgStatShared_HashEntry::refcount, PgStat_LocalState::shared_hash, PgStat_Snapshot::slru, PgStat_LocalState::snapshot, PgStat_KindInfo::to_serialized_name, PgStat_Snapshot::wal, write_chunk(), and write_chunk_s.

Referenced by pgstat_before_server_shutdown().

◆ read_chunk()

static bool read_chunk ( FILE *  fpin,
void *  ptr,
size_t  len 
)
static

Definition at line 1410 of file pgstat.c.

1411 {
1412  return fread(ptr, 1, len, fpin) == len;
1413 }
const void size_t len

References len.

Referenced by pgstat_read_statsfile().

◆ write_chunk()

static void write_chunk ( FILE *  fpout,
void *  ptr,
size_t  len 
)
static

Definition at line 1238 of file pgstat.c.

1239 {
1240  int rc;
1241 
1242  rc = fwrite(ptr, len, 1, fpout);
1243 
1244  /* we'll check for errors with ferror once at the end */
1245  (void) rc;
1246 }

References len.

Referenced by pgstat_write_statsfile().

Variable Documentation

◆ pgstat_fetch_consistency

◆ pgstat_kind_infos

const PgStat_KindInfo pgstat_kind_infos[PGSTAT_NUM_KINDS]
static

Definition at line 251 of file pgstat.c.

Referenced by pgstat_get_kind_from_str(), and pgstat_get_kind_info().

◆ pgstat_track_counts

◆ pgStatForceNextFlush

bool pgStatForceNextFlush = false
static

Definition at line 226 of file pgstat.c.

Referenced by pgstat_force_next_flush(), and pgstat_report_stat().

◆ pgStatLocal

◆ pgStatPending

dlist_head pgStatPending = DLIST_STATIC_INIT(pgStatPending)
static

◆ pgStatPendingContext

MemoryContext pgStatPendingContext = NULL
static

Definition at line 211 of file pgstat.c.

Referenced by pgstat_prep_pending_entry().