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help / color / mirror / Atom feedFrom: Kyotaro Horiguchi <[email protected]>
Subject: [PATCH v25 6/8] Shared-memory based stats collector
Date: Thu, 19 Mar 2020 15:11:14 +0900
Previously activity statistics is collected via sockets and shared
among backends through files periodically. Such files reaches tens of
megabytes and are created at most every 500ms and such large data is
serialized by stats collector then de-serialized on every backend
periodically. To evade that large cost, this patch places activity
statistics data on shared memory. Each backend accumulates statistics
numbers locally then tries to move them onto the shared statistics at
every transaction end but with intervals not shorter than 500ms. Locks
on the shared statistics is acquired by the units of such like tables,
functions so the expected chance of collision are not so
high. Furthermore, until 1 second has elapsed since the last flushing
to shared stats, lock failure postpones stats flushing so that lock
contention doesn't slow down transactions. Finally stats flush waits
for locks so that shared statistics doesn't get stale.
---
src/backend/access/transam/xlog.c | 4 +-
src/backend/catalog/index.c | 24 +-
src/backend/postmaster/autovacuum.c | 12 +-
src/backend/postmaster/bgwriter.c | 2 +-
src/backend/postmaster/checkpointer.c | 12 +-
src/backend/postmaster/pgarch.c | 4 +-
src/backend/postmaster/pgstat.c | 4625 +++++++-----------
src/backend/postmaster/postmaster.c | 85 +-
src/backend/storage/buffer/bufmgr.c | 8 +-
src/backend/storage/ipc/ipci.c | 2 +
src/backend/storage/lmgr/lwlock.c | 1 +
src/backend/tcop/postgres.c | 26 +-
src/backend/utils/adt/pgstatfuncs.c | 53 +-
src/backend/utils/init/globals.c | 1 +
src/backend/utils/init/postinit.c | 11 +
src/bin/pg_basebackup/t/010_pg_basebackup.pl | 4 +-
src/include/miscadmin.h | 2 +
src/include/pgstat.h | 500 +-
src/include/storage/lwlock.h | 1 +
src/include/utils/timeout.h | 1 +
20 files changed, 1991 insertions(+), 3387 deletions(-)
diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 5c477211e9..4ea29b8997 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -8506,9 +8506,9 @@ LogCheckpointEnd(bool restartpoint)
&sync_secs, &sync_usecs);
/* Accumulate checkpoint timing summary data, in milliseconds. */
- BgWriterStats.m_checkpoint_write_time +=
+ BgWriterStats.checkpoint_write_time +=
write_secs * 1000 + write_usecs / 1000;
- BgWriterStats.m_checkpoint_sync_time +=
+ BgWriterStats.checkpoint_sync_time +=
sync_secs * 1000 + sync_usecs / 1000;
/*
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 76fd938ce3..613cef9282 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -1687,28 +1687,10 @@ index_concurrently_swap(Oid newIndexId, Oid oldIndexId, const char *oldName)
/*
* Copy over statistics from old to new index
+ * The data will be sent by the next pgstat_report_stat()
+ * call.
*/
- {
- PgStat_StatTabEntry *tabentry;
-
- tabentry = pgstat_fetch_stat_tabentry(oldIndexId);
- if (tabentry)
- {
- if (newClassRel->pgstat_info)
- {
- newClassRel->pgstat_info->t_counts.t_numscans = tabentry->numscans;
- newClassRel->pgstat_info->t_counts.t_tuples_returned = tabentry->tuples_returned;
- newClassRel->pgstat_info->t_counts.t_tuples_fetched = tabentry->tuples_fetched;
- newClassRel->pgstat_info->t_counts.t_blocks_fetched = tabentry->blocks_fetched;
- newClassRel->pgstat_info->t_counts.t_blocks_hit = tabentry->blocks_hit;
-
- /*
- * The data will be sent by the next pgstat_report_stat()
- * call.
- */
- }
- }
- }
+ pgstat_copy_index_counters(oldIndexId, newClassRel->pgstat_info);
/* Close relations */
table_close(pg_class, RowExclusiveLock);
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index da75e755f0..333712d3c5 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -1956,15 +1956,15 @@ do_autovacuum(void)
ALLOCSET_DEFAULT_SIZES);
MemoryContextSwitchTo(AutovacMemCxt);
+ /* Start a transaction so our commands have one to play into. */
+ StartTransactionCommand();
+
/*
* may be NULL if we couldn't find an entry (only happens if we are
* forcing a vacuum for anti-wrap purposes).
*/
dbentry = pgstat_fetch_stat_dbentry(MyDatabaseId);
- /* Start a transaction so our commands have one to play into. */
- StartTransactionCommand();
-
/*
* Clean up any dead statistics collector entries for this DB. We always
* want to do this exactly once per DB-processing cycle, even if we find
@@ -2748,12 +2748,10 @@ get_pgstat_tabentry_relid(Oid relid, bool isshared, PgStat_StatDBEntry *shared,
if (isshared)
{
if (PointerIsValid(shared))
- tabentry = hash_search(shared->tables, &relid,
- HASH_FIND, NULL);
+ tabentry = pgstat_fetch_stat_tabentry_snapshot(shared, relid);
}
else if (PointerIsValid(dbentry))
- tabentry = hash_search(dbentry->tables, &relid,
- HASH_FIND, NULL);
+ tabentry = pgstat_fetch_stat_tabentry_snapshot(dbentry, relid);
return tabentry;
}
diff --git a/src/backend/postmaster/bgwriter.c b/src/backend/postmaster/bgwriter.c
index 069e27e427..94bdd664b5 100644
--- a/src/backend/postmaster/bgwriter.c
+++ b/src/backend/postmaster/bgwriter.c
@@ -236,7 +236,7 @@ BackgroundWriterMain(void)
/*
* Send off activity statistics to the stats collector
*/
- pgstat_send_bgwriter();
+ pgstat_report_bgwriter();
if (FirstCallSinceLastCheckpoint())
{
diff --git a/src/backend/postmaster/checkpointer.c b/src/backend/postmaster/checkpointer.c
index e354a78725..8a2fd0ddb2 100644
--- a/src/backend/postmaster/checkpointer.c
+++ b/src/backend/postmaster/checkpointer.c
@@ -350,7 +350,7 @@ CheckpointerMain(void)
if (((volatile CheckpointerShmemStruct *) CheckpointerShmem)->ckpt_flags)
{
do_checkpoint = true;
- BgWriterStats.m_requested_checkpoints++;
+ BgWriterStats.requested_checkpoints++;
}
/*
@@ -364,7 +364,7 @@ CheckpointerMain(void)
if (elapsed_secs >= CheckPointTimeout)
{
if (!do_checkpoint)
- BgWriterStats.m_timed_checkpoints++;
+ BgWriterStats.timed_checkpoints++;
do_checkpoint = true;
flags |= CHECKPOINT_CAUSE_TIME;
}
@@ -492,7 +492,7 @@ CheckpointerMain(void)
* worth the trouble to split the stats support into two independent
* stats message types.)
*/
- pgstat_send_bgwriter();
+ pgstat_report_bgwriter();
/*
* Sleep until we are signaled or it's time for another checkpoint or
@@ -693,7 +693,7 @@ CheckpointWriteDelay(int flags, double progress)
/*
* Report interim activity statistics to the stats collector.
*/
- pgstat_send_bgwriter();
+ pgstat_report_bgwriter();
/*
* This sleep used to be connected to bgwriter_delay, typically 200ms.
@@ -1238,8 +1238,8 @@ AbsorbSyncRequests(void)
LWLockAcquire(CheckpointerCommLock, LW_EXCLUSIVE);
/* Transfer stats counts into pending pgstats message */
- BgWriterStats.m_buf_written_backend += CheckpointerShmem->num_backend_writes;
- BgWriterStats.m_buf_fsync_backend += CheckpointerShmem->num_backend_fsync;
+ BgWriterStats.buf_written_backend += CheckpointerShmem->num_backend_writes;
+ BgWriterStats.buf_fsync_backend += CheckpointerShmem->num_backend_fsync;
CheckpointerShmem->num_backend_writes = 0;
CheckpointerShmem->num_backend_fsync = 0;
diff --git a/src/backend/postmaster/pgarch.c b/src/backend/postmaster/pgarch.c
index 6fe7a136ba..f0b524ca50 100644
--- a/src/backend/postmaster/pgarch.c
+++ b/src/backend/postmaster/pgarch.c
@@ -401,7 +401,7 @@ pgarch_ArchiverCopyLoop(void)
* Tell the collector about the WAL file that we successfully
* archived
*/
- pgstat_send_archiver(xlog, false);
+ pgstat_report_archiver(xlog, false);
break; /* out of inner retry loop */
}
@@ -411,7 +411,7 @@ pgarch_ArchiverCopyLoop(void)
* Tell the collector about the WAL file that we failed to
* archive
*/
- pgstat_send_archiver(xlog, true);
+ pgstat_report_archiver(xlog, true);
if (++failures >= NUM_ARCHIVE_RETRIES)
{
diff --git a/src/backend/postmaster/pgstat.c b/src/backend/postmaster/pgstat.c
index f9287b7942..34a4005791 100644
--- a/src/backend/postmaster/pgstat.c
+++ b/src/backend/postmaster/pgstat.c
@@ -1,15 +1,23 @@
/* ----------
* pgstat.c
*
- * All the statistics collector stuff hacked up in one big, ugly file.
+ * Activity Statistics facility.
*
- * TODO: - Separate collector, postmaster and backend stuff
- * into different files.
+ * Collects per-table and per-function usage statistics of all backends on
+ * shared memory. pg_count_*() and friends are the interface to locally store
+ * backend activities during a transaction. Then pgstat_flush_stat() is called
+ * at the end of a transaction to publish the local stats on shared memory.
*
- * - Add some automatic call for pgstat vacuuming.
+ * To avoid congestion on the shared memory, we update shared stats no more
+ * often than intervals of PGSTAT_STAT_MIN_INTERVAL(500ms). In the case where
+ * all the local numbers cannot be flushed immediately, we postpone updates
+ * and try the next chance after the interval of
+ * PGSTAT_STAT_RETRY_INTERVAL(100ms), but we don't wait for no longer than
+ * PGSTAT_STAT_MAX_INTERVAL(1000ms).
*
- * - Add a pgstat config column to pg_database, so this
- * entire thing can be enabled/disabled on a per db basis.
+ * The first process that uses activity statistics facility creates the area
+ * then load the stored stats file if any, and the last process at shutdown
+ * writes the shared stats to the file then destroy the area before exit.
*
* Copyright (c) 2001-2020, PostgreSQL Global Development Group
*
@@ -19,18 +27,6 @@
#include "postgres.h"
#include <unistd.h>
-#include <fcntl.h>
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-#include <netdb.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <signal.h>
-#include <time.h>
-#ifdef HAVE_SYS_SELECT_H
-#include <sys/select.h>
-#endif
#include "access/heapam.h"
#include "access/htup_details.h"
@@ -40,68 +36,43 @@
#include "access/xact.h"
#include "catalog/pg_database.h"
#include "catalog/pg_proc.h"
-#include "common/ip.h"
#include "libpq/libpq.h"
-#include "libpq/pqsignal.h"
-#include "mb/pg_wchar.h"
#include "miscadmin.h"
-#include "pg_trace.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/fork_process.h"
#include "postmaster/interrupt.h"
#include "postmaster/postmaster.h"
#include "replication/walsender.h"
-#include "storage/backendid.h"
-#include "storage/dsm.h"
-#include "storage/fd.h"
#include "storage/ipc.h"
-#include "storage/latch.h"
#include "storage/lmgr.h"
-#include "storage/pg_shmem.h"
+#include "storage/proc.h"
#include "storage/procsignal.h"
#include "storage/sinvaladt.h"
#include "utils/ascii.h"
#include "utils/guc.h"
#include "utils/memutils.h"
-#include "utils/ps_status.h"
-#include "utils/rel.h"
+#include "utils/probes.h"
#include "utils/snapmgr.h"
-#include "utils/timestamp.h"
/* ----------
* Timer definitions.
* ----------
*/
-#define PGSTAT_STAT_INTERVAL 500 /* Minimum time between stats file
- * updates; in milliseconds. */
-
-#define PGSTAT_RETRY_DELAY 10 /* How long to wait between checks for a
- * new file; in milliseconds. */
-
-#define PGSTAT_MAX_WAIT_TIME 10000 /* Maximum time to wait for a stats
- * file update; in milliseconds. */
-
-#define PGSTAT_INQ_INTERVAL 640 /* How often to ping the collector for a
- * new file; in milliseconds. */
+#define PGSTAT_STAT_MIN_INTERVAL 500 /* Minimum interval of stats data
+ * updates; in milliseconds. */
-#define PGSTAT_RESTART_INTERVAL 60 /* How often to attempt to restart a
- * failed statistics collector; in
- * seconds. */
-
-#define PGSTAT_POLL_LOOP_COUNT (PGSTAT_MAX_WAIT_TIME / PGSTAT_RETRY_DELAY)
-#define PGSTAT_INQ_LOOP_COUNT (PGSTAT_INQ_INTERVAL / PGSTAT_RETRY_DELAY)
-
-/* Minimum receive buffer size for the collector's socket. */
-#define PGSTAT_MIN_RCVBUF (100 * 1024)
+#define PGSTAT_STAT_RETRY_INTERVAL 100 /* Retry interval after
+ * PGSTAT_MIN_INTERVAL */
+#define PGSTAT_STAT_MAX_INTERVAL 1000 /* Longest interval of stats data
+ * updates; in milliseconds. */
/* ----------
- * The initial size hints for the hash tables used in the collector.
+ * The initial size hints for the hash tables used in the activity statistics.
* ----------
*/
-#define PGSTAT_DB_HASH_SIZE 16
-#define PGSTAT_TAB_HASH_SIZE 512
+#define PGSTAT_TABLE_HASH_SIZE 512
#define PGSTAT_FUNCTION_HASH_SIZE 512
@@ -116,7 +87,6 @@
*/
#define NumBackendStatSlots (MaxBackends + NUM_AUXPROCTYPES)
-
/* ----------
* GUC parameters
* ----------
@@ -131,76 +101,96 @@ int pgstat_track_activity_query_size = 1024;
* ----------
*/
char *pgstat_stat_directory = NULL;
+
+/* No longer used, but will be removed with GUC */
char *pgstat_stat_filename = NULL;
char *pgstat_stat_tmpname = NULL;
-/*
- * BgWriter global statistics counters (unused in other processes).
- * Stored directly in a stats message structure so it can be sent
- * without needing to copy things around. We assume this inits to zeroes.
- */
-PgStat_MsgBgWriter BgWriterStats;
-
-/* ----------
- * Local data
- * ----------
- */
-NON_EXEC_STATIC pgsocket pgStatSock = PGINVALID_SOCKET;
-
-static struct sockaddr_storage pgStatAddr;
-
-static time_t last_pgstat_start_time;
-
-static bool pgStatRunningInCollector = false;
-
-/*
- * Structures in which backends store per-table info that's waiting to be
- * sent to the collector.
- *
- * NOTE: once allocated, TabStatusArray structures are never moved or deleted
- * for the life of the backend. Also, we zero out the t_id fields of the
- * contained PgStat_TableStatus structs whenever they are not actively in use.
- * This allows relcache pgstat_info pointers to be treated as long-lived data,
- * avoiding repeated searches in pgstat_initstats() when a relation is
- * repeatedly opened during a transaction.
- */
-#define TABSTAT_QUANTUM 100 /* we alloc this many at a time */
-
-typedef struct TabStatusArray
+/* Shared stats bootstrap information, protected by StatsLock */
+typedef struct StatsShmemStruct
{
- struct TabStatusArray *tsa_next; /* link to next array, if any */
- int tsa_used; /* # entries currently used */
- PgStat_TableStatus tsa_entries[TABSTAT_QUANTUM]; /* per-table data */
-} TabStatusArray;
-
-static TabStatusArray *pgStatTabList = NULL;
+ dsa_handle stats_dsa_handle; /* DSA handle for stats data */
+ dshash_table_handle db_hash_handle;
+ dsa_pointer global_stats;
+ dsa_pointer archiver_stats;
+ int refcount;
+} StatsShmemStruct;
+
+/* BgWriter global statistics counters */
+PgStat_BgWriter BgWriterStats = {0};
+
+/* backend-lifetime storages */
+static StatsShmemStruct * StatsShmem = NULL;
+static dsa_area *area = NULL;
+static dshash_table *pgStatDBHash = NULL;
+
+
+/* parameter for shared hashes */
+static const dshash_parameters dsh_dbparams = {
+ sizeof(Oid),
+ SHARED_DBENT_SIZE,
+ dshash_memcmp,
+ dshash_memhash,
+ LWTRANCHE_STATS
+};
+static const dshash_parameters dsh_tblparams = {
+ sizeof(Oid),
+ sizeof(PgStat_StatTabEntry),
+ dshash_memcmp,
+ dshash_memhash,
+ LWTRANCHE_STATS
+};
+static const dshash_parameters dsh_funcparams = {
+ sizeof(Oid),
+ sizeof(PgStat_StatFuncEntry),
+ dshash_memcmp,
+ dshash_memhash,
+ LWTRANCHE_STATS
+};
/*
- * pgStatTabHash entry: map from relation OID to PgStat_TableStatus pointer
+ * Backends store per-table info that's waiting to be flushed out to shared
+ * memory in this hash table (indexed by table OID).
*/
-typedef struct TabStatHashEntry
-{
- Oid t_id;
- PgStat_TableStatus *tsa_entry;
-} TabStatHashEntry;
+static HTAB *pgStatTables = NULL;
/*
- * Hash table for O(1) t_id -> tsa_entry lookup
+ * Backends store per-function info that's waiting to be flushed out to shared
+ * memory in this hash table (indexed by function OID).
*/
-static HTAB *pgStatTabHash = NULL;
+static HTAB *pgStatFunctions = NULL;
/*
- * Backends store per-function info that's waiting to be sent to the collector
- * in this hash table (indexed by function OID).
+ * Backends store database-wide counters that's waiting to be flushed out to
+ * shared memory.
*/
-static HTAB *pgStatFunctions = NULL;
+static PgStat_TableCounts pgStatMyDatabaseStats = {0};
+static PgStat_TableCounts pgStatSharedDatabaseStats = {0};
/*
* Indicates if backend has some function stats that it hasn't yet
- * sent to the collector.
+ * written out to the shared stats.
*/
+static bool have_mydatabase_stats = false;
+static bool have_shdatabase_stats = false;
+static bool have_table_stats = false;
static bool have_function_stats = false;
+/* common header of snapshot entry in reader snapshot hash */
+typedef struct PgStat_snapshot
+{
+ Oid key;
+ bool negative;
+ void *body; /* end of header part: to keep alignment */
+} PgStat_snapshot;
+
+/* Hash entry struct for checksum_failures above */
+typedef struct ChecksumFailureEnt
+{
+ Oid dboid;
+ int count;
+} ChecksumFailureEnt;
+
/*
* Tuple insertion/deletion counts for an open transaction can't be propagated
* into PgStat_TableStatus counters until we know if it is going to commit
@@ -236,11 +226,15 @@ typedef struct TwoPhasePgStatRecord
bool t_truncated; /* was the relation truncated? */
} TwoPhasePgStatRecord;
-/*
- * Info about current "snapshot" of stats file
- */
+/* Variables for backend status snapshot */
static MemoryContext pgStatLocalContext = NULL;
-static HTAB *pgStatDBHash = NULL;
+static MemoryContext pgStatSnapshotContext = NULL;
+static HTAB *pgStatLocalHash = NULL;
+static bool clear_snapshot = false;
+
+/* Count checksum failure for each database */
+HTAB *checksum_failures = NULL;
+int nchecksum_failures = 0;
/* Status for backends including auxiliary */
static LocalPgBackendStatus *localBackendStatusTable = NULL;
@@ -249,19 +243,17 @@ static LocalPgBackendStatus *localBackendStatusTable = NULL;
static int localNumBackends = 0;
/*
- * Cluster wide statistics, kept in the stats collector.
- * Contains statistics that are not collected per database
- * or per table.
- */
-static PgStat_ArchiverStats archiverStats;
-static PgStat_GlobalStats globalStats;
-
-/*
- * List of OIDs of databases we need to write out. If an entry is InvalidOid,
- * it means to write only the shared-catalog stats ("DB 0"); otherwise, we
- * will write both that DB's data and the shared stats.
+ * Cluster wide statistics.
+ *
+ * Contains statistics that are collected not per database nor per table
+ * basis. shared_* points to shared memory and snapshot_* are backend
+ * snapshots. Their validity is indicated by global_snapshot_is_valid.
*/
-static List *pending_write_requests = NIL;
+static bool global_snapshot_is_valid = false;
+static PgStat_ArchiverStats *shared_archiverStats;
+static PgStat_ArchiverStats snapshot_archiverStats;
+static PgStat_GlobalStats *shared_globalStats;
+static PgStat_GlobalStats snapshot_globalStats;
/*
* Total time charged to functions so far in the current backend.
@@ -275,33 +267,34 @@ static instr_time total_func_time;
* Local function forward declarations
* ----------
*/
-#ifdef EXEC_BACKEND
-static pid_t pgstat_forkexec(void);
-#endif
-
-NON_EXEC_STATIC void PgstatCollectorMain(int argc, char *argv[]) pg_attribute_noreturn();
static void pgstat_beshutdown_hook(int code, Datum arg);
-
-static PgStat_StatDBEntry *pgstat_get_db_entry(Oid databaseid, bool create);
-static PgStat_StatTabEntry *pgstat_get_tab_entry(PgStat_StatDBEntry *dbentry,
+static PgStat_StatDBEntry *pgstat_get_db_entry(Oid databaseid, bool exclusive,
+ bool nowait, bool create);
+static PgStat_StatTabEntry *pgstat_get_tab_entry(dshash_table *table,
Oid tableoid, bool create);
-static void pgstat_write_statsfiles(bool permanent, bool allDbs);
-static void pgstat_write_db_statsfile(PgStat_StatDBEntry *dbentry, bool permanent);
-static HTAB *pgstat_read_statsfiles(Oid onlydb, bool permanent, bool deep);
-static void pgstat_read_db_statsfile(Oid databaseid, HTAB *tabhash, HTAB *funchash, bool permanent);
-static void backend_read_statsfile(void);
+static void pgstat_write_pgStatDBHashfile(PgStat_StatDBEntry *dbentry);
+static void pgstat_read_pgStatDBHashfile(PgStat_StatDBEntry *dbentry);
static void pgstat_read_current_status(void);
-static bool pgstat_write_statsfile_needed(void);
-static bool pgstat_db_requested(Oid databaseid);
-
-static void pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg);
-static void pgstat_send_funcstats(void);
+static void pgstat_flush_dbstats(bool shared, bool nowait);
+static bool pgstat_flush_tabstats(Oid dbid, dshash_table_handle tabhandle,
+ bool nowait);
+static bool pgstat_flush_funcstats(dshash_table_handle funchandle, bool nowait);
+static bool pgstat_update_tabentry(dshash_table *tabhash,
+ PgStat_TableStatus *stat, bool nowait);
static HTAB *pgstat_collect_oids(Oid catalogid, AttrNumber anum_oid);
+static void pgstat_remove_useless_entries(const dshash_table_handle dshhandle,
+ const dshash_parameters *dshparams,
+ HTAB *oidtab);
static PgStat_TableStatus *get_tabstat_entry(Oid rel_id, bool isshared);
static void pgstat_setup_memcxt(void);
+static void pgstat_flush_checksum_failure(bool nowait);
+static PgStat_SubXactStatus *get_tabstat_stack_level(int nest_level);
+static void add_tabstat_xact_level(PgStat_TableStatus *pgstat_info, int nest_level);
+static PgStat_StatFuncEntry *pgstat_fetch_stat_funcentry_snapshot(PgStat_StatDBEntry *dbent, Oid funcid);
+static void pgstat_snapshot_global_stats(void);
static const char *pgstat_get_wait_activity(WaitEventActivity w);
static const char *pgstat_get_wait_client(WaitEventClient w);
@@ -309,484 +302,210 @@ static const char *pgstat_get_wait_ipc(WaitEventIPC w);
static const char *pgstat_get_wait_timeout(WaitEventTimeout w);
static const char *pgstat_get_wait_io(WaitEventIO w);
-static void pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype);
-static void pgstat_send(void *msg, int len);
-
-static void pgstat_recv_inquiry(PgStat_MsgInquiry *msg, int len);
-static void pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len);
-static void pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len);
-static void pgstat_recv_dropdb(PgStat_MsgDropdb *msg, int len);
-static void pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len);
-static void pgstat_recv_resetsharedcounter(PgStat_MsgResetsharedcounter *msg, int len);
-static void pgstat_recv_resetsinglecounter(PgStat_MsgResetsinglecounter *msg, int len);
-static void pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len);
-static void pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len);
-static void pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len);
-static void pgstat_recv_archiver(PgStat_MsgArchiver *msg, int len);
-static void pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len);
-static void pgstat_recv_funcstat(PgStat_MsgFuncstat *msg, int len);
-static void pgstat_recv_funcpurge(PgStat_MsgFuncpurge *msg, int len);
-static void pgstat_recv_recoveryconflict(PgStat_MsgRecoveryConflict *msg, int len);
-static void pgstat_recv_deadlock(PgStat_MsgDeadlock *msg, int len);
-static void pgstat_recv_checksum_failure(PgStat_MsgChecksumFailure *msg, int len);
-static void pgstat_recv_tempfile(PgStat_MsgTempFile *msg, int len);
+/* ------------------------------------------------------------
+ * Local support functions follow
+ * ------------------------------------------------------------
+ */
+static void reset_dbentry_counters(PgStat_StatDBEntry *dbentry);
/* ------------------------------------------------------------
* Public functions called from postmaster follow
* ------------------------------------------------------------
*/
-/* ----------
- * pgstat_init() -
- *
- * Called from postmaster at startup. Create the resources required
- * by the statistics collector process. If unable to do so, do not
- * fail --- better to let the postmaster start with stats collection
- * disabled.
- * ----------
+/*
+ * StatsShmemSize
+ * Compute shared memory space needed for activity statistic
+ */
+Size
+StatsShmemSize(void)
+{
+ return sizeof(StatsShmemStruct);
+}
+
+/*
+ * StatsShmemInit - initialize during shared-memory creation
*/
void
-pgstat_init(void)
+StatsShmemInit(void)
{
- ACCEPT_TYPE_ARG3 alen;
- struct addrinfo *addrs = NULL,
- *addr,
- hints;
- int ret;
- fd_set rset;
- struct timeval tv;
- char test_byte;
- int sel_res;
- int tries = 0;
-
-#define TESTBYTEVAL ((char) 199)
+ bool found;
- /*
- * This static assertion verifies that we didn't mess up the calculations
- * involved in selecting maximum payload sizes for our UDP messages.
- * Because the only consequence of overrunning PGSTAT_MAX_MSG_SIZE would
- * be silent performance loss from fragmentation, it seems worth having a
- * compile-time cross-check that we didn't.
- */
- StaticAssertStmt(sizeof(PgStat_Msg) <= PGSTAT_MAX_MSG_SIZE,
- "maximum stats message size exceeds PGSTAT_MAX_MSG_SIZE");
+ StatsShmem = (StatsShmemStruct *)
+ ShmemInitStruct("Stats area", StatsShmemSize(),
+ &found);
- /*
- * Create the UDP socket for sending and receiving statistic messages
- */
- hints.ai_flags = AI_PASSIVE;
- hints.ai_family = AF_UNSPEC;
- hints.ai_socktype = SOCK_DGRAM;
- hints.ai_protocol = 0;
- hints.ai_addrlen = 0;
- hints.ai_addr = NULL;
- hints.ai_canonname = NULL;
- hints.ai_next = NULL;
- ret = pg_getaddrinfo_all("localhost", NULL, &hints, &addrs);
- if (ret || !addrs)
+ if (!IsUnderPostmaster)
{
- ereport(LOG,
- (errmsg("could not resolve \"localhost\": %s",
- gai_strerror(ret))));
- goto startup_failed;
- }
+ Assert(!found);
- /*
- * On some platforms, pg_getaddrinfo_all() may return multiple addresses
- * only one of which will actually work (eg, both IPv6 and IPv4 addresses
- * when kernel will reject IPv6). Worse, the failure may occur at the
- * bind() or perhaps even connect() stage. So we must loop through the
- * results till we find a working combination. We will generate LOG
- * messages, but no error, for bogus combinations.
- */
- for (addr = addrs; addr; addr = addr->ai_next)
- {
-#ifdef HAVE_UNIX_SOCKETS
- /* Ignore AF_UNIX sockets, if any are returned. */
- if (addr->ai_family == AF_UNIX)
- continue;
-#endif
+ StatsShmem->stats_dsa_handle = DSM_HANDLE_INVALID;
+ }
+}
- if (++tries > 1)
- ereport(LOG,
- (errmsg("trying another address for the statistics collector")));
+/* ----------
+ * pgstat_attach_shared_stats() -
+ *
+ * Attach shared or create stats memory.
+ * ---------
+ */
+static void
+pgstat_attach_shared_stats(void)
+{
+ PgStat_StatDBEntry *dbent;
- /*
- * Create the socket.
- */
- if ((pgStatSock = socket(addr->ai_family, SOCK_DGRAM, 0)) == PGINVALID_SOCKET)
- {
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("could not create socket for statistics collector: %m")));
- continue;
- }
+ MemoryContext oldcontext;
- /*
- * Bind it to a kernel assigned port on localhost and get the assigned
- * port via getsockname().
- */
- if (bind(pgStatSock, addr->ai_addr, addr->ai_addrlen) < 0)
- {
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("could not bind socket for statistics collector: %m")));
- closesocket(pgStatSock);
- pgStatSock = PGINVALID_SOCKET;
- continue;
- }
+ /*
+ * Don't use dsm under postmaster, or when not tracking counts.
+ */
+ if (!pgstat_track_counts || !IsUnderPostmaster)
+ return;
- alen = sizeof(pgStatAddr);
- if (getsockname(pgStatSock, (struct sockaddr *) &pgStatAddr, &alen) < 0)
- {
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("could not get address of socket for statistics collector: %m")));
- closesocket(pgStatSock);
- pgStatSock = PGINVALID_SOCKET;
- continue;
- }
+ pgstat_setup_memcxt();
- /*
- * Connect the socket to its own address. This saves a few cycles by
- * not having to respecify the target address on every send. This also
- * provides a kernel-level check that only packets from this same
- * address will be received.
- */
- if (connect(pgStatSock, (struct sockaddr *) &pgStatAddr, alen) < 0)
- {
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("could not connect socket for statistics collector: %m")));
- closesocket(pgStatSock);
- pgStatSock = PGINVALID_SOCKET;
- continue;
- }
+ if (area)
+ return;
- /*
- * Try to send and receive a one-byte test message on the socket. This
- * is to catch situations where the socket can be created but will not
- * actually pass data (for instance, because kernel packet filtering
- * rules prevent it).
- */
- test_byte = TESTBYTEVAL;
+ oldcontext = MemoryContextSwitchTo(TopMemoryContext);
-retry1:
- if (send(pgStatSock, &test_byte, 1, 0) != 1)
- {
- if (errno == EINTR)
- goto retry1; /* if interrupted, just retry */
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("could not send test message on socket for statistics collector: %m")));
- closesocket(pgStatSock);
- pgStatSock = PGINVALID_SOCKET;
- continue;
- }
+ LWLockAcquire(StatsLock, LW_EXCLUSIVE);
- /*
- * There could possibly be a little delay before the message can be
- * received. We arbitrarily allow up to half a second before deciding
- * it's broken.
- */
- for (;;) /* need a loop to handle EINTR */
- {
- FD_ZERO(&rset);
- FD_SET(pgStatSock, &rset);
+ if (StatsShmem->refcount > 0)
+ StatsShmem->refcount++;
+ else
+ {
+ /* Need to create shared memory area and load saved stats if any. */
+ Assert(StatsShmem->stats_dsa_handle == DSM_HANDLE_INVALID);
- tv.tv_sec = 0;
- tv.tv_usec = 500000;
- sel_res = select(pgStatSock + 1, &rset, NULL, NULL, &tv);
- if (sel_res >= 0 || errno != EINTR)
- break;
- }
- if (sel_res < 0)
- {
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("select() failed in statistics collector: %m")));
- closesocket(pgStatSock);
- pgStatSock = PGINVALID_SOCKET;
- continue;
- }
- if (sel_res == 0 || !FD_ISSET(pgStatSock, &rset))
- {
- /*
- * This is the case we actually think is likely, so take pains to
- * give a specific message for it.
- *
- * errno will not be set meaningfully here, so don't use it.
- */
- ereport(LOG,
- (errcode(ERRCODE_CONNECTION_FAILURE),
- errmsg("test message did not get through on socket for statistics collector")));
- closesocket(pgStatSock);
- pgStatSock = PGINVALID_SOCKET;
- continue;
- }
+ /* Initialize shared memory area */
+ area = dsa_create(LWTRANCHE_STATS);
+ pgStatDBHash = dshash_create(area, &dsh_dbparams, 0);
- test_byte++; /* just make sure variable is changed */
+ StatsShmem->stats_dsa_handle = dsa_get_handle(area);
+ StatsShmem->global_stats =
+ dsa_allocate0(area, sizeof(PgStat_GlobalStats));
+ StatsShmem->archiver_stats =
+ dsa_allocate0(area, sizeof(PgStat_ArchiverStats));
+ StatsShmem->db_hash_handle = dshash_get_hash_table_handle(pgStatDBHash);
-retry2:
- if (recv(pgStatSock, &test_byte, 1, 0) != 1)
- {
- if (errno == EINTR)
- goto retry2; /* if interrupted, just retry */
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("could not receive test message on socket for statistics collector: %m")));
- closesocket(pgStatSock);
- pgStatSock = PGINVALID_SOCKET;
- continue;
- }
+ shared_globalStats = (PgStat_GlobalStats *)
+ dsa_get_address(area, StatsShmem->global_stats);
+ shared_archiverStats = (PgStat_ArchiverStats *)
+ dsa_get_address(area, StatsShmem->archiver_stats);
- if (test_byte != TESTBYTEVAL) /* strictly paranoia ... */
- {
- ereport(LOG,
- (errcode(ERRCODE_INTERNAL_ERROR),
- errmsg("incorrect test message transmission on socket for statistics collector")));
- closesocket(pgStatSock);
- pgStatSock = PGINVALID_SOCKET;
- continue;
- }
+ /* Load saved data if any. */
+ pgstat_read_statsfiles();
- /* If we get here, we have a working socket */
- break;
+ StatsShmem->refcount = 1;
}
- /* Did we find a working address? */
- if (!addr || pgStatSock == PGINVALID_SOCKET)
- goto startup_failed;
+ LWLockRelease(StatsLock);
/*
- * Set the socket to non-blocking IO. This ensures that if the collector
- * falls behind, statistics messages will be discarded; backends won't
- * block waiting to send messages to the collector.
+ * If we're not the first process, attach existing shared stats area
+ * outside StatsLock.
*/
- if (!pg_set_noblock(pgStatSock))
+ if (!area)
{
- ereport(LOG,
- (errcode_for_socket_access(),
- errmsg("could not set statistics collector socket to nonblocking mode: %m")));
- goto startup_failed;
- }
-
- /*
- * Try to ensure that the socket's receive buffer is at least
- * PGSTAT_MIN_RCVBUF bytes, so that it won't easily overflow and lose
- * data. Use of UDP protocol means that we are willing to lose data under
- * heavy load, but we don't want it to happen just because of ridiculously
- * small default buffer sizes (such as 8KB on older Windows versions).
- */
- {
- int old_rcvbuf;
- int new_rcvbuf;
- ACCEPT_TYPE_ARG3 rcvbufsize = sizeof(old_rcvbuf);
-
- if (getsockopt(pgStatSock, SOL_SOCKET, SO_RCVBUF,
- (char *) &old_rcvbuf, &rcvbufsize) < 0)
- {
- elog(LOG, "getsockopt(SO_RCVBUF) failed: %m");
- /* if we can't get existing size, always try to set it */
- old_rcvbuf = 0;
- }
-
- new_rcvbuf = PGSTAT_MIN_RCVBUF;
- if (old_rcvbuf < new_rcvbuf)
- {
- if (setsockopt(pgStatSock, SOL_SOCKET, SO_RCVBUF,
- (char *) &new_rcvbuf, sizeof(new_rcvbuf)) < 0)
- elog(LOG, "setsockopt(SO_RCVBUF) failed: %m");
- }
+ /* Shared area already exists. Just attach it. */
+ area = dsa_attach(StatsShmem->stats_dsa_handle);
+ pgStatDBHash = dshash_attach(area, &dsh_dbparams,
+ StatsShmem->db_hash_handle, 0);
+
+ /* Setup local variables */
+ pgStatLocalHash = NULL;
+ shared_globalStats = (PgStat_GlobalStats *)
+ dsa_get_address(area, StatsShmem->global_stats);
+ shared_archiverStats = (PgStat_ArchiverStats *)
+ dsa_get_address(area, StatsShmem->archiver_stats);
}
- pg_freeaddrinfo_all(hints.ai_family, addrs);
-
- /* Now that we have a long-lived socket, tell fd.c about it. */
- ReserveExternalFD();
-
- return;
-
-startup_failed:
- ereport(LOG,
- (errmsg("disabling statistics collector for lack of working socket")));
-
- if (addrs)
- pg_freeaddrinfo_all(hints.ai_family, addrs);
-
- if (pgStatSock != PGINVALID_SOCKET)
- closesocket(pgStatSock);
- pgStatSock = PGINVALID_SOCKET;
+ MemoryContextSwitchTo(oldcontext);
/*
- * Adjust GUC variables to suppress useless activity, and for debugging
- * purposes (seeing track_counts off is a clue that we failed here). We
- * use PGC_S_OVERRIDE because there is no point in trying to turn it back
- * on from postgresql.conf without a restart.
+ * create db entries for the current database and shared table if not
+ * created yet.
*/
- SetConfigOption("track_counts", "off", PGC_INTERNAL, PGC_S_OVERRIDE);
+ dbent = pgstat_get_db_entry(MyDatabaseId, false, false, true);
+ Assert(dbent);
+ dshash_release_lock(pgStatDBHash, dbent);
+ dbent = pgstat_get_db_entry(InvalidOid, false, false, true);
+ Assert(dbent);
+ dshash_release_lock(pgStatDBHash, dbent);
+
+ /* don't detach automatically */
+ dsa_pin_mapping(area);
+ global_snapshot_is_valid = false;
}
-/*
- * subroutine for pgstat_reset_all
+/* ----------
+ * pgstat_detach_shared_stats() -
+ *
+ * Detach shared stats. Write out to file if we're the last process and told
+ * to do so.
+ * ----------
*/
static void
-pgstat_reset_remove_files(const char *directory)
+pgstat_detach_shared_stats(bool write_stats)
{
- DIR *dir;
- struct dirent *entry;
- char fname[MAXPGPATH * 2];
+ /* immediately return if useless */
+ if (!area || !IsUnderPostmaster)
+ return;
+
+ LWLockAcquire(StatsLock, LW_EXCLUSIVE);
- dir = AllocateDir(directory);
- while ((entry = ReadDir(dir, directory)) != NULL)
+ /* write out the shared stats to file if needed */
+ if (--StatsShmem->refcount < 1)
{
- int nchars;
- Oid tmp_oid;
+ if (write_stats)
+ pgstat_write_statsfiles();
- /*
- * Skip directory entries that don't match the file names we write.
- * See get_dbstat_filename for the database-specific pattern.
- */
- if (strncmp(entry->d_name, "global.", 7) == 0)
- nchars = 7;
- else
- {
- nchars = 0;
- (void) sscanf(entry->d_name, "db_%u.%n",
- &tmp_oid, &nchars);
- if (nchars <= 0)
- continue;
- /* %u allows leading whitespace, so reject that */
- if (strchr("0123456789", entry->d_name[3]) == NULL)
- continue;
- }
+ /* We're the last process. Invalidate the dsa area handle. */
+ StatsShmem->stats_dsa_handle = DSM_HANDLE_INVALID;
+ }
- if (strcmp(entry->d_name + nchars, "tmp") != 0 &&
- strcmp(entry->d_name + nchars, "stat") != 0)
- continue;
+ LWLockRelease(StatsLock);
- snprintf(fname, sizeof(fname), "%s/%s", directory,
- entry->d_name);
- unlink(fname);
- }
- FreeDir(dir);
+ /*
+ * Detach the area. Automatically destroyed when the last process detached
+ * it.
+ */
+ dsa_detach(area);
+
+ area = NULL;
+ pgStatDBHash = NULL;
+ shared_globalStats = NULL;
+ shared_archiverStats = NULL;
+ pgStatLocalHash = NULL;
+ global_snapshot_is_valid = false;
}
/*
* pgstat_reset_all() -
*
- * Remove the stats files. This is currently used only if WAL
- * recovery is needed after a crash.
+ * Remove the stats file. This is currently used only if WAL recovery is
+ * needed after a crash.
*/
void
pgstat_reset_all(void)
{
- pgstat_reset_remove_files(pgstat_stat_directory);
- pgstat_reset_remove_files(PGSTAT_STAT_PERMANENT_DIRECTORY);
-}
-
-#ifdef EXEC_BACKEND
-
-/*
- * pgstat_forkexec() -
- *
- * Format up the arglist for, then fork and exec, statistics collector process
- */
-static pid_t
-pgstat_forkexec(void)
-{
- char *av[10];
- int ac = 0;
-
- av[ac++] = "postgres";
- av[ac++] = "--forkcol";
- av[ac++] = NULL; /* filled in by postmaster_forkexec */
-
- av[ac] = NULL;
- Assert(ac < lengthof(av));
-
- return postmaster_forkexec(ac, av);
-}
-#endif /* EXEC_BACKEND */
-
-
-/*
- * pgstat_start() -
- *
- * Called from postmaster at startup or after an existing collector
- * died. Attempt to fire up a fresh statistics collector.
- *
- * Returns PID of child process, or 0 if fail.
- *
- * Note: if fail, we will be called again from the postmaster main loop.
- */
-int
-pgstat_start(void)
-{
- time_t curtime;
- pid_t pgStatPid;
+ /* standalone server doesn't use shared stats */
+ if (!IsUnderPostmaster)
+ return;
- /*
- * Check that the socket is there, else pgstat_init failed and we can do
- * nothing useful.
- */
- if (pgStatSock == PGINVALID_SOCKET)
- return 0;
+ /* we must have shared stats attached */
+ Assert(StatsShmem->stats_dsa_handle != DSM_HANDLE_INVALID);
- /*
- * Do nothing if too soon since last collector start. This is a safety
- * valve to protect against continuous respawn attempts if the collector
- * is dying immediately at launch. Note that since we will be re-called
- * from the postmaster main loop, we will get another chance later.
- */
- curtime = time(NULL);
- if ((unsigned int) (curtime - last_pgstat_start_time) <
- (unsigned int) PGSTAT_RESTART_INTERVAL)
- return 0;
- last_pgstat_start_time = curtime;
+ /* Startup must be the only user of shared stats */
+ Assert(StatsShmem->refcount == 1);
/*
- * Okay, fork off the collector.
+ * We could directly remove files and recreate the shared memory area. But
+ * detach then attach for simplicity.
*/
-#ifdef EXEC_BACKEND
- switch ((pgStatPid = pgstat_forkexec()))
-#else
- switch ((pgStatPid = fork_process()))
-#endif
- {
- case -1:
- ereport(LOG,
- (errmsg("could not fork statistics collector: %m")));
- return 0;
-
-#ifndef EXEC_BACKEND
- case 0:
- /* in postmaster child ... */
- InitPostmasterChild();
-
- /* Close the postmaster's sockets */
- ClosePostmasterPorts(false);
-
- /* Drop our connection to postmaster's shared memory, as well */
- dsm_detach_all();
- PGSharedMemoryDetach();
-
- PgstatCollectorMain(0, NULL);
- break;
-#endif
-
- default:
- return (int) pgStatPid;
- }
-
- /* shouldn't get here */
- return 0;
-}
-
-void
-allow_immediate_pgstat_restart(void)
-{
- last_pgstat_start_time = 0;
+ pgstat_detach_shared_stats(false); /* Don't write */
+ pgstat_attach_shared_stats();
}
/* ------------------------------------------------------------
@@ -794,259 +513,441 @@ allow_immediate_pgstat_restart(void)
*------------------------------------------------------------
*/
-
/* ----------
* pgstat_report_stat() -
*
* Must be called by processes that performs DML: tcop/postgres.c, logical
- * receiver processes, SPI worker, etc. to send the so far collected
- * per-table and function usage statistics to the collector. Note that this
- * is called only when not within a transaction, so it is fair to use
+ * receiver processes, SPI worker, etc. to apply the so far collected
+ * per-table and function usage statistics to the shared statistics hashes.
+ *
+ * Updates are applied not more frequent than the interval of
+ * PGSTAT_STAT_MIN_INTERVAL milliseconds. They are also postponed on lock
+ * failure if force is false and there's no pending updates longer than
+ * PGSTAT_STAT_MAX_INTERVAL milliseconds. Postponed updates are retried in
+ * succeeding calls of this function.
+ *
+ * Returns the time until the next timing when updates are applied in
+ * milliseconds if there are no updates held for more than
+ * PGSTAT_STAT_MIN_INTERVAL milliseconds.
+ *
+ * Note that this is called only out of a transaction, so it is fine to use
* transaction stop time as an approximation of current time.
- * ----------
+ * ----------
*/
-void
+long
pgstat_report_stat(bool force)
{
- /* we assume this inits to all zeroes: */
- static const PgStat_TableCounts all_zeroes;
- static TimestampTz last_report = 0;
-
+ static TimestampTz next_flush = 0;
+ static TimestampTz pending_since = 0;
TimestampTz now;
- PgStat_MsgTabstat regular_msg;
- PgStat_MsgTabstat shared_msg;
- TabStatusArray *tsa;
- int i;
+ PgStat_StatDBEntry *dbent;
+ bool nowait = !force; /* Don't use force ever after */
+ long elapsed;
+ long secs;
+ int usecs;
+ dshash_table_handle tables_handle;
+ dshash_table_handle functions_handle;
+ bool process_shared_tables = false;
/* Don't expend a clock check if nothing to do */
- if ((pgStatTabList == NULL || pgStatTabList->tsa_used == 0) &&
- pgStatXactCommit == 0 && pgStatXactRollback == 0 &&
- !have_function_stats)
- return;
+ if (area == NULL ||
+ (!have_table_stats && !have_function_stats &&
+ !have_mydatabase_stats && !have_shdatabase_stats &&
+ pgStatXactCommit == 0 && pgStatXactRollback == 0 &&
+ checksum_failures != NULL))
+ return 0;
- /*
- * Don't send a message unless it's been at least PGSTAT_STAT_INTERVAL
- * msec since we last sent one, or the caller wants to force stats out.
- */
now = GetCurrentTransactionStopTimestamp();
- if (!force &&
- !TimestampDifferenceExceeds(last_report, now, PGSTAT_STAT_INTERVAL))
- return;
- last_report = now;
-
- /*
- * Destroy pgStatTabHash before we start invalidating PgStat_TableEntry
- * entries it points to. (Should we fail partway through the loop below,
- * it's okay to have removed the hashtable already --- the only
- * consequence is we'd get multiple entries for the same table in the
- * pgStatTabList, and that's safe.)
- */
- if (pgStatTabHash)
- hash_destroy(pgStatTabHash);
- pgStatTabHash = NULL;
- /*
- * Scan through the TabStatusArray struct(s) to find tables that actually
- * have counts, and build messages to send. We have to separate shared
- * relations from regular ones because the databaseid field in the message
- * header has to depend on that.
- */
- regular_msg.m_databaseid = MyDatabaseId;
- shared_msg.m_databaseid = InvalidOid;
- regular_msg.m_nentries = 0;
- shared_msg.m_nentries = 0;
-
- for (tsa = pgStatTabList; tsa != NULL; tsa = tsa->tsa_next)
+ if (nowait)
{
- for (i = 0; i < tsa->tsa_used; i++)
+ /*
+ * Don't flush stats unless it's the time. Returns time to wait in
+ * milliseconds.
+ */
+ if (now < next_flush)
{
- PgStat_TableStatus *entry = &tsa->tsa_entries[i];
- PgStat_MsgTabstat *this_msg;
- PgStat_TableEntry *this_ent;
+ /* Record the oldest pending update if not yet. */
+ if (pending_since == 0)
+ pending_since = now;
- /* Shouldn't have any pending transaction-dependent counts */
- Assert(entry->trans == NULL);
+ /* now < next_flush here */
+ return (next_flush - now) / 1000;
+ }
- /*
- * Ignore entries that didn't accumulate any actual counts, such
- * as indexes that were opened by the planner but not used.
- */
- if (memcmp(&entry->t_counts, &all_zeroes,
- sizeof(PgStat_TableCounts)) == 0)
- continue;
+ /*
+ * Don't keep pending updates longer than PGSTAT_STAT_MAX_INTERVAL.
+ */
+ if (pending_since > 0)
+ {
+ TimestampDifference(pending_since, now, &secs, &usecs);
+ elapsed = secs * 1000 + usecs / 1000;
- /*
- * OK, insert data into the appropriate message, and send if full.
- */
- this_msg = entry->t_shared ? &shared_msg : ®ular_msg;
- this_ent = &this_msg->m_entry[this_msg->m_nentries];
- this_ent->t_id = entry->t_id;
- memcpy(&this_ent->t_counts, &entry->t_counts,
- sizeof(PgStat_TableCounts));
- if (++this_msg->m_nentries >= PGSTAT_NUM_TABENTRIES)
- {
- pgstat_send_tabstat(this_msg);
- this_msg->m_nentries = 0;
- }
+ if (elapsed > PGSTAT_STAT_MAX_INTERVAL)
+ nowait = false;
}
- /* zero out PgStat_TableStatus structs after use */
- MemSet(tsa->tsa_entries, 0,
- tsa->tsa_used * sizeof(PgStat_TableStatus));
- tsa->tsa_used = 0;
}
- /*
- * Send partial messages. Make sure that any pending xact commit/abort
- * gets counted, even if there are no table stats to send.
- */
- if (regular_msg.m_nentries > 0 ||
- pgStatXactCommit > 0 || pgStatXactRollback > 0)
- pgstat_send_tabstat(®ular_msg);
- if (shared_msg.m_nentries > 0)
- pgstat_send_tabstat(&shared_msg);
-
- /* Now, send function statistics */
- pgstat_send_funcstats();
-}
+ /* Flush out individual stats tables */
+ dbent = pgstat_get_db_entry(MyDatabaseId, false, nowait, false);
+ tables_handle = dbent->tables;
+ functions_handle = dbent->functions;
+ dshash_release_lock(pgStatDBHash, dbent);
-/*
- * Subroutine for pgstat_report_stat: finish and send a tabstat message
- */
+ /* dbent is no longer usable but indicates it was acquired */
+ if (dbent)
+ {
+ process_shared_tables =
+ pgstat_flush_tabstats(MyDatabaseId, tables_handle, nowait);
+ pgstat_flush_funcstats(functions_handle, nowait);
+ }
+ else
+ {
+ /* uncertain whether shared table stats exists, try it */
+ process_shared_tables = true;
+ }
+
+ /* update database-side stats */
+ pgstat_flush_checksum_failure(nowait);
+ pgstat_flush_dbstats(false, nowait); /* MyDatabase */
+
+ if (process_shared_tables)
+ {
+ /* shared tables found, process them */
+ dbent = pgstat_get_db_entry(InvalidOid, false, nowait, false);
+ tables_handle = dbent->tables;
+ dshash_release_lock(pgStatDBHash, dbent);
+
+ if (dbent)
+ pgstat_flush_tabstats(InvalidOid, tables_handle, nowait);
+ }
+ pgstat_flush_dbstats(true, nowait); /* Shared tables */
+
+ /* Publish the last flush time */
+ LWLockAcquire(StatsLock, LW_EXCLUSIVE);
+ if (shared_globalStats->stats_timestamp < now)
+ shared_globalStats->stats_timestamp = now;
+ LWLockRelease(StatsLock);
+
+ /* Record how long we are keeping pending updates. */
+ if (have_table_stats || have_function_stats ||
+ have_mydatabase_stats || have_shdatabase_stats ||
+ checksum_failures != NULL)
+ {
+ /* Preserve the first value */
+ if (pending_since == 0)
+ pending_since = now;
+
+ /*
+ * It's possible that the retry interval is longer than the limit by
+ * PGSTAT_STAT_MAX_INTERVAL. We don't bother that since it's not so
+ * much.
+ */
+ return PGSTAT_STAT_RETRY_INTERVAL;
+ }
+
+ /* Set the next time to update stats */
+ next_flush = now + PGSTAT_STAT_MIN_INTERVAL * 1000;
+ pending_since = 0;
+
+ return 0;
+}
+
+
+/*
+ * pgstat_flush_dbstats: Flushes database stats out to shared statistics.
+ *
+ * If nowait is true, returns immediately if required lock was not acquired.
+ */
static void
-pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg)
+pgstat_flush_dbstats(bool shared, bool nowait)
{
- int n;
- int len;
+ PgStat_StatDBEntry *dbent;
+ PgStat_TableCounts *s;
- /* It's unlikely we'd get here with no socket, but maybe not impossible */
- if (pgStatSock == PGINVALID_SOCKET)
- return;
+ if (shared)
+ {
+ if (!have_shdatabase_stats)
+ return;
+ dbent = pgstat_get_db_entry(InvalidOid, false, nowait, false);
+ if (!dbent)
+ return;
- /*
- * Report and reset accumulated xact commit/rollback and I/O timings
- * whenever we send a normal tabstat message
- */
- if (OidIsValid(tsmsg->m_databaseid))
+ s = &pgStatSharedDatabaseStats;
+ have_shdatabase_stats = false;
+ }
+ else
+ {
+ if (!have_mydatabase_stats)
+ return;
+ dbent = pgstat_get_db_entry(MyDatabaseId, false, nowait, false);
+ if (!dbent)
+ return;
+
+ s = &pgStatMyDatabaseStats;
+ have_mydatabase_stats = false;
+ }
+
+ /* We got the database entry, update database-wide stats */
+ LWLockAcquire(&dbent->lock, LW_EXCLUSIVE);
+ dbent->counts.n_tuples_returned += s->t_tuples_returned;
+ dbent->counts.n_tuples_fetched += s->t_tuples_fetched;
+ dbent->counts.n_tuples_inserted += s->t_tuples_inserted;
+ dbent->counts.n_tuples_updated += s->t_tuples_updated;
+ dbent->counts.n_tuples_deleted += s->t_tuples_deleted;
+ dbent->counts.n_blocks_fetched += s->t_blocks_fetched;
+ dbent->counts.n_blocks_hit += s->t_blocks_hit;
+
+ if (!shared)
{
- tsmsg->m_xact_commit = pgStatXactCommit;
- tsmsg->m_xact_rollback = pgStatXactRollback;
- tsmsg->m_block_read_time = pgStatBlockReadTime;
- tsmsg->m_block_write_time = pgStatBlockWriteTime;
+ dbent->counts.n_xact_commit += pgStatXactCommit;
+ dbent->counts.n_xact_rollback += pgStatXactRollback;
+ dbent->counts.n_block_read_time += pgStatBlockReadTime;
+ dbent->counts.n_block_write_time += pgStatBlockWriteTime;
pgStatXactCommit = 0;
pgStatXactRollback = 0;
pgStatBlockReadTime = 0;
pgStatBlockWriteTime = 0;
}
- else
+ LWLockRelease(&dbent->lock);
+
+ dshash_release_lock(pgStatDBHash, dbent);
+}
+
+/*
+ * pgstat_flush_tabstats: Flushes table stats out to shared statistics.
+ *
+ * If nowait is true, returns false if required lock was not acquired
+ * immediately. In that case, unapplied table stats updates are left alone in
+ * pgStatTables to wait for the next chance. cxt holds some dshash related
+ * values that we want to carry around while updating shared stats.
+ *
+ * Returns true if entries for another database is found in pgStatTables.
+ */
+static bool
+pgstat_flush_tabstats(Oid dbid, dshash_table_handle tabhandle, bool nowait)
+{
+ static const PgStat_TableCounts all_zeroes;
+
+ HASH_SEQ_STATUS scan;
+ PgStat_TableStatus *bestat;
+ dshash_table *tabhash;
+ bool anotherdb_found = false;
+
+ /* nothing to do, just return */
+ if (!have_table_stats)
+ return false;
+
+ have_table_stats = false;
+
+ tabhash = dshash_attach(area, &dsh_tblparams, tabhandle, 0);
+
+ /*
+ * Scan through the pgStatTables to find tables that actually have counts,
+ * and try flushing it out to shared stats.
+ */
+ hash_seq_init(&scan, pgStatTables);
+ while ((bestat = (PgStat_TableStatus *) hash_seq_search(&scan)) != NULL)
{
- tsmsg->m_xact_commit = 0;
- tsmsg->m_xact_rollback = 0;
- tsmsg->m_block_read_time = 0;
- tsmsg->m_block_write_time = 0;
+ bool remove_entry = false;
+
+ /*
+ * Ignore entries that didn't accumulate any actual counts, such as
+ * indexes that were opened by the planner but not used.
+ */
+ if (memcmp(&bestat->t_counts, &all_zeroes,
+ sizeof(PgStat_TableCounts)) == 0)
+ remove_entry = true;
+ /* Ignore entries of databases other than our current target */
+ else if (dbid != (bestat->t_shared ? InvalidOid : MyDatabaseId))
+ anotherdb_found = true;
+ else if (pgstat_update_tabentry(tabhash, bestat, nowait))
+ {
+ PgStat_TableCounts *s;
+
+ if (dbid == bestat->t_shared)
+ {
+ s = &pgStatSharedDatabaseStats;
+ have_shdatabase_stats = true;
+ }
+ else
+ {
+ s = &pgStatMyDatabaseStats;
+ have_mydatabase_stats = true;
+ }
+
+ /* database count is applied at once later */
+ s->t_tuples_returned += bestat->t_counts.t_tuples_returned;
+ s->t_tuples_fetched += bestat->t_counts.t_tuples_fetched;
+ s->t_tuples_inserted += bestat->t_counts.t_tuples_inserted;
+ s->t_tuples_updated += bestat->t_counts.t_tuples_updated;
+ s->t_tuples_deleted += bestat->t_counts.t_tuples_deleted;
+ s->t_blocks_fetched += bestat->t_counts.t_blocks_fetched;
+ s->t_blocks_hit += bestat->t_counts.t_blocks_hit;
+
+ remove_entry = true;
+ }
+
+ if (remove_entry)
+ {
+ /*
+ * Reuse of the entry is detected with t_id in pgstat_initstats.
+ * Set invalid value after removal because the value is needed to
+ * remove the entry.
+ */
+ hash_search(pgStatTables, &bestat->t_id, HASH_REMOVE, NULL);
+ bestat->t_id = InvalidOid;
+ }
+ else
+ have_table_stats = true;
}
- n = tsmsg->m_nentries;
- len = offsetof(PgStat_MsgTabstat, m_entry[0]) +
- n * sizeof(PgStat_TableEntry);
+ dshash_detach(tabhash);
- pgstat_setheader(&tsmsg->m_hdr, PGSTAT_MTYPE_TABSTAT);
- pgstat_send(tsmsg, len);
+ return anotherdb_found;
}
+
/*
- * Subroutine for pgstat_report_stat: populate and send a function stat message
+ * pgstat_flush_funcstats: Flushes function stats.
+ *
+ * If nowait is true, returns false on lock failure. Unapplied local hash
+ * entries are left alone.
+ *
+ * Returns true if some entries are left unflushed.
*/
-static void
-pgstat_send_funcstats(void)
+static bool
+pgstat_flush_funcstats(dshash_table_handle funchandle, bool nowait)
{
/* we assume this inits to all zeroes: */
static const PgStat_FunctionCounts all_zeroes;
+ HASH_SEQ_STATUS scan;
+ PgStat_BackendFunctionEntry *bestat;
+ dshash_table *funchash = NULL;
- PgStat_MsgFuncstat msg;
- PgStat_BackendFunctionEntry *entry;
- HASH_SEQ_STATUS fstat;
-
+ /* nothing to do, just return */
if (pgStatFunctions == NULL)
- return;
+ return false;
+
+ have_function_stats = false;
+
+ /* dshash for function stats is created on-demand */
+ if (funchandle == DSM_HANDLE_INVALID)
+ {
+ PgStat_StatDBEntry *dbent =
+ pgstat_get_db_entry(MyDatabaseId, false, false, false);
+
+ Assert(dbent);
+
+ funchash = dshash_create(area, &dsh_funcparams, 0);
+
+ LWLockAcquire(&dbent->lock, LW_EXCLUSIVE);
+ if (dbent->functions == DSM_HANDLE_INVALID)
+ funchandle = dbent->functions =
+ dshash_get_hash_table_handle(funchash);
+ else
+ {
+ /* someone else simultaneously created it, discard mine. */
+ dshash_destroy(funchash);
+ funchandle = dbent->functions;
+ }
+ LWLockRelease(&dbent->lock);
+
+ /* dbent is no longer needed, release it right now */
+ dshash_release_lock(pgStatDBHash, dbent);
+ }
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_FUNCSTAT);
- msg.m_databaseid = MyDatabaseId;
- msg.m_nentries = 0;
+ if (funchash == NULL)
+ funchash = dshash_attach(area, &dsh_funcparams, funchandle, 0);
- hash_seq_init(&fstat, pgStatFunctions);
- while ((entry = (PgStat_BackendFunctionEntry *) hash_seq_search(&fstat)) != NULL)
+ /*
+ * Scan through the pgStatFunctions to find functions that actually have
+ * counts, and try flushing it out to shared stats.
+ */
+ hash_seq_init(&scan, pgStatFunctions);
+ while ((bestat = (PgStat_BackendFunctionEntry *) hash_seq_search(&scan)) != NULL)
{
- PgStat_FunctionEntry *m_ent;
+ bool found;
+ PgStat_StatFuncEntry *shstat = NULL;
- /* Skip it if no counts accumulated since last time */
- if (memcmp(&entry->f_counts, &all_zeroes,
+ /* Skip it if no counts accumulated for it so far */
+ if (memcmp(&bestat->f_counts, &all_zeroes,
sizeof(PgStat_FunctionCounts)) == 0)
continue;
- /* need to convert format of time accumulators */
- m_ent = &msg.m_entry[msg.m_nentries];
- m_ent->f_id = entry->f_id;
- m_ent->f_numcalls = entry->f_counts.f_numcalls;
- m_ent->f_total_time = INSTR_TIME_GET_MICROSEC(entry->f_counts.f_total_time);
- m_ent->f_self_time = INSTR_TIME_GET_MICROSEC(entry->f_counts.f_self_time);
+ shstat = (PgStat_StatFuncEntry *)
+ dshash_find_extended(funchash, (void *) &(bestat->f_id),
+ true, nowait, true, &found);
- if (++msg.m_nentries >= PGSTAT_NUM_FUNCENTRIES)
+ /*
+ * We couldn't acquire lock on the required entry. Leave the local
+ * entry alone.
+ */
+ if (!shstat)
{
- pgstat_send(&msg, offsetof(PgStat_MsgFuncstat, m_entry[0]) +
- msg.m_nentries * sizeof(PgStat_FunctionEntry));
- msg.m_nentries = 0;
+ have_function_stats = true;
+ continue;
}
- /* reset the entry's counts */
- MemSet(&entry->f_counts, 0, sizeof(PgStat_FunctionCounts));
- }
+ /* Initialize if it's new, or add to it. */
+ if (!found)
+ {
+ shstat->functionid = bestat->f_id;
+ shstat->f_numcalls = bestat->f_counts.f_numcalls;
+ shstat->f_total_time =
+ INSTR_TIME_GET_MICROSEC(bestat->f_counts.f_total_time);
+ shstat->f_self_time =
+ INSTR_TIME_GET_MICROSEC(bestat->f_counts.f_self_time);
+ }
+ else
+ {
+ shstat->f_numcalls += bestat->f_counts.f_numcalls;
+ shstat->f_total_time +=
+ INSTR_TIME_GET_MICROSEC(bestat->f_counts.f_total_time);
+ shstat->f_self_time +=
+ INSTR_TIME_GET_MICROSEC(bestat->f_counts.f_self_time);
+ }
+ dshash_release_lock(funchash, shstat);
- if (msg.m_nentries > 0)
- pgstat_send(&msg, offsetof(PgStat_MsgFuncstat, m_entry[0]) +
- msg.m_nentries * sizeof(PgStat_FunctionEntry));
+ /* reset used counts */
+ MemSet(&bestat->f_counts, 0, sizeof(PgStat_FunctionCounts));
+ }
- have_function_stats = false;
+ return have_function_stats;
}
/* ----------
* pgstat_vacuum_stat() -
*
- * Will tell the collector about objects he can get rid of.
+ * Remove objects we can get rid of.
* ----------
*/
void
pgstat_vacuum_stat(void)
{
- HTAB *htab;
- PgStat_MsgTabpurge msg;
- PgStat_MsgFuncpurge f_msg;
- HASH_SEQ_STATUS hstat;
+ HTAB *oidtab;
+ dshash_seq_status dshstat;
PgStat_StatDBEntry *dbentry;
- PgStat_StatTabEntry *tabentry;
- PgStat_StatFuncEntry *funcentry;
- int len;
+ dshash_table_handle tables_handle;
+ dshash_table_handle functions_handle;
- if (pgStatSock == PGINVALID_SOCKET)
+ /* we don't collect stats under standalone mode */
+ if (!IsUnderPostmaster)
return;
- /*
- * If not done for this transaction, read the statistics collector stats
- * file into some hash tables.
- */
- backend_read_statsfile();
-
/*
* Read pg_database and make a list of OIDs of all existing databases
*/
- htab = pgstat_collect_oids(DatabaseRelationId, Anum_pg_database_oid);
+ oidtab = pgstat_collect_oids(DatabaseRelationId, Anum_pg_database_oid);
/*
- * Search the database hash table for dead databases and tell the
- * collector to drop them.
+ * Search the database hash table for dead databases and drop them from
+ * the hash.
*/
- hash_seq_init(&hstat, pgStatDBHash);
- while ((dbentry = (PgStat_StatDBEntry *) hash_seq_search(&hstat)) != NULL)
+
+ dshash_seq_init(&dshstat, pgStatDBHash, false);
+ while ((dbentry = (PgStat_StatDBEntry *) dshash_seq_next(&dshstat)) != NULL)
{
Oid dbid = dbentry->databaseid;
@@ -1054,136 +955,48 @@ pgstat_vacuum_stat(void)
/* the DB entry for shared tables (with InvalidOid) is never dropped */
if (OidIsValid(dbid) &&
- hash_search(htab, (void *) &dbid, HASH_FIND, NULL) == NULL)
+ hash_search(oidtab, (void *) &dbid, HASH_FIND, NULL) == NULL)
pgstat_drop_database(dbid);
}
/* Clean up */
- hash_destroy(htab);
+ dshash_seq_term(&dshstat);
+ hash_destroy(oidtab);
/*
* Lookup our own database entry; if not found, nothing more to do.
+ * MyDatabaseId cannot be removed or the hashes above are not changed, so
+ * we can release the lock just after.
*/
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &MyDatabaseId,
- HASH_FIND, NULL);
- if (dbentry == NULL || dbentry->tables == NULL)
+ dbentry = pgstat_get_db_entry(MyDatabaseId, false, false, false);
+ if (dbentry == NULL)
return;
+ tables_handle = dbentry->tables;
+ functions_handle = dbentry->functions;
+ dshash_release_lock(pgStatDBHash, dbentry);
/*
* Similarly to above, make a list of all known relations in this DB.
*/
- htab = pgstat_collect_oids(RelationRelationId, Anum_pg_class_oid);
-
- /*
- * Initialize our messages table counter to zero
- */
- msg.m_nentries = 0;
-
- /*
- * Check for all tables listed in stats hashtable if they still exist.
- */
- hash_seq_init(&hstat, dbentry->tables);
- while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&hstat)) != NULL)
- {
- Oid tabid = tabentry->tableid;
-
- CHECK_FOR_INTERRUPTS();
-
- if (hash_search(htab, (void *) &tabid, HASH_FIND, NULL) != NULL)
- continue;
-
- /*
- * Not there, so add this table's Oid to the message
- */
- msg.m_tableid[msg.m_nentries++] = tabid;
-
- /*
- * If the message is full, send it out and reinitialize to empty
- */
- if (msg.m_nentries >= PGSTAT_NUM_TABPURGE)
- {
- len = offsetof(PgStat_MsgTabpurge, m_tableid[0])
- + msg.m_nentries * sizeof(Oid);
-
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
- msg.m_databaseid = MyDatabaseId;
- pgstat_send(&msg, len);
-
- msg.m_nentries = 0;
- }
- }
+ oidtab = pgstat_collect_oids(RelationRelationId, Anum_pg_class_oid);
/*
- * Send the rest
+ * Check for all tables listed in stats hash table if they still exist.
+ * Stats cache is useless here so directly search the shared hash.
*/
- if (msg.m_nentries > 0)
- {
- len = offsetof(PgStat_MsgTabpurge, m_tableid[0])
- + msg.m_nentries * sizeof(Oid);
-
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
- msg.m_databaseid = MyDatabaseId;
- pgstat_send(&msg, len);
- }
-
- /* Clean up */
- hash_destroy(htab);
+ pgstat_remove_useless_entries(tables_handle, &dsh_tblparams, oidtab);
+ hash_destroy(oidtab);
/*
- * Now repeat the above steps for functions. However, we needn't bother
- * in the common case where no function stats are being collected.
+ * Repeat the above but we needn't bother in the common case where no
+ * function stats are being collected.
*/
- if (dbentry->functions != NULL &&
- hash_get_num_entries(dbentry->functions) > 0)
+ if (dbentry->functions != DSM_HANDLE_INVALID)
{
- htab = pgstat_collect_oids(ProcedureRelationId, Anum_pg_proc_oid);
-
- pgstat_setheader(&f_msg.m_hdr, PGSTAT_MTYPE_FUNCPURGE);
- f_msg.m_databaseid = MyDatabaseId;
- f_msg.m_nentries = 0;
-
- hash_seq_init(&hstat, dbentry->functions);
- while ((funcentry = (PgStat_StatFuncEntry *) hash_seq_search(&hstat)) != NULL)
- {
- Oid funcid = funcentry->functionid;
-
- CHECK_FOR_INTERRUPTS();
-
- if (hash_search(htab, (void *) &funcid, HASH_FIND, NULL) != NULL)
- continue;
-
- /*
- * Not there, so add this function's Oid to the message
- */
- f_msg.m_functionid[f_msg.m_nentries++] = funcid;
-
- /*
- * If the message is full, send it out and reinitialize to empty
- */
- if (f_msg.m_nentries >= PGSTAT_NUM_FUNCPURGE)
- {
- len = offsetof(PgStat_MsgFuncpurge, m_functionid[0])
- + f_msg.m_nentries * sizeof(Oid);
-
- pgstat_send(&f_msg, len);
-
- f_msg.m_nentries = 0;
- }
- }
-
- /*
- * Send the rest
- */
- if (f_msg.m_nentries > 0)
- {
- len = offsetof(PgStat_MsgFuncpurge, m_functionid[0])
- + f_msg.m_nentries * sizeof(Oid);
-
- pgstat_send(&f_msg, len);
- }
-
- hash_destroy(htab);
+ oidtab = pgstat_collect_oids(ProcedureRelationId, Anum_pg_proc_oid);
+ pgstat_remove_useless_entries(functions_handle, &dsh_funcparams,
+ oidtab);
+ hash_destroy(oidtab);
}
}
@@ -1212,7 +1025,7 @@ pgstat_collect_oids(Oid catalogid, AttrNumber anum_oid)
hash_ctl.entrysize = sizeof(Oid);
hash_ctl.hcxt = CurrentMemoryContext;
htab = hash_create("Temporary table of OIDs",
- PGSTAT_TAB_HASH_SIZE,
+ PGSTAT_TABLE_HASH_SIZE,
&hash_ctl,
HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
@@ -1239,65 +1052,96 @@ pgstat_collect_oids(Oid catalogid, AttrNumber anum_oid)
}
-/* ----------
- * pgstat_drop_database() -
+/*
+ * pgstat_remove_useless_entries - Remove entries no loner exists from per
+ * table/function dshashes.
*
- * Tell the collector that we just dropped a database.
- * (If the message gets lost, we will still clean the dead DB eventually
- * via future invocations of pgstat_vacuum_stat().)
- * ----------
+ * Scan the dshash specified by dshhandle removing entries that are not in
+ * oidtab. oidtab is destroyed before returning.
*/
void
-pgstat_drop_database(Oid databaseid)
+pgstat_remove_useless_entries(const dshash_table_handle dshhandle,
+ const dshash_parameters *dshparams,
+ HTAB *oidtab)
{
- PgStat_MsgDropdb msg;
+ dshash_table *dshtable;
+ dshash_seq_status dshstat;
+ void *ent;
- if (pgStatSock == PGINVALID_SOCKET)
- return;
+ dshtable = dshash_attach(area, dshparams, dshhandle, 0);
+ dshash_seq_init(&dshstat, dshtable, true);
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DROPDB);
- msg.m_databaseid = databaseid;
- pgstat_send(&msg, sizeof(msg));
-}
+ while ((ent = dshash_seq_next(&dshstat)) != NULL)
+ {
+ CHECK_FOR_INTERRUPTS();
+
+ /* The first member of the entries must be Oid */
+ if (hash_search(oidtab, ent, HASH_FIND, NULL) != NULL)
+ continue;
+
+ /* Not there, so purge this entry */
+ dshash_delete_current(&dshstat);
+ }
+ /* clean up */
+ dshash_seq_term(&dshstat);
+ dshash_detach(dshtable);
+}
/* ----------
- * pgstat_drop_relation() -
+ * pgstat_drop_database() -
*
- * Tell the collector that we just dropped a relation.
- * (If the message gets lost, we will still clean the dead entry eventually
- * via future invocations of pgstat_vacuum_stat().)
+ * Remove entry for the database that we just dropped.
*
- * Currently not used for lack of any good place to call it; we rely
- * entirely on pgstat_vacuum_stat() to clean out stats for dead rels.
+ * If some stats are flushed after this, this entry will be re-created but we
+ * will still clean the dead DB eventually via future invocations of
+ * pgstat_vacuum_stat().
* ----------
*/
-#ifdef NOT_USED
void
-pgstat_drop_relation(Oid relid)
+pgstat_drop_database(Oid databaseid)
{
- PgStat_MsgTabpurge msg;
- int len;
+ PgStat_StatDBEntry *dbentry;
+
+ Assert(OidIsValid(databaseid));
+
+ if (!IsUnderPostmaster || !pgStatDBHash)
+ return;
+
+ /*
+ * Lookup the database, removal needs exclusive lock.
+ */
+ dbentry = pgstat_get_db_entry(databaseid, true, false, false);
- if (pgStatSock == PGINVALID_SOCKET)
+ if (dbentry == NULL)
return;
- msg.m_tableid[0] = relid;
- msg.m_nentries = 1;
+ /* found, remove it */
- len = offsetof(PgStat_MsgTabpurge, m_tableid[0]) + sizeof(Oid);
+ /* Remove table/function stats dshash first. */
+ if (dbentry->tables != DSM_HANDLE_INVALID)
+ {
+ dshash_table *tbl =
+ dshash_attach(area, &dsh_tblparams, dbentry->tables, 0);
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
- msg.m_databaseid = MyDatabaseId;
- pgstat_send(&msg, len);
-}
-#endif /* NOT_USED */
+ dshash_destroy(tbl);
+ }
+ if (dbentry->functions != DSM_HANDLE_INVALID)
+ {
+ dshash_table *tbl =
+ dshash_attach(area, &dsh_funcparams, dbentry->functions, 0);
+
+ dshash_destroy(tbl);
+ }
+
+ dshash_delete_entry(pgStatDBHash, (void *) dbentry);
+}
/* ----------
* pgstat_reset_counters() -
*
- * Tell the statistics collector to reset counters for our database.
+ * Reset counters for our database.
*
* Permission checking for this function is managed through the normal
* GRANT system.
@@ -1306,20 +1150,30 @@ pgstat_drop_relation(Oid relid)
void
pgstat_reset_counters(void)
{
- PgStat_MsgResetcounter msg;
+ PgStat_StatDBEntry *dbentry;
+
+ if (!pgStatDBHash)
+ return;
- if (pgStatSock == PGINVALID_SOCKET)
+ /*
+ * Lookup the database in the hash table. Nothing to do if not there.
+ * This function works on the dbentry, so we cannot release it earlier.
+ */
+ dbentry = pgstat_get_db_entry(MyDatabaseId, false, false, false);
+ if (!dbentry)
return;
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETCOUNTER);
- msg.m_databaseid = MyDatabaseId;
- pgstat_send(&msg, sizeof(msg));
+ /* Reset database-level stats. */
+ reset_dbentry_counters(dbentry);
+
+ dshash_release_lock(pgStatDBHash, dbentry);
+
}
/* ----------
* pgstat_reset_shared_counters() -
*
- * Tell the statistics collector to reset cluster-wide shared counters.
+ * Reset cluster-wide shared counters.
*
* Permission checking for this function is managed through the normal
* GRANT system.
@@ -1328,29 +1182,37 @@ pgstat_reset_counters(void)
void
pgstat_reset_shared_counters(const char *target)
{
- PgStat_MsgResetsharedcounter msg;
-
- if (pgStatSock == PGINVALID_SOCKET)
- return;
-
+ /* Reset the archiver statistics for the cluster. */
if (strcmp(target, "archiver") == 0)
- msg.m_resettarget = RESET_ARCHIVER;
+ {
+ TimestampTz now = GetCurrentTimestamp();
+
+ LWLockAcquire(StatsLock, LW_EXCLUSIVE);
+ MemSet(shared_archiverStats, 0, sizeof(*shared_archiverStats));
+ shared_archiverStats->stat_reset_timestamp = now;
+ LWLockRelease(StatsLock);
+ }
+ /* Reset the bgwriter statistics for the cluster. */
else if (strcmp(target, "bgwriter") == 0)
- msg.m_resettarget = RESET_BGWRITER;
+ {
+ TimestampTz now = GetCurrentTimestamp();
+
+ LWLockAcquire(StatsLock, LW_EXCLUSIVE);
+ MemSet(shared_globalStats, 0, sizeof(*shared_globalStats));
+ shared_globalStats->stat_reset_timestamp = now;
+ LWLockRelease(StatsLock);
+ }
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("unrecognized reset target: \"%s\"", target),
errhint("Target must be \"archiver\" or \"bgwriter\".")));
-
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETSHAREDCOUNTER);
- pgstat_send(&msg, sizeof(msg));
}
/* ----------
* pgstat_reset_single_counter() -
*
- * Tell the statistics collector to reset a single counter.
+ * Reset a single counter.
*
* Permission checking for this function is managed through the normal
* GRANT system.
@@ -1359,17 +1221,39 @@ pgstat_reset_shared_counters(const char *target)
void
pgstat_reset_single_counter(Oid objoid, PgStat_Single_Reset_Type type)
{
- PgStat_MsgResetsinglecounter msg;
+ PgStat_StatDBEntry *dbentry;
+ TimestampTz ts;
+ dshash_table *t;
- if (pgStatSock == PGINVALID_SOCKET)
- return;
+ dbentry = pgstat_get_db_entry(MyDatabaseId, false, false, false);
+ Assert(dbentry);
+
+ /* Set the reset timestamp for the whole database */
+ ts = GetCurrentTimestamp();
+ LWLockAcquire(&dbentry->lock, LW_EXCLUSIVE);
+ dbentry->stat_reset_timestamp = ts;
+ LWLockRelease(&dbentry->lock);
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETSINGLECOUNTER);
- msg.m_databaseid = MyDatabaseId;
- msg.m_resettype = type;
- msg.m_objectid = objoid;
+ /*
+ * MyDatabaseId cannot be removed or the hashes above are not changed, so
+ * we can release the lock right now.
+ */
+ dshash_release_lock(pgStatDBHash, dbentry);
+
+ /* Remove object if it exists, ignore if not */
+ if (type == RESET_TABLE)
+ {
+ t = dshash_attach(area, &dsh_tblparams, dbentry->tables, 0);
+ dshash_delete_key(t, (void *) &objoid);
+ dshash_detach(t);
+ }
- pgstat_send(&msg, sizeof(msg));
+ if (type == RESET_FUNCTION && dbentry->functions != DSM_HANDLE_INVALID)
+ {
+ t = dshash_attach(area, &dsh_funcparams, dbentry->functions, 0);
+ dshash_delete_key(t, (void *) &objoid);
+ dshash_detach(t);
+ }
}
/* ----------
@@ -1383,48 +1267,87 @@ pgstat_reset_single_counter(Oid objoid, PgStat_Single_Reset_Type type)
void
pgstat_report_autovac(Oid dboid)
{
- PgStat_MsgAutovacStart msg;
+ PgStat_StatDBEntry *dbentry;
+ TimestampTz ts;
- if (pgStatSock == PGINVALID_SOCKET)
+ /* return if we are not collecting stats */
+ if (!area)
return;
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_AUTOVAC_START);
- msg.m_databaseid = dboid;
- msg.m_start_time = GetCurrentTimestamp();
+ ts = GetCurrentTimestamp();
+
+ /*
+ * Store the last autovacuum time in the database's hash table entry.
+ */
+ dbentry = pgstat_get_db_entry(dboid, false, false, true);
+ Assert(!dbentry);
+
+ LWLockAcquire(&dbentry->lock, LW_EXCLUSIVE);
+ dbentry->last_autovac_time = ts;
+ LWLockRelease(&dbentry->lock);
- pgstat_send(&msg, sizeof(msg));
+ dshash_release_lock(pgStatDBHash, dbentry);
}
/* ---------
* pgstat_report_vacuum() -
*
- * Tell the collector about the table we just vacuumed.
+ * Report about the table we just vacuumed.
* ---------
*/
void
pgstat_report_vacuum(Oid tableoid, bool shared,
PgStat_Counter livetuples, PgStat_Counter deadtuples)
{
- PgStat_MsgVacuum msg;
+ Oid dboid;
+ PgStat_StatDBEntry *dbentry;
+ PgStat_StatTabEntry *tabentry;
+ dshash_table_handle table_handle;
+ dshash_table *table;
+ TimestampTz ts;
- if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
+ /* return if we are not collecting stats */
+ if (!area)
return;
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_VACUUM);
- msg.m_databaseid = shared ? InvalidOid : MyDatabaseId;
- msg.m_tableoid = tableoid;
- msg.m_autovacuum = IsAutoVacuumWorkerProcess();
- msg.m_vacuumtime = GetCurrentTimestamp();
- msg.m_live_tuples = livetuples;
- msg.m_dead_tuples = deadtuples;
- pgstat_send(&msg, sizeof(msg));
+ dboid = shared ? InvalidOid : MyDatabaseId;
+
+ /*
+ * Store the data in the table's hash table entry. The dshash table cannot
+ * be destroyed meanwhile, so release the dbent right now.
+ */
+ dbentry = pgstat_get_db_entry(dboid, false, false, true);
+ Assert(dbentry);
+ table_handle = dbentry->tables;
+ dshash_release_lock(pgStatDBHash, dbentry);
+
+ ts = GetCurrentTimestamp();
+
+ table = dshash_attach(area, &dsh_tblparams, table_handle, 0);
+ tabentry = pgstat_get_tab_entry(table, tableoid, true);
+
+ tabentry->n_live_tuples = livetuples;
+ tabentry->n_dead_tuples = deadtuples;
+
+ if (IsAutoVacuumWorkerProcess())
+ {
+ tabentry->autovac_vacuum_timestamp = ts;
+ tabentry->autovac_vacuum_count++;
+ }
+ else
+ {
+ tabentry->vacuum_timestamp = ts;
+ tabentry->vacuum_count++;
+ }
+ dshash_release_lock(table, tabentry);
+ dshash_detach(table);
}
/* --------
* pgstat_report_analyze() -
*
- * Tell the collector about the table we just analyzed.
+ * Report about the table we just analyzed.
*
* Caller must provide new live- and dead-tuples estimates, as well as a
* flag indicating whether to reset the changes_since_analyze counter.
@@ -1435,9 +1358,14 @@ pgstat_report_analyze(Relation rel,
PgStat_Counter livetuples, PgStat_Counter deadtuples,
bool resetcounter)
{
- PgStat_MsgAnalyze msg;
+ Oid dboid;
+ PgStat_StatDBEntry *dbentry;
+ PgStat_StatTabEntry *tabentry;
+ dshash_table_handle table_handle;
+ dshash_table *table;
- if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
+ /* return if we are not collecting stats */
+ if (!area)
return;
/*
@@ -1445,10 +1373,10 @@ pgstat_report_analyze(Relation rel,
* already inserted and/or deleted rows in the target table. ANALYZE will
* have counted such rows as live or dead respectively. Because we will
* report our counts of such rows at transaction end, we should subtract
- * off these counts from what we send to the collector now, else they'll
- * be double-counted after commit. (This approach also ensures that the
- * collector ends up with the right numbers if we abort instead of
- * committing.)
+ * off these counts from what is already written to shared stats now, else
+ * they'll be double-counted after commit. (This approach also ensures
+ * that the shared stats ends up with the right numbers if we abort
+ * instead of committing.)
*/
if (rel->pgstat_info != NULL)
{
@@ -1466,84 +1394,125 @@ pgstat_report_analyze(Relation rel,
deadtuples = Max(deadtuples, 0);
}
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_ANALYZE);
- msg.m_databaseid = rel->rd_rel->relisshared ? InvalidOid : MyDatabaseId;
- msg.m_tableoid = RelationGetRelid(rel);
- msg.m_autovacuum = IsAutoVacuumWorkerProcess();
- msg.m_resetcounter = resetcounter;
- msg.m_analyzetime = GetCurrentTimestamp();
- msg.m_live_tuples = livetuples;
- msg.m_dead_tuples = deadtuples;
- pgstat_send(&msg, sizeof(msg));
+ dboid = rel->rd_rel->relisshared ? InvalidOid : MyDatabaseId;
+
+ /*
+ * Store the data in the table's hash table entry. The dshash table cannot
+ * be destroyed meanwhile, so release the dbent right now.
+ */
+ dbentry = pgstat_get_db_entry(dboid, false, false, true);
+ Assert(dbentry);
+ table_handle = dbentry->tables;
+ dshash_release_lock(pgStatDBHash, dbentry);
+
+ table = dshash_attach(area, &dsh_tblparams, table_handle, 0);
+ tabentry = pgstat_get_tab_entry(table, RelationGetRelid(rel), true);
+
+ tabentry->n_live_tuples = livetuples;
+ tabentry->n_dead_tuples = deadtuples;
+
+ /*
+ * If commanded, reset changes_since_analyze to zero. This forgets any
+ * changes that were committed while the ANALYZE was in progress, but we
+ * have no good way to estimate how many of those there were.
+ */
+ if (resetcounter)
+ tabentry->changes_since_analyze = 0;
+
+ if (IsAutoVacuumWorkerProcess())
+ {
+ tabentry->autovac_analyze_timestamp = GetCurrentTimestamp();
+ tabentry->autovac_analyze_count++;
+ }
+ else
+ {
+ tabentry->analyze_timestamp = GetCurrentTimestamp();
+ tabentry->analyze_count++;
+ }
+
+ dshash_release_lock(table, tabentry);
+ dshash_detach(table);
}
/* --------
* pgstat_report_recovery_conflict() -
*
- * Tell the collector about a Hot Standby recovery conflict.
+ * Report a Hot Standby recovery conflict.
* --------
*/
void
pgstat_report_recovery_conflict(int reason)
{
- PgStat_MsgRecoveryConflict msg;
+ PgStat_StatDBEntry *dbentry;
- if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
+ /* return if we are not collecting stats */
+ if (!area)
return;
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RECOVERYCONFLICT);
- msg.m_databaseid = MyDatabaseId;
- msg.m_reason = reason;
- pgstat_send(&msg, sizeof(msg));
-}
-
-/* --------
- * pgstat_report_deadlock() -
- *
- * Tell the collector about a deadlock detected.
- * --------
- */
-void
-pgstat_report_deadlock(void)
-{
- PgStat_MsgDeadlock msg;
+ dbentry = pgstat_get_db_entry(MyDatabaseId, false, false, false);
+ Assert(dbentry);
- if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
- return;
+ LWLockAcquire(&dbentry->lock, LW_EXCLUSIVE);
+ switch (reason)
+ {
+ case PROCSIG_RECOVERY_CONFLICT_DATABASE:
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DEADLOCK);
- msg.m_databaseid = MyDatabaseId;
- pgstat_send(&msg, sizeof(msg));
+ /*
+ * Since we drop the information about the database as soon as it
+ * replicates, there is no point in counting these conflicts.
+ */
+ break;
+ case PROCSIG_RECOVERY_CONFLICT_TABLESPACE:
+ dbentry->counts.n_conflict_tablespace++;
+ break;
+ case PROCSIG_RECOVERY_CONFLICT_LOCK:
+ dbentry->counts.n_conflict_lock++;
+ break;
+ case PROCSIG_RECOVERY_CONFLICT_SNAPSHOT:
+ dbentry->counts.n_conflict_snapshot++;
+ break;
+ case PROCSIG_RECOVERY_CONFLICT_BUFFERPIN:
+ dbentry->counts.n_conflict_bufferpin++;
+ break;
+ case PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK:
+ dbentry->counts.n_conflict_startup_deadlock++;
+ break;
+ }
+ LWLockRelease(&dbentry->lock);
+ dshash_release_lock(pgStatDBHash, dbentry);
}
-
/* --------
- * pgstat_report_checksum_failures_in_db() -
+ * pgstat_report_deadlock() -
*
- * Tell the collector about one or more checksum failures.
+ * Report a deadlock detected.
* --------
*/
void
-pgstat_report_checksum_failures_in_db(Oid dboid, int failurecount)
+pgstat_report_deadlock(void)
{
- PgStat_MsgChecksumFailure msg;
+ PgStat_StatDBEntry *dbentry;
- if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
+ /* return if we are not collecting stats */
+ if (!area)
return;
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_CHECKSUMFAILURE);
- msg.m_databaseid = dboid;
- msg.m_failurecount = failurecount;
- msg.m_failure_time = GetCurrentTimestamp();
+ dbentry = pgstat_get_db_entry(MyDatabaseId, false, false, false);
+ Assert(dbentry);
- pgstat_send(&msg, sizeof(msg));
+ LWLockAcquire(&dbentry->lock, LW_EXCLUSIVE);
+ dbentry->counts.n_deadlocks++;
+ LWLockRelease(&dbentry->lock);
+
+ dshash_release_lock(pgStatDBHash, dbentry);
}
+
/* --------
* pgstat_report_checksum_failure() -
*
- * Tell the collector about a checksum failure.
+ * Reports about a checksum failure.
* --------
*/
void
@@ -1555,60 +1524,153 @@ pgstat_report_checksum_failure(void)
/* --------
* pgstat_report_tempfile() -
*
- * Tell the collector about a temporary file.
+ * Report a temporary file.
* --------
*/
void
pgstat_report_tempfile(size_t filesize)
{
- PgStat_MsgTempFile msg;
+ PgStat_StatDBEntry *dbentry;
- if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
+ /* return if we are not collecting stats */
+ if (!area)
return;
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TEMPFILE);
- msg.m_databaseid = MyDatabaseId;
- msg.m_filesize = filesize;
- pgstat_send(&msg, sizeof(msg));
+ dbentry = pgstat_get_db_entry(MyDatabaseId, false, false, false);
+ Assert(dbentry);
+
+ if (filesize > 0) /* Is there a case where filesize is really 0? */
+ {
+ LWLockAcquire(&dbentry->lock, LW_EXCLUSIVE);
+ dbentry->counts.n_temp_bytes += filesize; /* needs check overflow */
+ dbentry->counts.n_temp_files++;
+ LWLockRelease(&dbentry->lock);
+ }
+
+ dshash_release_lock(pgStatDBHash, dbentry);
}
-/* ----------
- * pgstat_ping() -
+/* --------
+ * pgstat_report_checksum_failures_in_db(dboid, failure_count) -
*
- * Send some junk data to the collector to increase traffic.
- * ----------
+ * Reports about one or more checksum failures.
+ * --------
*/
void
-pgstat_ping(void)
+pgstat_report_checksum_failures_in_db(Oid dboid, int failurecount)
{
- PgStat_MsgDummy msg;
+ PgStat_StatDBEntry *dbentry;
+ ChecksumFailureEnt *failent = NULL;
+
+ /* return if we are not active */
+ if (!area)
+ return;
+
+ /* add accumulated count to the parameter */
+ if (checksum_failures != NULL)
+ {
+ failent = hash_search(checksum_failures, &dboid, HASH_FIND, NULL);
+ if (failent)
+ failurecount += failent->count;
+ }
+
+ if (failurecount == 0)
+ return;
+
+ dbentry = pgstat_get_db_entry(MyDatabaseId, false, true, false);
+
+ if (!dbentry)
+ {
+ /* failed to acquire shared entry, store the number locally */
+ if (!failent)
+ {
+ bool found;
+
+ if (!checksum_failures)
+ {
+ HASHCTL ctl;
+
+ ctl.keysize = sizeof(Oid);
+ ctl.entrysize = sizeof(ChecksumFailureEnt);
+ checksum_failures =
+ hash_create("pgstat checksum failure count hash",
+ 32, &ctl, HASH_ELEM | HASH_BLOBS);
+ }
+
+ failent = hash_search(checksum_failures, &dboid, HASH_ENTER,
+ &found);
- if (pgStatSock == PGINVALID_SOCKET)
+ if (!found)
+ nchecksum_failures++;
+ }
+
+ failent->count = failurecount;
return;
+ }
+
+ /* We have a chance to flush immediately */
+ LWLockAcquire(&dbentry->lock, LW_EXCLUSIVE);
+ dbentry->counts.n_checksum_failures += failurecount;
+ LWLockRelease(&dbentry->lock);
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DUMMY);
- pgstat_send(&msg, sizeof(msg));
+ dshash_release_lock(pgStatDBHash, dbentry);
+
+ if (checksum_failures)
+ {
+ /* Remove the entry and the hash if it gets empty */
+ hash_search(checksum_failures, &dboid, HASH_REMOVE, NULL);
+
+ if (failent != NULL && --nchecksum_failures < 1)
+ {
+ hash_destroy(checksum_failures);
+ checksum_failures = NULL;
+ }
+ }
}
-/* ----------
- * pgstat_send_inquiry() -
+/*
+ * flush checkpoint failure count for all databases
*
- * Notify collector that we need fresh data.
- * ----------
+ * Returns true if some entries are left unflushed.
*/
static void
-pgstat_send_inquiry(TimestampTz clock_time, TimestampTz cutoff_time, Oid databaseid)
+pgstat_flush_checksum_failure(bool nowait)
{
- PgStat_MsgInquiry msg;
+ HASH_SEQ_STATUS stat;
+ ChecksumFailureEnt *ent;
+ PgStat_StatDBEntry *dbentry;
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_INQUIRY);
- msg.clock_time = clock_time;
- msg.cutoff_time = cutoff_time;
- msg.databaseid = databaseid;
- pgstat_send(&msg, sizeof(msg));
-}
+ if (checksum_failures == NULL)
+ return;
+
+ hash_seq_init(&stat, checksum_failures);
+ while ((ent = (ChecksumFailureEnt *) hash_seq_search(&stat)) != NULL)
+ {
+ dbentry = pgstat_get_db_entry(ent->dboid, false, nowait, true);
+ if (dbentry)
+ {
+ /* update database stats */
+ LWLockAcquire(&dbentry->lock, LW_EXCLUSIVE);
+ dbentry->counts.n_checksum_failures += ent->count;
+ LWLockRelease(&dbentry->lock);
+
+ hash_search(checksum_failures, &ent->dboid, HASH_REMOVE, NULL);
+
+ dshash_release_lock(pgStatDBHash, dbentry);
+ nchecksum_failures--;
+ }
+ }
+
+ /* The hash is empty, destroy it. */
+ if (nchecksum_failures < 1)
+ {
+ hash_destroy(checksum_failures);
+ checksum_failures = NULL;
+ }
+ return;
+}
/*
* Initialize function call usage data.
@@ -1739,8 +1801,7 @@ pgstat_end_function_usage(PgStat_FunctionCallUsage *fcu, bool finalize)
*
* We assume that a relcache entry's pgstat_info field is zeroed by
* relcache.c when the relcache entry is made; thereafter it is long-lived
- * data. We can avoid repeated searches of the TabStatus arrays when the
- * same relation is touched repeatedly within a transaction.
+ * data.
* ----------
*/
void
@@ -1760,7 +1821,8 @@ pgstat_initstats(Relation rel)
return;
}
- if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
+ /* return if we are not collecting stats */
+ if (!area)
{
/* We're not counting at all */
rel->pgstat_info = NULL;
@@ -1779,85 +1841,45 @@ pgstat_initstats(Relation rel)
rel->pgstat_info = get_tabstat_entry(rel_id, rel->rd_rel->relisshared);
}
+
/*
* get_tabstat_entry - find or create a PgStat_TableStatus entry for rel
*/
static PgStat_TableStatus *
get_tabstat_entry(Oid rel_id, bool isshared)
{
- TabStatHashEntry *hash_entry;
PgStat_TableStatus *entry;
- TabStatusArray *tsa;
bool found;
/*
* Create hash table if we don't have it already.
*/
- if (pgStatTabHash == NULL)
+ if (pgStatTables == NULL)
{
HASHCTL ctl;
- memset(&ctl, 0, sizeof(ctl));
+ MemSet(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(Oid);
- ctl.entrysize = sizeof(TabStatHashEntry);
+ ctl.entrysize = sizeof(PgStat_TableStatus);
- pgStatTabHash = hash_create("pgstat TabStatusArray lookup hash table",
- TABSTAT_QUANTUM,
- &ctl,
- HASH_ELEM | HASH_BLOBS);
+ pgStatTables = hash_create("Table stat entries",
+ PGSTAT_TABLE_HASH_SIZE,
+ &ctl,
+ HASH_ELEM | HASH_BLOBS);
}
/*
* Find an entry or create a new one.
*/
- hash_entry = hash_search(pgStatTabHash, &rel_id, HASH_ENTER, &found);
+ entry = hash_search(pgStatTables, &rel_id, HASH_ENTER, &found);
if (!found)
{
- /* initialize new entry with null pointer */
- hash_entry->tsa_entry = NULL;
- }
-
- /*
- * If entry is already valid, we're done.
- */
- if (hash_entry->tsa_entry)
- return hash_entry->tsa_entry;
-
- /*
- * Locate the first pgStatTabList entry with free space, making a new list
- * entry if needed. Note that we could get an OOM failure here, but if so
- * we have left the hashtable and the list in a consistent state.
- */
- if (pgStatTabList == NULL)
- {
- /* Set up first pgStatTabList entry */
- pgStatTabList = (TabStatusArray *)
- MemoryContextAllocZero(TopMemoryContext,
- sizeof(TabStatusArray));
- }
-
- tsa = pgStatTabList;
- while (tsa->tsa_used >= TABSTAT_QUANTUM)
- {
- if (tsa->tsa_next == NULL)
- tsa->tsa_next = (TabStatusArray *)
- MemoryContextAllocZero(TopMemoryContext,
- sizeof(TabStatusArray));
- tsa = tsa->tsa_next;
+ entry->t_shared = isshared;
+ entry->trans = NULL;
+ MemSet(&entry->t_counts, 0, sizeof(PgStat_TableCounts));
}
- /*
- * Allocate a PgStat_TableStatus entry within this list entry. We assume
- * the entry was already zeroed, either at creation or after last use.
- */
- entry = &tsa->tsa_entries[tsa->tsa_used++];
- entry->t_id = rel_id;
- entry->t_shared = isshared;
-
- /*
- * Now we can fill the entry in pgStatTabHash.
- */
- hash_entry->tsa_entry = entry;
+ have_table_stats = true;
return entry;
}
@@ -1866,26 +1888,16 @@ get_tabstat_entry(Oid rel_id, bool isshared)
* find_tabstat_entry - find any existing PgStat_TableStatus entry for rel
*
* If no entry, return NULL, don't create a new one
- *
- * Note: if we got an error in the most recent execution of pgstat_report_stat,
- * it's possible that an entry exists but there's no hashtable entry for it.
- * That's okay, we'll treat this case as "doesn't exist".
*/
PgStat_TableStatus *
find_tabstat_entry(Oid rel_id)
{
- TabStatHashEntry *hash_entry;
-
- /* If hashtable doesn't exist, there are no entries at all */
- if (!pgStatTabHash)
- return NULL;
-
- hash_entry = hash_search(pgStatTabHash, &rel_id, HASH_FIND, NULL);
- if (!hash_entry)
+ /* If hash table doesn't exist, there are no entries at all */
+ if (!pgStatTables)
return NULL;
- /* Note that this step could also return NULL, but that's correct */
- return hash_entry->tsa_entry;
+ return (PgStat_TableStatus *) hash_search(pgStatTables,
+ &rel_id, HASH_FIND, NULL);
}
/*
@@ -2315,9 +2327,9 @@ AtPrepare_PgStat(void)
* Clean up after successful PREPARE.
*
* All we need do here is unlink the transaction stats state from the
- * nontransactional state. The nontransactional action counts will be
- * reported to the stats collector immediately, while the effects on live
- * and dead tuple counts are preserved in the 2PC state file.
+ * nontransactional state. The nontransactional action counts will be reported
+ * immediately, while the effects on live and dead tuple counts are preserved
+ * in the 2PC state file.
*
* Note: AtEOXact_PgStat is not called during PREPARE.
*/
@@ -2415,91 +2427,248 @@ pgstat_twophase_postabort(TransactionId xid, uint16 info,
}
-/* ----------
- * pgstat_fetch_stat_dbentry() -
+/*
+ * snapshot_statentry() - Common routine for functions
+ * pgstat_fetch_stat_*entry()
*
- * Support function for the SQL-callable pgstat* functions. Returns
- * the collected statistics for one database or NULL. NULL doesn't mean
- * that the database doesn't exist, it is just not yet known by the
- * collector, so the caller is better off to report ZERO instead.
- * ----------
+ * Returns the pointer to a snapshot of a shared entry for the key or NULL if
+ * not found. Returned snapshots are stable during the current transaction or
+ * until pgstat_clear_snapshot() is called.
+ *
+ * Created snapshots are stored in HTAB *snapshot_hash. If not created yet, it
+ * is created using snapshot_hash_name, snapshot_hash_entsize.
+ *
+ * *table_hash points to dshash_table. If not yet attached, it is attached
+ * using table_hash_params and table_hash_handle.
*/
-PgStat_StatDBEntry *
-pgstat_fetch_stat_dbentry(Oid dbid)
+static void *
+snapshot_statentry(const Oid key, const char *snapshot_hash_name,
+ const int snapshot_hash_entsize,
+ const dshash_table_handle table_hash_handle,
+ const dshash_parameters *table_hash_params,
+ HTAB **snapshot_hash, dshash_table **table_hash)
{
+ PgStat_snapshot *lentry = NULL;
+ size_t table_hash_keysize = table_hash_params->key_size;
+ size_t table_hash_entrysize = table_hash_params->entry_size;
+ bool found;
+
+ /*
+ * We don't want so frequent update of stats snapshot. Keep it at least
+ * for PGSTAT_STAT_MIN_INTERVAL ms. Not postpone but just ignore the cue.
+ */
+ if (clear_snapshot)
+ {
+ clear_snapshot = false;
+
+ if (pgStatSnapshotContext &&
+ snapshot_globalStats.stats_timestamp <
+ GetCurrentStatementStartTimestamp() -
+ PGSTAT_STAT_MIN_INTERVAL * 1000)
+ {
+ MemoryContextReset(pgStatSnapshotContext);
+
+ /* Reset variables */
+ global_snapshot_is_valid = false;
+ pgStatSnapshotContext = NULL;
+ pgStatLocalHash = NULL;
+
+ pgstat_setup_memcxt();
+ *snapshot_hash = NULL;
+ }
+ }
+
/*
- * If not done for this transaction, read the statistics collector stats
- * file into some hash tables.
+ * Create new hash, with rather arbitrary initial number of entries since
+ * we don't know how this hash will grow.
*/
- backend_read_statsfile();
+ if (!*snapshot_hash)
+ {
+ HASHCTL ctl;
+
+ /*
+ * Create the hash in the stats context
+ *
+ * The entry is prepended by common header part represented by
+ * PgStat_snapshot.
+ */
+
+ ctl.keysize = table_hash_keysize;
+ ctl.entrysize =
+ offsetof(PgStat_snapshot, body) + snapshot_hash_entsize;
+ ctl.hcxt = pgStatSnapshotContext;
+ *snapshot_hash = hash_create(snapshot_hash_name, 32, &ctl,
+ HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
+ }
+
+ lentry = hash_search(*snapshot_hash, &key, HASH_ENTER, &found);
/*
- * Lookup the requested database; return NULL if not found
+ * Refer shared hash if not found in the local hash. We return up-to-date
+ * entries outside a transaction so do the same even if the snapshot is
+ * found.
*/
- return (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &dbid,
- HASH_FIND, NULL);
+ if (!found || !IsTransactionState())
+ {
+ void *sentry;
+
+ /* attach shared hash if not given, leave it alone for later use */
+ if (!*table_hash)
+ {
+ MemoryContext oldcxt;
+
+ Assert(table_hash_handle != DSM_HANDLE_INVALID);
+ oldcxt = MemoryContextSwitchTo(pgStatSnapshotContext);
+ *table_hash =
+ dshash_attach(area, table_hash_params, table_hash_handle, NULL);
+ MemoryContextSwitchTo(oldcxt);
+ }
+
+ sentry = dshash_find(*table_hash, &key, false);
+
+ if (sentry)
+ {
+ /*
+ * In transaction state, it is obvious that we should create local
+ * cache entries for consistency. If we are not, we return an
+ * up-to-date entry. Having said that, we need a local copy since
+ * dshash entry must be released immediately. We share the same
+ * local hash entry for the purpose.
+ */
+ memcpy(&lentry->body, sentry, table_hash_entrysize);
+ dshash_release_lock(*table_hash, sentry);
+
+ /* then zero out the local additional space if any */
+ if (table_hash_entrysize < snapshot_hash_entsize)
+ MemSet((char *) &lentry->body + table_hash_entrysize, 0,
+ snapshot_hash_entsize - table_hash_entrysize);
+ }
+
+ lentry->negative = !sentry;
+ }
+
+ if (lentry->negative)
+ return NULL;
+
+ return &lentry->body;
}
+/* ----------
+ * pgstat_fetch_stat_dbentry_snapshot() -
+ *
+ * Find database stats entry on backends. The returned entries are cached
+ * until transaction end or pgstat_clear_snapshot() is called.
+ */
+PgStat_StatDBEntry *
+pgstat_fetch_stat_dbentry(Oid dbid)
+{
+ /* should be called from backends */
+ Assert(IsUnderPostmaster);
+
+ /* If not done for this transaction, take a snapshot of global stats */
+ pgstat_snapshot_global_stats();
+
+ /* caller doesn't have a business with snapshot-local members */
+ return (PgStat_StatDBEntry *)
+ snapshot_statentry(dbid,
+ "local database stats", /* snapshot hash name */
+ sizeof(PgStat_StatDBEntry), /* snapshot ent size */
+ DSM_HANDLE_INVALID, /* dshash handle */
+ &dsh_dbparams, /* dshash params */
+ &pgStatLocalHash, /* snapshot hash */
+ &pgStatDBHash); /* shared hash */
+}
+
/* ----------
* pgstat_fetch_stat_tabentry() -
*
* Support function for the SQL-callable pgstat* functions. Returns
- * the collected statistics for one table or NULL. NULL doesn't mean
+ * the activity statistics for one table or NULL. NULL doesn't mean
* that the table doesn't exist, it is just not yet known by the
- * collector, so the caller is better off to report ZERO instead.
+ * activity statistics facilities, so the caller is better off to
+ * report ZERO instead.
* ----------
*/
PgStat_StatTabEntry *
pgstat_fetch_stat_tabentry(Oid relid)
{
- Oid dbid;
PgStat_StatDBEntry *dbentry;
PgStat_StatTabEntry *tabentry;
- /*
- * If not done for this transaction, read the statistics collector stats
- * file into some hash tables.
- */
- backend_read_statsfile();
+ /* Lookup our database, then look in its table hash table. */
+ dbentry = pgstat_fetch_stat_dbentry(MyDatabaseId);
+ if (dbentry == NULL)
+ return NULL;
- /*
- * Lookup our database, then look in its table hash table.
- */
- dbid = MyDatabaseId;
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &dbid,
- HASH_FIND, NULL);
- if (dbentry != NULL && dbentry->tables != NULL)
- {
- tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
- (void *) &relid,
- HASH_FIND, NULL);
- if (tabentry)
- return tabentry;
- }
+ tabentry = pgstat_fetch_stat_tabentry_snapshot(dbentry, relid);
+ if (tabentry != NULL)
+ return tabentry;
/*
* If we didn't find it, maybe it's a shared table.
*/
- dbid = InvalidOid;
- dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- (void *) &dbid,
- HASH_FIND, NULL);
- if (dbentry != NULL && dbentry->tables != NULL)
- {
- tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
- (void *) &relid,
- HASH_FIND, NULL);
- if (tabentry)
- return tabentry;
- }
+ dbentry = pgstat_fetch_stat_dbentry(InvalidOid);
+ if (dbentry == NULL)
+ return NULL;
+
+ tabentry = pgstat_fetch_stat_tabentry_snapshot(dbentry, relid);
+ if (tabentry != NULL)
+ return tabentry;
return NULL;
}
+/* ----------
+ * pgstat_fetch_stat_tabentry_snapshot() -
+ *
+ * Find table stats entry on backends in dbent. The returned entry is cached
+ * until transaction end or pgstat_clear_snapshot() is called.
+ */
+PgStat_StatTabEntry *
+pgstat_fetch_stat_tabentry_snapshot(PgStat_StatDBEntry *dbent, Oid reloid)
+{
+ return (PgStat_StatTabEntry *)
+ snapshot_statentry(reloid,
+ "table stats snapshot", /* snapshot hash name */
+ sizeof(PgStat_StatTabEntry), /* snapshot ent size */
+ dbent->tables, /* dshash handle */
+ &dsh_tblparams, /* dshash params */
+ &dbent->snapshot_tables, /* snapshot hash */
+ &dbent->dshash_tables); /* shared hash */
+}
+
+
+/* ----------
+ * pgstat_copy_index_counters() -
+ *
+ * Support function for index swapping. Sets index counters to specified
+ * place.
+ * ----------
+ */
+void
+pgstat_copy_index_counters(Oid relid, PgStat_TableStatus *dst)
+{
+ PgStat_StatTabEntry *tabentry;
+
+ /* No point fetching tabentry when dst is NULL */
+ if (!dst)
+ return;
+
+ tabentry = pgstat_fetch_stat_tabentry(relid);
+
+ if (!tabentry)
+ return;
+
+ dst->t_counts.t_numscans = tabentry->numscans;
+ dst->t_counts.t_tuples_returned = tabentry->tuples_returned;
+ dst->t_counts.t_tuples_fetched = tabentry->tuples_fetched;
+ dst->t_counts.t_blocks_fetched = tabentry->blocks_fetched;
+ dst->t_counts.t_blocks_hit = tabentry->blocks_hit;
+}
+
+
/* ----------
* pgstat_fetch_stat_funcentry() -
*
@@ -2513,49 +2682,103 @@ pgstat_fetch_stat_funcentry(Oid func_id)
PgStat_StatDBEntry *dbentry;
PgStat_StatFuncEntry *funcentry = NULL;
- /* load the stats file if needed */
- backend_read_statsfile();
-
- /* Lookup our database, then find the requested function. */
+ /* Lookup our database, then find the requested function */
dbentry = pgstat_fetch_stat_dbentry(MyDatabaseId);
- if (dbentry != NULL && dbentry->functions != NULL)
- {
- funcentry = (PgStat_StatFuncEntry *) hash_search(dbentry->functions,
- (void *) &func_id,
- HASH_FIND, NULL);
- }
+ if (dbentry == NULL)
+ return NULL;
+
+ funcentry = pgstat_fetch_stat_funcentry_snapshot(dbentry, func_id);
return funcentry;
}
-
/* ----------
- * pgstat_fetch_stat_beentry() -
- *
- * Support function for the SQL-callable pgstat* functions. Returns
- * our local copy of the current-activity entry for one backend.
+ * pgstat_fetch_stat_funcentry_snapshot() -
*
- * NB: caller is responsible for a check if the user is permitted to see
- * this info (especially the querystring).
- * ----------
+ * Find function stats entry on backends in dbent. The returned entry is
+ * cached until transaction end or pgstat_clear_snapshot() is called.
*/
-PgBackendStatus *
-pgstat_fetch_stat_beentry(int beid)
+static PgStat_StatFuncEntry *
+pgstat_fetch_stat_funcentry_snapshot(PgStat_StatDBEntry *dbent, Oid funcid)
{
- pgstat_read_current_status();
+ /* should be called from backends */
+ Assert(IsUnderPostmaster);
- if (beid < 1 || beid > localNumBackends)
+ if (dbent->functions == DSM_HANDLE_INVALID)
return NULL;
- return &localBackendStatusTable[beid - 1].backendStatus;
+ return (PgStat_StatFuncEntry *)
+ snapshot_statentry(funcid,
+ "function stats snapshot", /* snapshot hash name */
+ sizeof(PgStat_StatFuncEntry), /* snapshot ent size */
+ dbent->functions, /* dshash handle */
+ &dsh_funcparams, /* dshash params */
+ &dbent->snapshot_functions, /* snapshot hash */
+ &dbent->dshash_functions); /* shared hash */
}
-
-/* ----------
- * pgstat_fetch_stat_local_beentry() -
- *
- * Like pgstat_fetch_stat_beentry() but with locally computed additions (like
- * xid and xmin values of the backend)
+/*
+ * pgstat_snapshot_global_stats() -
+ *
+ * Makes a snapshot of global stats if not done yet. They will be kept until
+ * subsequent call of pgstat_clear_snapshot() or the end of the current
+ * memory context (typically TopTransactionContext).
+ */
+static void
+pgstat_snapshot_global_stats(void)
+{
+ MemoryContext oldcontext;
+
+ pgstat_attach_shared_stats();
+
+ /* Nothing to do if already done */
+ if (global_snapshot_is_valid)
+ return;
+
+ oldcontext = MemoryContextSwitchTo(pgStatSnapshotContext);
+
+ LWLockAcquire(StatsLock, LW_SHARED);
+ memcpy(&snapshot_globalStats, shared_globalStats,
+ sizeof(PgStat_GlobalStats));
+
+ memcpy(&snapshot_archiverStats, shared_archiverStats,
+ sizeof(PgStat_ArchiverStats));
+ LWLockRelease(StatsLock);
+
+ global_snapshot_is_valid = true;
+
+ MemoryContextSwitchTo(oldcontext);
+
+ return;
+}
+
+/* ----------
+ * pgstat_fetch_stat_beentry() -
+ *
+ * Support function for the SQL-callable pgstat* functions. Returns
+ * our local copy of the current-activity entry for one backend.
+ *
+ * NB: caller is responsible for a check if the user is permitted to see
+ * this info (especially the querystring).
+ * ----------
+ */
+PgBackendStatus *
+pgstat_fetch_stat_beentry(int beid)
+{
+ pgstat_read_current_status();
+
+ if (beid < 1 || beid > localNumBackends)
+ return NULL;
+
+ return &localBackendStatusTable[beid - 1].backendStatus;
+}
+
+
+/* ----------
+ * pgstat_fetch_stat_local_beentry() -
+ *
+ * Like pgstat_fetch_stat_beentry() but with locally computed additions (like
+ * xid and xmin values of the backend)
*
* NB: caller is responsible for a check if the user is permitted to see
* this info (especially the querystring).
@@ -2599,9 +2822,10 @@ pgstat_fetch_stat_numbackends(void)
PgStat_ArchiverStats *
pgstat_fetch_stat_archiver(void)
{
- backend_read_statsfile();
+ /* If not done for this transaction, take a stats snapshot */
+ pgstat_snapshot_global_stats();
- return &archiverStats;
+ return &snapshot_archiverStats;
}
@@ -2616,9 +2840,10 @@ pgstat_fetch_stat_archiver(void)
PgStat_GlobalStats *
pgstat_fetch_global(void)
{
- backend_read_statsfile();
+ /* If not done for this transaction, take a stats snapshot */
+ pgstat_snapshot_global_stats();
- return &globalStats;
+ return &snapshot_globalStats;
}
@@ -2832,8 +3057,8 @@ pgstat_initialize(void)
MyBEEntry = &BackendStatusArray[MaxBackends + MyAuxProcType];
}
- /* Set up a process-exit hook to clean up */
- on_shmem_exit(pgstat_beshutdown_hook, 0);
+ /* need to be called before dsm shutdown */
+ before_shmem_exit(pgstat_beshutdown_hook, 0);
}
/* ----------
@@ -3009,12 +3234,16 @@ pgstat_bestart(void)
/* Update app name to current GUC setting */
if (application_name)
pgstat_report_appname(application_name);
+
+
+ /* attach shared database stats area */
+ pgstat_attach_shared_stats();
}
/*
* Shut down a single backend's statistics reporting at process exit.
*
- * Flush any remaining statistics counts out to the collector.
+ * Flush any remaining statistics counts out to shared stats.
* Without this, operations triggered during backend exit (such as
* temp table deletions) won't be counted.
*
@@ -3027,7 +3256,7 @@ pgstat_beshutdown_hook(int code, Datum arg)
/*
* If we got as far as discovering our own database ID, we can report what
- * we did to the collector. Otherwise, we'd be sending an invalid
+ * we did to the shares stats. Otherwise, we'd be sending an invalid
* database ID, so forget it. (This means that accesses to pg_database
* during failed backend starts might never get counted.)
*/
@@ -3044,6 +3273,8 @@ pgstat_beshutdown_hook(int code, Datum arg)
beentry->st_procpid = 0; /* mark invalid */
PGSTAT_END_WRITE_ACTIVITY(beentry);
+
+ pgstat_detach_shared_stats(true);
}
@@ -3304,7 +3535,8 @@ pgstat_read_current_status(void)
#endif
int i;
- Assert(!pgStatRunningInCollector);
+ Assert(IsUnderPostmaster);
+
if (localBackendStatusTable)
return; /* already done */
@@ -3599,9 +3831,6 @@ pgstat_get_wait_activity(WaitEventActivity w)
case WAIT_EVENT_LOGICAL_LAUNCHER_MAIN:
event_name = "LogicalLauncherMain";
break;
- case WAIT_EVENT_PGSTAT_MAIN:
- event_name = "PgStatMain";
- break;
case WAIT_EVENT_RECOVERY_WAL_ALL:
event_name = "RecoveryWalAll";
break;
@@ -4221,94 +4450,71 @@ pgstat_get_crashed_backend_activity(int pid, char *buffer, int buflen)
/* ----------
- * pgstat_setheader() -
- *
- * Set common header fields in a statistics message
- * ----------
- */
-static void
-pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype)
-{
- hdr->m_type = mtype;
-}
-
-
-/* ----------
- * pgstat_send() -
- *
- * Send out one statistics message to the collector
- * ----------
- */
-static void
-pgstat_send(void *msg, int len)
-{
- int rc;
-
- if (pgStatSock == PGINVALID_SOCKET)
- return;
-
- ((PgStat_MsgHdr *) msg)->m_size = len;
-
- /* We'll retry after EINTR, but ignore all other failures */
- do
- {
- rc = send(pgStatSock, msg, len, 0);
- } while (rc < 0 && errno == EINTR);
-
-#ifdef USE_ASSERT_CHECKING
- /* In debug builds, log send failures ... */
- if (rc < 0)
- elog(LOG, "could not send to statistics collector: %m");
-#endif
-}
-
-/* ----------
- * pgstat_send_archiver() -
+ * pgstat_report_archiver() -
*
- * Tell the collector about the WAL file that we successfully
- * archived or failed to archive.
+ * Report archiver statistics
* ----------
*/
void
-pgstat_send_archiver(const char *xlog, bool failed)
+pgstat_report_archiver(const char *xlog, bool failed)
{
- PgStat_MsgArchiver msg;
+ TimestampTz now = GetCurrentTimestamp();
- /*
- * Prepare and send the message
- */
- pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_ARCHIVER);
- msg.m_failed = failed;
- StrNCpy(msg.m_xlog, xlog, sizeof(msg.m_xlog));
- msg.m_timestamp = GetCurrentTimestamp();
- pgstat_send(&msg, sizeof(msg));
+ if (failed)
+ {
+ /* Failed archival attempt */
+ LWLockAcquire(StatsLock, LW_EXCLUSIVE);
+ ++shared_archiverStats->failed_count;
+ memcpy(shared_archiverStats->last_failed_wal, xlog,
+ sizeof(shared_archiverStats->last_failed_wal));
+ shared_archiverStats->last_failed_timestamp = now;
+ LWLockRelease(StatsLock);
+ }
+ else
+ {
+ /* Successful archival operation */
+ LWLockAcquire(StatsLock, LW_EXCLUSIVE);
+ ++shared_archiverStats->archived_count;
+ memcpy(shared_archiverStats->last_archived_wal, xlog,
+ sizeof(shared_archiverStats->last_archived_wal));
+ shared_archiverStats->last_archived_timestamp = now;
+ LWLockRelease(StatsLock);
+ }
}
/* ----------
- * pgstat_send_bgwriter() -
+ * pgstat_report_bgwriter() -
*
- * Send bgwriter statistics to the collector
+ * Report bgwriter statistics
* ----------
*/
void
-pgstat_send_bgwriter(void)
+pgstat_report_bgwriter(void)
{
/* We assume this initializes to zeroes */
- static const PgStat_MsgBgWriter all_zeroes;
+ static const PgStat_BgWriter all_zeroes;
+
+ PgStat_BgWriter *s = &BgWriterStats;
/*
* This function can be called even if nothing at all has happened. In
- * this case, avoid sending a completely empty message to the stats
- * collector.
+ * this case, avoid taking lock for a completely empty message.
*/
- if (memcmp(&BgWriterStats, &all_zeroes, sizeof(PgStat_MsgBgWriter)) == 0)
+ if (memcmp(&BgWriterStats, &all_zeroes, sizeof(PgStat_BgWriter)) == 0)
return;
- /*
- * Prepare and send the message
- */
- pgstat_setheader(&BgWriterStats.m_hdr, PGSTAT_MTYPE_BGWRITER);
- pgstat_send(&BgWriterStats, sizeof(BgWriterStats));
+ LWLockAcquire(StatsLock, LW_EXCLUSIVE);
+ shared_globalStats->timed_checkpoints += s->timed_checkpoints;
+ shared_globalStats->requested_checkpoints += s->requested_checkpoints;
+ shared_globalStats->checkpoint_write_time += s->checkpoint_write_time;
+ shared_globalStats->checkpoint_sync_time += s->checkpoint_sync_time;
+ shared_globalStats->buf_written_checkpoints += s->buf_written_checkpoints;
+ shared_globalStats->buf_written_clean += s->buf_written_clean;
+ shared_globalStats->maxwritten_clean += s->maxwritten_clean;
+ shared_globalStats->buf_written_backend += s->buf_written_backend;
+ shared_globalStats->buf_fsync_backend += s->buf_fsync_backend;
+ shared_globalStats->buf_alloc += s->buf_alloc;
+ LWLockRelease(StatsLock);
/*
* Clear out the statistics buffer, so it can be re-used.
@@ -4317,422 +4523,162 @@ pgstat_send_bgwriter(void)
}
-/* ----------
- * PgstatCollectorMain() -
- *
- * Start up the statistics collector process. This is the body of the
- * postmaster child process.
- *
- * The argc/argv parameters are valid only in EXEC_BACKEND case.
- * ----------
- */
-NON_EXEC_STATIC void
-PgstatCollectorMain(int argc, char *argv[])
+static void
+init_dbentry(PgStat_StatDBEntry *dbentry)
{
- int len;
- PgStat_Msg msg;
- int wr;
-
- /*
- * Ignore all signals usually bound to some action in the postmaster,
- * except SIGHUP and SIGQUIT. Note we don't need a SIGUSR1 handler to
- * support latch operations, because we only use a local latch.
- */
- pqsignal(SIGHUP, SignalHandlerForConfigReload);
- pqsignal(SIGINT, SIG_IGN);
- pqsignal(SIGTERM, SIG_IGN);
- pqsignal(SIGQUIT, SignalHandlerForShutdownRequest);
- pqsignal(SIGALRM, SIG_IGN);
- pqsignal(SIGPIPE, SIG_IGN);
- pqsignal(SIGUSR1, SIG_IGN);
- pqsignal(SIGUSR2, SIG_IGN);
- /* Reset some signals that are accepted by postmaster but not here */
- pqsignal(SIGCHLD, SIG_DFL);
- PG_SETMASK(&UnBlockSig);
-
- MyBackendType = B_STATS_COLLECTOR;
- init_ps_display(NULL);
-
- /*
- * Read in existing stats files or initialize the stats to zero.
- */
- pgStatRunningInCollector = true;
- pgStatDBHash = pgstat_read_statsfiles(InvalidOid, true, true);
-
- /*
- * Loop to process messages until we get SIGQUIT or detect ungraceful
- * death of our parent postmaster.
- *
- * For performance reasons, we don't want to do ResetLatch/WaitLatch after
- * every message; instead, do that only after a recv() fails to obtain a
- * message. (This effectively means that if backends are sending us stuff
- * like mad, we won't notice postmaster death until things slack off a
- * bit; which seems fine.) To do that, we have an inner loop that
- * iterates as long as recv() succeeds. We do check ConfigReloadPending
- * inside the inner loop, which means that such interrupts will get
- * serviced but the latch won't get cleared until next time there is a
- * break in the action.
- */
- for (;;)
- {
- /* Clear any already-pending wakeups */
- ResetLatch(MyLatch);
-
- /*
- * Quit if we get SIGQUIT from the postmaster.
- */
- if (ShutdownRequestPending)
- break;
-
- /*
- * Inner loop iterates as long as we keep getting messages, or until
- * ShutdownRequestPending becomes set.
- */
- while (!ShutdownRequestPending)
- {
- /*
- * Reload configuration if we got SIGHUP from the postmaster.
- */
- if (ConfigReloadPending)
- {
- ConfigReloadPending = false;
- ProcessConfigFile(PGC_SIGHUP);
- }
-
- /*
- * Write the stats file(s) if a new request has arrived that is
- * not satisfied by existing file(s).
- */
- if (pgstat_write_statsfile_needed())
- pgstat_write_statsfiles(false, false);
-
- /*
- * Try to receive and process a message. This will not block,
- * since the socket is set to non-blocking mode.
- *
- * XXX On Windows, we have to force pgwin32_recv to cooperate,
- * despite the previous use of pg_set_noblock() on the socket.
- * This is extremely broken and should be fixed someday.
- */
-#ifdef WIN32
- pgwin32_noblock = 1;
-#endif
-
- len = recv(pgStatSock, (char *) &msg,
- sizeof(PgStat_Msg), 0);
-
-#ifdef WIN32
- pgwin32_noblock = 0;
-#endif
-
- if (len < 0)
- {
- if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
- break; /* out of inner loop */
- ereport(ERROR,
- (errcode_for_socket_access(),
- errmsg("could not read statistics message: %m")));
- }
-
- /*
- * We ignore messages that are smaller than our common header
- */
- if (len < sizeof(PgStat_MsgHdr))
- continue;
-
- /*
- * The received length must match the length in the header
- */
- if (msg.msg_hdr.m_size != len)
- continue;
-
- /*
- * O.K. - we accept this message. Process it.
- */
- switch (msg.msg_hdr.m_type)
- {
- case PGSTAT_MTYPE_DUMMY:
- break;
-
- case PGSTAT_MTYPE_INQUIRY:
- pgstat_recv_inquiry(&msg.msg_inquiry, len);
- break;
-
- case PGSTAT_MTYPE_TABSTAT:
- pgstat_recv_tabstat(&msg.msg_tabstat, len);
- break;
-
- case PGSTAT_MTYPE_TABPURGE:
- pgstat_recv_tabpurge(&msg.msg_tabpurge, len);
- break;
-
- case PGSTAT_MTYPE_DROPDB:
- pgstat_recv_dropdb(&msg.msg_dropdb, len);
- break;
-
- case PGSTAT_MTYPE_RESETCOUNTER:
- pgstat_recv_resetcounter(&msg.msg_resetcounter, len);
- break;
-
- case PGSTAT_MTYPE_RESETSHAREDCOUNTER:
- pgstat_recv_resetsharedcounter(&msg.msg_resetsharedcounter,
- len);
- break;
-
- case PGSTAT_MTYPE_RESETSINGLECOUNTER:
- pgstat_recv_resetsinglecounter(&msg.msg_resetsinglecounter,
- len);
- break;
-
- case PGSTAT_MTYPE_AUTOVAC_START:
- pgstat_recv_autovac(&msg.msg_autovacuum_start, len);
- break;
-
- case PGSTAT_MTYPE_VACUUM:
- pgstat_recv_vacuum(&msg.msg_vacuum, len);
- break;
-
- case PGSTAT_MTYPE_ANALYZE:
- pgstat_recv_analyze(&msg.msg_analyze, len);
- break;
-
- case PGSTAT_MTYPE_ARCHIVER:
- pgstat_recv_archiver(&msg.msg_archiver, len);
- break;
-
- case PGSTAT_MTYPE_BGWRITER:
- pgstat_recv_bgwriter(&msg.msg_bgwriter, len);
- break;
-
- case PGSTAT_MTYPE_FUNCSTAT:
- pgstat_recv_funcstat(&msg.msg_funcstat, len);
- break;
-
- case PGSTAT_MTYPE_FUNCPURGE:
- pgstat_recv_funcpurge(&msg.msg_funcpurge, len);
- break;
-
- case PGSTAT_MTYPE_RECOVERYCONFLICT:
- pgstat_recv_recoveryconflict(&msg.msg_recoveryconflict,
- len);
- break;
-
- case PGSTAT_MTYPE_DEADLOCK:
- pgstat_recv_deadlock(&msg.msg_deadlock, len);
- break;
-
- case PGSTAT_MTYPE_TEMPFILE:
- pgstat_recv_tempfile(&msg.msg_tempfile, len);
- break;
-
- case PGSTAT_MTYPE_CHECKSUMFAILURE:
- pgstat_recv_checksum_failure(&msg.msg_checksumfailure,
- len);
- break;
-
- default:
- break;
- }
- } /* end of inner message-processing loop */
-
- /* Sleep until there's something to do */
-#ifndef WIN32
- wr = WaitLatchOrSocket(MyLatch,
- WL_LATCH_SET | WL_POSTMASTER_DEATH | WL_SOCKET_READABLE,
- pgStatSock, -1L,
- WAIT_EVENT_PGSTAT_MAIN);
-#else
+ dshash_table *tabhash;
- /*
- * Windows, at least in its Windows Server 2003 R2 incarnation,
- * sometimes loses FD_READ events. Waking up and retrying the recv()
- * fixes that, so don't sleep indefinitely. This is a crock of the
- * first water, but until somebody wants to debug exactly what's
- * happening there, this is the best we can do. The two-second
- * timeout matches our pre-9.2 behavior, and needs to be short enough
- * to not provoke "using stale statistics" complaints from
- * backend_read_statsfile.
- */
- wr = WaitLatchOrSocket(MyLatch,
- WL_LATCH_SET | WL_POSTMASTER_DEATH | WL_SOCKET_READABLE | WL_TIMEOUT,
- pgStatSock,
- 2 * 1000L /* msec */ ,
- WAIT_EVENT_PGSTAT_MAIN);
-#endif
+ LWLockInitialize(&dbentry->lock, LWTRANCHE_STATS);
- /*
- * Emergency bailout if postmaster has died. This is to avoid the
- * necessity for manual cleanup of all postmaster children.
- */
- if (wr & WL_POSTMASTER_DEATH)
- break;
- } /* end of outer loop */
+ dbentry->last_autovac_time = 0;
+ dbentry->last_checksum_failure = 0;
+ dbentry->stat_reset_timestamp = 0;
+ dbentry->stats_timestamp = 0;
+ /* initialize the new shared entry */
+ MemSet(&dbentry->counts, 0, sizeof(PgStat_StatDBCounts));
- /*
- * Save the final stats to reuse at next startup.
- */
- pgstat_write_statsfiles(true, true);
+ dbentry->functions = DSM_HANDLE_INVALID;
- exit(0);
+ /* dbentry always has the table hash */
+ tabhash = dshash_create(area, &dsh_tblparams, 0);
+ dbentry->tables = dshash_get_hash_table_handle(tabhash);
+ dshash_detach(tabhash);
}
+
/*
- * Subroutine to clear stats in a database entry
- *
- * Tables and functions hashes are initialized to empty.
+ * Create the filename for a DB stat file; filename is output parameter points
+ * to a character buffer of length len.
*/
static void
-reset_dbentry_counters(PgStat_StatDBEntry *dbentry)
+get_dbstat_filename(bool tempname, Oid databaseid, char *filename, int len)
{
- HASHCTL hash_ctl;
-
- dbentry->n_xact_commit = 0;
- dbentry->n_xact_rollback = 0;
- dbentry->n_blocks_fetched = 0;
- dbentry->n_blocks_hit = 0;
- dbentry->n_tuples_returned = 0;
- dbentry->n_tuples_fetched = 0;
- dbentry->n_tuples_inserted = 0;
- dbentry->n_tuples_updated = 0;
- dbentry->n_tuples_deleted = 0;
- dbentry->last_autovac_time = 0;
- dbentry->n_conflict_tablespace = 0;
- dbentry->n_conflict_lock = 0;
- dbentry->n_conflict_snapshot = 0;
- dbentry->n_conflict_bufferpin = 0;
- dbentry->n_conflict_startup_deadlock = 0;
- dbentry->n_temp_files = 0;
- dbentry->n_temp_bytes = 0;
- dbentry->n_deadlocks = 0;
- dbentry->n_checksum_failures = 0;
- dbentry->last_checksum_failure = 0;
- dbentry->n_block_read_time = 0;
- dbentry->n_block_write_time = 0;
-
- dbentry->stat_reset_timestamp = GetCurrentTimestamp();
- dbentry->stats_timestamp = 0;
-
- memset(&hash_ctl, 0, sizeof(hash_ctl));
- hash_ctl.keysize = sizeof(Oid);
- hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
- dbentry->tables = hash_create("Per-database table",
- PGSTAT_TAB_HASH_SIZE,
- &hash_ctl,
- HASH_ELEM | HASH_BLOBS);
+ int printed;
- hash_ctl.keysize = sizeof(Oid);
- hash_ctl.entrysize = sizeof(PgStat_StatFuncEntry);
- dbentry->functions = hash_create("Per-database function",
- PGSTAT_FUNCTION_HASH_SIZE,
- &hash_ctl,
- HASH_ELEM | HASH_BLOBS);
+ /* NB -- pgstat_reset_remove_files knows about the pattern this uses */
+ printed = snprintf(filename, len, "%s/db_%u.%s",
+ PGSTAT_STAT_PERMANENT_DIRECTORY,
+ databaseid,
+ tempname ? "tmp" : "stat");
+ if (printed >= len)
+ elog(ERROR, "overlength pgstat path");
}
-/*
- * Lookup the hash table entry for the specified database. If no hash
- * table entry exists, initialize it, if the create parameter is true.
- * Else, return NULL.
- */
-static PgStat_StatDBEntry *
-pgstat_get_db_entry(Oid databaseid, bool create)
+
+static void
+reset_tabcount(PgStat_StatTabEntry *ent)
{
- PgStat_StatDBEntry *result;
- bool found;
- HASHACTION action = (create ? HASH_ENTER : HASH_FIND);
+ ent->numscans = 0;
+ ent->tuples_returned = 0;
+ ent->tuples_fetched = 0;
+ ent->tuples_inserted = 0;
+ ent->tuples_updated = 0;
+ ent->tuples_deleted = 0;
+ ent->tuples_hot_updated = 0;
+ ent->n_live_tuples = 0;
+ ent->n_dead_tuples = 0;
+ ent->changes_since_analyze = 0;
+ ent->blocks_fetched = 0;
+ ent->blocks_hit = 0;
+ ent->vacuum_count = 0;
+ ent->autovac_vacuum_count = 0;
+ ent->analyze_count = 0;
+ ent->autovac_analyze_count = 0;
+
+ ent->vacuum_timestamp = 0;
+ ent->autovac_vacuum_timestamp = 0;
+ ent->analyze_timestamp = 0;
+ ent->autovac_analyze_timestamp = 0;
+}
- /* Lookup or create the hash table entry for this database */
- result = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
- &databaseid,
- action, &found);
- if (!create && !found)
- return NULL;
+static void
+reset_dbcount(PgStat_StatDBEntry *ent)
+{
+ TimestampTz ts = GetCurrentTimestamp();
+
+ LWLockAcquire(&ent->lock, LW_EXCLUSIVE);
+
+ ent->counts.n_tuples_returned = 0;
+ ent->counts.n_tuples_fetched = 0;
+ ent->counts.n_tuples_inserted = 0;
+ ent->counts.n_tuples_updated = 0;
+ ent->counts.n_tuples_deleted = 0;
+ ent->counts.n_blocks_fetched = 0;
+ ent->counts.n_blocks_hit = 0;
+ ent->counts.n_xact_commit = 0;
+ ent->counts.n_xact_rollback = 0;
+ ent->counts.n_block_read_time = 0;
+ ent->counts.n_block_write_time = 0;
+ ent->stat_reset_timestamp = ts;
+
+ LWLockRelease(&ent->lock);
+}
- /*
- * If not found, initialize the new one. This creates empty hash tables
- * for tables and functions, too.
- */
- if (!found)
- reset_dbentry_counters(result);
- return result;
+static void
+reset_funccount(PgStat_StatFuncEntry *ent)
+{
+ ent->f_numcalls = 0;
+ ent->f_total_time = 0;
+ ent->f_self_time = 0;
}
/*
- * Lookup the hash table entry for the specified table. If no hash
- * table entry exists, initialize it, if the create parameter is true.
- * Else, return NULL.
+ * Subroutine to clear stats in a database entry
+ *
+ * Reset all counters in the dbentry.
*/
-static PgStat_StatTabEntry *
-pgstat_get_tab_entry(PgStat_StatDBEntry *dbentry, Oid tableoid, bool create)
+static void
+reset_dbentry_counters(PgStat_StatDBEntry *dbentry)
{
- PgStat_StatTabEntry *result;
- bool found;
- HASHACTION action = (create ? HASH_ENTER : HASH_FIND);
-
- /* Lookup or create the hash table entry for this table */
- result = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
- &tableoid,
- action, &found);
-
- if (!create && !found)
- return NULL;
-
- /* If not found, initialize the new one. */
- if (!found)
+ dshash_table *tbl;
+ dshash_seq_status dshstat;
+ PgStat_StatTabEntry *tabent;
+ PgStat_StatFuncEntry *funcent;
+
+ tbl = dshash_attach(area, &dsh_tblparams, dbentry->tables, 0);
+ dshash_seq_init(&dshstat, tbl, true);
+ while ((tabent = dshash_seq_next(&dshstat)) != NULL)
+ reset_tabcount(tabent);
+ dshash_seq_term(&dshstat);
+ dshash_detach(tbl);
+
+ if (dbentry->functions != DSM_HANDLE_INVALID)
{
- result->numscans = 0;
- result->tuples_returned = 0;
- result->tuples_fetched = 0;
- result->tuples_inserted = 0;
- result->tuples_updated = 0;
- result->tuples_deleted = 0;
- result->tuples_hot_updated = 0;
- result->n_live_tuples = 0;
- result->n_dead_tuples = 0;
- result->changes_since_analyze = 0;
- result->blocks_fetched = 0;
- result->blocks_hit = 0;
- result->vacuum_timestamp = 0;
- result->vacuum_count = 0;
- result->autovac_vacuum_timestamp = 0;
- result->autovac_vacuum_count = 0;
- result->analyze_timestamp = 0;
- result->analyze_count = 0;
- result->autovac_analyze_timestamp = 0;
- result->autovac_analyze_count = 0;
+ tbl = dshash_attach(area, &dsh_tblparams, dbentry->functions, 0);
+ dshash_seq_init(&dshstat, tbl, true);
+ while ((funcent = dshash_seq_next(&dshstat)) != NULL)
+ reset_funccount(funcent);
+ dshash_seq_term(&dshstat);
+ dshash_detach(tbl);
}
- return result;
+ reset_dbcount(dbentry);
}
/* ----------
* pgstat_write_statsfiles() -
- * Write the global statistics file, as well as requested DB files.
- *
- * 'permanent' specifies writing to the permanent files not temporary ones.
- * When true (happens only when the collector is shutting down), also remove
- * the temporary files so that backends starting up under a new postmaster
- * can't read old data before the new collector is ready.
- *
- * When 'allDbs' is false, only the requested databases (listed in
- * pending_write_requests) will be written; otherwise, all databases
- * will be written.
+ * Write the global statistics file, as well as DB files.
* ----------
*/
-static void
-pgstat_write_statsfiles(bool permanent, bool allDbs)
+void
+pgstat_write_statsfiles(void)
{
- HASH_SEQ_STATUS hstat;
+ dshash_seq_status hstat;
PgStat_StatDBEntry *dbentry;
FILE *fpout;
int32 format_id;
- const char *tmpfile = permanent ? PGSTAT_STAT_PERMANENT_TMPFILE : pgstat_stat_tmpname;
- const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
+ const char *tmpfile = PGSTAT_STAT_PERMANENT_TMPFILE;
+ const char *statfile = PGSTAT_STAT_PERMANENT_FILENAME;
int rc;
+ /* stats is not initialized yet. just return. */
+ if (StatsShmem->stats_dsa_handle == DSM_HANDLE_INVALID)
+ return;
+
elog(DEBUG2, "writing stats file \"%s\"", statfile);
/*
@@ -4751,7 +4697,7 @@ pgstat_write_statsfiles(bool permanent, bool allDbs)
/*
* Set the timestamp of the stats file.
*/
- globalStats.stats_timestamp = GetCurrentTimestamp();
+ shared_globalStats->stats_timestamp = GetCurrentTimestamp();
/*
* Write the file header --- currently just a format ID.
@@ -4763,32 +4709,29 @@ pgstat_write_statsfiles(bool permanent, bool allDbs)
/*
* Write global stats struct
*/
- rc = fwrite(&globalStats, sizeof(globalStats), 1, fpout);
+ rc = fwrite(shared_globalStats, sizeof(*shared_globalStats), 1, fpout);
(void) rc; /* we'll check for error with ferror */
/*
* Write archiver stats struct
*/
- rc = fwrite(&archiverStats, sizeof(archiverStats), 1, fpout);
+ rc = fwrite(shared_archiverStats, sizeof(*shared_archiverStats), 1, fpout);
(void) rc; /* we'll check for error with ferror */
/*
* Walk through the database table.
*/
- hash_seq_init(&hstat, pgStatDBHash);
- while ((dbentry = (PgStat_StatDBEntry *) hash_seq_search(&hstat)) != NULL)
+ dshash_seq_init(&hstat, pgStatDBHash, false);
+ while ((dbentry = (PgStat_StatDBEntry *) dshash_seq_next(&hstat)) != NULL)
{
/*
* Write out the table and function stats for this DB into the
* appropriate per-DB stat file, if required.
*/
- if (allDbs || pgstat_db_requested(dbentry->databaseid))
- {
- /* Make DB's timestamp consistent with the global stats */
- dbentry->stats_timestamp = globalStats.stats_timestamp;
+ /* Make DB's timestamp consistent with the global stats */
+ dbentry->stats_timestamp = shared_globalStats->stats_timestamp;
- pgstat_write_db_statsfile(dbentry, permanent);
- }
+ pgstat_write_pgStatDBHashfile(dbentry);
/*
* Write out the DB entry. We don't write the tables or functions
@@ -4798,6 +4741,7 @@ pgstat_write_statsfiles(bool permanent, bool allDbs)
rc = fwrite(dbentry, offsetof(PgStat_StatDBEntry, tables), 1, fpout);
(void) rc; /* we'll check for error with ferror */
}
+ dshash_seq_term(&hstat);
/*
* No more output to be done. Close the temp file and replace the old
@@ -4831,53 +4775,19 @@ pgstat_write_statsfiles(bool permanent, bool allDbs)
tmpfile, statfile)));
unlink(tmpfile);
}
-
- if (permanent)
- unlink(pgstat_stat_filename);
-
- /*
- * Now throw away the list of requests. Note that requests sent after we
- * started the write are still waiting on the network socket.
- */
- list_free(pending_write_requests);
- pending_write_requests = NIL;
}
-/*
- * return the filename for a DB stat file; filename is the output buffer,
- * of length len.
- */
-static void
-get_dbstat_filename(bool permanent, bool tempname, Oid databaseid,
- char *filename, int len)
-{
- int printed;
-
- /* NB -- pgstat_reset_remove_files knows about the pattern this uses */
- printed = snprintf(filename, len, "%s/db_%u.%s",
- permanent ? PGSTAT_STAT_PERMANENT_DIRECTORY :
- pgstat_stat_directory,
- databaseid,
- tempname ? "tmp" : "stat");
- if (printed >= len)
- elog(ERROR, "overlength pgstat path");
-}
/* ----------
- * pgstat_write_db_statsfile() -
+ * pgstat_write_pgStatDBHashfile() -
* Write the stat file for a single database.
- *
- * If writing to the permanent file (happens when the collector is
- * shutting down only), remove the temporary file so that backends
- * starting up under a new postmaster can't read the old data before
- * the new collector is ready.
* ----------
*/
static void
-pgstat_write_db_statsfile(PgStat_StatDBEntry *dbentry, bool permanent)
+pgstat_write_pgStatDBHashfile(PgStat_StatDBEntry *dbentry)
{
- HASH_SEQ_STATUS tstat;
- HASH_SEQ_STATUS fstat;
+ dshash_seq_status tstat;
+ dshash_seq_status fstat;
PgStat_StatTabEntry *tabentry;
PgStat_StatFuncEntry *funcentry;
FILE *fpout;
@@ -4886,9 +4796,10 @@ pgstat_write_db_statsfile(PgStat_StatDBEntry *dbentry, bool permanent)
int rc;
char tmpfile[MAXPGPATH];
char statfile[MAXPGPATH];
+ dshash_table *tbl;
- get_dbstat_filename(permanent, true, dbid, tmpfile, MAXPGPATH);
- get_dbstat_filename(permanent, false, dbid, statfile, MAXPGPATH);
+ get_dbstat_filename(true, dbid, tmpfile, MAXPGPATH);
+ get_dbstat_filename(false, dbid, statfile, MAXPGPATH);
elog(DEBUG2, "writing stats file \"%s\"", statfile);
@@ -4915,23 +4826,34 @@ pgstat_write_db_statsfile(PgStat_StatDBEntry *dbentry, bool permanent)
/*
* Walk through the database's access stats per table.
*/
- hash_seq_init(&tstat, dbentry->tables);
- while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&tstat)) != NULL)
+ Assert(dbentry->tables != DSM_HANDLE_INVALID);
+
+ tbl = dshash_attach(area, &dsh_tblparams, dbentry->tables, 0);
+ dshash_seq_init(&tstat, tbl, false);
+ while ((tabentry = (PgStat_StatTabEntry *) dshash_seq_next(&tstat)) != NULL)
{
fputc('T', fpout);
rc = fwrite(tabentry, sizeof(PgStat_StatTabEntry), 1, fpout);
(void) rc; /* we'll check for error with ferror */
}
+ dshash_seq_term(&tstat);
+ dshash_detach(tbl);
/*
* Walk through the database's function stats table.
*/
- hash_seq_init(&fstat, dbentry->functions);
- while ((funcentry = (PgStat_StatFuncEntry *) hash_seq_search(&fstat)) != NULL)
+ if (dbentry->functions != DSM_HANDLE_INVALID)
{
- fputc('F', fpout);
- rc = fwrite(funcentry, sizeof(PgStat_StatFuncEntry), 1, fpout);
- (void) rc; /* we'll check for error with ferror */
+ tbl = dshash_attach(area, &dsh_funcparams, dbentry->functions, 0);
+ dshash_seq_init(&fstat, tbl, false);
+ while ((funcentry = (PgStat_StatFuncEntry *) dshash_seq_next(&fstat)) != NULL)
+ {
+ fputc('F', fpout);
+ rc = fwrite(funcentry, sizeof(PgStat_StatFuncEntry), 1, fpout);
+ (void) rc; /* we'll check for error with ferror */
+ }
+ dshash_seq_term(&fstat);
+ dshash_detach(tbl);
}
/*
@@ -4966,94 +4888,56 @@ pgstat_write_db_statsfile(PgStat_StatDBEntry *dbentry, bool permanent)
tmpfile, statfile)));
unlink(tmpfile);
}
-
- if (permanent)
- {
- get_dbstat_filename(false, false, dbid, statfile, MAXPGPATH);
-
- elog(DEBUG2, "removing temporary stats file \"%s\"", statfile);
- unlink(statfile);
- }
}
+
/* ----------
* pgstat_read_statsfiles() -
*
- * Reads in some existing statistics collector files and returns the
- * databases hash table that is the top level of the data.
+ * Reads in existing activity statistics files into the shared stats hash.
*
- * If 'onlydb' is not InvalidOid, it means we only want data for that DB
- * plus the shared catalogs ("DB 0"). We'll still populate the DB hash
- * table for all databases, but we don't bother even creating table/function
- * hash tables for other databases.
- *
- * 'permanent' specifies reading from the permanent files not temporary ones.
- * When true (happens only when the collector is starting up), remove the
- * files after reading; the in-memory status is now authoritative, and the
- * files would be out of date in case somebody else reads them.
- *
- * If a 'deep' read is requested, table/function stats are read, otherwise
- * the table/function hash tables remain empty.
* ----------
*/
-static HTAB *
-pgstat_read_statsfiles(Oid onlydb, bool permanent, bool deep)
+void
+pgstat_read_statsfiles(void)
{
PgStat_StatDBEntry *dbentry;
PgStat_StatDBEntry dbbuf;
- HASHCTL hash_ctl;
- HTAB *dbhash;
FILE *fpin;
int32 format_id;
bool found;
- const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
-
- /*
- * The tables will live in pgStatLocalContext.
- */
- pgstat_setup_memcxt();
+ const char *statfile = PGSTAT_STAT_PERMANENT_FILENAME;
- /*
- * Create the DB hashtable
- */
- memset(&hash_ctl, 0, sizeof(hash_ctl));
- hash_ctl.keysize = sizeof(Oid);
- hash_ctl.entrysize = sizeof(PgStat_StatDBEntry);
- hash_ctl.hcxt = pgStatLocalContext;
- dbhash = hash_create("Databases hash", PGSTAT_DB_HASH_SIZE, &hash_ctl,
- HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
+ /* shouldn't be called from postmaster */
+ Assert(IsUnderPostmaster);
- /*
- * Clear out global and archiver statistics so they start from zero in
- * case we can't load an existing statsfile.
- */
- memset(&globalStats, 0, sizeof(globalStats));
- memset(&archiverStats, 0, sizeof(archiverStats));
+ elog(DEBUG2, "reading stats file \"%s\"", statfile);
/*
* Set the current timestamp (will be kept only in case we can't load an
* existing statsfile).
*/
- globalStats.stat_reset_timestamp = GetCurrentTimestamp();
- archiverStats.stat_reset_timestamp = globalStats.stat_reset_timestamp;
+ shared_globalStats->stat_reset_timestamp = GetCurrentTimestamp();
+ shared_archiverStats->stat_reset_timestamp =
+ shared_globalStats->stat_reset_timestamp;
/*
* Try to open the stats file. If it doesn't exist, the backends simply
- * return zero for anything and the collector simply starts from scratch
- * with empty counters.
+ * returns zero for anything and the activity statistics simply starts
+ * from scratch with empty counters.
*
- * ENOENT is a possibility if the stats collector is not running or has
- * not yet written the stats file the first time. Any other failure
+ * ENOENT is a possibility if the activity statistics is not running or
+ * has not yet written the stats file the first time. Any other failure
* condition is suspicious.
*/
if ((fpin = AllocateFile(statfile, PG_BINARY_R)) == NULL)
{
if (errno != ENOENT)
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errcode_for_file_access(),
errmsg("could not open statistics file \"%s\": %m",
statfile)));
- return dbhash;
+ return;
}
/*
@@ -5062,7 +4946,7 @@ pgstat_read_statsfiles(Oid onlydb, bool permanent, bool deep)
if (fread(&format_id, 1, sizeof(format_id), fpin) != sizeof(format_id) ||
format_id != PGSTAT_FILE_FORMAT_ID)
{
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"", statfile)));
goto done;
}
@@ -5070,38 +4954,30 @@ pgstat_read_statsfiles(Oid onlydb, bool permanent, bool deep)
/*
* Read global stats struct
*/
- if (fread(&globalStats, 1, sizeof(globalStats), fpin) != sizeof(globalStats))
+ if (fread(shared_globalStats, 1, sizeof(*shared_globalStats), fpin) !=
+ sizeof(*shared_globalStats))
{
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"", statfile)));
- memset(&globalStats, 0, sizeof(globalStats));
+ MemSet(shared_globalStats, 0, sizeof(*shared_globalStats));
goto done;
}
- /*
- * In the collector, disregard the timestamp we read from the permanent
- * stats file; we should be willing to write a temp stats file immediately
- * upon the first request from any backend. This only matters if the old
- * file's timestamp is less than PGSTAT_STAT_INTERVAL ago, but that's not
- * an unusual scenario.
- */
- if (pgStatRunningInCollector)
- globalStats.stats_timestamp = 0;
-
/*
* Read archiver stats struct
*/
- if (fread(&archiverStats, 1, sizeof(archiverStats), fpin) != sizeof(archiverStats))
+ if (fread(shared_archiverStats, 1, sizeof(*shared_archiverStats), fpin) !=
+ sizeof(*shared_archiverStats))
{
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"", statfile)));
- memset(&archiverStats, 0, sizeof(archiverStats));
+ MemSet(shared_archiverStats, 0, sizeof(*shared_archiverStats));
goto done;
}
/*
- * We found an existing collector stats file. Read it and put all the
- * hashtable entries into place.
+ * We found an existing activity statistics file. Read it and put all the
+ * hash table entries into place.
*/
for (;;)
{
@@ -5115,7 +4991,7 @@ pgstat_read_statsfiles(Oid onlydb, bool permanent, bool deep)
if (fread(&dbbuf, 1, offsetof(PgStat_StatDBEntry, tables),
fpin) != offsetof(PgStat_StatDBEntry, tables))
{
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"",
statfile)));
goto done;
@@ -5124,76 +5000,36 @@ pgstat_read_statsfiles(Oid onlydb, bool permanent, bool deep)
/*
* Add to the DB hash
*/
- dbentry = (PgStat_StatDBEntry *) hash_search(dbhash,
- (void *) &dbbuf.databaseid,
- HASH_ENTER,
- &found);
+ dbentry = (PgStat_StatDBEntry *)
+ dshash_find_or_insert(pgStatDBHash, (void *) &dbbuf.databaseid,
+ &found);
+
+ /* don't allow duplicate dbentries */
if (found)
{
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ dshash_release_lock(pgStatDBHash, dbentry);
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"",
statfile)));
goto done;
}
- memcpy(dbentry, &dbbuf, sizeof(PgStat_StatDBEntry));
- dbentry->tables = NULL;
- dbentry->functions = NULL;
+ init_dbentry(dbentry);
+ memcpy(dbentry, &dbbuf,
+ offsetof(PgStat_StatDBEntry, tables));
- /*
- * In the collector, disregard the timestamp we read from the
- * permanent stats file; we should be willing to write a temp
- * stats file immediately upon the first request from any
- * backend.
- */
- if (pgStatRunningInCollector)
- dbentry->stats_timestamp = 0;
-
- /*
- * Don't create tables/functions hashtables for uninteresting
- * databases.
- */
- if (onlydb != InvalidOid)
- {
- if (dbbuf.databaseid != onlydb &&
- dbbuf.databaseid != InvalidOid)
- break;
- }
-
- memset(&hash_ctl, 0, sizeof(hash_ctl));
- hash_ctl.keysize = sizeof(Oid);
- hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
- hash_ctl.hcxt = pgStatLocalContext;
- dbentry->tables = hash_create("Per-database table",
- PGSTAT_TAB_HASH_SIZE,
- &hash_ctl,
- HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
-
- hash_ctl.keysize = sizeof(Oid);
- hash_ctl.entrysize = sizeof(PgStat_StatFuncEntry);
- hash_ctl.hcxt = pgStatLocalContext;
- dbentry->functions = hash_create("Per-database function",
- PGSTAT_FUNCTION_HASH_SIZE,
- &hash_ctl,
- HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
-
- /*
- * If requested, read the data from the database-specific
- * file. Otherwise we just leave the hashtables empty.
- */
- if (deep)
- pgstat_read_db_statsfile(dbentry->databaseid,
- dbentry->tables,
- dbentry->functions,
- permanent);
+ Assert(dbentry->tables != DSM_HANDLE_INVALID);
+ /* Read the data from the database-specific file. */
+ pgstat_read_pgStatDBHashfile(dbentry);
+ dshash_release_lock(pgStatDBHash, dbentry);
break;
case 'E':
goto done;
default:
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"",
statfile)));
goto done;
@@ -5203,59 +5039,49 @@ pgstat_read_statsfiles(Oid onlydb, bool permanent, bool deep)
done:
FreeFile(fpin);
- /* If requested to read the permanent file, also get rid of it. */
- if (permanent)
- {
- elog(DEBUG2, "removing permanent stats file \"%s\"", statfile);
- unlink(statfile);
- }
+ elog(DEBUG2, "removing permanent stats file \"%s\"", statfile);
+ unlink(statfile);
- return dbhash;
+ return;
}
/* ----------
- * pgstat_read_db_statsfile() -
- *
- * Reads in the existing statistics collector file for the given database,
- * filling the passed-in tables and functions hash tables.
- *
- * As in pgstat_read_statsfiles, if the permanent file is requested, it is
- * removed after reading.
+ * pgstat_read_pgStatDBHashfile() -
*
- * Note: this code has the ability to skip storing per-table or per-function
- * data, if NULL is passed for the corresponding hashtable. That's not used
- * at the moment though.
+ * Reads in the at-rest statistics file and create shared statistics
+ * tables. The file is removed after reading.
* ----------
*/
static void
-pgstat_read_db_statsfile(Oid databaseid, HTAB *tabhash, HTAB *funchash,
- bool permanent)
+pgstat_read_pgStatDBHashfile(PgStat_StatDBEntry *dbentry)
{
PgStat_StatTabEntry *tabentry;
PgStat_StatTabEntry tabbuf;
PgStat_StatFuncEntry funcbuf;
PgStat_StatFuncEntry *funcentry;
+ dshash_table *tabhash = NULL;
+ dshash_table *funchash = NULL;
FILE *fpin;
int32 format_id;
bool found;
char statfile[MAXPGPATH];
- get_dbstat_filename(permanent, false, databaseid, statfile, MAXPGPATH);
+ get_dbstat_filename(false, dbentry->databaseid, statfile, MAXPGPATH);
/*
* Try to open the stats file. If it doesn't exist, the backends simply
- * return zero for anything and the collector simply starts from scratch
- * with empty counters.
+ * returns zero for anything and the activity statistics simply starts
+ * from scratch with empty counters.
*
- * ENOENT is a possibility if the stats collector is not running or has
- * not yet written the stats file the first time. Any other failure
+ * ENOENT is a possibility if the activity statistics is not running or
+ * has not yet written the stats file the first time. Any other failure
* condition is suspicious.
*/
if ((fpin = AllocateFile(statfile, PG_BINARY_R)) == NULL)
{
if (errno != ENOENT)
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errcode_for_file_access(),
errmsg("could not open statistics file \"%s\": %m",
statfile)));
@@ -5268,14 +5094,17 @@ pgstat_read_db_statsfile(Oid databaseid, HTAB *tabhash, HTAB *funchash,
if (fread(&format_id, 1, sizeof(format_id), fpin) != sizeof(format_id) ||
format_id != PGSTAT_FILE_FORMAT_ID)
{
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"", statfile)));
goto done;
}
+ /* Create table stats hash */
+ Assert(dbentry->tables != DSM_HANDLE_INVALID);
+
/*
- * We found an existing collector stats file. Read it and put all the
- * hashtable entries into place.
+ * We found an existing statistics file. Read it and put all the hash
+ * table entries into place.
*/
for (;;)
{
@@ -5288,31 +5117,32 @@ pgstat_read_db_statsfile(Oid databaseid, HTAB *tabhash, HTAB *funchash,
if (fread(&tabbuf, 1, sizeof(PgStat_StatTabEntry),
fpin) != sizeof(PgStat_StatTabEntry))
{
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"",
statfile)));
goto done;
}
- /*
- * Skip if table data not wanted.
- */
- if (tabhash == NULL)
- break;
+ if (!tabhash)
+ tabhash = dshash_attach(area, &dsh_tblparams,
+ dbentry->tables, 0);
- tabentry = (PgStat_StatTabEntry *) hash_search(tabhash,
- (void *) &tabbuf.tableid,
- HASH_ENTER, &found);
+ tabentry = (PgStat_StatTabEntry *)
+ dshash_find_or_insert(tabhash,
+ (void *) &tabbuf.tableid, &found);
+ /* don't allow duplicate entries */
if (found)
{
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ dshash_release_lock(tabhash, tabentry);
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"",
statfile)));
goto done;
}
memcpy(tabentry, &tabbuf, sizeof(tabbuf));
+ dshash_release_lock(tabhash, tabentry);
break;
/*
@@ -5322,31 +5152,34 @@ pgstat_read_db_statsfile(Oid databaseid, HTAB *tabhash, HTAB *funchash,
if (fread(&funcbuf, 1, sizeof(PgStat_StatFuncEntry),
fpin) != sizeof(PgStat_StatFuncEntry))
{
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"",
statfile)));
goto done;
}
- /*
- * Skip if function data not wanted.
- */
if (funchash == NULL)
- break;
+ {
+ funchash = dshash_create(area, &dsh_tblparams, 0);
+ dbentry->functions =
+ dshash_get_hash_table_handle(funchash);
+ }
- funcentry = (PgStat_StatFuncEntry *) hash_search(funchash,
- (void *) &funcbuf.functionid,
- HASH_ENTER, &found);
+ funcentry = (PgStat_StatFuncEntry *)
+ dshash_find_or_insert(funchash,
+ (void *) &funcbuf.functionid, &found);
if (found)
{
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ dshash_release_lock(funchash, funcentry);
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"",
statfile)));
goto done;
}
memcpy(funcentry, &funcbuf, sizeof(funcbuf));
+ dshash_release_lock(funchash, funcentry);
break;
/*
@@ -5356,7 +5189,7 @@ pgstat_read_db_statsfile(Oid databaseid, HTAB *tabhash, HTAB *funchash,
goto done;
default:
- ereport(pgStatRunningInCollector ? LOG : WARNING,
+ ereport(LOG,
(errmsg("corrupted statistics file \"%s\"",
statfile)));
goto done;
@@ -5364,292 +5197,38 @@ pgstat_read_db_statsfile(Oid databaseid, HTAB *tabhash, HTAB *funchash,
}
done:
- FreeFile(fpin);
-
- if (permanent)
- {
- elog(DEBUG2, "removing permanent stats file \"%s\"", statfile);
- unlink(statfile);
- }
-}
-
-/* ----------
- * pgstat_read_db_statsfile_timestamp() -
- *
- * Attempt to determine the timestamp of the last db statfile write.
- * Returns true if successful; the timestamp is stored in *ts.
- *
- * This needs to be careful about handling databases for which no stats file
- * exists, such as databases without a stat entry or those not yet written:
- *
- * - if there's a database entry in the global file, return the corresponding
- * stats_timestamp value.
- *
- * - if there's no db stat entry (e.g. for a new or inactive database),
- * there's no stats_timestamp value, but also nothing to write so we return
- * the timestamp of the global statfile.
- * ----------
- */
-static bool
-pgstat_read_db_statsfile_timestamp(Oid databaseid, bool permanent,
- TimestampTz *ts)
-{
- PgStat_StatDBEntry dbentry;
- PgStat_GlobalStats myGlobalStats;
- PgStat_ArchiverStats myArchiverStats;
- FILE *fpin;
- int32 format_id;
- const char *statfile = permanent ? PGSTAT_STAT_PERMANENT_FILENAME : pgstat_stat_filename;
-
- /*
- * Try to open the stats file. As above, anything but ENOENT is worthy of
- * complaining about.
- */
- if ((fpin = AllocateFile(statfile, PG_BINARY_R)) == NULL)
- {
- if (errno != ENOENT)
- ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errcode_for_file_access(),
- errmsg("could not open statistics file \"%s\": %m",
- statfile)));
- return false;
- }
-
- /*
- * Verify it's of the expected format.
- */
- if (fread(&format_id, 1, sizeof(format_id), fpin) != sizeof(format_id) ||
- format_id != PGSTAT_FILE_FORMAT_ID)
- {
- ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted statistics file \"%s\"", statfile)));
- FreeFile(fpin);
- return false;
- }
-
- /*
- * Read global stats struct
- */
- if (fread(&myGlobalStats, 1, sizeof(myGlobalStats),
- fpin) != sizeof(myGlobalStats))
- {
- ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted statistics file \"%s\"", statfile)));
- FreeFile(fpin);
- return false;
- }
-
- /*
- * Read archiver stats struct
- */
- if (fread(&myArchiverStats, 1, sizeof(myArchiverStats),
- fpin) != sizeof(myArchiverStats))
- {
- ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted statistics file \"%s\"", statfile)));
- FreeFile(fpin);
- return false;
- }
-
- /* By default, we're going to return the timestamp of the global file. */
- *ts = myGlobalStats.stats_timestamp;
-
- /*
- * We found an existing collector stats file. Read it and look for a
- * record for the requested database. If found, use its timestamp.
- */
- for (;;)
- {
- switch (fgetc(fpin))
- {
- /*
- * 'D' A PgStat_StatDBEntry struct describing a database
- * follows.
- */
- case 'D':
- if (fread(&dbentry, 1, offsetof(PgStat_StatDBEntry, tables),
- fpin) != offsetof(PgStat_StatDBEntry, tables))
- {
- ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted statistics file \"%s\"",
- statfile)));
- goto done;
- }
-
- /*
- * If this is the DB we're looking for, save its timestamp and
- * we're done.
- */
- if (dbentry.databaseid == databaseid)
- {
- *ts = dbentry.stats_timestamp;
- goto done;
- }
-
- break;
-
- case 'E':
- goto done;
-
- default:
- ereport(pgStatRunningInCollector ? LOG : WARNING,
- (errmsg("corrupted statistics file \"%s\"",
- statfile)));
- goto done;
- }
- }
+ if (tabhash)
+ dshash_detach(tabhash);
+ if (funchash)
+ dshash_detach(funchash);
-done:
FreeFile(fpin);
- return true;
-}
-
-/*
- * If not already done, read the statistics collector stats file into
- * some hash tables. The results will be kept until pgstat_clear_snapshot()
- * is called (typically, at end of transaction).
- */
-static void
-backend_read_statsfile(void)
-{
- TimestampTz min_ts = 0;
- TimestampTz ref_ts = 0;
- Oid inquiry_db;
- int count;
-
- /* already read it? */
- if (pgStatDBHash)
- return;
- Assert(!pgStatRunningInCollector);
-
- /*
- * In a normal backend, we check staleness of the data for our own DB, and
- * so we send MyDatabaseId in inquiry messages. In the autovac launcher,
- * check staleness of the shared-catalog data, and send InvalidOid in
- * inquiry messages so as not to force writing unnecessary data.
- */
- if (IsAutoVacuumLauncherProcess())
- inquiry_db = InvalidOid;
- else
- inquiry_db = MyDatabaseId;
-
- /*
- * Loop until fresh enough stats file is available or we ran out of time.
- * The stats inquiry message is sent repeatedly in case collector drops
- * it; but not every single time, as that just swamps the collector.
- */
- for (count = 0; count < PGSTAT_POLL_LOOP_COUNT; count++)
- {
- bool ok;
- TimestampTz file_ts = 0;
- TimestampTz cur_ts;
-
- CHECK_FOR_INTERRUPTS();
-
- ok = pgstat_read_db_statsfile_timestamp(inquiry_db, false, &file_ts);
-
- cur_ts = GetCurrentTimestamp();
- /* Calculate min acceptable timestamp, if we didn't already */
- if (count == 0 || cur_ts < ref_ts)
- {
- /*
- * We set the minimum acceptable timestamp to PGSTAT_STAT_INTERVAL
- * msec before now. This indirectly ensures that the collector
- * needn't write the file more often than PGSTAT_STAT_INTERVAL. In
- * an autovacuum worker, however, we want a lower delay to avoid
- * using stale data, so we use PGSTAT_RETRY_DELAY (since the
- * number of workers is low, this shouldn't be a problem).
- *
- * We don't recompute min_ts after sleeping, except in the
- * unlikely case that cur_ts went backwards. So we might end up
- * accepting a file a bit older than PGSTAT_STAT_INTERVAL. In
- * practice that shouldn't happen, though, as long as the sleep
- * time is less than PGSTAT_STAT_INTERVAL; and we don't want to
- * tell the collector that our cutoff time is less than what we'd
- * actually accept.
- */
- ref_ts = cur_ts;
- if (IsAutoVacuumWorkerProcess())
- min_ts = TimestampTzPlusMilliseconds(ref_ts,
- -PGSTAT_RETRY_DELAY);
- else
- min_ts = TimestampTzPlusMilliseconds(ref_ts,
- -PGSTAT_STAT_INTERVAL);
- }
-
- /*
- * If the file timestamp is actually newer than cur_ts, we must have
- * had a clock glitch (system time went backwards) or there is clock
- * skew between our processor and the stats collector's processor.
- * Accept the file, but send an inquiry message anyway to make
- * pgstat_recv_inquiry do a sanity check on the collector's time.
- */
- if (ok && file_ts > cur_ts)
- {
- /*
- * A small amount of clock skew between processors isn't terribly
- * surprising, but a large difference is worth logging. We
- * arbitrarily define "large" as 1000 msec.
- */
- if (file_ts >= TimestampTzPlusMilliseconds(cur_ts, 1000))
- {
- char *filetime;
- char *mytime;
-
- /* Copy because timestamptz_to_str returns a static buffer */
- filetime = pstrdup(timestamptz_to_str(file_ts));
- mytime = pstrdup(timestamptz_to_str(cur_ts));
- elog(LOG, "stats collector's time %s is later than backend local time %s",
- filetime, mytime);
- pfree(filetime);
- pfree(mytime);
- }
-
- pgstat_send_inquiry(cur_ts, min_ts, inquiry_db);
- break;
- }
-
- /* Normal acceptance case: file is not older than cutoff time */
- if (ok && file_ts >= min_ts)
- break;
-
- /* Not there or too old, so kick the collector and wait a bit */
- if ((count % PGSTAT_INQ_LOOP_COUNT) == 0)
- pgstat_send_inquiry(cur_ts, min_ts, inquiry_db);
-
- pg_usleep(PGSTAT_RETRY_DELAY * 1000L);
- }
- if (count >= PGSTAT_POLL_LOOP_COUNT)
- ereport(LOG,
- (errmsg("using stale statistics instead of current ones "
- "because stats collector is not responding")));
-
- /*
- * Autovacuum launcher wants stats about all databases, but a shallow read
- * is sufficient. Regular backends want a deep read for just the tables
- * they can see (MyDatabaseId + shared catalogs).
- */
- if (IsAutoVacuumLauncherProcess())
- pgStatDBHash = pgstat_read_statsfiles(InvalidOid, false, false);
- else
- pgStatDBHash = pgstat_read_statsfiles(MyDatabaseId, false, true);
+ elog(DEBUG2, "removing permanent stats file \"%s\"", statfile);
+ unlink(statfile);
}
/* ----------
* pgstat_setup_memcxt() -
*
- * Create pgStatLocalContext, if not already done.
+ * Create pgStatLocalContext and pgStatSnapshotContext, if not already done.
* ----------
*/
static void
pgstat_setup_memcxt(void)
{
if (!pgStatLocalContext)
- pgStatLocalContext = AllocSetContextCreate(TopMemoryContext,
- "Statistics snapshot",
- ALLOCSET_SMALL_SIZES);
+ pgStatLocalContext =
+ AllocSetContextCreate(TopMemoryContext,
+ "Backend statistics snapshot",
+ ALLOCSET_SMALL_SIZES);
+
+ if (!pgStatSnapshotContext)
+ pgStatSnapshotContext =
+ AllocSetContextCreate(TopMemoryContext,
+ "Database statistics snapshot",
+ ALLOCSET_SMALL_SIZES);
}
@@ -5668,739 +5247,185 @@ pgstat_clear_snapshot(void)
{
/* Release memory, if any was allocated */
if (pgStatLocalContext)
+ {
MemoryContextDelete(pgStatLocalContext);
- /* Reset variables */
- pgStatLocalContext = NULL;
- pgStatDBHash = NULL;
- localBackendStatusTable = NULL;
- localNumBackends = 0;
-}
+ /* Reset variables */
+ pgStatLocalContext = NULL;
+ localBackendStatusTable = NULL;
+ localNumBackends = 0;
+ }
+ if (pgStatSnapshotContext)
+ clear_snapshot = true;
+}
-/* ----------
- * pgstat_recv_inquiry() -
- *
- * Process stat inquiry requests.
- * ----------
- */
-static void
-pgstat_recv_inquiry(PgStat_MsgInquiry *msg, int len)
+static bool
+pgstat_update_tabentry(dshash_table *tabhash, PgStat_TableStatus *stat,
+ bool nowait)
{
- PgStat_StatDBEntry *dbentry;
+ PgStat_StatTabEntry *tabent;
+ bool found;
- elog(DEBUG2, "received inquiry for database %u", msg->databaseid);
+ if (tabhash == NULL)
+ return false;
- /*
- * If there's already a write request for this DB, there's nothing to do.
- *
- * Note that if a request is found, we return early and skip the below
- * check for clock skew. This is okay, since the only way for a DB
- * request to be present in the list is that we have been here since the
- * last write round. It seems sufficient to check for clock skew once per
- * write round.
- */
- if (list_member_oid(pending_write_requests, msg->databaseid))
- return;
+ tabent = (PgStat_StatTabEntry *)
+ dshash_find_extended(tabhash, (void *) &(stat->t_id),
+ true, nowait, true, &found);
- /*
- * Check to see if we last wrote this database at a time >= the requested
- * cutoff time. If so, this is a stale request that was generated before
- * we updated the DB file, and we don't need to do so again.
- *
- * If the requestor's local clock time is older than stats_timestamp, we
- * should suspect a clock glitch, ie system time going backwards; though
- * the more likely explanation is just delayed message receipt. It is
- * worth expending a GetCurrentTimestamp call to be sure, since a large
- * retreat in the system clock reading could otherwise cause us to neglect
- * to update the stats file for a long time.
- */
- dbentry = pgstat_get_db_entry(msg->databaseid, false);
- if (dbentry == NULL)
+ /* failed to acquire lock */
+ if (tabent == NULL)
+ return false;
+
+ if (!found)
{
/*
- * We have no data for this DB. Enter a write request anyway so that
- * the global stats will get updated. This is needed to prevent
- * backend_read_statsfile from waiting for data that we cannot supply,
- * in the case of a new DB that nobody has yet reported any stats for.
- * See the behavior of pgstat_read_db_statsfile_timestamp.
+ * If it's a new table entry, initialize counters to the values we
+ * just got.
*/
+ tabent->numscans = stat->t_counts.t_numscans;
+ tabent->tuples_returned = stat->t_counts.t_tuples_returned;
+ tabent->tuples_fetched = stat->t_counts.t_tuples_fetched;
+ tabent->tuples_inserted = stat->t_counts.t_tuples_inserted;
+ tabent->tuples_updated = stat->t_counts.t_tuples_updated;
+ tabent->tuples_deleted = stat->t_counts.t_tuples_deleted;
+ tabent->tuples_hot_updated = stat->t_counts.t_tuples_hot_updated;
+ tabent->n_live_tuples = stat->t_counts.t_delta_live_tuples;
+ tabent->n_dead_tuples = stat->t_counts.t_delta_dead_tuples;
+ tabent->changes_since_analyze = stat->t_counts.t_changed_tuples;
+ tabent->blocks_fetched = stat->t_counts.t_blocks_fetched;
+ tabent->blocks_hit = stat->t_counts.t_blocks_hit;
+
+ tabent->vacuum_timestamp = 0;
+ tabent->vacuum_count = 0;
+ tabent->autovac_vacuum_timestamp = 0;
+ tabent->autovac_vacuum_count = 0;
+ tabent->analyze_timestamp = 0;
+ tabent->analyze_count = 0;
+ tabent->autovac_analyze_timestamp = 0;
+ tabent->autovac_analyze_count = 0;
}
- else if (msg->clock_time < dbentry->stats_timestamp)
+ else
{
- TimestampTz cur_ts = GetCurrentTimestamp();
-
- if (cur_ts < dbentry->stats_timestamp)
- {
- /*
- * Sure enough, time went backwards. Force a new stats file write
- * to get back in sync; but first, log a complaint.
- */
- char *writetime;
- char *mytime;
-
- /* Copy because timestamptz_to_str returns a static buffer */
- writetime = pstrdup(timestamptz_to_str(dbentry->stats_timestamp));
- mytime = pstrdup(timestamptz_to_str(cur_ts));
- elog(LOG,
- "stats_timestamp %s is later than collector's time %s for database %u",
- writetime, mytime, dbentry->databaseid);
- pfree(writetime);
- pfree(mytime);
- }
- else
+ /*
+ * Otherwise add the values to the existing entry.
+ */
+ tabent->numscans += stat->t_counts.t_numscans;
+ tabent->tuples_returned += stat->t_counts.t_tuples_returned;
+ tabent->tuples_fetched += stat->t_counts.t_tuples_fetched;
+ tabent->tuples_inserted += stat->t_counts.t_tuples_inserted;
+ tabent->tuples_updated += stat->t_counts.t_tuples_updated;
+ tabent->tuples_deleted += stat->t_counts.t_tuples_deleted;
+ tabent->tuples_hot_updated += stat->t_counts.t_tuples_hot_updated;
+ /* If table was truncated, first reset the live/dead counters */
+ if (stat->t_counts.t_truncated)
{
- /*
- * Nope, it's just an old request. Assuming msg's clock_time is
- * >= its cutoff_time, it must be stale, so we can ignore it.
- */
- return;
+ tabent->n_live_tuples = 0;
+ tabent->n_dead_tuples = 0;
}
- }
- else if (msg->cutoff_time <= dbentry->stats_timestamp)
- {
- /* Stale request, ignore it */
- return;
+ tabent->n_live_tuples += stat->t_counts.t_delta_live_tuples;
+ tabent->n_dead_tuples += stat->t_counts.t_delta_dead_tuples;
+ tabent->changes_since_analyze += stat->t_counts.t_changed_tuples;
+ tabent->blocks_fetched += stat->t_counts.t_blocks_fetched;
+ tabent->blocks_hit += stat->t_counts.t_blocks_hit;
}
- /*
- * We need to write this DB, so create a request.
- */
- pending_write_requests = lappend_oid(pending_write_requests,
- msg->databaseid);
+ /* Clamp n_live_tuples in case of negative delta_live_tuples */
+ tabent->n_live_tuples = Max(tabent->n_live_tuples, 0);
+ /* Likewise for n_dead_tuples */
+ tabent->n_dead_tuples = Max(tabent->n_dead_tuples, 0);
+
+ dshash_release_lock(tabhash, tabent);
+
+ return true;
}
-/* ----------
- * pgstat_recv_tabstat() -
+/*
+ * Lookup shared stats hash table for the specified database. Returns NULL
+ * when PGSTAT_NOWAIT and required lock cannot be acquired.
*
- * Count what the backend has done.
- * ----------
*/
-static void
-pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len)
+static PgStat_StatDBEntry *
+pgstat_get_db_entry(Oid databaseid, bool exclusive, bool nowait, bool create)
{
- PgStat_StatDBEntry *dbentry;
- PgStat_StatTabEntry *tabentry;
- int i;
- bool found;
+ PgStat_StatDBEntry *result;
+ bool found = true;
- dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
+ if (!IsUnderPostmaster || !pgStatDBHash)
+ return NULL;
- /*
- * Update database-wide stats.
- */
- dbentry->n_xact_commit += (PgStat_Counter) (msg->m_xact_commit);
- dbentry->n_xact_rollback += (PgStat_Counter) (msg->m_xact_rollback);
- dbentry->n_block_read_time += msg->m_block_read_time;
- dbentry->n_block_write_time += msg->m_block_write_time;
-
- /*
- * Process all table entries in the message.
- */
- for (i = 0; i < msg->m_nentries; i++)
- {
- PgStat_TableEntry *tabmsg = &(msg->m_entry[i]);
-
- tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
- (void *) &(tabmsg->t_id),
- HASH_ENTER, &found);
+ /* Lookup or create the hash table entry for this database */
+ result = (PgStat_StatDBEntry *)
+ dshash_find_extended(pgStatDBHash, &databaseid,
+ exclusive, nowait, create, &found);
- if (!found)
- {
- /*
- * If it's a new table entry, initialize counters to the values we
- * just got.
- */
- tabentry->numscans = tabmsg->t_counts.t_numscans;
- tabentry->tuples_returned = tabmsg->t_counts.t_tuples_returned;
- tabentry->tuples_fetched = tabmsg->t_counts.t_tuples_fetched;
- tabentry->tuples_inserted = tabmsg->t_counts.t_tuples_inserted;
- tabentry->tuples_updated = tabmsg->t_counts.t_tuples_updated;
- tabentry->tuples_deleted = tabmsg->t_counts.t_tuples_deleted;
- tabentry->tuples_hot_updated = tabmsg->t_counts.t_tuples_hot_updated;
- tabentry->n_live_tuples = tabmsg->t_counts.t_delta_live_tuples;
- tabentry->n_dead_tuples = tabmsg->t_counts.t_delta_dead_tuples;
- tabentry->changes_since_analyze = tabmsg->t_counts.t_changed_tuples;
- tabentry->blocks_fetched = tabmsg->t_counts.t_blocks_fetched;
- tabentry->blocks_hit = tabmsg->t_counts.t_blocks_hit;
-
- tabentry->vacuum_timestamp = 0;
- tabentry->vacuum_count = 0;
- tabentry->autovac_vacuum_timestamp = 0;
- tabentry->autovac_vacuum_count = 0;
- tabentry->analyze_timestamp = 0;
- tabentry->analyze_count = 0;
- tabentry->autovac_analyze_timestamp = 0;
- tabentry->autovac_analyze_count = 0;
- }
- else
- {
- /*
- * Otherwise add the values to the existing entry.
- */
- tabentry->numscans += tabmsg->t_counts.t_numscans;
- tabentry->tuples_returned += tabmsg->t_counts.t_tuples_returned;
- tabentry->tuples_fetched += tabmsg->t_counts.t_tuples_fetched;
- tabentry->tuples_inserted += tabmsg->t_counts.t_tuples_inserted;
- tabentry->tuples_updated += tabmsg->t_counts.t_tuples_updated;
- tabentry->tuples_deleted += tabmsg->t_counts.t_tuples_deleted;
- tabentry->tuples_hot_updated += tabmsg->t_counts.t_tuples_hot_updated;
- /* If table was truncated, first reset the live/dead counters */
- if (tabmsg->t_counts.t_truncated)
- {
- tabentry->n_live_tuples = 0;
- tabentry->n_dead_tuples = 0;
- }
- tabentry->n_live_tuples += tabmsg->t_counts.t_delta_live_tuples;
- tabentry->n_dead_tuples += tabmsg->t_counts.t_delta_dead_tuples;
- tabentry->changes_since_analyze += tabmsg->t_counts.t_changed_tuples;
- tabentry->blocks_fetched += tabmsg->t_counts.t_blocks_fetched;
- tabentry->blocks_hit += tabmsg->t_counts.t_blocks_hit;
- }
+ if (result == NULL)
+ return NULL;
- /* Clamp n_live_tuples in case of negative delta_live_tuples */
- tabentry->n_live_tuples = Max(tabentry->n_live_tuples, 0);
- /* Likewise for n_dead_tuples */
- tabentry->n_dead_tuples = Max(tabentry->n_dead_tuples, 0);
+ if (create && !found)
+ {
+ Assert(create);
/*
- * Add per-table stats to the per-database entry, too.
+ * Initialize the new entry. This creates empty hash tables hash,
+ * too.
*/
- dbentry->n_tuples_returned += tabmsg->t_counts.t_tuples_returned;
- dbentry->n_tuples_fetched += tabmsg->t_counts.t_tuples_fetched;
- dbentry->n_tuples_inserted += tabmsg->t_counts.t_tuples_inserted;
- dbentry->n_tuples_updated += tabmsg->t_counts.t_tuples_updated;
- dbentry->n_tuples_deleted += tabmsg->t_counts.t_tuples_deleted;
- dbentry->n_blocks_fetched += tabmsg->t_counts.t_blocks_fetched;
- dbentry->n_blocks_hit += tabmsg->t_counts.t_blocks_hit;
- }
-}
-
-
-/* ----------
- * pgstat_recv_tabpurge() -
- *
- * Arrange for dead table removal.
- * ----------
- */
-static void
-pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
- int i;
-
- dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
-
- /*
- * No need to purge if we don't even know the database.
- */
- if (!dbentry || !dbentry->tables)
- return;
-
- /*
- * Process all table entries in the message.
- */
- for (i = 0; i < msg->m_nentries; i++)
- {
- /* Remove from hashtable if present; we don't care if it's not. */
- (void) hash_search(dbentry->tables,
- (void *) &(msg->m_tableid[i]),
- HASH_REMOVE, NULL);
- }
-}
-
-
-/* ----------
- * pgstat_recv_dropdb() -
- *
- * Arrange for dead database removal
- * ----------
- */
-static void
-pgstat_recv_dropdb(PgStat_MsgDropdb *msg, int len)
-{
- Oid dbid = msg->m_databaseid;
- PgStat_StatDBEntry *dbentry;
-
- /*
- * Lookup the database in the hashtable.
- */
- dbentry = pgstat_get_db_entry(dbid, false);
-
- /*
- * If found, remove it (along with the db statfile).
- */
- if (dbentry)
- {
- char statfile[MAXPGPATH];
-
- get_dbstat_filename(false, false, dbid, statfile, MAXPGPATH);
-
- elog(DEBUG2, "removing stats file \"%s\"", statfile);
- unlink(statfile);
-
- if (dbentry->tables != NULL)
- hash_destroy(dbentry->tables);
- if (dbentry->functions != NULL)
- hash_destroy(dbentry->functions);
-
- if (hash_search(pgStatDBHash,
- (void *) &dbid,
- HASH_REMOVE, NULL) == NULL)
- ereport(ERROR,
- (errmsg("database hash table corrupted during cleanup --- abort")));
- }
-}
-
-
-/* ----------
- * pgstat_recv_resetcounter() -
- *
- * Reset the statistics for the specified database.
- * ----------
- */
-static void
-pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
-
- /*
- * Lookup the database in the hashtable. Nothing to do if not there.
- */
- dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
-
- if (!dbentry)
- return;
-
- /*
- * We simply throw away all the database's table entries by recreating a
- * new hash table for them.
- */
- if (dbentry->tables != NULL)
- hash_destroy(dbentry->tables);
- if (dbentry->functions != NULL)
- hash_destroy(dbentry->functions);
-
- dbentry->tables = NULL;
- dbentry->functions = NULL;
-
- /*
- * Reset database-level stats, too. This creates empty hash tables for
- * tables and functions.
- */
- reset_dbentry_counters(dbentry);
-}
-
-/* ----------
- * pgstat_recv_resetsharedcounter() -
- *
- * Reset some shared statistics of the cluster.
- * ----------
- */
-static void
-pgstat_recv_resetsharedcounter(PgStat_MsgResetsharedcounter *msg, int len)
-{
- if (msg->m_resettarget == RESET_BGWRITER)
- {
- /* Reset the global background writer statistics for the cluster. */
- memset(&globalStats, 0, sizeof(globalStats));
- globalStats.stat_reset_timestamp = GetCurrentTimestamp();
- }
- else if (msg->m_resettarget == RESET_ARCHIVER)
- {
- /* Reset the archiver statistics for the cluster. */
- memset(&archiverStats, 0, sizeof(archiverStats));
- archiverStats.stat_reset_timestamp = GetCurrentTimestamp();
- }
-
- /*
- * Presumably the sender of this message validated the target, don't
- * complain here if it's not valid
- */
-}
-
-/* ----------
- * pgstat_recv_resetsinglecounter() -
- *
- * Reset a statistics for a single object
- * ----------
- */
-static void
-pgstat_recv_resetsinglecounter(PgStat_MsgResetsinglecounter *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
-
- dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
-
- if (!dbentry)
- return;
-
- /* Set the reset timestamp for the whole database */
- dbentry->stat_reset_timestamp = GetCurrentTimestamp();
-
- /* Remove object if it exists, ignore it if not */
- if (msg->m_resettype == RESET_TABLE)
- (void) hash_search(dbentry->tables, (void *) &(msg->m_objectid),
- HASH_REMOVE, NULL);
- else if (msg->m_resettype == RESET_FUNCTION)
- (void) hash_search(dbentry->functions, (void *) &(msg->m_objectid),
- HASH_REMOVE, NULL);
-}
-
-/* ----------
- * pgstat_recv_autovac() -
- *
- * Process an autovacuum signalling message.
- * ----------
- */
-static void
-pgstat_recv_autovac(PgStat_MsgAutovacStart *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
-
- /*
- * Store the last autovacuum time in the database's hashtable entry.
- */
- dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
-
- dbentry->last_autovac_time = msg->m_start_time;
-}
-
-/* ----------
- * pgstat_recv_vacuum() -
- *
- * Process a VACUUM message.
- * ----------
- */
-static void
-pgstat_recv_vacuum(PgStat_MsgVacuum *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
- PgStat_StatTabEntry *tabentry;
-
- /*
- * Store the data in the table's hashtable entry.
- */
- dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
-
- tabentry = pgstat_get_tab_entry(dbentry, msg->m_tableoid, true);
-
- tabentry->n_live_tuples = msg->m_live_tuples;
- tabentry->n_dead_tuples = msg->m_dead_tuples;
-
- if (msg->m_autovacuum)
- {
- tabentry->autovac_vacuum_timestamp = msg->m_vacuumtime;
- tabentry->autovac_vacuum_count++;
- }
- else
- {
- tabentry->vacuum_timestamp = msg->m_vacuumtime;
- tabentry->vacuum_count++;
+ init_dbentry(result);
}
-}
-/* ----------
- * pgstat_recv_analyze() -
- *
- * Process an ANALYZE message.
- * ----------
- */
-static void
-pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
- PgStat_StatTabEntry *tabentry;
-
- /*
- * Store the data in the table's hashtable entry.
- */
- dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
-
- tabentry = pgstat_get_tab_entry(dbentry, msg->m_tableoid, true);
-
- tabentry->n_live_tuples = msg->m_live_tuples;
- tabentry->n_dead_tuples = msg->m_dead_tuples;
-
- /*
- * If commanded, reset changes_since_analyze to zero. This forgets any
- * changes that were committed while the ANALYZE was in progress, but we
- * have no good way to estimate how many of those there were.
- */
- if (msg->m_resetcounter)
- tabentry->changes_since_analyze = 0;
-
- if (msg->m_autovacuum)
- {
- tabentry->autovac_analyze_timestamp = msg->m_analyzetime;
- tabentry->autovac_analyze_count++;
- }
- else
- {
- tabentry->analyze_timestamp = msg->m_analyzetime;
- tabentry->analyze_count++;
- }
-}
-
-
-/* ----------
- * pgstat_recv_archiver() -
- *
- * Process a ARCHIVER message.
- * ----------
- */
-static void
-pgstat_recv_archiver(PgStat_MsgArchiver *msg, int len)
-{
- if (msg->m_failed)
- {
- /* Failed archival attempt */
- ++archiverStats.failed_count;
- memcpy(archiverStats.last_failed_wal, msg->m_xlog,
- sizeof(archiverStats.last_failed_wal));
- archiverStats.last_failed_timestamp = msg->m_timestamp;
- }
- else
- {
- /* Successful archival operation */
- ++archiverStats.archived_count;
- memcpy(archiverStats.last_archived_wal, msg->m_xlog,
- sizeof(archiverStats.last_archived_wal));
- archiverStats.last_archived_timestamp = msg->m_timestamp;
- }
-}
-
-/* ----------
- * pgstat_recv_bgwriter() -
- *
- * Process a BGWRITER message.
- * ----------
- */
-static void
-pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len)
-{
- globalStats.timed_checkpoints += msg->m_timed_checkpoints;
- globalStats.requested_checkpoints += msg->m_requested_checkpoints;
- globalStats.checkpoint_write_time += msg->m_checkpoint_write_time;
- globalStats.checkpoint_sync_time += msg->m_checkpoint_sync_time;
- globalStats.buf_written_checkpoints += msg->m_buf_written_checkpoints;
- globalStats.buf_written_clean += msg->m_buf_written_clean;
- globalStats.maxwritten_clean += msg->m_maxwritten_clean;
- globalStats.buf_written_backend += msg->m_buf_written_backend;
- globalStats.buf_fsync_backend += msg->m_buf_fsync_backend;
- globalStats.buf_alloc += msg->m_buf_alloc;
-}
-
-/* ----------
- * pgstat_recv_recoveryconflict() -
- *
- * Process a RECOVERYCONFLICT message.
- * ----------
- */
-static void
-pgstat_recv_recoveryconflict(PgStat_MsgRecoveryConflict *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
-
- dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
-
- switch (msg->m_reason)
- {
- case PROCSIG_RECOVERY_CONFLICT_DATABASE:
-
- /*
- * Since we drop the information about the database as soon as it
- * replicates, there is no point in counting these conflicts.
- */
- break;
- case PROCSIG_RECOVERY_CONFLICT_TABLESPACE:
- dbentry->n_conflict_tablespace++;
- break;
- case PROCSIG_RECOVERY_CONFLICT_LOCK:
- dbentry->n_conflict_lock++;
- break;
- case PROCSIG_RECOVERY_CONFLICT_SNAPSHOT:
- dbentry->n_conflict_snapshot++;
- break;
- case PROCSIG_RECOVERY_CONFLICT_BUFFERPIN:
- dbentry->n_conflict_bufferpin++;
- break;
- case PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK:
- dbentry->n_conflict_startup_deadlock++;
- break;
- }
-}
-
-/* ----------
- * pgstat_recv_deadlock() -
- *
- * Process a DEADLOCK message.
- * ----------
- */
-static void
-pgstat_recv_deadlock(PgStat_MsgDeadlock *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
-
- dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
-
- dbentry->n_deadlocks++;
-}
-
-/* ----------
- * pgstat_recv_checksum_failure() -
- *
- * Process a CHECKSUMFAILURE message.
- * ----------
- */
-static void
-pgstat_recv_checksum_failure(PgStat_MsgChecksumFailure *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
-
- dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
-
- dbentry->n_checksum_failures += msg->m_failurecount;
- dbentry->last_checksum_failure = msg->m_failure_time;
-}
-
-/* ----------
- * pgstat_recv_tempfile() -
- *
- * Process a TEMPFILE message.
- * ----------
- */
-static void
-pgstat_recv_tempfile(PgStat_MsgTempFile *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
-
- dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
-
- dbentry->n_temp_bytes += msg->m_filesize;
- dbentry->n_temp_files += 1;
+ return result;
}
-/* ----------
- * pgstat_recv_funcstat() -
- *
- * Count what the backend has done.
- * ----------
+/*
+ * Lookup the hash table entry for the specified table. Returned entry is
+ * exclusive locked.
+ * If no hash table entry exists, creates it, if create is true.
+ * Else, returns NULL.
*/
-static void
-pgstat_recv_funcstat(PgStat_MsgFuncstat *msg, int len)
+static PgStat_StatTabEntry *
+pgstat_get_tab_entry(dshash_table *table, Oid tableoid, bool create)
{
- PgStat_FunctionEntry *funcmsg = &(msg->m_entry[0]);
- PgStat_StatDBEntry *dbentry;
- PgStat_StatFuncEntry *funcentry;
- int i;
+ PgStat_StatTabEntry *result;
bool found;
- dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
-
- /*
- * Process all function entries in the message.
- */
- for (i = 0; i < msg->m_nentries; i++, funcmsg++)
- {
- funcentry = (PgStat_StatFuncEntry *) hash_search(dbentry->functions,
- (void *) &(funcmsg->f_id),
- HASH_ENTER, &found);
-
- if (!found)
- {
- /*
- * If it's a new function entry, initialize counters to the values
- * we just got.
- */
- funcentry->f_numcalls = funcmsg->f_numcalls;
- funcentry->f_total_time = funcmsg->f_total_time;
- funcentry->f_self_time = funcmsg->f_self_time;
- }
- else
- {
- /*
- * Otherwise add the values to the existing entry.
- */
- funcentry->f_numcalls += funcmsg->f_numcalls;
- funcentry->f_total_time += funcmsg->f_total_time;
- funcentry->f_self_time += funcmsg->f_self_time;
- }
- }
-}
-
-/* ----------
- * pgstat_recv_funcpurge() -
- *
- * Arrange for dead function removal.
- * ----------
- */
-static void
-pgstat_recv_funcpurge(PgStat_MsgFuncpurge *msg, int len)
-{
- PgStat_StatDBEntry *dbentry;
- int i;
-
- dbentry = pgstat_get_db_entry(msg->m_databaseid, false);
+ /* Lookup or create the hash table entry for this table */
+ if (create)
+ result = (PgStat_StatTabEntry *)
+ dshash_find_or_insert(table, &tableoid, &found);
+ else
+ result = (PgStat_StatTabEntry *) dshash_find(table, &tableoid, false);
- /*
- * No need to purge if we don't even know the database.
- */
- if (!dbentry || !dbentry->functions)
- return;
+ if (!create && !found)
+ return NULL;
- /*
- * Process all function entries in the message.
- */
- for (i = 0; i < msg->m_nentries; i++)
+ /* If not found, initialize the new one. */
+ if (!found)
{
- /* Remove from hashtable if present; we don't care if it's not. */
- (void) hash_search(dbentry->functions,
- (void *) &(msg->m_functionid[i]),
- HASH_REMOVE, NULL);
+ result->numscans = 0;
+ result->tuples_returned = 0;
+ result->tuples_fetched = 0;
+ result->tuples_inserted = 0;
+ result->tuples_updated = 0;
+ result->tuples_deleted = 0;
+ result->tuples_hot_updated = 0;
+ result->n_live_tuples = 0;
+ result->n_dead_tuples = 0;
+ result->changes_since_analyze = 0;
+ result->blocks_fetched = 0;
+ result->blocks_hit = 0;
+ result->vacuum_timestamp = 0;
+ result->vacuum_count = 0;
+ result->autovac_vacuum_timestamp = 0;
+ result->autovac_vacuum_count = 0;
+ result->analyze_timestamp = 0;
+ result->analyze_count = 0;
+ result->autovac_analyze_timestamp = 0;
+ result->autovac_analyze_count = 0;
}
-}
-
-/* ----------
- * pgstat_write_statsfile_needed() -
- *
- * Do we need to write out any stats files?
- * ----------
- */
-static bool
-pgstat_write_statsfile_needed(void)
-{
- if (pending_write_requests != NIL)
- return true;
-
- /* Everything was written recently */
- return false;
-}
-/* ----------
- * pgstat_db_requested() -
- *
- * Checks whether stats for a particular DB need to be written to a file.
- * ----------
- */
-static bool
-pgstat_db_requested(Oid databaseid)
-{
- /*
- * If any requests are outstanding at all, we should write the stats for
- * shared catalogs (the "database" with OID 0). This ensures that
- * backends will see up-to-date stats for shared catalogs, even though
- * they send inquiry messages mentioning only their own DB.
- */
- if (databaseid == InvalidOid && pending_write_requests != NIL)
- return true;
-
- /* Search to see if there's an open request to write this database. */
- if (list_member_oid(pending_write_requests, databaseid))
- return true;
-
- return false;
+ return result;
}
/*
diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
index fab4a9dd51..d418fe3bd0 100644
--- a/src/backend/postmaster/postmaster.c
+++ b/src/backend/postmaster/postmaster.c
@@ -255,7 +255,6 @@ static pid_t StartupPID = 0,
WalReceiverPID = 0,
AutoVacPID = 0,
PgArchPID = 0,
- PgStatPID = 0,
SysLoggerPID = 0;
/* Startup process's status */
@@ -503,7 +502,6 @@ typedef struct
PGPROC *AuxiliaryProcs;
PGPROC *PreparedXactProcs;
PMSignalData *PMSignalState;
- InheritableSocket pgStatSock;
pid_t PostmasterPid;
TimestampTz PgStartTime;
TimestampTz PgReloadTime;
@@ -1326,12 +1324,6 @@ PostmasterMain(int argc, char *argv[])
*/
RemovePgTempFiles();
- /*
- * Initialize stats collection subsystem (this does NOT start the
- * collector process!)
- */
- pgstat_init();
-
/*
* Initialize the autovacuum subsystem (again, no process start yet)
*/
@@ -1780,11 +1772,6 @@ ServerLoop(void)
start_autovac_launcher = false; /* signal processed */
}
- /* If we have lost the stats collector, try to start a new one */
- if (PgStatPID == 0 &&
- (pmState == PM_RUN || pmState == PM_HOT_STANDBY))
- PgStatPID = pgstat_start();
-
/* If we have lost the archiver, try to start a new one. */
if (PgArchPID == 0 && PgArchStartupAllowed())
PgArchPID = StartArchiver();
@@ -2694,8 +2681,6 @@ SIGHUP_handler(SIGNAL_ARGS)
signal_child(PgArchPID, SIGHUP);
if (SysLoggerPID != 0)
signal_child(SysLoggerPID, SIGHUP);
- if (PgStatPID != 0)
- signal_child(PgStatPID, SIGHUP);
/* Reload authentication config files too */
if (!load_hba())
@@ -3058,8 +3043,6 @@ reaper(SIGNAL_ARGS)
AutoVacPID = StartAutoVacLauncher();
if (PgArchStartupAllowed() && PgArchPID == 0)
PgArchPID = StartArchiver();
- if (PgStatPID == 0)
- PgStatPID = pgstat_start();
/* workers may be scheduled to start now */
maybe_start_bgworkers();
@@ -3126,13 +3109,6 @@ reaper(SIGNAL_ARGS)
SignalChildren(SIGUSR2);
pmState = PM_SHUTDOWN_2;
-
- /*
- * We can also shut down the stats collector now; there's
- * nothing left for it to do.
- */
- if (PgStatPID != 0)
- signal_child(PgStatPID, SIGQUIT);
}
else
{
@@ -3205,22 +3181,6 @@ reaper(SIGNAL_ARGS)
continue;
}
- /*
- * Was it the statistics collector? If so, just try to start a new
- * one; no need to force reset of the rest of the system. (If fail,
- * we'll try again in future cycles of the main loop.)
- */
- if (pid == PgStatPID)
- {
- PgStatPID = 0;
- if (!EXIT_STATUS_0(exitstatus))
- LogChildExit(LOG, _("statistics collector process"),
- pid, exitstatus);
- if (pmState == PM_RUN || pmState == PM_HOT_STANDBY)
- PgStatPID = pgstat_start();
- continue;
- }
-
/* Was it the system logger? If so, try to start a new one */
if (pid == SysLoggerPID)
{
@@ -3681,22 +3641,6 @@ HandleChildCrash(int pid, int exitstatus, const char *procname)
signal_child(PgArchPID, SIGQUIT);
}
- /*
- * Force a power-cycle of the pgstat process too. (This isn't absolutely
- * necessary, but it seems like a good idea for robustness, and it
- * simplifies the state-machine logic in the case where a shutdown request
- * arrives during crash processing.)
- */
- if (PgStatPID != 0 && take_action)
- {
- ereport(DEBUG2,
- (errmsg_internal("sending %s to process %d",
- "SIGQUIT",
- (int) PgStatPID)));
- signal_child(PgStatPID, SIGQUIT);
- allow_immediate_pgstat_restart();
- }
-
/* We do NOT restart the syslogger */
if (Shutdown != ImmediateShutdown)
@@ -3892,8 +3836,6 @@ PostmasterStateMachine(void)
SignalChildren(SIGQUIT);
if (PgArchPID != 0)
signal_child(PgArchPID, SIGQUIT);
- if (PgStatPID != 0)
- signal_child(PgStatPID, SIGQUIT);
}
}
}
@@ -3928,8 +3870,7 @@ PostmasterStateMachine(void)
* normal state transition leading up to PM_WAIT_DEAD_END, or during
* FatalError processing.
*/
- if (dlist_is_empty(&BackendList) &&
- PgArchPID == 0 && PgStatPID == 0)
+ if (dlist_is_empty(&BackendList) && PgArchPID == 0)
{
/* These other guys should be dead already */
Assert(StartupPID == 0);
@@ -4130,8 +4071,6 @@ TerminateChildren(int signal)
signal_child(AutoVacPID, signal);
if (PgArchPID != 0)
signal_child(PgArchPID, signal);
- if (PgStatPID != 0)
- signal_child(PgStatPID, signal);
}
/*
@@ -5109,18 +5048,6 @@ SubPostmasterMain(int argc, char *argv[])
StartBackgroundWorker();
}
- if (strcmp(argv[1], "--forkarch") == 0)
- {
- /* Do not want to attach to shared memory */
-
- PgArchiverMain(argc, argv); /* does not return */
- }
- if (strcmp(argv[1], "--forkcol") == 0)
- {
- /* Do not want to attach to shared memory */
-
- PgstatCollectorMain(argc, argv); /* does not return */
- }
if (strcmp(argv[1], "--forklog") == 0)
{
/* Do not want to attach to shared memory */
@@ -5239,12 +5166,6 @@ sigusr1_handler(SIGNAL_ARGS)
if (CheckPostmasterSignal(PMSIGNAL_BEGIN_HOT_STANDBY) &&
pmState == PM_RECOVERY && Shutdown == NoShutdown)
{
- /*
- * Likewise, start other special children as needed.
- */
- Assert(PgStatPID == 0);
- PgStatPID = pgstat_start();
-
ereport(LOG,
(errmsg("database system is ready to accept read only connections")));
@@ -6139,7 +6060,6 @@ extern slock_t *ShmemLock;
extern slock_t *ProcStructLock;
extern PGPROC *AuxiliaryProcs;
extern PMSignalData *PMSignalState;
-extern pgsocket pgStatSock;
extern pg_time_t first_syslogger_file_time;
#ifndef WIN32
@@ -6195,8 +6115,6 @@ save_backend_variables(BackendParameters *param, Port *port,
param->AuxiliaryProcs = AuxiliaryProcs;
param->PreparedXactProcs = PreparedXactProcs;
param->PMSignalState = PMSignalState;
- if (!write_inheritable_socket(¶m->pgStatSock, pgStatSock, childPid))
- return false;
param->PostmasterPid = PostmasterPid;
param->PgStartTime = PgStartTime;
@@ -6431,7 +6349,6 @@ restore_backend_variables(BackendParameters *param, Port *port)
AuxiliaryProcs = param->AuxiliaryProcs;
PreparedXactProcs = param->PreparedXactProcs;
PMSignalState = param->PMSignalState;
- read_inheritable_socket(&pgStatSock, ¶m->pgStatSock);
PostmasterPid = param->PostmasterPid;
PgStartTime = param->PgStartTime;
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 5880054245..04445c4c76 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -2000,7 +2000,7 @@ BufferSync(int flags)
if (SyncOneBuffer(buf_id, false, &wb_context) & BUF_WRITTEN)
{
TRACE_POSTGRESQL_BUFFER_SYNC_WRITTEN(buf_id);
- BgWriterStats.m_buf_written_checkpoints++;
+ BgWriterStats.buf_written_checkpoints++;
num_written++;
}
}
@@ -2110,7 +2110,7 @@ BgBufferSync(WritebackContext *wb_context)
strategy_buf_id = StrategySyncStart(&strategy_passes, &recent_alloc);
/* Report buffer alloc counts to pgstat */
- BgWriterStats.m_buf_alloc += recent_alloc;
+ BgWriterStats.buf_alloc += recent_alloc;
/*
* If we're not running the LRU scan, just stop after doing the stats
@@ -2300,7 +2300,7 @@ BgBufferSync(WritebackContext *wb_context)
reusable_buffers++;
if (++num_written >= bgwriter_lru_maxpages)
{
- BgWriterStats.m_maxwritten_clean++;
+ BgWriterStats.maxwritten_clean++;
break;
}
}
@@ -2308,7 +2308,7 @@ BgBufferSync(WritebackContext *wb_context)
reusable_buffers++;
}
- BgWriterStats.m_buf_written_clean += num_written;
+ BgWriterStats.buf_written_clean += num_written;
#ifdef BGW_DEBUG
elog(DEBUG1, "bgwriter: recent_alloc=%u smoothed=%.2f delta=%ld ahead=%d density=%.2f reusable_est=%d upcoming_est=%d scanned=%d wrote=%d reusable=%d",
diff --git a/src/backend/storage/ipc/ipci.c b/src/backend/storage/ipc/ipci.c
index 427b0d59cd..58a442f482 100644
--- a/src/backend/storage/ipc/ipci.c
+++ b/src/backend/storage/ipc/ipci.c
@@ -147,6 +147,7 @@ CreateSharedMemoryAndSemaphores(void)
size = add_size(size, BTreeShmemSize());
size = add_size(size, SyncScanShmemSize());
size = add_size(size, AsyncShmemSize());
+ size = add_size(size, StatsShmemSize());
#ifdef EXEC_BACKEND
size = add_size(size, ShmemBackendArraySize());
#endif
@@ -263,6 +264,7 @@ CreateSharedMemoryAndSemaphores(void)
BTreeShmemInit();
SyncScanShmemInit();
AsyncShmemInit();
+ StatsShmemInit();
#ifdef EXEC_BACKEND
diff --git a/src/backend/storage/lmgr/lwlock.c b/src/backend/storage/lmgr/lwlock.c
index 4c14e51c67..f61fd3e8ad 100644
--- a/src/backend/storage/lmgr/lwlock.c
+++ b/src/backend/storage/lmgr/lwlock.c
@@ -523,6 +523,7 @@ RegisterLWLockTranches(void)
LWLockRegisterTranche(LWTRANCHE_PARALLEL_APPEND, "parallel_append");
LWLockRegisterTranche(LWTRANCHE_PARALLEL_HASH_JOIN, "parallel_hash_join");
LWLockRegisterTranche(LWTRANCHE_SXACT, "serializable_xact");
+ LWLockRegisterTranche(LWTRANCHE_STATS, "activity_statistics");
/* Register named tranches. */
for (i = 0; i < NamedLWLockTrancheRequests; i++)
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 00c77b66c7..e2998f965e 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3189,6 +3189,12 @@ ProcessInterrupts(void)
if (ParallelMessagePending)
HandleParallelMessages();
+
+ if (IdleStatsUpdateTimeoutPending)
+ {
+ IdleStatsUpdateTimeoutPending = false;
+ pgstat_report_stat(true);
+ }
}
@@ -3763,6 +3769,7 @@ PostgresMain(int argc, char *argv[],
sigjmp_buf local_sigjmp_buf;
volatile bool send_ready_for_query = true;
bool disable_idle_in_transaction_timeout = false;
+ bool disable_idle_stats_update_timeout = false;
/* Initialize startup process environment if necessary. */
if (!IsUnderPostmaster)
@@ -4201,6 +4208,8 @@ PostgresMain(int argc, char *argv[],
}
else
{
+ long stats_timeout;
+
/* Send out notify signals and transmit self-notifies */
ProcessCompletedNotifies();
@@ -4213,8 +4222,13 @@ PostgresMain(int argc, char *argv[],
if (notifyInterruptPending)
ProcessNotifyInterrupt();
- pgstat_report_stat(false);
-
+ stats_timeout = pgstat_report_stat(false);
+ if (stats_timeout > 0)
+ {
+ disable_idle_stats_update_timeout = true;
+ enable_timeout_after(IDLE_STATS_UPDATE_TIMEOUT,
+ stats_timeout);
+ }
set_ps_display("idle");
pgstat_report_activity(STATE_IDLE, NULL);
}
@@ -4249,7 +4263,7 @@ PostgresMain(int argc, char *argv[],
DoingCommandRead = false;
/*
- * (5) turn off the idle-in-transaction timeout
+ * (5) turn off the idle-in-transaction timeout and stats update timeout
*/
if (disable_idle_in_transaction_timeout)
{
@@ -4257,6 +4271,12 @@ PostgresMain(int argc, char *argv[],
disable_idle_in_transaction_timeout = false;
}
+ if (disable_idle_stats_update_timeout)
+ {
+ disable_timeout(IDLE_STATS_UPDATE_TIMEOUT, false);
+ disable_idle_stats_update_timeout = false;
+ }
+
/*
* (6) check for any other interesting events that happened while we
* slept.
diff --git a/src/backend/utils/adt/pgstatfuncs.c b/src/backend/utils/adt/pgstatfuncs.c
index cea01534a5..a1304dc3ce 100644
--- a/src/backend/utils/adt/pgstatfuncs.c
+++ b/src/backend/utils/adt/pgstatfuncs.c
@@ -33,9 +33,6 @@
#define UINT32_ACCESS_ONCE(var) ((uint32)(*((volatile uint32 *)&(var))))
-/* Global bgwriter statistics, from bgwriter.c */
-extern PgStat_MsgBgWriter bgwriterStats;
-
Datum
pg_stat_get_numscans(PG_FUNCTION_ARGS)
{
@@ -1244,7 +1241,7 @@ pg_stat_get_db_xact_commit(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_xact_commit);
+ result = (int64) (dbentry->counts.n_xact_commit);
PG_RETURN_INT64(result);
}
@@ -1260,7 +1257,7 @@ pg_stat_get_db_xact_rollback(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_xact_rollback);
+ result = (int64) (dbentry->counts.n_xact_rollback);
PG_RETURN_INT64(result);
}
@@ -1276,7 +1273,7 @@ pg_stat_get_db_blocks_fetched(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_blocks_fetched);
+ result = (int64) (dbentry->counts.n_blocks_fetched);
PG_RETURN_INT64(result);
}
@@ -1292,7 +1289,7 @@ pg_stat_get_db_blocks_hit(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_blocks_hit);
+ result = (int64) (dbentry->counts.n_blocks_hit);
PG_RETURN_INT64(result);
}
@@ -1308,7 +1305,7 @@ pg_stat_get_db_tuples_returned(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_tuples_returned);
+ result = (int64) (dbentry->counts.n_tuples_returned);
PG_RETURN_INT64(result);
}
@@ -1324,7 +1321,7 @@ pg_stat_get_db_tuples_fetched(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_tuples_fetched);
+ result = (int64) (dbentry->counts.n_tuples_fetched);
PG_RETURN_INT64(result);
}
@@ -1340,7 +1337,7 @@ pg_stat_get_db_tuples_inserted(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_tuples_inserted);
+ result = (int64) (dbentry->counts.n_tuples_inserted);
PG_RETURN_INT64(result);
}
@@ -1356,7 +1353,7 @@ pg_stat_get_db_tuples_updated(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_tuples_updated);
+ result = (int64) (dbentry->counts.n_tuples_updated);
PG_RETURN_INT64(result);
}
@@ -1372,7 +1369,7 @@ pg_stat_get_db_tuples_deleted(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_tuples_deleted);
+ result = (int64) (dbentry->counts.n_tuples_deleted);
PG_RETURN_INT64(result);
}
@@ -1405,7 +1402,7 @@ pg_stat_get_db_temp_files(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = dbentry->n_temp_files;
+ result = dbentry->counts.n_temp_files;
PG_RETURN_INT64(result);
}
@@ -1421,7 +1418,7 @@ pg_stat_get_db_temp_bytes(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = dbentry->n_temp_bytes;
+ result = dbentry->counts.n_temp_bytes;
PG_RETURN_INT64(result);
}
@@ -1436,7 +1433,7 @@ pg_stat_get_db_conflict_tablespace(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_conflict_tablespace);
+ result = (int64) (dbentry->counts.n_conflict_tablespace);
PG_RETURN_INT64(result);
}
@@ -1451,7 +1448,7 @@ pg_stat_get_db_conflict_lock(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_conflict_lock);
+ result = (int64) (dbentry->counts.n_conflict_lock);
PG_RETURN_INT64(result);
}
@@ -1466,7 +1463,7 @@ pg_stat_get_db_conflict_snapshot(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_conflict_snapshot);
+ result = (int64) (dbentry->counts.n_conflict_snapshot);
PG_RETURN_INT64(result);
}
@@ -1481,7 +1478,7 @@ pg_stat_get_db_conflict_bufferpin(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_conflict_bufferpin);
+ result = (int64) (dbentry->counts.n_conflict_bufferpin);
PG_RETURN_INT64(result);
}
@@ -1496,7 +1493,7 @@ pg_stat_get_db_conflict_startup_deadlock(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_conflict_startup_deadlock);
+ result = (int64) (dbentry->counts.n_conflict_startup_deadlock);
PG_RETURN_INT64(result);
}
@@ -1511,11 +1508,11 @@ pg_stat_get_db_conflict_all(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_conflict_tablespace +
- dbentry->n_conflict_lock +
- dbentry->n_conflict_snapshot +
- dbentry->n_conflict_bufferpin +
- dbentry->n_conflict_startup_deadlock);
+ result = (int64) (dbentry->counts.n_conflict_tablespace +
+ dbentry->counts.n_conflict_lock +
+ dbentry->counts.n_conflict_snapshot +
+ dbentry->counts.n_conflict_bufferpin +
+ dbentry->counts.n_conflict_startup_deadlock);
PG_RETURN_INT64(result);
}
@@ -1530,7 +1527,7 @@ pg_stat_get_db_deadlocks(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_deadlocks);
+ result = (int64) (dbentry->counts.n_deadlocks);
PG_RETURN_INT64(result);
}
@@ -1548,7 +1545,7 @@ pg_stat_get_db_checksum_failures(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = (int64) (dbentry->n_checksum_failures);
+ result = (int64) (dbentry->counts.n_checksum_failures);
PG_RETURN_INT64(result);
}
@@ -1585,7 +1582,7 @@ pg_stat_get_db_blk_read_time(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = ((double) dbentry->n_block_read_time) / 1000.0;
+ result = ((double) dbentry->counts.n_block_read_time) / 1000.0;
PG_RETURN_FLOAT8(result);
}
@@ -1601,7 +1598,7 @@ pg_stat_get_db_blk_write_time(PG_FUNCTION_ARGS)
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) == NULL)
result = 0;
else
- result = ((double) dbentry->n_block_write_time) / 1000.0;
+ result = ((double) dbentry->counts.n_block_write_time) / 1000.0;
PG_RETURN_FLOAT8(result);
}
diff --git a/src/backend/utils/init/globals.c b/src/backend/utils/init/globals.c
index eb19644419..51748c99ad 100644
--- a/src/backend/utils/init/globals.c
+++ b/src/backend/utils/init/globals.c
@@ -33,6 +33,7 @@ volatile sig_atomic_t ProcDiePending = false;
volatile sig_atomic_t ClientConnectionLost = false;
volatile sig_atomic_t IdleInTransactionSessionTimeoutPending = false;
volatile sig_atomic_t ProcSignalBarrierPending = false;
+volatile sig_atomic_t IdleStatsUpdateTimeoutPending = false;
volatile uint32 InterruptHoldoffCount = 0;
volatile uint32 QueryCancelHoldoffCount = 0;
volatile uint32 CritSectionCount = 0;
diff --git a/src/backend/utils/init/postinit.c b/src/backend/utils/init/postinit.c
index f4247ea70d..f65d05c24c 100644
--- a/src/backend/utils/init/postinit.c
+++ b/src/backend/utils/init/postinit.c
@@ -73,6 +73,7 @@ static void ShutdownPostgres(int code, Datum arg);
static void StatementTimeoutHandler(void);
static void LockTimeoutHandler(void);
static void IdleInTransactionSessionTimeoutHandler(void);
+static void IdleStatsUpdateTimeoutHandler(void);
static bool ThereIsAtLeastOneRole(void);
static void process_startup_options(Port *port, bool am_superuser);
static void process_settings(Oid databaseid, Oid roleid);
@@ -631,6 +632,8 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
IdleInTransactionSessionTimeoutHandler);
+ RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
+ IdleStatsUpdateTimeoutHandler);
}
/*
@@ -1241,6 +1244,14 @@ IdleInTransactionSessionTimeoutHandler(void)
SetLatch(MyLatch);
}
+static void
+IdleStatsUpdateTimeoutHandler(void)
+{
+ IdleStatsUpdateTimeoutPending = true;
+ InterruptPending = true;
+ SetLatch(MyLatch);
+}
+
/*
* Returns true if at least one role is defined in this database cluster.
*/
diff --git a/src/bin/pg_basebackup/t/010_pg_basebackup.pl b/src/bin/pg_basebackup/t/010_pg_basebackup.pl
index 3c70499feb..927ae319b1 100644
--- a/src/bin/pg_basebackup/t/010_pg_basebackup.pl
+++ b/src/bin/pg_basebackup/t/010_pg_basebackup.pl
@@ -6,7 +6,7 @@ use File::Basename qw(basename dirname);
use File::Path qw(rmtree);
use PostgresNode;
use TestLib;
-use Test::More tests => 107;
+use Test::More tests => 106;
program_help_ok('pg_basebackup');
program_version_ok('pg_basebackup');
@@ -123,7 +123,7 @@ is_deeply(
# Contents of these directories should not be copied.
foreach my $dirname (
- qw(pg_dynshmem pg_notify pg_replslot pg_serial pg_snapshots pg_stat_tmp pg_subtrans)
+ qw(pg_dynshmem pg_notify pg_replslot pg_serial pg_snapshots pg_subtrans)
)
{
is_deeply(
diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
index 619b2f9c71..9f1de1e42f 100644
--- a/src/include/miscadmin.h
+++ b/src/include/miscadmin.h
@@ -83,6 +83,8 @@ extern PGDLLIMPORT volatile sig_atomic_t QueryCancelPending;
extern PGDLLIMPORT volatile sig_atomic_t ProcDiePending;
extern PGDLLIMPORT volatile sig_atomic_t IdleInTransactionSessionTimeoutPending;
extern PGDLLIMPORT volatile sig_atomic_t ProcSignalBarrierPending;
+extern PGDLLIMPORT volatile sig_atomic_t IdleStatsUpdateTimeoutPending;
+extern PGDLLIMPORT volatile sig_atomic_t ConfigReloadPending;
extern PGDLLIMPORT volatile sig_atomic_t ClientConnectionLost;
diff --git a/src/include/pgstat.h b/src/include/pgstat.h
index 1a19921f80..4e137140bd 100644
--- a/src/include/pgstat.h
+++ b/src/include/pgstat.h
@@ -1,7 +1,7 @@
/* ----------
* pgstat.h
*
- * Definitions for the PostgreSQL statistics collector daemon.
+ * Definitions for the PostgreSQL activity statistics facility.
*
* Copyright (c) 2001-2020, PostgreSQL Global Development Group
*
@@ -15,9 +15,11 @@
#include "libpq/pqcomm.h"
#include "miscadmin.h"
#include "port/atomics.h"
+#include "lib/dshash.h"
#include "portability/instr_time.h"
#include "postmaster/pgarch.h"
#include "storage/proc.h"
+#include "storage/lwlock.h"
#include "utils/hsearch.h"
#include "utils/relcache.h"
@@ -41,33 +43,6 @@ typedef enum TrackFunctionsLevel
TRACK_FUNC_ALL
} TrackFunctionsLevel;
-/* ----------
- * The types of backend -> collector messages
- * ----------
- */
-typedef enum StatMsgType
-{
- PGSTAT_MTYPE_DUMMY,
- PGSTAT_MTYPE_INQUIRY,
- PGSTAT_MTYPE_TABSTAT,
- PGSTAT_MTYPE_TABPURGE,
- PGSTAT_MTYPE_DROPDB,
- PGSTAT_MTYPE_RESETCOUNTER,
- PGSTAT_MTYPE_RESETSHAREDCOUNTER,
- PGSTAT_MTYPE_RESETSINGLECOUNTER,
- PGSTAT_MTYPE_AUTOVAC_START,
- PGSTAT_MTYPE_VACUUM,
- PGSTAT_MTYPE_ANALYZE,
- PGSTAT_MTYPE_ARCHIVER,
- PGSTAT_MTYPE_BGWRITER,
- PGSTAT_MTYPE_FUNCSTAT,
- PGSTAT_MTYPE_FUNCPURGE,
- PGSTAT_MTYPE_RECOVERYCONFLICT,
- PGSTAT_MTYPE_TEMPFILE,
- PGSTAT_MTYPE_DEADLOCK,
- PGSTAT_MTYPE_CHECKSUMFAILURE
-} StatMsgType;
-
/* ----------
* The data type used for counters.
* ----------
@@ -78,9 +53,8 @@ typedef int64 PgStat_Counter;
* PgStat_TableCounts The actual per-table counts kept by a backend
*
* This struct should contain only actual event counters, because we memcmp
- * it against zeroes to detect whether there are any counts to transmit.
- * It is a component of PgStat_TableStatus (within-backend state) and
- * PgStat_TableEntry (the transmitted message format).
+ * it against zeroes to detect whether there are any counts to write.
+ * It is a component of PgStat_TableStatus (within-backend state).
*
* Note: for a table, tuples_returned is the number of tuples successfully
* fetched by heap_getnext, while tuples_fetched is the number of tuples
@@ -116,13 +90,6 @@ typedef struct PgStat_TableCounts
PgStat_Counter t_blocks_hit;
} PgStat_TableCounts;
-/* Possible targets for resetting cluster-wide shared values */
-typedef enum PgStat_Shared_Reset_Target
-{
- RESET_ARCHIVER,
- RESET_BGWRITER
-} PgStat_Shared_Reset_Target;
-
/* Possible object types for resetting single counters */
typedef enum PgStat_Single_Reset_Type
{
@@ -181,280 +148,32 @@ typedef struct PgStat_TableXactStatus
} PgStat_TableXactStatus;
-/* ------------------------------------------------------------
- * Message formats follow
- * ------------------------------------------------------------
- */
-
-
-/* ----------
- * PgStat_MsgHdr The common message header
- * ----------
- */
-typedef struct PgStat_MsgHdr
-{
- StatMsgType m_type;
- int m_size;
-} PgStat_MsgHdr;
-
-/* ----------
- * Space available in a message. This will keep the UDP packets below 1K,
- * which should fit unfragmented into the MTU of the loopback interface.
- * (Larger values of PGSTAT_MAX_MSG_SIZE would work for that on most
- * platforms, but we're being conservative here.)
- * ----------
- */
-#define PGSTAT_MAX_MSG_SIZE 1000
-#define PGSTAT_MSG_PAYLOAD (PGSTAT_MAX_MSG_SIZE - sizeof(PgStat_MsgHdr))
-
-
-/* ----------
- * PgStat_MsgDummy A dummy message, ignored by the collector
- * ----------
- */
-typedef struct PgStat_MsgDummy
-{
- PgStat_MsgHdr m_hdr;
-} PgStat_MsgDummy;
-
-
-/* ----------
- * PgStat_MsgInquiry Sent by a backend to ask the collector
- * to write the stats file(s).
- *
- * Ordinarily, an inquiry message prompts writing of the global stats file,
- * the stats file for shared catalogs, and the stats file for the specified
- * database. If databaseid is InvalidOid, only the first two are written.
- *
- * New file(s) will be written only if the existing file has a timestamp
- * older than the specified cutoff_time; this prevents duplicated effort
- * when multiple requests arrive at nearly the same time, assuming that
- * backends send requests with cutoff_times a little bit in the past.
- *
- * clock_time should be the requestor's current local time; the collector
- * uses this to check for the system clock going backward, but it has no
- * effect unless that occurs. We assume clock_time >= cutoff_time, though.
- * ----------
- */
-
-typedef struct PgStat_MsgInquiry
-{
- PgStat_MsgHdr m_hdr;
- TimestampTz clock_time; /* observed local clock time */
- TimestampTz cutoff_time; /* minimum acceptable file timestamp */
- Oid databaseid; /* requested DB (InvalidOid => shared only) */
-} PgStat_MsgInquiry;
-
-
-/* ----------
- * PgStat_TableEntry Per-table info in a MsgTabstat
- * ----------
- */
-typedef struct PgStat_TableEntry
-{
- Oid t_id;
- PgStat_TableCounts t_counts;
-} PgStat_TableEntry;
-
-/* ----------
- * PgStat_MsgTabstat Sent by the backend to report table
- * and buffer access statistics.
- * ----------
- */
-#define PGSTAT_NUM_TABENTRIES \
- ((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - 3 * sizeof(int) - 2 * sizeof(PgStat_Counter)) \
- / sizeof(PgStat_TableEntry))
-
-typedef struct PgStat_MsgTabstat
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
- int m_nentries;
- int m_xact_commit;
- int m_xact_rollback;
- PgStat_Counter m_block_read_time; /* times in microseconds */
- PgStat_Counter m_block_write_time;
- PgStat_TableEntry m_entry[PGSTAT_NUM_TABENTRIES];
-} PgStat_MsgTabstat;
-
-
-/* ----------
- * PgStat_MsgTabpurge Sent by the backend to tell the collector
- * about dead tables.
- * ----------
- */
-#define PGSTAT_NUM_TABPURGE \
- ((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - sizeof(int)) \
- / sizeof(Oid))
-
-typedef struct PgStat_MsgTabpurge
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
- int m_nentries;
- Oid m_tableid[PGSTAT_NUM_TABPURGE];
-} PgStat_MsgTabpurge;
-
-
-/* ----------
- * PgStat_MsgDropdb Sent by the backend to tell the collector
- * about a dropped database
- * ----------
- */
-typedef struct PgStat_MsgDropdb
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
-} PgStat_MsgDropdb;
-
-
-/* ----------
- * PgStat_MsgResetcounter Sent by the backend to tell the collector
- * to reset counters
- * ----------
- */
-typedef struct PgStat_MsgResetcounter
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
-} PgStat_MsgResetcounter;
-
-/* ----------
- * PgStat_MsgResetsharedcounter Sent by the backend to tell the collector
- * to reset a shared counter
- * ----------
- */
-typedef struct PgStat_MsgResetsharedcounter
-{
- PgStat_MsgHdr m_hdr;
- PgStat_Shared_Reset_Target m_resettarget;
-} PgStat_MsgResetsharedcounter;
-
-/* ----------
- * PgStat_MsgResetsinglecounter Sent by the backend to tell the collector
- * to reset a single counter
- * ----------
- */
-typedef struct PgStat_MsgResetsinglecounter
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
- PgStat_Single_Reset_Type m_resettype;
- Oid m_objectid;
-} PgStat_MsgResetsinglecounter;
-
-/* ----------
- * PgStat_MsgAutovacStart Sent by the autovacuum daemon to signal
- * that a database is going to be processed
- * ----------
- */
-typedef struct PgStat_MsgAutovacStart
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
- TimestampTz m_start_time;
-} PgStat_MsgAutovacStart;
-
-
-/* ----------
- * PgStat_MsgVacuum Sent by the backend or autovacuum daemon
- * after VACUUM
- * ----------
- */
-typedef struct PgStat_MsgVacuum
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
- Oid m_tableoid;
- bool m_autovacuum;
- TimestampTz m_vacuumtime;
- PgStat_Counter m_live_tuples;
- PgStat_Counter m_dead_tuples;
-} PgStat_MsgVacuum;
-
-
-/* ----------
- * PgStat_MsgAnalyze Sent by the backend or autovacuum daemon
- * after ANALYZE
- * ----------
- */
-typedef struct PgStat_MsgAnalyze
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
- Oid m_tableoid;
- bool m_autovacuum;
- bool m_resetcounter;
- TimestampTz m_analyzetime;
- PgStat_Counter m_live_tuples;
- PgStat_Counter m_dead_tuples;
-} PgStat_MsgAnalyze;
-
-
-/* ----------
- * PgStat_MsgArchiver Sent by the archiver to update statistics.
- * ----------
- */
-typedef struct PgStat_MsgArchiver
-{
- PgStat_MsgHdr m_hdr;
- bool m_failed; /* Failed attempt */
- char m_xlog[MAX_XFN_CHARS + 1];
- TimestampTz m_timestamp;
-} PgStat_MsgArchiver;
-
/* ----------
- * PgStat_MsgBgWriter Sent by the bgwriter to update statistics.
+ * PgStat_BgWriter bgwriter statistics
* ----------
*/
-typedef struct PgStat_MsgBgWriter
+typedef struct PgStat_BgWriter
{
- PgStat_MsgHdr m_hdr;
-
- PgStat_Counter m_timed_checkpoints;
- PgStat_Counter m_requested_checkpoints;
- PgStat_Counter m_buf_written_checkpoints;
- PgStat_Counter m_buf_written_clean;
- PgStat_Counter m_maxwritten_clean;
- PgStat_Counter m_buf_written_backend;
- PgStat_Counter m_buf_fsync_backend;
- PgStat_Counter m_buf_alloc;
- PgStat_Counter m_checkpoint_write_time; /* times in milliseconds */
- PgStat_Counter m_checkpoint_sync_time;
-} PgStat_MsgBgWriter;
-
-/* ----------
- * PgStat_MsgRecoveryConflict Sent by the backend upon recovery conflict
- * ----------
- */
-typedef struct PgStat_MsgRecoveryConflict
-{
- PgStat_MsgHdr m_hdr;
-
- Oid m_databaseid;
- int m_reason;
-} PgStat_MsgRecoveryConflict;
-
-/* ----------
- * PgStat_MsgTempFile Sent by the backend upon creating a temp file
- * ----------
- */
-typedef struct PgStat_MsgTempFile
-{
- PgStat_MsgHdr m_hdr;
-
- Oid m_databaseid;
- size_t m_filesize;
-} PgStat_MsgTempFile;
+ PgStat_Counter timed_checkpoints;
+ PgStat_Counter requested_checkpoints;
+ PgStat_Counter buf_written_checkpoints;
+ PgStat_Counter buf_written_clean;
+ PgStat_Counter maxwritten_clean;
+ PgStat_Counter buf_written_backend;
+ PgStat_Counter buf_fsync_backend;
+ PgStat_Counter buf_alloc;
+ PgStat_Counter checkpoint_write_time; /* times in milliseconds */
+ PgStat_Counter checkpoint_sync_time;
+} PgStat_BgWriter;
/* ----------
* PgStat_FunctionCounts The actual per-function counts kept by a backend
*
* This struct should contain only actual event counters, because we memcmp
- * it against zeroes to detect whether there are any counts to transmit.
+ * it against zeroes to detect whether there are any counts to write.
*
* Note that the time counters are in instr_time format here. We convert to
- * microseconds in PgStat_Counter format when transmitting to the collector.
+ * microseconds in PgStat_Counter format when writing to shared statsitics.
* ----------
*/
typedef struct PgStat_FunctionCounts
@@ -486,96 +205,8 @@ typedef struct PgStat_FunctionEntry
PgStat_Counter f_self_time;
} PgStat_FunctionEntry;
-/* ----------
- * PgStat_MsgFuncstat Sent by the backend to report function
- * usage statistics.
- * ----------
- */
-#define PGSTAT_NUM_FUNCENTRIES \
- ((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - sizeof(int)) \
- / sizeof(PgStat_FunctionEntry))
-
-typedef struct PgStat_MsgFuncstat
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
- int m_nentries;
- PgStat_FunctionEntry m_entry[PGSTAT_NUM_FUNCENTRIES];
-} PgStat_MsgFuncstat;
-
-/* ----------
- * PgStat_MsgFuncpurge Sent by the backend to tell the collector
- * about dead functions.
- * ----------
- */
-#define PGSTAT_NUM_FUNCPURGE \
- ((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - sizeof(int)) \
- / sizeof(Oid))
-
-typedef struct PgStat_MsgFuncpurge
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
- int m_nentries;
- Oid m_functionid[PGSTAT_NUM_FUNCPURGE];
-} PgStat_MsgFuncpurge;
-
-/* ----------
- * PgStat_MsgDeadlock Sent by the backend to tell the collector
- * about a deadlock that occurred.
- * ----------
- */
-typedef struct PgStat_MsgDeadlock
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
-} PgStat_MsgDeadlock;
-
-/* ----------
- * PgStat_MsgChecksumFailure Sent by the backend to tell the collector
- * about checksum failures noticed.
- * ----------
- */
-typedef struct PgStat_MsgChecksumFailure
-{
- PgStat_MsgHdr m_hdr;
- Oid m_databaseid;
- int m_failurecount;
- TimestampTz m_failure_time;
-} PgStat_MsgChecksumFailure;
-
-
-/* ----------
- * PgStat_Msg Union over all possible messages.
- * ----------
- */
-typedef union PgStat_Msg
-{
- PgStat_MsgHdr msg_hdr;
- PgStat_MsgDummy msg_dummy;
- PgStat_MsgInquiry msg_inquiry;
- PgStat_MsgTabstat msg_tabstat;
- PgStat_MsgTabpurge msg_tabpurge;
- PgStat_MsgDropdb msg_dropdb;
- PgStat_MsgResetcounter msg_resetcounter;
- PgStat_MsgResetsharedcounter msg_resetsharedcounter;
- PgStat_MsgResetsinglecounter msg_resetsinglecounter;
- PgStat_MsgAutovacStart msg_autovacuum_start;
- PgStat_MsgVacuum msg_vacuum;
- PgStat_MsgAnalyze msg_analyze;
- PgStat_MsgArchiver msg_archiver;
- PgStat_MsgBgWriter msg_bgwriter;
- PgStat_MsgFuncstat msg_funcstat;
- PgStat_MsgFuncpurge msg_funcpurge;
- PgStat_MsgRecoveryConflict msg_recoveryconflict;
- PgStat_MsgDeadlock msg_deadlock;
- PgStat_MsgTempFile msg_tempfile;
- PgStat_MsgChecksumFailure msg_checksumfailure;
-} PgStat_Msg;
-
-
/* ------------------------------------------------------------
- * Statistic collector data structures follow
+ * Activity statistics data structures on file and shared memory follow
*
* PGSTAT_FILE_FORMAT_ID should be changed whenever any of these
* data structures change.
@@ -584,13 +215,9 @@ typedef union PgStat_Msg
#define PGSTAT_FILE_FORMAT_ID 0x01A5BC9D
-/* ----------
- * PgStat_StatDBEntry The collector's data per database
- * ----------
- */
-typedef struct PgStat_StatDBEntry
+
+typedef struct PgStat_StatDBCounts
{
- Oid databaseid;
PgStat_Counter n_xact_commit;
PgStat_Counter n_xact_rollback;
PgStat_Counter n_blocks_fetched;
@@ -600,7 +227,6 @@ typedef struct PgStat_StatDBEntry
PgStat_Counter n_tuples_inserted;
PgStat_Counter n_tuples_updated;
PgStat_Counter n_tuples_deleted;
- TimestampTz last_autovac_time;
PgStat_Counter n_conflict_tablespace;
PgStat_Counter n_conflict_lock;
PgStat_Counter n_conflict_snapshot;
@@ -610,29 +236,52 @@ typedef struct PgStat_StatDBEntry
PgStat_Counter n_temp_bytes;
PgStat_Counter n_deadlocks;
PgStat_Counter n_checksum_failures;
- TimestampTz last_checksum_failure;
PgStat_Counter n_block_read_time; /* times in microseconds */
PgStat_Counter n_block_write_time;
+} PgStat_StatDBCounts;
+/* ----------
+ * PgStat_StatDBEntry The statistics per database
+ * ----------
+ */
+typedef struct PgStat_StatDBEntry
+{
+ Oid databaseid;
+ TimestampTz last_autovac_time;
+ TimestampTz last_checksum_failure;
TimestampTz stat_reset_timestamp;
- TimestampTz stats_timestamp; /* time of db stats file update */
+ TimestampTz stats_timestamp; /* time of db stats update */
+
+ PgStat_StatDBCounts counts;
/*
- * tables and functions must be last in the struct, because we don't write
- * the pointers out to the stats file.
+ * The followings must be last in the struct, because we don't write them
+ * out to the stats file.
*/
- HTAB *tables;
- HTAB *functions;
+ dshash_table_handle tables; /* current gen tables hash */
+ dshash_table_handle functions; /* current gen functions hash */
+ LWLock lock; /* Lock for the above members */
+
+ /* non-shared members */
+ HTAB *snapshot_tables; /* table entry snapshot */
+ HTAB *snapshot_functions; /* function entry snapshot */
+ dshash_table *dshash_tables; /* attached tables dshash */
+ dshash_table *dshash_functions; /* attached functions dshash */
} PgStat_StatDBEntry;
+#define SHARED_DBENT_SIZE offsetof(PgStat_StatDBEntry, snapshot_tables)
/* ----------
- * PgStat_StatTabEntry The collector's data per table (or index)
+ * PgStat_StatTabEntry The statistics per table (or index)
* ----------
*/
typedef struct PgStat_StatTabEntry
{
Oid tableid;
+ TimestampTz vacuum_timestamp; /* user initiated vacuum */
+ TimestampTz autovac_vacuum_timestamp; /* autovacuum initiated */
+ TimestampTz analyze_timestamp; /* user initiated */
+ TimestampTz autovac_analyze_timestamp; /* autovacuum initiated */
PgStat_Counter numscans;
@@ -651,19 +300,15 @@ typedef struct PgStat_StatTabEntry
PgStat_Counter blocks_fetched;
PgStat_Counter blocks_hit;
- TimestampTz vacuum_timestamp; /* user initiated vacuum */
PgStat_Counter vacuum_count;
- TimestampTz autovac_vacuum_timestamp; /* autovacuum initiated */
PgStat_Counter autovac_vacuum_count;
- TimestampTz analyze_timestamp; /* user initiated */
PgStat_Counter analyze_count;
- TimestampTz autovac_analyze_timestamp; /* autovacuum initiated */
PgStat_Counter autovac_analyze_count;
} PgStat_StatTabEntry;
/* ----------
- * PgStat_StatFuncEntry The collector's data per function
+ * PgStat_StatFuncEntry per function stats data
* ----------
*/
typedef struct PgStat_StatFuncEntry
@@ -678,7 +323,7 @@ typedef struct PgStat_StatFuncEntry
/*
- * Archiver statistics kept in the stats collector
+ * Archiver statistics kept in the shared stats
*/
typedef struct PgStat_ArchiverStats
{
@@ -694,7 +339,7 @@ typedef struct PgStat_ArchiverStats
} PgStat_ArchiverStats;
/*
- * Global statistics kept in the stats collector
+ * Global statistics kept in the shared stats
*/
typedef struct PgStat_GlobalStats
{
@@ -760,7 +405,6 @@ typedef enum
WAIT_EVENT_CHECKPOINTER_MAIN,
WAIT_EVENT_LOGICAL_APPLY_MAIN,
WAIT_EVENT_LOGICAL_LAUNCHER_MAIN,
- WAIT_EVENT_PGSTAT_MAIN,
WAIT_EVENT_RECOVERY_WAL_ALL,
WAIT_EVENT_RECOVERY_WAL_STREAM,
WAIT_EVENT_SYSLOGGER_MAIN,
@@ -1001,7 +645,7 @@ typedef struct PgBackendGSSStatus
*
* Each live backend maintains a PgBackendStatus struct in shared memory
* showing its current activity. (The structs are allocated according to
- * BackendId, but that is not critical.) Note that the collector process
+ * BackendId, but that is not critical.) Note that the stats-writing functions
* has no involvement in, or even access to, these structs.
*
* Each auxiliary process also maintains a PgBackendStatus struct in shared
@@ -1198,13 +842,15 @@ extern PGDLLIMPORT bool pgstat_track_counts;
extern PGDLLIMPORT int pgstat_track_functions;
extern PGDLLIMPORT int pgstat_track_activity_query_size;
extern char *pgstat_stat_directory;
+
+/* No longer used, but will be removed with GUC */
extern char *pgstat_stat_tmpname;
extern char *pgstat_stat_filename;
/*
* BgWriter statistics counters are updated directly by bgwriter and bufmgr
*/
-extern PgStat_MsgBgWriter BgWriterStats;
+extern PgStat_BgWriter BgWriterStats;
/*
* Updated by pgstat_count_buffer_*_time macros
@@ -1219,29 +865,26 @@ extern PgStat_Counter pgStatBlockWriteTime;
extern Size BackendStatusShmemSize(void);
extern void CreateSharedBackendStatus(void);
-extern void pgstat_init(void);
-extern int pgstat_start(void);
-extern void pgstat_reset_all(void);
-extern void allow_immediate_pgstat_restart(void);
+extern Size StatsShmemSize(void);
+extern void StatsShmemInit(void);
-#ifdef EXEC_BACKEND
-extern void PgstatCollectorMain(int argc, char *argv[]) pg_attribute_noreturn();
-#endif
+extern void pgstat_reset_all(void);
+/* File input/output functions */
+extern void pgstat_read_statsfiles(void);
+extern void pgstat_write_statsfiles(void);
/* ----------
* Functions called from backends
* ----------
*/
-extern void pgstat_ping(void);
-
-extern void pgstat_report_stat(bool force);
+extern long pgstat_report_stat(bool force);
extern void pgstat_vacuum_stat(void);
extern void pgstat_drop_database(Oid databaseid);
extern void pgstat_clear_snapshot(void);
extern void pgstat_reset_counters(void);
-extern void pgstat_reset_shared_counters(const char *);
+extern void pgstat_reset_shared_counters(const char *target);
extern void pgstat_reset_single_counter(Oid objectid, PgStat_Single_Reset_Type type);
extern void pgstat_report_autovac(Oid dboid);
@@ -1402,8 +1045,8 @@ extern void pgstat_twophase_postcommit(TransactionId xid, uint16 info,
extern void pgstat_twophase_postabort(TransactionId xid, uint16 info,
void *recdata, uint32 len);
-extern void pgstat_send_archiver(const char *xlog, bool failed);
-extern void pgstat_send_bgwriter(void);
+extern void pgstat_report_archiver(const char *xlog, bool failed);
+extern void pgstat_report_bgwriter(void);
/* ----------
* Support functions for the SQL-callable functions to
@@ -1412,11 +1055,14 @@ extern void pgstat_send_bgwriter(void);
*/
extern PgStat_StatDBEntry *pgstat_fetch_stat_dbentry(Oid dbid);
extern PgStat_StatTabEntry *pgstat_fetch_stat_tabentry(Oid relid);
+extern PgStat_StatTabEntry *pgstat_fetch_stat_tabentry_snapshot(PgStat_StatDBEntry *dbent, Oid relid);
+extern void pgstat_copy_index_counters(Oid relid, PgStat_TableStatus *dst);
extern PgBackendStatus *pgstat_fetch_stat_beentry(int beid);
extern LocalPgBackendStatus *pgstat_fetch_stat_local_beentry(int beid);
extern PgStat_StatFuncEntry *pgstat_fetch_stat_funcentry(Oid funcid);
extern int pgstat_fetch_stat_numbackends(void);
extern PgStat_ArchiverStats *pgstat_fetch_stat_archiver(void);
extern PgStat_GlobalStats *pgstat_fetch_global(void);
+extern void pgstat_clear_snapshot(void);
#endif /* PGSTAT_H */
diff --git a/src/include/storage/lwlock.h b/src/include/storage/lwlock.h
index 8fda8e4f78..13371e8cb7 100644
--- a/src/include/storage/lwlock.h
+++ b/src/include/storage/lwlock.h
@@ -220,6 +220,7 @@ typedef enum BuiltinTrancheIds
LWTRANCHE_TBM,
LWTRANCHE_PARALLEL_APPEND,
LWTRANCHE_SXACT,
+ LWTRANCHE_STATS,
LWTRANCHE_FIRST_USER_DEFINED
} BuiltinTrancheIds;
diff --git a/src/include/utils/timeout.h b/src/include/utils/timeout.h
index 83a15f6795..77d1572a99 100644
--- a/src/include/utils/timeout.h
+++ b/src/include/utils/timeout.h
@@ -31,6 +31,7 @@ typedef enum TimeoutId
STANDBY_TIMEOUT,
STANDBY_LOCK_TIMEOUT,
IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
+ IDLE_STATS_UPDATE_TIMEOUT,
/* First user-definable timeout reason */
USER_TIMEOUT,
/* Maximum number of timeout reasons */
--
2.18.2
----Next_Part(Thu_Mar_19_20_30_04_2020_284)--
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Content-Transfer-Encoding: 7bit
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filename="v25-0007-Doc-part-of-shared-memory-based-stats-collector.patch"
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