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autovacuum.c File Reference
#include "postgres.h"
#include <signal.h>
#include <sys/time.h>
#include <unistd.h>
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/multixact.h"
#include "access/reloptions.h"
#include "access/transam.h"
#include "access/xact.h"
#include "catalog/dependency.h"
#include "catalog/namespace.h"
#include "catalog/pg_database.h"
#include "commands/dbcommands.h"
#include "commands/vacuum.h"
#include "lib/ilist.h"
#include "libpq/pqsignal.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/fork_process.h"
#include "postmaster/postmaster.h"
#include "storage/bufmgr.h"
#include "storage/ipc.h"
#include "storage/latch.h"
#include "storage/lmgr.h"
#include "storage/pmsignal.h"
#include "storage/proc.h"
#include "storage/procsignal.h"
#include "storage/sinvaladt.h"
#include "storage/smgr.h"
#include "tcop/tcopprot.h"
#include "utils/dsa.h"
#include "utils/fmgroids.h"
#include "utils/fmgrprotos.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/ps_status.h"
#include "utils/rel.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"
#include "utils/timeout.h"
#include "utils/timestamp.h"
#include "utils/tqual.h"
Include dependency graph for autovacuum.c:

Go to the source code of this file.

Data Structures

struct  avl_dbase
 
struct  avw_dbase
 
struct  av_relation
 
struct  autovac_table
 
struct  WorkerInfoData
 
struct  AutoVacuumWorkItem
 
struct  AutoVacuumShmemStruct
 

Macros

#define STATS_READ_DELAY   1000
 
#define MIN_AUTOVAC_SLEEPTIME   100.0 /* milliseconds */
 
#define MAX_AUTOVAC_SLEEPTIME   300 /* seconds */
 
#define NUM_WORKITEMS   256
 
#define MAX_AUTOVAC_ACTIV_LEN   (NAMEDATALEN * 2 + 56)
 

Typedefs

typedef struct avl_dbase avl_dbase
 
typedef struct avw_dbase avw_dbase
 
typedef struct av_relation av_relation
 
typedef struct autovac_table autovac_table
 
typedef struct WorkerInfoData WorkerInfoData
 
typedef struct WorkerInfoDataWorkerInfo
 
typedef struct AutoVacuumWorkItem AutoVacuumWorkItem
 

Enumerations

enum  AutoVacuumSignal { AutoVacForkFailed, AutoVacRebalance, AutoVacNumSignals }
 

Functions

NON_EXEC_STATIC void AutoVacWorkerMain (int argc, char *argv[]) pg_attribute_noreturn()
 
NON_EXEC_STATIC void AutoVacLauncherMain (int argc, char *argv[]) pg_attribute_noreturn()
 
static Oid do_start_worker (void)
 
static void launcher_determine_sleep (bool canlaunch, bool recursing, struct timeval *nap)
 
static void launch_worker (TimestampTz now)
 
static Listget_database_list (void)
 
static void rebuild_database_list (Oid newdb)
 
static int db_comparator (const void *a, const void *b)
 
static void autovac_balance_cost (void)
 
static void do_autovacuum (void)
 
static void FreeWorkerInfo (int code, Datum arg)
 
static autovac_tabletable_recheck_autovac (Oid relid, HTAB *table_toast_map, TupleDesc pg_class_desc, int effective_multixact_freeze_max_age)
 
static void relation_needs_vacanalyze (Oid relid, AutoVacOpts *relopts, Form_pg_class classForm, PgStat_StatTabEntry *tabentry, int effective_multixact_freeze_max_age, bool *dovacuum, bool *doanalyze, bool *wraparound)
 
static void autovacuum_do_vac_analyze (autovac_table *tab, BufferAccessStrategy bstrategy)
 
static AutoVacOptsextract_autovac_opts (HeapTuple tup, TupleDesc pg_class_desc)
 
static PgStat_StatTabEntryget_pgstat_tabentry_relid (Oid relid, bool isshared, PgStat_StatDBEntry *shared, PgStat_StatDBEntry *dbentry)
 
static void perform_work_item (AutoVacuumWorkItem *workitem)
 
static void autovac_report_activity (autovac_table *tab)
 
static void autovac_report_workitem (AutoVacuumWorkItem *workitem, const char *nspname, const char *relname)
 
static void av_sighup_handler (SIGNAL_ARGS)
 
static void avl_sigusr2_handler (SIGNAL_ARGS)
 
static void avl_sigterm_handler (SIGNAL_ARGS)
 
static void autovac_refresh_stats (void)
 
int StartAutoVacLauncher (void)
 
void AutoVacWorkerFailed (void)
 
int StartAutoVacWorker (void)
 
void AutoVacuumUpdateDelay (void)
 
bool AutoVacuumingActive (void)
 
void AutoVacuumRequestWork (AutoVacuumWorkItemType type, Oid relationId, BlockNumber blkno)
 
void autovac_init (void)
 
bool IsAutoVacuumLauncherProcess (void)
 
bool IsAutoVacuumWorkerProcess (void)
 
Size AutoVacuumShmemSize (void)
 
void AutoVacuumShmemInit (void)
 

Variables

bool autovacuum_start_daemon = false
 
int autovacuum_max_workers
 
int autovacuum_work_mem = -1
 
int autovacuum_naptime
 
int autovacuum_vac_thresh
 
double autovacuum_vac_scale
 
int autovacuum_anl_thresh
 
double autovacuum_anl_scale
 
int autovacuum_freeze_max_age
 
int autovacuum_multixact_freeze_max_age
 
int autovacuum_vac_cost_delay
 
int autovacuum_vac_cost_limit
 
int Log_autovacuum_min_duration = -1
 
static bool am_autovacuum_launcher = false
 
static bool am_autovacuum_worker = false
 
static volatile sig_atomic_t got_SIGHUP = false
 
static volatile sig_atomic_t got_SIGUSR2 = false
 
static volatile sig_atomic_t got_SIGTERM = false
 
static TransactionId recentXid
 
static MultiXactId recentMulti
 
static int default_freeze_min_age
 
static int default_freeze_table_age
 
static int default_multixact_freeze_min_age
 
static int default_multixact_freeze_table_age
 
static MemoryContext AutovacMemCxt
 
static AutoVacuumShmemStructAutoVacuumShmem
 
static dlist_head DatabaseList = DLIST_STATIC_INIT(DatabaseList)
 
static MemoryContext DatabaseListCxt = NULL
 
static WorkerInfo MyWorkerInfo = NULL
 
int AutovacuumLauncherPid = 0
 

Macro Definition Documentation

#define MAX_AUTOVAC_ACTIV_LEN   (NAMEDATALEN * 2 + 56)
#define MAX_AUTOVAC_SLEEPTIME   300 /* seconds */

Definition at line 134 of file autovacuum.c.

Referenced by launcher_determine_sleep().

#define MIN_AUTOVAC_SLEEPTIME   100.0 /* milliseconds */

Definition at line 133 of file autovacuum.c.

Referenced by launcher_determine_sleep(), and rebuild_database_list().

#define NUM_WORKITEMS   256

Definition at line 264 of file autovacuum.c.

Referenced by AutoVacuumRequestWork(), AutoVacuumShmemInit(), and do_autovacuum().

#define STATS_READ_DELAY   1000

Definition at line 130 of file autovacuum.c.

Referenced by autovac_refresh_stats().

Typedef Documentation

Definition at line 234 of file autovacuum.c.

Enumeration Type Documentation

Enumerator
AutoVacForkFailed 
AutoVacRebalance 
AutoVacNumSignals 

Definition at line 241 of file autovacuum.c.

242 {
243  AutoVacForkFailed, /* failed trying to start a worker */
244  AutoVacRebalance, /* rebalance the cost limits */
245  AutoVacNumSignals /* must be last */
AutoVacuumSignal
Definition: autovacuum.c:241

Function Documentation

static void autovac_balance_cost ( void  )
static

Definition at line 1775 of file autovacuum.c.

References autovacuum_vac_cost_delay, autovacuum_vac_cost_limit, AutoVacuumShmemStruct::av_runningWorkers, dlist_iter::cur, DEBUG2, dlist_container, dlist_foreach, elog, Max, Min, NULL, PGPROC::pid, VacuumCostDelay, VacuumCostLimit, WorkerInfoData::wi_cost_delay, WorkerInfoData::wi_cost_limit, WorkerInfoData::wi_cost_limit_base, WorkerInfoData::wi_dboid, WorkerInfoData::wi_dobalance, WorkerInfoData::wi_proc, and WorkerInfoData::wi_tableoid.

Referenced by AutoVacLauncherMain(), and do_autovacuum().

1776 {
1777  /*
1778  * The idea here is that we ration out I/O equally. The amount of I/O
1779  * that a worker can consume is determined by cost_limit/cost_delay, so we
1780  * try to equalize those ratios rather than the raw limit settings.
1781  *
1782  * note: in cost_limit, zero also means use value from elsewhere, because
1783  * zero is not a valid value.
1784  */
1785  int vac_cost_limit = (autovacuum_vac_cost_limit > 0 ?
1787  int vac_cost_delay = (autovacuum_vac_cost_delay >= 0 ?
1789  double cost_total;
1790  double cost_avail;
1791  dlist_iter iter;
1792 
1793  /* not set? nothing to do */
1794  if (vac_cost_limit <= 0 || vac_cost_delay <= 0)
1795  return;
1796 
1797  /* calculate the total base cost limit of participating active workers */
1798  cost_total = 0.0;
1800  {
1801  WorkerInfo worker = dlist_container(WorkerInfoData, wi_links, iter.cur);
1802 
1803  if (worker->wi_proc != NULL &&
1804  worker->wi_dobalance &&
1805  worker->wi_cost_limit_base > 0 && worker->wi_cost_delay > 0)
1806  cost_total +=
1807  (double) worker->wi_cost_limit_base / worker->wi_cost_delay;
1808  }
1809 
1810  /* there are no cost limits -- nothing to do */
1811  if (cost_total <= 0)
1812  return;
1813 
1814  /*
1815  * Adjust cost limit of each active worker to balance the total of cost
1816  * limit to autovacuum_vacuum_cost_limit.
1817  */
1818  cost_avail = (double) vac_cost_limit / vac_cost_delay;
1820  {
1821  WorkerInfo worker = dlist_container(WorkerInfoData, wi_links, iter.cur);
1822 
1823  if (worker->wi_proc != NULL &&
1824  worker->wi_dobalance &&
1825  worker->wi_cost_limit_base > 0 && worker->wi_cost_delay > 0)
1826  {
1827  int limit = (int)
1828  (cost_avail * worker->wi_cost_limit_base / cost_total);
1829 
1830  /*
1831  * We put a lower bound of 1 on the cost_limit, to avoid division-
1832  * by-zero in the vacuum code. Also, in case of roundoff trouble
1833  * in these calculations, let's be sure we don't ever set
1834  * cost_limit to more than the base value.
1835  */
1836  worker->wi_cost_limit = Max(Min(limit,
1837  worker->wi_cost_limit_base),
1838  1);
1839  }
1840 
1841  if (worker->wi_proc != NULL)
1842  elog(DEBUG2, "autovac_balance_cost(pid=%u db=%u, rel=%u, dobalance=%s cost_limit=%d, cost_limit_base=%d, cost_delay=%d)",
1843  worker->wi_proc->pid, worker->wi_dboid, worker->wi_tableoid,
1844  worker->wi_dobalance ? "yes" : "no",
1845  worker->wi_cost_limit, worker->wi_cost_limit_base,
1846  worker->wi_cost_delay);
1847  }
1848 }
#define dlist_foreach(iter, lhead)
Definition: ilist.h:507
#define Min(x, y)
Definition: c.h:807
int autovacuum_vac_cost_limit
Definition: autovacuum.c:125
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
int VacuumCostLimit
Definition: globals.c:132
#define DEBUG2
Definition: elog.h:24
int autovacuum_vac_cost_delay
Definition: autovacuum.c:124
int wi_cost_limit_base
Definition: autovacuum.c:231
dlist_node * cur
Definition: ilist.h:161
int VacuumCostDelay
Definition: globals.c:133
#define Max(x, y)
Definition: c.h:801
#define NULL
Definition: c.h:229
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
PGPROC * wi_proc
Definition: autovacuum.c:225
#define elog
Definition: elog.h:219
dlist_head av_runningWorkers
Definition: autovacuum.c:287
int pid
Definition: proc.h:108
void autovac_init ( void  )

Definition at line 3224 of file autovacuum.c.

References autovacuum_start_daemon, ereport, errhint(), errmsg(), pgstat_track_counts, and WARNING.

Referenced by PostmasterMain().

3225 {
3227  ereport(WARNING,
3228  (errmsg("autovacuum not started because of misconfiguration"),
3229  errhint("Enable the \"track_counts\" option.")));
3230 }
int errhint(const char *fmt,...)
Definition: elog.c:987
bool autovacuum_start_daemon
Definition: autovacuum.c:113
bool pgstat_track_counts
Definition: pgstat.c:126
#define ereport(elevel, rest)
Definition: elog.h:122
#define WARNING
Definition: elog.h:40
int errmsg(const char *fmt,...)
Definition: elog.c:797
static void autovac_refresh_stats ( void  )
static

Definition at line 3322 of file autovacuum.c.

References GetCurrentTimestamp(), IsAutoVacuumLauncherProcess(), last_read, pgstat_clear_snapshot(), STATS_READ_DELAY, and TimestampDifferenceExceeds().

Referenced by do_start_worker(), rebuild_database_list(), and table_recheck_autovac().

3323 {
3325  {
3326  static TimestampTz last_read = 0;
3327  TimestampTz current_time;
3328 
3329  current_time = GetCurrentTimestamp();
3330 
3331  if (!TimestampDifferenceExceeds(last_read, current_time,
3333  return;
3334 
3335  last_read = current_time;
3336  }
3337 
3339 }
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1570
int64 TimestampTz
Definition: timestamp.h:39
WalTimeSample last_read[NUM_SYNC_REP_WAIT_MODE]
Definition: walsender.c:217
#define STATS_READ_DELAY
Definition: autovacuum.c:130
bool TimestampDifferenceExceeds(TimestampTz start_time, TimestampTz stop_time, int msec)
Definition: timestamp.c:1649
bool IsAutoVacuumLauncherProcess(void)
Definition: autovacuum.c:3238
void pgstat_clear_snapshot(void)
Definition: pgstat.c:5549
static void autovac_report_activity ( autovac_table tab)
static

Definition at line 3100 of file autovacuum.c.

References autovac_table::at_nspname, autovac_table::at_params, autovac_table::at_relname, autovac_table::at_vacoptions, VacuumParams::is_wraparound, MAX_AUTOVAC_ACTIV_LEN, pgstat_report_activity(), SetCurrentStatementStartTimestamp(), snprintf(), STATE_RUNNING, VACOPT_ANALYZE, and VACOPT_VACUUM.

Referenced by autovacuum_do_vac_analyze().

3101 {
3102 #define MAX_AUTOVAC_ACTIV_LEN (NAMEDATALEN * 2 + 56)
3103  char activity[MAX_AUTOVAC_ACTIV_LEN];
3104  int len;
3105 
3106  /* Report the command and possible options */
3107  if (tab->at_vacoptions & VACOPT_VACUUM)
3108  snprintf(activity, MAX_AUTOVAC_ACTIV_LEN,
3109  "autovacuum: VACUUM%s",
3110  tab->at_vacoptions & VACOPT_ANALYZE ? " ANALYZE" : "");
3111  else
3112  snprintf(activity, MAX_AUTOVAC_ACTIV_LEN,
3113  "autovacuum: ANALYZE");
3114 
3115  /*
3116  * Report the qualified name of the relation.
3117  */
3118  len = strlen(activity);
3119 
3120  snprintf(activity + len, MAX_AUTOVAC_ACTIV_LEN - len,
3121  " %s.%s%s", tab->at_nspname, tab->at_relname,
3122  tab->at_params.is_wraparound ? " (to prevent wraparound)" : "");
3123 
3124  /* Set statement_timestamp() to current time for pg_stat_activity */
3126 
3128 }
void pgstat_report_activity(BackendState state, const char *cmd_str)
Definition: pgstat.c:2994
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
char * at_relname
Definition: autovacuum.c:197
bool is_wraparound
Definition: vacuum.h:144
char * at_nspname
Definition: autovacuum.c:198
#define MAX_AUTOVAC_ACTIV_LEN
VacuumParams at_params
Definition: autovacuum.c:192
void SetCurrentStatementStartTimestamp(void)
Definition: xact.c:740
static void autovac_report_workitem ( AutoVacuumWorkItem workitem,
const char *  nspname,
const char *  relname 
)
static

Definition at line 3135 of file autovacuum.c.

References AutoVacuumWorkItem::avw_blockNumber, AVW_BRINSummarizeRange, AutoVacuumWorkItem::avw_type, BlockNumberIsValid, MAX_AUTOVAC_ACTIV_LEN, pgstat_report_activity(), SetCurrentStatementStartTimestamp(), snprintf(), and STATE_RUNNING.

Referenced by perform_work_item().

3137 {
3138  char activity[MAX_AUTOVAC_ACTIV_LEN + 12 + 2];
3139  char blk[12 + 2];
3140  int len;
3141 
3142  switch (workitem->avw_type)
3143  {
3145  snprintf(activity, MAX_AUTOVAC_ACTIV_LEN,
3146  "autovacuum: BRIN summarize");
3147  break;
3148  }
3149 
3150  /*
3151  * Report the qualified name of the relation, and the block number if any
3152  */
3153  len = strlen(activity);
3154 
3155  if (BlockNumberIsValid(workitem->avw_blockNumber))
3156  snprintf(blk, sizeof(blk), " %u", workitem->avw_blockNumber);
3157  else
3158  blk[0] = '\0';
3159 
3160  snprintf(activity + len, MAX_AUTOVAC_ACTIV_LEN - len,
3161  " %s.%s%s", nspname, relname, blk);
3162 
3163  /* Set statement_timestamp() to current time for pg_stat_activity */
3165 
3167 }
AutoVacuumWorkItemType avw_type
Definition: autovacuum.c:256
void pgstat_report_activity(BackendState state, const char *cmd_str)
Definition: pgstat.c:2994
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
#define MAX_AUTOVAC_ACTIV_LEN
BlockNumber avw_blockNumber
Definition: autovacuum.c:261
#define BlockNumberIsValid(blockNumber)
Definition: block.h:70
void SetCurrentStatementStartTimestamp(void)
Definition: xact.c:740
NON_EXEC_STATIC void AutoVacLauncherMain ( int  argc,
char *  argv[] 
)

Definition at line 432 of file autovacuum.c.

References AbortBufferIO(), AbortCurrentTransaction(), avl_dbase::adl_next_worker, ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate(), am_autovacuum_launcher, AtEOXact_Buffers(), AtEOXact_Files(), AtEOXact_HashTables(), AtEOXact_SMgr(), autovac_balance_cost(), AutoVacForkFailed, AutoVacRebalance, autovacuum_naptime, AutoVacuumingActive(), AutoVacuumShmemStruct::av_freeWorkers, AutoVacuumShmemStruct::av_launcherpid, av_sighup_handler(), AutoVacuumShmemStruct::av_signal, AutoVacuumShmemStruct::av_startingWorker, avl_sigterm_handler(), avl_sigusr2_handler(), BaseInit(), CurrentResourceOwner, DEBUG1, disable_all_timeouts(), dlist_init(), dlist_is_empty(), dlist_push_head(), dlist_tail_element, do_start_worker(), elog, EmitErrorReport(), ereport, errmsg(), error_context_stack, FloatExceptionHandler(), FlushErrorState(), GetCurrentTimestamp(), got_SIGHUP, got_SIGTERM, got_SIGUSR2, HOLD_INTERRUPTS, init_ps_display(), InitializeTimeouts(), InitPostgres(), InitProcess(), InitProcessing, InvalidOid, launch_worker(), launcher_determine_sleep(), LW_EXCLUSIVE, LW_SHARED, LWLockAcquire(), LWLockRelease(), LWLockReleaseAll(), MemoryContextResetAndDeleteChildren, MemoryContextSwitchTo(), Min, MyLatch, MyProcPid, NormalProcessing, NULL, PG_exception_stack, PG_SETMASK, pg_usleep(), PGC_S_OVERRIDE, PGC_SIGHUP, PGC_SUSET, pgstat_clear_snapshot(), pgstat_report_wait_end(), PMSIGNAL_START_AUTOVAC_WORKER, PostAuthDelay, pqsignal(), proc_exit(), ProcessCatchupInterrupt(), ProcessConfigFile(), procsignal_sigusr1_handler(), QueryCancelPending, quickdie(), rebuild_database_list(), ResetLatch(), RESOURCE_RELEASE_BEFORE_LOCKS, ResourceOwnerRelease(), RESUME_INTERRUPTS, SendPostmasterSignal(), SetConfigOption(), SetProcessingMode, SIG_DFL, SIG_IGN, SIGCHLD, SIGHUP, SIGPIPE, SIGQUIT, SIGUSR1, SIGUSR2, StatementCancelHandler(), TimestampDifferenceExceeds(), TopMemoryContext, UnBlockSig, UnlockBuffers(), WAIT_EVENT_AUTOVACUUM_MAIN, WaitLatch(), waittime, WARNING, WorkerInfoData::wi_dboid, WorkerInfoData::wi_launchtime, WorkerInfoData::wi_links, WorkerInfoData::wi_proc, WorkerInfoData::wi_sharedrel, WorkerInfoData::wi_tableoid, WL_LATCH_SET, WL_POSTMASTER_DEATH, and WL_TIMEOUT.

Referenced by StartAutoVacLauncher().

433 {
434  sigjmp_buf local_sigjmp_buf;
435 
436  am_autovacuum_launcher = true;
437 
438  /* Identify myself via ps */
439  init_ps_display("autovacuum launcher process", "", "", "");
440 
441  ereport(DEBUG1,
442  (errmsg("autovacuum launcher started")));
443 
444  if (PostAuthDelay)
445  pg_usleep(PostAuthDelay * 1000000L);
446 
448 
449  /*
450  * Set up signal handlers. We operate on databases much like a regular
451  * backend, so we use the same signal handling. See equivalent code in
452  * tcop/postgres.c.
453  */
456  pqsignal(SIGTERM, avl_sigterm_handler);
457 
459  InitializeTimeouts(); /* establishes SIGALRM handler */
460 
466 
467  /* Early initialization */
468  BaseInit();
469 
470  /*
471  * Create a per-backend PGPROC struct in shared memory, except in the
472  * EXEC_BACKEND case where this was done in SubPostmasterMain. We must do
473  * this before we can use LWLocks (and in the EXEC_BACKEND case we already
474  * had to do some stuff with LWLocks).
475  */
476 #ifndef EXEC_BACKEND
477  InitProcess();
478 #endif
479 
481 
483 
484  /*
485  * Create a memory context that we will do all our work in. We do this so
486  * that we can reset the context during error recovery and thereby avoid
487  * possible memory leaks.
488  */
490  "Autovacuum Launcher",
493 
494  /*
495  * If an exception is encountered, processing resumes here.
496  *
497  * This code is a stripped down version of PostgresMain error recovery.
498  */
499  if (sigsetjmp(local_sigjmp_buf, 1) != 0)
500  {
501  /* since not using PG_TRY, must reset error stack by hand */
503 
504  /* Prevents interrupts while cleaning up */
505  HOLD_INTERRUPTS();
506 
507  /* Forget any pending QueryCancel or timeout request */
508  disable_all_timeouts(false);
509  QueryCancelPending = false; /* second to avoid race condition */
510 
511  /* Report the error to the server log */
512  EmitErrorReport();
513 
514  /* Abort the current transaction in order to recover */
516 
517  /*
518  * Release any other resources, for the case where we were not in a
519  * transaction.
520  */
523  AbortBufferIO();
524  UnlockBuffers();
526  {
529  false, true);
530  /* we needn't bother with the other ResourceOwnerRelease phases */
531  }
532  AtEOXact_Buffers(false);
533  AtEOXact_SMgr();
534  AtEOXact_Files();
535  AtEOXact_HashTables(false);
536 
537  /*
538  * Now return to normal top-level context and clear ErrorContext for
539  * next time.
540  */
542  FlushErrorState();
543 
544  /* Flush any leaked data in the top-level context */
546 
547  /* don't leave dangling pointers to freed memory */
550 
551  /*
552  * Make sure pgstat also considers our stat data as gone. Note: we
553  * mustn't use autovac_refresh_stats here.
554  */
556 
557  /* Now we can allow interrupts again */
559 
560  /* if in shutdown mode, no need for anything further; just go away */
561  if (got_SIGTERM)
562  goto shutdown;
563 
564  /*
565  * Sleep at least 1 second after any error. We don't want to be
566  * filling the error logs as fast as we can.
567  */
568  pg_usleep(1000000L);
569  }
570 
571  /* We can now handle ereport(ERROR) */
572  PG_exception_stack = &local_sigjmp_buf;
573 
574  /* must unblock signals before calling rebuild_database_list */
576 
577  /*
578  * Force zero_damaged_pages OFF in the autovac process, even if it is set
579  * in postgresql.conf. We don't really want such a dangerous option being
580  * applied non-interactively.
581  */
582  SetConfigOption("zero_damaged_pages", "false", PGC_SUSET, PGC_S_OVERRIDE);
583 
584  /*
585  * Force settable timeouts off to avoid letting these settings prevent
586  * regular maintenance from being executed.
587  */
588  SetConfigOption("statement_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
589  SetConfigOption("lock_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
590  SetConfigOption("idle_in_transaction_session_timeout", "0",
592 
593  /*
594  * Force default_transaction_isolation to READ COMMITTED. We don't want
595  * to pay the overhead of serializable mode, nor add any risk of causing
596  * deadlocks or delaying other transactions.
597  */
598  SetConfigOption("default_transaction_isolation", "read committed",
600 
601  /*
602  * In emergency mode, just start a worker (unless shutdown was requested)
603  * and go away.
604  */
605  if (!AutoVacuumingActive())
606  {
607  if (!got_SIGTERM)
608  do_start_worker();
609  proc_exit(0); /* done */
610  }
611 
613 
614  /*
615  * Create the initial database list. The invariant we want this list to
616  * keep is that it's ordered by decreasing next_time. As soon as an entry
617  * is updated to a higher time, it will be moved to the front (which is
618  * correct because the only operation is to add autovacuum_naptime to the
619  * entry, and time always increases).
620  */
622 
623  /* loop until shutdown request */
624  while (!got_SIGTERM)
625  {
626  struct timeval nap;
627  TimestampTz current_time = 0;
628  bool can_launch;
629  int rc;
630 
631  /*
632  * This loop is a bit different from the normal use of WaitLatch,
633  * because we'd like to sleep before the first launch of a child
634  * process. So it's WaitLatch, then ResetLatch, then check for
635  * wakening conditions.
636  */
637 
639  false, &nap);
640 
641  /*
642  * Wait until naptime expires or we get some type of signal (all the
643  * signal handlers will wake us by calling SetLatch).
644  */
645  rc = WaitLatch(MyLatch,
647  (nap.tv_sec * 1000L) + (nap.tv_usec / 1000L),
649 
651 
652  /* Process sinval catchup interrupts that happened while sleeping */
654 
655  /*
656  * Emergency bailout if postmaster has died. This is to avoid the
657  * necessity for manual cleanup of all postmaster children.
658  */
659  if (rc & WL_POSTMASTER_DEATH)
660  proc_exit(1);
661 
662  /* the normal shutdown case */
663  if (got_SIGTERM)
664  break;
665 
666  if (got_SIGHUP)
667  {
668  got_SIGHUP = false;
670 
671  /* shutdown requested in config file? */
672  if (!AutoVacuumingActive())
673  break;
674 
675  /* rebalance in case the default cost parameters changed */
676  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
678  LWLockRelease(AutovacuumLock);
679 
680  /* rebuild the list in case the naptime changed */
682  }
683 
684  /*
685  * a worker finished, or postmaster signalled failure to start a
686  * worker
687  */
688  if (got_SIGUSR2)
689  {
690  got_SIGUSR2 = false;
691 
692  /* rebalance cost limits, if needed */
694  {
695  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
698  LWLockRelease(AutovacuumLock);
699  }
700 
702  {
703  /*
704  * If the postmaster failed to start a new worker, we sleep
705  * for a little while and resend the signal. The new worker's
706  * state is still in memory, so this is sufficient. After
707  * that, we restart the main loop.
708  *
709  * XXX should we put a limit to the number of times we retry?
710  * I don't think it makes much sense, because a future start
711  * of a worker will continue to fail in the same way.
712  */
714  pg_usleep(1000000L); /* 1s */
716  continue;
717  }
718  }
719 
720  /*
721  * There are some conditions that we need to check before trying to
722  * start a worker. First, we need to make sure that there is a worker
723  * slot available. Second, we need to make sure that no other worker
724  * failed while starting up.
725  */
726 
727  current_time = GetCurrentTimestamp();
728  LWLockAcquire(AutovacuumLock, LW_SHARED);
729 
731 
733  {
734  int waittime;
736 
737  /*
738  * We can't launch another worker when another one is still
739  * starting up (or failed while doing so), so just sleep for a bit
740  * more; that worker will wake us up again as soon as it's ready.
741  * We will only wait autovacuum_naptime seconds (up to a maximum
742  * of 60 seconds) for this to happen however. Note that failure
743  * to connect to a particular database is not a problem here,
744  * because the worker removes itself from the startingWorker
745  * pointer before trying to connect. Problems detected by the
746  * postmaster (like fork() failure) are also reported and handled
747  * differently. The only problems that may cause this code to
748  * fire are errors in the earlier sections of AutoVacWorkerMain,
749  * before the worker removes the WorkerInfo from the
750  * startingWorker pointer.
751  */
752  waittime = Min(autovacuum_naptime, 60) * 1000;
753  if (TimestampDifferenceExceeds(worker->wi_launchtime, current_time,
754  waittime))
755  {
756  LWLockRelease(AutovacuumLock);
757  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
758 
759  /*
760  * No other process can put a worker in starting mode, so if
761  * startingWorker is still INVALID after exchanging our lock,
762  * we assume it's the same one we saw above (so we don't
763  * recheck the launch time).
764  */
766  {
768  worker->wi_dboid = InvalidOid;
769  worker->wi_tableoid = InvalidOid;
770  worker->wi_sharedrel = false;
771  worker->wi_proc = NULL;
772  worker->wi_launchtime = 0;
774  &worker->wi_links);
776  elog(WARNING, "worker took too long to start; canceled");
777  }
778  }
779  else
780  can_launch = false;
781  }
782  LWLockRelease(AutovacuumLock); /* either shared or exclusive */
783 
784  /* if we can't do anything, just go back to sleep */
785  if (!can_launch)
786  continue;
787 
788  /* We're OK to start a new worker */
789 
791  {
792  /*
793  * Special case when the list is empty: start a worker right away.
794  * This covers the initial case, when no database is in pgstats
795  * (thus the list is empty). Note that the constraints in
796  * launcher_determine_sleep keep us from starting workers too
797  * quickly (at most once every autovacuum_naptime when the list is
798  * empty).
799  */
800  launch_worker(current_time);
801  }
802  else
803  {
804  /*
805  * because rebuild_database_list constructs a list with most
806  * distant adl_next_worker first, we obtain our database from the
807  * tail of the list.
808  */
809  avl_dbase *avdb;
810 
811  avdb = dlist_tail_element(avl_dbase, adl_node, &DatabaseList);
812 
813  /*
814  * launch a worker if next_worker is right now or it is in the
815  * past
816  */
818  current_time, 0))
819  launch_worker(current_time);
820  }
821  }
822 
823  /* Normal exit from the autovac launcher is here */
824 shutdown:
825  ereport(DEBUG1,
826  (errmsg("autovacuum launcher shutting down")));
828 
829  proc_exit(0); /* done */
830 }
void ProcessCatchupInterrupt(void)
Definition: sinval.c:177
void InitializeTimeouts(void)
Definition: timeout.c:340
int autovacuum_naptime
Definition: autovacuum.c:116
void AbortCurrentTransaction(void)
Definition: xact.c:2989
#define SIGUSR1
Definition: win32.h:202
TimestampTz adl_next_worker
Definition: autovacuum.c:162
#define DEBUG1
Definition: elog.h:25
int MyProcPid
Definition: globals.c:39
WorkerInfo av_startingWorker
Definition: autovacuum.c:288
static void autovac_balance_cost(void)
Definition: autovacuum.c:1775
sig_atomic_t av_signal[AutoVacNumSignals]
Definition: autovacuum.c:284
static bool am_autovacuum_launcher
Definition: autovacuum.c:137
#define WL_TIMEOUT
Definition: latch.h:127
void ProcessConfigFile(GucContext context)
dlist_head av_freeWorkers
Definition: autovacuum.c:286
int waittime
Definition: pg_standby.c:41
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1570
int64 TimestampTz
Definition: timestamp.h:39
void AtEOXact_Buffers(bool isCommit)
Definition: bufmgr.c:2415
ResourceOwner CurrentResourceOwner
Definition: resowner.c:138
TimestampTz wi_launchtime
Definition: autovacuum.c:226
static MemoryContext AutovacMemCxt
Definition: autovacuum.c:156
#define Min(x, y)
Definition: c.h:807
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
void proc_exit(int code)
Definition: ipc.c:99
static volatile sig_atomic_t got_SIGHUP
Definition: autovacuum.c:141
#define SetProcessingMode(mode)
Definition: miscadmin.h:374
void BaseInit(void)
Definition: postinit.c:517
dlist_node wi_links
Definition: autovacuum.c:222
void ResetLatch(volatile Latch *latch)
Definition: latch.c:497
volatile bool QueryCancelPending
Definition: globals.c:30
bool TimestampDifferenceExceeds(TimestampTz start_time, TimestampTz stop_time, int msec)
Definition: timestamp.c:1649
#define SIGQUIT
Definition: win32.h:189
void FlushErrorState(void)
Definition: elog.c:1587
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
void StatementCancelHandler(SIGNAL_ARGS)
Definition: postgres.c:2648
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1715
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:117
ErrorContextCallback * error_context_stack
Definition: elog.c:88
void pg_usleep(long microsec)
Definition: signal.c:53
void AtEOXact_SMgr(void)
Definition: smgr.c:798
int WaitLatch(volatile Latch *latch, int wakeEvents, long timeout, uint32 wait_event_info)
Definition: latch.c:336
#define SIG_IGN
Definition: win32.h:185
#define dlist_tail_element(type, membername, lhead)
Definition: ilist.h:496
void disable_all_timeouts(bool keep_indicators)
Definition: timeout.c:596
bool AutoVacuumingActive(void)
Definition: autovacuum.c:3175
void AtEOXact_Files(void)
Definition: fd.c:2617
Definition: guc.h:75
static volatile sig_atomic_t got_SIGTERM
Definition: autovacuum.c:143
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:165
void InitProcess(void)
Definition: proc.c:287
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:6683
sigset_t UnBlockSig
Definition: pqsignal.c:22
static void pgstat_report_wait_end(void)
Definition: pgstat.h:1235
static dlist_head DatabaseList
Definition: autovacuum.c:298
#define ereport(elevel, rest)
Definition: elog.h:122
MemoryContext TopMemoryContext
Definition: mcxt.c:43
Definition: guc.h:72
static void avl_sigusr2_handler(SIGNAL_ARGS)
Definition: autovacuum.c:1411
static void launcher_determine_sleep(bool canlaunch, bool recursing, struct timeval *nap)
Definition: autovacuum.c:840
#define WARNING
Definition: elog.h:40
void UnlockBuffers(void)
Definition: bufmgr.c:3518
#define MemoryContextResetAndDeleteChildren(ctx)
Definition: memutils.h:67
#define WL_POSTMASTER_DEATH
Definition: latch.h:128
MemoryContext AllocSetContextCreate(MemoryContext parent, const char *name, Size minContextSize, Size initBlockSize, Size maxBlockSize)
Definition: aset.c:322
int PostAuthDelay
Definition: postgres.c:99
void EmitErrorReport(void)
Definition: elog.c:1446
#define SIGPIPE
Definition: win32.h:193
#define SIGHUP
Definition: win32.h:188
#define InvalidOid
Definition: postgres_ext.h:36
static void dlist_init(dlist_head *head)
Definition: ilist.h:278
#define SIG_DFL
Definition: win32.h:183
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:168
static volatile sig_atomic_t got_SIGUSR2
Definition: autovacuum.c:142
#define NULL
Definition: c.h:229
void ResourceOwnerRelease(ResourceOwner owner, ResourceReleasePhase phase, bool isCommit, bool isTopLevel)
Definition: resowner.c:471
static bool dlist_is_empty(dlist_head *head)
Definition: ilist.h:289
void pgstat_clear_snapshot(void)
Definition: pgstat.c:5549
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1111
void AbortBufferIO(void)
Definition: bufmgr.c:3974
static void av_sighup_handler(SIGNAL_ARGS)
Definition: autovacuum.c:1399
sigjmp_buf * PG_exception_stack
Definition: elog.c:90
static void rebuild_database_list(Oid newdb)
Definition: autovacuum.c:924
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname)
Definition: postinit.c:558
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:115
static MemoryContext DatabaseListCxt
Definition: autovacuum.c:299
void FloatExceptionHandler(SIGNAL_ARGS)
Definition: postgres.c:2669
struct Latch * MyLatch
Definition: globals.c:52
PGPROC * wi_proc
Definition: autovacuum.c:225
static void launch_worker(TimestampTz now)
Definition: autovacuum.c:1340
void SendPostmasterSignal(PMSignalReason reason)
Definition: pmsignal.c:113
#define elog
Definition: elog.h:219
void LWLockReleaseAll(void)
Definition: lwlock.c:1814
void procsignal_sigusr1_handler(SIGNAL_ARGS)
Definition: procsignal.c:261
void AtEOXact_HashTables(bool isCommit)
Definition: dynahash.c:1830
#define SIGCHLD
Definition: win32.h:198
#define WL_LATCH_SET
Definition: latch.h:124
void quickdie(SIGNAL_ARGS)
Definition: postgres.c:2556
static Oid do_start_worker(void)
Definition: autovacuum.c:1125
#define SIGUSR2
Definition: win32.h:203
static void avl_sigterm_handler(SIGNAL_ARGS)
Definition: autovacuum.c:1423
void init_ps_display(const char *username, const char *dbname, const char *host_info, const char *initial_str)
Definition: ps_status.c:244
static void autovacuum_do_vac_analyze ( autovac_table tab,
BufferAccessStrategy  bstrategy 
)
static

Definition at line 3070 of file autovacuum.c.

References autovac_table::at_nspname, autovac_table::at_params, autovac_table::at_relid, autovac_table::at_relname, autovac_table::at_vacoptions, autovac_report_activity(), RangeVar::location, MemSet, NIL, RangeVar::relname, RangeVar::schemaname, and vacuum().

Referenced by do_autovacuum().

3071 {
3072  RangeVar rangevar;
3073 
3074  /* Set up command parameters --- use local variables instead of palloc */
3075  MemSet(&rangevar, 0, sizeof(rangevar));
3076 
3077  rangevar.schemaname = tab->at_nspname;
3078  rangevar.relname = tab->at_relname;
3079  rangevar.location = -1;
3080 
3081  /* Let pgstat know what we're doing */
3083 
3084  vacuum(tab->at_vacoptions, &rangevar, tab->at_relid, &tab->at_params, NIL,
3085  bstrategy, true);
3086 }
#define NIL
Definition: pg_list.h:69
#define MemSet(start, val, len)
Definition: c.h:858
char * schemaname
Definition: primnodes.h:67
int location
Definition: primnodes.h:73
char * relname
Definition: primnodes.h:68
char * at_relname
Definition: autovacuum.c:197
static void autovac_report_activity(autovac_table *tab)
Definition: autovacuum.c:3100
char * at_nspname
Definition: autovacuum.c:198
void vacuum(int options, RangeVar *relation, Oid relid, VacuumParams *params, List *va_cols, BufferAccessStrategy bstrategy, bool isTopLevel)
Definition: vacuum.c:149
VacuumParams at_params
Definition: autovacuum.c:192
bool AutoVacuumingActive ( void  )

Definition at line 3175 of file autovacuum.c.

References autovacuum_start_daemon, and pgstat_track_counts.

Referenced by AutoVacLauncherMain(), reaper(), relation_needs_vacanalyze(), and ServerLoop().

3176 {
3178  return false;
3179  return true;
3180 }
bool autovacuum_start_daemon
Definition: autovacuum.c:113
bool pgstat_track_counts
Definition: pgstat.c:126
void AutoVacuumRequestWork ( AutoVacuumWorkItemType  type,
Oid  relationId,
BlockNumber  blkno 
)

Definition at line 3186 of file autovacuum.c.

References AutoVacuumShmemStruct::av_workItems, AutoVacuumWorkItem::avw_active, AutoVacuumWorkItem::avw_blockNumber, AutoVacuumWorkItem::avw_database, AutoVacuumWorkItem::avw_relation, AutoVacuumWorkItem::avw_type, AutoVacuumWorkItem::avw_used, i, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), MyDatabaseId, and NUM_WORKITEMS.

Referenced by brininsert().

3188 {
3189  int i;
3190 
3191  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
3192 
3193  /*
3194  * Locate an unused work item and fill it with the given data.
3195  */
3196  for (i = 0; i < NUM_WORKITEMS; i++)
3197  {
3199 
3200  if (workitem->avw_used)
3201  continue;
3202 
3203  workitem->avw_used = true;
3204  workitem->avw_active = false;
3205  workitem->avw_type = type;
3206  workitem->avw_database = MyDatabaseId;
3207  workitem->avw_relation = relationId;
3208  workitem->avw_blockNumber = blkno;
3209 
3210  /* done */
3211  break;
3212  }
3213 
3214  LWLockRelease(AutovacuumLock);
3215 }
AutoVacuumWorkItemType avw_type
Definition: autovacuum.c:256
#define NUM_WORKITEMS
Definition: autovacuum.c:264
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1715
AutoVacuumWorkItem av_workItems[NUM_WORKITEMS]
Definition: autovacuum.c:289
Oid MyDatabaseId
Definition: globals.c:77
BlockNumber avw_blockNumber
Definition: autovacuum.c:261
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1111
int i
void AutoVacuumShmemInit ( void  )

Definition at line 3274 of file autovacuum.c.

References Assert, autovacuum_max_workers, AutoVacuumShmemSize(), AutoVacuumShmemStruct::av_freeWorkers, AutoVacuumShmemStruct::av_launcherpid, AutoVacuumShmemStruct::av_runningWorkers, AutoVacuumShmemStruct::av_startingWorker, AutoVacuumShmemStruct::av_workItems, dlist_init(), dlist_push_head(), i, IsUnderPostmaster, MAXALIGN, NULL, NUM_WORKITEMS, ShmemInitStruct(), and WorkerInfoData::wi_links.

Referenced by CreateSharedMemoryAndSemaphores().

3275 {
3276  bool found;
3277 
3279  ShmemInitStruct("AutoVacuum Data",
3281  &found);
3282 
3283  if (!IsUnderPostmaster)
3284  {
3285  WorkerInfo worker;
3286  int i;
3287 
3288  Assert(!found);
3289 
3294  memset(AutoVacuumShmem->av_workItems, 0,
3295  sizeof(AutoVacuumWorkItem) * NUM_WORKITEMS);
3296 
3297  worker = (WorkerInfo) ((char *) AutoVacuumShmem +
3298  MAXALIGN(sizeof(AutoVacuumShmemStruct)));
3299 
3300  /* initialize the WorkerInfo free list */
3301  for (i = 0; i < autovacuum_max_workers; i++)
3303  &worker[i].wi_links);
3304  }
3305  else
3306  Assert(found);
3307 }
#define NUM_WORKITEMS
Definition: autovacuum.c:264
WorkerInfo av_startingWorker
Definition: autovacuum.c:288
dlist_head av_freeWorkers
Definition: autovacuum.c:286
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
struct WorkerInfoData * WorkerInfo
Definition: autovacuum.c:234
dlist_node wi_links
Definition: autovacuum.c:222
void * ShmemInitStruct(const char *name, Size size, bool *foundPtr)
Definition: shmem.c:372
AutoVacuumWorkItem av_workItems[NUM_WORKITEMS]
Definition: autovacuum.c:289
bool IsUnderPostmaster
Definition: globals.c:101
Size AutoVacuumShmemSize(void)
Definition: autovacuum.c:3255
int autovacuum_max_workers
Definition: autovacuum.c:114
static void dlist_init(dlist_head *head)
Definition: ilist.h:278
#define NULL
Definition: c.h:229
#define Assert(condition)
Definition: c.h:676
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
#define MAXALIGN(LEN)
Definition: c.h:588
int i
dlist_head av_runningWorkers
Definition: autovacuum.c:287
Size AutoVacuumShmemSize ( void  )

Definition at line 3255 of file autovacuum.c.

References add_size(), autovacuum_max_workers, MAXALIGN, and mul_size().

Referenced by AutoVacuumShmemInit(), and CreateSharedMemoryAndSemaphores().

3256 {
3257  Size size;
3258 
3259  /*
3260  * Need the fixed struct and the array of WorkerInfoData.
3261  */
3262  size = sizeof(AutoVacuumShmemStruct);
3263  size = MAXALIGN(size);
3265  sizeof(WorkerInfoData)));
3266  return size;
3267 }
Size mul_size(Size s1, Size s2)
Definition: shmem.c:492
Size add_size(Size s1, Size s2)
Definition: shmem.c:475
int autovacuum_max_workers
Definition: autovacuum.c:114
size_t Size
Definition: c.h:356
#define MAXALIGN(LEN)
Definition: c.h:588
void AutoVacuumUpdateDelay ( void  )

Definition at line 1759 of file autovacuum.c.

References VacuumCostDelay, VacuumCostLimit, WorkerInfoData::wi_cost_delay, and WorkerInfoData::wi_cost_limit.

Referenced by do_autovacuum(), and vacuum_delay_point().

1760 {
1761  if (MyWorkerInfo)
1762  {
1765  }
1766 }
int VacuumCostLimit
Definition: globals.c:132
static WorkerInfo MyWorkerInfo
Definition: autovacuum.c:302
int VacuumCostDelay
Definition: globals.c:133
void AutoVacWorkerFailed ( void  )

Definition at line 1392 of file autovacuum.c.

References AutoVacForkFailed, and AutoVacuumShmemStruct::av_signal.

Referenced by StartAutovacuumWorker().

1393 {
1395 }
sig_atomic_t av_signal[AutoVacNumSignals]
Definition: autovacuum.c:284
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
NON_EXEC_STATIC void AutoVacWorkerMain ( int  argc,
char *  argv[] 
)

Definition at line 1514 of file autovacuum.c.

References am_autovacuum_worker, AutoVacuumShmemStruct::av_launcherpid, AutoVacuumShmemStruct::av_runningWorkers, av_sighup_handler(), AutoVacuumShmemStruct::av_startingWorker, BaseInit(), dbname, DEBUG1, die(), dlist_push_head(), do_autovacuum(), elog, EmitErrorReport(), ereport, errmsg(), FloatExceptionHandler(), FreeWorkerInfo(), HOLD_INTERRUPTS, init_ps_display(), InitializeTimeouts(), InitPostgres(), InitProcess(), InitProcessing, InvalidOid, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), MyProc, NAMEDATALEN, NormalProcessing, NULL, OidIsValid, on_shmem_exit(), PG_exception_stack, PG_SETMASK, pg_usleep(), PGC_S_OVERRIDE, PGC_SUSET, pgstat_report_autovac(), PostAuthDelay, pqsignal(), proc_exit(), procsignal_sigusr1_handler(), quickdie(), ReadNewTransactionId(), ReadNextMultiXactId(), recentMulti, recentXid, set_ps_display(), SetConfigOption(), SetProcessingMode, SIG_DFL, SIG_IGN, SIGCHLD, SIGHUP, SIGPIPE, SIGQUIT, SIGUSR1, SIGUSR2, StatementCancelHandler(), synchronous_commit, SYNCHRONOUS_COMMIT_LOCAL_FLUSH, UnBlockSig, WARNING, WorkerInfoData::wi_dboid, WorkerInfoData::wi_links, and WorkerInfoData::wi_proc.

Referenced by StartAutoVacWorker().

1515 {
1516  sigjmp_buf local_sigjmp_buf;
1517  Oid dbid;
1518 
1519  am_autovacuum_worker = true;
1520 
1521  /* Identify myself via ps */
1522  init_ps_display("autovacuum worker process", "", "", "");
1523 
1525 
1526  /*
1527  * Set up signal handlers. We operate on databases much like a regular
1528  * backend, so we use the same signal handling. See equivalent code in
1529  * tcop/postgres.c.
1530  */
1532 
1533  /*
1534  * SIGINT is used to signal canceling the current table's vacuum; SIGTERM
1535  * means abort and exit cleanly, and SIGQUIT means abandon ship.
1536  */
1538  pqsignal(SIGTERM, die);
1540  InitializeTimeouts(); /* establishes SIGALRM handler */
1541 
1547 
1548  /* Early initialization */
1549  BaseInit();
1550 
1551  /*
1552  * Create a per-backend PGPROC struct in shared memory, except in the
1553  * EXEC_BACKEND case where this was done in SubPostmasterMain. We must do
1554  * this before we can use LWLocks (and in the EXEC_BACKEND case we already
1555  * had to do some stuff with LWLocks).
1556  */
1557 #ifndef EXEC_BACKEND
1558  InitProcess();
1559 #endif
1560 
1561  /*
1562  * If an exception is encountered, processing resumes here.
1563  *
1564  * See notes in postgres.c about the design of this coding.
1565  */
1566  if (sigsetjmp(local_sigjmp_buf, 1) != 0)
1567  {
1568  /* Prevents interrupts while cleaning up */
1569  HOLD_INTERRUPTS();
1570 
1571  /* Report the error to the server log */
1572  EmitErrorReport();
1573 
1574  /*
1575  * We can now go away. Note that because we called InitProcess, a
1576  * callback was registered to do ProcKill, which will clean up
1577  * necessary state.
1578  */
1579  proc_exit(0);
1580  }
1581 
1582  /* We can now handle ereport(ERROR) */
1583  PG_exception_stack = &local_sigjmp_buf;
1584 
1586 
1587  /*
1588  * Force zero_damaged_pages OFF in the autovac process, even if it is set
1589  * in postgresql.conf. We don't really want such a dangerous option being
1590  * applied non-interactively.
1591  */
1592  SetConfigOption("zero_damaged_pages", "false", PGC_SUSET, PGC_S_OVERRIDE);
1593 
1594  /*
1595  * Force settable timeouts off to avoid letting these settings prevent
1596  * regular maintenance from being executed.
1597  */
1598  SetConfigOption("statement_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
1599  SetConfigOption("lock_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
1600  SetConfigOption("idle_in_transaction_session_timeout", "0",
1602 
1603  /*
1604  * Force default_transaction_isolation to READ COMMITTED. We don't want
1605  * to pay the overhead of serializable mode, nor add any risk of causing
1606  * deadlocks or delaying other transactions.
1607  */
1608  SetConfigOption("default_transaction_isolation", "read committed",
1610 
1611  /*
1612  * Force synchronous replication off to allow regular maintenance even if
1613  * we are waiting for standbys to connect. This is important to ensure we
1614  * aren't blocked from performing anti-wraparound tasks.
1615  */
1617  SetConfigOption("synchronous_commit", "local",
1619 
1620  /*
1621  * Get the info about the database we're going to work on.
1622  */
1623  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
1624 
1625  /*
1626  * beware of startingWorker being INVALID; this should normally not
1627  * happen, but if a worker fails after forking and before this, the
1628  * launcher might have decided to remove it from the queue and start
1629  * again.
1630  */
1632  {
1634  dbid = MyWorkerInfo->wi_dboid;
1636 
1637  /* insert into the running list */
1640 
1641  /*
1642  * remove from the "starting" pointer, so that the launcher can start
1643  * a new worker if required
1644  */
1646  LWLockRelease(AutovacuumLock);
1647 
1649 
1650  /* wake up the launcher */
1651  if (AutoVacuumShmem->av_launcherpid != 0)
1653  }
1654  else
1655  {
1656  /* no worker entry for me, go away */
1657  elog(WARNING, "autovacuum worker started without a worker entry");
1658  dbid = InvalidOid;
1659  LWLockRelease(AutovacuumLock);
1660  }
1661 
1662  if (OidIsValid(dbid))
1663  {
1664  char dbname[NAMEDATALEN];
1665 
1666  /*
1667  * Report autovac startup to the stats collector. We deliberately do
1668  * this before InitPostgres, so that the last_autovac_time will get
1669  * updated even if the connection attempt fails. This is to prevent
1670  * autovac from getting "stuck" repeatedly selecting an unopenable
1671  * database, rather than making any progress on stuff it can connect
1672  * to.
1673  */
1674  pgstat_report_autovac(dbid);
1675 
1676  /*
1677  * Connect to the selected database
1678  *
1679  * Note: if we have selected a just-deleted database (due to using
1680  * stale stats info), we'll fail and exit here.
1681  */
1682  InitPostgres(NULL, dbid, NULL, InvalidOid, dbname);
1684  set_ps_display(dbname, false);
1685  ereport(DEBUG1,
1686  (errmsg("autovacuum: processing database \"%s\"", dbname)));
1687 
1688  if (PostAuthDelay)
1689  pg_usleep(PostAuthDelay * 1000000L);
1690 
1691  /* And do an appropriate amount of work */
1694  do_autovacuum();
1695  }
1696 
1697  /*
1698  * The launcher will be notified of my death in ProcKill, *if* we managed
1699  * to get a worker slot at all
1700  */
1701 
1702  /* All done, go away */
1703  proc_exit(0);
1704 }
static bool am_autovacuum_worker
Definition: autovacuum.c:138
void InitializeTimeouts(void)
Definition: timeout.c:340
#define SIGUSR1
Definition: win32.h:202
#define DEBUG1
Definition: elog.h:25
WorkerInfo av_startingWorker
Definition: autovacuum.c:288
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
static void do_autovacuum(void)
Definition: autovacuum.c:1929
PGPROC * MyProc
Definition: proc.c:67
static MultiXactId recentMulti
Definition: autovacuum.c:147
void set_ps_display(const char *activity, bool force)
Definition: ps_status.c:326
void proc_exit(int code)
Definition: ipc.c:99
#define SetProcessingMode(mode)
Definition: miscadmin.h:374
void BaseInit(void)
Definition: postinit.c:517
dlist_node wi_links
Definition: autovacuum.c:222
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:538
#define SIGQUIT
Definition: win32.h:189
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
void StatementCancelHandler(SIGNAL_ARGS)
Definition: postgres.c:2648
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1715
#define NAMEDATALEN
void pg_usleep(long microsec)
Definition: signal.c:53
#define SIG_IGN
Definition: win32.h:185
Definition: guc.h:75
void InitProcess(void)
Definition: proc.c:287
void on_shmem_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:348
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:6683
TransactionId ReadNewTransactionId(void)
Definition: varsup.c:250
sigset_t UnBlockSig
Definition: pqsignal.c:22
static WorkerInfo MyWorkerInfo
Definition: autovacuum.c:302
int synchronous_commit
Definition: xact.c:82
#define ereport(elevel, rest)
Definition: elog.h:122
#define WARNING
Definition: elog.h:40
int PostAuthDelay
Definition: postgres.c:99
static TransactionId recentXid
Definition: autovacuum.c:146
void EmitErrorReport(void)
Definition: elog.c:1446
#define SIGPIPE
Definition: win32.h:193
#define SIGHUP
Definition: win32.h:188
#define InvalidOid
Definition: postgres_ext.h:36
#define SIG_DFL
Definition: win32.h:183
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:168
#define NULL
Definition: c.h:229
char * dbname
Definition: streamutil.c:39
static void FreeWorkerInfo(int code, Datum arg)
Definition: autovacuum.c:1710
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1111
static void av_sighup_handler(SIGNAL_ARGS)
Definition: autovacuum.c:1399
sigjmp_buf * PG_exception_stack
Definition: elog.c:90
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname)
Definition: postinit.c:558
int errmsg(const char *fmt,...)
Definition: elog.c:797
void die(SIGNAL_ARGS)
Definition: postgres.c:2617
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:115
void FloatExceptionHandler(SIGNAL_ARGS)
Definition: postgres.c:2669
PGPROC * wi_proc
Definition: autovacuum.c:225
#define elog
Definition: elog.h:219
void procsignal_sigusr1_handler(SIGNAL_ARGS)
Definition: procsignal.c:261
dlist_head av_runningWorkers
Definition: autovacuum.c:287
#define SIGCHLD
Definition: win32.h:198
void pgstat_report_autovac(Oid dboid)
Definition: pgstat.c:1383
void quickdie(SIGNAL_ARGS)
Definition: postgres.c:2556
#define SIGUSR2
Definition: win32.h:203
void init_ps_display(const char *username, const char *dbname, const char *host_info, const char *initial_str)
Definition: ps_status.c:244
MultiXactId ReadNextMultiXactId(void)
Definition: multixact.c:721
static void av_sighup_handler ( SIGNAL_ARGS  )
static

Definition at line 1399 of file autovacuum.c.

References got_SIGHUP, MyLatch, and SetLatch().

Referenced by AutoVacLauncherMain(), and AutoVacWorkerMain().

1400 {
1401  int save_errno = errno;
1402 
1403  got_SIGHUP = true;
1404  SetLatch(MyLatch);
1405 
1406  errno = save_errno;
1407 }
static volatile sig_atomic_t got_SIGHUP
Definition: autovacuum.c:141
void SetLatch(volatile Latch *latch)
Definition: latch.c:414
struct Latch * MyLatch
Definition: globals.c:52
static void avl_sigterm_handler ( SIGNAL_ARGS  )
static

Definition at line 1423 of file autovacuum.c.

References got_SIGTERM, MyLatch, and SetLatch().

Referenced by AutoVacLauncherMain().

1424 {
1425  int save_errno = errno;
1426 
1427  got_SIGTERM = true;
1428  SetLatch(MyLatch);
1429 
1430  errno = save_errno;
1431 }
static volatile sig_atomic_t got_SIGTERM
Definition: autovacuum.c:143
void SetLatch(volatile Latch *latch)
Definition: latch.c:414
struct Latch * MyLatch
Definition: globals.c:52
static void avl_sigusr2_handler ( SIGNAL_ARGS  )
static

Definition at line 1411 of file autovacuum.c.

References got_SIGUSR2, MyLatch, and SetLatch().

Referenced by AutoVacLauncherMain().

1412 {
1413  int save_errno = errno;
1414 
1415  got_SIGUSR2 = true;
1416  SetLatch(MyLatch);
1417 
1418  errno = save_errno;
1419 }
static volatile sig_atomic_t got_SIGUSR2
Definition: autovacuum.c:142
void SetLatch(volatile Latch *latch)
Definition: latch.c:414
struct Latch * MyLatch
Definition: globals.c:52
static int db_comparator ( const void *  a,
const void *  b 
)
static

Definition at line 1105 of file autovacuum.c.

Referenced by rebuild_database_list().

1106 {
1107  if (((const avl_dbase *) a)->adl_score == ((const avl_dbase *) b)->adl_score)
1108  return 0;
1109  else
1110  return (((const avl_dbase *) a)->adl_score < ((const avl_dbase *) b)->adl_score) ? 1 : -1;
1111 }
static void do_autovacuum ( void  )
static

Definition at line 1929 of file autovacuum.c.

References AbortOutOfAnyTransaction(), AccessExclusiveLock, AccessShareLock, ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate(), Anum_pg_class_relkind, av_relation::ar_hasrelopts, av_relation::ar_relid, av_relation::ar_reloptions, autovac_table::at_datname, autovac_table::at_dobalance, autovac_table::at_nspname, autovac_table::at_relid, autovac_table::at_relname, autovac_table::at_sharedrel, autovac_table::at_vacoptions, autovac_table::at_vacuum_cost_delay, autovac_table::at_vacuum_cost_limit, autovac_balance_cost(), autovacuum_do_vac_analyze(), AutoVacuumUpdateDelay(), AutoVacuumShmemStruct::av_runningWorkers, AutoVacuumShmemStruct::av_workItems, AutoVacuumWorkItem::avw_active, AutoVacuumWorkItem::avw_used, BackendIdGetProc(), BAS_VACUUM, BTEqualStrategyNumber, CharGetDatum, CHECK_FOR_INTERRUPTS, CommitTransactionCommand(), ConditionalLockRelationOid(), CreateTupleDescCopy(), dlist_iter::cur, DATABASEOID, default_freeze_min_age, default_freeze_table_age, default_multixact_freeze_min_age, default_multixact_freeze_table_age, dlist_container, dlist_foreach, DROP_CASCADE, elog, EmitErrorReport(), HASHCTL::entrysize, ereport, errcontext, errmsg(), ERROR, extract_autovac_opts(), FlushErrorState(), ForwardScanDirection, get_database_name(), get_namespace_name(), get_pgstat_tabentry_relid(), get_rel_name(), get_rel_namespace(), GetAccessStrategy(), GETSTRUCT, GetTempNamespaceBackendId(), got_SIGHUP, HASH_BLOBS, hash_create(), HASH_ELEM, HASH_ENTER, HASH_FIND, hash_search(), heap_beginscan_catalog(), heap_close, heap_endscan(), heap_getnext(), heap_open(), HeapTupleGetOid, HeapTupleIsValid, HOLD_INTERRUPTS, i, InvalidBackendId, InvalidOid, HASHCTL::keysize, lappend_oid(), lfirst_oid, LOG, LW_EXCLUSIVE, LW_SHARED, LWLockAcquire(), LWLockRelease(), MemoryContextResetAndDeleteChildren, MemoryContextSwitchTo(), MemSet, MultiXactMemberFreezeThreshold(), MyBackendId, MyDatabaseId, NameStr, NIL, NULL, NUM_WORKITEMS, ObjectIdGetDatum, OidIsValid, PERFORM_DELETION_INTERNAL, PERFORM_DELETION_QUIETLY, PERFORM_DELETION_SKIP_EXTENSIONS, perform_work_item(), performDeletion(), pfree(), PG_CATCH, PG_END_TRY, PG_TRY, PGC_SIGHUP, pgstat_fetch_stat_dbentry(), pgstat_vacuum_stat(), PortalContext, ProcessConfigFile(), QueryCancelPending, relation_needs_vacanalyze(), RelationGetDescr, RelationRelationId, ReleaseSysCache(), RELKIND_MATVIEW, RELKIND_RELATION, RELKIND_TOASTVALUE, RELOID, RELPERSISTENCE_TEMP, RESUME_INTERRUPTS, ScanKeyInit(), SearchSysCache1, SearchSysCacheCopy1, StartTransactionCommand(), table_recheck_autovac(), TopMemoryContext, TopTransactionContext, UnlockRelationOid(), vac_update_datfrozenxid(), VACOPT_VACUUM, vacuum_freeze_min_age, vacuum_freeze_table_age, vacuum_multixact_freeze_min_age, vacuum_multixact_freeze_table_age, VacuumCostDelay, VacuumCostLimit, WorkerInfoData::wi_cost_delay, WorkerInfoData::wi_cost_limit, WorkerInfoData::wi_cost_limit_base, WorkerInfoData::wi_dboid, WorkerInfoData::wi_dobalance, WorkerInfoData::wi_sharedrel, and WorkerInfoData::wi_tableoid.

Referenced by AutoVacWorkerMain().

1930 {
1931  Relation classRel;
1932  HeapTuple tuple;
1933  HeapScanDesc relScan;
1934  Form_pg_database dbForm;
1935  List *table_oids = NIL;
1936  List *orphan_oids = NIL;
1937  HASHCTL ctl;
1938  HTAB *table_toast_map;
1939  ListCell *volatile cell;
1940  PgStat_StatDBEntry *shared;
1941  PgStat_StatDBEntry *dbentry;
1942  BufferAccessStrategy bstrategy;
1943  ScanKeyData key;
1944  TupleDesc pg_class_desc;
1945  int effective_multixact_freeze_max_age;
1946  bool did_vacuum = false;
1947  bool found_concurrent_worker = false;
1948  int i;
1949 
1950  /*
1951  * StartTransactionCommand and CommitTransactionCommand will automatically
1952  * switch to other contexts. We need this one to keep the list of
1953  * relations to vacuum/analyze across transactions.
1954  */
1956  "AV worker",
1959 
1960  /*
1961  * may be NULL if we couldn't find an entry (only happens if we are
1962  * forcing a vacuum for anti-wrap purposes).
1963  */
1965 
1966  /* Start a transaction so our commands have one to play into. */
1968 
1969  /*
1970  * Clean up any dead statistics collector entries for this DB. We always
1971  * want to do this exactly once per DB-processing cycle, even if we find
1972  * nothing worth vacuuming in the database.
1973  */
1975 
1976  /*
1977  * Compute the multixact age for which freezing is urgent. This is
1978  * normally autovacuum_multixact_freeze_max_age, but may be less if we are
1979  * short of multixact member space.
1980  */
1981  effective_multixact_freeze_max_age = MultiXactMemberFreezeThreshold();
1982 
1983  /*
1984  * Find the pg_database entry and select the default freeze ages. We use
1985  * zero in template and nonconnectable databases, else the system-wide
1986  * default.
1987  */
1989  if (!HeapTupleIsValid(tuple))
1990  elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
1991  dbForm = (Form_pg_database) GETSTRUCT(tuple);
1992 
1993  if (dbForm->datistemplate || !dbForm->datallowconn)
1994  {
1999  }
2000  else
2001  {
2006  }
2007 
2008  ReleaseSysCache(tuple);
2009 
2010  /* StartTransactionCommand changed elsewhere */
2012 
2013  /* The database hash where pgstat keeps shared relations */
2015 
2017 
2018  /* create a copy so we can use it after closing pg_class */
2019  pg_class_desc = CreateTupleDescCopy(RelationGetDescr(classRel));
2020 
2021  /* create hash table for toast <-> main relid mapping */
2022  MemSet(&ctl, 0, sizeof(ctl));
2023  ctl.keysize = sizeof(Oid);
2024  ctl.entrysize = sizeof(av_relation);
2025 
2026  table_toast_map = hash_create("TOAST to main relid map",
2027  100,
2028  &ctl,
2029  HASH_ELEM | HASH_BLOBS);
2030 
2031  /*
2032  * Scan pg_class to determine which tables to vacuum.
2033  *
2034  * We do this in two passes: on the first one we collect the list of plain
2035  * relations and materialized views, and on the second one we collect
2036  * TOAST tables. The reason for doing the second pass is that during it we
2037  * want to use the main relation's pg_class.reloptions entry if the TOAST
2038  * table does not have any, and we cannot obtain it unless we know
2039  * beforehand what's the main table OID.
2040  *
2041  * We need to check TOAST tables separately because in cases with short,
2042  * wide tables there might be proportionally much more activity in the
2043  * TOAST table than in its parent.
2044  */
2045  relScan = heap_beginscan_catalog(classRel, 0, NULL);
2046 
2047  /*
2048  * On the first pass, we collect main tables to vacuum, and also the main
2049  * table relid to TOAST relid mapping.
2050  */
2051  while ((tuple = heap_getnext(relScan, ForwardScanDirection)) != NULL)
2052  {
2053  Form_pg_class classForm = (Form_pg_class) GETSTRUCT(tuple);
2054  PgStat_StatTabEntry *tabentry;
2055  AutoVacOpts *relopts;
2056  Oid relid;
2057  bool dovacuum;
2058  bool doanalyze;
2059  bool wraparound;
2060 
2061  if (classForm->relkind != RELKIND_RELATION &&
2062  classForm->relkind != RELKIND_MATVIEW)
2063  continue;
2064 
2065  relid = HeapTupleGetOid(tuple);
2066 
2067  /*
2068  * Check if it is a temp table (presumably, of some other backend's).
2069  * We cannot safely process other backends' temp tables.
2070  */
2071  if (classForm->relpersistence == RELPERSISTENCE_TEMP)
2072  {
2073  int backendID;
2074 
2075  backendID = GetTempNamespaceBackendId(classForm->relnamespace);
2076 
2077  /* We just ignore it if the owning backend is still active */
2078  if (backendID != InvalidBackendId &&
2079  (backendID == MyBackendId ||
2080  BackendIdGetProc(backendID) == NULL))
2081  {
2082  /*
2083  * The table seems to be orphaned -- although it might be that
2084  * the owning backend has already deleted it and exited; our
2085  * pg_class scan snapshot is not necessarily up-to-date
2086  * anymore, so we could be looking at a committed-dead entry.
2087  * Remember it so we can try to delete it later.
2088  */
2089  orphan_oids = lappend_oid(orphan_oids, relid);
2090  }
2091  continue;
2092  }
2093 
2094  /* Fetch reloptions and the pgstat entry for this table */
2095  relopts = extract_autovac_opts(tuple, pg_class_desc);
2096  tabentry = get_pgstat_tabentry_relid(relid, classForm->relisshared,
2097  shared, dbentry);
2098 
2099  /* Check if it needs vacuum or analyze */
2100  relation_needs_vacanalyze(relid, relopts, classForm, tabentry,
2101  effective_multixact_freeze_max_age,
2102  &dovacuum, &doanalyze, &wraparound);
2103 
2104  /* Relations that need work are added to table_oids */
2105  if (dovacuum || doanalyze)
2106  table_oids = lappend_oid(table_oids, relid);
2107 
2108  /*
2109  * Remember TOAST associations for the second pass. Note: we must do
2110  * this whether or not the table is going to be vacuumed, because we
2111  * don't automatically vacuum toast tables along the parent table.
2112  */
2113  if (OidIsValid(classForm->reltoastrelid))
2114  {
2115  av_relation *hentry;
2116  bool found;
2117 
2118  hentry = hash_search(table_toast_map,
2119  &classForm->reltoastrelid,
2120  HASH_ENTER, &found);
2121 
2122  if (!found)
2123  {
2124  /* hash_search already filled in the key */
2125  hentry->ar_relid = relid;
2126  hentry->ar_hasrelopts = false;
2127  if (relopts != NULL)
2128  {
2129  hentry->ar_hasrelopts = true;
2130  memcpy(&hentry->ar_reloptions, relopts,
2131  sizeof(AutoVacOpts));
2132  }
2133  }
2134  }
2135  }
2136 
2137  heap_endscan(relScan);
2138 
2139  /* second pass: check TOAST tables */
2140  ScanKeyInit(&key,
2142  BTEqualStrategyNumber, F_CHAREQ,
2144 
2145  relScan = heap_beginscan_catalog(classRel, 1, &key);
2146  while ((tuple = heap_getnext(relScan, ForwardScanDirection)) != NULL)
2147  {
2148  Form_pg_class classForm = (Form_pg_class) GETSTRUCT(tuple);
2149  PgStat_StatTabEntry *tabentry;
2150  Oid relid;
2151  AutoVacOpts *relopts = NULL;
2152  bool dovacuum;
2153  bool doanalyze;
2154  bool wraparound;
2155 
2156  /*
2157  * We cannot safely process other backends' temp tables, so skip 'em.
2158  */
2159  if (classForm->relpersistence == RELPERSISTENCE_TEMP)
2160  continue;
2161 
2162  relid = HeapTupleGetOid(tuple);
2163 
2164  /*
2165  * fetch reloptions -- if this toast table does not have them, try the
2166  * main rel
2167  */
2168  relopts = extract_autovac_opts(tuple, pg_class_desc);
2169  if (relopts == NULL)
2170  {
2171  av_relation *hentry;
2172  bool found;
2173 
2174  hentry = hash_search(table_toast_map, &relid, HASH_FIND, &found);
2175  if (found && hentry->ar_hasrelopts)
2176  relopts = &hentry->ar_reloptions;
2177  }
2178 
2179  /* Fetch the pgstat entry for this table */
2180  tabentry = get_pgstat_tabentry_relid(relid, classForm->relisshared,
2181  shared, dbentry);
2182 
2183  relation_needs_vacanalyze(relid, relopts, classForm, tabentry,
2184  effective_multixact_freeze_max_age,
2185  &dovacuum, &doanalyze, &wraparound);
2186 
2187  /* ignore analyze for toast tables */
2188  if (dovacuum)
2189  table_oids = lappend_oid(table_oids, relid);
2190  }
2191 
2192  heap_endscan(relScan);
2193  heap_close(classRel, AccessShareLock);
2194 
2195  /*
2196  * Recheck orphan temporary tables, and if they still seem orphaned, drop
2197  * them. We'll eat a transaction per dropped table, which might seem
2198  * excessive, but we should only need to do anything as a result of a
2199  * previous backend crash, so this should not happen often enough to
2200  * justify "optimizing". Using separate transactions ensures that we
2201  * don't bloat the lock table if there are many temp tables to be dropped,
2202  * and it ensures that we don't lose work if a deletion attempt fails.
2203  */
2204  foreach(cell, orphan_oids)
2205  {
2206  Oid relid = lfirst_oid(cell);
2207  Form_pg_class classForm;
2208  int backendID;
2209  ObjectAddress object;
2210 
2211  /*
2212  * Check for user-requested abort.
2213  */
2215 
2216  /*
2217  * Try to lock the table. If we can't get the lock immediately,
2218  * somebody else is using (or dropping) the table, so it's not our
2219  * concern anymore. Having the lock prevents race conditions below.
2220  */
2222  continue;
2223 
2224  /*
2225  * Re-fetch the pg_class tuple and re-check whether it still seems to
2226  * be an orphaned temp table. If it's not there or no longer the same
2227  * relation, ignore it.
2228  */
2229  tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
2230  if (!HeapTupleIsValid(tuple))
2231  {
2232  /* be sure to drop useless lock so we don't bloat lock table */
2234  continue;
2235  }
2236  classForm = (Form_pg_class) GETSTRUCT(tuple);
2237 
2238  /*
2239  * Make all the same tests made in the loop above. In event of OID
2240  * counter wraparound, the pg_class entry we have now might be
2241  * completely unrelated to the one we saw before.
2242  */
2243  if (!((classForm->relkind == RELKIND_RELATION ||
2244  classForm->relkind == RELKIND_MATVIEW) &&
2245  classForm->relpersistence == RELPERSISTENCE_TEMP))
2246  {
2248  continue;
2249  }
2250  backendID = GetTempNamespaceBackendId(classForm->relnamespace);
2251  if (!(backendID != InvalidBackendId &&
2252  (backendID == MyBackendId ||
2253  BackendIdGetProc(backendID) == NULL)))
2254  {
2256  continue;
2257  }
2258 
2259  /* OK, let's delete it */
2260  ereport(LOG,
2261  (errmsg("autovacuum: dropping orphan temp table \"%s.%s.%s\"",
2263  get_namespace_name(classForm->relnamespace),
2264  NameStr(classForm->relname))));
2265 
2266  object.classId = RelationRelationId;
2267  object.objectId = relid;
2268  object.objectSubId = 0;
2269  performDeletion(&object, DROP_CASCADE,
2273 
2274  /*
2275  * To commit the deletion, end current transaction and start a new
2276  * one. Note this also releases the lock we took.
2277  */
2280 
2281  /* StartTransactionCommand changed current memory context */
2283  }
2284 
2285  /*
2286  * Create a buffer access strategy object for VACUUM to use. We want to
2287  * use the same one across all the vacuum operations we perform, since the
2288  * point is for VACUUM not to blow out the shared cache.
2289  */
2290  bstrategy = GetAccessStrategy(BAS_VACUUM);
2291 
2292  /*
2293  * create a memory context to act as fake PortalContext, so that the
2294  * contexts created in the vacuum code are cleaned up for each table.
2295  */
2297  "Autovacuum Portal",
2299 
2300  /*
2301  * Perform operations on collected tables.
2302  */
2303  foreach(cell, table_oids)
2304  {
2305  Oid relid = lfirst_oid(cell);
2306  autovac_table *tab;
2307  bool skipit;
2308  int stdVacuumCostDelay;
2309  int stdVacuumCostLimit;
2310  dlist_iter iter;
2311 
2313 
2314  /*
2315  * Check for config changes before processing each collected table.
2316  */
2317  if (got_SIGHUP)
2318  {
2319  got_SIGHUP = false;
2321 
2322  /*
2323  * You might be tempted to bail out if we see autovacuum is now
2324  * disabled. Must resist that temptation -- this might be a
2325  * for-wraparound emergency worker, in which case that would be
2326  * entirely inappropriate.
2327  */
2328  }
2329 
2330  /*
2331  * hold schedule lock from here until we're sure that this table still
2332  * needs vacuuming. We also need the AutovacuumLock to walk the
2333  * worker array, but we'll let go of that one quickly.
2334  */
2335  LWLockAcquire(AutovacuumScheduleLock, LW_EXCLUSIVE);
2336  LWLockAcquire(AutovacuumLock, LW_SHARED);
2337 
2338  /*
2339  * Check whether the table is being vacuumed concurrently by another
2340  * worker.
2341  */
2342  skipit = false;
2344  {
2345  WorkerInfo worker = dlist_container(WorkerInfoData, wi_links, iter.cur);
2346 
2347  /* ignore myself */
2348  if (worker == MyWorkerInfo)
2349  continue;
2350 
2351  /* ignore workers in other databases (unless table is shared) */
2352  if (!worker->wi_sharedrel && worker->wi_dboid != MyDatabaseId)
2353  continue;
2354 
2355  if (worker->wi_tableoid == relid)
2356  {
2357  skipit = true;
2358  found_concurrent_worker = true;
2359  break;
2360  }
2361  }
2362  LWLockRelease(AutovacuumLock);
2363  if (skipit)
2364  {
2365  LWLockRelease(AutovacuumScheduleLock);
2366  continue;
2367  }
2368 
2369  /*
2370  * Check whether pgstat data still says we need to vacuum this table.
2371  * It could have changed if something else processed the table while
2372  * we weren't looking.
2373  *
2374  * Note: we have a special case in pgstat code to ensure that the
2375  * stats we read are as up-to-date as possible, to avoid the problem
2376  * that somebody just finished vacuuming this table. The window to
2377  * the race condition is not closed but it is very small.
2378  */
2380  tab = table_recheck_autovac(relid, table_toast_map, pg_class_desc,
2381  effective_multixact_freeze_max_age);
2382  if (tab == NULL)
2383  {
2384  /* someone else vacuumed the table, or it went away */
2385  LWLockRelease(AutovacuumScheduleLock);
2386  continue;
2387  }
2388 
2389  /*
2390  * Ok, good to go. Store the table in shared memory before releasing
2391  * the lock so that other workers don't vacuum it concurrently.
2392  */
2393  MyWorkerInfo->wi_tableoid = relid;
2395  LWLockRelease(AutovacuumScheduleLock);
2396 
2397  /*
2398  * Remember the prevailing values of the vacuum cost GUCs. We have to
2399  * restore these at the bottom of the loop, else we'll compute wrong
2400  * values in the next iteration of autovac_balance_cost().
2401  */
2402  stdVacuumCostDelay = VacuumCostDelay;
2403  stdVacuumCostLimit = VacuumCostLimit;
2404 
2405  /* Must hold AutovacuumLock while mucking with cost balance info */
2406  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
2407 
2408  /* advertise my cost delay parameters for the balancing algorithm */
2413 
2414  /* do a balance */
2416 
2417  /* set the active cost parameters from the result of that */
2419 
2420  /* done */
2421  LWLockRelease(AutovacuumLock);
2422 
2423  /* clean up memory before each iteration */
2425 
2426  /*
2427  * Save the relation name for a possible error message, to avoid a
2428  * catalog lookup in case of an error. If any of these return NULL,
2429  * then the relation has been dropped since last we checked; skip it.
2430  * Note: they must live in a long-lived memory context because we call
2431  * vacuum and analyze in different transactions.
2432  */
2433 
2434  tab->at_relname = get_rel_name(tab->at_relid);
2437  if (!tab->at_relname || !tab->at_nspname || !tab->at_datname)
2438  goto deleted;
2439 
2440  /*
2441  * We will abort vacuuming the current table if something errors out,
2442  * and continue with the next one in schedule; in particular, this
2443  * happens if we are interrupted with SIGINT.
2444  */
2445  PG_TRY();
2446  {
2447  /* have at it */
2449  autovacuum_do_vac_analyze(tab, bstrategy);
2450 
2451  /*
2452  * Clear a possible query-cancel signal, to avoid a late reaction
2453  * to an automatically-sent signal because of vacuuming the
2454  * current table (we're done with it, so it would make no sense to
2455  * cancel at this point.)
2456  */
2457  QueryCancelPending = false;
2458  }
2459  PG_CATCH();
2460  {
2461  /*
2462  * Abort the transaction, start a new one, and proceed with the
2463  * next table in our list.
2464  */
2465  HOLD_INTERRUPTS();
2466  if (tab->at_vacoptions & VACOPT_VACUUM)
2467  errcontext("automatic vacuum of table \"%s.%s.%s\"",
2468  tab->at_datname, tab->at_nspname, tab->at_relname);
2469  else
2470  errcontext("automatic analyze of table \"%s.%s.%s\"",
2471  tab->at_datname, tab->at_nspname, tab->at_relname);
2472  EmitErrorReport();
2473 
2474  /* this resets the PGXACT flags too */
2476  FlushErrorState();
2478 
2479  /* restart our transaction for the following operations */
2482  }
2483  PG_END_TRY();
2484 
2485  did_vacuum = true;
2486 
2487  /* the PGXACT flags are reset at the next end of transaction */
2488 
2489  /* be tidy */
2490 deleted:
2491  if (tab->at_datname != NULL)
2492  pfree(tab->at_datname);
2493  if (tab->at_nspname != NULL)
2494  pfree(tab->at_nspname);
2495  if (tab->at_relname != NULL)
2496  pfree(tab->at_relname);
2497  pfree(tab);
2498 
2499  /*
2500  * Remove my info from shared memory. We could, but intentionally
2501  * don't, clear wi_cost_limit and friends --- this is on the
2502  * assumption that we probably have more to do with similar cost
2503  * settings, so we don't want to give up our share of I/O for a very
2504  * short interval and thereby thrash the global balance.
2505  */
2506  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
2508  MyWorkerInfo->wi_sharedrel = false;
2509  LWLockRelease(AutovacuumLock);
2510 
2511  /* restore vacuum cost GUCs for the next iteration */
2512  VacuumCostDelay = stdVacuumCostDelay;
2513  VacuumCostLimit = stdVacuumCostLimit;
2514  }
2515 
2516  /*
2517  * Perform additional work items, as requested by backends.
2518  */
2519  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
2520  for (i = 0; i < NUM_WORKITEMS; i++)
2521  {
2523 
2524  if (!workitem->avw_used)
2525  continue;
2526  if (workitem->avw_active)
2527  continue;
2528 
2529  /* claim this one, and release lock while performing it */
2530  workitem->avw_active = true;
2531  LWLockRelease(AutovacuumLock);
2532 
2533  perform_work_item(workitem);
2534 
2535  /*
2536  * Check for config changes before acquiring lock for further
2537  * jobs.
2538  */
2540  if (got_SIGHUP)
2541  {
2542  got_SIGHUP = false;
2544  }
2545 
2546  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
2547 
2548  /* and mark it done */
2549  workitem->avw_active = false;
2550  workitem->avw_used = false;
2551  }
2552  LWLockRelease(AutovacuumLock);
2553 
2554  /*
2555  * We leak table_toast_map here (among other things), but since we're
2556  * going away soon, it's not a problem.
2557  */
2558 
2559  /*
2560  * Update pg_database.datfrozenxid, and truncate pg_xact if possible. We
2561  * only need to do this once, not after each table.
2562  *
2563  * Even if we didn't vacuum anything, it may still be important to do
2564  * this, because one indirect effect of vac_update_datfrozenxid() is to
2565  * update ShmemVariableCache->xidVacLimit. That might need to be done
2566  * even if we haven't vacuumed anything, because relations with older
2567  * relfrozenxid values or other databases with older datfrozenxid values
2568  * might have been dropped, allowing xidVacLimit to advance.
2569  *
2570  * However, it's also important not to do this blindly in all cases,
2571  * because when autovacuum=off this will restart the autovacuum launcher.
2572  * If we're not careful, an infinite loop can result, where workers find
2573  * no work to do and restart the launcher, which starts another worker in
2574  * the same database that finds no work to do. To prevent that, we skip
2575  * this if (1) we found no work to do and (2) we skipped at least one
2576  * table due to concurrent autovacuum activity. In that case, the other
2577  * worker has already done it, or will do so when it finishes.
2578  */
2579  if (did_vacuum || !found_concurrent_worker)
2581 
2582  /* Finally close out the last transaction. */
2584 }
BufferAccessStrategy GetAccessStrategy(BufferAccessStrategyType btype)
Definition: freelist.c:525
#define NIL
Definition: pg_list.h:69
bool ConditionalLockRelationOid(Oid relid, LOCKMODE lockmode)
Definition: lmgr.c:138
static int default_freeze_table_age
Definition: autovacuum.c:151
TupleDesc CreateTupleDescCopy(TupleDesc tupdesc)
Definition: tupdesc.c:141
BackendId MyBackendId
Definition: globals.c:73
#define NUM_WORKITEMS
Definition: autovacuum.c:264
#define GETSTRUCT(TUP)
Definition: htup_details.h:656
static void autovac_balance_cost(void)
Definition: autovacuum.c:1775
MemoryContext TopTransactionContext
Definition: mcxt.c:48
int vacuum_multixact_freeze_table_age
Definition: vacuum.c:61
void heap_endscan(HeapScanDesc scan)
Definition: heapam.c:1580
int at_vacuum_cost_delay
Definition: autovacuum.c:193
#define HASH_ELEM
Definition: hsearch.h:87
void ProcessConfigFile(GucContext context)
void vac_update_datfrozenxid(void)
Definition: vacuum.c:922
static int default_multixact_freeze_min_age
Definition: autovacuum.c:152
#define RelationGetDescr(relation)
Definition: rel.h:428
void UnlockRelationOid(Oid relid, LOCKMODE lockmode)
Definition: lmgr.c:182
FormData_pg_database * Form_pg_database
Definition: pg_database.h:57
#define dlist_foreach(iter, lhead)
Definition: ilist.h:507
void CommitTransactionCommand(void)
Definition: xact.c:2750
#define RelationRelationId
Definition: pg_class.h:29
static MemoryContext AutovacMemCxt
Definition: autovacuum.c:156
Oid get_rel_namespace(Oid relid)
Definition: lsyscache.c:1750
#define RELKIND_MATVIEW
Definition: pg_class.h:165
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
#define AccessShareLock
Definition: lockdefs.h:36
Size entrysize
Definition: hsearch.h:73
#define MemSet(start, val, len)
Definition: c.h:858
static volatile sig_atomic_t got_SIGHUP
Definition: autovacuum.c:141
PgStat_StatDBEntry * pgstat_fetch_stat_dbentry(Oid dbid)
Definition: pgstat.c:2387
int GetTempNamespaceBackendId(Oid namespaceId)
Definition: namespace.c:3195
#define heap_close(r, l)
Definition: heapam.h:97
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:902
char * at_datname
Definition: autovacuum.c:199
#define LOG
Definition: elog.h:26
unsigned int Oid
Definition: postgres_ext.h:31
volatile bool QueryCancelPending
Definition: globals.c:30
List * lappend_oid(List *list, Oid datum)
Definition: list.c:164
#define OidIsValid(objectId)
Definition: c.h:538
void AbortOutOfAnyTransaction(void)
Definition: xact.c:4225
void FlushErrorState(void)
Definition: elog.c:1587
#define SearchSysCache1(cacheId, key1)
Definition: syscache.h:156
MemoryContext PortalContext
Definition: mcxt.c:52
bool at_sharedrel
Definition: autovacuum.c:196
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1715
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:117
#define Anum_pg_class_relkind
Definition: pg_class.h:118
int at_vacuum_cost_limit
Definition: autovacuum.c:194
Definition: dynahash.c:208
char * at_relname
Definition: autovacuum.c:197
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
void pfree(void *pointer)
Definition: mcxt.c:950
#define ObjectIdGetDatum(X)
Definition: postgres.h:513
#define ERROR
Definition: elog.h:43
int VacuumCostLimit
Definition: globals.c:132
int vacuum_multixact_freeze_min_age
Definition: vacuum.c:60
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:165
char * get_database_name(Oid dbid)
Definition: dbcommands.c:2056
AutoVacuumWorkItem av_workItems[NUM_WORKITEMS]
Definition: autovacuum.c:289
char * get_namespace_name(Oid nspid)
Definition: lsyscache.c:3033
static AutoVacOpts * extract_autovac_opts(HeapTuple tup, TupleDesc pg_class_desc)
Definition: autovacuum.c:2690
void performDeletion(const ObjectAddress *object, DropBehavior behavior, int flags)
Definition: dependency.c:303
static PgStat_StatTabEntry * get_pgstat_tabentry_relid(Oid relid, bool isshared, PgStat_StatDBEntry *shared, PgStat_StatDBEntry *dbentry)
Definition: autovacuum.c:2716
static void perform_work_item(AutoVacuumWorkItem *workitem)
Definition: autovacuum.c:2590
static WorkerInfo MyWorkerInfo
Definition: autovacuum.c:302
HeapScanDesc heap_beginscan_catalog(Relation relation, int nkeys, ScanKey key)
Definition: heapam.c:1405
static void relation_needs_vacanalyze(Oid relid, AutoVacOpts *relopts, Form_pg_class classForm, PgStat_StatTabEntry *tabentry, int effective_multixact_freeze_max_age, bool *dovacuum, bool *doanalyze, bool *wraparound)
Definition: autovacuum.c:2925
#define ereport(elevel, rest)
Definition: elog.h:122
void pgstat_vacuum_stat(void)
Definition: pgstat.c:1022
int MultiXactMemberFreezeThreshold(void)
Definition: multixact.c:2817
int wi_cost_limit_base
Definition: autovacuum.c:231
MemoryContext TopMemoryContext
Definition: mcxt.c:43
Definition: guc.h:72
#define MemoryContextResetAndDeleteChildren(ctx)
Definition: memutils.h:67
#define HASH_BLOBS
Definition: hsearch.h:88
char * at_nspname
Definition: autovacuum.c:198
#define InvalidBackendId
Definition: backendid.h:23
MemoryContext AllocSetContextCreate(MemoryContext parent, const char *name, Size minContextSize, Size initBlockSize, Size maxBlockSize)
Definition: aset.c:322
#define RELKIND_TOASTVALUE
Definition: pg_class.h:163
HTAB * hash_create(const char *tabname, long nelem, HASHCTL *info, int flags)
Definition: dynahash.c:316
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1117
Oid MyDatabaseId
Definition: globals.c:77
HeapTuple heap_getnext(HeapScanDesc scan, ScanDirection direction)
Definition: heapam.c:1810
Relation heap_open(Oid relationId, LOCKMODE lockmode)
Definition: heapam.c:1290
Size keysize
Definition: hsearch.h:72
dlist_node * cur
Definition: ilist.h:161
void EmitErrorReport(void)
Definition: elog.c:1446
#define InvalidOid
Definition: postgres_ext.h:36
int VacuumCostDelay
Definition: globals.c:133
#define PG_CATCH()
Definition: elog.h:293
#define HeapTupleIsValid(tuple)
Definition: htup.h:77
#define NULL
Definition: c.h:229
#define PERFORM_DELETION_QUIETLY
Definition: dependency.h:176
void StartTransactionCommand(void)
Definition: xact.c:2680
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1111
int vacuum_freeze_min_age
Definition: vacuum.c:58
int vacuum_freeze_table_age
Definition: vacuum.c:59
#define CharGetDatum(X)
Definition: postgres.h:422
FormData_pg_class * Form_pg_class
Definition: pg_class.h:95
#define SearchSysCacheCopy1(cacheId, key1)
Definition: syscache.h:165
AutoVacOpts ar_reloptions
Definition: autovacuum.c:183
#define AccessExclusiveLock
Definition: lockdefs.h:45
static void autovacuum_do_vac_analyze(autovac_table *tab, BufferAccessStrategy bstrategy)
Definition: autovacuum.c:3070
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:115
int i
#define errcontext
Definition: elog.h:164
#define NameStr(name)
Definition: c.h:499
struct av_relation av_relation
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
void AutoVacuumUpdateDelay(void)
Definition: autovacuum.c:1759
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:98
#define elog
Definition: elog.h:219
#define HeapTupleGetOid(tuple)
Definition: htup_details.h:695
#define RELPERSISTENCE_TEMP
Definition: pg_class.h:172
dlist_head av_runningWorkers
Definition: autovacuum.c:287
#define PG_TRY()
Definition: elog.h:284
#define PERFORM_DELETION_SKIP_EXTENSIONS
Definition: dependency.h:178
#define RELKIND_RELATION
Definition: pg_class.h:160
bool ar_hasrelopts
Definition: autovacuum.c:182
Definition: pg_list.h:45
char * get_rel_name(Oid relid)
Definition: lsyscache.c:1726
static int default_multixact_freeze_table_age
Definition: autovacuum.c:153
static int default_freeze_min_age
Definition: autovacuum.c:150
#define PG_END_TRY()
Definition: elog.h:300
#define BTEqualStrategyNumber
Definition: stratnum.h:31
bool at_dobalance
Definition: autovacuum.c:195
#define lfirst_oid(lc)
Definition: pg_list.h:108
static autovac_table * table_recheck_autovac(Oid relid, HTAB *table_toast_map, TupleDesc pg_class_desc, int effective_multixact_freeze_max_age)
Definition: autovacuum.c:2743
#define PERFORM_DELETION_INTERNAL
Definition: dependency.h:174
PGPROC * BackendIdGetProc(int backendID)
Definition: sinvaladt.c:377
static Oid do_start_worker ( void  )
static

Definition at line 1125 of file autovacuum.c.

References avl_dbase::adl_datid, avl_dbase::adl_next_worker, avw_dbase::adw_datid, avw_dbase::adw_entry, avw_dbase::adw_frozenxid, avw_dbase::adw_minmulti, ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate(), autovac_refresh_stats(), autovacuum_freeze_max_age, autovacuum_naptime, AutoVacuumShmemStruct::av_freeWorkers, AutoVacuumShmemStruct::av_startingWorker, dlist_iter::cur, CurrentMemoryContext, dblist, dlist_container, dlist_is_empty(), dlist_pop_head_node(), dlist_reverse_foreach, FirstMultiXactId, FirstNormalTransactionId, get_database_list(), GetCurrentTimestamp(), InvalidOid, PgStat_StatDBEntry::last_autovac_time, lfirst, LW_EXCLUSIVE, LW_SHARED, LWLockAcquire(), LWLockRelease(), MemoryContextDelete(), MemoryContextSwitchTo(), MultiXactIdPrecedes(), MultiXactMemberFreezeThreshold(), NULL, pgstat_fetch_stat_dbentry(), PMSIGNAL_START_AUTOVAC_WORKER, ReadNewTransactionId(), ReadNextMultiXactId(), rebuild_database_list(), recentMulti, recentXid, SendPostmasterSignal(), TimestampDifferenceExceeds(), TransactionIdPrecedes(), WorkerInfoData::wi_dboid, WorkerInfoData::wi_launchtime, and WorkerInfoData::wi_proc.

Referenced by AutoVacLauncherMain(), and launch_worker().

1126 {
1127  List *dblist;
1128  ListCell *cell;
1129  TransactionId xidForceLimit;
1130  MultiXactId multiForceLimit;
1131  bool for_xid_wrap;
1132  bool for_multi_wrap;
1133  avw_dbase *avdb;
1134  TimestampTz current_time;
1135  bool skipit = false;
1136  Oid retval = InvalidOid;
1137  MemoryContext tmpcxt,
1138  oldcxt;
1139 
1140  /* return quickly when there are no free workers */
1141  LWLockAcquire(AutovacuumLock, LW_SHARED);
1143  {
1144  LWLockRelease(AutovacuumLock);
1145  return InvalidOid;
1146  }
1147  LWLockRelease(AutovacuumLock);
1148 
1149  /*
1150  * Create and switch to a temporary context to avoid leaking the memory
1151  * allocated for the database list.
1152  */
1154  "Start worker tmp cxt",
1156  oldcxt = MemoryContextSwitchTo(tmpcxt);
1157 
1158  /* use fresh stats */
1160 
1161  /* Get a list of databases */
1162  dblist = get_database_list();
1163 
1164  /*
1165  * Determine the oldest datfrozenxid/relfrozenxid that we will allow to
1166  * pass without forcing a vacuum. (This limit can be tightened for
1167  * particular tables, but not loosened.)
1168  */
1170  xidForceLimit = recentXid - autovacuum_freeze_max_age;
1171  /* ensure it's a "normal" XID, else TransactionIdPrecedes misbehaves */
1172  /* this can cause the limit to go backwards by 3, but that's OK */
1173  if (xidForceLimit < FirstNormalTransactionId)
1174  xidForceLimit -= FirstNormalTransactionId;
1175 
1176  /* Also determine the oldest datminmxid we will consider. */
1178  multiForceLimit = recentMulti - MultiXactMemberFreezeThreshold();
1179  if (multiForceLimit < FirstMultiXactId)
1180  multiForceLimit -= FirstMultiXactId;
1181 
1182  /*
1183  * Choose a database to connect to. We pick the database that was least
1184  * recently auto-vacuumed, or one that needs vacuuming to prevent Xid
1185  * wraparound-related data loss. If any db at risk of Xid wraparound is
1186  * found, we pick the one with oldest datfrozenxid, independently of
1187  * autovacuum times; similarly we pick the one with the oldest datminmxid
1188  * if any is in MultiXactId wraparound. Note that those in Xid wraparound
1189  * danger are given more priority than those in multi wraparound danger.
1190  *
1191  * Note that a database with no stats entry is not considered, except for
1192  * Xid wraparound purposes. The theory is that if no one has ever
1193  * connected to it since the stats were last initialized, it doesn't need
1194  * vacuuming.
1195  *
1196  * XXX This could be improved if we had more info about whether it needs
1197  * vacuuming before connecting to it. Perhaps look through the pgstats
1198  * data for the database's tables? One idea is to keep track of the
1199  * number of new and dead tuples per database in pgstats. However it
1200  * isn't clear how to construct a metric that measures that and not cause
1201  * starvation for less busy databases.
1202  */
1203  avdb = NULL;
1204  for_xid_wrap = false;
1205  for_multi_wrap = false;
1206  current_time = GetCurrentTimestamp();
1207  foreach(cell, dblist)
1208  {
1209  avw_dbase *tmp = lfirst(cell);
1210  dlist_iter iter;
1211 
1212  /* Check to see if this one is at risk of wraparound */
1213  if (TransactionIdPrecedes(tmp->adw_frozenxid, xidForceLimit))
1214  {
1215  if (avdb == NULL ||
1217  avdb->adw_frozenxid))
1218  avdb = tmp;
1219  for_xid_wrap = true;
1220  continue;
1221  }
1222  else if (for_xid_wrap)
1223  continue; /* ignore not-at-risk DBs */
1224  else if (MultiXactIdPrecedes(tmp->adw_minmulti, multiForceLimit))
1225  {
1226  if (avdb == NULL ||
1228  avdb = tmp;
1229  for_multi_wrap = true;
1230  continue;
1231  }
1232  else if (for_multi_wrap)
1233  continue; /* ignore not-at-risk DBs */
1234 
1235  /* Find pgstat entry if any */
1237 
1238  /*
1239  * Skip a database with no pgstat entry; it means it hasn't seen any
1240  * activity.
1241  */
1242  if (!tmp->adw_entry)
1243  continue;
1244 
1245  /*
1246  * Also, skip a database that appears on the database list as having
1247  * been processed recently (less than autovacuum_naptime seconds ago).
1248  * We do this so that we don't select a database which we just
1249  * selected, but that pgstat hasn't gotten around to updating the last
1250  * autovacuum time yet.
1251  */
1252  skipit = false;
1253 
1255  {
1256  avl_dbase *dbp = dlist_container(avl_dbase, adl_node, iter.cur);
1257 
1258  if (dbp->adl_datid == tmp->adw_datid)
1259  {
1260  /*
1261  * Skip this database if its next_worker value falls between
1262  * the current time and the current time plus naptime.
1263  */
1265  current_time, 0) &&
1266  !TimestampDifferenceExceeds(current_time,
1267  dbp->adl_next_worker,
1268  autovacuum_naptime * 1000))
1269  skipit = true;
1270 
1271  break;
1272  }
1273  }
1274  if (skipit)
1275  continue;
1276 
1277  /*
1278  * Remember the db with oldest autovac time. (If we are here, both
1279  * tmp->entry and db->entry must be non-null.)
1280  */
1281  if (avdb == NULL ||
1283  avdb = tmp;
1284  }
1285 
1286  /* Found a database -- process it */
1287  if (avdb != NULL)
1288  {
1289  WorkerInfo worker;
1290  dlist_node *wptr;
1291 
1292  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
1293 
1294  /*
1295  * Get a worker entry from the freelist. We checked above, so there
1296  * really should be a free slot.
1297  */
1299 
1300  worker = dlist_container(WorkerInfoData, wi_links, wptr);
1301  worker->wi_dboid = avdb->adw_datid;
1302  worker->wi_proc = NULL;
1303  worker->wi_launchtime = GetCurrentTimestamp();
1304 
1306 
1307  LWLockRelease(AutovacuumLock);
1308 
1310 
1311  retval = avdb->adw_datid;
1312  }
1313  else if (skipit)
1314  {
1315  /*
1316  * If we skipped all databases on the list, rebuild it, because it
1317  * probably contains a dropped database.
1318  */
1320  }
1321 
1322  MemoryContextSwitchTo(oldcxt);
1323  MemoryContextDelete(tmpcxt);
1324 
1325  return retval;
1326 }
int autovacuum_naptime
Definition: autovacuum.c:116
TimestampTz adl_next_worker
Definition: autovacuum.c:162
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:200
MultiXactId adw_minmulti
Definition: autovacuum.c:173
WorkerInfo av_startingWorker
Definition: autovacuum.c:288
dlist_head av_freeWorkers
Definition: autovacuum.c:286
uint32 TransactionId
Definition: c.h:397
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1570
int64 TimestampTz
Definition: timestamp.h:39
TimestampTz wi_launchtime
Definition: autovacuum.c:226
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
static MultiXactId recentMulti
Definition: autovacuum.c:147
static void autovac_refresh_stats(void)
Definition: autovacuum.c:3322
PgStat_StatDBEntry * pgstat_fetch_stat_dbentry(Oid dbid)
Definition: pgstat.c:2387
unsigned int Oid
Definition: postgres_ext.h:31
bool TimestampDifferenceExceeds(TimestampTz start_time, TimestampTz stop_time, int msec)
Definition: timestamp.c:1649
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1715
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
#define FirstNormalTransactionId
Definition: transam.h:34
int autovacuum_freeze_max_age
Definition: autovacuum.c:121
static List * get_database_list(void)
Definition: autovacuum.c:1863
Oid adl_datid
Definition: autovacuum.c:161
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:165
_stringlist * dblist
Definition: pg_regress.c:72
TimestampTz last_autovac_time
Definition: pgstat.h:587
TransactionId ReadNewTransactionId(void)
Definition: varsup.c:250
#define FirstMultiXactId
Definition: multixact.h:24
MemoryContext CurrentMemoryContext
Definition: mcxt.c:37
static dlist_head DatabaseList
Definition: autovacuum.c:298
int MultiXactMemberFreezeThreshold(void)
Definition: multixact.c:2817
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:300
TransactionId adw_frozenxid
Definition: autovacuum.c:172
MemoryContext AllocSetContextCreate(MemoryContext parent, const char *name, Size minContextSize, Size initBlockSize, Size maxBlockSize)
Definition: aset.c:322
PgStat_StatDBEntry * adw_entry
Definition: autovacuum.c:174
Oid adw_datid
Definition: autovacuum.c:170
static TransactionId recentXid
Definition: autovacuum.c:146
dlist_node * cur
Definition: ilist.h:161
#define InvalidOid
Definition: postgres_ext.h:36
TransactionId MultiXactId
Definition: c.h:407
#define NULL
Definition: c.h:229
#define lfirst(lc)
Definition: pg_list.h:106
static bool dlist_is_empty(dlist_head *head)
Definition: ilist.h:289
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1111
bool MultiXactIdPrecedes(MultiXactId multi1, MultiXactId multi2)
Definition: multixact.c:3140
static void rebuild_database_list(Oid newdb)
Definition: autovacuum.c:924
static dlist_node * dlist_pop_head_node(dlist_head *head)
Definition: ilist.h:368
PGPROC * wi_proc
Definition: autovacuum.c:225
void SendPostmasterSignal(PMSignalReason reason)
Definition: pmsignal.c:113
Definition: pg_list.h:45
#define dlist_reverse_foreach(iter, lhead)
Definition: ilist.h:538
MultiXactId ReadNextMultiXactId(void)
Definition: multixact.c:721
static AutoVacOpts * extract_autovac_opts ( HeapTuple  tup,
TupleDesc  pg_class_desc 
)
static

Definition at line 2690 of file autovacuum.c.

References Assert, av, extractRelOptions(), GETSTRUCT, NULL, palloc(), pfree(), RELKIND_MATVIEW, RELKIND_RELATION, and RELKIND_TOASTVALUE.

Referenced by do_autovacuum(), and table_recheck_autovac().

2691 {
2692  bytea *relopts;
2693  AutoVacOpts *av;
2694 
2695  Assert(((Form_pg_class) GETSTRUCT(tup))->relkind == RELKIND_RELATION ||
2696  ((Form_pg_class) GETSTRUCT(tup))->relkind == RELKIND_MATVIEW ||
2697  ((Form_pg_class) GETSTRUCT(tup))->relkind == RELKIND_TOASTVALUE);
2698 
2699  relopts = extractRelOptions(tup, pg_class_desc, NULL);
2700  if (relopts == NULL)
2701  return NULL;
2702 
2703  av = palloc(sizeof(AutoVacOpts));
2704  memcpy(av, &(((StdRdOptions *) relopts)->autovacuum), sizeof(AutoVacOpts));
2705  pfree(relopts);
2706 
2707  return av;
2708 }
#define GETSTRUCT(TUP)
Definition: htup_details.h:656
#define RELKIND_MATVIEW
Definition: pg_class.h:165
void pfree(void *pointer)
Definition: mcxt.c:950
struct @18::@19 av[32]
#define RELKIND_TOASTVALUE
Definition: pg_class.h:163
bytea * extractRelOptions(HeapTuple tuple, TupleDesc tupdesc, amoptions_function amoptions)
Definition: reloptions.c:956
#define NULL
Definition: c.h:229
#define Assert(condition)
Definition: c.h:676
FormData_pg_class * Form_pg_class
Definition: pg_class.h:95
void * palloc(Size size)
Definition: mcxt.c:849
Definition: c.h:439
#define RELKIND_RELATION
Definition: pg_class.h:160
static void FreeWorkerInfo ( int  code,
Datum  arg 
)
static

Definition at line 1710 of file autovacuum.c.

References AutoVacRebalance, AutovacuumLauncherPid, AutoVacuumShmemStruct::av_freeWorkers, AutoVacuumShmemStruct::av_launcherpid, AutoVacuumShmemStruct::av_signal, dlist_delete(), dlist_push_head(), InvalidOid, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), NULL, WorkerInfoData::wi_cost_delay, WorkerInfoData::wi_cost_limit, WorkerInfoData::wi_cost_limit_base, WorkerInfoData::wi_dboid, WorkerInfoData::wi_dobalance, WorkerInfoData::wi_launchtime, WorkerInfoData::wi_links, WorkerInfoData::wi_proc, WorkerInfoData::wi_sharedrel, and WorkerInfoData::wi_tableoid.

Referenced by AutoVacWorkerMain().

1711 {
1712  if (MyWorkerInfo != NULL)
1713  {
1714  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
1715 
1716  /*
1717  * Wake the launcher up so that he can launch a new worker immediately
1718  * if required. We only save the launcher's PID in local memory here;
1719  * the actual signal will be sent when the PGPROC is recycled. Note
1720  * that we always do this, so that the launcher can rebalance the cost
1721  * limit setting of the remaining workers.
1722  *
1723  * We somewhat ignore the risk that the launcher changes its PID
1724  * between us reading it and the actual kill; we expect ProcKill to be
1725  * called shortly after us, and we assume that PIDs are not reused too
1726  * quickly after a process exits.
1727  */
1729 
1733  MyWorkerInfo->wi_sharedrel = false;
1736  MyWorkerInfo->wi_dobalance = false;
1742  /* not mine anymore */
1743  MyWorkerInfo = NULL;
1744 
1745  /*
1746  * now that we're inactive, cause a rebalancing of the surviving
1747  * workers
1748  */
1750  LWLockRelease(AutovacuumLock);
1751  }
1752 }
sig_atomic_t av_signal[AutoVacNumSignals]
Definition: autovacuum.c:284
dlist_head av_freeWorkers
Definition: autovacuum.c:286
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
TimestampTz wi_launchtime
Definition: autovacuum.c:226
dlist_node wi_links
Definition: autovacuum.c:222
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1715
int AutovacuumLauncherPid
Definition: autovacuum.c:305
static WorkerInfo MyWorkerInfo
Definition: autovacuum.c:302
static void dlist_delete(dlist_node *node)
Definition: ilist.h:358
int wi_cost_limit_base
Definition: autovacuum.c:231
#define InvalidOid
Definition: postgres_ext.h:36
#define NULL
Definition: c.h:229
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1111
PGPROC * wi_proc
Definition: autovacuum.c:225
static List * get_database_list ( void  )
static

Definition at line 1863 of file autovacuum.c.

References AccessShareLock, avw_dbase::adw_datid, avw_dbase::adw_entry, avw_dbase::adw_frozenxid, avw_dbase::adw_minmulti, avw_dbase::adw_name, CommitTransactionCommand(), CurrentMemoryContext, DatabaseRelationId, dblist, ForwardScanDirection, GETSTRUCT, GetTransactionSnapshot(), heap_beginscan_catalog(), heap_close, heap_endscan(), heap_getnext(), heap_open(), HeapTupleGetOid, HeapTupleIsValid, lappend(), MemoryContextSwitchTo(), NameStr, NIL, NULL, palloc(), pstrdup(), and StartTransactionCommand().

Referenced by do_start_worker(), and rebuild_database_list().

1864 {
1865  List *dblist = NIL;
1866  Relation rel;
1867  HeapScanDesc scan;
1868  HeapTuple tup;
1869  MemoryContext resultcxt;
1870 
1871  /* This is the context that we will allocate our output data in */
1872  resultcxt = CurrentMemoryContext;
1873 
1874  /*
1875  * Start a transaction so we can access pg_database, and get a snapshot.
1876  * We don't have a use for the snapshot itself, but we're interested in
1877  * the secondary effect that it sets RecentGlobalXmin. (This is critical
1878  * for anything that reads heap pages, because HOT may decide to prune
1879  * them even if the process doesn't attempt to modify any tuples.)
1880  */
1882  (void) GetTransactionSnapshot();
1883 
1885  scan = heap_beginscan_catalog(rel, 0, NULL);
1886 
1887  while (HeapTupleIsValid(tup = heap_getnext(scan, ForwardScanDirection)))
1888  {
1889  Form_pg_database pgdatabase = (Form_pg_database) GETSTRUCT(tup);
1890  avw_dbase *avdb;
1891  MemoryContext oldcxt;
1892 
1893  /*
1894  * Allocate our results in the caller's context, not the
1895  * transaction's. We do this inside the loop, and restore the original
1896  * context at the end, so that leaky things like heap_getnext() are
1897  * not called in a potentially long-lived context.
1898  */
1899  oldcxt = MemoryContextSwitchTo(resultcxt);
1900 
1901  avdb = (avw_dbase *) palloc(sizeof(avw_dbase));
1902 
1903  avdb->adw_datid = HeapTupleGetOid(tup);
1904  avdb->adw_name = pstrdup(NameStr(pgdatabase->datname));
1905  avdb->adw_frozenxid = pgdatabase->datfrozenxid;
1906  avdb->adw_minmulti = pgdatabase->datminmxid;
1907  /* this gets set later: */
1908  avdb->adw_entry = NULL;
1909 
1910  dblist = lappend(dblist, avdb);
1911  MemoryContextSwitchTo(oldcxt);
1912  }
1913 
1914  heap_endscan(scan);
1916 
1918 
1919  return dblist;
1920 }
#define NIL
Definition: pg_list.h:69
MultiXactId adw_minmulti
Definition: autovacuum.c:173
#define GETSTRUCT(TUP)
Definition: htup_details.h:656
void heap_endscan(HeapScanDesc scan)
Definition: heapam.c:1580
FormData_pg_database * Form_pg_database
Definition: pg_database.h:57
char * pstrdup(const char *in)
Definition: mcxt.c:1077
#define DatabaseRelationId
Definition: pg_database.h:29
void CommitTransactionCommand(void)
Definition: xact.c:2750
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
#define AccessShareLock
Definition: lockdefs.h:36
#define heap_close(r, l)
Definition: heapam.h:97
Snapshot GetTransactionSnapshot(void)
Definition: snapmgr.c:304
_stringlist * dblist
Definition: pg_regress.c:72
MemoryContext CurrentMemoryContext
Definition: mcxt.c:37
HeapScanDesc heap_beginscan_catalog(Relation relation, int nkeys, ScanKey key)
Definition: heapam.c:1405
char * adw_name
Definition: autovacuum.c:171
List * lappend(List *list, void *datum)
Definition: list.c:128
TransactionId adw_frozenxid
Definition: autovacuum.c:172
PgStat_StatDBEntry * adw_entry
Definition: autovacuum.c:174
Oid adw_datid
Definition: autovacuum.c:170
HeapTuple heap_getnext(HeapScanDesc scan, ScanDirection direction)
Definition: heapam.c:1810
Relation heap_open(Oid relationId, LOCKMODE lockmode)
Definition: heapam.c:1290
#define HeapTupleIsValid(tuple)
Definition: htup.h:77
#define NULL
Definition: c.h:229
void StartTransactionCommand(void)
Definition: xact.c:2680
void * palloc(Size size)
Definition: mcxt.c:849
#define NameStr(name)
Definition: c.h:499
#define HeapTupleGetOid(tuple)
Definition: htup_details.h:695
Definition: pg_list.h:45
static PgStat_StatTabEntry * get_pgstat_tabentry_relid ( Oid  relid,
bool  isshared,
PgStat_StatDBEntry shared,
PgStat_StatDBEntry dbentry 
)
static

Definition at line 2716 of file autovacuum.c.

References HASH_FIND, hash_search(), NULL, PointerIsValid, and PgStat_StatDBEntry::tables.

Referenced by do_autovacuum(), and table_recheck_autovac().

2718 {
2719  PgStat_StatTabEntry *tabentry = NULL;
2720 
2721  if (isshared)
2722  {
2723  if (PointerIsValid(shared))
2724  tabentry = hash_search(shared->tables, &relid,
2725  HASH_FIND, NULL);
2726  }
2727  else if (PointerIsValid(dbentry))
2728  tabentry = hash_search(dbentry->tables, &relid,
2729  HASH_FIND, NULL);
2730 
2731  return tabentry;
2732 }
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:902
#define NULL
Definition: c.h:229
#define PointerIsValid(pointer)
Definition: c.h:526
bool IsAutoVacuumLauncherProcess ( void  )

Definition at line 3238 of file autovacuum.c.

References am_autovacuum_launcher.

Referenced by autovac_refresh_stats(), backend_read_statsfile(), InitPostgres(), InitProcess(), pgstat_bestart(), and ProcKill().

3239 {
3240  return am_autovacuum_launcher;
3241 }
static bool am_autovacuum_launcher
Definition: autovacuum.c:137
static void launch_worker ( TimestampTz  now)
static

Definition at line 1340 of file autovacuum.c.

References avl_dbase::adl_datid, avl_dbase::adl_next_worker, autovacuum_naptime, dlist_iter::cur, dlist_container, dlist_foreach, dlist_move_head(), do_start_worker(), OidIsValid, rebuild_database_list(), and TimestampTzPlusMilliseconds.

Referenced by AutoVacLauncherMain().

1341 {
1342  Oid dbid;
1343  dlist_iter iter;
1344 
1345  dbid = do_start_worker();
1346  if (OidIsValid(dbid))
1347  {
1348  bool found = false;
1349 
1350  /*
1351  * Walk the database list and update the corresponding entry. If the
1352  * database is not on the list, we'll recreate the list.
1353  */
1354  dlist_foreach(iter, &DatabaseList)
1355  {
1356  avl_dbase *avdb = dlist_container(avl_dbase, adl_node, iter.cur);
1357 
1358  if (avdb->adl_datid == dbid)
1359  {
1360  found = true;
1361 
1362  /*
1363  * add autovacuum_naptime seconds to the current time, and use
1364  * that as the new "next_worker" field for this database.
1365  */
1366  avdb->adl_next_worker =
1368 
1370  break;
1371  }
1372  }
1373 
1374  /*
1375  * If the database was not present in the database list, we rebuild
1376  * the list. It's possible that the database does not get into the
1377  * list anyway, for example if it's a database that doesn't have a
1378  * pgstat entry, but this is not a problem because we don't want to
1379  * schedule workers regularly into those in any case.
1380  */
1381  if (!found)
1382  rebuild_database_list(dbid);
1383  }
1384 }
int autovacuum_naptime
Definition: autovacuum.c:116
TimestampTz adl_next_worker
Definition: autovacuum.c:162
#define dlist_foreach(iter, lhead)
Definition: ilist.h:507
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:538
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
Oid adl_datid
Definition: autovacuum.c:161
static dlist_head DatabaseList
Definition: autovacuum.c:298
dlist_node * cur
Definition: ilist.h:161
#define TimestampTzPlusMilliseconds(tz, ms)
Definition: timestamp.h:56
static void dlist_move_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:385
static void rebuild_database_list(Oid newdb)
Definition: autovacuum.c:924
static Oid do_start_worker(void)
Definition: autovacuum.c:1125
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1534
static void launcher_determine_sleep ( bool  canlaunch,
bool  recursing,
struct timeval *  nap 
)
static

Definition at line 840 of file autovacuum.c.

References avl_dbase::adl_next_worker, autovacuum_naptime, dlist_is_empty(), dlist_tail_element, GetCurrentTimestamp(), InvalidOid, MAX_AUTOVAC_SLEEPTIME, MIN_AUTOVAC_SLEEPTIME, rebuild_database_list(), and TimestampDifference().

Referenced by AutoVacLauncherMain().

841 {
842  /*
843  * We sleep until the next scheduled vacuum. We trust that when the
844  * database list was built, care was taken so that no entries have times
845  * in the past; if the first entry has too close a next_worker value, or a
846  * time in the past, we will sleep a small nominal time.
847  */
848  if (!canlaunch)
849  {
850  nap->tv_sec = autovacuum_naptime;
851  nap->tv_usec = 0;
852  }
853  else if (!dlist_is_empty(&DatabaseList))
854  {
855  TimestampTz current_time = GetCurrentTimestamp();
856  TimestampTz next_wakeup;
857  avl_dbase *avdb;
858  long secs;
859  int usecs;
860 
861  avdb = dlist_tail_element(avl_dbase, adl_node, &DatabaseList);
862 
863  next_wakeup = avdb->adl_next_worker;
864  TimestampDifference(current_time, next_wakeup, &secs, &usecs);
865 
866  nap->tv_sec = secs;
867  nap->tv_usec = usecs;
868  }
869  else
870  {
871  /* list is empty, sleep for whole autovacuum_naptime seconds */
872  nap->tv_sec = autovacuum_naptime;
873  nap->tv_usec = 0;
874  }
875 
876  /*
877  * If the result is exactly zero, it means a database had an entry with
878  * time in the past. Rebuild the list so that the databases are evenly
879  * distributed again, and recalculate the time to sleep. This can happen
880  * if there are more tables needing vacuum than workers, and they all take
881  * longer to vacuum than autovacuum_naptime.
882  *
883  * We only recurse once. rebuild_database_list should always return times
884  * in the future, but it seems best not to trust too much on that.
885  */
886  if (nap->tv_sec == 0 && nap->tv_usec == 0 && !recursing)
887  {
889  launcher_determine_sleep(canlaunch, true, nap);
890  return;
891  }
892 
893  /* The smallest time we'll allow the launcher to sleep. */
894  if (nap->tv_sec <= 0 && nap->tv_usec <= MIN_AUTOVAC_SLEEPTIME * 1000)
895  {
896  nap->tv_sec = 0;
897  nap->tv_usec = MIN_AUTOVAC_SLEEPTIME * 1000;
898  }
899 
900  /*
901  * If the sleep time is too large, clamp it to an arbitrary maximum (plus
902  * any fractional seconds, for simplicity). This avoids an essentially
903  * infinite sleep in strange cases like the system clock going backwards a
904  * few years.
905  */
906  if (nap->tv_sec > MAX_AUTOVAC_SLEEPTIME)
907  nap->tv_sec = MAX_AUTOVAC_SLEEPTIME;
908 }
int autovacuum_naptime
Definition: autovacuum.c:116
TimestampTz adl_next_worker
Definition: autovacuum.c:162
#define MAX_AUTOVAC_SLEEPTIME
Definition: autovacuum.c:134
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1570
int64 TimestampTz
Definition: timestamp.h:39
#define MIN_AUTOVAC_SLEEPTIME
Definition: autovacuum.c:133
#define dlist_tail_element(type, membername, lhead)
Definition: ilist.h:496
static dlist_head DatabaseList
Definition: autovacuum.c:298
static void launcher_determine_sleep(bool canlaunch, bool recursing, struct timeval *nap)
Definition: autovacuum.c:840
#define InvalidOid
Definition: postgres_ext.h:36
static bool dlist_is_empty(dlist_head *head)
Definition: ilist.h:289
static void rebuild_database_list(Oid newdb)
Definition: autovacuum.c:924
void TimestampDifference(TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
Definition: timestamp.c:1624
static void perform_work_item ( AutoVacuumWorkItem workitem)
static

Definition at line 2590 of file autovacuum.c.

References AbortOutOfAnyTransaction(), autovac_report_workitem(), AutoVacuumWorkItem::avw_blockNumber, AVW_BRINSummarizeRange, AutoVacuumWorkItem::avw_relation, AutoVacuumWorkItem::avw_type, brin_summarize_range(), DirectFunctionCall2, elog, EmitErrorReport(), errcontext, FlushErrorState(), get_database_name(), get_namespace_name(), get_rel_name(), get_rel_namespace(), HOLD_INTERRUPTS, Int64GetDatum(), MemoryContextResetAndDeleteChildren, MemoryContextSwitchTo(), MyDatabaseId, NULL, ObjectIdGetDatum, pfree(), PG_CATCH, PG_END_TRY, PG_TRY, PortalContext, QueryCancelPending, RESUME_INTERRUPTS, StartTransactionCommand(), TopTransactionContext, and WARNING.

Referenced by do_autovacuum().

2591 {
2592  char *cur_datname = NULL;
2593  char *cur_nspname = NULL;
2594  char *cur_relname = NULL;
2595 
2596  /*
2597  * Note we do not store table info in MyWorkerInfo, since this is not
2598  * vacuuming proper.
2599  */
2600 
2601  /*
2602  * Save the relation name for a possible error message, to avoid a catalog
2603  * lookup in case of an error. If any of these return NULL, then the
2604  * relation has been dropped since last we checked; skip it. Note: they
2605  * must live in a long-lived memory context because we call vacuum and
2606  * analyze in different transactions.
2607  */
2608 
2609  cur_relname = get_rel_name(workitem->avw_relation);
2610  cur_nspname = get_namespace_name(get_rel_namespace(workitem->avw_relation));
2611  cur_datname = get_database_name(MyDatabaseId);
2612  if (!cur_relname || !cur_nspname || !cur_datname)
2613  goto deleted2;
2614 
2615  autovac_report_workitem(workitem, cur_nspname, cur_datname);
2616 
2617  /*
2618  * We will abort the current work item if something errors out, and
2619  * continue with the next one; in particular, this happens if we are
2620  * interrupted with SIGINT. Note that this means that the work item list
2621  * can be lossy.
2622  */
2623  PG_TRY();
2624  {
2625  /* have at it */
2627 
2628  switch (workitem->avw_type)
2629  {
2632  ObjectIdGetDatum(workitem->avw_relation),
2633  Int64GetDatum((int64) workitem->avw_blockNumber));
2634  break;
2635  default:
2636  elog(WARNING, "unrecognized work item found: type %d",
2637  workitem->avw_type);
2638  break;
2639  }
2640 
2641  /*
2642  * Clear a possible query-cancel signal, to avoid a late reaction to
2643  * an automatically-sent signal because of vacuuming the current table
2644  * (we're done with it, so it would make no sense to cancel at this
2645  * point.)
2646  */
2647  QueryCancelPending = false;
2648  }
2649  PG_CATCH();
2650  {
2651  /*
2652  * Abort the transaction, start a new one, and proceed with the next
2653  * table in our list.
2654  */
2655  HOLD_INTERRUPTS();
2656  errcontext("processing work entry for relation \"%s.%s.%s\"",
2657  cur_datname, cur_nspname, cur_relname);
2658  EmitErrorReport();
2659 
2660  /* this resets the PGXACT flags too */
2662  FlushErrorState();
2664 
2665  /* restart our transaction for the following operations */
2668  }
2669  PG_END_TRY();
2670 
2671  /* We intentionally do not set did_vacuum here */
2672 
2673  /* be tidy */
2674 deleted2:
2675  if (cur_datname)
2676  pfree(cur_datname);
2677  if (cur_nspname)
2678  pfree(cur_nspname);
2679  if (cur_relname)
2680  pfree(cur_relname);
2681 }
AutoVacuumWorkItemType avw_type
Definition: autovacuum.c:256
MemoryContext TopTransactionContext
Definition: mcxt.c:48
Oid get_rel_namespace(Oid relid)
Definition: lsyscache.c:1750
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
volatile bool QueryCancelPending
Definition: globals.c:30
void AbortOutOfAnyTransaction(void)
Definition: xact.c:4225
void FlushErrorState(void)
Definition: elog.c:1587
MemoryContext PortalContext
Definition: mcxt.c:52
Datum brin_summarize_range(PG_FUNCTION_ARGS)
Definition: brin.c:851
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:117
void pfree(void *pointer)
Definition: mcxt.c:950
#define ObjectIdGetDatum(X)
Definition: postgres.h:513
char * get_database_name(Oid dbid)
Definition: dbcommands.c:2056
char * get_namespace_name(Oid nspid)
Definition: lsyscache.c:3033
static void autovac_report_workitem(AutoVacuumWorkItem *workitem, const char *nspname, const char *relname)
Definition: autovacuum.c:3135
Datum Int64GetDatum(int64 X)
Definition: fmgr.c:1791
#define WARNING
Definition: elog.h:40
#define MemoryContextResetAndDeleteChildren(ctx)
Definition: memutils.h:67
Oid MyDatabaseId
Definition: globals.c:77
BlockNumber avw_blockNumber
Definition: autovacuum.c:261
void EmitErrorReport(void)
Definition: elog.c:1446
#define PG_CATCH()
Definition: elog.h:293
#define NULL
Definition: c.h:229
void StartTransactionCommand(void)
Definition: xact.c:2680
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:115
#define errcontext
Definition: elog.h:164
#define elog
Definition: elog.h:219
#define PG_TRY()
Definition: elog.h:284
char * get_rel_name(Oid relid)
Definition: lsyscache.c:1726
#define DirectFunctionCall2(func, arg1, arg2)
Definition: fmgr.h:586
#define PG_END_TRY()
Definition: elog.h:300
static void rebuild_database_list ( Oid  newdb)
static

Definition at line 924 of file autovacuum.c.

References avl_dbase::adl_datid, avl_dbase::adl_next_worker, avl_dbase::adl_node, avl_dbase::adl_score, avw_dbase::adw_datid, ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate(), autovac_refresh_stats(), autovacuum_naptime, dlist_iter::cur, db_comparator(), dblist, dlist_container, dlist_foreach, dlist_init(), dlist_push_head(), HASHCTL::entrysize, get_database_list(), GetCurrentTimestamp(), HASH_BLOBS, HASH_CONTEXT, hash_create(), HASH_ELEM, HASH_ENTER, hash_search(), hash_seq_init(), hash_seq_search(), HASHCTL::hcxt, i, HASHCTL::keysize, lfirst, MemoryContextDelete(), MemoryContextSwitchTo(), MIN_AUTOVAC_SLEEPTIME, NULL, OidIsValid, palloc(), pgstat_fetch_stat_dbentry(), qsort, and TimestampTzPlusMilliseconds.

Referenced by AutoVacLauncherMain(), do_start_worker(), launch_worker(), and launcher_determine_sleep().

925 {
926  List *dblist;
927  ListCell *cell;
928  MemoryContext newcxt;
929  MemoryContext oldcxt;
930  MemoryContext tmpcxt;
931  HASHCTL hctl;
932  int score;
933  int nelems;
934  HTAB *dbhash;
935  dlist_iter iter;
936 
937  /* use fresh stats */
939 
941  "AV dblist",
943  tmpcxt = AllocSetContextCreate(newcxt,
944  "tmp AV dblist",
946  oldcxt = MemoryContextSwitchTo(tmpcxt);
947 
948  /*
949  * Implementing this is not as simple as it sounds, because we need to put
950  * the new database at the end of the list; next the databases that were
951  * already on the list, and finally (at the tail of the list) all the
952  * other databases that are not on the existing list.
953  *
954  * To do this, we build an empty hash table of scored databases. We will
955  * start with the lowest score (zero) for the new database, then
956  * increasing scores for the databases in the existing list, in order, and
957  * lastly increasing scores for all databases gotten via
958  * get_database_list() that are not already on the hash.
959  *
960  * Then we will put all the hash elements into an array, sort the array by
961  * score, and finally put the array elements into the new doubly linked
962  * list.
963  */
964  hctl.keysize = sizeof(Oid);
965  hctl.entrysize = sizeof(avl_dbase);
966  hctl.hcxt = tmpcxt;
967  dbhash = hash_create("db hash", 20, &hctl, /* magic number here FIXME */
969 
970  /* start by inserting the new database */
971  score = 0;
972  if (OidIsValid(newdb))
973  {
974  avl_dbase *db;
975  PgStat_StatDBEntry *entry;
976 
977  /* only consider this database if it has a pgstat entry */
978  entry = pgstat_fetch_stat_dbentry(newdb);
979  if (entry != NULL)
980  {
981  /* we assume it isn't found because the hash was just created */
982  db = hash_search(dbhash, &newdb, HASH_ENTER, NULL);
983 
984  /* hash_search already filled in the key */
985  db->adl_score = score++;
986  /* next_worker is filled in later */
987  }
988  }
989 
990  /* Now insert the databases from the existing list */
992  {
993  avl_dbase *avdb = dlist_container(avl_dbase, adl_node, iter.cur);
994  avl_dbase *db;
995  bool found;
996  PgStat_StatDBEntry *entry;
997 
998  /*
999  * skip databases with no stat entries -- in particular, this gets rid
1000  * of dropped databases
1001  */
1002  entry = pgstat_fetch_stat_dbentry(avdb->adl_datid);
1003  if (entry == NULL)
1004  continue;
1005 
1006  db = hash_search(dbhash, &(avdb->adl_datid), HASH_ENTER, &found);
1007 
1008  if (!found)
1009  {
1010  /* hash_search already filled in the key */
1011  db->adl_score = score++;
1012  /* next_worker is filled in later */
1013  }
1014  }
1015 
1016  /* finally, insert all qualifying databases not previously inserted */
1017  dblist = get_database_list();
1018  foreach(cell, dblist)
1019  {
1020  avw_dbase *avdb = lfirst(cell);
1021  avl_dbase *db;
1022  bool found;
1023  PgStat_StatDBEntry *entry;
1024 
1025  /* only consider databases with a pgstat entry */
1026  entry = pgstat_fetch_stat_dbentry(avdb->adw_datid);
1027  if (entry == NULL)
1028  continue;
1029 
1030  db = hash_search(dbhash, &(avdb->adw_datid), HASH_ENTER, &found);
1031  /* only update the score if the database was not already on the hash */
1032  if (!found)
1033  {
1034  /* hash_search already filled in the key */
1035  db->adl_score = score++;
1036  /* next_worker is filled in later */
1037  }
1038  }
1039  nelems = score;
1040 
1041  /* from here on, the allocated memory belongs to the new list */
1042  MemoryContextSwitchTo(newcxt);
1044 
1045  if (nelems > 0)
1046  {
1047  TimestampTz current_time;
1048  int millis_increment;
1049  avl_dbase *dbary;
1050  avl_dbase *db;
1051  HASH_SEQ_STATUS seq;
1052  int i;
1053 
1054  /* put all the hash elements into an array */
1055  dbary = palloc(nelems * sizeof(avl_dbase));
1056 
1057  i = 0;
1058  hash_seq_init(&seq, dbhash);
1059  while ((db = hash_seq_search(&seq)) != NULL)
1060  memcpy(&(dbary[i++]), db, sizeof(avl_dbase));
1061 
1062  /* sort the array */
1063  qsort(dbary, nelems, sizeof(avl_dbase), db_comparator);
1064 
1065  /*
1066  * Determine the time interval between databases in the schedule. If
1067  * we see that the configured naptime would take us to sleep times
1068  * lower than our min sleep time (which launcher_determine_sleep is
1069  * coded not to allow), silently use a larger naptime (but don't touch
1070  * the GUC variable).
1071  */
1072  millis_increment = 1000.0 * autovacuum_naptime / nelems;
1073  if (millis_increment <= MIN_AUTOVAC_SLEEPTIME)
1074  millis_increment = MIN_AUTOVAC_SLEEPTIME * 1.1;
1075 
1076  current_time = GetCurrentTimestamp();
1077 
1078  /*
1079  * move the elements from the array into the dllist, setting the
1080  * next_worker while walking the array
1081  */
1082  for (i = 0; i < nelems; i++)
1083  {
1084  avl_dbase *db = &(dbary[i]);
1085 
1086  current_time = TimestampTzPlusMilliseconds(current_time,
1087  millis_increment);
1088  db->adl_next_worker = current_time;
1089 
1090  /* later elements should go closer to the head of the list */
1092  }
1093  }
1094 
1095  /* all done, clean up memory */
1096  if (DatabaseListCxt != NULL)
1098  MemoryContextDelete(tmpcxt);
1099  DatabaseListCxt = newcxt;
1100  MemoryContextSwitchTo(oldcxt);
1101 }
int autovacuum_naptime
Definition: autovacuum.c:116
TimestampTz adl_next_worker
Definition: autovacuum.c:162
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:200
#define HASH_CONTEXT
Definition: hsearch.h:93
#define HASH_ELEM
Definition: hsearch.h:87
MemoryContext hcxt
Definition: hsearch.h:78
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1570
int64 TimestampTz
Definition: timestamp.h:39
#define dlist_foreach(iter, lhead)
Definition: ilist.h:507
int adl_score
Definition: autovacuum.c:163
static MemoryContext AutovacMemCxt
Definition: autovacuum.c:156
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
Size entrysize
Definition: hsearch.h:73
struct avl_dbase avl_dbase
static void autovac_refresh_stats(void)
Definition: autovacuum.c:3322
PgStat_StatDBEntry * pgstat_fetch_stat_dbentry(Oid dbid)
Definition: pgstat.c:2387
#define MIN_AUTOVAC_SLEEPTIME
Definition: autovacuum.c:133
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:902
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:538
Definition: dynahash.c:208
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
static List * get_database_list(void)
Definition: autovacuum.c:1863
Oid adl_datid
Definition: autovacuum.c:161
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:165
_stringlist * dblist
Definition: pg_regress.c:72
static dlist_head DatabaseList
Definition: autovacuum.c:298
static int db_comparator(const void *a, const void *b)
Definition: autovacuum.c:1105
#define HASH_BLOBS
Definition: hsearch.h:88
MemoryContext AllocSetContextCreate(MemoryContext parent, const char *name, Size minContextSize, Size initBlockSize, Size maxBlockSize)
Definition: aset.c:322
HTAB * hash_create(const char *tabname, long nelem, HASHCTL *info, int flags)
Definition: dynahash.c:316
Oid adw_datid
Definition: autovacuum.c:170
Size keysize
Definition: hsearch.h:72
dlist_node * cur
Definition: ilist.h:161
#define TimestampTzPlusMilliseconds(tz, ms)
Definition: timestamp.h:56
static void dlist_init(dlist_head *head)
Definition: ilist.h:278
#define NULL
Definition: c.h:229
#define lfirst(lc)
Definition: pg_list.h:106
void * hash_seq_search(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1385
void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp)
Definition: dynahash.c:1375
dlist_node adl_node
Definition: autovacuum.c:164
void * palloc(Size size)
Definition: mcxt.c:849
static MemoryContext DatabaseListCxt
Definition: autovacuum.c:299
int i
#define qsort(a, b, c, d)
Definition: port.h:443
Definition: pg_list.h:45
static void relation_needs_vacanalyze ( Oid  relid,
AutoVacOpts relopts,
Form_pg_class  classForm,
PgStat_StatTabEntry tabentry,
int  effective_multixact_freeze_max_age,
bool dovacuum,
bool doanalyze,
bool wraparound 
)
static

Definition at line 2925 of file autovacuum.c.

References AutoVacOpts::analyze_scale_factor, AutoVacOpts::analyze_threshold, AssertArg, autovacuum_anl_scale, autovacuum_anl_thresh, autovacuum_freeze_max_age, autovacuum_vac_scale, autovacuum_vac_thresh, AutoVacuumingActive(), PgStat_StatTabEntry::changes_since_analyze, DEBUG3, elog, AutoVacOpts::enabled, FirstMultiXactId, FirstNormalTransactionId, AutoVacOpts::freeze_max_age, Min, AutoVacOpts::multixact_freeze_max_age, MultiXactIdPrecedes(), PgStat_StatTabEntry::n_dead_tuples, NameStr, NULL, OidIsValid, PointerIsValid, recentMulti, recentXid, StatisticRelationId, TransactionIdIsNormal, TransactionIdPrecedes(), AutoVacOpts::vacuum_scale_factor, and AutoVacOpts::vacuum_threshold.

Referenced by do_autovacuum(), and table_recheck_autovac().

2934 {
2935  bool force_vacuum;
2936  bool av_enabled;
2937  float4 reltuples; /* pg_class.reltuples */
2938 
2939  /* constants from reloptions or GUC variables */
2940  int vac_base_thresh,
2941  anl_base_thresh;
2942  float4 vac_scale_factor,
2943  anl_scale_factor;
2944 
2945  /* thresholds calculated from above constants */
2946  float4 vacthresh,
2947  anlthresh;
2948 
2949  /* number of vacuum (resp. analyze) tuples at this time */
2950  float4 vactuples,
2951  anltuples;
2952 
2953  /* freeze parameters */
2954  int freeze_max_age;
2955  int multixact_freeze_max_age;
2956  TransactionId xidForceLimit;
2957  MultiXactId multiForceLimit;
2958 
2959  AssertArg(classForm != NULL);
2960  AssertArg(OidIsValid(relid));
2961 
2962  /*
2963  * Determine vacuum/analyze equation parameters. We have two possible
2964  * sources: the passed reloptions (which could be a main table or a toast
2965  * table), or the autovacuum GUC variables.
2966  */
2967 
2968  /* -1 in autovac setting means use plain vacuum_cost_delay */
2969  vac_scale_factor = (relopts && relopts->vacuum_scale_factor >= 0)
2970  ? relopts->vacuum_scale_factor
2972 
2973  vac_base_thresh = (relopts && relopts->vacuum_threshold >= 0)
2974  ? relopts->vacuum_threshold
2976 
2977  anl_scale_factor = (relopts && relopts->analyze_scale_factor >= 0)
2978  ? relopts->analyze_scale_factor
2980 
2981  anl_base_thresh = (relopts && relopts->analyze_threshold >= 0)
2982  ? relopts->analyze_threshold
2984 
2985  freeze_max_age = (relopts && relopts->freeze_max_age >= 0)
2988 
2989  multixact_freeze_max_age = (relopts && relopts->multixact_freeze_max_age >= 0)
2990  ? Min(relopts->multixact_freeze_max_age, effective_multixact_freeze_max_age)
2991  : effective_multixact_freeze_max_age;
2992 
2993  av_enabled = (relopts ? relopts->enabled : true);
2994 
2995  /* Force vacuum if table is at risk of wraparound */
2996  xidForceLimit = recentXid - freeze_max_age;
2997  if (xidForceLimit < FirstNormalTransactionId)
2998  xidForceLimit -= FirstNormalTransactionId;
2999  force_vacuum = (TransactionIdIsNormal(classForm->relfrozenxid) &&
3000  TransactionIdPrecedes(classForm->relfrozenxid,
3001  xidForceLimit));
3002  if (!force_vacuum)
3003  {
3004  multiForceLimit = recentMulti - multixact_freeze_max_age;
3005  if (multiForceLimit < FirstMultiXactId)
3006  multiForceLimit -= FirstMultiXactId;
3007  force_vacuum = MultiXactIdPrecedes(classForm->relminmxid,
3008  multiForceLimit);
3009  }
3010  *wraparound = force_vacuum;
3011 
3012  /* User disabled it in pg_class.reloptions? (But ignore if at risk) */
3013  if (!av_enabled && !force_vacuum)
3014  {
3015  *doanalyze = false;
3016  *dovacuum = false;
3017  return;
3018  }
3019 
3020  /*
3021  * If we found the table in the stats hash, and autovacuum is currently
3022  * enabled, make a threshold-based decision whether to vacuum and/or
3023  * analyze. If autovacuum is currently disabled, we must be here for
3024  * anti-wraparound vacuuming only, so don't vacuum (or analyze) anything
3025  * that's not being forced.
3026  */
3027  if (PointerIsValid(tabentry) && AutoVacuumingActive())
3028  {
3029  reltuples = classForm->reltuples;
3030  vactuples = tabentry->n_dead_tuples;
3031  anltuples = tabentry->changes_since_analyze;
3032 
3033  vacthresh = (float4) vac_base_thresh + vac_scale_factor * reltuples;
3034  anlthresh = (float4) anl_base_thresh + anl_scale_factor * reltuples;
3035 
3036  /*
3037  * Note that we don't need to take special consideration for stat
3038  * reset, because if that happens, the last vacuum and analyze counts
3039  * will be reset too.
3040  */
3041  elog(DEBUG3, "%s: vac: %.0f (threshold %.0f), anl: %.0f (threshold %.0f)",
3042  NameStr(classForm->relname),
3043  vactuples, vacthresh, anltuples, anlthresh);
3044 
3045  /* Determine if this table needs vacuum or analyze. */
3046  *dovacuum = force_vacuum || (vactuples > vacthresh);
3047  *doanalyze = (anltuples > anlthresh);
3048  }
3049  else
3050  {
3051  /*
3052  * Skip a table not found in stat hash, unless we have to force vacuum
3053  * for anti-wrap purposes. If it's not acted upon, there's no need to
3054  * vacuum it.
3055  */
3056  *dovacuum = force_vacuum;
3057  *doanalyze = false;
3058  }
3059 
3060  /* ANALYZE refuses to work with pg_statistic */
3061  if (relid == StatisticRelationId)
3062  *doanalyze = false;
3063 }
double autovacuum_anl_scale
Definition: autovacuum.c:120
uint32 TransactionId
Definition: c.h:397
#define DEBUG3
Definition: elog.h:23
float8 vacuum_scale_factor
Definition: rel.h:272
#define Min(x, y)
Definition: c.h:807
static MultiXactId recentMulti
Definition: autovacuum.c:147
#define OidIsValid(objectId)
Definition: c.h:538
#define FirstNormalTransactionId
Definition: transam.h:34
bool AutoVacuumingActive(void)
Definition: autovacuum.c:3175
int autovacuum_freeze_max_age
Definition: autovacuum.c:121
PgStat_Counter n_dead_tuples
Definition: pgstat.h:630
int analyze_threshold
Definition: rel.h:262
int autovacuum_vac_thresh
Definition: autovacuum.c:117
#define FirstMultiXactId
Definition: multixact.h:24
#define AssertArg(condition)
Definition: c.h:678
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:300
float float4
Definition: c.h:380
int vacuum_threshold
Definition: rel.h:261
#define StatisticRelationId
Definition: pg_statistic.h:29
static TransactionId recentXid
Definition: autovacuum.c:146
PgStat_Counter changes_since_analyze
Definition: pgstat.h:631
double autovacuum_vac_scale
Definition: autovacuum.c:118
float8 analyze_scale_factor
Definition: rel.h:273
TransactionId MultiXactId
Definition: c.h:407
int freeze_max_age
Definition: rel.h:266
#define NULL
Definition: c.h:229
bool enabled
Definition: rel.h:260
bool MultiXactIdPrecedes(MultiXactId multi1, MultiXactId multi2)
Definition: multixact.c:3140
#define NameStr(name)
Definition: c.h:499
int multixact_freeze_max_age
Definition: rel.h:269
#define elog
Definition: elog.h:219
#define TransactionIdIsNormal(xid)
Definition: transam.h:42
#define PointerIsValid(pointer)
Definition: c.h:526
int autovacuum_anl_thresh
Definition: autovacuum.c:119
int StartAutoVacLauncher ( void  )

Definition at line 394 of file autovacuum.c.

References AutoVacLauncherMain(), AutoVacPID, ClosePostmasterPorts(), ereport, errmsg(), fork_process(), InitPostmasterChild(), LOG, and NULL.

Referenced by reaper(), and ServerLoop().

395 {
396  pid_t AutoVacPID;
397 
398 #ifdef EXEC_BACKEND
399  switch ((AutoVacPID = avlauncher_forkexec()))
400 #else
401  switch ((AutoVacPID = fork_process()))
402 #endif
403  {
404  case -1:
405  ereport(LOG,
406  (errmsg("could not fork autovacuum launcher process: %m")));
407  return 0;
408 
409 #ifndef EXEC_BACKEND
410  case 0:
411  /* in postmaster child ... */
413 
414  /* Close the postmaster's sockets */
415  ClosePostmasterPorts(false);
416 
418  break;
419 #endif
420  default:
421  return (int) AutoVacPID;
422  }
423 
424  /* shouldn't get here */
425  return 0;
426 }
void InitPostmasterChild(void)
Definition: miscinit.c:176
NON_EXEC_STATIC void AutoVacLauncherMain(int argc, char *argv[]) pg_attribute_noreturn()
Definition: autovacuum.c:432
pid_t fork_process(void)
Definition: fork_process.c:31
#define LOG
Definition: elog.h:26
void ClosePostmasterPorts(bool am_syslogger)
Definition: postmaster.c:2449
#define ereport(elevel, rest)
Definition: elog.h:122
#define NULL
Definition: c.h:229
static pid_t AutoVacPID
Definition: postmaster.c:253
int errmsg(const char *fmt,...)
Definition: elog.c:797
int StartAutoVacWorker ( void  )

Definition at line 1476 of file autovacuum.c.

References AutoVacWorkerMain(), ClosePostmasterPorts(), ereport, errmsg(), fork_process(), InitPostmasterChild(), LOG, and NULL.

Referenced by StartAutovacuumWorker().

1477 {
1478  pid_t worker_pid;
1479 
1480 #ifdef EXEC_BACKEND
1481  switch ((worker_pid = avworker_forkexec()))
1482 #else
1483  switch ((worker_pid = fork_process()))
1484 #endif
1485  {
1486  case -1:
1487  ereport(LOG,
1488  (errmsg("could not fork autovacuum worker process: %m")));
1489  return 0;
1490 
1491 #ifndef EXEC_BACKEND
1492  case 0:
1493  /* in postmaster child ... */
1495 
1496  /* Close the postmaster's sockets */
1497  ClosePostmasterPorts(false);
1498 
1499  AutoVacWorkerMain(0, NULL);
1500  break;
1501 #endif
1502  default:
1503  return (int) worker_pid;
1504  }
1505 
1506  /* shouldn't get here */
1507  return 0;
1508 }
void InitPostmasterChild(void)
Definition: miscinit.c:176
pid_t fork_process(void)
Definition: fork_process.c:31
#define LOG
Definition: elog.h:26
NON_EXEC_STATIC void AutoVacWorkerMain(int argc, char *argv[]) pg_attribute_noreturn()
Definition: autovacuum.c:1514
void ClosePostmasterPorts(bool am_syslogger)
Definition: postmaster.c:2449
#define ereport(elevel, rest)
Definition: elog.h:122
#define NULL
Definition: c.h:229
int errmsg(const char *fmt,...)
Definition: elog.c:797
static autovac_table * table_recheck_autovac ( Oid  relid,
HTAB table_toast_map,
TupleDesc  pg_class_desc,
int  effective_multixact_freeze_max_age 
)
static

Definition at line 2743 of file autovacuum.c.

References av_relation::ar_hasrelopts, av_relation::ar_reloptions, autovac_table::at_datname, autovac_table::at_dobalance, autovac_table::at_nspname, autovac_table::at_params, autovac_table::at_relid, autovac_table::at_relname, autovac_table::at_sharedrel, autovac_table::at_vacoptions, autovac_table::at_vacuum_cost_delay, autovac_table::at_vacuum_cost_limit, autovac_refresh_stats(), autovacuum_vac_cost_delay, autovacuum_vac_cost_limit, default_freeze_min_age, default_freeze_table_age, default_multixact_freeze_min_age, default_multixact_freeze_table_age, extract_autovac_opts(), VacuumParams::freeze_min_age, AutoVacOpts::freeze_min_age, VacuumParams::freeze_table_age, AutoVacOpts::freeze_table_age, get_pgstat_tabentry_relid(), GETSTRUCT, HASH_FIND, hash_search(), heap_freetuple(), HeapTupleIsValid, InvalidOid, VacuumParams::is_wraparound, Log_autovacuum_min_duration, VacuumParams::log_min_duration, AutoVacOpts::log_min_duration, VacuumParams::multixact_freeze_min_age, AutoVacOpts::multixact_freeze_min_age, VacuumParams::multixact_freeze_table_age, AutoVacOpts::multixact_freeze_table_age, MyDatabaseId, NULL, ObjectIdGetDatum, palloc(), pgstat_fetch_stat_dbentry(), relation_needs_vacanalyze(), RELKIND_TOASTVALUE, RELOID, SearchSysCacheCopy1, VACOPT_ANALYZE, VACOPT_NOWAIT, VACOPT_SKIPTOAST, VACOPT_VACUUM, AutoVacOpts::vacuum_cost_delay, AutoVacOpts::vacuum_cost_limit, VacuumCostDelay, and VacuumCostLimit.

Referenced by do_autovacuum().

2746 {
2747  Form_pg_class classForm;
2748  HeapTuple classTup;
2749  bool dovacuum;
2750  bool doanalyze;
2751  autovac_table *tab = NULL;
2752  PgStat_StatTabEntry *tabentry;
2753  PgStat_StatDBEntry *shared;
2754  PgStat_StatDBEntry *dbentry;
2755  bool wraparound;
2756  AutoVacOpts *avopts;
2757 
2758  /* use fresh stats */
2760 
2763 
2764  /* fetch the relation's relcache entry */
2765  classTup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
2766  if (!HeapTupleIsValid(classTup))
2767  return NULL;
2768  classForm = (Form_pg_class) GETSTRUCT(classTup);
2769 
2770  /*
2771  * Get the applicable reloptions. If it is a TOAST table, try to get the
2772  * main table reloptions if the toast table itself doesn't have.
2773  */
2774  avopts = extract_autovac_opts(classTup, pg_class_desc);
2775  if (classForm->relkind == RELKIND_TOASTVALUE &&
2776  avopts == NULL && table_toast_map != NULL)
2777  {
2778  av_relation *hentry;
2779  bool found;
2780 
2781  hentry = hash_search(table_toast_map, &relid, HASH_FIND, &found);
2782  if (found && hentry->ar_hasrelopts)
2783  avopts = &hentry->ar_reloptions;
2784  }
2785 
2786  /* fetch the pgstat table entry */
2787  tabentry = get_pgstat_tabentry_relid(relid, classForm->relisshared,
2788  shared, dbentry);
2789 
2790  relation_needs_vacanalyze(relid, avopts, classForm, tabentry,
2791  effective_multixact_freeze_max_age,
2792  &dovacuum, &doanalyze, &wraparound);
2793 
2794  /* ignore ANALYZE for toast tables */
2795  if (classForm->relkind == RELKIND_TOASTVALUE)
2796  doanalyze = false;
2797 
2798  /* OK, it needs something done */
2799  if (doanalyze || dovacuum)
2800  {
2801  int freeze_min_age;
2802  int freeze_table_age;
2803  int multixact_freeze_min_age;
2804  int multixact_freeze_table_age;
2805  int vac_cost_limit;
2806  int vac_cost_delay;
2807  int log_min_duration;
2808 
2809  /*
2810  * Calculate the vacuum cost parameters and the freeze ages. If there
2811  * are options set in pg_class.reloptions, use them; in the case of a
2812  * toast table, try the main table too. Otherwise use the GUC
2813  * defaults, autovacuum's own first and plain vacuum second.
2814  */
2815 
2816  /* -1 in autovac setting means use plain vacuum_cost_delay */
2817  vac_cost_delay = (avopts && avopts->vacuum_cost_delay >= 0)
2818  ? avopts->vacuum_cost_delay
2819  : (autovacuum_vac_cost_delay >= 0)
2821  : VacuumCostDelay;
2822 
2823  /* 0 or -1 in autovac setting means use plain vacuum_cost_limit */
2824  vac_cost_limit = (avopts && avopts->vacuum_cost_limit > 0)
2825  ? avopts->vacuum_cost_limit
2828  : VacuumCostLimit;
2829 
2830  /* -1 in autovac setting means use log_autovacuum_min_duration */
2831  log_min_duration = (avopts && avopts->log_min_duration >= 0)
2832  ? avopts->log_min_duration
2834 
2835  /* these do not have autovacuum-specific settings */
2836  freeze_min_age = (avopts && avopts->freeze_min_age >= 0)
2837  ? avopts->freeze_min_age
2839 
2840  freeze_table_age = (avopts && avopts->freeze_table_age >= 0)
2841  ? avopts->freeze_table_age
2843 
2844  multixact_freeze_min_age = (avopts &&
2845  avopts->multixact_freeze_min_age >= 0)
2846  ? avopts->multixact_freeze_min_age
2848 
2849  multixact_freeze_table_age = (avopts &&
2850  avopts->multixact_freeze_table_age >= 0)
2851  ? avopts->multixact_freeze_table_age
2853 
2854  tab = palloc(sizeof(autovac_table));
2855  tab->at_relid = relid;
2856  tab->at_sharedrel = classForm->relisshared;
2858  (dovacuum ? VACOPT_VACUUM : 0) |
2859  (doanalyze ? VACOPT_ANALYZE : 0) |
2860  (!wraparound ? VACOPT_NOWAIT : 0);
2861  tab->at_params.freeze_min_age = freeze_min_age;
2862  tab->at_params.freeze_table_age = freeze_table_age;
2863  tab->at_params.multixact_freeze_min_age = multixact_freeze_min_age;
2864  tab->at_params.multixact_freeze_table_age = multixact_freeze_table_age;
2865  tab->at_params.is_wraparound = wraparound;
2866  tab->at_params.log_min_duration = log_min_duration;
2867  tab->at_vacuum_cost_limit = vac_cost_limit;
2868  tab->at_vacuum_cost_delay = vac_cost_delay;
2869  tab->at_relname = NULL;
2870  tab->at_nspname = NULL;
2871  tab->at_datname = NULL;
2872 
2873  /*
2874  * If any of the cost delay parameters has been set individually for
2875  * this table, disable the balancing algorithm.
2876  */
2877  tab->at_dobalance =
2878  !(avopts && (avopts->vacuum_cost_limit > 0 ||
2879  avopts->vacuum_cost_delay > 0));
2880  }
2881 
2882  heap_freetuple(classTup);
2883 
2884  return tab;
2885 }
int vacuum_cost_delay
Definition: rel.h:263
int multixact_freeze_table_age
Definition: vacuum.h:142
static int default_freeze_table_age
Definition: autovacuum.c:151
#define GETSTRUCT(TUP)
Definition: htup_details.h:656
int at_vacuum_cost_delay
Definition: autovacuum.c:193
static int default_multixact_freeze_min_age
Definition: autovacuum.c:152
int freeze_min_age
Definition: rel.h:265
static void autovac_refresh_stats(void)
Definition: autovacuum.c:3322
PgStat_StatDBEntry * pgstat_fetch_stat_dbentry(Oid dbid)
Definition: pgstat.c:2387
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:902
char * at_datname
Definition: autovacuum.c:199
void heap_freetuple(HeapTuple htup)
Definition: heaptuple.c:1372
int freeze_table_age
Definition: vacuum.h:139
int autovacuum_vac_cost_limit
Definition: autovacuum.c:125
bool at_sharedrel
Definition: autovacuum.c:196
int freeze_table_age
Definition: rel.h:267
int at_vacuum_cost_limit
Definition: autovacuum.c:194
char * at_relname
Definition: autovacuum.c:197
#define ObjectIdGetDatum(X)
Definition: postgres.h:513
int VacuumCostLimit
Definition: globals.c:132
int freeze_min_age
Definition: vacuum.h:138
bool is_wraparound
Definition: vacuum.h:144
static AutoVacOpts * extract_autovac_opts(HeapTuple tup, TupleDesc pg_class_desc)
Definition: autovacuum.c:2690
static PgStat_StatTabEntry * get_pgstat_tabentry_relid(Oid relid, bool isshared, PgStat_StatDBEntry *shared, PgStat_StatDBEntry *dbentry)
Definition: autovacuum.c:2716
static void relation_needs_vacanalyze(Oid relid, AutoVacOpts *relopts, Form_pg_class classForm, PgStat_StatTabEntry *tabentry, int effective_multixact_freeze_max_age, bool *dovacuum, bool *doanalyze, bool *wraparound)
Definition: autovacuum.c:2925
int autovacuum_vac_cost_delay
Definition: autovacuum.c:124
char * at_nspname
Definition: autovacuum.c:198
int multixact_freeze_table_age
Definition: rel.h:270
#define RELKIND_TOASTVALUE
Definition: pg_class.h:163
Oid MyDatabaseId
Definition: globals.c:77
#define InvalidOid
Definition: postgres_ext.h:36
int VacuumCostDelay
Definition: globals.c:133
VacuumParams at_params
Definition: autovacuum.c:192
int vacuum_cost_limit
Definition: rel.h:264
#define HeapTupleIsValid(tuple)
Definition: htup.h:77
#define NULL
Definition: c.h:229
int multixact_freeze_min_age
Definition: rel.h:268
int log_min_duration
Definition: vacuum.h:145
int log_min_duration
Definition: rel.h:271
int Log_autovacuum_min_duration
Definition: autovacuum.c:127
FormData_pg_class * Form_pg_class
Definition: pg_class.h:95
#define SearchSysCacheCopy1(cacheId, key1)
Definition: syscache.h:165
AutoVacOpts ar_reloptions
Definition: autovacuum.c:183
void * palloc(Size size)
Definition: mcxt.c:849
bool ar_hasrelopts
Definition: autovacuum.c:182
static int default_multixact_freeze_table_age
Definition: autovacuum.c:153
int multixact_freeze_min_age
Definition: vacuum.h:140
static int default_freeze_min_age
Definition: autovacuum.c:150
bool at_dobalance
Definition: autovacuum.c:195

Variable Documentation

bool am_autovacuum_launcher = false
static

Definition at line 137 of file autovacuum.c.

Referenced by AutoVacLauncherMain(), and IsAutoVacuumLauncherProcess().

bool am_autovacuum_worker = false
static

Definition at line 138 of file autovacuum.c.

Referenced by AutoVacWorkerMain(), and IsAutoVacuumWorkerProcess().

MemoryContext AutovacMemCxt
static

Definition at line 156 of file autovacuum.c.

double autovacuum_anl_scale

Definition at line 120 of file autovacuum.c.

Referenced by relation_needs_vacanalyze().

int autovacuum_anl_thresh

Definition at line 119 of file autovacuum.c.

Referenced by relation_needs_vacanalyze().

int autovacuum_freeze_max_age
int autovacuum_multixact_freeze_max_age

Definition at line 122 of file autovacuum.c.

Referenced by MultiXactMemberFreezeThreshold(), and SetMultiXactIdLimit().

int autovacuum_naptime
bool autovacuum_start_daemon = false

Definition at line 113 of file autovacuum.c.

Referenced by autovac_init(), and AutoVacuumingActive().

int autovacuum_vac_cost_delay

Definition at line 124 of file autovacuum.c.

Referenced by autovac_balance_cost(), and table_recheck_autovac().

int autovacuum_vac_cost_limit

Definition at line 125 of file autovacuum.c.

Referenced by autovac_balance_cost(), and table_recheck_autovac().

double autovacuum_vac_scale

Definition at line 118 of file autovacuum.c.

Referenced by relation_needs_vacanalyze().

int autovacuum_vac_thresh

Definition at line 117 of file autovacuum.c.

Referenced by relation_needs_vacanalyze().

int autovacuum_work_mem = -1

Definition at line 115 of file autovacuum.c.

Referenced by ginInsertCleanup(), and lazy_space_alloc().

int AutovacuumLauncherPid = 0

Definition at line 305 of file autovacuum.c.

Referenced by FreeWorkerInfo(), and ProcKill().

AutoVacuumShmemStruct* AutoVacuumShmem
static

Definition at line 292 of file autovacuum.c.

dlist_head DatabaseList = DLIST_STATIC_INIT(DatabaseList)
static

Definition at line 298 of file autovacuum.c.

MemoryContext DatabaseListCxt = NULL
static

Definition at line 299 of file autovacuum.c.

int default_freeze_min_age
static

Definition at line 150 of file autovacuum.c.

Referenced by do_autovacuum(), and table_recheck_autovac().

int default_freeze_table_age
static

Definition at line 151 of file autovacuum.c.

Referenced by do_autovacuum(), and table_recheck_autovac().

int default_multixact_freeze_min_age
static

Definition at line 152 of file autovacuum.c.

Referenced by do_autovacuum(), and table_recheck_autovac().

int default_multixact_freeze_table_age
static

Definition at line 153 of file autovacuum.c.

Referenced by do_autovacuum(), and table_recheck_autovac().

volatile sig_atomic_t got_SIGHUP = false
static

Definition at line 141 of file autovacuum.c.

Referenced by AutoVacLauncherMain(), av_sighup_handler(), and do_autovacuum().

volatile sig_atomic_t got_SIGTERM = false
static

Definition at line 143 of file autovacuum.c.

Referenced by AutoVacLauncherMain(), and avl_sigterm_handler().

volatile sig_atomic_t got_SIGUSR2 = false
static

Definition at line 142 of file autovacuum.c.

Referenced by AutoVacLauncherMain(), and avl_sigusr2_handler().

int Log_autovacuum_min_duration = -1

Definition at line 127 of file autovacuum.c.

Referenced by table_recheck_autovac().

WorkerInfo MyWorkerInfo = NULL
static

Definition at line 302 of file autovacuum.c.

MultiXactId recentMulti
static

Definition at line 147 of file autovacuum.c.

Referenced by AutoVacWorkerMain(), do_start_worker(), and relation_needs_vacanalyze().

TransactionId recentXid
static

Definition at line 146 of file autovacuum.c.

Referenced by AutoVacWorkerMain(), do_start_worker(), and relation_needs_vacanalyze().