PostgreSQL Source Code  git master
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/tableam.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 "nodes/makefuncs.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/fork_process.h"
#include "postmaster/interrupt.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/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 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 HandleAutoVacLauncherInterrupts (void)
 
static void AutoVacLauncherShutdown (void)
 
static void launcher_determine_sleep (bool canlaunch, bool recursing, struct timeval *nap)
 
static void rebuild_database_list (Oid newdb)
 
static int db_comparator (const void *a, const void *b)
 
static void launch_worker (TimestampTz now)
 
void AutoVacWorkerFailed (void)
 
static void avl_sigusr2_handler (SIGNAL_ARGS)
 
int StartAutoVacWorker (void)
 
static void FreeWorkerInfo (int code, Datum arg)
 
void AutoVacuumUpdateDelay (void)
 
static void autovac_balance_cost (void)
 
static Listget_database_list (void)
 
static void do_autovacuum (void)
 
static void perform_work_item (AutoVacuumWorkItem *workitem)
 
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 autovac_tabletable_recheck_autovac (Oid relid, HTAB *table_toast_map, TupleDesc pg_class_desc, int effective_multixact_freeze_max_age)
 
static void recheck_relation_needs_vacanalyze (Oid relid, AutoVacOpts *avopts, Form_pg_class classForm, int effective_multixact_freeze_max_age, bool *dovacuum, bool *doanalyze, bool *wraparound)
 
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 void autovac_report_activity (autovac_table *tab)
 
static void autovac_report_workitem (AutoVacuumWorkItem *workitem, const char *nspname, const char *relname)
 
bool AutoVacuumingActive (void)
 
bool AutoVacuumRequestWork (AutoVacuumWorkItemType type, Oid relationId, BlockNumber blkno)
 
void autovac_init (void)
 
bool IsAutoVacuumLauncherProcess (void)
 
bool IsAutoVacuumWorkerProcess (void)
 
Size AutoVacuumShmemSize (void)
 
void AutoVacuumShmemInit (void)
 
static void autovac_refresh_stats (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_vac_ins_thresh
 
double autovacuum_vac_ins_scale
 
int autovacuum_anl_thresh
 
double autovacuum_anl_scale
 
int autovacuum_freeze_max_age
 
int autovacuum_multixact_freeze_max_age
 
double 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_SIGUSR2 = 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

◆ MAX_AUTOVAC_ACTIV_LEN

#define MAX_AUTOVAC_ACTIV_LEN   (NAMEDATALEN * 2 + 56)

◆ MAX_AUTOVAC_SLEEPTIME

#define MAX_AUTOVAC_SLEEPTIME   300 /* seconds */

Definition at line 137 of file autovacuum.c.

Referenced by launcher_determine_sleep().

◆ MIN_AUTOVAC_SLEEPTIME

#define MIN_AUTOVAC_SLEEPTIME   100.0 /* milliseconds */

Definition at line 136 of file autovacuum.c.

Referenced by launcher_determine_sleep(), and rebuild_database_list().

◆ NUM_WORKITEMS

#define NUM_WORKITEMS   256

Definition at line 264 of file autovacuum.c.

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

◆ STATS_READ_DELAY

#define STATS_READ_DELAY   1000

Definition at line 133 of file autovacuum.c.

Referenced by autovac_refresh_stats().

Typedef Documentation

◆ autovac_table

typedef struct autovac_table autovac_table

◆ AutoVacuumWorkItem

◆ av_relation

typedef struct av_relation av_relation

◆ avl_dbase

typedef struct avl_dbase avl_dbase

◆ avw_dbase

typedef struct avw_dbase avw_dbase

◆ WorkerInfo

typedef struct WorkerInfoData* WorkerInfo

Definition at line 234 of file autovacuum.c.

◆ WorkerInfoData

Enumeration Type Documentation

◆ AutoVacuumSignal

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

◆ autovac_balance_cost()

static void autovac_balance_cost ( void  )
static

Definition at line 1799 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, 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(), do_autovacuum(), and HandleAutoVacLauncherInterrupts().

1800 {
1801  /*
1802  * The idea here is that we ration out I/O equally. The amount of I/O
1803  * that a worker can consume is determined by cost_limit/cost_delay, so we
1804  * try to equalize those ratios rather than the raw limit settings.
1805  *
1806  * note: in cost_limit, zero also means use value from elsewhere, because
1807  * zero is not a valid value.
1808  */
1809  int vac_cost_limit = (autovacuum_vac_cost_limit > 0 ?
1811  double vac_cost_delay = (autovacuum_vac_cost_delay >= 0 ?
1813  double cost_total;
1814  double cost_avail;
1815  dlist_iter iter;
1816 
1817  /* not set? nothing to do */
1818  if (vac_cost_limit <= 0 || vac_cost_delay <= 0)
1819  return;
1820 
1821  /* calculate the total base cost limit of participating active workers */
1822  cost_total = 0.0;
1824  {
1825  WorkerInfo worker = dlist_container(WorkerInfoData, wi_links, iter.cur);
1826 
1827  if (worker->wi_proc != NULL &&
1828  worker->wi_dobalance &&
1829  worker->wi_cost_limit_base > 0 && worker->wi_cost_delay > 0)
1830  cost_total +=
1831  (double) worker->wi_cost_limit_base / worker->wi_cost_delay;
1832  }
1833 
1834  /* there are no cost limits -- nothing to do */
1835  if (cost_total <= 0)
1836  return;
1837 
1838  /*
1839  * Adjust cost limit of each active worker to balance the total of cost
1840  * limit to autovacuum_vacuum_cost_limit.
1841  */
1842  cost_avail = (double) vac_cost_limit / vac_cost_delay;
1844  {
1845  WorkerInfo worker = dlist_container(WorkerInfoData, wi_links, iter.cur);
1846 
1847  if (worker->wi_proc != NULL &&
1848  worker->wi_dobalance &&
1849  worker->wi_cost_limit_base > 0 && worker->wi_cost_delay > 0)
1850  {
1851  int limit = (int)
1852  (cost_avail * worker->wi_cost_limit_base / cost_total);
1853 
1854  /*
1855  * We put a lower bound of 1 on the cost_limit, to avoid division-
1856  * by-zero in the vacuum code. Also, in case of roundoff trouble
1857  * in these calculations, let's be sure we don't ever set
1858  * cost_limit to more than the base value.
1859  */
1860  worker->wi_cost_limit = Max(Min(limit,
1861  worker->wi_cost_limit_base),
1862  1);
1863  }
1864 
1865  if (worker->wi_proc != NULL)
1866  elog(DEBUG2, "autovac_balance_cost(pid=%d db=%u, rel=%u, dobalance=%s cost_limit=%d, cost_limit_base=%d, cost_delay=%g)",
1867  worker->wi_proc->pid, worker->wi_dboid, worker->wi_tableoid,
1868  worker->wi_dobalance ? "yes" : "no",
1869  worker->wi_cost_limit, worker->wi_cost_limit_base,
1870  worker->wi_cost_delay);
1871  }
1872 }
#define dlist_foreach(iter, lhead)
Definition: ilist.h:526
double wi_cost_delay
Definition: autovacuum.c:229
#define Min(x, y)
Definition: c.h:986
int autovacuum_vac_cost_limit
Definition: autovacuum.c:128
#define dlist_container(type, membername, ptr)
Definition: ilist.h:496
int VacuumCostLimit
Definition: globals.c:144
#define DEBUG2
Definition: elog.h:24
double autovacuum_vac_cost_delay
Definition: autovacuum.c:127
int wi_cost_limit_base
Definition: autovacuum.c:231
dlist_node * cur
Definition: ilist.h:161
#define Max(x, y)
Definition: c.h:980
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
double VacuumCostDelay
Definition: globals.c:145
#define elog(elevel,...)
Definition: elog.h:232
PGPROC * wi_proc
Definition: autovacuum.c:225
dlist_head av_runningWorkers
Definition: autovacuum.c:287
int pid
Definition: proc.h:146

◆ autovac_init()

void autovac_init ( void  )

Definition at line 3390 of file autovacuum.c.

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

Referenced by PostmasterMain().

3391 {
3393  ereport(WARNING,
3394  (errmsg("autovacuum not started because of misconfiguration"),
3395  errhint("Enable the \"track_counts\" option.")));
3396 }
int errhint(const char *fmt,...)
Definition: elog.c:1156
bool autovacuum_start_daemon
Definition: autovacuum.c:114
bool pgstat_track_counts
Definition: pgstat.c:115
#define WARNING
Definition: elog.h:40
#define ereport(elevel,...)
Definition: elog.h:157
int errmsg(const char *fmt,...)
Definition: elog.c:909

◆ autovac_refresh_stats()

static void autovac_refresh_stats ( void  )
static

Definition at line 3488 of file autovacuum.c.

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

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

3489 {
3491  {
3492  static TimestampTz last_read = 0;
3493  TimestampTz current_time;
3494 
3495  current_time = GetCurrentTimestamp();
3496 
3497  if (!TimestampDifferenceExceeds(last_read, current_time,
3499  return;
3500 
3501  last_read = current_time;
3502  }
3503 
3505 }
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1580
int64 TimestampTz
Definition: timestamp.h:39
#define STATS_READ_DELAY
Definition: autovacuum.c:133
bool TimestampDifferenceExceeds(TimestampTz start_time, TimestampTz stop_time, int msec)
Definition: timestamp.c:1711
bool IsAutoVacuumLauncherProcess(void)
Definition: autovacuum.c:3404
void pgstat_clear_snapshot(void)
Definition: pgstat.c:4867

◆ autovac_report_activity()

static void autovac_report_activity ( autovac_table tab)
static

Definition at line 3261 of file autovacuum.c.

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

Referenced by autovacuum_do_vac_analyze().

3262 {
3263 #define MAX_AUTOVAC_ACTIV_LEN (NAMEDATALEN * 2 + 56)
3264  char activity[MAX_AUTOVAC_ACTIV_LEN];
3265  int len;
3266 
3267  /* Report the command and possible options */
3268  if (tab->at_params.options & VACOPT_VACUUM)
3269  snprintf(activity, MAX_AUTOVAC_ACTIV_LEN,
3270  "autovacuum: VACUUM%s",
3271  tab->at_params.options & VACOPT_ANALYZE ? " ANALYZE" : "");
3272  else
3273  snprintf(activity, MAX_AUTOVAC_ACTIV_LEN,
3274  "autovacuum: ANALYZE");
3275 
3276  /*
3277  * Report the qualified name of the relation.
3278  */
3279  len = strlen(activity);
3280 
3281  snprintf(activity + len, MAX_AUTOVAC_ACTIV_LEN - len,
3282  " %s.%s%s", tab->at_nspname, tab->at_relname,
3283  tab->at_params.is_wraparound ? " (to prevent wraparound)" : "");
3284 
3285  /* Set statement_timestamp() to current time for pg_stat_activity */
3287 
3289 }
#define VACOPT_ANALYZE
Definition: vacuum.h:179
char * at_relname
Definition: autovacuum.c:197
bits32 options
Definition: vacuum.h:211
bool is_wraparound
Definition: vacuum.h:218
char * at_nspname
Definition: autovacuum.c:198
#define MAX_AUTOVAC_ACTIV_LEN
VacuumParams at_params
Definition: autovacuum.c:192
#define VACOPT_VACUUM
Definition: vacuum.h:178
void SetCurrentStatementStartTimestamp(void)
Definition: xact.c:834
void pgstat_report_activity(BackendState state, const char *cmd_str)
#define snprintf
Definition: port.h:217

◆ autovac_report_workitem()

static void autovac_report_workitem ( AutoVacuumWorkItem workitem,
const char *  nspname,
const char *  relname 
)
static

Definition at line 3296 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().

3298 {
3299  char activity[MAX_AUTOVAC_ACTIV_LEN + 12 + 2];
3300  char blk[12 + 2];
3301  int len;
3302 
3303  switch (workitem->avw_type)
3304  {
3306  snprintf(activity, MAX_AUTOVAC_ACTIV_LEN,
3307  "autovacuum: BRIN summarize");
3308  break;
3309  }
3310 
3311  /*
3312  * Report the qualified name of the relation, and the block number if any
3313  */
3314  len = strlen(activity);
3315 
3316  if (BlockNumberIsValid(workitem->avw_blockNumber))
3317  snprintf(blk, sizeof(blk), " %u", workitem->avw_blockNumber);
3318  else
3319  blk[0] = '\0';
3320 
3321  snprintf(activity + len, MAX_AUTOVAC_ACTIV_LEN - len,
3322  " %s.%s%s", nspname, relname, blk);
3323 
3324  /* Set statement_timestamp() to current time for pg_stat_activity */
3326 
3328 }
AutoVacuumWorkItemType avw_type
Definition: autovacuum.c:256
NameData relname
Definition: pg_class.h:38
#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:834
void pgstat_report_activity(BackendState state, const char *cmd_str)
#define snprintf
Definition: port.h:217

◆ AutoVacLauncherMain()

NON_EXEC_STATIC void AutoVacLauncherMain ( int  argc,
char *  argv[] 
)

Definition at line 436 of file autovacuum.c.

References AbortBufferIO(), AbortCurrentTransaction(), avl_dbase::adl_next_worker, avl_dbase::adl_node, ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, am_autovacuum_launcher, AtEOXact_Buffers(), AtEOXact_Files(), AtEOXact_HashTables(), AtEOXact_SMgr(), autovac_balance_cost(), AutoVacForkFailed, AutoVacLauncherShutdown(), AutoVacRebalance, autovacuum_naptime, AutoVacuumingActive(), AuxProcessResourceOwner, AutoVacuumShmemStruct::av_freeWorkers, AutoVacuumShmemStruct::av_launcherpid, AutoVacuumShmemStruct::av_signal, AutoVacuumShmemStruct::av_startingWorker, avl_sigusr2_handler(), B_AUTOVAC_LAUNCHER, BaseInit(), DEBUG1, disable_all_timeouts(), dlist_init(), dlist_is_empty(), dlist_push_head(), dlist_tail_element, do_start_worker(), elog, EmitErrorReport(), ereport, errmsg_internal(), error_context_stack, FloatExceptionHandler(), FlushErrorState(), GetCurrentTimestamp(), got_SIGUSR2, HandleAutoVacLauncherInterrupts(), 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, MyBackendType, MyLatch, MyProcPid, NormalProcessing, PG_exception_stack, PG_SETMASK, pg_usleep(), PGC_S_OVERRIDE, PGC_SUSET, pgstat_clear_snapshot(), pgstat_report_wait_end(), PMSIGNAL_START_AUTOVAC_WORKER, PostAuthDelay, pqsignal(), proc_exit(), procsignal_sigusr1_handler(), QueryCancelPending, rebuild_database_list(), ReleaseAuxProcessResources(), ResetLatch(), RESUME_INTERRUPTS, SendPostmasterSignal(), SetConfigOption(), SetProcessingMode, ShutdownRequestPending, SIG_DFL, SIG_IGN, SIGCHLD, SIGHUP, SignalHandlerForConfigReload(), SignalHandlerForShutdownRequest(), SIGPIPE, SIGUSR1, SIGUSR2, StatementCancelHandler(), TimestampDifferenceExceeds(), TopMemoryContext, UnBlockSig, UnlockBuffers(), WAIT_EVENT_AUTOVACUUM_MAIN, WaitLatch(), WARNING, WorkerInfoData::wi_dboid, WorkerInfoData::wi_launchtime, WorkerInfoData::wi_links, WorkerInfoData::wi_proc, WorkerInfoData::wi_sharedrel, WorkerInfoData::wi_tableoid, WL_EXIT_ON_PM_DEATH, WL_LATCH_SET, and WL_TIMEOUT.

Referenced by BackendRun().

437 {
438  sigjmp_buf local_sigjmp_buf;
439 
440  am_autovacuum_launcher = true;
441 
443  init_ps_display(NULL);
444 
445  ereport(DEBUG1,
446  (errmsg_internal("autovacuum launcher started")));
447 
448  if (PostAuthDelay)
449  pg_usleep(PostAuthDelay * 1000000L);
450 
452 
453  /*
454  * Set up signal handlers. We operate on databases much like a regular
455  * backend, so we use the same signal handling. See equivalent code in
456  * tcop/postgres.c.
457  */
461  /* SIGQUIT handler was already set up by InitPostmasterChild */
462 
463  InitializeTimeouts(); /* establishes SIGALRM handler */
464 
470 
471  /*
472  * Create a per-backend PGPROC struct in shared memory, except in the
473  * EXEC_BACKEND case where this was done in SubPostmasterMain. We must do
474  * this before we can use LWLocks (and in the EXEC_BACKEND case we already
475  * had to do some stuff with LWLocks).
476  */
477 #ifndef EXEC_BACKEND
478  InitProcess();
479 #endif
480 
481  /* Early initialization */
482  BaseInit();
483 
484  InitPostgres(NULL, InvalidOid, NULL, InvalidOid, NULL, false);
485 
487 
488  /*
489  * Create a memory context that we will do all our work in. We do this so
490  * that we can reset the context during error recovery and thereby avoid
491  * possible memory leaks.
492  */
494  "Autovacuum Launcher",
497 
498  /*
499  * If an exception is encountered, processing resumes here.
500  *
501  * This code is a stripped down version of PostgresMain error recovery.
502  *
503  * Note that we use sigsetjmp(..., 1), so that the prevailing signal mask
504  * (to wit, BlockSig) will be restored when longjmp'ing to here. Thus,
505  * signals other than SIGQUIT will be blocked until we complete error
506  * recovery. It might seem that this policy makes the HOLD_INTERRUPTS()
507  * call redundant, but it is not since InterruptPending might be set
508  * already.
509  */
510  if (sigsetjmp(local_sigjmp_buf, 1) != 0)
511  {
512  /* since not using PG_TRY, must reset error stack by hand */
513  error_context_stack = NULL;
514 
515  /* Prevents interrupts while cleaning up */
516  HOLD_INTERRUPTS();
517 
518  /* Forget any pending QueryCancel or timeout request */
519  disable_all_timeouts(false);
520  QueryCancelPending = false; /* second to avoid race condition */
521 
522  /* Report the error to the server log */
523  EmitErrorReport();
524 
525  /* Abort the current transaction in order to recover */
527 
528  /*
529  * Release any other resources, for the case where we were not in a
530  * transaction.
531  */
534  AbortBufferIO();
535  UnlockBuffers();
536  /* this is probably dead code, but let's be safe: */
539  AtEOXact_Buffers(false);
540  AtEOXact_SMgr();
541  AtEOXact_Files(false);
542  AtEOXact_HashTables(false);
543 
544  /*
545  * Now return to normal top-level context and clear ErrorContext for
546  * next time.
547  */
549  FlushErrorState();
550 
551  /* Flush any leaked data in the top-level context */
553 
554  /* don't leave dangling pointers to freed memory */
555  DatabaseListCxt = NULL;
557 
558  /*
559  * Make sure pgstat also considers our stat data as gone. Note: we
560  * mustn't use autovac_refresh_stats here.
561  */
563 
564  /* Now we can allow interrupts again */
566 
567  /* if in shutdown mode, no need for anything further; just go away */
570 
571  /*
572  * Sleep at least 1 second after any error. We don't want to be
573  * filling the error logs as fast as we can.
574  */
575  pg_usleep(1000000L);
576  }
577 
578  /* We can now handle ereport(ERROR) */
579  PG_exception_stack = &local_sigjmp_buf;
580 
581  /* must unblock signals before calling rebuild_database_list */
583 
584  /*
585  * Set always-secure search path. Launcher doesn't connect to a database,
586  * so this has no effect.
587  */
588  SetConfigOption("search_path", "", PGC_SUSET, PGC_S_OVERRIDE);
589 
590  /*
591  * Force zero_damaged_pages OFF in the autovac process, even if it is set
592  * in postgresql.conf. We don't really want such a dangerous option being
593  * applied non-interactively.
594  */
595  SetConfigOption("zero_damaged_pages", "false", PGC_SUSET, PGC_S_OVERRIDE);
596 
597  /*
598  * Force settable timeouts off to avoid letting these settings prevent
599  * regular maintenance from being executed.
600  */
601  SetConfigOption("statement_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
602  SetConfigOption("lock_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
603  SetConfigOption("idle_in_transaction_session_timeout", "0",
605 
606  /*
607  * Force default_transaction_isolation to READ COMMITTED. We don't want
608  * to pay the overhead of serializable mode, nor add any risk of causing
609  * deadlocks or delaying other transactions.
610  */
611  SetConfigOption("default_transaction_isolation", "read committed",
613 
614  /*
615  * In emergency mode, just start a worker (unless shutdown was requested)
616  * and go away.
617  */
618  if (!AutoVacuumingActive())
619  {
621  do_start_worker();
622  proc_exit(0); /* done */
623  }
624 
626 
627  /*
628  * Create the initial database list. The invariant we want this list to
629  * keep is that it's ordered by decreasing next_time. As soon as an entry
630  * is updated to a higher time, it will be moved to the front (which is
631  * correct because the only operation is to add autovacuum_naptime to the
632  * entry, and time always increases).
633  */
635 
636  /* loop until shutdown request */
637  while (!ShutdownRequestPending)
638  {
639  struct timeval nap;
640  TimestampTz current_time = 0;
641  bool can_launch;
642 
643  /*
644  * This loop is a bit different from the normal use of WaitLatch,
645  * because we'd like to sleep before the first launch of a child
646  * process. So it's WaitLatch, then ResetLatch, then check for
647  * wakening conditions.
648  */
649 
651  false, &nap);
652 
653  /*
654  * Wait until naptime expires or we get some type of signal (all the
655  * signal handlers will wake us by calling SetLatch).
656  */
657  (void) WaitLatch(MyLatch,
659  (nap.tv_sec * 1000L) + (nap.tv_usec / 1000L),
661 
663 
665 
666  /*
667  * a worker finished, or postmaster signaled failure to start a worker
668  */
669  if (got_SIGUSR2)
670  {
671  got_SIGUSR2 = false;
672 
673  /* rebalance cost limits, if needed */
675  {
676  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
679  LWLockRelease(AutovacuumLock);
680  }
681 
683  {
684  /*
685  * If the postmaster failed to start a new worker, we sleep
686  * for a little while and resend the signal. The new worker's
687  * state is still in memory, so this is sufficient. After
688  * that, we restart the main loop.
689  *
690  * XXX should we put a limit to the number of times we retry?
691  * I don't think it makes much sense, because a future start
692  * of a worker will continue to fail in the same way.
693  */
695  pg_usleep(1000000L); /* 1s */
697  continue;
698  }
699  }
700 
701  /*
702  * There are some conditions that we need to check before trying to
703  * start a worker. First, we need to make sure that there is a worker
704  * slot available. Second, we need to make sure that no other worker
705  * failed while starting up.
706  */
707 
708  current_time = GetCurrentTimestamp();
709  LWLockAcquire(AutovacuumLock, LW_SHARED);
710 
712 
713  if (AutoVacuumShmem->av_startingWorker != NULL)
714  {
715  int waittime;
717 
718  /*
719  * We can't launch another worker when another one is still
720  * starting up (or failed while doing so), so just sleep for a bit
721  * more; that worker will wake us up again as soon as it's ready.
722  * We will only wait autovacuum_naptime seconds (up to a maximum
723  * of 60 seconds) for this to happen however. Note that failure
724  * to connect to a particular database is not a problem here,
725  * because the worker removes itself from the startingWorker
726  * pointer before trying to connect. Problems detected by the
727  * postmaster (like fork() failure) are also reported and handled
728  * differently. The only problems that may cause this code to
729  * fire are errors in the earlier sections of AutoVacWorkerMain,
730  * before the worker removes the WorkerInfo from the
731  * startingWorker pointer.
732  */
733  waittime = Min(autovacuum_naptime, 60) * 1000;
734  if (TimestampDifferenceExceeds(worker->wi_launchtime, current_time,
735  waittime))
736  {
737  LWLockRelease(AutovacuumLock);
738  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
739 
740  /*
741  * No other process can put a worker in starting mode, so if
742  * startingWorker is still INVALID after exchanging our lock,
743  * we assume it's the same one we saw above (so we don't
744  * recheck the launch time).
745  */
746  if (AutoVacuumShmem->av_startingWorker != NULL)
747  {
749  worker->wi_dboid = InvalidOid;
750  worker->wi_tableoid = InvalidOid;
751  worker->wi_sharedrel = false;
752  worker->wi_proc = NULL;
753  worker->wi_launchtime = 0;
755  &worker->wi_links);
757  elog(WARNING, "worker took too long to start; canceled");
758  }
759  }
760  else
761  can_launch = false;
762  }
763  LWLockRelease(AutovacuumLock); /* either shared or exclusive */
764 
765  /* if we can't do anything, just go back to sleep */
766  if (!can_launch)
767  continue;
768 
769  /* We're OK to start a new worker */
770 
772  {
773  /*
774  * Special case when the list is empty: start a worker right away.
775  * This covers the initial case, when no database is in pgstats
776  * (thus the list is empty). Note that the constraints in
777  * launcher_determine_sleep keep us from starting workers too
778  * quickly (at most once every autovacuum_naptime when the list is
779  * empty).
780  */
781  launch_worker(current_time);
782  }
783  else
784  {
785  /*
786  * because rebuild_database_list constructs a list with most
787  * distant adl_next_worker first, we obtain our database from the
788  * tail of the list.
789  */
790  avl_dbase *avdb;
791 
792  avdb = dlist_tail_element(avl_dbase, adl_node, &DatabaseList);
793 
794  /*
795  * launch a worker if next_worker is right now or it is in the
796  * past
797  */
799  current_time, 0))
800  launch_worker(current_time);
801  }
802  }
803 
805 }
void InitializeTimeouts(void)
Definition: timeout.c:435
int autovacuum_naptime
Definition: autovacuum.c:117
void AbortCurrentTransaction(void)
Definition: xact.c:3224
TimestampTz adl_next_worker
Definition: autovacuum.c:163
#define AllocSetContextCreate
Definition: memutils.h:173
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
#define DEBUG1
Definition: elog.h:25
int MyProcPid
Definition: globals.c:43
WorkerInfo av_startingWorker
Definition: autovacuum.c:288
static void autovac_balance_cost(void)
Definition: autovacuum.c:1799
static void pgstat_report_wait_end(void)
Definition: wait_event.h:274
sig_atomic_t av_signal[AutoVacNumSignals]
Definition: autovacuum.c:284
static bool am_autovacuum_launcher
Definition: autovacuum.c:140
#define WL_TIMEOUT
Definition: latch.h:128
dlist_head av_freeWorkers
Definition: autovacuum.c:286
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
#define SIGUSR1
Definition: win32_port.h:179
BackendType MyBackendType
Definition: miscinit.c:62
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1580
#define SIGCHLD
Definition: win32_port.h:177
int64 TimestampTz
Definition: timestamp.h:39
void AtEOXact_Buffers(bool isCommit)
Definition: bufmgr.c:2579
void SignalHandlerForConfigReload(SIGNAL_ARGS)
Definition: interrupt.c:56
void ReleaseAuxProcessResources(bool isCommit)
Definition: resowner.c:908
TimestampTz wi_launchtime
Definition: autovacuum.c:226
static MemoryContext AutovacMemCxt
Definition: autovacuum.c:157
#define Min(x, y)
Definition: c.h:986
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
void proc_exit(int code)
Definition: ipc.c:104
#define SetProcessingMode(mode)
Definition: miscadmin.h:412
void BaseInit(void)
Definition: postinit.c:511
dlist_node wi_links
Definition: autovacuum.c:222
#define SIGPIPE
Definition: win32_port.h:172
#define SIGUSR2
Definition: win32_port.h:180
bool TimestampDifferenceExceeds(TimestampTz start_time, TimestampTz stop_time, int msec)
Definition: timestamp.c:1711
void FlushErrorState(void)
Definition: elog.c:1654
void ResetLatch(Latch *latch)
Definition: latch.c:660
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
ResourceOwner AuxProcessResourceOwner
Definition: resowner.c:149
void StatementCancelHandler(SIGNAL_ARGS)
Definition: postgres.c:2949
void AtEOXact_Files(bool isCommit)
Definition: fd.c:3041
int WaitLatch(Latch *latch, int wakeEvents, long timeout, uint32 wait_event_info)
Definition: latch.c:452
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:133
ErrorContextCallback * error_context_stack
Definition: elog.c:93
void pg_usleep(long microsec)
Definition: signal.c:53
static void HandleAutoVacLauncherInterrupts(void)
Definition: autovacuum.c:811
void AtEOXact_SMgr(void)
Definition: smgr.c:678
#define dlist_tail_element(type, membername, lhead)
Definition: ilist.h:515
void disable_all_timeouts(bool keep_indicators)
Definition: timeout.c:687
bool AutoVacuumingActive(void)
Definition: autovacuum.c:3336
Definition: guc.h:75
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:195
void InitProcess(void)
Definition: proc.c:303
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:8110
#define SIGHUP
Definition: win32_port.h:167
sigset_t UnBlockSig
Definition: pqsignal.c:22
static dlist_head DatabaseList
Definition: autovacuum.c:298
MemoryContext TopMemoryContext
Definition: mcxt.c:48
volatile sig_atomic_t ShutdownRequestPending
Definition: interrupt.c:27
void SignalHandlerForShutdownRequest(SIGNAL_ARGS)
Definition: interrupt.c:104
static void avl_sigusr2_handler(SIGNAL_ARGS)
Definition: autovacuum.c:1427
#define SIG_IGN
Definition: win32_port.h:164
static void launcher_determine_sleep(bool canlaunch, bool recursing, struct timeval *nap)
Definition: autovacuum.c:868
#define WARNING
Definition: elog.h:40
void UnlockBuffers(void)
Definition: bufmgr.c:3979
#define MemoryContextResetAndDeleteChildren(ctx)
Definition: memutils.h:67
int PostAuthDelay
Definition: postgres.c:103
void EmitErrorReport(void)
Definition: elog.c:1509
#define InvalidOid
Definition: postgres_ext.h:36
static void dlist_init(dlist_head *head)
Definition: ilist.h:278
#define ereport(elevel,...)
Definition: elog.h:157
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname, bool override_allow_connections)
Definition: postinit.c:572
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:170
static volatile sig_atomic_t got_SIGUSR2
Definition: autovacuum.c:144
int errmsg_internal(const char *fmt,...)
Definition: elog.c:996
#define SIG_DFL
Definition: win32_port.h:162
static bool dlist_is_empty(dlist_head *head)
Definition: ilist.h:289
void pgstat_clear_snapshot(void)
Definition: pgstat.c:4867
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
void AbortBufferIO(void)
Definition: bufmgr.c:4477
sigjmp_buf * PG_exception_stack
Definition: elog.c:95
static void rebuild_database_list(Oid newdb)
Definition: autovacuum.c:952
static void AutoVacLauncherShutdown(void)
Definition: autovacuum.c:316
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:131
#define elog(elevel,...)
Definition: elog.h:232
static MemoryContext DatabaseListCxt
Definition: autovacuum.c:299
void FloatExceptionHandler(SIGNAL_ARGS)
Definition: postgres.c:2970
struct Latch * MyLatch
Definition: globals.c:57
PGPROC * wi_proc
Definition: autovacuum.c:225
static void launch_worker(TimestampTz now)
Definition: autovacuum.c:1368
void SendPostmasterSignal(PMSignalReason reason)
Definition: pmsignal.c:153
void init_ps_display(const char *fixed_part)
Definition: ps_status.c:258
void LWLockReleaseAll(void)
Definition: lwlock.c:1902
void procsignal_sigusr1_handler(SIGNAL_ARGS)
Definition: procsignal.c:642
void AtEOXact_HashTables(bool isCommit)
Definition: dynahash.c:1883
#define WL_LATCH_SET
Definition: latch.h:125
static Oid do_start_worker(void)
Definition: autovacuum.c:1153
#define WL_EXIT_ON_PM_DEATH
Definition: latch.h:130

◆ AutoVacLauncherShutdown()

static void AutoVacLauncherShutdown ( void  )
static

Definition at line 316 of file autovacuum.c.

Referenced by AutoVacLauncherMain(), and HandleAutoVacLauncherInterrupts().

369 {
370  char *av[10];
371  int ac = 0;
372 
373  av[ac++] = "postgres";
374  av[ac++] = "--forkavlauncher";
375  av[ac++] = NULL; /* filled in by postmaster_forkexec */
376  av[ac] = NULL;
377 
378  Assert(ac < lengthof(av));
379 
380  return postmaster_forkexec(ac, av);
381 }
382 
383 /*
384  * We need this set from the outside, before InitProcess is called
385  */
386 void
387 AutovacuumLauncherIAm(void)
388 {
389  am_autovacuum_launcher = true;
390 }
391 #endif
392 
393 /*
394  * Main entry point for autovacuum launcher process, to be called from the
395  * postmaster.
396  */
397 int
399 {
400  pid_t AutoVacPID;
401 
402 #ifdef EXEC_BACKEND
403  switch ((AutoVacPID = avlauncher_forkexec()))
404 #else
405  switch ((AutoVacPID = fork_process()))
406 #endif
407  {
408  case -1:
409  ereport(LOG,
410  (errmsg("could not fork autovacuum launcher process: %m")));
411  return 0;
412 
413 #ifndef EXEC_BACKEND
414  case 0:
415  /* in postmaster child ... */
417 
418  /* Close the postmaster's sockets */
419  ClosePostmasterPorts(false);
420 
421  AutoVacLauncherMain(0, NULL);
422  break;
423 #endif
424  default:
425  return (int) AutoVacPID;
426  }
427 
428  /* shouldn't get here */
429  return 0;
430 }
static bool am_autovacuum_launcher
Definition: autovacuum.c:140
void InitPostmasterChild(void)
Definition: miscinit.c:94
NON_EXEC_STATIC void AutoVacLauncherMain(int argc, char *argv[]) pg_attribute_noreturn()
Definition: autovacuum.c:436
pid_t fork_process(void)
Definition: fork_process.c:29
struct @11::@12 av[32]
#define lengthof(array)
Definition: c.h:734
#define LOG
Definition: elog.h:26
void ClosePostmasterPorts(bool am_syslogger)
Definition: postmaster.c:2612
#define ereport(elevel,...)
Definition: elog.h:157
#define Assert(condition)
Definition: c.h:804
int StartAutoVacLauncher(void)
static pid_t AutoVacPID
Definition: postmaster.c:254
int errmsg(const char *fmt,...)
Definition: elog.c:909

◆ autovacuum_do_vac_analyze()

static void autovacuum_do_vac_analyze ( autovac_table tab,
BufferAccessStrategy  bstrategy 
)
static

Definition at line 3232 of file autovacuum.c.

References autovac_table::at_nspname, autovac_table::at_params, autovac_table::at_relid, autovac_table::at_relname, autovac_report_activity(), list_make1, makeRangeVar(), makeVacuumRelation(), NIL, and vacuum().

Referenced by do_autovacuum().

3233 {
3234  RangeVar *rangevar;
3235  VacuumRelation *rel;
3236  List *rel_list;
3237 
3238  /* Let pgstat know what we're doing */
3240 
3241  /* Set up one VacuumRelation target, identified by OID, for vacuum() */
3242  rangevar = makeRangeVar(tab->at_nspname, tab->at_relname, -1);
3243  rel = makeVacuumRelation(rangevar, tab->at_relid, NIL);
3244  rel_list = list_make1(rel);
3245 
3246  vacuum(rel_list, &tab->at_params, bstrategy, true);
3247 }
#define NIL
Definition: pg_list.h:65
void vacuum(List *relations, VacuumParams *params, BufferAccessStrategy bstrategy, bool isTopLevel)
Definition: vacuum.c:291
VacuumRelation * makeVacuumRelation(RangeVar *relation, Oid oid, List *va_cols)
Definition: makefuncs.c:809
#define list_make1(x1)
Definition: pg_list.h:206
char * at_relname
Definition: autovacuum.c:197
static void autovac_report_activity(autovac_table *tab)
Definition: autovacuum.c:3261
char * at_nspname
Definition: autovacuum.c:198
VacuumParams at_params
Definition: autovacuum.c:192
Definition: pg_list.h:50
RangeVar * makeRangeVar(char *schemaname, char *relname, int location)
Definition: makefuncs.c:422

◆ AutoVacuumingActive()

bool AutoVacuumingActive ( void  )

Definition at line 3336 of file autovacuum.c.

References autovacuum_start_daemon, and pgstat_track_counts.

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

3337 {
3339  return false;
3340  return true;
3341 }
bool autovacuum_start_daemon
Definition: autovacuum.c:114
bool pgstat_track_counts
Definition: pgstat.c:115

◆ AutoVacuumRequestWork()

bool AutoVacuumRequestWork ( AutoVacuumWorkItemType  type,
Oid  relationId,
BlockNumber  blkno 
)

Definition at line 3348 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, NUM_WORKITEMS, and generate_unaccent_rules::type.

Referenced by brininsert().

3350 {
3351  int i;
3352  bool result = false;
3353 
3354  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
3355 
3356  /*
3357  * Locate an unused work item and fill it with the given data.
3358  */
3359  for (i = 0; i < NUM_WORKITEMS; i++)
3360  {
3362 
3363  if (workitem->avw_used)
3364  continue;
3365 
3366  workitem->avw_used = true;
3367  workitem->avw_active = false;
3368  workitem->avw_type = type;
3369  workitem->avw_database = MyDatabaseId;
3370  workitem->avw_relation = relationId;
3371  workitem->avw_blockNumber = blkno;
3372  result = true;
3373 
3374  /* done */
3375  break;
3376  }
3377 
3378  LWLockRelease(AutovacuumLock);
3379 
3380  return result;
3381 }
AutoVacuumWorkItemType avw_type
Definition: autovacuum.c:256
#define NUM_WORKITEMS
Definition: autovacuum.c:264
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
AutoVacuumWorkItem av_workItems[NUM_WORKITEMS]
Definition: autovacuum.c:289
Oid MyDatabaseId
Definition: globals.c:88
BlockNumber avw_blockNumber
Definition: autovacuum.c:261
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
int i

◆ AutoVacuumShmemInit()

void AutoVacuumShmemInit ( void  )

Definition at line 3440 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, NUM_WORKITEMS, ShmemInitStruct(), and WorkerInfoData::wi_links.

Referenced by CreateSharedMemoryAndSemaphores().

3441 {
3442  bool found;
3443 
3445  ShmemInitStruct("AutoVacuum Data",
3447  &found);
3448 
3449  if (!IsUnderPostmaster)
3450  {
3451  WorkerInfo worker;
3452  int i;
3453 
3454  Assert(!found);
3455 
3460  memset(AutoVacuumShmem->av_workItems, 0,
3461  sizeof(AutoVacuumWorkItem) * NUM_WORKITEMS);
3462 
3463  worker = (WorkerInfo) ((char *) AutoVacuumShmem +
3464  MAXALIGN(sizeof(AutoVacuumShmemStruct)));
3465 
3466  /* initialize the WorkerInfo free list */
3467  for (i = 0; i < autovacuum_max_workers; i++)
3469  &worker[i].wi_links);
3470  }
3471  else
3472  Assert(found);
3473 }
#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:396
AutoVacuumWorkItem av_workItems[NUM_WORKITEMS]
Definition: autovacuum.c:289
bool IsUnderPostmaster
Definition: globals.c:112
Size AutoVacuumShmemSize(void)
Definition: autovacuum.c:3421
int autovacuum_max_workers
Definition: autovacuum.c:115
static void dlist_init(dlist_head *head)
Definition: ilist.h:278
#define Assert(condition)
Definition: c.h:804
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
#define MAXALIGN(LEN)
Definition: c.h:757
int i
dlist_head av_runningWorkers
Definition: autovacuum.c:287

◆ AutoVacuumShmemSize()

Size AutoVacuumShmemSize ( void  )

Definition at line 3421 of file autovacuum.c.

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

Referenced by AutoVacuumShmemInit(), and CalculateShmemSize().

3422 {
3423  Size size;
3424 
3425  /*
3426  * Need the fixed struct and the array of WorkerInfoData.
3427  */
3428  size = sizeof(AutoVacuumShmemStruct);
3429  size = MAXALIGN(size);
3431  sizeof(WorkerInfoData)));
3432  return size;
3433 }
Size mul_size(Size s1, Size s2)
Definition: shmem.c:519
Size add_size(Size s1, Size s2)
Definition: shmem.c:502
int autovacuum_max_workers
Definition: autovacuum.c:115
size_t Size
Definition: c.h:540
#define MAXALIGN(LEN)
Definition: c.h:757

◆ AutoVacuumUpdateDelay()

void AutoVacuumUpdateDelay ( void  )

Definition at line 1783 of file autovacuum.c.

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

Referenced by do_autovacuum(), and vacuum_delay_point().

1784 {
1785  if (MyWorkerInfo)
1786  {
1789  }
1790 }
double wi_cost_delay
Definition: autovacuum.c:229
int VacuumCostLimit
Definition: globals.c:144
static WorkerInfo MyWorkerInfo
Definition: autovacuum.c:302
double VacuumCostDelay
Definition: globals.c:145

◆ AutoVacWorkerFailed()

void AutoVacWorkerFailed ( void  )

Definition at line 1420 of file autovacuum.c.

References AutoVacForkFailed, and AutoVacuumShmemStruct::av_signal.

Referenced by StartAutovacuumWorker().

1421 {
1423 }
sig_atomic_t av_signal[AutoVacNumSignals]
Definition: autovacuum.c:284
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292

◆ AutoVacWorkerMain()

NON_EXEC_STATIC void AutoVacWorkerMain ( int  argc,
char *  argv[] 
)

Definition at line 1518 of file autovacuum.c.

References am_autovacuum_worker, AutoVacuumShmemStruct::av_launcherpid, AutoVacuumShmemStruct::av_runningWorkers, AutoVacuumShmemStruct::av_startingWorker, B_AUTOVAC_WORKER, BaseInit(), dbname, DEBUG1, die, dlist_push_head(), do_autovacuum(), elog, EmitErrorReport(), ereport, errmsg_internal(), error_context_stack, FloatExceptionHandler(), FreeWorkerInfo(), HOLD_INTERRUPTS, init_ps_display(), InitializeTimeouts(), InitPostgres(), InitProcess(), InitProcessing, InvalidOid, kill, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), MyBackendType, MyProc, NAMEDATALEN, NormalProcessing, 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(), ReadNextMultiXactId(), ReadNextTransactionId(), recentMulti, recentXid, set_ps_display(), SetConfigOption(), SetProcessingMode, SIG_DFL, SIG_IGN, SIGCHLD, SIGHUP, SignalHandlerForConfigReload(), SIGPIPE, SIGUSR1, SIGUSR2, StatementCancelHandler(), synchronous_commit, SYNCHRONOUS_COMMIT_LOCAL_FLUSH, UnBlockSig, WARNING, WorkerInfoData::wi_dboid, WorkerInfoData::wi_links, and WorkerInfoData::wi_proc.

Referenced by BackendRun(), and StartAutoVacWorker().

1519 {
1520  sigjmp_buf local_sigjmp_buf;
1521  Oid dbid;
1522 
1523  am_autovacuum_worker = true;
1524 
1526  init_ps_display(NULL);
1527 
1529 
1530  /*
1531  * Set up signal handlers. We operate on databases much like a regular
1532  * backend, so we use the same signal handling. See equivalent code in
1533  * tcop/postgres.c.
1534  */
1536 
1537  /*
1538  * SIGINT is used to signal canceling the current table's vacuum; SIGTERM
1539  * means abort and exit cleanly, and SIGQUIT means abandon ship.
1540  */
1542  pqsignal(SIGTERM, die);
1543  /* SIGQUIT handler was already set up by InitPostmasterChild */
1544 
1545  InitializeTimeouts(); /* establishes SIGALRM handler */
1546 
1552 
1553  /*
1554  * Create a per-backend PGPROC struct in shared memory, except in the
1555  * EXEC_BACKEND case where this was done in SubPostmasterMain. We must do
1556  * this before we can use LWLocks (and in the EXEC_BACKEND case we already
1557  * had to do some stuff with LWLocks).
1558  */
1559 #ifndef EXEC_BACKEND
1560  InitProcess();
1561 #endif
1562 
1563  /* Early initialization */
1564  BaseInit();
1565 
1566  /*
1567  * If an exception is encountered, processing resumes here.
1568  *
1569  * Unlike most auxiliary processes, we don't attempt to continue
1570  * processing after an error; we just clean up and exit. The autovac
1571  * launcher is responsible for spawning another worker later.
1572  *
1573  * Note that we use sigsetjmp(..., 1), so that the prevailing signal mask
1574  * (to wit, BlockSig) will be restored when longjmp'ing to here. Thus,
1575  * signals other than SIGQUIT will be blocked until we exit. It might
1576  * seem that this policy makes the HOLD_INTERRUPTS() call redundant, but
1577  * it is not since InterruptPending might be set already.
1578  */
1579  if (sigsetjmp(local_sigjmp_buf, 1) != 0)
1580  {
1581  /* since not using PG_TRY, must reset error stack by hand */
1582  error_context_stack = NULL;
1583 
1584  /* Prevents interrupts while cleaning up */
1585  HOLD_INTERRUPTS();
1586 
1587  /* Report the error to the server log */
1588  EmitErrorReport();
1589 
1590  /*
1591  * We can now go away. Note that because we called InitProcess, a
1592  * callback was registered to do ProcKill, which will clean up
1593  * necessary state.
1594  */
1595  proc_exit(0);
1596  }
1597 
1598  /* We can now handle ereport(ERROR) */
1599  PG_exception_stack = &local_sigjmp_buf;
1600 
1602 
1603  /*
1604  * Set always-secure search path, so malicious users can't redirect user
1605  * code (e.g. pg_index.indexprs). (That code runs in a
1606  * SECURITY_RESTRICTED_OPERATION sandbox, so malicious users could not
1607  * take control of the entire autovacuum worker in any case.)
1608  */
1609  SetConfigOption("search_path", "", PGC_SUSET, PGC_S_OVERRIDE);
1610 
1611  /*
1612  * Force zero_damaged_pages OFF in the autovac process, even if it is set
1613  * in postgresql.conf. We don't really want such a dangerous option being
1614  * applied non-interactively.
1615  */
1616  SetConfigOption("zero_damaged_pages", "false", PGC_SUSET, PGC_S_OVERRIDE);
1617 
1618  /*
1619  * Force settable timeouts off to avoid letting these settings prevent
1620  * regular maintenance from being executed.
1621  */
1622  SetConfigOption("statement_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
1623  SetConfigOption("lock_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
1624  SetConfigOption("idle_in_transaction_session_timeout", "0",
1626 
1627  /*
1628  * Force default_transaction_isolation to READ COMMITTED. We don't want
1629  * to pay the overhead of serializable mode, nor add any risk of causing
1630  * deadlocks or delaying other transactions.
1631  */
1632  SetConfigOption("default_transaction_isolation", "read committed",
1634 
1635  /*
1636  * Force synchronous replication off to allow regular maintenance even if
1637  * we are waiting for standbys to connect. This is important to ensure we
1638  * aren't blocked from performing anti-wraparound tasks.
1639  */
1641  SetConfigOption("synchronous_commit", "local",
1643 
1644  /*
1645  * Get the info about the database we're going to work on.
1646  */
1647  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
1648 
1649  /*
1650  * beware of startingWorker being INVALID; this should normally not
1651  * happen, but if a worker fails after forking and before this, the
1652  * launcher might have decided to remove it from the queue and start
1653  * again.
1654  */
1655  if (AutoVacuumShmem->av_startingWorker != NULL)
1656  {
1658  dbid = MyWorkerInfo->wi_dboid;
1660 
1661  /* insert into the running list */
1664 
1665  /*
1666  * remove from the "starting" pointer, so that the launcher can start
1667  * a new worker if required
1668  */
1670  LWLockRelease(AutovacuumLock);
1671 
1673 
1674  /* wake up the launcher */
1675  if (AutoVacuumShmem->av_launcherpid != 0)
1677  }
1678  else
1679  {
1680  /* no worker entry for me, go away */
1681  elog(WARNING, "autovacuum worker started without a worker entry");
1682  dbid = InvalidOid;
1683  LWLockRelease(AutovacuumLock);
1684  }
1685 
1686  if (OidIsValid(dbid))
1687  {
1688  char dbname[NAMEDATALEN];
1689 
1690  /*
1691  * Report autovac startup to the stats collector. We deliberately do
1692  * this before InitPostgres, so that the last_autovac_time will get
1693  * updated even if the connection attempt fails. This is to prevent
1694  * autovac from getting "stuck" repeatedly selecting an unopenable
1695  * database, rather than making any progress on stuff it can connect
1696  * to.
1697  */
1698  pgstat_report_autovac(dbid);
1699 
1700  /*
1701  * Connect to the selected database
1702  *
1703  * Note: if we have selected a just-deleted database (due to using
1704  * stale stats info), we'll fail and exit here.
1705  */
1706  InitPostgres(NULL, dbid, NULL, InvalidOid, dbname, false);
1708  set_ps_display(dbname);
1709  ereport(DEBUG1,
1710  (errmsg_internal("autovacuum: processing database \"%s\"", dbname)));
1711 
1712  if (PostAuthDelay)
1713  pg_usleep(PostAuthDelay * 1000000L);
1714 
1715  /* And do an appropriate amount of work */
1718  do_autovacuum();
1719  }
1720 
1721  /*
1722  * The launcher will be notified of my death in ProcKill, *if* we managed
1723  * to get a worker slot at all
1724  */
1725 
1726  /* All done, go away */
1727  proc_exit(0);
1728 }
static bool am_autovacuum_worker
Definition: autovacuum.c:141
void InitializeTimeouts(void)
Definition: timeout.c:435
#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
#define SIGUSR1
Definition: win32_port.h:179
BackendType MyBackendType
Definition: miscinit.c:62
static void do_autovacuum(void)
Definition: autovacuum.c:1957
#define SIGCHLD
Definition: win32_port.h:177
PGPROC * MyProc
Definition: proc.c:68
void SignalHandlerForConfigReload(SIGNAL_ARGS)
Definition: interrupt.c:56
static MultiXactId recentMulti
Definition: autovacuum.c:148
void proc_exit(int code)
Definition: ipc.c:104
#define SetProcessingMode(mode)
Definition: miscadmin.h:412
#define kill(pid, sig)
Definition: win32_port.h:464
void BaseInit(void)
Definition: postinit.c:511
dlist_node wi_links
Definition: autovacuum.c:222
#define SIGPIPE
Definition: win32_port.h:172
#define SIGUSR2
Definition: win32_port.h:180
static TransactionId ReadNextTransactionId(void)
Definition: transam.h:316
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:710
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
void StatementCancelHandler(SIGNAL_ARGS)
Definition: postgres.c:2949
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
ErrorContextCallback * error_context_stack
Definition: elog.c:93
#define NAMEDATALEN
void set_ps_display(const char *activity)
Definition: ps_status.c:349
void pg_usleep(long microsec)
Definition: signal.c:53
Definition: guc.h:75
void InitProcess(void)
Definition: proc.c:303
void on_shmem_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:361
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:8110
#define SIGHUP
Definition: win32_port.h:167
sigset_t UnBlockSig
Definition: pqsignal.c:22
static WorkerInfo MyWorkerInfo
Definition: autovacuum.c:302
int synchronous_commit
Definition: xact.c:84
#define SIG_IGN
Definition: win32_port.h:164
#define WARNING
Definition: elog.h:40
int PostAuthDelay
Definition: postgres.c:103
static TransactionId recentXid
Definition: autovacuum.c:147
void EmitErrorReport(void)
Definition: elog.c:1509
#define InvalidOid
Definition: postgres_ext.h:36
#define ereport(elevel,...)
Definition: elog.h:157
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname, bool override_allow_connections)
Definition: postinit.c:572
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:170
int errmsg_internal(const char *fmt,...)
Definition: elog.c:996
#define SIG_DFL
Definition: win32_port.h:162
char * dbname
Definition: streamutil.c:51
static void FreeWorkerInfo(int code, Datum arg)
Definition: autovacuum.c:1734
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
sigjmp_buf * PG_exception_stack
Definition: elog.c:95
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:131
#define elog(elevel,...)
Definition: elog.h:232
void FloatExceptionHandler(SIGNAL_ARGS)
Definition: postgres.c:2970
PGPROC * wi_proc
Definition: autovacuum.c:225
void init_ps_display(const char *fixed_part)
Definition: ps_status.c:258
void procsignal_sigusr1_handler(SIGNAL_ARGS)
Definition: procsignal.c:642
dlist_head av_runningWorkers
Definition: autovacuum.c:287
void pgstat_report_autovac(Oid dboid)
Definition: pgstat.c:1556
#define die(msg)
Definition: pg_test_fsync.c:97
MultiXactId ReadNextMultiXactId(void)
Definition: multixact.c:723

◆ avl_sigusr2_handler()

static void avl_sigusr2_handler ( SIGNAL_ARGS  )
static

Definition at line 1427 of file autovacuum.c.

References am_autovacuum_worker, Assert, got_SIGUSR2, lengthof, MyLatch, and SetLatch().

Referenced by AutoVacLauncherMain().

1428 {
1429  int save_errno = errno;
1430 
1431  got_SIGUSR2 = true;
1432  SetLatch(MyLatch);
1433 
1434  errno = save_errno;
1435 }
void SetLatch(Latch *latch)
Definition: latch.c:567
static volatile sig_atomic_t got_SIGUSR2
Definition: autovacuum.c:144
struct Latch * MyLatch
Definition: globals.c:57

◆ db_comparator()

static int db_comparator ( const void *  a,
const void *  b 
)
static

Definition at line 1133 of file autovacuum.c.

References avl_dbase::adl_score.

Referenced by rebuild_database_list().

1134 {
1135  if (((const avl_dbase *) a)->adl_score == ((const avl_dbase *) b)->adl_score)
1136  return 0;
1137  else
1138  return (((const avl_dbase *) a)->adl_score < ((const avl_dbase *) b)->adl_score) ? 1 : -1;
1139 }

◆ do_autovacuum()

static void do_autovacuum ( void  )
static

Definition at line 1957 of file autovacuum.c.

References AbortOutOfAnyTransaction(), AccessExclusiveLock, AccessShareLock, ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, 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_params, autovac_table::at_relid, autovac_table::at_relname, 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_database, AutoVacuumWorkItem::avw_used, BAS_VACUUM, BTEqualStrategyNumber, CharGetDatum, CHECK_FOR_INTERRUPTS, checkTempNamespaceStatus(), CommitTransactionCommand(), ConditionalLockRelationOid(), ConfigReloadPending, 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, HASH_BLOBS, hash_create(), HASH_ELEM, HASH_ENTER, HASH_FIND, hash_search(), heap_getnext(), HeapTupleIsValid, HOLD_INTERRUPTS, i, InvalidOid, sort-test::key, HASHCTL::keysize, lappend_oid(), lfirst_oid, LOG, LW_EXCLUSIVE, LW_SHARED, LWLockAcquire(), LWLockRelease(), MemoryContextResetAndDeleteChildren, MemoryContextSwitchTo(), MultiXactMemberFreezeThreshold(), MyDatabaseId, NameStr, NIL, NUM_WORKITEMS, ObjectIdGetDatum, OidIsValid, VacuumParams::options, 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, ReleaseSysCache(), RELOID, RESUME_INTERRUPTS, ScanKeyInit(), SearchSysCache1(), SearchSysCacheCopy1, StartTransactionCommand(), table_beginscan_catalog(), table_close(), table_endscan(), table_open(), table_recheck_autovac(), TEMP_NAMESPACE_IDLE, TopMemoryContext, 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().

1958 {
1959  Relation classRel;
1960  HeapTuple tuple;
1961  TableScanDesc relScan;
1962  Form_pg_database dbForm;
1963  List *table_oids = NIL;
1964  List *orphan_oids = NIL;
1965  HASHCTL ctl;
1966  HTAB *table_toast_map;
1967  ListCell *volatile cell;
1968  PgStat_StatDBEntry *shared;
1969  PgStat_StatDBEntry *dbentry;
1970  BufferAccessStrategy bstrategy;
1971  ScanKeyData key;
1972  TupleDesc pg_class_desc;
1973  int effective_multixact_freeze_max_age;
1974  bool did_vacuum = false;
1975  bool found_concurrent_worker = false;
1976  int i;
1977 
1978  /*
1979  * StartTransactionCommand and CommitTransactionCommand will automatically
1980  * switch to other contexts. We need this one to keep the list of
1981  * relations to vacuum/analyze across transactions.
1982  */
1984  "AV worker",
1987 
1988  /*
1989  * may be NULL if we couldn't find an entry (only happens if we are
1990  * forcing a vacuum for anti-wrap purposes).
1991  */
1993 
1994  /* Start a transaction so our commands have one to play into. */
1996 
1997  /*
1998  * Clean up any dead statistics collector entries for this DB. We always
1999  * want to do this exactly once per DB-processing cycle, even if we find
2000  * nothing worth vacuuming in the database.
2001  */
2003 
2004  /*
2005  * Compute the multixact age for which freezing is urgent. This is
2006  * normally autovacuum_multixact_freeze_max_age, but may be less if we are
2007  * short of multixact member space.
2008  */
2009  effective_multixact_freeze_max_age = MultiXactMemberFreezeThreshold();
2010 
2011  /*
2012  * Find the pg_database entry and select the default freeze ages. We use
2013  * zero in template and nonconnectable databases, else the system-wide
2014  * default.
2015  */
2017  if (!HeapTupleIsValid(tuple))
2018  elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
2019  dbForm = (Form_pg_database) GETSTRUCT(tuple);
2020 
2021  if (dbForm->datistemplate || !dbForm->datallowconn)
2022  {
2027  }
2028  else
2029  {
2034  }
2035 
2036  ReleaseSysCache(tuple);
2037 
2038  /* StartTransactionCommand changed elsewhere */
2040 
2041  /* The database hash where pgstat keeps shared relations */
2043 
2044  classRel = table_open(RelationRelationId, AccessShareLock);
2045 
2046  /* create a copy so we can use it after closing pg_class */
2047  pg_class_desc = CreateTupleDescCopy(RelationGetDescr(classRel));
2048 
2049  /* create hash table for toast <-> main relid mapping */
2050  ctl.keysize = sizeof(Oid);
2051  ctl.entrysize = sizeof(av_relation);
2052 
2053  table_toast_map = hash_create("TOAST to main relid map",
2054  100,
2055  &ctl,
2056  HASH_ELEM | HASH_BLOBS);
2057 
2058  /*
2059  * Scan pg_class to determine which tables to vacuum.
2060  *
2061  * We do this in two passes: on the first one we collect the list of plain
2062  * relations and materialized views, and on the second one we collect
2063  * TOAST tables. The reason for doing the second pass is that during it we
2064  * want to use the main relation's pg_class.reloptions entry if the TOAST
2065  * table does not have any, and we cannot obtain it unless we know
2066  * beforehand what's the main table OID.
2067  *
2068  * We need to check TOAST tables separately because in cases with short,
2069  * wide tables there might be proportionally much more activity in the
2070  * TOAST table than in its parent.
2071  */
2072  relScan = table_beginscan_catalog(classRel, 0, NULL);
2073 
2074  /*
2075  * On the first pass, we collect main tables to vacuum, and also the main
2076  * table relid to TOAST relid mapping.
2077  */
2078  while ((tuple = heap_getnext(relScan, ForwardScanDirection)) != NULL)
2079  {
2080  Form_pg_class classForm = (Form_pg_class) GETSTRUCT(tuple);
2081  PgStat_StatTabEntry *tabentry;
2082  AutoVacOpts *relopts;
2083  Oid relid;
2084  bool dovacuum;
2085  bool doanalyze;
2086  bool wraparound;
2087 
2088  if (classForm->relkind != RELKIND_RELATION &&
2089  classForm->relkind != RELKIND_MATVIEW)
2090  continue;
2091 
2092  relid = classForm->oid;
2093 
2094  /*
2095  * Check if it is a temp table (presumably, of some other backend's).
2096  * We cannot safely process other backends' temp tables.
2097  */
2098  if (classForm->relpersistence == RELPERSISTENCE_TEMP)
2099  {
2100  /*
2101  * We just ignore it if the owning backend is still active and
2102  * using the temporary schema. Also, for safety, ignore it if the
2103  * namespace doesn't exist or isn't a temp namespace after all.
2104  */
2105  if (checkTempNamespaceStatus(classForm->relnamespace) == TEMP_NAMESPACE_IDLE)
2106  {
2107  /*
2108  * The table seems to be orphaned -- although it might be that
2109  * the owning backend has already deleted it and exited; our
2110  * pg_class scan snapshot is not necessarily up-to-date
2111  * anymore, so we could be looking at a committed-dead entry.
2112  * Remember it so we can try to delete it later.
2113  */
2114  orphan_oids = lappend_oid(orphan_oids, relid);
2115  }
2116  continue;
2117  }
2118 
2119  /* Fetch reloptions and the pgstat entry for this table */
2120  relopts = extract_autovac_opts(tuple, pg_class_desc);
2121  tabentry = get_pgstat_tabentry_relid(relid, classForm->relisshared,
2122  shared, dbentry);
2123 
2124  /* Check if it needs vacuum or analyze */
2125  relation_needs_vacanalyze(relid, relopts, classForm, tabentry,
2126  effective_multixact_freeze_max_age,
2127  &dovacuum, &doanalyze, &wraparound);
2128 
2129  /* Relations that need work are added to table_oids */
2130  if (dovacuum || doanalyze)
2131  table_oids = lappend_oid(table_oids, relid);
2132 
2133  /*
2134  * Remember TOAST associations for the second pass. Note: we must do
2135  * this whether or not the table is going to be vacuumed, because we
2136  * don't automatically vacuum toast tables along the parent table.
2137  */
2138  if (OidIsValid(classForm->reltoastrelid))
2139  {
2140  av_relation *hentry;
2141  bool found;
2142 
2143  hentry = hash_search(table_toast_map,
2144  &classForm->reltoastrelid,
2145  HASH_ENTER, &found);
2146 
2147  if (!found)
2148  {
2149  /* hash_search already filled in the key */
2150  hentry->ar_relid = relid;
2151  hentry->ar_hasrelopts = false;
2152  if (relopts != NULL)
2153  {
2154  hentry->ar_hasrelopts = true;
2155  memcpy(&hentry->ar_reloptions, relopts,
2156  sizeof(AutoVacOpts));
2157  }
2158  }
2159  }
2160  }
2161 
2162  table_endscan(relScan);
2163 
2164  /* second pass: check TOAST tables */
2165  ScanKeyInit(&key,
2166  Anum_pg_class_relkind,
2167  BTEqualStrategyNumber, F_CHAREQ,
2168  CharGetDatum(RELKIND_TOASTVALUE));
2169 
2170  relScan = table_beginscan_catalog(classRel, 1, &key);
2171  while ((tuple = heap_getnext(relScan, ForwardScanDirection)) != NULL)
2172  {
2173  Form_pg_class classForm = (Form_pg_class) GETSTRUCT(tuple);
2174  PgStat_StatTabEntry *tabentry;
2175  Oid relid;
2176  AutoVacOpts *relopts = NULL;
2177  bool dovacuum;
2178  bool doanalyze;
2179  bool wraparound;
2180 
2181  /*
2182  * We cannot safely process other backends' temp tables, so skip 'em.
2183  */
2184  if (classForm->relpersistence == RELPERSISTENCE_TEMP)
2185  continue;
2186 
2187  relid = classForm->oid;
2188 
2189  /*
2190  * fetch reloptions -- if this toast table does not have them, try the
2191  * main rel
2192  */
2193  relopts = extract_autovac_opts(tuple, pg_class_desc);
2194  if (relopts == NULL)
2195  {
2196  av_relation *hentry;
2197  bool found;
2198 
2199  hentry = hash_search(table_toast_map, &relid, HASH_FIND, &found);
2200  if (found && hentry->ar_hasrelopts)
2201  relopts = &hentry->ar_reloptions;
2202  }
2203 
2204  /* Fetch the pgstat entry for this table */
2205  tabentry = get_pgstat_tabentry_relid(relid, classForm->relisshared,
2206  shared, dbentry);
2207 
2208  relation_needs_vacanalyze(relid, relopts, classForm, tabentry,
2209  effective_multixact_freeze_max_age,
2210  &dovacuum, &doanalyze, &wraparound);
2211 
2212  /* ignore analyze for toast tables */
2213  if (dovacuum)
2214  table_oids = lappend_oid(table_oids, relid);
2215  }
2216 
2217  table_endscan(relScan);
2218  table_close(classRel, AccessShareLock);
2219 
2220  /*
2221  * Recheck orphan temporary tables, and if they still seem orphaned, drop
2222  * them. We'll eat a transaction per dropped table, which might seem
2223  * excessive, but we should only need to do anything as a result of a
2224  * previous backend crash, so this should not happen often enough to
2225  * justify "optimizing". Using separate transactions ensures that we
2226  * don't bloat the lock table if there are many temp tables to be dropped,
2227  * and it ensures that we don't lose work if a deletion attempt fails.
2228  */
2229  foreach(cell, orphan_oids)
2230  {
2231  Oid relid = lfirst_oid(cell);
2232  Form_pg_class classForm;
2233  ObjectAddress object;
2234 
2235  /*
2236  * Check for user-requested abort.
2237  */
2239 
2240  /*
2241  * Try to lock the table. If we can't get the lock immediately,
2242  * somebody else is using (or dropping) the table, so it's not our
2243  * concern anymore. Having the lock prevents race conditions below.
2244  */
2246  continue;
2247 
2248  /*
2249  * Re-fetch the pg_class tuple and re-check whether it still seems to
2250  * be an orphaned temp table. If it's not there or no longer the same
2251  * relation, ignore it.
2252  */
2253  tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
2254  if (!HeapTupleIsValid(tuple))
2255  {
2256  /* be sure to drop useless lock so we don't bloat lock table */
2258  continue;
2259  }
2260  classForm = (Form_pg_class) GETSTRUCT(tuple);
2261 
2262  /*
2263  * Make all the same tests made in the loop above. In event of OID
2264  * counter wraparound, the pg_class entry we have now might be
2265  * completely unrelated to the one we saw before.
2266  */
2267  if (!((classForm->relkind == RELKIND_RELATION ||
2268  classForm->relkind == RELKIND_MATVIEW) &&
2269  classForm->relpersistence == RELPERSISTENCE_TEMP))
2270  {
2272  continue;
2273  }
2274 
2275  if (checkTempNamespaceStatus(classForm->relnamespace) != TEMP_NAMESPACE_IDLE)
2276  {
2278  continue;
2279  }
2280 
2281  /* OK, let's delete it */
2282  ereport(LOG,
2283  (errmsg("autovacuum: dropping orphan temp table \"%s.%s.%s\"",
2285  get_namespace_name(classForm->relnamespace),
2286  NameStr(classForm->relname))));
2287 
2288  object.classId = RelationRelationId;
2289  object.objectId = relid;
2290  object.objectSubId = 0;
2291  performDeletion(&object, DROP_CASCADE,
2295 
2296  /*
2297  * To commit the deletion, end current transaction and start a new
2298  * one. Note this also releases the lock we took.
2299  */
2302 
2303  /* StartTransactionCommand changed current memory context */
2305  }
2306 
2307  /*
2308  * Create a buffer access strategy object for VACUUM to use. We want to
2309  * use the same one across all the vacuum operations we perform, since the
2310  * point is for VACUUM not to blow out the shared cache.
2311  */
2312  bstrategy = GetAccessStrategy(BAS_VACUUM);
2313 
2314  /*
2315  * create a memory context to act as fake PortalContext, so that the
2316  * contexts created in the vacuum code are cleaned up for each table.
2317  */
2319  "Autovacuum Portal",
2321 
2322  /*
2323  * Perform operations on collected tables.
2324  */
2325  foreach(cell, table_oids)
2326  {
2327  Oid relid = lfirst_oid(cell);
2328  HeapTuple classTup;
2329  autovac_table *tab;
2330  bool isshared;
2331  bool skipit;
2332  double stdVacuumCostDelay;
2333  int stdVacuumCostLimit;
2334  dlist_iter iter;
2335 
2337 
2338  /*
2339  * Check for config changes before processing each collected table.
2340  */
2341  if (ConfigReloadPending)
2342  {
2343  ConfigReloadPending = false;
2345 
2346  /*
2347  * You might be tempted to bail out if we see autovacuum is now
2348  * disabled. Must resist that temptation -- this might be a
2349  * for-wraparound emergency worker, in which case that would be
2350  * entirely inappropriate.
2351  */
2352  }
2353 
2354  /*
2355  * Find out whether the table is shared or not. (It's slightly
2356  * annoying to fetch the syscache entry just for this, but in typical
2357  * cases it adds little cost because table_recheck_autovac would
2358  * refetch the entry anyway. We could buy that back by copying the
2359  * tuple here and passing it to table_recheck_autovac, but that
2360  * increases the odds of that function working with stale data.)
2361  */
2362  classTup = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
2363  if (!HeapTupleIsValid(classTup))
2364  continue; /* somebody deleted the rel, forget it */
2365  isshared = ((Form_pg_class) GETSTRUCT(classTup))->relisshared;
2366  ReleaseSysCache(classTup);
2367 
2368  /*
2369  * Hold schedule lock from here until we've claimed the table. We
2370  * also need the AutovacuumLock to walk the worker array, but that one
2371  * can just be a shared lock.
2372  */
2373  LWLockAcquire(AutovacuumScheduleLock, LW_EXCLUSIVE);
2374  LWLockAcquire(AutovacuumLock, LW_SHARED);
2375 
2376  /*
2377  * Check whether the table is being vacuumed concurrently by another
2378  * worker.
2379  */
2380  skipit = false;
2382  {
2383  WorkerInfo worker = dlist_container(WorkerInfoData, wi_links, iter.cur);
2384 
2385  /* ignore myself */
2386  if (worker == MyWorkerInfo)
2387  continue;
2388 
2389  /* ignore workers in other databases (unless table is shared) */
2390  if (!worker->wi_sharedrel && worker->wi_dboid != MyDatabaseId)
2391  continue;
2392 
2393  if (worker->wi_tableoid == relid)
2394  {
2395  skipit = true;
2396  found_concurrent_worker = true;
2397  break;
2398  }
2399  }
2400  LWLockRelease(AutovacuumLock);
2401  if (skipit)
2402  {
2403  LWLockRelease(AutovacuumScheduleLock);
2404  continue;
2405  }
2406 
2407  /*
2408  * Store the table's OID in shared memory before releasing the
2409  * schedule lock, so that other workers don't try to vacuum it
2410  * concurrently. (We claim it here so as not to hold
2411  * AutovacuumScheduleLock while rechecking the stats.)
2412  */
2413  MyWorkerInfo->wi_tableoid = relid;
2414  MyWorkerInfo->wi_sharedrel = isshared;
2415  LWLockRelease(AutovacuumScheduleLock);
2416 
2417  /*
2418  * Check whether pgstat data still says we need to vacuum this table.
2419  * It could have changed if something else processed the table while
2420  * we weren't looking.
2421  *
2422  * Note: we have a special case in pgstat code to ensure that the
2423  * stats we read are as up-to-date as possible, to avoid the problem
2424  * that somebody just finished vacuuming this table. The window to
2425  * the race condition is not closed but it is very small.
2426  */
2428  tab = table_recheck_autovac(relid, table_toast_map, pg_class_desc,
2429  effective_multixact_freeze_max_age);
2430  if (tab == NULL)
2431  {
2432  /* someone else vacuumed the table, or it went away */
2433  LWLockAcquire(AutovacuumScheduleLock, LW_EXCLUSIVE);
2435  MyWorkerInfo->wi_sharedrel = false;
2436  LWLockRelease(AutovacuumScheduleLock);
2437  continue;
2438  }
2439 
2440  /*
2441  * Remember the prevailing values of the vacuum cost GUCs. We have to
2442  * restore these at the bottom of the loop, else we'll compute wrong
2443  * values in the next iteration of autovac_balance_cost().
2444  */
2445  stdVacuumCostDelay = VacuumCostDelay;
2446  stdVacuumCostLimit = VacuumCostLimit;
2447 
2448  /* Must hold AutovacuumLock while mucking with cost balance info */
2449  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
2450 
2451  /* advertise my cost delay parameters for the balancing algorithm */
2456 
2457  /* do a balance */
2459 
2460  /* set the active cost parameters from the result of that */
2462 
2463  /* done */
2464  LWLockRelease(AutovacuumLock);
2465 
2466  /* clean up memory before each iteration */
2468 
2469  /*
2470  * Save the relation name for a possible error message, to avoid a
2471  * catalog lookup in case of an error. If any of these return NULL,
2472  * then the relation has been dropped since last we checked; skip it.
2473  * Note: they must live in a long-lived memory context because we call
2474  * vacuum and analyze in different transactions.
2475  */
2476 
2477  tab->at_relname = get_rel_name(tab->at_relid);
2480  if (!tab->at_relname || !tab->at_nspname || !tab->at_datname)
2481  goto deleted;
2482 
2483  /*
2484  * We will abort vacuuming the current table if something errors out,
2485  * and continue with the next one in schedule; in particular, this
2486  * happens if we are interrupted with SIGINT.
2487  */
2488  PG_TRY();
2489  {
2490  /* Use PortalContext for any per-table allocations */
2492 
2493  /* have at it */
2494  autovacuum_do_vac_analyze(tab, bstrategy);
2495 
2496  /*
2497  * Clear a possible query-cancel signal, to avoid a late reaction
2498  * to an automatically-sent signal because of vacuuming the
2499  * current table (we're done with it, so it would make no sense to
2500  * cancel at this point.)
2501  */
2502  QueryCancelPending = false;
2503  }
2504  PG_CATCH();
2505  {
2506  /*
2507  * Abort the transaction, start a new one, and proceed with the
2508  * next table in our list.
2509  */
2510  HOLD_INTERRUPTS();
2511  if (tab->at_params.options & VACOPT_VACUUM)
2512  errcontext("automatic vacuum of table \"%s.%s.%s\"",
2513  tab->at_datname, tab->at_nspname, tab->at_relname);
2514  else
2515  errcontext("automatic analyze of table \"%s.%s.%s\"",
2516  tab->at_datname, tab->at_nspname, tab->at_relname);
2517  EmitErrorReport();
2518 
2519  /* this resets ProcGlobal->statusFlags[i] too */
2521  FlushErrorState();
2523 
2524  /* restart our transaction for the following operations */
2527  }
2528  PG_END_TRY();
2529 
2530  /* Make sure we're back in AutovacMemCxt */
2532 
2533  did_vacuum = true;
2534 
2535  /* ProcGlobal->statusFlags[i] are reset at the next end of xact */
2536 
2537  /* be tidy */
2538 deleted:
2539  if (tab->at_datname != NULL)
2540  pfree(tab->at_datname);
2541  if (tab->at_nspname != NULL)
2542  pfree(tab->at_nspname);
2543  if (tab->at_relname != NULL)
2544  pfree(tab->at_relname);
2545  pfree(tab);
2546 
2547  /*
2548  * Remove my info from shared memory. We could, but intentionally
2549  * don't, clear wi_cost_limit and friends --- this is on the
2550  * assumption that we probably have more to do with similar cost
2551  * settings, so we don't want to give up our share of I/O for a very
2552  * short interval and thereby thrash the global balance.
2553  */
2554  LWLockAcquire(AutovacuumScheduleLock, LW_EXCLUSIVE);
2556  MyWorkerInfo->wi_sharedrel = false;
2557  LWLockRelease(AutovacuumScheduleLock);
2558 
2559  /* restore vacuum cost GUCs for the next iteration */
2560  VacuumCostDelay = stdVacuumCostDelay;
2561  VacuumCostLimit = stdVacuumCostLimit;
2562  }
2563 
2564  /*
2565  * Perform additional work items, as requested by backends.
2566  */
2567  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
2568  for (i = 0; i < NUM_WORKITEMS; i++)
2569  {
2571 
2572  if (!workitem->avw_used)
2573  continue;
2574  if (workitem->avw_active)
2575  continue;
2576  if (workitem->avw_database != MyDatabaseId)
2577  continue;
2578 
2579  /* claim this one, and release lock while performing it */
2580  workitem->avw_active = true;
2581  LWLockRelease(AutovacuumLock);
2582 
2583  perform_work_item(workitem);
2584 
2585  /*
2586  * Check for config changes before acquiring lock for further jobs.
2587  */
2589  if (ConfigReloadPending)
2590  {
2591  ConfigReloadPending = false;
2593  }
2594 
2595  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
2596 
2597  /* and mark it done */
2598  workitem->avw_active = false;
2599  workitem->avw_used = false;
2600  }
2601  LWLockRelease(AutovacuumLock);
2602 
2603  /*
2604  * We leak table_toast_map here (among other things), but since we're
2605  * going away soon, it's not a problem.
2606  */
2607 
2608  /*
2609  * Update pg_database.datfrozenxid, and truncate pg_xact if possible. We
2610  * only need to do this once, not after each table.
2611  *
2612  * Even if we didn't vacuum anything, it may still be important to do
2613  * this, because one indirect effect of vac_update_datfrozenxid() is to
2614  * update ShmemVariableCache->xidVacLimit. That might need to be done
2615  * even if we haven't vacuumed anything, because relations with older
2616  * relfrozenxid values or other databases with older datfrozenxid values
2617  * might have been dropped, allowing xidVacLimit to advance.
2618  *
2619  * However, it's also important not to do this blindly in all cases,
2620  * because when autovacuum=off this will restart the autovacuum launcher.
2621  * If we're not careful, an infinite loop can result, where workers find
2622  * no work to do and restart the launcher, which starts another worker in
2623  * the same database that finds no work to do. To prevent that, we skip
2624  * this if (1) we found no work to do and (2) we skipped at least one
2625  * table due to concurrent autovacuum activity. In that case, the other
2626  * worker has already done it, or will do so when it finishes.
2627  */
2628  if (did_vacuum || !found_concurrent_worker)
2630 
2631  /* Finally close out the last transaction. */
2633 }
BufferAccessStrategy GetAccessStrategy(BufferAccessStrategyType btype)
Definition: freelist.c:542
#define NIL
Definition: pg_list.h:65
bool ConditionalLockRelationOid(Oid relid, LOCKMODE lockmode)
Definition: lmgr.c:152
static int default_freeze_table_age
Definition: autovacuum.c:152
TupleDesc CreateTupleDescCopy(TupleDesc tupdesc)
Definition: tupdesc.c:111
#define AllocSetContextCreate
Definition: memutils.h:173
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
#define NUM_WORKITEMS
Definition: autovacuum.c:264
#define GETSTRUCT(TUP)
Definition: htup_details.h:654
static void autovac_balance_cost(void)
Definition: autovacuum.c:1799
int vacuum_multixact_freeze_table_age
Definition: vacuum.c:64
#define HASH_ELEM
Definition: hsearch.h:95
void ProcessConfigFile(GucContext context)
static AutoVacOpts * extract_autovac_opts(HeapTuple tup, TupleDesc pg_class_desc)
Definition: autovacuum.c:2750
void vac_update_datfrozenxid(void)
Definition: vacuum.c:1433
TableScanDesc table_beginscan_catalog(Relation relation, int nkeys, struct ScanKeyData *key)
Definition: tableam.c:112
static int default_multixact_freeze_min_age
Definition: autovacuum.c:153
#define RelationGetDescr(relation)
Definition: rel.h:503
void UnlockRelationOid(Oid relid, LOCKMODE lockmode)
Definition: lmgr.c:200
FormData_pg_database * Form_pg_database
Definition: pg_database.h:81
#define dlist_foreach(iter, lhead)
Definition: ilist.h:526
void CommitTransactionCommand(void)
Definition: xact.c:2953
static MemoryContext AutovacMemCxt
Definition: autovacuum.c:157
double wi_cost_delay
Definition: autovacuum.c:229
Oid get_rel_namespace(Oid relid)
Definition: lsyscache.c:1923
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
#define AccessShareLock
Definition: lockdefs.h:36
Size entrysize
Definition: hsearch.h:76
PgStat_StatDBEntry * pgstat_fetch_stat_dbentry(Oid dbid)
Definition: pgstat.c:2774
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:954
char * at_datname
Definition: autovacuum.c:199
#define LOG
Definition: elog.h:26
unsigned int Oid
Definition: postgres_ext.h:31
List * lappend_oid(List *list, Oid datum)
Definition: list.c:372
#define OidIsValid(objectId)
Definition: c.h:710
void AbortOutOfAnyTransaction(void)
Definition: xact.c:4593
void FlushErrorState(void)
Definition: elog.c:1654
MemoryContext PortalContext
Definition: mcxt.c:57
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
TempNamespaceStatus checkTempNamespaceStatus(Oid namespaceId)
Definition: namespace.c:3282
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:133
int at_vacuum_cost_limit
Definition: autovacuum.c:194
Definition: dynahash.c:219
char * at_relname
Definition: autovacuum.c:197
#define dlist_container(type, membername, ptr)
Definition: ilist.h:496
bits32 options
Definition: vacuum.h:211
void pfree(void *pointer)
Definition: mcxt.c:1169
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
#define ERROR
Definition: elog.h:46
int VacuumCostLimit
Definition: globals.c:144
int vacuum_multixact_freeze_min_age
Definition: vacuum.c:63
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:195
char * get_database_name(Oid dbid)
Definition: dbcommands.c:2113
AutoVacuumWorkItem av_workItems[NUM_WORKITEMS]
Definition: autovacuum.c:289
char * get_namespace_name(Oid nspid)
Definition: lsyscache.c:3316
HeapTuple heap_getnext(TableScanDesc sscan, ScanDirection direction)
Definition: heapam.c:1340
void performDeletion(const ObjectAddress *object, DropBehavior behavior, int flags)
Definition: dependency.c:313
HTAB * hash_create(const char *tabname, long nelem, const HASHCTL *info, int flags)
Definition: dynahash.c:349
static void perform_work_item(AutoVacuumWorkItem *workitem)
Definition: autovacuum.c:2639
static WorkerInfo MyWorkerInfo
Definition: autovacuum.c:302
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:3062
void pgstat_vacuum_stat(void)
Definition: pgstat.c:1118
int MultiXactMemberFreezeThreshold(void)
Definition: multixact.c:2828
int wi_cost_limit_base
Definition: autovacuum.c:231
MemoryContext TopMemoryContext
Definition: mcxt.c:48
Definition: guc.h:72
HeapTuple SearchSysCache1(int cacheId, Datum key1)
Definition: syscache.c:1127
#define MemoryContextResetAndDeleteChildren(ctx)
Definition: memutils.h:67
#define HASH_BLOBS
Definition: hsearch.h:97
char * at_nspname
Definition: autovacuum.c:198
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1175
Oid MyDatabaseId
Definition: globals.c:88
double at_vacuum_cost_delay
Definition: autovacuum.c:193
Size keysize
Definition: hsearch.h:75
dlist_node * cur
Definition: ilist.h:161
void EmitErrorReport(void)
Definition: elog.c:1509
#define InvalidOid
Definition: postgres_ext.h:36
static PgStat_StatTabEntry * get_pgstat_tabentry_relid(Oid relid, bool isshared, PgStat_StatDBEntry *shared, PgStat_StatDBEntry *dbentry)
Definition: autovacuum.c:2776
VacuumParams at_params
Definition: autovacuum.c:192
#define ereport(elevel,...)
Definition: elog.h:157
#define PG_CATCH()
Definition: elog.h:323
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define VACOPT_VACUUM
Definition: vacuum.h:178
#define PERFORM_DELETION_QUIETLY
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Definition: xact.c:2852
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
int vacuum_freeze_min_age
Definition: vacuum.c:61
int vacuum_freeze_table_age
Definition: vacuum.c:62
#define CharGetDatum(X)
Definition: postgres.h:460
static void table_endscan(TableScanDesc scan)
Definition: tableam.h:991
FormData_pg_class * Form_pg_class
Definition: pg_class.h:153
#define SearchSysCacheCopy1(cacheId, key1)
Definition: syscache.h:175
AutoVacOpts ar_reloptions
Definition: autovacuum.c:184
#define AccessExclusiveLock
Definition: lockdefs.h:45
static void autovacuum_do_vac_analyze(autovac_table *tab, BufferAccessStrategy bstrategy)
Definition: autovacuum.c:3232
int errmsg(const char *fmt,...)
Definition: elog.c:909
double VacuumCostDelay
Definition: globals.c:145
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:131
#define elog(elevel,...)
Definition: elog.h:232
volatile sig_atomic_t ConfigReloadPending
Definition: interrupt.c:26
int i
#define errcontext
Definition: elog.h:204
#define NameStr(name)
Definition: c.h:681
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:1783
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:120
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:2803
dlist_head av_runningWorkers
Definition: autovacuum.c:287
#define PG_TRY()
Definition: elog.h:313
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
#define PERFORM_DELETION_SKIP_EXTENSIONS
Definition: dependency.h:137
bool ar_hasrelopts
Definition: autovacuum.c:183
Definition: pg_list.h:50
char * get_rel_name(Oid relid)
Definition: lsyscache.c:1899
static int default_multixact_freeze_table_age
Definition: autovacuum.c:154
static int default_freeze_min_age
Definition: autovacuum.c:151
#define PG_END_TRY()
Definition: elog.h:338
#define BTEqualStrategyNumber
Definition: stratnum.h:31
bool at_dobalance
Definition: autovacuum.c:195
#define lfirst_oid(lc)
Definition: pg_list.h:171
#define PERFORM_DELETION_INTERNAL
Definition: dependency.h:133

◆ do_start_worker()

static Oid do_start_worker ( void  )
static

Definition at line 1153 of file autovacuum.c.

References avl_dbase::adl_datid, avl_dbase::adl_next_worker, avl_dbase::adl_node, 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(), pgstat_fetch_stat_dbentry(), PMSIGNAL_START_AUTOVAC_WORKER, ReadNextMultiXactId(), ReadNextTransactionId(), rebuild_database_list(), recentMulti, recentXid, SendPostmasterSignal(), TimestampDifferenceExceeds(), TransactionIdPrecedes(), WorkerInfoData::wi_dboid, WorkerInfoData::wi_launchtime, and WorkerInfoData::wi_proc.

Referenced by AutoVacLauncherMain(), and launch_worker().

1154 {
1155  List *dblist;
1156  ListCell *cell;
1157  TransactionId xidForceLimit;
1158  MultiXactId multiForceLimit;
1159  bool for_xid_wrap;
1160  bool for_multi_wrap;
1161  avw_dbase *avdb;
1162  TimestampTz current_time;
1163  bool skipit = false;
1164  Oid retval = InvalidOid;
1165  MemoryContext tmpcxt,
1166  oldcxt;
1167 
1168  /* return quickly when there are no free workers */
1169  LWLockAcquire(AutovacuumLock, LW_SHARED);
1171  {
1172  LWLockRelease(AutovacuumLock);
1173  return InvalidOid;
1174  }
1175  LWLockRelease(AutovacuumLock);
1176 
1177  /*
1178  * Create and switch to a temporary context to avoid leaking the memory
1179  * allocated for the database list.
1180  */
1182  "Start worker tmp cxt",
1184  oldcxt = MemoryContextSwitchTo(tmpcxt);
1185 
1186  /* use fresh stats */
1188 
1189  /* Get a list of databases */
1190  dblist = get_database_list();
1191 
1192  /*
1193  * Determine the oldest datfrozenxid/relfrozenxid that we will allow to
1194  * pass without forcing a vacuum. (This limit can be tightened for
1195  * particular tables, but not loosened.)
1196  */
1198  xidForceLimit = recentXid - autovacuum_freeze_max_age;
1199  /* ensure it's a "normal" XID, else TransactionIdPrecedes misbehaves */
1200  /* this can cause the limit to go backwards by 3, but that's OK */
1201  if (xidForceLimit < FirstNormalTransactionId)
1202  xidForceLimit -= FirstNormalTransactionId;
1203 
1204  /* Also determine the oldest datminmxid we will consider. */
1206  multiForceLimit = recentMulti - MultiXactMemberFreezeThreshold();
1207  if (multiForceLimit < FirstMultiXactId)
1208  multiForceLimit -= FirstMultiXactId;
1209 
1210  /*
1211  * Choose a database to connect to. We pick the database that was least
1212  * recently auto-vacuumed, or one that needs vacuuming to prevent Xid
1213  * wraparound-related data loss. If any db at risk of Xid wraparound is
1214  * found, we pick the one with oldest datfrozenxid, independently of
1215  * autovacuum times; similarly we pick the one with the oldest datminmxid
1216  * if any is in MultiXactId wraparound. Note that those in Xid wraparound
1217  * danger are given more priority than those in multi wraparound danger.
1218  *
1219  * Note that a database with no stats entry is not considered, except for
1220  * Xid wraparound purposes. The theory is that if no one has ever
1221  * connected to it since the stats were last initialized, it doesn't need
1222  * vacuuming.
1223  *
1224  * XXX This could be improved if we had more info about whether it needs
1225  * vacuuming before connecting to it. Perhaps look through the pgstats
1226  * data for the database's tables? One idea is to keep track of the
1227  * number of new and dead tuples per database in pgstats. However it
1228  * isn't clear how to construct a metric that measures that and not cause
1229  * starvation for less busy databases.
1230  */
1231  avdb = NULL;
1232  for_xid_wrap = false;
1233  for_multi_wrap = false;
1234  current_time = GetCurrentTimestamp();
1235  foreach(cell, dblist)
1236  {
1237  avw_dbase *tmp = lfirst(cell);
1238  dlist_iter iter;
1239 
1240  /* Check to see if this one is at risk of wraparound */
1241  if (TransactionIdPrecedes(tmp->adw_frozenxid, xidForceLimit))
1242  {
1243  if (avdb == NULL ||
1245  avdb->adw_frozenxid))
1246  avdb = tmp;
1247  for_xid_wrap = true;
1248  continue;
1249  }
1250  else if (for_xid_wrap)
1251  continue; /* ignore not-at-risk DBs */
1252  else if (MultiXactIdPrecedes(tmp->adw_minmulti, multiForceLimit))
1253  {
1254  if (avdb == NULL ||
1256  avdb = tmp;
1257  for_multi_wrap = true;
1258  continue;
1259  }
1260  else if (for_multi_wrap)
1261  continue; /* ignore not-at-risk DBs */
1262 
1263  /* Find pgstat entry if any */
1265 
1266  /*
1267  * Skip a database with no pgstat entry; it means it hasn't seen any
1268  * activity.
1269  */
1270  if (!tmp->adw_entry)
1271  continue;
1272 
1273  /*
1274  * Also, skip a database that appears on the database list as having
1275  * been processed recently (less than autovacuum_naptime seconds ago).
1276  * We do this so that we don't select a database which we just
1277  * selected, but that pgstat hasn't gotten around to updating the last
1278  * autovacuum time yet.
1279  */
1280  skipit = false;
1281 
1283  {
1284  avl_dbase *dbp = dlist_container(avl_dbase, adl_node, iter.cur);
1285 
1286  if (dbp->adl_datid == tmp->adw_datid)
1287  {
1288  /*
1289  * Skip this database if its next_worker value falls between
1290  * the current time and the current time plus naptime.
1291  */
1293  current_time, 0) &&
1294  !TimestampDifferenceExceeds(current_time,
1295  dbp->adl_next_worker,
1296  autovacuum_naptime * 1000))
1297  skipit = true;
1298 
1299  break;
1300  }
1301  }
1302  if (skipit)
1303  continue;
1304 
1305  /*
1306  * Remember the db with oldest autovac time. (If we are here, both
1307  * tmp->entry and db->entry must be non-null.)
1308  */
1309  if (avdb == NULL ||
1311  avdb = tmp;
1312  }
1313 
1314  /* Found a database -- process it */
1315  if (avdb != NULL)
1316  {
1317  WorkerInfo worker;
1318  dlist_node *wptr;
1319 
1320  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
1321 
1322  /*
1323  * Get a worker entry from the freelist. We checked above, so there
1324  * really should be a free slot.
1325  */
1327 
1328  worker = dlist_container(WorkerInfoData, wi_links, wptr);
1329  worker->wi_dboid = avdb->adw_datid;
1330  worker->wi_proc = NULL;
1331  worker->wi_launchtime = GetCurrentTimestamp();
1332 
1334 
1335  LWLockRelease(AutovacuumLock);
1336 
1338 
1339  retval = avdb->adw_datid;
1340  }
1341  else if (skipit)
1342  {
1343  /*
1344  * If we skipped all databases on the list, rebuild it, because it
1345  * probably contains a dropped database.
1346  */
1348  }
1349 
1350  MemoryContextSwitchTo(oldcxt);
1351  MemoryContextDelete(tmpcxt);
1352 
1353  return retval;
1354 }
int autovacuum_naptime
Definition: autovacuum.c:117
TimestampTz adl_next_worker
Definition: autovacuum.c:163
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:218
#define AllocSetContextCreate
Definition: memutils.h:173
MultiXactId adw_minmulti
Definition: autovacuum.c:174
WorkerInfo av_startingWorker
Definition: autovacuum.c:288
dlist_head av_freeWorkers
Definition: autovacuum.c:286
uint32 TransactionId
Definition: c.h:587
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1580
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:148
static void autovac_refresh_stats(void)
Definition: autovacuum.c:3488
PgStat_StatDBEntry * pgstat_fetch_stat_dbentry(Oid dbid)
Definition: pgstat.c:2774
static TransactionId ReadNextTransactionId(void)
Definition: transam.h:316
unsigned int Oid
Definition: postgres_ext.h:31
bool TimestampDifferenceExceeds(TimestampTz start_time, TimestampTz stop_time, int msec)
Definition: timestamp.c:1711
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
#define dlist_container(type, membername, ptr)
Definition: ilist.h:496
#define FirstNormalTransactionId
Definition: transam.h:34
int autovacuum_freeze_max_age
Definition: autovacuum.c:124
Oid adl_datid
Definition: autovacuum.c:162
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:195
_stringlist * dblist
Definition: pg_regress.c:75
TimestampTz last_autovac_time
Definition: pgstat.h:746
#define FirstMultiXactId
Definition: multixact.h:25
MemoryContext CurrentMemoryContext
Definition: mcxt.c:42
static dlist_head DatabaseList
Definition: autovacuum.c:298
int MultiXactMemberFreezeThreshold(void)
Definition: multixact.c:2828
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:300
TransactionId adw_frozenxid
Definition: autovacuum.c:173
PgStat_StatDBEntry * adw_entry
Definition: autovacuum.c:175
Oid adw_datid
Definition: autovacuum.c:171
static TransactionId recentXid
Definition: autovacuum.c:147
dlist_node * cur
Definition: ilist.h:161
#define InvalidOid
Definition: postgres_ext.h:36
TransactionId MultiXactId
Definition: c.h:597
#define lfirst(lc)
Definition: pg_list.h:169
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:1199
bool MultiXactIdPrecedes(MultiXactId multi1, MultiXactId multi2)
Definition: multixact.c:3159
static List * get_database_list(void)
Definition: autovacuum.c:1887
static void rebuild_database_list(Oid newdb)
Definition: autovacuum.c:952
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:153
Definition: pg_list.h:50
#define dlist_reverse_foreach(iter, lhead)
Definition: ilist.h:557
MultiXactId ReadNextMultiXactId(void)
Definition: multixact.c:723

◆ extract_autovac_opts()

static AutoVacOpts* extract_autovac_opts ( HeapTuple  tup,
TupleDesc  pg_class_desc 
)
static

Definition at line 2750 of file autovacuum.c.

References Assert, av, extractRelOptions(), GETSTRUCT, palloc(), and pfree().

Referenced by do_autovacuum(), and table_recheck_autovac().

2751 {
2752  bytea *relopts;
2753  AutoVacOpts *av;
2754 
2755  Assert(((Form_pg_class) GETSTRUCT(tup))->relkind == RELKIND_RELATION ||
2756  ((Form_pg_class) GETSTRUCT(tup))->relkind == RELKIND_MATVIEW ||
2757  ((Form_pg_class) GETSTRUCT(tup))->relkind == RELKIND_TOASTVALUE);
2758 
2759  relopts = extractRelOptions(tup, pg_class_desc, NULL);
2760  if (relopts == NULL)
2761  return NULL;
2762 
2763  av = palloc(sizeof(AutoVacOpts));
2764  memcpy(av, &(((StdRdOptions *) relopts)->autovacuum), sizeof(AutoVacOpts));
2765  pfree(relopts);
2766 
2767  return av;
2768 }
#define GETSTRUCT(TUP)
Definition: htup_details.h:654
struct @11::@12 av[32]
void pfree(void *pointer)
Definition: mcxt.c:1169
bytea * extractRelOptions(HeapTuple tuple, TupleDesc tupdesc, amoptions_function amoptions)
Definition: reloptions.c:1374
#define Assert(condition)
Definition: c.h:804
FormData_pg_class * Form_pg_class
Definition: pg_class.h:153
void * palloc(Size size)
Definition: mcxt.c:1062
Definition: c.h:621

◆ FreeWorkerInfo()

static void FreeWorkerInfo ( int  code,
Datum  arg 
)
static

Definition at line 1734 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(), 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().

1735 {
1736  if (MyWorkerInfo != NULL)
1737  {
1738  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
1739 
1740  /*
1741  * Wake the launcher up so that he can launch a new worker immediately
1742  * if required. We only save the launcher's PID in local memory here;
1743  * the actual signal will be sent when the PGPROC is recycled. Note
1744  * that we always do this, so that the launcher can rebalance the cost
1745  * limit setting of the remaining workers.
1746  *
1747  * We somewhat ignore the risk that the launcher changes its PID
1748  * between us reading it and the actual kill; we expect ProcKill to be
1749  * called shortly after us, and we assume that PIDs are not reused too
1750  * quickly after a process exits.
1751  */
1753 
1757  MyWorkerInfo->wi_sharedrel = false;
1758  MyWorkerInfo->wi_proc = NULL;
1760  MyWorkerInfo->wi_dobalance = false;
1766  /* not mine anymore */
1767  MyWorkerInfo = NULL;
1768 
1769  /*
1770  * now that we're inactive, cause a rebalancing of the surviving
1771  * workers
1772  */
1774  LWLockRelease(AutovacuumLock);
1775  }
1776 }
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
double wi_cost_delay
Definition: autovacuum.c:229
dlist_node wi_links
Definition: autovacuum.c:222
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
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
static AutoVacuumShmemStruct * AutoVacuumShmem
Definition: autovacuum.c:292
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
PGPROC * wi_proc
Definition: autovacuum.c:225

◆ get_database_list()

static List* get_database_list ( void  )
static

Definition at line 1887 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, dblist, ForwardScanDirection, GETSTRUCT, GetTransactionSnapshot(), heap_getnext(), HeapTupleIsValid, lappend(), MemoryContextSwitchTo(), NameStr, NIL, palloc(), pstrdup(), StartTransactionCommand(), table_beginscan_catalog(), table_close(), table_endscan(), and table_open().

Referenced by do_start_worker(), and rebuild_database_list().

1888 {
1889  List *dblist = NIL;
1890  Relation rel;
1891  TableScanDesc scan;
1892  HeapTuple tup;
1893  MemoryContext resultcxt;
1894 
1895  /* This is the context that we will allocate our output data in */
1896  resultcxt = CurrentMemoryContext;
1897 
1898  /*
1899  * Start a transaction so we can access pg_database, and get a snapshot.
1900  * We don't have a use for the snapshot itself, but we're interested in
1901  * the secondary effect that it sets RecentGlobalXmin. (This is critical
1902  * for anything that reads heap pages, because HOT may decide to prune
1903  * them even if the process doesn't attempt to modify any tuples.)
1904  *
1905  * FIXME: This comment is inaccurate / the code buggy. A snapshot that is
1906  * not pushed/active does not reliably prevent HOT pruning (->xmin could
1907  * e.g. be cleared when cache invalidations are processed).
1908  */
1910  (void) GetTransactionSnapshot();
1911 
1912  rel = table_open(DatabaseRelationId, AccessShareLock);
1913  scan = table_beginscan_catalog(rel, 0, NULL);
1914 
1915  while (HeapTupleIsValid(tup = heap_getnext(scan, ForwardScanDirection)))
1916  {
1917  Form_pg_database pgdatabase = (Form_pg_database) GETSTRUCT(tup);
1918  avw_dbase *avdb;
1919  MemoryContext oldcxt;
1920 
1921  /*
1922  * Allocate our results in the caller's context, not the
1923  * transaction's. We do this inside the loop, and restore the original
1924  * context at the end, so that leaky things like heap_getnext() are
1925  * not called in a potentially long-lived context.
1926  */
1927  oldcxt = MemoryContextSwitchTo(resultcxt);
1928 
1929  avdb = (avw_dbase *) palloc(sizeof(avw_dbase));
1930 
1931  avdb->adw_datid = pgdatabase->oid;
1932  avdb->adw_name = pstrdup(NameStr(pgdatabase->datname));
1933  avdb->adw_frozenxid = pgdatabase->datfrozenxid;
1934  avdb->adw_minmulti = pgdatabase->datminmxid;
1935  /* this gets set later: */
1936  avdb->adw_entry = NULL;
1937 
1938  dblist = lappend(dblist, avdb);
1939  MemoryContextSwitchTo(oldcxt);
1940  }
1941 
1942  table_endscan(scan);
1944 
1946 
1947  return dblist;
1948 }
#define NIL
Definition: pg_list.h:65
MultiXactId adw_minmulti
Definition: autovacuum.c:174
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:167
#define GETSTRUCT(TUP)
Definition: htup_details.h:654
TableScanDesc table_beginscan_catalog(Relation relation, int nkeys, struct ScanKeyData *key)
Definition: tableam.c:112
FormData_pg_database * Form_pg_database
Definition: pg_database.h:81
char * pstrdup(const char *in)
Definition: mcxt.c:1299
void CommitTransactionCommand(void)
Definition: xact.c:2953
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
#define AccessShareLock
Definition: lockdefs.h:36
Snapshot GetTransactionSnapshot(void)
Definition: snapmgr.c:250
_stringlist * dblist
Definition: pg_regress.c:75
HeapTuple heap_getnext(TableScanDesc sscan, ScanDirection direction)
Definition: heapam.c:1340
MemoryContext CurrentMemoryContext
Definition: mcxt.c:42
char * adw_name
Definition: autovacuum.c:172
List * lappend(List *list, void *datum)
Definition: list.c:336
TransactionId adw_frozenxid
Definition: autovacuum.c:173
PgStat_StatDBEntry * adw_entry
Definition: autovacuum.c:175
Oid adw_datid
Definition: autovacuum.c:171
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
void StartTransactionCommand(void)
Definition: xact.c:2852
static void table_endscan(TableScanDesc scan)
Definition: tableam.h:991
void * palloc(Size size)
Definition: mcxt.c:1062
#define NameStr(name)
Definition: c.h:681
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
Definition: pg_list.h:50

◆ get_pgstat_tabentry_relid()

static PgStat_StatTabEntry* get_pgstat_tabentry_relid ( Oid  relid,
bool  isshared,
PgStat_StatDBEntry shared,
PgStat_StatDBEntry dbentry 
)
static

Definition at line 2776 of file autovacuum.c.

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

Referenced by do_autovacuum(), and recheck_relation_needs_vacanalyze().

2778 {
2779  PgStat_StatTabEntry *tabentry = NULL;
2780 
2781  if (isshared)
2782  {
2783  if (PointerIsValid(shared))
2784  tabentry = hash_search(shared->tables, &relid,
2785  HASH_FIND, NULL);
2786  }
2787  else if (PointerIsValid(dbentry))
2788  tabentry = hash_search(dbentry->tables, &relid,
2789  HASH_FIND, NULL);
2790 
2791  return tabentry;
2792 }
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:954
#define PointerIsValid(pointer)
Definition: c.h:698

◆ HandleAutoVacLauncherInterrupts()

static void HandleAutoVacLauncherInterrupts ( void  )
static

Definition at line 811 of file autovacuum.c.

References autovac_balance_cost(), AutoVacLauncherShutdown(), AutoVacuumingActive(), AutoVacuumShmemStruct::av_launcherpid, ConfigReloadPending, DEBUG1, ereport, errmsg_internal(), InvalidOid, LogMemoryContextPending, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), PGC_SIGHUP, proc_exit(), ProcessCatchupInterrupt(), ProcessConfigFile(), ProcessLogMemoryContextInterrupt(), ProcessProcSignalBarrier(), ProcSignalBarrierPending, rebuild_database_list(), and ShutdownRequestPending.

Referenced by AutoVacLauncherMain().

812 {
813  /* the normal shutdown case */
816 
818  {
819  ConfigReloadPending = false;
821 
822  /* shutdown requested in config file? */
823  if (!AutoVacuumingActive())
825 
826  /* rebalance in case the default cost parameters changed */
827  LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
829  LWLockRelease(AutovacuumLock);
830 
831  /* rebuild the list in case the naptime changed */
833  }
834 
835  /* Process barrier events */
838 
839  /* Perform logging of memory contexts of this process */
842 
843  /* Process sinval catchup interrupts that happened while sleeping */
845 }
void ProcessCatchupInterrupt(void)
Definition: sinval.c:176
static void autovac_balance_cost(void)
Definition: autovacuum.c:1799
void ProcessLogMemoryContextInterrupt(void)
Definition: mcxt.c:1041
void ProcessConfigFile(GucContext context)
void ProcessProcSignalBarrier(void)
Definition: procsignal.c:453
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1803
bool AutoVacuumingActive(void)
Definition: autovacuum.c:3336
volatile sig_atomic_t ShutdownRequestPending
Definition: interrupt.c:27
Definition: guc.h:72
#define InvalidOid
Definition: postgres_ext.h:36
volatile sig_atomic_t LogMemoryContextPending
Definition: globals.c:38
volatile sig_atomic_t ProcSignalBarrierPending
Definition: globals.c:37
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1199
static void rebuild_database_list(Oid newdb)
Definition: autovacuum.c:952
static void AutoVacLauncherShutdown(void)
Definition: autovacuum.c:316
volatile sig_atomic_t ConfigReloadPending
Definition: interrupt.c:26

◆ IsAutoVacuumLauncherProcess()

bool IsAutoVacuumLauncherProcess ( void  )

Definition at line 3404 of file autovacuum.c.

References am_autovacuum_launcher.

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

3405 {
3406  return am_autovacuum_launcher;
3407 }
static bool am_autovacuum_launcher
Definition: autovacuum.c:140

◆ IsAutoVacuumWorkerProcess()

◆ launch_worker()

static void launch_worker ( TimestampTz  now)
static

Definition at line 1368 of file autovacuum.c.

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

Referenced by AutoVacLauncherMain().

1369 {
1370  Oid dbid;
1371  dlist_iter iter;
1372 
1373  dbid = do_start_worker();
1374  if (OidIsValid(dbid))
1375  {
1376  bool found = false;
1377 
1378  /*
1379  * Walk the database list and update the corresponding entry. If the
1380  * database is not on the list, we'll recreate the list.
1381  */
1382  dlist_foreach(iter, &DatabaseList)
1383  {
1384  avl_dbase *avdb = dlist_container(avl_dbase, adl_node, iter.cur);
1385 
1386  if (avdb->adl_datid == dbid)
1387  {
1388  found = true;
1389 
1390  /*
1391  * add autovacuum_naptime seconds to the current time, and use
1392  * that as the new "next_worker" field for this database.
1393  */
1394  avdb->adl_next_worker =
1396 
1398  break;
1399  }
1400  }
1401 
1402  /*
1403  * If the database was not present in the database list, we rebuild
1404  * the list. It's possible that the database does not get into the
1405  * list anyway, for example if it's a database that doesn't have a
1406  * pgstat entry, but this is not a problem because we don't want to
1407  * schedule workers regularly into those in any case.
1408  */
1409  if (!found)
1410  rebuild_database_list(dbid);
1411  }
1412 }
int autovacuum_naptime
Definition: autovacuum.c:117
TimestampTz adl_next_worker
Definition: autovacuum.c:163
#define dlist_foreach(iter, lhead)
Definition: ilist.h:526
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:710
#define dlist_container(type, membername, ptr)
Definition: ilist.h:496
Oid adl_datid
Definition: autovacuum.c:162
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:952
static Oid do_start_worker(void)
Definition: autovacuum.c:1153
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1544

◆ launcher_determine_sleep()

static void launcher_determine_sleep ( bool  canlaunch,
bool  recursing,
struct timeval *  nap 
)
static

Definition at line 868 of file autovacuum.c.

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

Referenced by AutoVacLauncherMain().

869 {
870  /*
871  * We sleep until the next scheduled vacuum. We trust that when the
872  * database list was built, care was taken so that no entries have times
873  * in the past; if the first entry has too close a next_worker value, or a
874  * time in the past, we will sleep a small nominal time.
875  */
876  if (!canlaunch)
877  {
878  nap->tv_sec = autovacuum_naptime;
879  nap->tv_usec = 0;
880  }
881  else if (!dlist_is_empty(&DatabaseList))
882  {
883  TimestampTz current_time = GetCurrentTimestamp();
884  TimestampTz next_wakeup;
885  avl_dbase *avdb;
886  long secs;
887  int usecs;
888 
889  avdb = dlist_tail_element(avl_dbase, adl_node, &DatabaseList);
890 
891  next_wakeup = avdb->adl_next_worker;
892  TimestampDifference(current_time, next_wakeup, &secs, &usecs);
893 
894  nap->tv_sec = secs;
895  nap->tv_usec = usecs;
896  }
897  else
898  {
899  /* list is empty, sleep for whole autovacuum_naptime seconds */
900  nap->tv_sec = autovacuum_naptime;
901  nap->tv_usec = 0;
902  }
903 
904  /*
905  * If the result is exactly zero, it means a database had an entry with
906  * time in the past. Rebuild the list so that the databases are evenly
907  * distributed again, and recalculate the time to sleep. This can happen
908  * if there are more tables needing vacuum than workers, and they all take
909  * longer to vacuum than autovacuum_naptime.
910  *
911  * We only recurse once. rebuild_database_list should always return times
912  * in the future, but it seems best not to trust too much on that.
913  */
914  if (nap->tv_sec == 0 && nap->tv_usec == 0 && !recursing)
915  {
917  launcher_determine_sleep(canlaunch, true, nap);
918  return;
919  }
920 
921  /* The smallest time we'll allow the launcher to sleep. */
922  if (nap->tv_sec <= 0 && nap->tv_usec <= MIN_AUTOVAC_SLEEPTIME * 1000)
923  {
924  nap->tv_sec = 0;
925  nap->tv_usec = MIN_AUTOVAC_SLEEPTIME * 1000;
926  }
927 
928  /*
929  * If the sleep time is too large, clamp it to an arbitrary maximum (plus
930  * any fractional seconds, for simplicity). This avoids an essentially
931  * infinite sleep in strange cases like the system clock going backwards a
932  * few years.
933  */
934  if (nap->tv_sec > MAX_AUTOVAC_SLEEPTIME)
935  nap->tv_sec = MAX_AUTOVAC_SLEEPTIME;
936 }
int autovacuum_naptime
Definition: autovacuum.c:117
TimestampTz adl_next_worker
Definition: autovacuum.c:163
#define MAX_AUTOVAC_SLEEPTIME
Definition: autovacuum.c:137
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1580
int64 TimestampTz
Definition: timestamp.h:39
#define MIN_AUTOVAC_SLEEPTIME
Definition: autovacuum.c:136
#define dlist_tail_element(type, membername, lhead)
Definition: ilist.h:515
static dlist_head DatabaseList
Definition: autovacuum.c:298
static void launcher_determine_sleep(bool canlaunch, bool recursing, struct timeval *nap)
Definition: autovacuum.c:868
#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:952
void TimestampDifference(TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
Definition: timestamp.c:1656

◆ perform_work_item()

static void perform_work_item ( AutoVacuumWorkItem workitem)
static

Definition at line 2639 of file autovacuum.c.

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

Referenced by do_autovacuum().

2640 {
2641  char *cur_datname = NULL;
2642  char *cur_nspname = NULL;
2643  char *cur_relname = NULL;
2644 
2645  /*
2646  * Note we do not store table info in MyWorkerInfo, since this is not
2647  * vacuuming proper.
2648  */
2649 
2650  /*
2651  * Save the relation name for a possible error message, to avoid a catalog
2652  * lookup in case of an error. If any of these return NULL, then the
2653  * relation has been dropped since last we checked; skip it.
2654  */
2656 
2657  cur_relname = get_rel_name(workitem->avw_relation);
2658  cur_nspname = get_namespace_name(get_rel_namespace(workitem->avw_relation));
2659  cur_datname = get_database_name(MyDatabaseId);
2660  if (!cur_relname || !cur_nspname || !cur_datname)
2661  goto deleted2;
2662 
2663  autovac_report_workitem(workitem, cur_nspname, cur_relname);
2664 
2665  /* clean up memory before each work item */
2667 
2668  /*
2669  * We will abort the current work item if something errors out, and
2670  * continue with the next one; in particular, this happens if we are
2671  * interrupted with SIGINT. Note that this means that the work item list
2672  * can be lossy.
2673  */
2674  PG_TRY();
2675  {
2676  /* Use PortalContext for any per-work-item allocations */
2678 
2679  /* have at it */
2680  switch (workitem->avw_type)
2681  {
2684  ObjectIdGetDatum(workitem->avw_relation),
2685  Int64GetDatum((int64) workitem->avw_blockNumber));
2686  break;
2687  default:
2688  elog(WARNING, "unrecognized work item found: type %d",
2689  workitem->avw_type);
2690  break;
2691  }
2692 
2693  /*
2694  * Clear a possible query-cancel signal, to avoid a late reaction to
2695  * an automatically-sent signal because of vacuuming the current table
2696  * (we're done with it, so it would make no sense to cancel at this
2697  * point.)
2698  */
2699  QueryCancelPending = false;
2700  }
2701  PG_CATCH();
2702  {
2703  /*
2704  * Abort the transaction, start a new one, and proceed with the next
2705  * table in our list.
2706  */
2707  HOLD_INTERRUPTS();
2708  errcontext("processing work entry for relation \"%s.%s.%s\"",
2709  cur_datname, cur_nspname, cur_relname);
2710  EmitErrorReport();
2711 
2712  /* this resets ProcGlobal->statusFlags[i] too */
2714  FlushErrorState();
2716 
2717  /* restart our transaction for the following operations */
2720  }
2721  PG_END_TRY();
2722 
2723  /* Make sure we're back in AutovacMemCxt */
2725 
2726  /* We intentionally do not set did_vacuum here */
2727 
2728  /* be tidy */
2729 deleted2:
2730  if (cur_datname)
2731  pfree(cur_datname);
2732  if (cur_nspname)
2733  pfree(cur_nspname);
2734  if (cur_relname)
2735  pfree(cur_relname);
2736 }
AutoVacuumWorkItemType avw_type
Definition: autovacuum.c:256
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
static MemoryContext AutovacMemCxt
Definition: autovacuum.c:157
Oid get_rel_namespace(Oid relid)
Definition: lsyscache.c:1923
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
void AbortOutOfAnyTransaction(void)
Definition: xact.c:4593
void FlushErrorState(void)
Definition: elog.c:1654
MemoryContext PortalContext
Definition: mcxt.c:57
Datum brin_summarize_range(PG_FUNCTION_ARGS)
Definition: brin.c:1002
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:133
void pfree(void *pointer)
Definition: mcxt.c:1169
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
char * get_database_name(Oid dbid)
Definition: dbcommands.c:2113
char * get_namespace_name(Oid nspid)
Definition: lsyscache.c:3316
static void autovac_report_workitem(AutoVacuumWorkItem *workitem, const char *nspname, const char *relname)
Definition: autovacuum.c:3296
MemoryContext CurrentMemoryContext
Definition: mcxt.c:42
Datum Int64GetDatum(int64 X)
Definition: fmgr.c:1697
#define WARNING
Definition: elog.h:40
#define MemoryContextResetAndDeleteChildren(ctx)
Definition: memutils.h:67
Oid MyDatabaseId
Definition: globals.c:88
BlockNumber avw_blockNumber
Definition: autovacuum.c:261
void EmitErrorReport(void)
Definition: elog.c:1509
#define PG_CATCH()
Definition: elog.h:323
#define Assert(condition)
Definition: c.h:804
void StartTransactionCommand(void)
Definition: xact.c:2852
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:131
#define elog(elevel,...)
Definition: elog.h:232
#define errcontext
Definition: elog.h:204
#define PG_TRY()
Definition: elog.h:313
char * get_rel_name(Oid relid)
Definition: lsyscache.c:1899
#define DirectFunctionCall2(func, arg1, arg2)
Definition: fmgr.h:628
#define PG_END_TRY()
Definition: elog.h:338

◆ rebuild_database_list()

static void rebuild_database_list ( Oid  newdb)
static

Definition at line 952 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, OidIsValid, palloc(), pgstat_fetch_stat_dbentry(), qsort, and TimestampTzPlusMilliseconds.

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

953 {
954  List *dblist;
955  ListCell *cell;
956  MemoryContext newcxt;
957  MemoryContext oldcxt;
958  MemoryContext tmpcxt;
959  HASHCTL hctl;
960  int score;
961  int nelems;
962  HTAB *dbhash;
963  dlist_iter iter;
964 
965  /* use fresh stats */
967 
969  "AV dblist",
971  tmpcxt = AllocSetContextCreate(newcxt,
972  "tmp AV dblist",
974  oldcxt = MemoryContextSwitchTo(tmpcxt);
975 
976  /*
977  * Implementing this is not as simple as it sounds, because we need to put
978  * the new database at the end of the list; next the databases that were
979  * already on the list, and finally (at the tail of the list) all the
980  * other databases that are not on the existing list.
981  *
982  * To do this, we build an empty hash table of scored databases. We will
983  * start with the lowest score (zero) for the new database, then
984  * increasing scores for the databases in the existing list, in order, and
985  * lastly increasing scores for all databases gotten via
986  * get_database_list() that are not already on the hash.
987  *
988  * Then we will put all the hash elements into an array, sort the array by
989  * score, and finally put the array elements into the new doubly linked
990  * list.
991  */
992  hctl.keysize = sizeof(Oid);
993  hctl.entrysize = sizeof(avl_dbase);
994  hctl.hcxt = tmpcxt;
995  dbhash = hash_create("db hash", 20, &hctl, /* magic number here FIXME */
997 
998  /* start by inserting the new database */
999  score = 0;
1000  if (OidIsValid(newdb))
1001  {
1002  avl_dbase *db;
1003  PgStat_StatDBEntry *entry;
1004 
1005  /* only consider this database if it has a pgstat entry */
1006  entry = pgstat_fetch_stat_dbentry(newdb);
1007  if (entry != NULL)
1008  {
1009  /* we assume it isn't found because the hash was just created */
1010  db = hash_search(dbhash, &newdb, HASH_ENTER, NULL);
1011 
1012  /* hash_search already filled in the key */
1013  db->adl_score = score++;
1014  /* next_worker is filled in later */
1015  }
1016  }
1017 
1018  /* Now insert the databases from the existing list */
1019  dlist_foreach(iter, &DatabaseList)
1020  {
1021  avl_dbase *avdb = dlist_container(avl_dbase, adl_node, iter.cur);
1022  avl_dbase *db;
1023  bool found;
1024  PgStat_StatDBEntry *entry;
1025 
1026  /*
1027  * skip databases with no stat entries -- in particular, this gets rid
1028  * of dropped databases
1029  */
1030  entry = pgstat_fetch_stat_dbentry(avdb->adl_datid);
1031  if (entry == NULL)
1032  continue;
1033 
1034  db = hash_search(dbhash, &(avdb->adl_datid), HASH_ENTER, &found);
1035 
1036  if (!found)
1037  {
1038  /* hash_search already filled in the key */
1039  db->adl_score = score++;
1040  /* next_worker is filled in later */
1041  }
1042  }
1043 
1044  /* finally, insert all qualifying databases not previously inserted */
1045  dblist = get_database_list();
1046  foreach(cell, dblist)
1047  {
1048  avw_dbase *avdb = lfirst(cell);
1049  avl_dbase *db;
1050  bool found;
1051  PgStat_StatDBEntry *entry;
1052 
1053  /* only consider databases with a pgstat entry */
1054  entry = pgstat_fetch_stat_dbentry(avdb->adw_datid);
1055  if (entry == NULL)
1056  continue;
1057 
1058  db = hash_search(dbhash, &(avdb->adw_datid), HASH_ENTER, &found);
1059  /* only update the score if the database was not already on the hash */
1060  if (!found)
1061  {
1062  /* hash_search already filled in the key */
1063  db->adl_score = score++;
1064  /* next_worker is filled in later */
1065  }
1066  }
1067  nelems = score;
1068 
1069  /* from here on, the allocated memory belongs to the new list */
1070  MemoryContextSwitchTo(newcxt);
1072 
1073  if (nelems > 0)
1074  {
1075  TimestampTz current_time;
1076  int millis_increment;
1077  avl_dbase *dbary;
1078  avl_dbase *db;
1079  HASH_SEQ_STATUS seq;
1080  int i;
1081 
1082  /* put all the hash elements into an array */
1083  dbary = palloc(nelems * sizeof(avl_dbase));
1084 
1085  i = 0;
1086  hash_seq_init(&seq, dbhash);
1087  while ((db = hash_seq_search(&seq)) != NULL)
1088  memcpy(&(dbary[i++]), db, sizeof(avl_dbase));
1089 
1090  /* sort the array */
1091  qsort(dbary, nelems, sizeof(avl_dbase), db_comparator);
1092 
1093  /*
1094  * Determine the time interval between databases in the schedule. If
1095  * we see that the configured naptime would take us to sleep times
1096  * lower than our min sleep time (which launcher_determine_sleep is
1097  * coded not to allow), silently use a larger naptime (but don't touch
1098  * the GUC variable).
1099  */
1100  millis_increment = 1000.0 * autovacuum_naptime / nelems;
1101  if (millis_increment <= MIN_AUTOVAC_SLEEPTIME)
1102  millis_increment = MIN_AUTOVAC_SLEEPTIME * 1.1;
1103 
1104  current_time = GetCurrentTimestamp();
1105 
1106  /*
1107  * move the elements from the array into the dlist, setting the
1108  * next_worker while walking the array
1109  */
1110  for (i = 0; i < nelems; i++)
1111  {
1112  avl_dbase *db = &(dbary[i]);
1113 
1114  current_time = TimestampTzPlusMilliseconds(current_time,
1115  millis_increment);
1116  db->adl_next_worker = current_time;
1117 
1118  /* later elements should go closer to the head of the list */
1120  }
1121  }
1122 
1123  /* all done, clean up memory */
1124  if (DatabaseListCxt != NULL)
1126  MemoryContextDelete(tmpcxt);
1127  DatabaseListCxt = newcxt;
1128  MemoryContextSwitchTo(oldcxt);
1129 }
int autovacuum_naptime
Definition: autovacuum.c:117
TimestampTz adl_next_worker
Definition: autovacuum.c:163
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:218
#define AllocSetContextCreate
Definition: memutils.h:173
#define HASH_CONTEXT
Definition: hsearch.h:102
#define HASH_ELEM
Definition: hsearch.h:95
MemoryContext hcxt
Definition: hsearch.h:86
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1580
int64 TimestampTz
Definition: timestamp.h:39
#define dlist_foreach(iter, lhead)
Definition: ilist.h:526
int adl_score
Definition: autovacuum.c:164
static MemoryContext AutovacMemCxt
Definition: autovacuum.c:157
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
Size entrysize
Definition: hsearch.h:76
struct avl_dbase avl_dbase
static void autovac_refresh_stats(void)
Definition: autovacuum.c:3488
PgStat_StatDBEntry * pgstat_fetch_stat_dbentry(Oid dbid)
Definition: pgstat.c:2774
#define MIN_AUTOVAC_SLEEPTIME
Definition: autovacuum.c:136
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:954
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:710
Definition: dynahash.c:219
#define dlist_container(type, membername, ptr)
Definition: ilist.h:496
Oid adl_datid
Definition: autovacuum.c:162
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:195
_stringlist * dblist
Definition: pg_regress.c:75
HTAB * hash_create(const char *tabname, long nelem, const HASHCTL *info, int flags)
Definition: dynahash.c:349
static dlist_head DatabaseList
Definition: autovacuum.c:298
static int db_comparator(const void *a, const void *b)
Definition: autovacuum.c:1133
#define HASH_BLOBS
Definition: hsearch.h:97
Oid adw_datid
Definition: autovacuum.c:171
Size keysize
Definition: hsearch.h:75
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 lfirst(lc)
Definition: pg_list.h:169
void * hash_seq_search(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1436
void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp)
Definition: dynahash.c:1426
static List * get_database_list(void)
Definition: autovacuum.c:1887
dlist_node adl_node
Definition: autovacuum.c:165
void * palloc(Size size)
Definition: mcxt.c:1062
static MemoryContext DatabaseListCxt
Definition: autovacuum.c:299
int i
#define qsort(a, b, c, d)
Definition: port.h:505
Definition: pg_list.h:50

◆ recheck_relation_needs_vacanalyze()

static void recheck_relation_needs_vacanalyze ( Oid  relid,
AutoVacOpts avopts,
Form_pg_class  classForm,
int  effective_multixact_freeze_max_age,
bool dovacuum,
bool doanalyze,
bool wraparound 
)
static

Definition at line 2994 of file autovacuum.c.

References get_pgstat_tabentry_relid(), InvalidOid, MyDatabaseId, pgstat_fetch_stat_dbentry(), and relation_needs_vacanalyze().

Referenced by table_recheck_autovac().

3001 {
3002  PgStat_StatTabEntry *tabentry;
3003  PgStat_StatDBEntry *shared = NULL;
3004  PgStat_StatDBEntry *dbentry = NULL;
3005 
3006  if (classForm->relisshared)
3008  else
3010 
3011  /* fetch the pgstat table entry */
3012  tabentry = get_pgstat_tabentry_relid(relid, classForm->relisshared,
3013  shared, dbentry);
3014 
3015  relation_needs_vacanalyze(relid, avopts, classForm, tabentry,
3016  effective_multixact_freeze_max_age,
3017  dovacuum, doanalyze, wraparound);
3018 
3019  /* ignore ANALYZE for toast tables */
3020  if (classForm->relkind == RELKIND_TOASTVALUE)
3021  *doanalyze = false;
3022 }
PgStat_StatDBEntry * pgstat_fetch_stat_dbentry(Oid dbid)
Definition: pgstat.c:2774
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:3062
Oid MyDatabaseId
Definition: globals.c:88
#define InvalidOid
Definition: postgres_ext.h:36
static PgStat_StatTabEntry * get_pgstat_tabentry_relid(Oid relid, bool isshared, PgStat_StatDBEntry *shared, PgStat_StatDBEntry *dbentry)
Definition: autovacuum.c:2776

◆ relation_needs_vacanalyze()

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 3062 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_ins_scale, autovacuum_vac_ins_thresh, autovacuum_vac_scale, autovacuum_vac_thresh, AutoVacuumingActive(), PgStat_StatTabEntry::changes_since_analyze, DEBUG3, elog, AutoVacOpts::enabled, FirstMultiXactId, FirstNormalTransactionId, AutoVacOpts::freeze_max_age, PgStat_StatTabEntry::inserts_since_vacuum, Min, AutoVacOpts::multixact_freeze_max_age, MultiXactIdIsValid, MultiXactIdPrecedes(), PgStat_StatTabEntry::n_dead_tuples, NameStr, OidIsValid, PointerIsValid, recentMulti, recentXid, TransactionIdIsNormal, TransactionIdPrecedes(), AutoVacOpts::vacuum_ins_scale_factor, AutoVacOpts::vacuum_ins_threshold, AutoVacOpts::vacuum_scale_factor, and AutoVacOpts::vacuum_threshold.

Referenced by do_autovacuum(), and recheck_relation_needs_vacanalyze().

3071 {
3072  bool force_vacuum;
3073  bool av_enabled;
3074  float4 reltuples; /* pg_class.reltuples */
3075 
3076  /* constants from reloptions or GUC variables */
3077  int vac_base_thresh,
3078  vac_ins_base_thresh,
3079  anl_base_thresh;
3080  float4 vac_scale_factor,
3081  vac_ins_scale_factor,
3082  anl_scale_factor;
3083 
3084  /* thresholds calculated from above constants */
3085  float4 vacthresh,
3086  vacinsthresh,
3087  anlthresh;
3088 
3089  /* number of vacuum (resp. analyze) tuples at this time */
3090  float4 vactuples,
3091  instuples,
3092  anltuples;
3093 
3094  /* freeze parameters */
3095  int freeze_max_age;
3096  int multixact_freeze_max_age;
3097  TransactionId xidForceLimit;
3098  MultiXactId multiForceLimit;
3099 
3100  AssertArg(classForm != NULL);
3101  AssertArg(OidIsValid(relid));
3102 
3103  /*
3104  * Determine vacuum/analyze equation parameters. We have two possible
3105  * sources: the passed reloptions (which could be a main table or a toast
3106  * table), or the autovacuum GUC variables.
3107  */
3108 
3109  /* -1 in autovac setting means use plain vacuum_scale_factor */
3110  vac_scale_factor = (relopts && relopts->vacuum_scale_factor >= 0)
3111  ? relopts->vacuum_scale_factor
3113 
3114  vac_base_thresh = (relopts && relopts->vacuum_threshold >= 0)
3115  ? relopts->vacuum_threshold
3117 
3118  vac_ins_scale_factor = (relopts && relopts->vacuum_ins_scale_factor >= 0)
3119  ? relopts->vacuum_ins_scale_factor
3121 
3122  /* -1 is used to disable insert vacuums */
3123  vac_ins_base_thresh = (relopts && relopts->vacuum_ins_threshold >= -1)
3124  ? relopts->vacuum_ins_threshold
3126 
3127  anl_scale_factor = (relopts && relopts->analyze_scale_factor >= 0)
3128  ? relopts->analyze_scale_factor
3130 
3131  anl_base_thresh = (relopts && relopts->analyze_threshold >= 0)
3132  ? relopts->analyze_threshold
3134 
3135  freeze_max_age = (relopts && relopts->freeze_max_age >= 0)
3138 
3139  multixact_freeze_max_age = (relopts && relopts->multixact_freeze_max_age >= 0)
3140  ? Min(relopts->multixact_freeze_max_age, effective_multixact_freeze_max_age)
3141  : effective_multixact_freeze_max_age;
3142 
3143  av_enabled = (relopts ? relopts->enabled : true);
3144 
3145  /* Force vacuum if table is at risk of wraparound */
3146  xidForceLimit = recentXid - freeze_max_age;
3147  if (xidForceLimit < FirstNormalTransactionId)
3148  xidForceLimit -= FirstNormalTransactionId;
3149  force_vacuum = (TransactionIdIsNormal(classForm->relfrozenxid) &&
3150  TransactionIdPrecedes(classForm->relfrozenxid,
3151  xidForceLimit));
3152  if (!force_vacuum)
3153  {
3154  multiForceLimit = recentMulti - multixact_freeze_max_age;
3155  if (multiForceLimit < FirstMultiXactId)
3156  multiForceLimit -= FirstMultiXactId;
3157  force_vacuum = MultiXactIdIsValid(classForm->relminmxid) &&
3158  MultiXactIdPrecedes(classForm->relminmxid, multiForceLimit);
3159  }
3160  *wraparound = force_vacuum;
3161 
3162  /* User disabled it in pg_class.reloptions? (But ignore if at risk) */
3163  if (!av_enabled && !force_vacuum)
3164  {
3165  *doanalyze = false;
3166  *dovacuum = false;
3167  return;
3168  }
3169 
3170  /*
3171  * If we found the table in the stats hash, and autovacuum is currently
3172  * enabled, make a threshold-based decision whether to vacuum and/or
3173  * analyze. If autovacuum is currently disabled, we must be here for
3174  * anti-wraparound vacuuming only, so don't vacuum (or analyze) anything
3175  * that's not being forced.
3176  */
3177  if (PointerIsValid(tabentry) && AutoVacuumingActive())
3178  {
3179  reltuples = classForm->reltuples;
3180  vactuples = tabentry->n_dead_tuples;
3181  instuples = tabentry->inserts_since_vacuum;
3182  anltuples = tabentry->changes_since_analyze;
3183 
3184  /* If the table hasn't yet been vacuumed, take reltuples as zero */
3185  if (reltuples < 0)
3186  reltuples = 0;
3187 
3188  vacthresh = (float4) vac_base_thresh + vac_scale_factor * reltuples;
3189  vacinsthresh = (float4) vac_ins_base_thresh + vac_ins_scale_factor * reltuples;
3190  anlthresh = (float4) anl_base_thresh + anl_scale_factor * reltuples;
3191 
3192  /*
3193  * Note that we don't need to take special consideration for stat
3194  * reset, because if that happens, the last vacuum and analyze counts
3195  * will be reset too.
3196  */
3197  if (vac_ins_base_thresh >= 0)
3198  elog(DEBUG3, "%s: vac: %.0f (threshold %.0f), ins: %.0f (threshold %.0f), anl: %.0f (threshold %.0f)",
3199  NameStr(classForm->relname),
3200  vactuples, vacthresh, instuples, vacinsthresh, anltuples, anlthresh);
3201  else
3202  elog(DEBUG3, "%s: vac: %.0f (threshold %.0f), ins: (disabled), anl: %.0f (threshold %.0f)",
3203  NameStr(classForm->relname),
3204  vactuples, vacthresh, anltuples, anlthresh);
3205 
3206  /* Determine if this table needs vacuum or analyze. */
3207  *dovacuum = force_vacuum || (vactuples > vacthresh) ||
3208  (vac_ins_base_thresh >= 0 && instuples > vacinsthresh);
3209  *doanalyze = (anltuples > anlthresh);
3210  }
3211  else
3212  {
3213  /*
3214  * Skip a table not found in stat hash, unless we have to force vacuum
3215  * for anti-wrap purposes. If it's not acted upon, there's no need to
3216  * vacuum it.
3217  */
3218  *dovacuum = force_vacuum;
3219  *doanalyze = false;
3220  }
3221 
3222  /* ANALYZE refuses to work with pg_statistic */
3223  if (relid == StatisticRelationId)
3224  *doanalyze = false;
3225 }
double autovacuum_anl_scale
Definition: autovacuum.c:123
int autovacuum_vac_ins_thresh
Definition: autovacuum.c:120
uint32 TransactionId
Definition: c.h:587
#define DEBUG3
Definition: elog.h:23
float8 vacuum_scale_factor
Definition: rel.h:305
#define Min(x, y)
Definition: c.h:986
static MultiXactId recentMulti
Definition: autovacuum.c:148
#define OidIsValid(objectId)
Definition: c.h:710
double autovacuum_vac_ins_scale
Definition: autovacuum.c:121
PgStat_Counter inserts_since_vacuum
Definition: pgstat.h:800
#define FirstNormalTransactionId
Definition: transam.h:34
bool AutoVacuumingActive(void)
Definition: autovacuum.c:3336
int autovacuum_freeze_max_age
Definition: autovacuum.c:124
PgStat_Counter n_dead_tuples
Definition: pgstat.h:798
int analyze_threshold
Definition: rel.h:295
int autovacuum_vac_thresh
Definition: autovacuum.c:118
#define MultiXactIdIsValid(multi)
Definition: multixact.h:28
#define FirstMultiXactId
Definition: multixact.h:25
#define AssertArg(condition)
Definition: c.h:806
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:300
float float4
Definition: c.h:564
int vacuum_threshold
Definition: rel.h:293
static TransactionId recentXid
Definition: autovacuum.c:147
PgStat_Counter changes_since_analyze
Definition: pgstat.h:799
double autovacuum_vac_scale
Definition: autovacuum.c:119
float8 analyze_scale_factor
Definition: rel.h:307
TransactionId MultiXactId
Definition: c.h:597
int freeze_max_age
Definition: rel.h:298
bool enabled
Definition: rel.h:292
bool MultiXactIdPrecedes(MultiXactId multi1, MultiXactId multi2)
Definition: multixact.c:3159
int vacuum_ins_threshold
Definition: rel.h:294
#define elog(elevel,...)
Definition: elog.h:232
#define NameStr(name)
Definition: c.h:681
int multixact_freeze_max_age
Definition: rel.h:301
float8 vacuum_ins_scale_factor
Definition: rel.h:306
#define TransactionIdIsNormal(xid)
Definition: transam.h:42
#define PointerIsValid(pointer)
Definition: c.h:698
int autovacuum_anl_thresh
Definition: autovacuum.c:122

◆ StartAutoVacWorker()

int StartAutoVacWorker ( void  )

Definition at line 1480 of file autovacuum.c.

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

Referenced by StartAutovacuumWorker().

1481 {
1482  pid_t worker_pid;
1483 
1484 #ifdef EXEC_BACKEND
1485  switch ((worker_pid = avworker_forkexec()))
1486 #else
1487  switch ((worker_pid = fork_process()))
1488 #endif
1489  {
1490  case -1:
1491  ereport(LOG,
1492  (errmsg("could not fork autovacuum worker process: %m")));
1493  return 0;
1494 
1495 #ifndef EXEC_BACKEND
1496  case 0:
1497  /* in postmaster child ... */
1499 
1500  /* Close the postmaster's sockets */
1501  ClosePostmasterPorts(false);
1502 
1503  AutoVacWorkerMain(0, NULL);
1504  break;
1505 #endif
1506  default:
1507  return (int) worker_pid;
1508  }
1509 
1510  /* shouldn't get here */
1511  return 0;
1512 }
void InitPostmasterChild(void)
Definition: miscinit.c:94
pid_t fork_process(void)
Definition: fork_process.c:29
#define LOG
Definition: elog.h:26
NON_EXEC_STATIC void AutoVacWorkerMain(int argc, char *argv[]) pg_attribute_noreturn()
Definition: autovacuum.c:1518
void ClosePostmasterPorts(bool am_syslogger)
Definition: postmaster.c:2612
#define ereport(elevel,...)
Definition: elog.h:157
int errmsg(const char *fmt,...)
Definition: elog.c:909

◆ table_recheck_autovac()

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 2803 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_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, GETSTRUCT, HASH_FIND, hash_search(), heap_freetuple(), HeapTupleIsValid, VacuumParams::index_cleanup, 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, VacuumParams::nworkers, ObjectIdGetDatum, VacuumParams::options, palloc(), recheck_relation_needs_vacanalyze(), RELOID, SearchSysCacheCopy1, VacuumParams::truncate, VACOPT_ANALYZE, VACOPT_SKIP_LOCKED, VACOPT_VACUUM, VACOPTVALUE_UNSPECIFIED, AutoVacOpts::vacuum_cost_delay, AutoVacOpts::vacuum_cost_limit, VacuumCostDelay, and VacuumCostLimit.

Referenced by do_autovacuum().

2806 {
2807  Form_pg_class classForm;
2808  HeapTuple classTup;
2809  bool dovacuum;
2810  bool doanalyze;
2811  autovac_table *tab = NULL;
2812  bool wraparound;
2813  AutoVacOpts *avopts;
2814  static bool reuse_stats = false;
2815 
2816  /* fetch the relation's relcache entry */
2817  classTup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
2818  if (!HeapTupleIsValid(classTup))
2819  return NULL;
2820  classForm = (Form_pg_class) GETSTRUCT(classTup);
2821 
2822  /*
2823  * Get the applicable reloptions. If it is a TOAST table, try to get the
2824  * main table reloptions if the toast table itself doesn't have.
2825  */
2826  avopts = extract_autovac_opts(classTup, pg_class_desc);
2827  if (classForm->relkind == RELKIND_TOASTVALUE &&
2828  avopts == NULL && table_toast_map != NULL)
2829  {
2830  av_relation *hentry;
2831  bool found;
2832 
2833  hentry = hash_search(table_toast_map, &relid, HASH_FIND, &found);
2834  if (found && hentry->ar_hasrelopts)
2835  avopts = &hentry->ar_reloptions;
2836  }
2837 
2838  /*
2839  * Reuse the stats to recheck whether a relation needs to be vacuumed or
2840  * analyzed if it was reloaded before and has not been cleared yet. This
2841  * is necessary to avoid frequent refresh of stats, especially when there
2842  * are very large number of relations and the refresh can cause lots of
2843  * overhead.
2844  *
2845  * If we determined that a relation needs to be vacuumed or analyzed,
2846  * based on the old stats, we refresh stats and recheck the necessity
2847  * again. Because a relation may have already been vacuumed or analyzed by
2848  * someone since the last reload of stats.
2849  */
2850  if (reuse_stats)
2851  {
2852  recheck_relation_needs_vacanalyze(relid, avopts, classForm,
2853  effective_multixact_freeze_max_age,
2854  &dovacuum, &doanalyze, &wraparound);
2855 
2856  /* Quick exit if a relation doesn't need to be vacuumed or analyzed */
2857  if (!doanalyze && !dovacuum)
2858  {
2859  heap_freetuple(classTup);
2860  return NULL;
2861  }
2862  }
2863 
2864  /* Use fresh stats and recheck again */
2866 
2867  recheck_relation_needs_vacanalyze(relid, avopts, classForm,
2868  effective_multixact_freeze_max_age,
2869  &dovacuum, &doanalyze, &wraparound);
2870 
2871  /* OK, it needs something done */
2872  if (doanalyze || dovacuum)
2873  {
2874  int freeze_min_age;
2875  int freeze_table_age;
2876  int multixact_freeze_min_age;
2877  int multixact_freeze_table_age;
2878  int vac_cost_limit;
2879  double vac_cost_delay;
2880  int log_min_duration;
2881 
2882  /*
2883  * Calculate the vacuum cost parameters and the freeze ages. If there
2884  * are options set in pg_class.reloptions, use them; in the case of a
2885  * toast table, try the main table too. Otherwise use the GUC
2886  * defaults, autovacuum's own first and plain vacuum second.
2887  */
2888 
2889  /* -1 in autovac setting means use plain vacuum_cost_delay */
2890  vac_cost_delay = (avopts && avopts->vacuum_cost_delay >= 0)
2891  ? avopts->vacuum_cost_delay
2892  : (autovacuum_vac_cost_delay >= 0)
2894  : VacuumCostDelay;
2895 
2896  /* 0 or -1 in autovac setting means use plain vacuum_cost_limit */
2897  vac_cost_limit = (avopts && avopts->vacuum_cost_limit > 0)
2898  ? avopts->vacuum_cost_limit
2901  : VacuumCostLimit;
2902 
2903  /* -1 in autovac setting means use log_autovacuum_min_duration */
2904  log_min_duration = (avopts && avopts->log_min_duration >= 0)
2905  ? avopts->log_min_duration
2907 
2908  /* these do not have autovacuum-specific settings */
2909  freeze_min_age = (avopts && avopts->freeze_min_age >= 0)
2910  ? avopts->freeze_min_age
2912 
2913  freeze_table_age = (avopts && avopts->freeze_table_age >= 0)
2914  ? avopts->freeze_table_age
2916 
2917  multixact_freeze_min_age = (avopts &&
2918  avopts->multixact_freeze_min_age >= 0)
2919  ? avopts->multixact_freeze_min_age
2921 
2922  multixact_freeze_table_age = (avopts &&
2923  avopts->multixact_freeze_table_age >= 0)
2924  ? avopts->multixact_freeze_table_age
2926 
2927  tab = palloc(sizeof(autovac_table));
2928  tab->at_relid = relid;
2929  tab->at_sharedrel = classForm->relisshared;
2930 
2931  /* Note that this skips toast relations */
2932  tab->at_params.options = (dovacuum ? VACOPT_VACUUM : 0) |
2933  (doanalyze ? VACOPT_ANALYZE : 0) |
2934  (!wraparound ? VACOPT_SKIP_LOCKED : 0);
2935 
2936  /*
2937  * index_cleanup and truncate are unspecified at first in autovacuum.
2938  * They will be filled in with usable values using their reloptions
2939  * (or reloption defaults) later.
2940  */
2943  /* As of now, we don't support parallel vacuum for autovacuum */
2944  tab->at_params.nworkers = -1;
2945  tab->at_params.freeze_min_age = freeze_min_age;
2946  tab->at_params.freeze_table_age = freeze_table_age;
2947  tab->at_params.multixact_freeze_min_age = multixact_freeze_min_age;
2948  tab->at_params.multixact_freeze_table_age = multixact_freeze_table_age;
2949  tab->at_params.is_wraparound = wraparound;
2950  tab->at_params.log_min_duration = log_min_duration;
2951  tab->at_vacuum_cost_limit = vac_cost_limit;
2952  tab->at_vacuum_cost_delay = vac_cost_delay;
2953  tab->at_relname = NULL;
2954  tab->at_nspname = NULL;
2955  tab->at_datname = NULL;
2956 
2957  /*
2958  * If any of the cost delay parameters has been set individually for
2959  * this table, disable the balancing algorithm.
2960  */
2961  tab->at_dobalance =
2962  !(avopts && (avopts->vacuum_cost_limit > 0 ||
2963  avopts->vacuum_cost_delay > 0));
2964 
2965  /*
2966  * When we decide to do vacuum or analyze, the existing stats cannot
2967  * be reused in the next cycle because it's cleared at the end of
2968  * vacuum or analyze (by AtEOXact_PgStat()).
2969  */
2970  reuse_stats = false;
2971  }
2972  else
2973  {
2974  /*
2975  * If neither vacuum nor analyze is necessary, the existing stats is
2976  * not cleared and can be reused in the next cycle.
2977  */
2978  reuse_stats = true;
2979  }
2980 
2981  heap_freetuple(classTup);
2982  return tab;
2983 }
int multixact_freeze_table_age
Definition: vacuum.h:216
static int default_freeze_table_age
Definition: autovacuum.c:152
#define GETSTRUCT(TUP)
Definition: htup_details.h:654
static AutoVacOpts * extract_autovac_opts(HeapTuple tup, TupleDesc pg_class_desc)
Definition: autovacuum.c:2750
static int default_multixact_freeze_min_age
Definition: autovacuum.c:153
#define VACOPT_ANALYZE
Definition: vacuum.h:179
int freeze_min_age
Definition: rel.h:297
static void autovac_refresh_stats(void)
Definition: autovacuum.c:3488
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:954
VacOptValue truncate
Definition: vacuum.h:223
char * at_datname
Definition: autovacuum.c:199
void heap_freetuple(HeapTuple htup)
Definition: heaptuple.c:1338
int freeze_table_age
Definition: vacuum.h:213
int autovacuum_vac_cost_limit
Definition: autovacuum.c:128
bool at_sharedrel
Definition: autovacuum.c:196
static void recheck_relation_needs_vacanalyze(Oid relid, AutoVacOpts *avopts, Form_pg_class classForm, int effective_multixact_freeze_max_age, bool *dovacuum, bool *doanalyze, bool *wraparound)
Definition: autovacuum.c:2994
int freeze_table_age
Definition: rel.h:299
int at_vacuum_cost_limit
Definition: autovacuum.c:194
char * at_relname
Definition: autovacuum.c:197
bits32 options
Definition: vacuum.h:211
#define ObjectIdGetDatum(X)
Definition: postgres.h:551
int VacuumCostLimit
Definition: globals.c:144
int freeze_min_age
Definition: vacuum.h:212
float8 vacuum_cost_delay
Definition: rel.h:304
bool is_wraparound
Definition: vacuum.h:218
double autovacuum_vac_cost_delay
Definition: autovacuum.c:127
VacOptValue index_cleanup
Definition: vacuum.h:222
char * at_nspname
Definition: autovacuum.c:198
int multixact_freeze_table_age
Definition: rel.h:302
double at_vacuum_cost_delay
Definition: autovacuum.c:193
VacuumParams at_params
Definition: autovacuum.c:192
int vacuum_cost_limit
Definition: rel.h:296
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define VACOPT_VACUUM
Definition: vacuum.h:178
int multixact_freeze_min_age
Definition: rel.h:300
int nworkers
Definition: vacuum.h:230
int log_min_duration
Definition: vacuum.h:219
int log_min_duration
Definition: rel.h:303
int Log_autovacuum_min_duration
Definition: autovacuum.c:130
FormData_pg_class * Form_pg_class
Definition: pg_class.h:153
#define SearchSysCacheCopy1(cacheId, key1)
Definition: syscache.h:175
AutoVacOpts ar_reloptions
Definition: autovacuum.c:184
void * palloc(Size size)
Definition: mcxt.c:1062
double VacuumCostDelay
Definition: globals.c:145
#define VACOPT_SKIP_LOCKED
Definition: vacuum.h:183
bool ar_hasrelopts
Definition: autovacuum.c:183
static int default_multixact_freeze_table_age
Definition: autovacuum.c:154
int multixact_freeze_min_age
Definition: vacuum.h:214
static int default_freeze_min_age
Definition: autovacuum.c:151
bool at_dobalance
Definition: autovacuum.c:195

Variable Documentation

◆ am_autovacuum_launcher

bool am_autovacuum_launcher = false
static

Definition at line 140 of file autovacuum.c.

Referenced by AutoVacLauncherMain(), and IsAutoVacuumLauncherProcess().

◆ am_autovacuum_worker

bool am_autovacuum_worker = false
static

Definition at line 141 of file autovacuum.c.

Referenced by AutoVacWorkerMain(), avl_sigusr2_handler(), and IsAutoVacuumWorkerProcess().

◆ AutovacMemCxt

MemoryContext AutovacMemCxt
static

Definition at line 157 of file autovacuum.c.

◆ autovacuum_anl_scale

double autovacuum_anl_scale

Definition at line 123 of file autovacuum.c.

Referenced by relation_needs_vacanalyze().

◆ autovacuum_anl_thresh

int autovacuum_anl_thresh

Definition at line 122 of file autovacuum.c.

Referenced by relation_needs_vacanalyze().

◆ autovacuum_freeze_max_age

int autovacuum_freeze_max_age

◆ autovacuum_max_workers

◆ autovacuum_multixact_freeze_max_age

int autovacuum_multixact_freeze_max_age

◆ autovacuum_naptime

int autovacuum_naptime

◆ autovacuum_start_daemon

bool autovacuum_start_daemon = false

Definition at line 114 of file autovacuum.c.

Referenced by autovac_init(), and AutoVacuumingActive().

◆ autovacuum_vac_cost_delay

double autovacuum_vac_cost_delay

Definition at line 127 of file autovacuum.c.

Referenced by autovac_balance_cost(), and table_recheck_autovac().

◆ autovacuum_vac_cost_limit

int autovacuum_vac_cost_limit

Definition at line 128 of file autovacuum.c.

Referenced by autovac_balance_cost(), and table_recheck_autovac().

◆ autovacuum_vac_ins_scale

double autovacuum_vac_ins_scale

Definition at line 121 of file autovacuum.c.

Referenced by relation_needs_vacanalyze().

◆ autovacuum_vac_ins_thresh

int autovacuum_vac_ins_thresh

Definition at line 120 of file autovacuum.c.

Referenced by relation_needs_vacanalyze().

◆ autovacuum_vac_scale

double autovacuum_vac_scale

Definition at line 119 of file autovacuum.c.

Referenced by relation_needs_vacanalyze().

◆ autovacuum_vac_thresh

int autovacuum_vac_thresh

Definition at line 118 of file autovacuum.c.

Referenced by relation_needs_vacanalyze().

◆ autovacuum_work_mem

int autovacuum_work_mem = -1

Definition at line 116 of file autovacuum.c.

Referenced by compute_max_dead_tuples(), and ginInsertCleanup().

◆ AutovacuumLauncherPid

int AutovacuumLauncherPid = 0

Definition at line 305 of file autovacuum.c.

Referenced by FreeWorkerInfo(), and ProcKill().

◆ AutoVacuumShmem

AutoVacuumShmemStruct* AutoVacuumShmem
static

Definition at line 292 of file autovacuum.c.

◆ DatabaseList

dlist_head DatabaseList = DLIST_STATIC_INIT(DatabaseList)
static

Definition at line 298 of file autovacuum.c.

◆ DatabaseListCxt

MemoryContext DatabaseListCxt = NULL
static

Definition at line 299 of file autovacuum.c.

◆ default_freeze_min_age

int default_freeze_min_age
static

Definition at line 151 of file autovacuum.c.

Referenced by do_autovacuum(), and table_recheck_autovac().

◆ default_freeze_table_age

int default_freeze_table_age
static

Definition at line 152 of file autovacuum.c.

Referenced by do_autovacuum(), and table_recheck_autovac().

◆ default_multixact_freeze_min_age

int default_multixact_freeze_min_age
static

Definition at line 153 of file autovacuum.c.

Referenced by do_autovacuum(), and table_recheck_autovac().

◆ default_multixact_freeze_table_age

int default_multixact_freeze_table_age
static

Definition at line 154 of file autovacuum.c.

Referenced by do_autovacuum(), and table_recheck_autovac().

◆ got_SIGUSR2

volatile sig_atomic_t got_SIGUSR2 = false
static

Definition at line 144 of file autovacuum.c.

Referenced by AutoVacLauncherMain(), and avl_sigusr2_handler().

◆ Log_autovacuum_min_duration

int Log_autovacuum_min_duration = -1

Definition at line 130 of file autovacuum.c.

Referenced by table_recheck_autovac().

◆ MyWorkerInfo

WorkerInfo MyWorkerInfo = NULL
static

Definition at line 302 of file autovacuum.c.

◆ recentMulti

MultiXactId recentMulti
static

Definition at line 148 of file autovacuum.c.

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

◆ recentXid

TransactionId recentXid
static

Definition at line 147 of file autovacuum.c.

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