Age Owner Branch data TLA Line data Source code
1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * autovacuum.c
4 : : *
5 : : * PostgreSQL Integrated Autovacuum Daemon
6 : : *
7 : : * The autovacuum system is structured in two different kinds of processes: the
8 : : * autovacuum launcher and the autovacuum worker. The launcher is an
9 : : * always-running process, started by the postmaster when the autovacuum GUC
10 : : * parameter is set. The launcher schedules autovacuum workers to be started
11 : : * when appropriate. The workers are the processes which execute the actual
12 : : * vacuuming; they connect to a database as determined in the launcher, and
13 : : * once connected they examine the catalogs to select the tables to vacuum.
14 : : *
15 : : * The autovacuum launcher cannot start the worker processes by itself,
16 : : * because doing so would cause robustness issues (namely, failure to shut
17 : : * them down on exceptional conditions, and also, since the launcher is
18 : : * connected to shared memory and is thus subject to corruption there, it is
19 : : * not as robust as the postmaster). So it leaves that task to the postmaster.
20 : : *
21 : : * There is an autovacuum shared memory area, where the launcher stores
22 : : * information about the database it wants vacuumed. When it wants a new
23 : : * worker to start, it sets a flag in shared memory and sends a signal to the
24 : : * postmaster. Then postmaster knows nothing more than it must start a worker;
25 : : * so it forks a new child, which turns into a worker. This new process
26 : : * connects to shared memory, and there it can inspect the information that the
27 : : * launcher has set up.
28 : : *
29 : : * If the fork() call fails in the postmaster, it sets a flag in the shared
30 : : * memory area, and sends a signal to the launcher. The launcher, upon
31 : : * noticing the flag, can try starting the worker again by resending the
32 : : * signal. Note that the failure can only be transient (fork failure due to
33 : : * high load, memory pressure, too many processes, etc); more permanent
34 : : * problems, like failure to connect to a database, are detected later in the
35 : : * worker and dealt with just by having the worker exit normally. The launcher
36 : : * will launch a new worker again later, per schedule.
37 : : *
38 : : * When the worker is done vacuuming it sends SIGUSR2 to the launcher. The
39 : : * launcher then wakes up and is able to launch another worker, if the schedule
40 : : * is so tight that a new worker is needed immediately. At this time the
41 : : * launcher can also balance the settings for the various remaining workers'
42 : : * cost-based vacuum delay feature.
43 : : *
44 : : * Note that there can be more than one worker in a database concurrently.
45 : : * They will store the table they are currently vacuuming in shared memory, so
46 : : * that other workers avoid being blocked waiting for the vacuum lock for that
47 : : * table. They will also fetch the last time the table was vacuumed from
48 : : * pgstats just before vacuuming each table, to avoid vacuuming a table that
49 : : * was just finished being vacuumed by another worker and thus is no longer
50 : : * noted in shared memory. However, there is a small window (due to not yet
51 : : * holding the relation lock) during which a worker may choose a table that was
52 : : * already vacuumed; this is a bug in the current design.
53 : : *
54 : : * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
55 : : * Portions Copyright (c) 1994, Regents of the University of California
56 : : *
57 : : *
58 : : * IDENTIFICATION
59 : : * src/backend/postmaster/autovacuum.c
60 : : *
61 : : *-------------------------------------------------------------------------
62 : : */
63 : : #include "postgres.h"
64 : :
65 : : #include <signal.h>
66 : : #include <sys/time.h>
67 : : #include <unistd.h>
68 : :
69 : : #include "access/heapam.h"
70 : : #include "access/htup_details.h"
71 : : #include "access/multixact.h"
72 : : #include "access/reloptions.h"
73 : : #include "access/tableam.h"
74 : : #include "access/transam.h"
75 : : #include "access/xact.h"
76 : : #include "catalog/dependency.h"
77 : : #include "catalog/namespace.h"
78 : : #include "catalog/pg_database.h"
79 : : #include "catalog/pg_namespace.h"
80 : : #include "commands/vacuum.h"
81 : : #include "common/int.h"
82 : : #include "lib/ilist.h"
83 : : #include "libpq/pqsignal.h"
84 : : #include "miscadmin.h"
85 : : #include "nodes/makefuncs.h"
86 : : #include "pgstat.h"
87 : : #include "postmaster/autovacuum.h"
88 : : #include "postmaster/interrupt.h"
89 : : #include "postmaster/postmaster.h"
90 : : #include "storage/aio_subsys.h"
91 : : #include "storage/bufmgr.h"
92 : : #include "storage/ipc.h"
93 : : #include "storage/latch.h"
94 : : #include "storage/lmgr.h"
95 : : #include "storage/pmsignal.h"
96 : : #include "storage/proc.h"
97 : : #include "storage/procsignal.h"
98 : : #include "storage/smgr.h"
99 : : #include "tcop/tcopprot.h"
100 : : #include "utils/fmgroids.h"
101 : : #include "utils/fmgrprotos.h"
102 : : #include "utils/guc_hooks.h"
103 : : #include "utils/injection_point.h"
104 : : #include "utils/lsyscache.h"
105 : : #include "utils/memutils.h"
106 : : #include "utils/ps_status.h"
107 : : #include "utils/rel.h"
108 : : #include "utils/snapmgr.h"
109 : : #include "utils/syscache.h"
110 : : #include "utils/timeout.h"
111 : : #include "utils/timestamp.h"
112 : :
113 : :
114 : : /*
115 : : * GUC parameters
116 : : */
117 : : bool autovacuum_start_daemon = false;
118 : : int autovacuum_worker_slots;
119 : : int autovacuum_max_workers;
120 : : int autovacuum_work_mem = -1;
121 : : int autovacuum_naptime;
122 : : int autovacuum_vac_thresh;
123 : : int autovacuum_vac_max_thresh;
124 : : double autovacuum_vac_scale;
125 : : int autovacuum_vac_ins_thresh;
126 : : double autovacuum_vac_ins_scale;
127 : : int autovacuum_anl_thresh;
128 : : double autovacuum_anl_scale;
129 : : int autovacuum_freeze_max_age;
130 : : int autovacuum_multixact_freeze_max_age;
131 : :
132 : : double autovacuum_vac_cost_delay;
133 : : int autovacuum_vac_cost_limit;
134 : :
135 : : int Log_autovacuum_min_duration = 600000;
136 : : int Log_autoanalyze_min_duration = 600000;
137 : :
138 : : /* the minimum allowed time between two awakenings of the launcher */
139 : : #define MIN_AUTOVAC_SLEEPTIME 100.0 /* milliseconds */
140 : : #define MAX_AUTOVAC_SLEEPTIME 300 /* seconds */
141 : :
142 : : /*
143 : : * Variables to save the cost-related storage parameters for the current
144 : : * relation being vacuumed by this autovacuum worker. Using these, we can
145 : : * ensure we don't overwrite the values of vacuum_cost_delay and
146 : : * vacuum_cost_limit after reloading the configuration file. They are
147 : : * initialized to "invalid" values to indicate that no cost-related storage
148 : : * parameters were specified and will be set in do_autovacuum() after checking
149 : : * the storage parameters in table_recheck_autovac().
150 : : */
151 : : static double av_storage_param_cost_delay = -1;
152 : : static int av_storage_param_cost_limit = -1;
153 : :
154 : : /* Flags set by signal handlers */
155 : : static volatile sig_atomic_t got_SIGUSR2 = false;
156 : :
157 : : /* Comparison points for determining whether freeze_max_age is exceeded */
158 : : static TransactionId recentXid;
159 : : static MultiXactId recentMulti;
160 : :
161 : : /* Default freeze ages to use for autovacuum (varies by database) */
162 : : static int default_freeze_min_age;
163 : : static int default_freeze_table_age;
164 : : static int default_multixact_freeze_min_age;
165 : : static int default_multixact_freeze_table_age;
166 : :
167 : : /* Memory context for long-lived data */
168 : : static MemoryContext AutovacMemCxt;
169 : :
170 : : /* struct to keep track of databases in launcher */
171 : : typedef struct avl_dbase
172 : : {
173 : : Oid adl_datid; /* hash key -- must be first */
174 : : TimestampTz adl_next_worker;
175 : : int adl_score;
176 : : dlist_node adl_node;
177 : : } avl_dbase;
178 : :
179 : : /* struct to keep track of databases in worker */
180 : : typedef struct avw_dbase
181 : : {
182 : : Oid adw_datid;
183 : : char *adw_name;
184 : : TransactionId adw_frozenxid;
185 : : MultiXactId adw_minmulti;
186 : : PgStat_StatDBEntry *adw_entry;
187 : : } avw_dbase;
188 : :
189 : : /* struct to keep track of tables to vacuum and/or analyze, in 1st pass */
190 : : typedef struct av_relation
191 : : {
192 : : Oid ar_toastrelid; /* hash key - must be first */
193 : : Oid ar_relid;
194 : : bool ar_hasrelopts;
195 : : AutoVacOpts ar_reloptions; /* copy of AutoVacOpts from the main table's
196 : : * reloptions, or NULL if none */
197 : : } av_relation;
198 : :
199 : : /* struct to keep track of tables to vacuum and/or analyze, after rechecking */
200 : : typedef struct autovac_table
201 : : {
202 : : Oid at_relid;
203 : : VacuumParams at_params;
204 : : double at_storage_param_vac_cost_delay;
205 : : int at_storage_param_vac_cost_limit;
206 : : bool at_dobalance;
207 : : bool at_sharedrel;
208 : : char *at_relname;
209 : : char *at_nspname;
210 : : char *at_datname;
211 : : } autovac_table;
212 : :
213 : : /*-------------
214 : : * This struct holds information about a single worker's whereabouts. We keep
215 : : * an array of these in shared memory, sized according to
216 : : * autovacuum_worker_slots.
217 : : *
218 : : * wi_links entry into free list or running list
219 : : * wi_dboid OID of the database this worker is supposed to work on
220 : : * wi_tableoid OID of the table currently being vacuumed, if any
221 : : * wi_sharedrel flag indicating whether table is marked relisshared
222 : : * wi_proc pointer to PGPROC of the running worker, NULL if not started
223 : : * wi_launchtime Time at which this worker was launched
224 : : * wi_dobalance Whether this worker should be included in balance calculations
225 : : *
226 : : * All fields are protected by AutovacuumLock, except for wi_tableoid and
227 : : * wi_sharedrel which are protected by AutovacuumScheduleLock (note these
228 : : * two fields are read-only for everyone except that worker itself).
229 : : *-------------
230 : : */
231 : : typedef struct WorkerInfoData
232 : : {
233 : : dlist_node wi_links;
234 : : Oid wi_dboid;
235 : : Oid wi_tableoid;
236 : : PGPROC *wi_proc;
237 : : TimestampTz wi_launchtime;
238 : : pg_atomic_flag wi_dobalance;
239 : : bool wi_sharedrel;
240 : : } WorkerInfoData;
241 : :
242 : : typedef struct WorkerInfoData *WorkerInfo;
243 : :
244 : : /*
245 : : * Possible signals received by the launcher from remote processes. These are
246 : : * stored atomically in shared memory so that other processes can set them
247 : : * without locking.
248 : : */
249 : : typedef enum
250 : : {
251 : : AutoVacForkFailed, /* failed trying to start a worker */
252 : : AutoVacRebalance, /* rebalance the cost limits */
253 : : } AutoVacuumSignal;
254 : :
255 : : #define AutoVacNumSignals (AutoVacRebalance + 1)
256 : :
257 : : /*
258 : : * Autovacuum workitem array, stored in AutoVacuumShmem->av_workItems. This
259 : : * list is mostly protected by AutovacuumLock, except that if an item is
260 : : * marked 'active' other processes must not modify the work-identifying
261 : : * members.
262 : : */
263 : : typedef struct AutoVacuumWorkItem
264 : : {
265 : : AutoVacuumWorkItemType avw_type;
266 : : bool avw_used; /* below data is valid */
267 : : bool avw_active; /* being processed */
268 : : Oid avw_database;
269 : : Oid avw_relation;
270 : : BlockNumber avw_blockNumber;
271 : : } AutoVacuumWorkItem;
272 : :
273 : : #define NUM_WORKITEMS 256
274 : :
275 : : /*-------------
276 : : * The main autovacuum shmem struct. On shared memory we store this main
277 : : * struct and the array of WorkerInfo structs. This struct keeps:
278 : : *
279 : : * av_signal set by other processes to indicate various conditions
280 : : * av_launcherpid the PID of the autovacuum launcher
281 : : * av_freeWorkers the WorkerInfo freelist
282 : : * av_runningWorkers the WorkerInfo non-free queue
283 : : * av_startingWorker pointer to WorkerInfo currently being started (cleared by
284 : : * the worker itself as soon as it's up and running)
285 : : * av_workItems work item array
286 : : * av_nworkersForBalance the number of autovacuum workers to use when
287 : : * calculating the per worker cost limit
288 : : *
289 : : * This struct is protected by AutovacuumLock, except for av_signal and parts
290 : : * of the worker list (see above).
291 : : *-------------
292 : : */
293 : : typedef struct
294 : : {
295 : : sig_atomic_t av_signal[AutoVacNumSignals];
296 : : pid_t av_launcherpid;
297 : : dclist_head av_freeWorkers;
298 : : dlist_head av_runningWorkers;
299 : : WorkerInfo av_startingWorker;
300 : : AutoVacuumWorkItem av_workItems[NUM_WORKITEMS];
301 : : pg_atomic_uint32 av_nworkersForBalance;
302 : : } AutoVacuumShmemStruct;
303 : :
304 : : static AutoVacuumShmemStruct *AutoVacuumShmem;
305 : :
306 : : /*
307 : : * the database list (of avl_dbase elements) in the launcher, and the context
308 : : * that contains it
309 : : */
310 : : static dlist_head DatabaseList = DLIST_STATIC_INIT(DatabaseList);
311 : : static MemoryContext DatabaseListCxt = NULL;
312 : :
313 : : /*
314 : : * Dummy pointer to persuade Valgrind that we've not leaked the array of
315 : : * avl_dbase structs. Make it global to ensure the compiler doesn't
316 : : * optimize it away.
317 : : */
318 : : #ifdef USE_VALGRIND
319 : : extern avl_dbase *avl_dbase_array;
320 : : avl_dbase *avl_dbase_array;
321 : : #endif
322 : :
323 : : /* Pointer to my own WorkerInfo, valid on each worker */
324 : : static WorkerInfo MyWorkerInfo = NULL;
325 : :
326 : : /* PID of launcher, valid only in worker while shutting down */
327 : : int AutovacuumLauncherPid = 0;
328 : :
329 : : static Oid do_start_worker(void);
330 : : static void ProcessAutoVacLauncherInterrupts(void);
331 : : pg_noreturn static void AutoVacLauncherShutdown(void);
332 : : static void launcher_determine_sleep(bool canlaunch, bool recursing,
333 : : struct timeval *nap);
334 : : static void launch_worker(TimestampTz now);
335 : : static List *get_database_list(void);
336 : : static void rebuild_database_list(Oid newdb);
337 : : static int db_comparator(const void *a, const void *b);
338 : : static void autovac_recalculate_workers_for_balance(void);
339 : :
340 : : static void do_autovacuum(void);
341 : : static void FreeWorkerInfo(int code, Datum arg);
342 : :
343 : : static autovac_table *table_recheck_autovac(Oid relid, HTAB *table_toast_map,
344 : : TupleDesc pg_class_desc,
345 : : int effective_multixact_freeze_max_age);
346 : : static void recheck_relation_needs_vacanalyze(Oid relid, AutoVacOpts *avopts,
347 : : Form_pg_class classForm,
348 : : int effective_multixact_freeze_max_age,
349 : : bool *dovacuum, bool *doanalyze, bool *wraparound);
350 : : static void relation_needs_vacanalyze(Oid relid, AutoVacOpts *relopts,
351 : : Form_pg_class classForm,
352 : : PgStat_StatTabEntry *tabentry,
353 : : int effective_multixact_freeze_max_age,
354 : : bool *dovacuum, bool *doanalyze, bool *wraparound);
355 : :
356 : : static void autovacuum_do_vac_analyze(autovac_table *tab,
357 : : BufferAccessStrategy bstrategy);
358 : : static AutoVacOpts *extract_autovac_opts(HeapTuple tup,
359 : : TupleDesc pg_class_desc);
360 : : static void perform_work_item(AutoVacuumWorkItem *workitem);
361 : : static void autovac_report_activity(autovac_table *tab);
362 : : static void autovac_report_workitem(AutoVacuumWorkItem *workitem,
363 : : const char *nspname, const char *relname);
364 : : static void avl_sigusr2_handler(SIGNAL_ARGS);
365 : : static bool av_worker_available(void);
366 : : static void check_av_worker_gucs(void);
367 : :
368 : :
369 : :
370 : : /********************************************************************
371 : : * AUTOVACUUM LAUNCHER CODE
372 : : ********************************************************************/
373 : :
374 : : /*
375 : : * Main entry point for the autovacuum launcher process.
376 : : */
377 : : void
298 peter@eisentraut.org 378 :CBC 382 : AutoVacLauncherMain(const void *startup_data, size_t startup_data_len)
379 : : {
380 : : sigjmp_buf local_sigjmp_buf;
381 : :
638 heikki.linnakangas@i 382 [ - + ]: 382 : Assert(startup_data_len == 0);
383 : :
384 : : /* Release postmaster's working memory context */
385 [ + - ]: 382 : if (PostmasterContext)
386 : : {
387 : 382 : MemoryContextDelete(PostmasterContext);
388 : 382 : PostmasterContext = NULL;
389 : : }
390 : :
2106 peter@eisentraut.org 391 : 382 : MyBackendType = B_AUTOVAC_LAUNCHER;
392 : 382 : init_ps_display(NULL);
393 : :
3203 tgl@sss.pgh.pa.us 394 [ + + ]: 382 : ereport(DEBUG1,
395 : : (errmsg_internal("autovacuum launcher started")));
396 : :
6628 alvherre@alvh.no-ip. 397 [ - + ]: 382 : if (PostAuthDelay)
6628 alvherre@alvh.no-ip. 398 :UBC 0 : pg_usleep(PostAuthDelay * 1000000L);
399 : :
532 heikki.linnakangas@i 400 [ - + ]:CBC 382 : Assert(GetProcessingMode() == InitProcessing);
401 : :
402 : : /*
403 : : * Set up signal handlers. We operate on databases much like a regular
404 : : * backend, so we use the same signal handling. See equivalent code in
405 : : * tcop/postgres.c.
406 : : */
2191 rhaas@postgresql.org 407 : 382 : pqsignal(SIGHUP, SignalHandlerForConfigReload);
5951 tgl@sss.pgh.pa.us 408 : 382 : pqsignal(SIGINT, StatementCancelHandler);
2191 rhaas@postgresql.org 409 : 382 : pqsignal(SIGTERM, SignalHandlerForShutdownRequest);
410 : : /* SIGQUIT handler was already set up by InitPostmasterChild */
411 : :
4901 alvherre@alvh.no-ip. 412 : 382 : InitializeTimeouts(); /* establishes SIGALRM handler */
413 : :
6879 414 : 382 : pqsignal(SIGPIPE, SIG_IGN);
5951 tgl@sss.pgh.pa.us 415 : 382 : pqsignal(SIGUSR1, procsignal_sigusr1_handler);
416 : 382 : pqsignal(SIGUSR2, avl_sigusr2_handler);
6879 alvherre@alvh.no-ip. 417 : 382 : pqsignal(SIGFPE, FloatExceptionHandler);
418 : 382 : pqsignal(SIGCHLD, SIG_DFL);
419 : :
420 : : /*
421 : : * Create a per-backend PGPROC struct in shared memory. We must do this
422 : : * before we can use LWLocks or access any shared memory.
423 : : */
5951 tgl@sss.pgh.pa.us 424 : 382 : InitProcess();
425 : :
426 : : /* Early initialization */
1594 andres@anarazel.de 427 : 382 : BaseInit();
428 : :
797 michael@paquier.xyz 429 : 382 : InitPostgres(NULL, InvalidOid, NULL, InvalidOid, 0, NULL);
430 : :
5951 tgl@sss.pgh.pa.us 431 : 382 : SetProcessingMode(NormalProcessing);
432 : :
433 : : /*
434 : : * Create a memory context that we will do all our work in. We do this so
435 : : * that we can reset the context during error recovery and thereby avoid
436 : : * possible memory leaks.
437 : : */
6819 alvherre@alvh.no-ip. 438 : 382 : AutovacMemCxt = AllocSetContextCreate(TopMemoryContext,
439 : : "Autovacuum Launcher",
440 : : ALLOCSET_DEFAULT_SIZES);
441 : 382 : MemoryContextSwitchTo(AutovacMemCxt);
442 : :
443 : : /*
444 : : * If an exception is encountered, processing resumes here.
445 : : *
446 : : * This code is a stripped down version of PostgresMain error recovery.
447 : : *
448 : : * Note that we use sigsetjmp(..., 1), so that the prevailing signal mask
449 : : * (to wit, BlockSig) will be restored when longjmp'ing to here. Thus,
450 : : * signals other than SIGQUIT will be blocked until we complete error
451 : : * recovery. It might seem that this policy makes the HOLD_INTERRUPTS()
452 : : * call redundant, but it is not since InterruptPending might be set
453 : : * already.
454 : : */
6879 455 [ - + ]: 382 : if (sigsetjmp(local_sigjmp_buf, 1) != 0)
456 : : {
457 : : /* since not using PG_TRY, must reset error stack by hand */
6879 alvherre@alvh.no-ip. 458 :UBC 0 : error_context_stack = NULL;
459 : :
460 : : /* Prevents interrupts while cleaning up */
461 : 0 : HOLD_INTERRUPTS();
462 : :
463 : : /* Forget any pending QueryCancel or timeout request */
4901 464 : 0 : disable_all_timeouts(false);
3100 tgl@sss.pgh.pa.us 465 : 0 : QueryCancelPending = false; /* second to avoid race condition */
466 : :
467 : : /* Report the error to the server log */
6879 alvherre@alvh.no-ip. 468 : 0 : EmitErrorReport();
469 : :
470 : : /* Abort the current transaction in order to recover */
5951 tgl@sss.pgh.pa.us 471 : 0 : AbortCurrentTransaction();
472 : :
473 : : /*
474 : : * Release any other resources, for the case where we were not in a
475 : : * transaction.
476 : : */
3045 alvherre@alvh.no-ip. 477 : 0 : LWLockReleaseAll();
478 : 0 : pgstat_report_wait_end();
274 andres@anarazel.de 479 : 0 : pgaio_error_cleanup();
3045 alvherre@alvh.no-ip. 480 : 0 : UnlockBuffers();
481 : : /* this is probably dead code, but let's be safe: */
2708 tgl@sss.pgh.pa.us 482 [ # # ]: 0 : if (AuxProcessResourceOwner)
483 : 0 : ReleaseAuxProcessResources(false);
3045 alvherre@alvh.no-ip. 484 : 0 : AtEOXact_Buffers(false);
485 : 0 : AtEOXact_SMgr();
2789 tgl@sss.pgh.pa.us 486 : 0 : AtEOXact_Files(false);
3045 alvherre@alvh.no-ip. 487 : 0 : AtEOXact_HashTables(false);
488 : :
489 : : /*
490 : : * Now return to normal top-level context and clear ErrorContext for
491 : : * next time.
492 : : */
6819 493 : 0 : MemoryContextSwitchTo(AutovacMemCxt);
6879 494 : 0 : FlushErrorState();
495 : :
496 : : /* Flush any leaked data in the top-level context */
762 nathan@postgresql.or 497 : 0 : MemoryContextReset(AutovacMemCxt);
498 : :
499 : : /* don't leave dangling pointers to freed memory */
6819 alvherre@alvh.no-ip. 500 : 0 : DatabaseListCxt = NULL;
4809 501 : 0 : dlist_init(&DatabaseList);
502 : :
503 : : /* Now we can allow interrupts again */
6879 504 [ # # ]: 0 : RESUME_INTERRUPTS();
505 : :
506 : : /* if in shutdown mode, no need for anything further; just go away */
2191 rhaas@postgresql.org 507 [ # # ]: 0 : if (ShutdownRequestPending)
508 : 0 : AutoVacLauncherShutdown();
509 : :
510 : : /*
511 : : * Sleep at least 1 second after any error. We don't want to be
512 : : * filling the error logs as fast as we can.
513 : : */
6879 alvherre@alvh.no-ip. 514 : 0 : pg_usleep(1000000L);
515 : : }
516 : :
517 : : /* We can now handle ereport(ERROR) */
6879 alvherre@alvh.no-ip. 518 :CBC 382 : PG_exception_stack = &local_sigjmp_buf;
519 : :
520 : : /* must unblock signals before calling rebuild_database_list */
1047 tmunro@postgresql.or 521 : 382 : sigprocmask(SIG_SETMASK, &UnBlockSig, NULL);
522 : :
523 : : /*
524 : : * Set always-secure search path. Launcher doesn't connect to a database,
525 : : * so this has no effect.
526 : : */
2850 noah@leadboat.com 527 : 382 : SetConfigOption("search_path", "", PGC_SUSET, PGC_S_OVERRIDE);
528 : :
529 : : /*
530 : : * Force zero_damaged_pages OFF in the autovac process, even if it is set
531 : : * in postgresql.conf. We don't really want such a dangerous option being
532 : : * applied non-interactively.
533 : : */
5131 tgl@sss.pgh.pa.us 534 : 382 : SetConfigOption("zero_damaged_pages", "false", PGC_SUSET, PGC_S_OVERRIDE);
535 : :
536 : : /*
537 : : * Force settable timeouts off to avoid letting these settings prevent
538 : : * regular maintenance from being executed.
539 : : */
540 : 382 : SetConfigOption("statement_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
670 akorotkov@postgresql 541 : 382 : SetConfigOption("transaction_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
4658 tgl@sss.pgh.pa.us 542 : 382 : SetConfigOption("lock_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
3471 543 : 382 : SetConfigOption("idle_in_transaction_session_timeout", "0",
544 : : PGC_SUSET, PGC_S_OVERRIDE);
545 : :
546 : : /*
547 : : * Force default_transaction_isolation to READ COMMITTED. We don't want
548 : : * to pay the overhead of serializable mode, nor add any risk of causing
549 : : * deadlocks or delaying other transactions.
550 : : */
5131 551 : 382 : SetConfigOption("default_transaction_isolation", "read committed",
552 : : PGC_SUSET, PGC_S_OVERRIDE);
553 : :
554 : : /*
555 : : * Even when system is configured to use a different fetch consistency,
556 : : * for autovac we always want fresh stats.
557 : : */
1350 andres@anarazel.de 558 : 382 : SetConfigOption("stats_fetch_consistency", "none", PGC_SUSET, PGC_S_OVERRIDE);
559 : :
560 : : /*
561 : : * In emergency mode, just start a worker (unless shutdown was requested)
562 : : * and go away.
563 : : */
6658 tgl@sss.pgh.pa.us 564 [ - + ]: 382 : if (!AutoVacuumingActive())
565 : : {
2191 rhaas@postgresql.org 566 [ # # ]:UBC 0 : if (!ShutdownRequestPending)
3905 alvherre@alvh.no-ip. 567 : 0 : do_start_worker();
6606 bruce@momjian.us 568 : 0 : proc_exit(0); /* done */
569 : : }
570 : :
6819 alvherre@alvh.no-ip. 571 :CBC 382 : AutoVacuumShmem->av_launcherpid = MyProcPid;
572 : :
573 : : /*
574 : : * Create the initial database list. The invariant we want this list to
575 : : * keep is that it's ordered by decreasing next_worker. As soon as an
576 : : * entry is updated to a higher time, it will be moved to the front (which
577 : : * is correct because the only operation is to add autovacuum_naptime to
578 : : * the entry, and time always increases).
579 : : */
580 : 382 : rebuild_database_list(InvalidOid);
581 : :
582 : : /* loop until shutdown request */
2191 rhaas@postgresql.org 583 [ + + ]: 1708 : while (!ShutdownRequestPending)
584 : : {
585 : : struct timeval nap;
6819 alvherre@alvh.no-ip. 586 : 1706 : TimestampTz current_time = 0;
587 : : bool can_launch;
588 : :
589 : : /*
590 : : * This loop is a bit different from the normal use of WaitLatch,
591 : : * because we'd like to sleep before the first launch of a child
592 : : * process. So it's WaitLatch, then ResetLatch, then check for
593 : : * wakening conditions.
594 : : */
595 : :
344 nathan@postgresql.or 596 : 1706 : launcher_determine_sleep(av_worker_available(), false, &nap);
597 : :
598 : : /*
599 : : * Wait until naptime expires or we get some type of signal (all the
600 : : * signal handlers will wake us by calling SetLatch).
601 : : */
2580 tmunro@postgresql.or 602 : 1706 : (void) WaitLatch(MyLatch,
603 : : WL_LATCH_SET | WL_TIMEOUT | WL_EXIT_ON_PM_DEATH,
604 : 1706 : (nap.tv_sec * 1000L) + (nap.tv_usec / 1000L),
605 : : WAIT_EVENT_AUTOVACUUM_MAIN);
606 : :
3989 andres@anarazel.de 607 : 1703 : ResetLatch(MyLatch);
608 : :
286 heikki.linnakangas@i 609 : 1703 : ProcessAutoVacLauncherInterrupts();
610 : :
611 : : /*
612 : : * a worker finished, or postmaster signaled failure to start a worker
613 : : */
5951 tgl@sss.pgh.pa.us 614 [ + + ]: 1326 : if (got_SIGUSR2)
615 : : {
616 : 69 : got_SIGUSR2 = false;
617 : :
618 : : /* rebalance cost limits, if needed */
6749 alvherre@alvh.no-ip. 619 [ + + ]: 69 : if (AutoVacuumShmem->av_signal[AutoVacRebalance])
620 : : {
6819 621 : 34 : LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
6749 622 : 34 : AutoVacuumShmem->av_signal[AutoVacRebalance] = false;
984 dgustafsson@postgres 623 : 34 : autovac_recalculate_workers_for_balance();
6819 alvherre@alvh.no-ip. 624 : 34 : LWLockRelease(AutovacuumLock);
625 : : }
626 : :
6749 627 [ - + ]: 69 : if (AutoVacuumShmem->av_signal[AutoVacForkFailed])
628 : : {
629 : : /*
630 : : * If the postmaster failed to start a new worker, we sleep
631 : : * for a little while and resend the signal. The new worker's
632 : : * state is still in memory, so this is sufficient. After
633 : : * that, we restart the main loop.
634 : : *
635 : : * XXX should we put a limit to the number of times we retry?
636 : : * I don't think it makes much sense, because a future start
637 : : * of a worker will continue to fail in the same way.
638 : : */
6749 alvherre@alvh.no-ip. 639 :UBC 0 : AutoVacuumShmem->av_signal[AutoVacForkFailed] = false;
5772 bruce@momjian.us 640 : 0 : pg_usleep(1000000L); /* 1s */
6749 alvherre@alvh.no-ip. 641 : 0 : SendPostmasterSignal(PMSIGNAL_START_AUTOVAC_WORKER);
642 : 0 : continue;
643 : : }
644 : : }
645 : :
646 : : /*
647 : : * There are some conditions that we need to check before trying to
648 : : * start a worker. First, we need to make sure that there is a worker
649 : : * slot available. Second, we need to make sure that no other worker
650 : : * failed while starting up.
651 : : */
652 : :
6749 alvherre@alvh.no-ip. 653 :CBC 1326 : current_time = GetCurrentTimestamp();
6879 654 : 1326 : LWLockAcquire(AutovacuumLock, LW_SHARED);
655 : :
344 nathan@postgresql.or 656 : 1326 : can_launch = av_worker_available();
657 : :
6253 tgl@sss.pgh.pa.us 658 [ - + ]: 1326 : if (AutoVacuumShmem->av_startingWorker != NULL)
659 : : {
660 : : int waittime;
6253 tgl@sss.pgh.pa.us 661 :UBC 0 : WorkerInfo worker = AutoVacuumShmem->av_startingWorker;
662 : :
663 : : /*
664 : : * We can't launch another worker when another one is still
665 : : * starting up (or failed while doing so), so just sleep for a bit
666 : : * more; that worker will wake us up again as soon as it's ready.
667 : : * We will only wait autovacuum_naptime seconds (up to a maximum
668 : : * of 60 seconds) for this to happen however. Note that failure
669 : : * to connect to a particular database is not a problem here,
670 : : * because the worker removes itself from the startingWorker
671 : : * pointer before trying to connect. Problems detected by the
672 : : * postmaster (like fork() failure) are also reported and handled
673 : : * differently. The only problems that may cause this code to
674 : : * fire are errors in the earlier sections of AutoVacWorkerMain,
675 : : * before the worker removes the WorkerInfo from the
676 : : * startingWorker pointer.
677 : : */
6749 alvherre@alvh.no-ip. 678 : 0 : waittime = Min(autovacuum_naptime, 60) * 1000;
6803 679 [ # # ]: 0 : if (TimestampDifferenceExceeds(worker->wi_launchtime, current_time,
680 : : waittime))
681 : : {
6819 682 : 0 : LWLockRelease(AutovacuumLock);
683 : 0 : LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
684 : :
685 : : /*
686 : : * No other process can put a worker in starting mode, so if
687 : : * startingWorker is still INVALID after exchanging our lock,
688 : : * we assume it's the same one we saw above (so we don't
689 : : * recheck the launch time).
690 : : */
6253 tgl@sss.pgh.pa.us 691 [ # # ]: 0 : if (AutoVacuumShmem->av_startingWorker != NULL)
692 : : {
693 : 0 : worker = AutoVacuumShmem->av_startingWorker;
6819 alvherre@alvh.no-ip. 694 : 0 : worker->wi_dboid = InvalidOid;
695 : 0 : worker->wi_tableoid = InvalidOid;
3507 696 : 0 : worker->wi_sharedrel = false;
6628 697 : 0 : worker->wi_proc = NULL;
6819 698 : 0 : worker->wi_launchtime = 0;
344 nathan@postgresql.or 699 : 0 : dclist_push_head(&AutoVacuumShmem->av_freeWorkers,
700 : : &worker->wi_links);
6253 tgl@sss.pgh.pa.us 701 : 0 : AutoVacuumShmem->av_startingWorker = NULL;
1485 alvherre@alvh.no-ip. 702 [ # # ]: 0 : ereport(WARNING,
703 : : errmsg("autovacuum worker took too long to start; canceled"));
704 : : }
705 : : }
706 : : else
6819 707 : 0 : can_launch = false;
708 : : }
6606 bruce@momjian.us 709 :CBC 1326 : LWLockRelease(AutovacuumLock); /* either shared or exclusive */
710 : :
711 : : /* if we can't do anything, just go back to sleep */
6749 alvherre@alvh.no-ip. 712 [ - + ]: 1326 : if (!can_launch)
6749 alvherre@alvh.no-ip. 713 :UBC 0 : continue;
714 : :
715 : : /* We're OK to start a new worker */
716 : :
4809 alvherre@alvh.no-ip. 717 [ + + ]:CBC 1326 : if (dlist_is_empty(&DatabaseList))
718 : : {
719 : : /*
720 : : * Special case when the list is empty: start a worker right away.
721 : : * This covers the initial case, when no database is in pgstats
722 : : * (thus the list is empty). Note that the constraints in
723 : : * launcher_determine_sleep keep us from starting workers too
724 : : * quickly (at most once every autovacuum_naptime when the list is
725 : : * empty).
726 : : */
6749 727 : 3 : launch_worker(current_time);
728 : : }
729 : : else
730 : : {
731 : : /*
732 : : * because rebuild_database_list constructs a list with most
733 : : * distant adl_next_worker first, we obtain our database from the
734 : : * tail of the list.
735 : : */
736 : : avl_dbase *avdb;
737 : :
4809 738 : 1323 : avdb = dlist_tail_element(avl_dbase, adl_node, &DatabaseList);
739 : :
740 : : /*
741 : : * launch a worker if next_worker is right now or it is in the
742 : : * past
743 : : */
744 [ + + ]: 1323 : if (TimestampDifferenceExceeds(avdb->adl_next_worker,
745 : : current_time, 0))
746 : 35 : launch_worker(current_time);
747 : : }
748 : : }
749 : :
2191 rhaas@postgresql.org 750 :GBC 2 : AutoVacLauncherShutdown();
751 : : }
752 : :
753 : : /*
754 : : * Process any new interrupts.
755 : : */
756 : : static void
286 heikki.linnakangas@i 757 :CBC 1703 : ProcessAutoVacLauncherInterrupts(void)
758 : : {
759 : : /* the normal shutdown case */
2191 rhaas@postgresql.org 760 [ + + ]: 1703 : if (ShutdownRequestPending)
761 : 377 : AutoVacLauncherShutdown();
762 : :
763 [ + + ]: 1326 : if (ConfigReloadPending)
764 : : {
344 nathan@postgresql.or 765 : 42 : int autovacuum_max_workers_prev = autovacuum_max_workers;
766 : :
2191 rhaas@postgresql.org 767 : 42 : ConfigReloadPending = false;
768 : 42 : ProcessConfigFile(PGC_SIGHUP);
769 : :
770 : : /* shutdown requested in config file? */
771 [ - + ]: 42 : if (!AutoVacuumingActive())
2191 rhaas@postgresql.org 772 :UBC 0 : AutoVacLauncherShutdown();
773 : :
774 : : /*
775 : : * If autovacuum_max_workers changed, emit a WARNING if
776 : : * autovacuum_worker_slots < autovacuum_max_workers. If it didn't
777 : : * change, skip this to avoid too many repeated log messages.
778 : : */
344 nathan@postgresql.or 779 [ - + ]:CBC 42 : if (autovacuum_max_workers_prev != autovacuum_max_workers)
344 nathan@postgresql.or 780 :UBC 0 : check_av_worker_gucs();
781 : :
782 : : /* rebuild the list in case the naptime changed */
2191 rhaas@postgresql.org 783 :CBC 42 : rebuild_database_list(InvalidOid);
784 : : }
785 : :
786 : : /* Process barrier events */
2189 787 [ + + ]: 1326 : if (ProcSignalBarrierPending)
788 : 30 : ProcessProcSignalBarrier();
789 : :
790 : : /* Perform logging of memory contexts of this process */
1526 fujii@postgresql.org 791 [ - + ]: 1326 : if (LogMemoryContextPending)
1526 fujii@postgresql.org 792 :UBC 0 : ProcessLogMemoryContextInterrupt();
793 : :
794 : : /* Process sinval catchup interrupts that happened while sleeping */
2191 rhaas@postgresql.org 795 :CBC 1326 : ProcessCatchupInterrupt();
796 : 1326 : }
797 : :
798 : : /*
799 : : * Perform a normal exit from the autovac launcher.
800 : : */
801 : : static void
2035 noah@leadboat.com 802 : 379 : AutoVacLauncherShutdown(void)
803 : : {
3203 tgl@sss.pgh.pa.us 804 [ + + ]: 379 : ereport(DEBUG1,
805 : : (errmsg_internal("autovacuum launcher shutting down")));
6819 alvherre@alvh.no-ip. 806 : 379 : AutoVacuumShmem->av_launcherpid = 0;
807 : :
6606 bruce@momjian.us 808 : 379 : proc_exit(0); /* done */
809 : : }
810 : :
811 : : /*
812 : : * Determine the time to sleep, based on the database list.
813 : : *
814 : : * The "canlaunch" parameter indicates whether we can start a worker right now,
815 : : * for example due to the workers being all busy. If this is false, we will
816 : : * cause a long sleep, which will be interrupted when a worker exits.
817 : : */
818 : : static void
3100 tgl@sss.pgh.pa.us 819 : 1706 : launcher_determine_sleep(bool canlaunch, bool recursing, struct timeval *nap)
820 : : {
821 : : /*
822 : : * We sleep until the next scheduled vacuum. We trust that when the
823 : : * database list was built, care was taken so that no entries have times
824 : : * in the past; if the first entry has too close a next_worker value, or a
825 : : * time in the past, we will sleep a small nominal time.
826 : : */
6819 alvherre@alvh.no-ip. 827 [ - + ]: 1706 : if (!canlaunch)
828 : : {
6761 alvherre@alvh.no-ip. 829 :UBC 0 : nap->tv_sec = autovacuum_naptime;
830 : 0 : nap->tv_usec = 0;
831 : : }
4809 alvherre@alvh.no-ip. 832 [ + + ]:CBC 1706 : else if (!dlist_is_empty(&DatabaseList))
833 : : {
6606 bruce@momjian.us 834 : 1684 : TimestampTz current_time = GetCurrentTimestamp();
835 : : TimestampTz next_wakeup;
836 : : avl_dbase *avdb;
837 : : long secs;
838 : : int usecs;
839 : :
4809 alvherre@alvh.no-ip. 840 : 1684 : avdb = dlist_tail_element(avl_dbase, adl_node, &DatabaseList);
841 : :
6819 842 : 1684 : next_wakeup = avdb->adl_next_worker;
843 : 1684 : TimestampDifference(current_time, next_wakeup, &secs, &usecs);
844 : :
6761 845 : 1684 : nap->tv_sec = secs;
846 : 1684 : nap->tv_usec = usecs;
847 : : }
848 : : else
849 : : {
850 : : /* list is empty, sleep for whole autovacuum_naptime seconds */
851 : 22 : nap->tv_sec = autovacuum_naptime;
852 : 22 : nap->tv_usec = 0;
853 : : }
854 : :
855 : : /*
856 : : * If the result is exactly zero, it means a database had an entry with
857 : : * time in the past. Rebuild the list so that the databases are evenly
858 : : * distributed again, and recalculate the time to sleep. This can happen
859 : : * if there are more tables needing vacuum than workers, and they all take
860 : : * longer to vacuum than autovacuum_naptime.
861 : : *
862 : : * We only recurse once. rebuild_database_list should always return times
863 : : * in the future, but it seems best not to trust too much on that.
864 : : */
6743 tgl@sss.pgh.pa.us 865 [ + + - + : 1706 : if (nap->tv_sec == 0 && nap->tv_usec == 0 && !recursing)
- - ]
866 : : {
6819 alvherre@alvh.no-ip. 867 :UBC 0 : rebuild_database_list(InvalidOid);
6761 868 : 0 : launcher_determine_sleep(canlaunch, true, nap);
869 : 0 : return;
870 : : }
871 : :
872 : : /* The smallest time we'll allow the launcher to sleep. */
6034 alvherre@alvh.no-ip. 873 [ + + + + ]:CBC 1706 : if (nap->tv_sec <= 0 && nap->tv_usec <= MIN_AUTOVAC_SLEEPTIME * 1000)
874 : : {
6743 tgl@sss.pgh.pa.us 875 : 13 : nap->tv_sec = 0;
6034 alvherre@alvh.no-ip. 876 : 13 : nap->tv_usec = MIN_AUTOVAC_SLEEPTIME * 1000;
877 : : }
878 : :
879 : : /*
880 : : * If the sleep time is too large, clamp it to an arbitrary maximum (plus
881 : : * any fractional seconds, for simplicity). This avoids an essentially
882 : : * infinite sleep in strange cases like the system clock going backwards a
883 : : * few years.
884 : : */
3833 885 [ + + ]: 1706 : if (nap->tv_sec > MAX_AUTOVAC_SLEEPTIME)
886 : 9 : nap->tv_sec = MAX_AUTOVAC_SLEEPTIME;
887 : : }
888 : :
889 : : /*
890 : : * Build an updated DatabaseList. It must only contain databases that appear
891 : : * in pgstats, and must be sorted by next_worker from highest to lowest,
892 : : * distributed regularly across the next autovacuum_naptime interval.
893 : : *
894 : : * Receives the Oid of the database that made this list be generated (we call
895 : : * this the "new" database, because when the database was already present on
896 : : * the list, we expect that this function is not called at all). The
897 : : * preexisting list, if any, will be used to preserve the order of the
898 : : * databases in the autovacuum_naptime period. The new database is put at the
899 : : * end of the interval. The actual values are not saved, which should not be
900 : : * much of a problem.
901 : : */
902 : : static void
6819 903 : 429 : rebuild_database_list(Oid newdb)
904 : : {
905 : : List *dblist;
906 : : ListCell *cell;
907 : : MemoryContext newcxt;
908 : : MemoryContext oldcxt;
909 : : MemoryContext tmpcxt;
910 : : HASHCTL hctl;
911 : : int score;
912 : : int nelems;
913 : : HTAB *dbhash;
914 : : dlist_iter iter;
915 : :
916 : 429 : newcxt = AllocSetContextCreate(AutovacMemCxt,
917 : : "Autovacuum database list",
918 : : ALLOCSET_DEFAULT_SIZES);
919 : 429 : tmpcxt = AllocSetContextCreate(newcxt,
920 : : "Autovacuum database list (tmp)",
921 : : ALLOCSET_DEFAULT_SIZES);
922 : 429 : oldcxt = MemoryContextSwitchTo(tmpcxt);
923 : :
924 : : /*
925 : : * Implementing this is not as simple as it sounds, because we need to put
926 : : * the new database at the end of the list; next the databases that were
927 : : * already on the list, and finally (at the tail of the list) all the
928 : : * other databases that are not on the existing list.
929 : : *
930 : : * To do this, we build an empty hash table of scored databases. We will
931 : : * start with the lowest score (zero) for the new database, then
932 : : * increasing scores for the databases in the existing list, in order, and
933 : : * lastly increasing scores for all databases gotten via
934 : : * get_database_list() that are not already on the hash.
935 : : *
936 : : * Then we will put all the hash elements into an array, sort the array by
937 : : * score, and finally put the array elements into the new doubly linked
938 : : * list.
939 : : */
940 : 429 : hctl.keysize = sizeof(Oid);
941 : 429 : hctl.entrysize = sizeof(avl_dbase);
942 : 429 : hctl.hcxt = tmpcxt;
1314 tgl@sss.pgh.pa.us 943 : 429 : dbhash = hash_create("autovacuum db hash", 20, &hctl, /* magic number here
944 : : * FIXME */
945 : : HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
946 : :
947 : : /* start by inserting the new database */
6819 alvherre@alvh.no-ip. 948 : 429 : score = 0;
949 [ + + ]: 429 : if (OidIsValid(newdb))
950 : : {
951 : : avl_dbase *db;
952 : : PgStat_StatDBEntry *entry;
953 : :
954 : : /* only consider this database if it has a pgstat entry */
955 : 5 : entry = pgstat_fetch_stat_dbentry(newdb);
956 [ + - ]: 5 : if (entry != NULL)
957 : : {
958 : : /* we assume it isn't found because the hash was just created */
959 : 5 : db = hash_search(dbhash, &newdb, HASH_ENTER, NULL);
960 : :
961 : : /* hash_search already filled in the key */
962 : 5 : db->adl_score = score++;
963 : : /* next_worker is filled in later */
964 : : }
965 : : }
966 : :
967 : : /* Now insert the databases from the existing list */
4809 968 [ + - + + ]: 502 : dlist_foreach(iter, &DatabaseList)
969 : : {
970 : 73 : avl_dbase *avdb = dlist_container(avl_dbase, adl_node, iter.cur);
971 : : avl_dbase *db;
972 : : bool found;
973 : : PgStat_StatDBEntry *entry;
974 : :
975 : : /*
976 : : * skip databases with no stat entries -- in particular, this gets rid
977 : : * of dropped databases
978 : : */
979 : 73 : entry = pgstat_fetch_stat_dbentry(avdb->adl_datid);
980 [ - + ]: 73 : if (entry == NULL)
4809 alvherre@alvh.no-ip. 981 :UBC 0 : continue;
982 : :
4809 alvherre@alvh.no-ip. 983 :CBC 73 : db = hash_search(dbhash, &(avdb->adl_datid), HASH_ENTER, &found);
984 : :
985 [ + - ]: 73 : if (!found)
986 : : {
987 : : /* hash_search already filled in the key */
988 : 73 : db->adl_score = score++;
989 : : /* next_worker is filled in later */
990 : : }
991 : : }
992 : :
993 : : /* finally, insert all qualifying databases not previously inserted */
6819 994 : 429 : dblist = get_database_list();
995 [ + - + + : 1890 : foreach(cell, dblist)
+ + ]
996 : : {
997 : 1461 : avw_dbase *avdb = lfirst(cell);
998 : : avl_dbase *db;
999 : : bool found;
1000 : : PgStat_StatDBEntry *entry;
1001 : :
1002 : : /* only consider databases with a pgstat entry */
1003 : 1461 : entry = pgstat_fetch_stat_dbentry(avdb->adw_datid);
1004 [ + + ]: 1461 : if (entry == NULL)
1005 : 846 : continue;
1006 : :
1007 : 615 : db = hash_search(dbhash, &(avdb->adw_datid), HASH_ENTER, &found);
1008 : : /* only update the score if the database was not already on the hash */
1009 [ + + ]: 615 : if (!found)
1010 : : {
1011 : : /* hash_search already filled in the key */
1012 : 537 : db->adl_score = score++;
1013 : : /* next_worker is filled in later */
1014 : : }
1015 : : }
1016 : 429 : nelems = score;
1017 : :
1018 : : /* from here on, the allocated memory belongs to the new list */
1019 : 429 : MemoryContextSwitchTo(newcxt);
4809 1020 : 429 : dlist_init(&DatabaseList);
1021 : :
6819 1022 [ + + ]: 429 : if (nelems > 0)
1023 : : {
1024 : : TimestampTz current_time;
1025 : : int millis_increment;
1026 : : avl_dbase *dbary;
1027 : : avl_dbase *db;
1028 : : HASH_SEQ_STATUS seq;
1029 : : int i;
1030 : :
1031 : : /* put all the hash elements into an array */
1032 : 409 : dbary = palloc(nelems * sizeof(avl_dbase));
1033 : : /* keep Valgrind quiet */
1034 : : #ifdef USE_VALGRIND
1035 : : avl_dbase_array = dbary;
1036 : : #endif
1037 : :
1038 : 409 : i = 0;
1039 : 409 : hash_seq_init(&seq, dbhash);
1040 [ + + ]: 1024 : while ((db = hash_seq_search(&seq)) != NULL)
1041 : 615 : memcpy(&(dbary[i++]), db, sizeof(avl_dbase));
1042 : :
1043 : : /* sort the array */
1044 : 409 : qsort(dbary, nelems, sizeof(avl_dbase), db_comparator);
1045 : :
1046 : : /*
1047 : : * Determine the time interval between databases in the schedule. If
1048 : : * we see that the configured naptime would take us to sleep times
1049 : : * lower than our min sleep time (which launcher_determine_sleep is
1050 : : * coded not to allow), silently use a larger naptime (but don't touch
1051 : : * the GUC variable).
1052 : : */
1053 : 409 : millis_increment = 1000.0 * autovacuum_naptime / nelems;
6034 1054 [ - + ]: 409 : if (millis_increment <= MIN_AUTOVAC_SLEEPTIME)
6034 alvherre@alvh.no-ip. 1055 :UBC 0 : millis_increment = MIN_AUTOVAC_SLEEPTIME * 1.1;
1056 : :
6819 alvherre@alvh.no-ip. 1057 :CBC 409 : current_time = GetCurrentTimestamp();
1058 : :
1059 : : /*
1060 : : * move the elements from the array into the dlist, setting the
1061 : : * next_worker while walking the array
1062 : : */
1063 [ + + ]: 1024 : for (i = 0; i < nelems; i++)
1064 : : {
1208 drowley@postgresql.o 1065 : 615 : db = &(dbary[i]);
1066 : :
6819 alvherre@alvh.no-ip. 1067 : 615 : current_time = TimestampTzPlusMilliseconds(current_time,
1068 : : millis_increment);
1069 : 615 : db->adl_next_worker = current_time;
1070 : :
1071 : : /* later elements should go closer to the head of the list */
4809 1072 : 615 : dlist_push_head(&DatabaseList, &db->adl_node);
1073 : : }
1074 : : }
1075 : :
1076 : : /* all done, clean up memory */
6819 1077 [ + + ]: 429 : if (DatabaseListCxt != NULL)
1078 : 47 : MemoryContextDelete(DatabaseListCxt);
1079 : 429 : MemoryContextDelete(tmpcxt);
1080 : 429 : DatabaseListCxt = newcxt;
1081 : 429 : MemoryContextSwitchTo(oldcxt);
1082 : 429 : }
1083 : :
1084 : : /* qsort comparator for avl_dbase, using adl_score */
1085 : : static int
1086 : 288 : db_comparator(const void *a, const void *b)
1087 : : {
669 nathan@postgresql.or 1088 : 576 : return pg_cmp_s32(((const avl_dbase *) a)->adl_score,
1089 : 288 : ((const avl_dbase *) b)->adl_score);
1090 : : }
1091 : :
1092 : : /*
1093 : : * do_start_worker
1094 : : *
1095 : : * Bare-bones procedure for starting an autovacuum worker from the launcher.
1096 : : * It determines what database to work on, sets up shared memory stuff and
1097 : : * signals postmaster to start the worker. It fails gracefully if invoked when
1098 : : * autovacuum_workers are already active.
1099 : : *
1100 : : * Return value is the OID of the database that the worker is going to process,
1101 : : * or InvalidOid if no worker was actually started.
1102 : : */
1103 : : static Oid
6843 alvherre@alvh.no-ip. 1104 : 38 : do_start_worker(void)
1105 : : {
1106 : : List *dblist;
1107 : : ListCell *cell;
1108 : : TransactionId xidForceLimit;
1109 : : MultiXactId multiForceLimit;
1110 : : bool for_xid_wrap;
1111 : : bool for_multi_wrap;
1112 : : avw_dbase *avdb;
1113 : : TimestampTz current_time;
6819 1114 : 38 : bool skipit = false;
6670 1115 : 38 : Oid retval = InvalidOid;
1116 : : MemoryContext tmpcxt,
1117 : : oldcxt;
1118 : :
1119 : : /* return quickly when there are no free workers */
6819 1120 : 38 : LWLockAcquire(AutovacuumLock, LW_SHARED);
344 nathan@postgresql.or 1121 [ - + ]: 38 : if (!av_worker_available())
1122 : : {
6819 alvherre@alvh.no-ip. 1123 :UBC 0 : LWLockRelease(AutovacuumLock);
1124 : 0 : return InvalidOid;
1125 : : }
6819 alvherre@alvh.no-ip. 1126 :CBC 38 : LWLockRelease(AutovacuumLock);
1127 : :
1128 : : /*
1129 : : * Create and switch to a temporary context to avoid leaking the memory
1130 : : * allocated for the database list.
1131 : : */
6670 1132 : 38 : tmpcxt = AllocSetContextCreate(CurrentMemoryContext,
1133 : : "Autovacuum start worker (tmp)",
1134 : : ALLOCSET_DEFAULT_SIZES);
1135 : 38 : oldcxt = MemoryContextSwitchTo(tmpcxt);
1136 : :
1137 : : /* Get a list of databases */
6819 1138 : 38 : dblist = get_database_list();
1139 : :
1140 : : /*
1141 : : * Determine the oldest datfrozenxid/relfrozenxid that we will allow to
1142 : : * pass without forcing a vacuum. (This limit can be tightened for
1143 : : * particular tables, but not loosened.)
1144 : : */
1765 tmunro@postgresql.or 1145 : 38 : recentXid = ReadNextTransactionId();
6843 alvherre@alvh.no-ip. 1146 : 38 : xidForceLimit = recentXid - autovacuum_freeze_max_age;
1147 : : /* ensure it's a "normal" XID, else TransactionIdPrecedes misbehaves */
1148 : : /* this can cause the limit to go backwards by 3, but that's OK */
1149 [ - + ]: 38 : if (xidForceLimit < FirstNormalTransactionId)
6843 alvherre@alvh.no-ip. 1150 :UBC 0 : xidForceLimit -= FirstNormalTransactionId;
1151 : :
1152 : : /* Also determine the oldest datminmxid we will consider. */
4710 alvherre@alvh.no-ip. 1153 :CBC 38 : recentMulti = ReadNextMultiXactId();
3875 rhaas@postgresql.org 1154 : 38 : multiForceLimit = recentMulti - MultiXactMemberFreezeThreshold();
4710 alvherre@alvh.no-ip. 1155 [ - + ]: 38 : if (multiForceLimit < FirstMultiXactId)
4710 alvherre@alvh.no-ip. 1156 :UBC 0 : multiForceLimit -= FirstMultiXactId;
1157 : :
1158 : : /*
1159 : : * Choose a database to connect to. We pick the database that was least
1160 : : * recently auto-vacuumed, or one that needs vacuuming to prevent Xid
1161 : : * wraparound-related data loss. If any db at risk of Xid wraparound is
1162 : : * found, we pick the one with oldest datfrozenxid, independently of
1163 : : * autovacuum times; similarly we pick the one with the oldest datminmxid
1164 : : * if any is in MultiXactId wraparound. Note that those in Xid wraparound
1165 : : * danger are given more priority than those in multi wraparound danger.
1166 : : *
1167 : : * Note that a database with no stats entry is not considered, except for
1168 : : * Xid wraparound purposes. The theory is that if no one has ever
1169 : : * connected to it since the stats were last initialized, it doesn't need
1170 : : * vacuuming.
1171 : : *
1172 : : * XXX This could be improved if we had more info about whether it needs
1173 : : * vacuuming before connecting to it. Perhaps look through the pgstats
1174 : : * data for the database's tables? One idea is to keep track of the
1175 : : * number of new and dead tuples per database in pgstats. However it
1176 : : * isn't clear how to construct a metric that measures that and not cause
1177 : : * starvation for less busy databases.
1178 : : */
6819 alvherre@alvh.no-ip. 1179 :CBC 38 : avdb = NULL;
6843 1180 : 38 : for_xid_wrap = false;
4710 1181 : 38 : for_multi_wrap = false;
6819 1182 : 38 : current_time = GetCurrentTimestamp();
6843 1183 [ + - + + : 208 : foreach(cell, dblist)
+ + ]
1184 : : {
6819 1185 : 170 : avw_dbase *tmp = lfirst(cell);
1186 : : dlist_iter iter;
1187 : :
1188 : : /* Check to see if this one is at risk of wraparound */
1189 [ - + ]: 170 : if (TransactionIdPrecedes(tmp->adw_frozenxid, xidForceLimit))
1190 : : {
6819 alvherre@alvh.no-ip. 1191 [ # # # # ]:UBC 0 : if (avdb == NULL ||
4710 1192 : 0 : TransactionIdPrecedes(tmp->adw_frozenxid,
1193 : : avdb->adw_frozenxid))
6819 1194 : 0 : avdb = tmp;
6843 1195 : 0 : for_xid_wrap = true;
6843 alvherre@alvh.no-ip. 1196 :CBC 122 : continue;
1197 : : }
1198 [ - + ]: 170 : else if (for_xid_wrap)
6843 alvherre@alvh.no-ip. 1199 :UBC 0 : continue; /* ignore not-at-risk DBs */
4474 alvherre@alvh.no-ip. 1200 [ - + ]:CBC 170 : else if (MultiXactIdPrecedes(tmp->adw_minmulti, multiForceLimit))
1201 : : {
4710 alvherre@alvh.no-ip. 1202 [ # # # # ]:UBC 0 : if (avdb == NULL ||
4474 1203 : 0 : MultiXactIdPrecedes(tmp->adw_minmulti, avdb->adw_minmulti))
4710 1204 : 0 : avdb = tmp;
1205 : 0 : for_multi_wrap = true;
1206 : 0 : continue;
1207 : : }
4710 alvherre@alvh.no-ip. 1208 [ - + ]:CBC 170 : else if (for_multi_wrap)
4710 alvherre@alvh.no-ip. 1209 :UBC 0 : continue; /* ignore not-at-risk DBs */
1210 : :
1211 : : /* Find pgstat entry if any */
6658 alvherre@alvh.no-ip. 1212 :CBC 170 : tmp->adw_entry = pgstat_fetch_stat_dbentry(tmp->adw_datid);
1213 : :
1214 : : /*
1215 : : * Skip a database with no pgstat entry; it means it hasn't seen any
1216 : : * activity.
1217 : : */
6819 1218 [ + + ]: 170 : if (!tmp->adw_entry)
1219 : 36 : continue;
1220 : :
1221 : : /*
1222 : : * Also, skip a database that appears on the database list as having
1223 : : * been processed recently (less than autovacuum_naptime seconds ago).
1224 : : * We do this so that we don't select a database which we just
1225 : : * selected, but that pgstat hasn't gotten around to updating the last
1226 : : * autovacuum time yet.
1227 : : */
1228 : 134 : skipit = false;
1229 : :
4809 1230 [ + - + + ]: 317 : dlist_reverse_foreach(iter, &DatabaseList)
1231 : : {
1232 : 304 : avl_dbase *dbp = dlist_container(avl_dbase, adl_node, iter.cur);
1233 : :
6819 1234 [ + + ]: 304 : if (dbp->adl_datid == tmp->adw_datid)
1235 : : {
1236 : : /*
1237 : : * Skip this database if its next_worker value falls between
1238 : : * the current time and the current time plus naptime.
1239 : : */
6798 1240 [ + + ]: 121 : if (!TimestampDifferenceExceeds(dbp->adl_next_worker,
6606 bruce@momjian.us 1241 : 86 : current_time, 0) &&
6803 alvherre@alvh.no-ip. 1242 [ + - ]: 86 : !TimestampDifferenceExceeds(current_time,
1243 : : dbp->adl_next_worker,
1244 : : autovacuum_naptime * 1000))
6819 1245 : 86 : skipit = true;
1246 : :
1247 : 121 : break;
1248 : : }
1249 : : }
1250 [ + + ]: 134 : if (skipit)
6843 1251 : 86 : continue;
1252 : :
1253 : : /*
1254 : : * Remember the db with oldest autovac time. (If we are here, both
1255 : : * tmp->entry and db->entry must be non-null.)
1256 : : */
6819 1257 [ + + ]: 48 : if (avdb == NULL ||
1258 [ - + ]: 13 : tmp->adw_entry->last_autovac_time < avdb->adw_entry->last_autovac_time)
1259 : 35 : avdb = tmp;
1260 : : }
1261 : :
1262 : : /* Found a database -- process it */
1263 [ + + ]: 38 : if (avdb != NULL)
1264 : : {
1265 : : WorkerInfo worker;
1266 : : dlist_node *wptr;
1267 : :
6843 1268 : 35 : LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
1269 : :
1270 : : /*
1271 : : * Get a worker entry from the freelist. We checked above, so there
1272 : : * really should be a free slot.
1273 : : */
344 nathan@postgresql.or 1274 : 35 : wptr = dclist_pop_head_node(&AutoVacuumShmem->av_freeWorkers);
1275 : :
4809 alvherre@alvh.no-ip. 1276 : 35 : worker = dlist_container(WorkerInfoData, wi_links, wptr);
6819 1277 : 35 : worker->wi_dboid = avdb->adw_datid;
6628 1278 : 35 : worker->wi_proc = NULL;
6819 1279 : 35 : worker->wi_launchtime = GetCurrentTimestamp();
1280 : :
6253 tgl@sss.pgh.pa.us 1281 : 35 : AutoVacuumShmem->av_startingWorker = worker;
1282 : :
6843 alvherre@alvh.no-ip. 1283 : 35 : LWLockRelease(AutovacuumLock);
1284 : :
1285 : 35 : SendPostmasterSignal(PMSIGNAL_START_AUTOVAC_WORKER);
1286 : :
6670 1287 : 35 : retval = avdb->adw_datid;
1288 : : }
6819 1289 [ - + ]: 3 : else if (skipit)
1290 : : {
1291 : : /*
1292 : : * If we skipped all databases on the list, rebuild it, because it
1293 : : * probably contains a dropped database.
1294 : : */
6819 alvherre@alvh.no-ip. 1295 :UBC 0 : rebuild_database_list(InvalidOid);
1296 : : }
1297 : :
6670 alvherre@alvh.no-ip. 1298 :CBC 38 : MemoryContextSwitchTo(oldcxt);
1299 : 38 : MemoryContextDelete(tmpcxt);
1300 : :
1301 : 38 : return retval;
1302 : : }
1303 : :
1304 : : /*
1305 : : * launch_worker
1306 : : *
1307 : : * Wrapper for starting a worker from the launcher. Besides actually starting
1308 : : * it, update the database list to reflect the next time that another one will
1309 : : * need to be started on the selected database. The actual database choice is
1310 : : * left to do_start_worker.
1311 : : *
1312 : : * This routine is also expected to insert an entry into the database list if
1313 : : * the selected database was previously absent from the list.
1314 : : */
1315 : : static void
6819 1316 : 38 : launch_worker(TimestampTz now)
1317 : : {
1318 : : Oid dbid;
1319 : : dlist_iter iter;
1320 : :
1321 : 38 : dbid = do_start_worker();
1322 [ + + ]: 38 : if (OidIsValid(dbid))
1323 : : {
4584 bruce@momjian.us 1324 : 35 : bool found = false;
1325 : :
1326 : : /*
1327 : : * Walk the database list and update the corresponding entry. If the
1328 : : * database is not on the list, we'll recreate the list.
1329 : : */
4809 alvherre@alvh.no-ip. 1330 [ + - + + ]: 126 : dlist_foreach(iter, &DatabaseList)
1331 : : {
1332 : 121 : avl_dbase *avdb = dlist_container(avl_dbase, adl_node, iter.cur);
1333 : :
6819 1334 [ + + ]: 121 : if (avdb->adl_datid == dbid)
1335 : : {
4809 1336 : 30 : found = true;
1337 : :
1338 : : /*
1339 : : * add autovacuum_naptime seconds to the current time, and use
1340 : : * that as the new "next_worker" field for this database.
1341 : : */
6819 1342 : 30 : avdb->adl_next_worker =
1343 : 30 : TimestampTzPlusMilliseconds(now, autovacuum_naptime * 1000);
1344 : :
4809 1345 : 30 : dlist_move_head(&DatabaseList, iter.cur);
6819 1346 : 30 : break;
1347 : : }
1348 : : }
1349 : :
1350 : : /*
1351 : : * If the database was not present in the database list, we rebuild
1352 : : * the list. It's possible that the database does not get into the
1353 : : * list anyway, for example if it's a database that doesn't have a
1354 : : * pgstat entry, but this is not a problem because we don't want to
1355 : : * schedule workers regularly into those in any case.
1356 : : */
4809 1357 [ + + ]: 35 : if (!found)
6819 1358 : 5 : rebuild_database_list(dbid);
1359 : : }
6843 1360 : 38 : }
1361 : :
1362 : : /*
1363 : : * Called from postmaster to signal a failure to fork a process to become
1364 : : * worker. The postmaster should kill(SIGUSR2) the launcher shortly
1365 : : * after calling this function.
1366 : : */
1367 : : void
6749 alvherre@alvh.no-ip. 1368 :UBC 0 : AutoVacWorkerFailed(void)
1369 : : {
1370 : 0 : AutoVacuumShmem->av_signal[AutoVacForkFailed] = true;
1371 : 0 : }
1372 : :
1373 : : /* SIGUSR2: a worker is up and running, or just finished, or failed to fork */
1374 : : static void
5951 tgl@sss.pgh.pa.us 1375 :CBC 69 : avl_sigusr2_handler(SIGNAL_ARGS)
1376 : : {
1377 : 69 : got_SIGUSR2 = true;
3989 andres@anarazel.de 1378 : 69 : SetLatch(MyLatch);
6819 alvherre@alvh.no-ip. 1379 : 69 : }
1380 : :
1381 : :
1382 : : /********************************************************************
1383 : : * AUTOVACUUM WORKER CODE
1384 : : ********************************************************************/
1385 : :
1386 : : /*
1387 : : * Main entry point for autovacuum worker processes.
1388 : : */
1389 : : void
298 peter@eisentraut.org 1390 : 35 : AutoVacWorkerMain(const void *startup_data, size_t startup_data_len)
1391 : : {
1392 : : sigjmp_buf local_sigjmp_buf;
1393 : : Oid dbid;
1394 : :
638 heikki.linnakangas@i 1395 [ - + ]: 35 : Assert(startup_data_len == 0);
1396 : :
1397 : : /* Release postmaster's working memory context */
1398 [ + - ]: 35 : if (PostmasterContext)
1399 : : {
1400 : 35 : MemoryContextDelete(PostmasterContext);
1401 : 35 : PostmasterContext = NULL;
1402 : : }
1403 : :
2106 peter@eisentraut.org 1404 : 35 : MyBackendType = B_AUTOVAC_WORKER;
1405 : 35 : init_ps_display(NULL);
1406 : :
532 heikki.linnakangas@i 1407 [ - + ]: 35 : Assert(GetProcessingMode() == InitProcessing);
1408 : :
1409 : : /*
1410 : : * Set up signal handlers. We operate on databases much like a regular
1411 : : * backend, so we use the same signal handling. See equivalent code in
1412 : : * tcop/postgres.c.
1413 : : */
2191 rhaas@postgresql.org 1414 : 35 : pqsignal(SIGHUP, SignalHandlerForConfigReload);
1415 : :
1416 : : /*
1417 : : * SIGINT is used to signal canceling the current table's vacuum; SIGTERM
1418 : : * means abort and exit cleanly, and SIGQUIT means abandon ship.
1419 : : */
7460 tgl@sss.pgh.pa.us 1420 : 35 : pqsignal(SIGINT, StatementCancelHandler);
1421 : 35 : pqsignal(SIGTERM, die);
1422 : : /* SIGQUIT handler was already set up by InitPostmasterChild */
1423 : :
4901 alvherre@alvh.no-ip. 1424 : 35 : InitializeTimeouts(); /* establishes SIGALRM handler */
1425 : :
7460 tgl@sss.pgh.pa.us 1426 : 35 : pqsignal(SIGPIPE, SIG_IGN);
5982 1427 : 35 : pqsignal(SIGUSR1, procsignal_sigusr1_handler);
7460 1428 : 35 : pqsignal(SIGUSR2, SIG_IGN);
7432 1429 : 35 : pqsignal(SIGFPE, FloatExceptionHandler);
7460 1430 : 35 : pqsignal(SIGCHLD, SIG_DFL);
1431 : :
1432 : : /*
1433 : : * Create a per-backend PGPROC struct in shared memory. We must do this
1434 : : * before we can use LWLocks or access any shared memory.
1435 : : */
7286 1436 : 35 : InitProcess();
1437 : :
1438 : : /* Early initialization */
1594 andres@anarazel.de 1439 : 35 : BaseInit();
1440 : :
1441 : : /*
1442 : : * If an exception is encountered, processing resumes here.
1443 : : *
1444 : : * Unlike most auxiliary processes, we don't attempt to continue
1445 : : * processing after an error; we just clean up and exit. The autovac
1446 : : * launcher is responsible for spawning another worker later.
1447 : : *
1448 : : * Note that we use sigsetjmp(..., 1), so that the prevailing signal mask
1449 : : * (to wit, BlockSig) will be restored when longjmp'ing to here. Thus,
1450 : : * signals other than SIGQUIT will be blocked until we exit. It might
1451 : : * seem that this policy makes the HOLD_INTERRUPTS() call redundant, but
1452 : : * it is not since InterruptPending might be set already.
1453 : : */
7460 tgl@sss.pgh.pa.us 1454 [ - + ]: 35 : if (sigsetjmp(local_sigjmp_buf, 1) != 0)
1455 : : {
1456 : : /* since not using PG_TRY, must reset error stack by hand */
2246 michael@paquier.xyz 1457 :UBC 0 : error_context_stack = NULL;
1458 : :
1459 : : /* Prevents interrupts while cleaning up */
7460 tgl@sss.pgh.pa.us 1460 : 0 : HOLD_INTERRUPTS();
1461 : :
1462 : : /* Report the error to the server log */
1463 : 0 : EmitErrorReport();
1464 : :
1465 : : /*
1466 : : * We can now go away. Note that because we called InitProcess, a
1467 : : * callback was registered to do ProcKill, which will clean up
1468 : : * necessary state.
1469 : : */
1470 : 0 : proc_exit(0);
1471 : : }
1472 : :
1473 : : /* We can now handle ereport(ERROR) */
7460 tgl@sss.pgh.pa.us 1474 :CBC 35 : PG_exception_stack = &local_sigjmp_buf;
1475 : :
1047 tmunro@postgresql.or 1476 : 35 : sigprocmask(SIG_SETMASK, &UnBlockSig, NULL);
1477 : :
1478 : : /*
1479 : : * Set always-secure search path, so malicious users can't redirect user
1480 : : * code (e.g. pg_index.indexprs). (That code runs in a
1481 : : * SECURITY_RESTRICTED_OPERATION sandbox, so malicious users could not
1482 : : * take control of the entire autovacuum worker in any case.)
1483 : : */
2850 noah@leadboat.com 1484 : 35 : SetConfigOption("search_path", "", PGC_SUSET, PGC_S_OVERRIDE);
1485 : :
1486 : : /*
1487 : : * Force zero_damaged_pages OFF in the autovac process, even if it is set
1488 : : * in postgresql.conf. We don't really want such a dangerous option being
1489 : : * applied non-interactively.
1490 : : */
7224 tgl@sss.pgh.pa.us 1491 : 35 : SetConfigOption("zero_damaged_pages", "false", PGC_SUSET, PGC_S_OVERRIDE);
1492 : :
1493 : : /*
1494 : : * Force settable timeouts off to avoid letting these settings prevent
1495 : : * regular maintenance from being executed.
1496 : : */
6819 alvherre@alvh.no-ip. 1497 : 35 : SetConfigOption("statement_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
670 akorotkov@postgresql 1498 : 35 : SetConfigOption("transaction_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
4658 tgl@sss.pgh.pa.us 1499 : 35 : SetConfigOption("lock_timeout", "0", PGC_SUSET, PGC_S_OVERRIDE);
3471 1500 : 35 : SetConfigOption("idle_in_transaction_session_timeout", "0",
1501 : : PGC_SUSET, PGC_S_OVERRIDE);
1502 : :
1503 : : /*
1504 : : * Force default_transaction_isolation to READ COMMITTED. We don't want
1505 : : * to pay the overhead of serializable mode, nor add any risk of causing
1506 : : * deadlocks or delaying other transactions.
1507 : : */
5131 1508 : 35 : SetConfigOption("default_transaction_isolation", "read committed",
1509 : : PGC_SUSET, PGC_S_OVERRIDE);
1510 : :
1511 : : /*
1512 : : * Force synchronous replication off to allow regular maintenance even if
1513 : : * we are waiting for standbys to connect. This is important to ensure we
1514 : : * aren't blocked from performing anti-wraparound tasks.
1515 : : */
5370 simon@2ndQuadrant.co 1516 [ + - ]: 35 : if (synchronous_commit > SYNCHRONOUS_COMMIT_LOCAL_FLUSH)
5131 tgl@sss.pgh.pa.us 1517 : 35 : SetConfigOption("synchronous_commit", "local",
1518 : : PGC_SUSET, PGC_S_OVERRIDE);
1519 : :
1520 : : /*
1521 : : * Even when system is configured to use a different fetch consistency,
1522 : : * for autovac we always want fresh stats.
1523 : : */
1350 andres@anarazel.de 1524 : 35 : SetConfigOption("stats_fetch_consistency", "none", PGC_SUSET, PGC_S_OVERRIDE);
1525 : :
1526 : : /*
1527 : : * Get the info about the database we're going to work on.
1528 : : */
6819 alvherre@alvh.no-ip. 1529 : 35 : LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
1530 : :
1531 : : /*
1532 : : * beware of startingWorker being INVALID; this should normally not
1533 : : * happen, but if a worker fails after forking and before this, the
1534 : : * launcher might have decided to remove it from the queue and start
1535 : : * again.
1536 : : */
6253 tgl@sss.pgh.pa.us 1537 [ + - ]: 35 : if (AutoVacuumShmem->av_startingWorker != NULL)
1538 : : {
1539 : 35 : MyWorkerInfo = AutoVacuumShmem->av_startingWorker;
6803 alvherre@alvh.no-ip. 1540 : 35 : dbid = MyWorkerInfo->wi_dboid;
6628 1541 : 35 : MyWorkerInfo->wi_proc = MyProc;
1542 : :
1543 : : /* insert into the running list */
4809 1544 : 35 : dlist_push_head(&AutoVacuumShmem->av_runningWorkers,
1545 : 35 : &MyWorkerInfo->wi_links);
1546 : :
1547 : : /*
1548 : : * remove from the "starting" pointer, so that the launcher can start
1549 : : * a new worker if required
1550 : : */
6253 tgl@sss.pgh.pa.us 1551 : 35 : AutoVacuumShmem->av_startingWorker = NULL;
6803 alvherre@alvh.no-ip. 1552 : 35 : LWLockRelease(AutovacuumLock);
1553 : :
1554 : 35 : on_shmem_exit(FreeWorkerInfo, 0);
1555 : :
1556 : : /* wake up the launcher */
1557 [ + - ]: 35 : if (AutoVacuumShmem->av_launcherpid != 0)
5951 tgl@sss.pgh.pa.us 1558 : 35 : kill(AutoVacuumShmem->av_launcherpid, SIGUSR2);
1559 : : }
1560 : : else
1561 : : {
1562 : : /* no worker entry for me, go away */
6749 alvherre@alvh.no-ip. 1563 [ # # ]:UBC 0 : elog(WARNING, "autovacuum worker started without a worker entry");
6801 tgl@sss.pgh.pa.us 1564 : 0 : dbid = InvalidOid;
6803 alvherre@alvh.no-ip. 1565 : 0 : LWLockRelease(AutovacuumLock);
1566 : : }
1567 : :
6879 alvherre@alvh.no-ip. 1568 [ + - ]:CBC 35 : if (OidIsValid(dbid))
1569 : : {
1570 : : char dbname[NAMEDATALEN];
1571 : :
1572 : : /*
1573 : : * Report autovac startup to the cumulative stats system. We
1574 : : * deliberately do this before InitPostgres, so that the
1575 : : * last_autovac_time will get updated even if the connection attempt
1576 : : * fails. This is to prevent autovac from getting "stuck" repeatedly
1577 : : * selecting an unopenable database, rather than making any progress
1578 : : * on stuff it can connect to.
1579 : : */
1580 : 35 : pgstat_report_autovac(dbid);
1581 : :
1582 : : /*
1583 : : * Connect to the selected database, specifying no particular user,
1584 : : * and ignoring datallowconn. Collect the database's name for
1585 : : * display.
1586 : : *
1587 : : * Note: if we have selected a just-deleted database (due to using
1588 : : * stale stats info), we'll fail and exit here.
1589 : : */
353 tgl@sss.pgh.pa.us 1590 : 35 : InitPostgres(NULL, dbid, NULL, InvalidOid,
1591 : : INIT_PG_OVERRIDE_ALLOW_CONNS,
1592 : : dbname);
7460 1593 : 35 : SetProcessingMode(NormalProcessing);
2106 peter@eisentraut.org 1594 : 35 : set_ps_display(dbname);
7173 bruce@momjian.us 1595 [ - + ]: 35 : ereport(DEBUG1,
1596 : : (errmsg_internal("autovacuum: processing database \"%s\"", dbname)));
1597 : :
6628 alvherre@alvh.no-ip. 1598 [ - + ]: 35 : if (PostAuthDelay)
6628 alvherre@alvh.no-ip. 1599 :UBC 0 : pg_usleep(PostAuthDelay * 1000000L);
1600 : :
1601 : : /* And do an appropriate amount of work */
1765 tmunro@postgresql.or 1602 :CBC 35 : recentXid = ReadNextTransactionId();
4710 alvherre@alvh.no-ip. 1603 : 35 : recentMulti = ReadNextMultiXactId();
6838 1604 : 35 : do_autovacuum();
1605 : : }
1606 : :
1607 : : /*
1608 : : * The launcher will be notified of my death in ProcKill, *if* we managed
1609 : : * to get a worker slot at all
1610 : : */
1611 : :
1612 : : /* All done, go away */
7460 tgl@sss.pgh.pa.us 1613 : 34 : proc_exit(0);
1614 : : }
1615 : :
1616 : : /*
1617 : : * Return a WorkerInfo to the free list
1618 : : */
1619 : : static void
6819 alvherre@alvh.no-ip. 1620 : 35 : FreeWorkerInfo(int code, Datum arg)
1621 : : {
1622 [ + - ]: 35 : if (MyWorkerInfo != NULL)
1623 : : {
1624 : 35 : LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
1625 : :
1626 : : /*
1627 : : * Wake the launcher up so that he can launch a new worker immediately
1628 : : * if required. We only save the launcher's PID in local memory here;
1629 : : * the actual signal will be sent when the PGPROC is recycled. Note
1630 : : * that we always do this, so that the launcher can rebalance the cost
1631 : : * limit setting of the remaining workers.
1632 : : *
1633 : : * We somewhat ignore the risk that the launcher changes its PID
1634 : : * between us reading it and the actual kill; we expect ProcKill to be
1635 : : * called shortly after us, and we assume that PIDs are not reused too
1636 : : * quickly after a process exits.
1637 : : */
6749 1638 : 35 : AutovacuumLauncherPid = AutoVacuumShmem->av_launcherpid;
1639 : :
4807 tgl@sss.pgh.pa.us 1640 : 35 : dlist_delete(&MyWorkerInfo->wi_links);
6819 alvherre@alvh.no-ip. 1641 : 35 : MyWorkerInfo->wi_dboid = InvalidOid;
1642 : 35 : MyWorkerInfo->wi_tableoid = InvalidOid;
3507 1643 : 35 : MyWorkerInfo->wi_sharedrel = false;
6628 1644 : 35 : MyWorkerInfo->wi_proc = NULL;
6819 1645 : 35 : MyWorkerInfo->wi_launchtime = 0;
984 dgustafsson@postgres 1646 : 35 : pg_atomic_clear_flag(&MyWorkerInfo->wi_dobalance);
344 nathan@postgresql.or 1647 : 35 : dclist_push_head(&AutoVacuumShmem->av_freeWorkers,
1648 : 35 : &MyWorkerInfo->wi_links);
1649 : : /* not mine anymore */
6819 alvherre@alvh.no-ip. 1650 : 35 : MyWorkerInfo = NULL;
1651 : :
1652 : : /*
1653 : : * now that we're inactive, cause a rebalancing of the surviving
1654 : : * workers
1655 : : */
6749 1656 : 35 : AutoVacuumShmem->av_signal[AutoVacRebalance] = true;
6819 1657 : 35 : LWLockRelease(AutovacuumLock);
1658 : : }
1659 : 35 : }
1660 : :
1661 : : /*
1662 : : * Update vacuum cost-based delay-related parameters for autovacuum workers and
1663 : : * backends executing VACUUM or ANALYZE using the value of relevant GUCs and
1664 : : * global state. This must be called during setup for vacuum and after every
1665 : : * config reload to ensure up-to-date values.
1666 : : */
1667 : : void
984 dgustafsson@postgres 1668 : 7879 : VacuumUpdateCosts(void)
1669 : : {
6819 alvherre@alvh.no-ip. 1670 [ + + ]: 7879 : if (MyWorkerInfo)
1671 : : {
984 dgustafsson@postgres 1672 [ - + ]: 688 : if (av_storage_param_cost_delay >= 0)
984 dgustafsson@postgres 1673 :UBC 0 : vacuum_cost_delay = av_storage_param_cost_delay;
984 dgustafsson@postgres 1674 [ + - ]:CBC 688 : else if (autovacuum_vac_cost_delay >= 0)
1675 : 688 : vacuum_cost_delay = autovacuum_vac_cost_delay;
1676 : : else
1677 : : /* fall back to VacuumCostDelay */
984 dgustafsson@postgres 1678 :UBC 0 : vacuum_cost_delay = VacuumCostDelay;
1679 : :
984 dgustafsson@postgres 1680 :CBC 688 : AutoVacuumUpdateCostLimit();
1681 : : }
1682 : : else
1683 : : {
1684 : : /* Must be explicit VACUUM or ANALYZE */
1685 : 7191 : vacuum_cost_delay = VacuumCostDelay;
1686 : 7191 : vacuum_cost_limit = VacuumCostLimit;
1687 : : }
1688 : :
1689 : : /*
1690 : : * If configuration changes are allowed to impact VacuumCostActive, make
1691 : : * sure it is updated.
1692 : : */
1693 [ - + ]: 7879 : if (VacuumFailsafeActive)
984 dgustafsson@postgres 1694 [ # # ]:UBC 0 : Assert(!VacuumCostActive);
984 dgustafsson@postgres 1695 [ + + ]:CBC 7879 : else if (vacuum_cost_delay > 0)
1696 : 688 : VacuumCostActive = true;
1697 : : else
1698 : : {
1699 : 7191 : VacuumCostActive = false;
1700 : 7191 : VacuumCostBalance = 0;
1701 : : }
1702 : :
1703 : : /*
1704 : : * Since the cost logging requires a lock, avoid rendering the log message
1705 : : * in case we are using a message level where the log wouldn't be emitted.
1706 : : */
971 1707 [ + + - + ]: 7879 : if (MyWorkerInfo && message_level_is_interesting(DEBUG2))
1708 : : {
1709 : : Oid dboid,
1710 : : tableoid;
1711 : :
984 dgustafsson@postgres 1712 [ # # ]:UBC 0 : Assert(!LWLockHeldByMe(AutovacuumLock));
1713 : :
1714 : 0 : LWLockAcquire(AutovacuumLock, LW_SHARED);
1715 : 0 : dboid = MyWorkerInfo->wi_dboid;
1716 : 0 : tableoid = MyWorkerInfo->wi_tableoid;
1717 : 0 : LWLockRelease(AutovacuumLock);
1718 : :
1719 [ # # # # : 0 : elog(DEBUG2,
# # # # ]
1720 : : "Autovacuum VacuumUpdateCosts(db=%u, rel=%u, dobalance=%s, cost_limit=%d, cost_delay=%g active=%s failsafe=%s)",
1721 : : dboid, tableoid, pg_atomic_unlocked_test_flag(&MyWorkerInfo->wi_dobalance) ? "no" : "yes",
1722 : : vacuum_cost_limit, vacuum_cost_delay,
1723 : : vacuum_cost_delay > 0 ? "yes" : "no",
1724 : : VacuumFailsafeActive ? "yes" : "no");
1725 : : }
6819 alvherre@alvh.no-ip. 1726 :CBC 7879 : }
1727 : :
1728 : : /*
1729 : : * Update vacuum_cost_limit with the correct value for an autovacuum worker,
1730 : : * given the value of other relevant cost limit parameters and the number of
1731 : : * workers across which the limit must be balanced. Autovacuum workers must
1732 : : * call this regularly in case av_nworkersForBalance has been updated by
1733 : : * another worker or by the autovacuum launcher. They must also call it after a
1734 : : * config reload.
1735 : : */
1736 : : void
984 dgustafsson@postgres 1737 : 2030 : AutoVacuumUpdateCostLimit(void)
1738 : : {
1739 [ - + ]: 2030 : if (!MyWorkerInfo)
984 dgustafsson@postgres 1740 :UBC 0 : return;
1741 : :
1742 : : /*
1743 : : * note: in cost_limit, zero also means use value from elsewhere, because
1744 : : * zero is not a valid value.
1745 : : */
1746 : :
984 dgustafsson@postgres 1747 [ - + ]:CBC 2030 : if (av_storage_param_cost_limit > 0)
984 dgustafsson@postgres 1748 :UBC 0 : vacuum_cost_limit = av_storage_param_cost_limit;
1749 : : else
1750 : : {
1751 : : int nworkers_for_balance;
1752 : :
984 dgustafsson@postgres 1753 [ - + ]:CBC 2030 : if (autovacuum_vac_cost_limit > 0)
984 dgustafsson@postgres 1754 :UBC 0 : vacuum_cost_limit = autovacuum_vac_cost_limit;
1755 : : else
984 dgustafsson@postgres 1756 :CBC 2030 : vacuum_cost_limit = VacuumCostLimit;
1757 : :
1758 : : /* Only balance limit if no cost-related storage parameters specified */
1759 [ - + ]: 2030 : if (pg_atomic_unlocked_test_flag(&MyWorkerInfo->wi_dobalance))
984 dgustafsson@postgres 1760 :UBC 0 : return;
1761 : :
984 dgustafsson@postgres 1762 [ - + ]:CBC 2030 : Assert(vacuum_cost_limit > 0);
1763 : :
1764 : 2030 : nworkers_for_balance = pg_atomic_read_u32(&AutoVacuumShmem->av_nworkersForBalance);
1765 : :
1766 : : /* There is at least 1 autovac worker (this worker) */
1767 [ - + ]: 2030 : if (nworkers_for_balance <= 0)
984 dgustafsson@postgres 1768 [ # # ]:UBC 0 : elog(ERROR, "nworkers_for_balance must be > 0");
1769 : :
984 dgustafsson@postgres 1770 :CBC 2030 : vacuum_cost_limit = Max(vacuum_cost_limit / nworkers_for_balance, 1);
1771 : : }
1772 : : }
1773 : :
1774 : : /*
1775 : : * autovac_recalculate_workers_for_balance
1776 : : * Recalculate the number of workers to consider, given cost-related
1777 : : * storage parameters and the current number of active workers.
1778 : : *
1779 : : * Caller must hold the AutovacuumLock in at least shared mode to access
1780 : : * worker->wi_proc.
1781 : : */
1782 : : static void
1783 : 378 : autovac_recalculate_workers_for_balance(void)
1784 : : {
1785 : : dlist_iter iter;
1786 : : int orig_nworkers_for_balance;
1787 : 378 : int nworkers_for_balance = 0;
1788 : :
1789 [ - + ]: 378 : Assert(LWLockHeldByMe(AutovacuumLock));
1790 : :
1791 : 378 : orig_nworkers_for_balance =
1792 : 378 : pg_atomic_read_u32(&AutoVacuumShmem->av_nworkersForBalance);
1793 : :
4809 alvherre@alvh.no-ip. 1794 [ + - + + ]: 722 : dlist_foreach(iter, &AutoVacuumShmem->av_runningWorkers)
1795 : : {
4584 bruce@momjian.us 1796 : 344 : WorkerInfo worker = dlist_container(WorkerInfoData, wi_links, iter.cur);
1797 : :
984 dgustafsson@postgres 1798 [ + - - + ]: 688 : if (worker->wi_proc == NULL ||
1799 : 344 : pg_atomic_unlocked_test_flag(&worker->wi_dobalance))
984 dgustafsson@postgres 1800 :UBC 0 : continue;
1801 : :
984 dgustafsson@postgres 1802 :CBC 344 : nworkers_for_balance++;
1803 : : }
1804 : :
1805 [ + + ]: 378 : if (nworkers_for_balance != orig_nworkers_for_balance)
1806 : 57 : pg_atomic_write_u32(&AutoVacuumShmem->av_nworkersForBalance,
1807 : : nworkers_for_balance);
6819 alvherre@alvh.no-ip. 1808 : 378 : }
1809 : :
1810 : : /*
1811 : : * get_database_list
1812 : : * Return a list of all databases found in pg_database.
1813 : : *
1814 : : * The list and associated data is allocated in the caller's memory context,
1815 : : * which is in charge of ensuring that it's properly cleaned up afterwards.
1816 : : *
1817 : : * Note: this is the only function in which the autovacuum launcher uses a
1818 : : * transaction. Although we aren't attached to any particular database and
1819 : : * therefore can't access most catalogs, we do have enough infrastructure
1820 : : * to do a seqscan on pg_database.
1821 : : */
1822 : : static List *
1823 : 467 : get_database_list(void)
1824 : : {
7367 bruce@momjian.us 1825 : 467 : List *dblist = NIL;
1826 : : Relation rel;
1827 : : TableScanDesc scan;
1828 : : HeapTuple tup;
1829 : : MemoryContext resultcxt;
1830 : :
1831 : : /* This is the context that we will allocate our output data in */
5517 alvherre@alvh.no-ip. 1832 : 467 : resultcxt = CurrentMemoryContext;
1833 : :
1834 : : /*
1835 : : * Start a transaction so we can access pg_database.
1836 : : */
5951 tgl@sss.pgh.pa.us 1837 : 467 : StartTransactionCommand();
1838 : :
2521 andres@anarazel.de 1839 : 467 : rel = table_open(DatabaseRelationId, AccessShareLock);
2472 1840 : 467 : scan = table_beginscan_catalog(rel, 0, NULL);
1841 : :
5951 tgl@sss.pgh.pa.us 1842 [ + + ]: 2098 : while (HeapTupleIsValid(tup = heap_getnext(scan, ForwardScanDirection)))
1843 : : {
1844 : 1631 : Form_pg_database pgdatabase = (Form_pg_database) GETSTRUCT(tup);
1845 : : avw_dbase *avdb;
1846 : : MemoryContext oldcxt;
1847 : :
1848 : : /*
1849 : : * If database has partially been dropped, we can't, nor need to,
1850 : : * vacuum it.
1851 : : */
887 andres@anarazel.de 1852 [ - + ]: 1631 : if (database_is_invalid_form(pgdatabase))
1853 : : {
887 andres@anarazel.de 1854 [ # # ]:LBC (2) : elog(DEBUG2,
1855 : : "autovacuum: skipping invalid database \"%s\"",
1856 : : NameStr(pgdatabase->datname));
1857 : (2) : continue;
1858 : : }
1859 : :
1860 : : /*
1861 : : * Allocate our results in the caller's context, not the
1862 : : * transaction's. We do this inside the loop, and restore the original
1863 : : * context at the end, so that leaky things like heap_getnext() are
1864 : : * not called in a potentially long-lived context.
1865 : : */
5517 alvherre@alvh.no-ip. 1866 :CBC 1631 : oldcxt = MemoryContextSwitchTo(resultcxt);
1867 : :
6 michael@paquier.xyz 1868 :GNC 1631 : avdb = palloc_object(avw_dbase);
1869 : :
2583 andres@anarazel.de 1870 :CBC 1631 : avdb->adw_datid = pgdatabase->oid;
5951 tgl@sss.pgh.pa.us 1871 : 1631 : avdb->adw_name = pstrdup(NameStr(pgdatabase->datname));
1872 : 1631 : avdb->adw_frozenxid = pgdatabase->datfrozenxid;
4474 alvherre@alvh.no-ip. 1873 : 1631 : avdb->adw_minmulti = pgdatabase->datminmxid;
1874 : : /* this gets set later: */
6819 1875 : 1631 : avdb->adw_entry = NULL;
1876 : :
6839 1877 : 1631 : dblist = lappend(dblist, avdb);
5517 1878 : 1631 : MemoryContextSwitchTo(oldcxt);
1879 : : }
1880 : :
2472 andres@anarazel.de 1881 : 467 : table_endscan(scan);
2521 1882 : 467 : table_close(rel, AccessShareLock);
1883 : :
5951 tgl@sss.pgh.pa.us 1884 : 467 : CommitTransactionCommand();
1885 : :
1886 : : /* Be sure to restore caller's memory context */
1203 1887 : 467 : MemoryContextSwitchTo(resultcxt);
1888 : :
7460 1889 : 467 : return dblist;
1890 : : }
1891 : :
1892 : : /*
1893 : : * Process a database table-by-table
1894 : : *
1895 : : * Note that CHECK_FOR_INTERRUPTS is supposed to be used in certain spots in
1896 : : * order not to ignore shutdown commands for too long.
1897 : : */
1898 : : static void
6838 alvherre@alvh.no-ip. 1899 : 35 : do_autovacuum(void)
1900 : : {
1901 : : Relation classRel;
1902 : : HeapTuple tuple;
1903 : : TableScanDesc relScan;
1904 : : Form_pg_database dbForm;
1905 : 35 : List *table_oids = NIL;
3312 rhaas@postgresql.org 1906 : 35 : List *orphan_oids = NIL;
1907 : : HASHCTL ctl;
1908 : : HTAB *table_toast_map;
1909 : : ListCell *volatile cell;
1910 : : BufferAccessStrategy bstrategy;
1911 : : ScanKeyData key;
1912 : : TupleDesc pg_class_desc;
1913 : : int effective_multixact_freeze_max_age;
3252 1914 : 35 : bool did_vacuum = false;
1915 : 35 : bool found_concurrent_worker = false;
1916 : : int i;
1917 : :
1918 : : /*
1919 : : * StartTransactionCommand and CommitTransactionCommand will automatically
1920 : : * switch to other contexts. We need this one to keep the list of
1921 : : * relations to vacuum/analyze across transactions.
1922 : : */
6744 alvherre@alvh.no-ip. 1923 : 35 : AutovacMemCxt = AllocSetContextCreate(TopMemoryContext,
1924 : : "Autovacuum worker",
1925 : : ALLOCSET_DEFAULT_SIZES);
1926 : 35 : MemoryContextSwitchTo(AutovacMemCxt);
1927 : :
1928 : : /* Start a transaction so our commands have one to play into. */
7460 tgl@sss.pgh.pa.us 1929 : 35 : StartTransactionCommand();
1930 : :
1931 : : /*
1932 : : * This injection point is put in a transaction block to work with a wait
1933 : : * that uses a condition variable.
1934 : : */
1935 : : INJECTION_POINT("autovacuum-worker-start", NULL);
1936 : :
1937 : : /*
1938 : : * Compute the multixact age for which freezing is urgent. This is
1939 : : * normally autovacuum_multixact_freeze_max_age, but may be less if
1940 : : * multixact members are bloated.
1941 : : */
3875 rhaas@postgresql.org 1942 : 35 : effective_multixact_freeze_max_age = MultiXactMemberFreezeThreshold();
1943 : :
1944 : : /*
1945 : : * Find the pg_database entry and select the default freeze ages. We use
1946 : : * zero in template and nonconnectable databases, else the system-wide
1947 : : * default.
1948 : : */
5784 1949 : 35 : tuple = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
6981 tgl@sss.pgh.pa.us 1950 [ - + ]: 35 : if (!HeapTupleIsValid(tuple))
6981 tgl@sss.pgh.pa.us 1951 [ # # ]:UBC 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
6981 tgl@sss.pgh.pa.us 1952 :CBC 35 : dbForm = (Form_pg_database) GETSTRUCT(tuple);
1953 : :
1954 [ + + - + ]: 35 : if (dbForm->datistemplate || !dbForm->datallowconn)
1955 : : {
1956 : 15 : default_freeze_min_age = 0;
6178 heikki.linnakangas@i 1957 : 15 : default_freeze_table_age = 0;
4324 alvherre@alvh.no-ip. 1958 : 15 : default_multixact_freeze_min_age = 0;
1959 : 15 : default_multixact_freeze_table_age = 0;
1960 : : }
1961 : : else
1962 : : {
6981 tgl@sss.pgh.pa.us 1963 : 20 : default_freeze_min_age = vacuum_freeze_min_age;
6178 heikki.linnakangas@i 1964 : 20 : default_freeze_table_age = vacuum_freeze_table_age;
4324 alvherre@alvh.no-ip. 1965 : 20 : default_multixact_freeze_min_age = vacuum_multixact_freeze_min_age;
1966 : 20 : default_multixact_freeze_table_age = vacuum_multixact_freeze_table_age;
1967 : : }
1968 : :
6981 tgl@sss.pgh.pa.us 1969 : 35 : ReleaseSysCache(tuple);
1970 : :
1971 : : /* StartTransactionCommand changed elsewhere */
7460 1972 : 35 : MemoryContextSwitchTo(AutovacMemCxt);
1973 : :
2521 andres@anarazel.de 1974 : 35 : classRel = table_open(RelationRelationId, AccessShareLock);
1975 : :
1976 : : /* create a copy so we can use it after closing pg_class */
6154 alvherre@alvh.no-ip. 1977 : 35 : pg_class_desc = CreateTupleDescCopy(RelationGetDescr(classRel));
1978 : :
1979 : : /* create hash table for toast <-> main relid mapping */
6334 1980 : 35 : ctl.keysize = sizeof(Oid);
6154 1981 : 35 : ctl.entrysize = sizeof(av_relation);
1982 : :
6334 1983 : 35 : table_toast_map = hash_create("TOAST to main relid map",
1984 : : 100,
1985 : : &ctl,
1986 : : HASH_ELEM | HASH_BLOBS);
1987 : :
1988 : : /*
1989 : : * Scan pg_class to determine which tables to vacuum.
1990 : : *
1991 : : * We do this in two passes: on the first one we collect the list of plain
1992 : : * relations and materialized views, and on the second one we collect
1993 : : * TOAST tables. The reason for doing the second pass is that during it we
1994 : : * want to use the main relation's pg_class.reloptions entry if the TOAST
1995 : : * table does not have any, and we cannot obtain it unless we know
1996 : : * beforehand what's the main table OID.
1997 : : *
1998 : : * We need to check TOAST tables separately because in cases with short,
1999 : : * wide tables there might be proportionally much more activity in the
2000 : : * TOAST table than in its parent.
2001 : : */
2472 andres@anarazel.de 2002 : 35 : relScan = table_beginscan_catalog(classRel, 0, NULL);
2003 : :
2004 : : /*
2005 : : * On the first pass, we collect main tables to vacuum, and also the main
2006 : : * table relid to TOAST relid mapping.
2007 : : */
7432 tgl@sss.pgh.pa.us 2008 [ + + ]: 20165 : while ((tuple = heap_getnext(relScan, ForwardScanDirection)) != NULL)
2009 : : {
2010 : 20130 : Form_pg_class classForm = (Form_pg_class) GETSTRUCT(tuple);
2011 : : PgStat_StatTabEntry *tabentry;
2012 : : AutoVacOpts *relopts;
2013 : : Oid relid;
2014 : : bool dovacuum;
2015 : : bool doanalyze;
2016 : : bool wraparound;
2017 : :
4671 kgrittn@postgresql.o 2018 [ + + ]: 20130 : if (classForm->relkind != RELKIND_RELATION &&
1583 alvherre@alvh.no-ip. 2019 [ + + ]: 15584 : classForm->relkind != RELKIND_MATVIEW)
4671 kgrittn@postgresql.o 2020 : 15575 : continue;
2021 : :
2583 andres@anarazel.de 2022 : 4582 : relid = classForm->oid;
2023 : :
2024 : : /*
2025 : : * Check if it is a temp table (presumably, of some other backend's).
2026 : : * We cannot safely process other backends' temp tables.
2027 : : */
5482 rhaas@postgresql.org 2028 [ + + ]: 4582 : if (classForm->relpersistence == RELPERSISTENCE_TEMP)
2029 : : {
2030 : : /*
2031 : : * We just ignore it if the owning backend is still active and
2032 : : * using the temporary schema. Also, for safety, ignore it if the
2033 : : * namespace doesn't exist or isn't a temp namespace after all.
2034 : : */
2118 tgl@sss.pgh.pa.us 2035 [ - + ]: 27 : if (checkTempNamespaceStatus(classForm->relnamespace) == TEMP_NAMESPACE_IDLE)
2036 : : {
2037 : : /*
2038 : : * The table seems to be orphaned -- although it might be that
2039 : : * the owning backend has already deleted it and exited; our
2040 : : * pg_class scan snapshot is not necessarily up-to-date
2041 : : * anymore, so we could be looking at a committed-dead entry.
2042 : : * Remember it so we can try to delete it later.
2043 : : */
3312 rhaas@postgresql.org 2044 :UBC 0 : orphan_oids = lappend_oid(orphan_oids, relid);
2045 : : }
3306 tgl@sss.pgh.pa.us 2046 :CBC 27 : continue;
2047 : : }
2048 : :
2049 : : /* Fetch reloptions and the pgstat entry for this table */
2050 : 4555 : relopts = extract_autovac_opts(tuple, pg_class_desc);
1350 andres@anarazel.de 2051 : 4555 : tabentry = pgstat_fetch_stat_tabentry_ext(classForm->relisshared,
2052 : : relid);
2053 : :
2054 : : /* Check if it needs vacuum or analyze */
3306 tgl@sss.pgh.pa.us 2055 : 4555 : relation_needs_vacanalyze(relid, relopts, classForm, tabentry,
2056 : : effective_multixact_freeze_max_age,
2057 : : &dovacuum, &doanalyze, &wraparound);
2058 : :
2059 : : /* Relations that need work are added to table_oids */
2060 [ + + + + ]: 4555 : if (dovacuum || doanalyze)
2061 : 344 : table_oids = lappend_oid(table_oids, relid);
2062 : :
2063 : : /*
2064 : : * Remember TOAST associations for the second pass. Note: we must do
2065 : : * this whether or not the table is going to be vacuumed, because we
2066 : : * don't automatically vacuum toast tables along the parent table.
2067 : : */
2068 [ + + ]: 4555 : if (OidIsValid(classForm->reltoastrelid))
2069 : : {
2070 : : av_relation *hentry;
2071 : : bool found;
2072 : :
2073 : 4406 : hentry = hash_search(table_toast_map,
2074 : 2203 : &classForm->reltoastrelid,
2075 : : HASH_ENTER, &found);
2076 : :
2077 [ + - ]: 2203 : if (!found)
2078 : : {
2079 : : /* hash_search already filled in the key */
2080 : 2203 : hentry->ar_relid = relid;
2081 : 2203 : hentry->ar_hasrelopts = false;
2082 [ + + ]: 2203 : if (relopts != NULL)
2083 : : {
2084 : 42 : hentry->ar_hasrelopts = true;
2085 : 42 : memcpy(&hentry->ar_reloptions, relopts,
2086 : : sizeof(AutoVacOpts));
2087 : : }
2088 : : }
2089 : : }
2090 : :
2091 : : /* Release stuff to avoid per-relation leakage */
207 2092 [ + + ]: 4555 : if (relopts)
2093 : 93 : pfree(relopts);
2094 [ + + ]: 4555 : if (tabentry)
2095 : 3454 : pfree(tabentry);
2096 : : }
2097 : :
2472 andres@anarazel.de 2098 : 35 : table_endscan(relScan);
2099 : :
2100 : : /* second pass: check TOAST tables */
6334 alvherre@alvh.no-ip. 2101 : 35 : ScanKeyInit(&key,
2102 : : Anum_pg_class_relkind,
2103 : : BTEqualStrategyNumber, F_CHAREQ,
2104 : : CharGetDatum(RELKIND_TOASTVALUE));
2105 : :
2472 andres@anarazel.de 2106 : 35 : relScan = table_beginscan_catalog(classRel, 1, &key);
6334 alvherre@alvh.no-ip. 2107 [ + + ]: 2258 : while ((tuple = heap_getnext(relScan, ForwardScanDirection)) != NULL)
2108 : : {
2109 : 2223 : Form_pg_class classForm = (Form_pg_class) GETSTRUCT(tuple);
2110 : : PgStat_StatTabEntry *tabentry;
2111 : : Oid relid;
2112 : : AutoVacOpts *relopts;
207 tgl@sss.pgh.pa.us 2113 : 2223 : bool free_relopts = false;
2114 : : bool dovacuum;
2115 : : bool doanalyze;
2116 : : bool wraparound;
2117 : :
2118 : : /*
2119 : : * We cannot safely process other backends' temp tables, so skip 'em.
2120 : : */
5482 rhaas@postgresql.org 2121 [ + + ]: 2223 : if (classForm->relpersistence == RELPERSISTENCE_TEMP)
6334 alvherre@alvh.no-ip. 2122 : 19 : continue;
2123 : :
2583 andres@anarazel.de 2124 : 2204 : relid = classForm->oid;
2125 : :
2126 : : /*
2127 : : * fetch reloptions -- if this toast table does not have them, try the
2128 : : * main rel
2129 : : */
6154 alvherre@alvh.no-ip. 2130 : 2204 : relopts = extract_autovac_opts(tuple, pg_class_desc);
207 tgl@sss.pgh.pa.us 2131 [ + + ]: 2204 : if (relopts)
207 tgl@sss.pgh.pa.us 2132 :GBC 1 : free_relopts = true;
2133 : : else
2134 : : {
2135 : : av_relation *hentry;
2136 : : bool found;
2137 : :
6154 alvherre@alvh.no-ip. 2138 :CBC 2203 : hentry = hash_search(table_toast_map, &relid, HASH_FIND, &found);
2139 [ + + + + ]: 2203 : if (found && hentry->ar_hasrelopts)
2140 : 41 : relopts = &hentry->ar_reloptions;
2141 : : }
2142 : :
2143 : : /* Fetch the pgstat entry for this table */
1350 andres@anarazel.de 2144 : 2204 : tabentry = pgstat_fetch_stat_tabentry_ext(classForm->relisshared,
2145 : : relid);
2146 : :
6154 alvherre@alvh.no-ip. 2147 : 2204 : relation_needs_vacanalyze(relid, relopts, classForm, tabentry,
2148 : : effective_multixact_freeze_max_age,
2149 : : &dovacuum, &doanalyze, &wraparound);
2150 : :
2151 : : /* ignore analyze for toast tables */
6334 2152 [ + + ]: 2204 : if (dovacuum)
2153 : 4 : table_oids = lappend_oid(table_oids, relid);
2154 : :
2155 : : /* Release stuff to avoid leakage */
207 tgl@sss.pgh.pa.us 2156 [ + + ]: 2204 : if (free_relopts)
207 tgl@sss.pgh.pa.us 2157 :GBC 1 : pfree(relopts);
207 tgl@sss.pgh.pa.us 2158 [ + + ]:CBC 2204 : if (tabentry)
2159 : 1566 : pfree(tabentry);
2160 : : }
2161 : :
2472 andres@anarazel.de 2162 : 35 : table_endscan(relScan);
2521 2163 : 35 : table_close(classRel, AccessShareLock);
2164 : :
2165 : : /*
2166 : : * Recheck orphan temporary tables, and if they still seem orphaned, drop
2167 : : * them. We'll eat a transaction per dropped table, which might seem
2168 : : * excessive, but we should only need to do anything as a result of a
2169 : : * previous backend crash, so this should not happen often enough to
2170 : : * justify "optimizing". Using separate transactions ensures that we
2171 : : * don't bloat the lock table if there are many temp tables to be dropped,
2172 : : * and it ensures that we don't lose work if a deletion attempt fails.
2173 : : */
3306 tgl@sss.pgh.pa.us 2174 [ - + - - : 35 : foreach(cell, orphan_oids)
- + ]
2175 : : {
3306 tgl@sss.pgh.pa.us 2176 :UBC 0 : Oid relid = lfirst_oid(cell);
2177 : : Form_pg_class classForm;
2178 : : ObjectAddress object;
2179 : :
2180 : : /*
2181 : : * Check for user-requested abort.
2182 : : */
2183 [ # # ]: 0 : CHECK_FOR_INTERRUPTS();
2184 : :
2185 : : /*
2186 : : * Try to lock the table. If we can't get the lock immediately,
2187 : : * somebody else is using (or dropping) the table, so it's not our
2188 : : * concern anymore. Having the lock prevents race conditions below.
2189 : : */
2190 [ # # ]: 0 : if (!ConditionalLockRelationOid(relid, AccessExclusiveLock))
2191 : 0 : continue;
2192 : :
2193 : : /*
2194 : : * Re-fetch the pg_class tuple and re-check whether it still seems to
2195 : : * be an orphaned temp table. If it's not there or no longer the same
2196 : : * relation, ignore it.
2197 : : */
2198 : 0 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
2199 [ # # ]: 0 : if (!HeapTupleIsValid(tuple))
2200 : : {
2201 : : /* be sure to drop useless lock so we don't bloat lock table */
2202 : 0 : UnlockRelationOid(relid, AccessExclusiveLock);
2203 : 0 : continue;
2204 : : }
2205 : 0 : classForm = (Form_pg_class) GETSTRUCT(tuple);
2206 : :
2207 : : /*
2208 : : * Make all the same tests made in the loop above. In event of OID
2209 : : * counter wraparound, the pg_class entry we have now might be
2210 : : * completely unrelated to the one we saw before.
2211 : : */
2212 [ # # ]: 0 : if (!((classForm->relkind == RELKIND_RELATION ||
2213 [ # # ]: 0 : classForm->relkind == RELKIND_MATVIEW) &&
2214 [ # # ]: 0 : classForm->relpersistence == RELPERSISTENCE_TEMP))
2215 : : {
2216 : 0 : UnlockRelationOid(relid, AccessExclusiveLock);
2217 : 0 : continue;
2218 : : }
2219 : :
2118 2220 [ # # ]: 0 : if (checkTempNamespaceStatus(classForm->relnamespace) != TEMP_NAMESPACE_IDLE)
2221 : : {
3306 2222 : 0 : UnlockRelationOid(relid, AccessExclusiveLock);
2223 : 0 : continue;
2224 : : }
2225 : :
2226 : : /*
2227 : : * Try to lock the temp namespace, too. Even though we have lock on
2228 : : * the table itself, there's a risk of deadlock against an incoming
2229 : : * backend trying to clean out the temp namespace, in case this table
2230 : : * has dependencies (such as sequences) that the backend's
2231 : : * performDeletion call might visit in a different order. If we can
2232 : : * get AccessShareLock on the namespace, that's sufficient to ensure
2233 : : * we're not running concurrently with RemoveTempRelations. If we
2234 : : * can't, back off and let RemoveTempRelations do its thing.
2235 : : */
623 2236 [ # # ]: 0 : if (!ConditionalLockDatabaseObject(NamespaceRelationId,
2237 : : classForm->relnamespace, 0,
2238 : : AccessShareLock))
2239 : : {
2240 : 0 : UnlockRelationOid(relid, AccessExclusiveLock);
2241 : 0 : continue;
2242 : : }
2243 : :
2244 : : /* OK, let's delete it */
3306 2245 [ # # ]: 0 : ereport(LOG,
2246 : : (errmsg("autovacuum: dropping orphan temp table \"%s.%s.%s\"",
2247 : : get_database_name(MyDatabaseId),
2248 : : get_namespace_name(classForm->relnamespace),
2249 : : NameStr(classForm->relname))));
2250 : :
2251 : : /*
2252 : : * Deletion might involve TOAST table access, so ensure we have a
2253 : : * valid snapshot.
2254 : : */
200 nathan@postgresql.or 2255 : 0 : PushActiveSnapshot(GetTransactionSnapshot());
2256 : :
3306 tgl@sss.pgh.pa.us 2257 : 0 : object.classId = RelationRelationId;
2258 : 0 : object.objectId = relid;
2259 : 0 : object.objectSubId = 0;
3301 2260 : 0 : performDeletion(&object, DROP_CASCADE,
2261 : : PERFORM_DELETION_INTERNAL |
2262 : : PERFORM_DELETION_QUIETLY |
2263 : : PERFORM_DELETION_SKIP_EXTENSIONS);
2264 : :
2265 : : /*
2266 : : * To commit the deletion, end current transaction and start a new
2267 : : * one. Note this also releases the locks we took.
2268 : : */
200 nathan@postgresql.or 2269 : 0 : PopActiveSnapshot();
3312 rhaas@postgresql.org 2270 : 0 : CommitTransactionCommand();
2271 : 0 : StartTransactionCommand();
2272 : :
2273 : : /* StartTransactionCommand changed current memory context */
2274 : 0 : MemoryContextSwitchTo(AutovacMemCxt);
2275 : : }
2276 : :
2277 : : /*
2278 : : * Optionally, create a buffer access strategy object for VACUUM to use.
2279 : : * We use the same BufferAccessStrategy object for all tables VACUUMed by
2280 : : * this worker to prevent autovacuum from blowing out shared buffers.
2281 : : *
2282 : : * VacuumBufferUsageLimit being set to 0 results in
2283 : : * GetAccessStrategyWithSize returning NULL, effectively meaning we can
2284 : : * use up to all of shared buffers.
2285 : : *
2286 : : * If we later enter failsafe mode on any of the tables being vacuumed, we
2287 : : * will cease use of the BufferAccessStrategy only for that table.
2288 : : *
2289 : : * XXX should we consider adding code to adjust the size of this if
2290 : : * VacuumBufferUsageLimit changes?
2291 : : */
984 drowley@postgresql.o 2292 :CBC 35 : bstrategy = GetAccessStrategyWithSize(BAS_VACUUM, VacuumBufferUsageLimit);
2293 : :
2294 : : /*
2295 : : * create a memory context to act as fake PortalContext, so that the
2296 : : * contexts created in the vacuum code are cleaned up for each table.
2297 : : */
6744 alvherre@alvh.no-ip. 2298 : 35 : PortalContext = AllocSetContextCreate(AutovacMemCxt,
2299 : : "Autovacuum Portal",
2300 : : ALLOCSET_DEFAULT_SIZES);
2301 : :
2302 : : /*
2303 : : * Perform operations on collected tables.
2304 : : */
6838 2305 [ + + + + : 379 : foreach(cell, table_oids)
+ + ]
2306 : : {
6606 bruce@momjian.us 2307 : 345 : Oid relid = lfirst_oid(cell);
2308 : : HeapTuple classTup;
2309 : : autovac_table *tab;
2310 : : bool isshared;
2311 : : bool skipit;
2312 : : dlist_iter iter;
2313 : :
7445 tgl@sss.pgh.pa.us 2314 [ - + ]: 345 : CHECK_FOR_INTERRUPTS();
2315 : :
2316 : : /*
2317 : : * Check for config changes before processing each collected table.
2318 : : */
2191 rhaas@postgresql.org 2319 [ - + ]: 345 : if (ConfigReloadPending)
2320 : : {
2191 rhaas@postgresql.org 2321 :UBC 0 : ConfigReloadPending = false;
3910 alvherre@alvh.no-ip. 2322 : 0 : ProcessConfigFile(PGC_SIGHUP);
2323 : :
2324 : : /*
2325 : : * You might be tempted to bail out if we see autovacuum is now
2326 : : * disabled. Must resist that temptation -- this might be a
2327 : : * for-wraparound emergency worker, in which case that would be
2328 : : * entirely inappropriate.
2329 : : */
2330 : : }
2331 : :
2332 : : /*
2333 : : * Find out whether the table is shared or not. (It's slightly
2334 : : * annoying to fetch the syscache entry just for this, but in typical
2335 : : * cases it adds little cost because table_recheck_autovac would
2336 : : * refetch the entry anyway. We could buy that back by copying the
2337 : : * tuple here and passing it to table_recheck_autovac, but that
2338 : : * increases the odds of that function working with stale data.)
2339 : : */
2835 tgl@sss.pgh.pa.us 2340 :CBC 345 : classTup = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
2341 [ + + ]: 345 : if (!HeapTupleIsValid(classTup))
2342 : 1 : continue; /* somebody deleted the rel, forget it */
2343 : 344 : isshared = ((Form_pg_class) GETSTRUCT(classTup))->relisshared;
2344 : 344 : ReleaseSysCache(classTup);
2345 : :
2346 : : /*
2347 : : * Hold schedule lock from here until we've claimed the table. We
2348 : : * also need the AutovacuumLock to walk the worker array, but that one
2349 : : * can just be a shared lock.
2350 : : */
6819 alvherre@alvh.no-ip. 2351 : 344 : LWLockAcquire(AutovacuumScheduleLock, LW_EXCLUSIVE);
2352 : 344 : LWLockAcquire(AutovacuumLock, LW_SHARED);
2353 : :
2354 : : /*
2355 : : * Check whether the table is being vacuumed concurrently by another
2356 : : * worker.
2357 : : */
2358 : 344 : skipit = false;
4809 2359 [ + - + + ]: 688 : dlist_foreach(iter, &AutoVacuumShmem->av_runningWorkers)
2360 : : {
2361 : 344 : WorkerInfo worker = dlist_container(WorkerInfoData, wi_links, iter.cur);
2362 : :
2363 : : /* ignore myself */
6819 2364 [ + - ]: 344 : if (worker == MyWorkerInfo)
4809 2365 : 344 : continue;
2366 : :
2367 : : /* ignore workers in other databases (unless table is shared) */
3507 alvherre@alvh.no-ip. 2368 [ # # # # ]:UBC 0 : if (!worker->wi_sharedrel && worker->wi_dboid != MyDatabaseId)
4809 2369 : 0 : continue;
2370 : :
6819 2371 [ # # ]: 0 : if (worker->wi_tableoid == relid)
2372 : : {
2373 : 0 : skipit = true;
3252 rhaas@postgresql.org 2374 : 0 : found_concurrent_worker = true;
6819 alvherre@alvh.no-ip. 2375 : 0 : break;
2376 : : }
2377 : : }
6819 alvherre@alvh.no-ip. 2378 :CBC 344 : LWLockRelease(AutovacuumLock);
2379 [ - + ]: 344 : if (skipit)
2380 : : {
6819 alvherre@alvh.no-ip. 2381 :UBC 0 : LWLockRelease(AutovacuumScheduleLock);
2382 : 0 : continue;
2383 : : }
2384 : :
2385 : : /*
2386 : : * Store the table's OID in shared memory before releasing the
2387 : : * schedule lock, so that other workers don't try to vacuum it
2388 : : * concurrently. (We claim it here so as not to hold
2389 : : * AutovacuumScheduleLock while rechecking the stats.)
2390 : : */
2835 tgl@sss.pgh.pa.us 2391 :CBC 344 : MyWorkerInfo->wi_tableoid = relid;
2392 : 344 : MyWorkerInfo->wi_sharedrel = isshared;
2393 : 344 : LWLockRelease(AutovacuumScheduleLock);
2394 : :
2395 : : /*
2396 : : * Check whether pgstat data still says we need to vacuum this table.
2397 : : * It could have changed if something else processed the table while
2398 : : * we weren't looking. This doesn't entirely close the race condition,
2399 : : * but it is very small.
2400 : : */
6744 alvherre@alvh.no-ip. 2401 : 344 : MemoryContextSwitchTo(AutovacMemCxt);
3875 rhaas@postgresql.org 2402 : 344 : tab = table_recheck_autovac(relid, table_toast_map, pg_class_desc,
2403 : : effective_multixact_freeze_max_age);
6838 alvherre@alvh.no-ip. 2404 [ - + ]: 344 : if (tab == NULL)
2405 : : {
2406 : : /* someone else vacuumed the table, or it went away */
2835 tgl@sss.pgh.pa.us 2407 :UBC 0 : LWLockAcquire(AutovacuumScheduleLock, LW_EXCLUSIVE);
2408 : 0 : MyWorkerInfo->wi_tableoid = InvalidOid;
2409 : 0 : MyWorkerInfo->wi_sharedrel = false;
6819 alvherre@alvh.no-ip. 2410 : 0 : LWLockRelease(AutovacuumScheduleLock);
7428 tgl@sss.pgh.pa.us 2411 : 0 : continue;
2412 : : }
2413 : :
2414 : : /*
2415 : : * Save the cost-related storage parameter values in global variables
2416 : : * for reference when updating vacuum_cost_delay and vacuum_cost_limit
2417 : : * during vacuuming this table.
2418 : : */
984 dgustafsson@postgres 2419 :CBC 344 : av_storage_param_cost_delay = tab->at_storage_param_vac_cost_delay;
2420 : 344 : av_storage_param_cost_limit = tab->at_storage_param_vac_cost_limit;
2421 : :
2422 : : /*
2423 : : * We only expect this worker to ever set the flag, so don't bother
2424 : : * checking the return value. We shouldn't have to retry.
2425 : : */
2426 [ + - ]: 344 : if (tab->at_dobalance)
2427 : 344 : pg_atomic_test_set_flag(&MyWorkerInfo->wi_dobalance);
2428 : : else
984 dgustafsson@postgres 2429 :UBC 0 : pg_atomic_clear_flag(&MyWorkerInfo->wi_dobalance);
2430 : :
984 dgustafsson@postgres 2431 :CBC 344 : LWLockAcquire(AutovacuumLock, LW_SHARED);
2432 : 344 : autovac_recalculate_workers_for_balance();
2433 : 344 : LWLockRelease(AutovacuumLock);
2434 : :
2435 : : /*
2436 : : * We wait until this point to update cost delay and cost limit
2437 : : * values, even though we reloaded the configuration file above, so
2438 : : * that we can take into account the cost-related storage parameters.
2439 : : */
2440 : 344 : VacuumUpdateCosts();
2441 : :
2442 : :
2443 : : /* clean up memory before each iteration */
762 nathan@postgresql.or 2444 : 344 : MemoryContextReset(PortalContext);
2445 : :
2446 : : /*
2447 : : * Save the relation name for a possible error message, to avoid a
2448 : : * catalog lookup in case of an error. If any of these return NULL,
2449 : : * then the relation has been dropped since last we checked; skip it.
2450 : : * Note: they must live in a long-lived memory context because we call
2451 : : * vacuum and analyze in different transactions.
2452 : : */
2453 : :
6361 alvherre@alvh.no-ip. 2454 : 344 : tab->at_relname = get_rel_name(tab->at_relid);
2455 : 344 : tab->at_nspname = get_namespace_name(get_rel_namespace(tab->at_relid));
2456 : 344 : tab->at_datname = get_database_name(MyDatabaseId);
2457 [ + - + - : 344 : if (!tab->at_relname || !tab->at_nspname || !tab->at_datname)
- + ]
6361 alvherre@alvh.no-ip. 2458 :UBC 0 : goto deleted;
2459 : :
2460 : : /*
2461 : : * We will abort vacuuming the current table if something errors out,
2462 : : * and continue with the next one in schedule; in particular, this
2463 : : * happens if we are interrupted with SIGINT.
2464 : : */
6745 alvherre@alvh.no-ip. 2465 [ + - ]:CBC 344 : PG_TRY();
2466 : : {
2467 : : /* Use PortalContext for any per-table allocations */
3006 tgl@sss.pgh.pa.us 2468 : 344 : MemoryContextSwitchTo(PortalContext);
2469 : :
2470 : : /* have at it */
6361 alvherre@alvh.no-ip. 2471 : 344 : autovacuum_do_vac_analyze(tab, bstrategy);
2472 : :
2473 : : /*
2474 : : * Clear a possible query-cancel signal, to avoid a late reaction
2475 : : * to an automatically-sent signal because of vacuuming the
2476 : : * current table (we're done with it, so it would make no sense to
2477 : : * cancel at this point.)
2478 : : */
6626 2479 : 343 : QueryCancelPending = false;
2480 : : }
6745 alvherre@alvh.no-ip. 2481 :UBC 0 : PG_CATCH();
2482 : : {
2483 : : /*
2484 : : * Abort the transaction, start a new one, and proceed with the
2485 : : * next table in our list.
2486 : : */
6628 2487 : 0 : HOLD_INTERRUPTS();
2465 rhaas@postgresql.org 2488 [ # # ]: 0 : if (tab->at_params.options & VACOPT_VACUUM)
6628 alvherre@alvh.no-ip. 2489 : 0 : errcontext("automatic vacuum of table \"%s.%s.%s\"",
2490 : : tab->at_datname, tab->at_nspname, tab->at_relname);
2491 : : else
2492 : 0 : errcontext("automatic analyze of table \"%s.%s.%s\"",
2493 : : tab->at_datname, tab->at_nspname, tab->at_relname);
2494 : 0 : EmitErrorReport();
2495 : :
2496 : : /* this resets ProcGlobal->statusFlags[i] too */
2497 : 0 : AbortOutOfAnyTransaction();
2498 : 0 : FlushErrorState();
762 nathan@postgresql.or 2499 : 0 : MemoryContextReset(PortalContext);
2500 : :
2501 : : /* restart our transaction for the following operations */
6628 alvherre@alvh.no-ip. 2502 : 0 : StartTransactionCommand();
2503 [ # # ]: 0 : RESUME_INTERRUPTS();
2504 : : }
6745 alvherre@alvh.no-ip. 2505 [ - + ]:CBC 343 : PG_END_TRY();
2506 : :
2507 : : /* Make sure we're back in AutovacMemCxt */
3006 tgl@sss.pgh.pa.us 2508 : 343 : MemoryContextSwitchTo(AutovacMemCxt);
2509 : :
3252 rhaas@postgresql.org 2510 : 343 : did_vacuum = true;
2511 : :
2512 : : /* ProcGlobal->statusFlags[i] are reset at the next end of xact */
2513 : :
2514 : : /* be tidy */
6361 alvherre@alvh.no-ip. 2515 : 343 : deleted:
2516 [ + - ]: 343 : if (tab->at_datname != NULL)
2517 : 343 : pfree(tab->at_datname);
2518 [ + - ]: 343 : if (tab->at_nspname != NULL)
2519 : 343 : pfree(tab->at_nspname);
2520 [ + - ]: 343 : if (tab->at_relname != NULL)
2521 : 343 : pfree(tab->at_relname);
6838 2522 : 343 : pfree(tab);
2523 : :
2524 : : /*
2525 : : * Remove my info from shared memory. We set wi_dobalance on the
2526 : : * assumption that we are more likely than not to vacuum a table with
2527 : : * no cost-related storage parameters next, so we want to claim our
2528 : : * share of I/O as soon as possible to avoid thrashing the global
2529 : : * balance.
2530 : : */
2835 tgl@sss.pgh.pa.us 2531 : 343 : LWLockAcquire(AutovacuumScheduleLock, LW_EXCLUSIVE);
6628 alvherre@alvh.no-ip. 2532 : 343 : MyWorkerInfo->wi_tableoid = InvalidOid;
3507 2533 : 343 : MyWorkerInfo->wi_sharedrel = false;
2835 tgl@sss.pgh.pa.us 2534 : 343 : LWLockRelease(AutovacuumScheduleLock);
984 dgustafsson@postgres 2535 : 343 : pg_atomic_test_set_flag(&MyWorkerInfo->wi_dobalance);
2536 : : }
2537 : :
207 tgl@sss.pgh.pa.us 2538 : 34 : list_free(table_oids);
2539 : :
2540 : : /*
2541 : : * Perform additional work items, as requested by backends.
2542 : : */
3045 alvherre@alvh.no-ip. 2543 : 34 : LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
2544 [ + + ]: 8738 : for (i = 0; i < NUM_WORKITEMS; i++)
2545 : : {
2546 : 8704 : AutoVacuumWorkItem *workitem = &AutoVacuumShmem->av_workItems[i];
2547 : :
2548 [ + + ]: 8704 : if (!workitem->avw_used)
2549 : 8698 : continue;
2550 [ - + ]: 6 : if (workitem->avw_active)
3045 alvherre@alvh.no-ip. 2551 :UBC 0 : continue;
2969 alvherre@alvh.no-ip. 2552 [ - + ]:CBC 6 : if (workitem->avw_database != MyDatabaseId)
2969 alvherre@alvh.no-ip. 2553 :UBC 0 : continue;
2554 : :
2555 : : /* claim this one, and release lock while performing it */
3045 alvherre@alvh.no-ip. 2556 :CBC 6 : workitem->avw_active = true;
2557 : 6 : LWLockRelease(AutovacuumLock);
2558 : :
42 alvherre@kurilemu.de 2559 : 6 : PushActiveSnapshot(GetTransactionSnapshot());
3045 alvherre@alvh.no-ip. 2560 : 6 : perform_work_item(workitem);
42 alvherre@kurilemu.de 2561 [ + - ]: 6 : if (ActiveSnapshotSet()) /* transaction could have aborted */
2562 : 6 : PopActiveSnapshot();
2563 : :
2564 : : /*
2565 : : * Check for config changes before acquiring lock for further jobs.
2566 : : */
3045 alvherre@alvh.no-ip. 2567 [ - + ]: 6 : CHECK_FOR_INTERRUPTS();
2191 rhaas@postgresql.org 2568 [ - + ]: 6 : if (ConfigReloadPending)
2569 : : {
2191 rhaas@postgresql.org 2570 :UBC 0 : ConfigReloadPending = false;
3045 alvherre@alvh.no-ip. 2571 : 0 : ProcessConfigFile(PGC_SIGHUP);
984 dgustafsson@postgres 2572 : 0 : VacuumUpdateCosts();
2573 : : }
2574 : :
3045 alvherre@alvh.no-ip. 2575 :CBC 6 : LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
2576 : :
2577 : : /* and mark it done */
2578 : 6 : workitem->avw_active = false;
2579 : 6 : workitem->avw_used = false;
2580 : : }
2581 : 34 : LWLockRelease(AutovacuumLock);
2582 : :
2583 : : /*
2584 : : * We leak table_toast_map here (among other things), but since we're
2585 : : * going away soon, it's not a problem normally. But when using Valgrind,
2586 : : * release some stuff to reduce complaints about leaked storage.
2587 : : */
2588 : : #ifdef USE_VALGRIND
2589 : : hash_destroy(table_toast_map);
2590 : : FreeTupleDesc(pg_class_desc);
2591 : : if (bstrategy)
2592 : : pfree(bstrategy);
2593 : : #endif
2594 : :
2595 : : /* Run the rest in xact context, mainly to avoid Valgrind leak warnings */
136 tgl@sss.pgh.pa.us 2596 :GNC 34 : MemoryContextSwitchTo(TopTransactionContext);
2597 : :
2598 : : /*
2599 : : * Update pg_database.datfrozenxid, and truncate pg_xact if possible. We
2600 : : * only need to do this once, not after each table.
2601 : : *
2602 : : * Even if we didn't vacuum anything, it may still be important to do
2603 : : * this, because one indirect effect of vac_update_datfrozenxid() is to
2604 : : * update TransamVariables->xidVacLimit. That might need to be done even
2605 : : * if we haven't vacuumed anything, because relations with older
2606 : : * relfrozenxid values or other databases with older datfrozenxid values
2607 : : * might have been dropped, allowing xidVacLimit to advance.
2608 : : *
2609 : : * However, it's also important not to do this blindly in all cases,
2610 : : * because when autovacuum=off this will restart the autovacuum launcher.
2611 : : * If we're not careful, an infinite loop can result, where workers find
2612 : : * no work to do and restart the launcher, which starts another worker in
2613 : : * the same database that finds no work to do. To prevent that, we skip
2614 : : * this if (1) we found no work to do and (2) we skipped at least one
2615 : : * table due to concurrent autovacuum activity. In that case, the other
2616 : : * worker has already done it, or will do so when it finishes.
2617 : : */
3252 rhaas@postgresql.org 2618 [ + + + - ]:CBC 34 : if (did_vacuum || !found_concurrent_worker)
2619 : 34 : vac_update_datfrozenxid();
2620 : :
2621 : : /* Finally close out the last transaction. */
7460 tgl@sss.pgh.pa.us 2622 : 34 : CommitTransactionCommand();
2623 : 34 : }
2624 : :
2625 : : /*
2626 : : * Execute a previously registered work item.
2627 : : */
2628 : : static void
3181 alvherre@alvh.no-ip. 2629 : 6 : perform_work_item(AutoVacuumWorkItem *workitem)
2630 : : {
2631 : 6 : char *cur_datname = NULL;
2632 : 6 : char *cur_nspname = NULL;
2633 : 6 : char *cur_relname = NULL;
2634 : :
2635 : : /*
2636 : : * Note we do not store table info in MyWorkerInfo, since this is not
2637 : : * vacuuming proper.
2638 : : */
2639 : :
2640 : : /*
2641 : : * Save the relation name for a possible error message, to avoid a catalog
2642 : : * lookup in case of an error. If any of these return NULL, then the
2643 : : * relation has been dropped since last we checked; skip it.
2644 : : */
3006 tgl@sss.pgh.pa.us 2645 [ - + ]: 6 : Assert(CurrentMemoryContext == AutovacMemCxt);
2646 : :
3181 alvherre@alvh.no-ip. 2647 : 6 : cur_relname = get_rel_name(workitem->avw_relation);
2648 : 6 : cur_nspname = get_namespace_name(get_rel_namespace(workitem->avw_relation));
2649 : 6 : cur_datname = get_database_name(MyDatabaseId);
2650 [ + - + - : 6 : if (!cur_relname || !cur_nspname || !cur_datname)
- + ]
3181 alvherre@alvh.no-ip. 2651 :UBC 0 : goto deleted2;
2652 : :
2489 alvherre@alvh.no-ip. 2653 :CBC 6 : autovac_report_workitem(workitem, cur_nspname, cur_relname);
2654 : :
2655 : : /* clean up memory before each work item */
762 nathan@postgresql.or 2656 : 6 : MemoryContextReset(PortalContext);
2657 : :
2658 : : /*
2659 : : * We will abort the current work item if something errors out, and
2660 : : * continue with the next one; in particular, this happens if we are
2661 : : * interrupted with SIGINT. Note that this means that the work item list
2662 : : * can be lossy.
2663 : : */
3181 alvherre@alvh.no-ip. 2664 [ + - ]: 6 : PG_TRY();
2665 : : {
2666 : : /* Use PortalContext for any per-work-item allocations */
3006 tgl@sss.pgh.pa.us 2667 : 6 : MemoryContextSwitchTo(PortalContext);
2668 : :
2669 : : /*
2670 : : * Have at it. Functions called here are responsible for any required
2671 : : * user switch and sandbox.
2672 : : */
3181 alvherre@alvh.no-ip. 2673 [ + - ]: 6 : switch (workitem->avw_type)
2674 : : {
2675 : 6 : case AVW_BRINSummarizeRange:
2676 : 6 : DirectFunctionCall2(brin_summarize_range,
2677 : : ObjectIdGetDatum(workitem->avw_relation),
2678 : : Int64GetDatum((int64) workitem->avw_blockNumber));
2679 : 6 : break;
3181 alvherre@alvh.no-ip. 2680 :UBC 0 : default:
2681 [ # # ]: 0 : elog(WARNING, "unrecognized work item found: type %d",
2682 : : workitem->avw_type);
2683 : 0 : break;
2684 : : }
2685 : :
2686 : : /*
2687 : : * Clear a possible query-cancel signal, to avoid a late reaction to
2688 : : * an automatically-sent signal because of vacuuming the current table
2689 : : * (we're done with it, so it would make no sense to cancel at this
2690 : : * point.)
2691 : : */
3181 alvherre@alvh.no-ip. 2692 :CBC 6 : QueryCancelPending = false;
2693 : : }
3181 alvherre@alvh.no-ip. 2694 :UBC 0 : PG_CATCH();
2695 : : {
2696 : : /*
2697 : : * Abort the transaction, start a new one, and proceed with the next
2698 : : * table in our list.
2699 : : */
2700 : 0 : HOLD_INTERRUPTS();
2701 : 0 : errcontext("processing work entry for relation \"%s.%s.%s\"",
2702 : : cur_datname, cur_nspname, cur_relname);
2703 : 0 : EmitErrorReport();
2704 : :
2705 : : /* this resets ProcGlobal->statusFlags[i] too */
2706 : 0 : AbortOutOfAnyTransaction();
2707 : 0 : FlushErrorState();
762 nathan@postgresql.or 2708 : 0 : MemoryContextReset(PortalContext);
2709 : :
2710 : : /* restart our transaction for the following operations */
3181 alvherre@alvh.no-ip. 2711 : 0 : StartTransactionCommand();
2712 [ # # ]: 0 : RESUME_INTERRUPTS();
2713 : : }
3181 alvherre@alvh.no-ip. 2714 [ - + ]:CBC 6 : PG_END_TRY();
2715 : :
2716 : : /* Make sure we're back in AutovacMemCxt */
3006 tgl@sss.pgh.pa.us 2717 : 6 : MemoryContextSwitchTo(AutovacMemCxt);
2718 : :
2719 : : /* We intentionally do not set did_vacuum here */
2720 : :
2721 : : /* be tidy */
3181 alvherre@alvh.no-ip. 2722 : 6 : deleted2:
2723 [ + - ]: 6 : if (cur_datname)
2724 : 6 : pfree(cur_datname);
2725 [ + - ]: 6 : if (cur_nspname)
2726 : 6 : pfree(cur_nspname);
2727 [ + - ]: 6 : if (cur_relname)
2728 : 6 : pfree(cur_relname);
2729 : 6 : }
2730 : :
2731 : : /*
2732 : : * extract_autovac_opts
2733 : : *
2734 : : * Given a relation's pg_class tuple, return a palloc'd copy of the
2735 : : * AutoVacOpts portion of reloptions, if set; otherwise, return NULL.
2736 : : *
2737 : : * Note: callers do not have a relation lock on the table at this point,
2738 : : * so the table could have been dropped, and its catalog rows gone, after
2739 : : * we acquired the pg_class row. If pg_class had a TOAST table, this would
2740 : : * be a risk; fortunately, it doesn't.
2741 : : */
2742 : : static AutoVacOpts *
6154 2743 : 7103 : extract_autovac_opts(HeapTuple tup, TupleDesc pg_class_desc)
2744 : : {
2745 : : bytea *relopts;
2746 : : AutoVacOpts *av;
2747 : :
2748 [ + + + + : 7103 : Assert(((Form_pg_class) GETSTRUCT(tup))->relkind == RELKIND_RELATION ||
- + ]
2749 : : ((Form_pg_class) GETSTRUCT(tup))->relkind == RELKIND_MATVIEW ||
2750 : : ((Form_pg_class) GETSTRUCT(tup))->relkind == RELKIND_TOASTVALUE);
2751 : :
614 akorotkov@postgresql 2752 : 7103 : relopts = extractRelOptions(tup, pg_class_desc, NULL);
2753 [ + + ]: 7103 : if (relopts == NULL)
2754 : 6998 : return NULL;
2755 : :
6 michael@paquier.xyz 2756 :GNC 105 : av = palloc_object(AutoVacOpts);
614 akorotkov@postgresql 2757 :CBC 105 : memcpy(av, &(((StdRdOptions *) relopts)->autovacuum), sizeof(AutoVacOpts));
2758 : 105 : pfree(relopts);
2759 : :
6154 alvherre@alvh.no-ip. 2760 : 105 : return av;
2761 : : }
2762 : :
2763 : :
2764 : : /*
2765 : : * table_recheck_autovac
2766 : : *
2767 : : * Recheck whether a table still needs vacuum or analyze. Return value is a
2768 : : * valid autovac_table pointer if it does, NULL otherwise.
2769 : : *
2770 : : * Note that the returned autovac_table does not have the name fields set.
2771 : : */
2772 : : static autovac_table *
2773 : 344 : table_recheck_autovac(Oid relid, HTAB *table_toast_map,
2774 : : TupleDesc pg_class_desc,
2775 : : int effective_multixact_freeze_max_age)
2776 : : {
2777 : : Form_pg_class classForm;
2778 : : HeapTuple classTup;
2779 : : bool dovacuum;
2780 : : bool doanalyze;
6838 2781 : 344 : autovac_table *tab = NULL;
2782 : : bool wraparound;
2783 : : AutoVacOpts *avopts;
207 tgl@sss.pgh.pa.us 2784 : 344 : bool free_avopts = false;
2785 : :
2786 : : /* fetch the relation's relcache entry */
5784 rhaas@postgresql.org 2787 : 344 : classTup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
6838 alvherre@alvh.no-ip. 2788 [ - + ]: 344 : if (!HeapTupleIsValid(classTup))
6838 alvherre@alvh.no-ip. 2789 :UBC 0 : return NULL;
6838 alvherre@alvh.no-ip. 2790 :CBC 344 : classForm = (Form_pg_class) GETSTRUCT(classTup);
2791 : :
2792 : : /*
2793 : : * Get the applicable reloptions. If it is a TOAST table, try to get the
2794 : : * main table reloptions if the toast table itself doesn't have.
2795 : : */
6154 2796 : 344 : avopts = extract_autovac_opts(classTup, pg_class_desc);
207 tgl@sss.pgh.pa.us 2797 [ + + ]: 344 : if (avopts)
2798 : 11 : free_avopts = true;
2799 [ + + + - ]: 333 : else if (classForm->relkind == RELKIND_TOASTVALUE &&
2800 : : table_toast_map != NULL)
2801 : : {
2802 : : av_relation *hentry;
2803 : : bool found;
2804 : :
6154 alvherre@alvh.no-ip. 2805 : 4 : hentry = hash_search(table_toast_map, &relid, HASH_FIND, &found);
2806 [ + - - + ]: 4 : if (found && hentry->ar_hasrelopts)
6154 alvherre@alvh.no-ip. 2807 :UBC 0 : avopts = &hentry->ar_reloptions;
2808 : : }
2809 : :
1834 fujii@postgresql.org 2810 :CBC 344 : recheck_relation_needs_vacanalyze(relid, avopts, classForm,
2811 : : effective_multixact_freeze_max_age,
2812 : : &dovacuum, &doanalyze, &wraparound);
2813 : :
2814 : : /* OK, it needs something done */
6334 alvherre@alvh.no-ip. 2815 [ + + + - ]: 344 : if (doanalyze || dovacuum)
2816 : : {
2817 : : int freeze_min_age;
2818 : : int freeze_table_age;
2819 : : int multixact_freeze_min_age;
2820 : : int multixact_freeze_table_age;
2821 : : int log_vacuum_min_duration;
2822 : : int log_analyze_min_duration;
2823 : :
2824 : : /*
2825 : : * Calculate the vacuum cost parameters and the freeze ages. If there
2826 : : * are options set in pg_class.reloptions, use them; in the case of a
2827 : : * toast table, try the main table too. Otherwise use the GUC
2828 : : * defaults, autovacuum's own first and plain vacuum second.
2829 : : */
2830 : :
2831 : : /* -1 in autovac setting means use log_autovacuum_min_duration */
62 peter@eisentraut.org 2832 [ - + ]:GNC 11 : log_vacuum_min_duration = (avopts && avopts->log_vacuum_min_duration >= 0)
2833 : : ? avopts->log_vacuum_min_duration
3910 alvherre@alvh.no-ip. 2834 [ + + ]:CBC 355 : : Log_autovacuum_min_duration;
2835 : :
2836 : : /* -1 in autovac setting means use log_autoanalyze_min_duration */
62 peter@eisentraut.org 2837 [ - + ]:GNC 11 : log_analyze_min_duration = (avopts && avopts->log_analyze_min_duration >= 0)
2838 : : ? avopts->log_analyze_min_duration
2839 [ + + ]: 355 : : Log_autoanalyze_min_duration;
2840 : :
2841 : : /* these do not have autovacuum-specific settings */
5955 alvherre@alvh.no-ip. 2842 [ - + ]:CBC 11 : freeze_min_age = (avopts && avopts->freeze_min_age >= 0)
2843 : : ? avopts->freeze_min_age
2844 [ + + ]: 355 : : default_freeze_min_age;
2845 : :
2846 [ - + ]: 11 : freeze_table_age = (avopts && avopts->freeze_table_age >= 0)
2847 : : ? avopts->freeze_table_age
2848 [ + + ]: 355 : : default_freeze_table_age;
2849 : :
4324 2850 : 355 : multixact_freeze_min_age = (avopts &&
2851 [ - + ]: 11 : avopts->multixact_freeze_min_age >= 0)
2852 : : ? avopts->multixact_freeze_min_age
2853 [ + + ]: 355 : : default_multixact_freeze_min_age;
2854 : :
2855 : 355 : multixact_freeze_table_age = (avopts &&
2856 [ - + ]: 11 : avopts->multixact_freeze_table_age >= 0)
2857 : : ? avopts->multixact_freeze_table_age
2858 [ + + ]: 355 : : default_multixact_freeze_table_age;
2859 : :
6 michael@paquier.xyz 2860 :GNC 344 : tab = palloc_object(autovac_table);
6838 alvherre@alvh.no-ip. 2861 :CBC 344 : tab->at_relid = relid;
3507 2862 : 344 : tab->at_sharedrel = classForm->relisshared;
2863 : :
2864 : : /*
2865 : : * Select VACUUM options. Note we don't say VACOPT_PROCESS_TOAST, so
2866 : : * that vacuum() skips toast relations. Also note we tell vacuum() to
2867 : : * skip vac_update_datfrozenxid(); we'll do that separately.
2868 : : */
1075 tgl@sss.pgh.pa.us 2869 : 344 : tab->at_params.options =
1016 michael@paquier.xyz 2870 : 344 : (dovacuum ? (VACOPT_VACUUM |
2871 : : VACOPT_PROCESS_MAIN |
2872 [ + + ]: 344 : VACOPT_SKIP_DATABASE_STATS) : 0) |
3926 alvherre@alvh.no-ip. 2873 [ + + ]: 344 : (doanalyze ? VACOPT_ANALYZE : 0) |
2714 michael@paquier.xyz 2874 [ + - ]: 344 : (!wraparound ? VACOPT_SKIP_LOCKED : 0);
2875 : :
2876 : : /*
2877 : : * index_cleanup and truncate are unspecified at first in autovacuum.
2878 : : * They will be filled in with usable values using their reloptions
2879 : : * (or reloption defaults) later.
2880 : : */
1642 pg@bowt.ie 2881 : 344 : tab->at_params.index_cleanup = VACOPTVALUE_UNSPECIFIED;
2882 : 344 : tab->at_params.truncate = VACOPTVALUE_UNSPECIFIED;
2883 : : /* As of now, we don't support parallel vacuum for autovacuum */
2157 akapila@postgresql.o 2884 : 344 : tab->at_params.nworkers = -1;
3926 alvherre@alvh.no-ip. 2885 : 344 : tab->at_params.freeze_min_age = freeze_min_age;
2886 : 344 : tab->at_params.freeze_table_age = freeze_table_age;
2887 : 344 : tab->at_params.multixact_freeze_min_age = multixact_freeze_min_age;
2888 : 344 : tab->at_params.multixact_freeze_table_age = multixact_freeze_table_age;
2889 : 344 : tab->at_params.is_wraparound = wraparound;
62 peter@eisentraut.org 2890 :GNC 344 : tab->at_params.log_vacuum_min_duration = log_vacuum_min_duration;
2891 : 344 : tab->at_params.log_analyze_min_duration = log_analyze_min_duration;
643 nathan@postgresql.or 2892 :CBC 344 : tab->at_params.toast_parent = InvalidOid;
2893 : :
2894 : : /*
2895 : : * Later, in vacuum_rel(), we check reloptions for any
2896 : : * vacuum_max_eager_freeze_failure_rate override.
2897 : : */
308 melanieplageman@gmai 2898 : 344 : tab->at_params.max_eager_freeze_failure_rate = vacuum_max_eager_freeze_failure_rate;
984 dgustafsson@postgres 2899 : 344 : tab->at_storage_param_vac_cost_limit = avopts ?
2900 [ + + ]: 344 : avopts->vacuum_cost_limit : 0;
2901 : 344 : tab->at_storage_param_vac_cost_delay = avopts ?
2902 [ + + ]: 344 : avopts->vacuum_cost_delay : -1;
6361 alvherre@alvh.no-ip. 2903 : 344 : tab->at_relname = NULL;
2904 : 344 : tab->at_nspname = NULL;
2905 : 344 : tab->at_datname = NULL;
2906 : :
2907 : : /*
2908 : : * If any of the cost delay parameters has been set individually for
2909 : : * this table, disable the balancing algorithm.
2910 : : */
4092 2911 : 344 : tab->at_dobalance =
2912 [ + + + - ]: 355 : !(avopts && (avopts->vacuum_cost_limit > 0 ||
966 dgustafsson@postgres 2913 [ + - ]: 11 : avopts->vacuum_cost_delay >= 0));
2914 : : }
2915 : :
207 tgl@sss.pgh.pa.us 2916 [ + + ]: 344 : if (free_avopts)
2917 : 11 : pfree(avopts);
6838 alvherre@alvh.no-ip. 2918 : 344 : heap_freetuple(classTup);
2919 : 344 : return tab;
2920 : : }
2921 : :
2922 : : /*
2923 : : * recheck_relation_needs_vacanalyze
2924 : : *
2925 : : * Subroutine for table_recheck_autovac.
2926 : : *
2927 : : * Fetch the pgstat of a relation and recheck whether a relation
2928 : : * needs to be vacuumed or analyzed.
2929 : : */
2930 : : static void
1834 fujii@postgresql.org 2931 : 344 : recheck_relation_needs_vacanalyze(Oid relid,
2932 : : AutoVacOpts *avopts,
2933 : : Form_pg_class classForm,
2934 : : int effective_multixact_freeze_max_age,
2935 : : bool *dovacuum,
2936 : : bool *doanalyze,
2937 : : bool *wraparound)
2938 : : {
2939 : : PgStat_StatTabEntry *tabentry;
2940 : :
2941 : : /* fetch the pgstat table entry */
1350 andres@anarazel.de 2942 : 344 : tabentry = pgstat_fetch_stat_tabentry_ext(classForm->relisshared,
2943 : : relid);
2944 : :
1834 fujii@postgresql.org 2945 : 344 : relation_needs_vacanalyze(relid, avopts, classForm, tabentry,
2946 : : effective_multixact_freeze_max_age,
2947 : : dovacuum, doanalyze, wraparound);
2948 : :
2949 : : /* Release tabentry to avoid leakage */
207 tgl@sss.pgh.pa.us 2950 [ + - ]: 344 : if (tabentry)
2951 : 344 : pfree(tabentry);
2952 : :
2953 : : /* ignore ANALYZE for toast tables */
1834 fujii@postgresql.org 2954 [ + + ]: 344 : if (classForm->relkind == RELKIND_TOASTVALUE)
2955 : 4 : *doanalyze = false;
2956 : 344 : }
2957 : :
2958 : : /*
2959 : : * relation_needs_vacanalyze
2960 : : *
2961 : : * Check whether a relation needs to be vacuumed or analyzed; return each into
2962 : : * "dovacuum" and "doanalyze", respectively. Also return whether the vacuum is
2963 : : * being forced because of Xid or multixact wraparound.
2964 : : *
2965 : : * relopts is a pointer to the AutoVacOpts options (either for itself in the
2966 : : * case of a plain table, or for either itself or its parent table in the case
2967 : : * of a TOAST table), NULL if none; tabentry is the pgstats entry, which can be
2968 : : * NULL.
2969 : : *
2970 : : * A table needs to be vacuumed if the number of dead tuples exceeds a
2971 : : * threshold. This threshold is calculated as
2972 : : *
2973 : : * threshold = vac_base_thresh + vac_scale_factor * reltuples
2974 : : * if (threshold > vac_max_thresh)
2975 : : * threshold = vac_max_thresh;
2976 : : *
2977 : : * For analyze, the analysis done is that the number of tuples inserted,
2978 : : * deleted and updated since the last analyze exceeds a threshold calculated
2979 : : * in the same fashion as above. Note that the cumulative stats system stores
2980 : : * the number of tuples (both live and dead) that there were as of the last
2981 : : * analyze. This is asymmetric to the VACUUM case.
2982 : : *
2983 : : * We also force vacuum if the table's relfrozenxid is more than freeze_max_age
2984 : : * transactions back, and if its relminmxid is more than
2985 : : * multixact_freeze_max_age multixacts back.
2986 : : *
2987 : : * A table whose autovacuum_enabled option is false is
2988 : : * automatically skipped (unless we have to vacuum it due to freeze_max_age).
2989 : : * Thus autovacuum can be disabled for specific tables. Also, when the cumulative
2990 : : * stats system does not have data about a table, it will be skipped.
2991 : : *
2992 : : * A table whose vac_base_thresh value is < 0 takes the base value from the
2993 : : * autovacuum_vacuum_threshold GUC variable. Similarly, a vac_scale_factor
2994 : : * value < 0 is substituted with the value of
2995 : : * autovacuum_vacuum_scale_factor GUC variable. Ditto for analyze.
2996 : : */
2997 : : static void
6838 alvherre@alvh.no-ip. 2998 : 7103 : relation_needs_vacanalyze(Oid relid,
2999 : : AutoVacOpts *relopts,
3000 : : Form_pg_class classForm,
3001 : : PgStat_StatTabEntry *tabentry,
3002 : : int effective_multixact_freeze_max_age,
3003 : : /* output params below */
3004 : : bool *dovacuum,
3005 : : bool *doanalyze,
3006 : : bool *wraparound)
3007 : : {
3008 : : bool force_vacuum;
3009 : : bool av_enabled;
3010 : :
3011 : : /* constants from reloptions or GUC variables */
3012 : : int vac_base_thresh,
3013 : : vac_max_thresh,
3014 : : vac_ins_base_thresh,
3015 : : anl_base_thresh;
3016 : : float4 vac_scale_factor,
3017 : : vac_ins_scale_factor,
3018 : : anl_scale_factor;
3019 : :
3020 : : /* thresholds calculated from above constants */
3021 : : float4 vacthresh,
3022 : : vacinsthresh,
3023 : : anlthresh;
3024 : :
3025 : : /* number of vacuum (resp. analyze) tuples at this time */
3026 : : float4 vactuples,
3027 : : instuples,
3028 : : anltuples;
3029 : :
3030 : : /* freeze parameters */
3031 : : int freeze_max_age;
3032 : : int multixact_freeze_max_age;
3033 : : TransactionId xidForceLimit;
3034 : : TransactionId relfrozenxid;
3035 : : MultiXactId multiForceLimit;
3036 : :
1145 peter@eisentraut.org 3037 [ - + ]: 7103 : Assert(classForm != NULL);
3038 [ - + ]: 7103 : Assert(OidIsValid(relid));
3039 : :
3040 : : /*
3041 : : * Determine vacuum/analyze equation parameters. We have two possible
3042 : : * sources: the passed reloptions (which could be a main table or a toast
3043 : : * table), or the autovacuum GUC variables.
3044 : : */
3045 : :
3046 : : /* -1 in autovac setting means use plain vacuum_scale_factor */
5955 alvherre@alvh.no-ip. 3047 [ - + ]: 146 : vac_scale_factor = (relopts && relopts->vacuum_scale_factor >= 0)
5955 alvherre@alvh.no-ip. 3048 :UBC 0 : ? relopts->vacuum_scale_factor
5955 alvherre@alvh.no-ip. 3049 [ + + ]:CBC 7249 : : autovacuum_vac_scale;
3050 : :
3051 [ - + ]: 146 : vac_base_thresh = (relopts && relopts->vacuum_threshold >= 0)
3052 : : ? relopts->vacuum_threshold
3053 [ + + ]: 7249 : : autovacuum_vac_thresh;
3054 : :
3055 : : /* -1 is used to disable max threshold */
314 nathan@postgresql.or 3056 [ - + ]: 146 : vac_max_thresh = (relopts && relopts->vacuum_max_threshold >= -1)
3057 : : ? relopts->vacuum_max_threshold
3058 [ + + ]: 7249 : : autovacuum_vac_max_thresh;
3059 : :
2089 drowley@postgresql.o 3060 [ - + ]: 146 : vac_ins_scale_factor = (relopts && relopts->vacuum_ins_scale_factor >= 0)
2089 drowley@postgresql.o 3061 :UBC 0 : ? relopts->vacuum_ins_scale_factor
2089 drowley@postgresql.o 3062 [ + + ]:CBC 7249 : : autovacuum_vac_ins_scale;
3063 : :
3064 : : /* -1 is used to disable insert vacuums */
3065 [ - + ]: 146 : vac_ins_base_thresh = (relopts && relopts->vacuum_ins_threshold >= -1)
3066 : : ? relopts->vacuum_ins_threshold
3067 [ + + ]: 7249 : : autovacuum_vac_ins_thresh;
3068 : :
5955 alvherre@alvh.no-ip. 3069 [ - + ]: 146 : anl_scale_factor = (relopts && relopts->analyze_scale_factor >= 0)
5955 alvherre@alvh.no-ip. 3070 :UBC 0 : ? relopts->analyze_scale_factor
5955 alvherre@alvh.no-ip. 3071 [ + + ]:CBC 7249 : : autovacuum_anl_scale;
3072 : :
3073 [ - + ]: 146 : anl_base_thresh = (relopts && relopts->analyze_threshold >= 0)
3074 : : ? relopts->analyze_threshold
3075 [ + + ]: 7249 : : autovacuum_anl_thresh;
3076 : :
3077 [ - + ]: 146 : freeze_max_age = (relopts && relopts->freeze_max_age >= 0)
5955 alvherre@alvh.no-ip. 3078 :UBC 0 : ? Min(relopts->freeze_max_age, autovacuum_freeze_max_age)
5955 alvherre@alvh.no-ip. 3079 [ + + ]:CBC 7249 : : autovacuum_freeze_max_age;
3080 : :
4324 3081 [ - + ]: 146 : multixact_freeze_max_age = (relopts && relopts->multixact_freeze_max_age >= 0)
3875 rhaas@postgresql.org 3082 :UBC 0 : ? Min(relopts->multixact_freeze_max_age, effective_multixact_freeze_max_age)
3875 rhaas@postgresql.org 3083 [ + + ]:CBC 7249 : : effective_multixact_freeze_max_age;
3084 : :
5955 alvherre@alvh.no-ip. 3085 [ + + + + ]: 7103 : av_enabled = (relopts ? relopts->enabled : true);
3086 : :
3087 : : /* Force vacuum if table is at risk of wraparound */
6981 tgl@sss.pgh.pa.us 3088 : 7103 : xidForceLimit = recentXid - freeze_max_age;
3089 [ - + ]: 7103 : if (xidForceLimit < FirstNormalTransactionId)
6981 tgl@sss.pgh.pa.us 3090 :UBC 0 : xidForceLimit -= FirstNormalTransactionId;
596 noah@leadboat.com 3091 :CBC 7103 : relfrozenxid = classForm->relfrozenxid;
3092 [ + - - + ]: 14206 : force_vacuum = (TransactionIdIsNormal(relfrozenxid) &&
3093 : 7103 : TransactionIdPrecedes(relfrozenxid, xidForceLimit));
4710 alvherre@alvh.no-ip. 3094 [ + - ]: 7103 : if (!force_vacuum)
3095 : : {
596 noah@leadboat.com 3096 : 7103 : MultiXactId relminmxid = classForm->relminmxid;
3097 : :
4324 alvherre@alvh.no-ip. 3098 : 7103 : multiForceLimit = recentMulti - multixact_freeze_max_age;
4710 3099 [ - + ]: 7103 : if (multiForceLimit < FirstMultiXactId)
4710 alvherre@alvh.no-ip. 3100 :UBC 0 : multiForceLimit -= FirstMultiXactId;
596 noah@leadboat.com 3101 [ + - - + ]:CBC 14206 : force_vacuum = MultiXactIdIsValid(relminmxid) &&
3102 : 7103 : MultiXactIdPrecedes(relminmxid, multiForceLimit);
3103 : : }
6628 alvherre@alvh.no-ip. 3104 : 7103 : *wraparound = force_vacuum;
3105 : :
3106 : : /* User disabled it in pg_class.reloptions? (But ignore if at risk) */
4157 tgl@sss.pgh.pa.us 3107 [ + + + - ]: 7103 : if (!av_enabled && !force_vacuum)
3108 : : {
6838 alvherre@alvh.no-ip. 3109 : 96 : *doanalyze = false;
3110 : 96 : *dovacuum = false;
6981 tgl@sss.pgh.pa.us 3111 : 96 : return;
3112 : : }
3113 : :
3114 : : /*
3115 : : * If we found stats for the table, and autovacuum is currently enabled,
3116 : : * make a threshold-based decision whether to vacuum and/or analyze. If
3117 : : * autovacuum is currently disabled, we must be here for anti-wraparound
3118 : : * vacuuming only, so don't vacuum (or analyze) anything that's not being
3119 : : * forced.
3120 : : */
83 peter@eisentraut.org 3121 [ + + + - ]:GNC 7007 : if (tabentry && AutoVacuumingActive())
6981 tgl@sss.pgh.pa.us 3122 :CBC 5270 : {
288 melanieplageman@gmai 3123 : 5270 : float4 pcnt_unfrozen = 1;
3124 : 5270 : float4 reltuples = classForm->reltuples;
3125 : 5270 : int32 relpages = classForm->relpages;
3126 : 5270 : int32 relallfrozen = classForm->relallfrozen;
3127 : :
1106 michael@paquier.xyz 3128 : 5270 : vactuples = tabentry->dead_tuples;
3129 : 5270 : instuples = tabentry->ins_since_vacuum;
3130 : 5270 : anltuples = tabentry->mod_since_analyze;
3131 : :
3132 : : /* If the table hasn't yet been vacuumed, take reltuples as zero */
1934 tgl@sss.pgh.pa.us 3133 [ + + ]: 5270 : if (reltuples < 0)
3134 : 1418 : reltuples = 0;
3135 : :
3136 : : /*
3137 : : * If we have data for relallfrozen, calculate the unfrozen percentage
3138 : : * of the table to modify insert scale factor. This helps us decide
3139 : : * whether or not to vacuum an insert-heavy table based on the number
3140 : : * of inserts to the more "active" part of the table.
3141 : : */
288 melanieplageman@gmai 3142 [ + + + + ]: 5270 : if (relpages > 0 && relallfrozen > 0)
3143 : : {
3144 : : /*
3145 : : * It could be the stats were updated manually and relallfrozen >
3146 : : * relpages. Clamp relallfrozen to relpages to avoid nonsensical
3147 : : * calculations.
3148 : : */
3149 : 1114 : relallfrozen = Min(relallfrozen, relpages);
3150 : 1114 : pcnt_unfrozen = 1 - ((float4) relallfrozen / relpages);
3151 : : }
3152 : :
6981 tgl@sss.pgh.pa.us 3153 : 5270 : vacthresh = (float4) vac_base_thresh + vac_scale_factor * reltuples;
314 nathan@postgresql.or 3154 [ + - - + ]: 5270 : if (vac_max_thresh >= 0 && vacthresh > (float4) vac_max_thresh)
314 nathan@postgresql.or 3155 :UBC 0 : vacthresh = (float4) vac_max_thresh;
3156 : :
288 melanieplageman@gmai 3157 :CBC 5270 : vacinsthresh = (float4) vac_ins_base_thresh +
3158 : 5270 : vac_ins_scale_factor * reltuples * pcnt_unfrozen;
6981 tgl@sss.pgh.pa.us 3159 : 5270 : anlthresh = (float4) anl_base_thresh + anl_scale_factor * reltuples;
3160 : :
2089 drowley@postgresql.o 3161 [ + - ]: 5270 : if (vac_ins_base_thresh >= 0)
3162 [ - + ]: 5270 : elog(DEBUG3, "%s: vac: %.0f (threshold %.0f), ins: %.0f (threshold %.0f), anl: %.0f (threshold %.0f)",
3163 : : NameStr(classForm->relname),
3164 : : vactuples, vacthresh, instuples, vacinsthresh, anltuples, anlthresh);
3165 : : else
2089 drowley@postgresql.o 3166 [ # # ]:UBC 0 : elog(DEBUG3, "%s: vac: %.0f (threshold %.0f), ins: (disabled), anl: %.0f (threshold %.0f)",
3167 : : NameStr(classForm->relname),
3168 : : vactuples, vacthresh, anltuples, anlthresh);
3169 : :
3170 : : /* Determine if this table needs vacuum or analyze. */
2089 drowley@postgresql.o 3171 [ + - + + :CBC 10286 : *dovacuum = force_vacuum || (vactuples > vacthresh) ||
+ - ]
2042 tgl@sss.pgh.pa.us 3172 [ + + ]: 5016 : (vac_ins_base_thresh >= 0 && instuples > vacinsthresh);
6838 alvherre@alvh.no-ip. 3173 : 5270 : *doanalyze = (anltuples > anlthresh);
3174 : : }
3175 : : else
3176 : : {
3177 : : /*
3178 : : * Skip a table not found in stat hash, unless we have to force vacuum
3179 : : * for anti-wrap purposes. If it's not acted upon, there's no need to
3180 : : * vacuum it.
3181 : : */
3182 : 1737 : *dovacuum = force_vacuum;
3183 : 1737 : *doanalyze = false;
3184 : : }
3185 : :
3186 : : /* ANALYZE refuses to work with pg_statistic */
7432 tgl@sss.pgh.pa.us 3187 [ + + ]: 7007 : if (relid == StatisticRelationId)
6838 alvherre@alvh.no-ip. 3188 : 39 : *doanalyze = false;
3189 : : }
3190 : :
3191 : : /*
3192 : : * autovacuum_do_vac_analyze
3193 : : * Vacuum and/or analyze the specified table
3194 : : *
3195 : : * We expect the caller to have switched into a memory context that won't
3196 : : * disappear at transaction commit.
3197 : : */
3198 : : static void
3926 3199 : 344 : autovacuum_do_vac_analyze(autovac_table *tab, BufferAccessStrategy bstrategy)
3200 : : {
3201 : : RangeVar *rangevar;
3202 : : VacuumRelation *rel;
3203 : : List *rel_list;
3204 : : MemoryContext vac_context;
3205 : : MemoryContext old_context;
3206 : :
3207 : : /* Let pgstat know what we're doing */
6361 3208 : 344 : autovac_report_activity(tab);
3209 : :
3210 : : /* Create a context that vacuum() can use as cross-transaction storage */
207 tgl@sss.pgh.pa.us 3211 : 344 : vac_context = AllocSetContextCreate(CurrentMemoryContext,
3212 : : "Vacuum",
3213 : : ALLOCSET_DEFAULT_SIZES);
3214 : :
3215 : : /* Set up one VacuumRelation target, identified by OID, for vacuum() */
3216 : 344 : old_context = MemoryContextSwitchTo(vac_context);
2996 3217 : 344 : rangevar = makeRangeVar(tab->at_nspname, tab->at_relname, -1);
3218 : 344 : rel = makeVacuumRelation(rangevar, tab->at_relid, NIL);
3219 : 344 : rel_list = list_make1(rel);
207 3220 : 344 : MemoryContextSwitchTo(old_context);
3221 : :
169 michael@paquier.xyz 3222 :GNC 344 : vacuum(rel_list, tab->at_params, bstrategy, vac_context, true);
3223 : :
985 drowley@postgresql.o 3224 :CBC 343 : MemoryContextDelete(vac_context);
7460 tgl@sss.pgh.pa.us 3225 : 343 : }
3226 : :
3227 : : /*
3228 : : * autovac_report_activity
3229 : : * Report to pgstat what autovacuum is doing
3230 : : *
3231 : : * We send a SQL string corresponding to what the user would see if the
3232 : : * equivalent command was to be issued manually.
3233 : : *
3234 : : * Note we assume that we are going to report the next command as soon as we're
3235 : : * done with the current one, and exit right after the last one, so we don't
3236 : : * bother to report "<IDLE>" or some such.
3237 : : */
3238 : : static void
6361 alvherre@alvh.no-ip. 3239 : 344 : autovac_report_activity(autovac_table *tab)
3240 : : {
3241 : : #define MAX_AUTOVAC_ACTIV_LEN (NAMEDATALEN * 2 + 56)
3242 : : char activity[MAX_AUTOVAC_ACTIV_LEN];
3243 : : int len;
3244 : :
3245 : : /* Report the command and possible options */
2465 rhaas@postgresql.org 3246 [ + + ]: 344 : if (tab->at_params.options & VACOPT_VACUUM)
7151 alvherre@alvh.no-ip. 3247 : 176 : snprintf(activity, MAX_AUTOVAC_ACTIV_LEN,
3248 : : "autovacuum: VACUUM%s",
2465 rhaas@postgresql.org 3249 [ + + ]: 176 : tab->at_params.options & VACOPT_ANALYZE ? " ANALYZE" : "");
3250 : : else
7151 alvherre@alvh.no-ip. 3251 : 168 : snprintf(activity, MAX_AUTOVAC_ACTIV_LEN,
3252 : : "autovacuum: ANALYZE");
3253 : :
3254 : : /*
3255 : : * Report the qualified name of the relation.
3256 : : */
6361 3257 : 344 : len = strlen(activity);
3258 : :
3259 : 344 : snprintf(activity + len, MAX_AUTOVAC_ACTIV_LEN - len,
3260 : : " %s.%s%s", tab->at_nspname, tab->at_relname,
3926 3261 [ - + ]: 344 : tab->at_params.is_wraparound ? " (to prevent wraparound)" : "");
3262 : :
3263 : : /* Set statement_timestamp() to current time for pg_stat_activity */
6659 tgl@sss.pgh.pa.us 3264 : 344 : SetCurrentStatementStartTimestamp();
3265 : :
5080 magnus@hagander.net 3266 : 344 : pgstat_report_activity(STATE_RUNNING, activity);
7151 alvherre@alvh.no-ip. 3267 : 344 : }
3268 : :
3269 : : /*
3270 : : * autovac_report_workitem
3271 : : * Report to pgstat that autovacuum is processing a work item
3272 : : */
3273 : : static void
3181 3274 : 6 : autovac_report_workitem(AutoVacuumWorkItem *workitem,
3275 : : const char *nspname, const char *relname)
3276 : : {
3277 : : char activity[MAX_AUTOVAC_ACTIV_LEN + 12 + 2];
3278 : : char blk[12 + 2];
3279 : : int len;
3280 : :
3281 [ + - ]: 6 : switch (workitem->avw_type)
3282 : : {
3283 : 6 : case AVW_BRINSummarizeRange:
3284 : 6 : snprintf(activity, MAX_AUTOVAC_ACTIV_LEN,
3285 : : "autovacuum: BRIN summarize");
3286 : 6 : break;
3287 : : }
3288 : :
3289 : : /*
3290 : : * Report the qualified name of the relation, and the block number if any
3291 : : */
3292 : 6 : len = strlen(activity);
3293 : :
3294 [ + - ]: 6 : if (BlockNumberIsValid(workitem->avw_blockNumber))
3295 : 6 : snprintf(blk, sizeof(blk), " %u", workitem->avw_blockNumber);
3296 : : else
3181 alvherre@alvh.no-ip. 3297 :UBC 0 : blk[0] = '\0';
3298 : :
3181 alvherre@alvh.no-ip. 3299 :CBC 6 : snprintf(activity + len, MAX_AUTOVAC_ACTIV_LEN - len,
3300 : : " %s.%s%s", nspname, relname, blk);
3301 : :
3302 : : /* Set statement_timestamp() to current time for pg_stat_activity */
3303 : 6 : SetCurrentStatementStartTimestamp();
3304 : :
3305 : 6 : pgstat_report_activity(STATE_RUNNING, activity);
3306 : 6 : }
3307 : :
3308 : : /*
3309 : : * AutoVacuumingActive
3310 : : * Check GUC vars and report whether the autovacuum process should be
3311 : : * running.
3312 : : */
3313 : : bool
7460 tgl@sss.pgh.pa.us 3314 : 42273 : AutoVacuumingActive(void)
3315 : : {
6658 3316 [ + + - + ]: 42273 : if (!autovacuum_start_daemon || !pgstat_track_counts)
7460 3317 : 4148 : return false;
3318 : 38125 : return true;
3319 : : }
3320 : :
3321 : : /*
3322 : : * Request one work item to the next autovacuum run processing our database.
3323 : : * Return false if the request can't be recorded.
3324 : : */
3325 : : bool
3181 alvherre@alvh.no-ip. 3326 : 6 : AutoVacuumRequestWork(AutoVacuumWorkItemType type, Oid relationId,
3327 : : BlockNumber blkno)
3328 : : {
3329 : : int i;
2834 3330 : 6 : bool result = false;
3331 : :
3181 3332 : 6 : LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
3333 : :
3334 : : /*
3335 : : * Locate an unused work item and fill it with the given data.
3336 : : */
3045 3337 [ + - ]: 21 : for (i = 0; i < NUM_WORKITEMS; i++)
3338 : : {
3339 : 21 : AutoVacuumWorkItem *workitem = &AutoVacuumShmem->av_workItems[i];
3340 : :
3341 [ + + ]: 21 : if (workitem->avw_used)
3342 : 15 : continue;
3343 : :
3344 : 6 : workitem->avw_used = true;
3345 : 6 : workitem->avw_active = false;
3346 : 6 : workitem->avw_type = type;
3347 : 6 : workitem->avw_database = MyDatabaseId;
3348 : 6 : workitem->avw_relation = relationId;
3349 : 6 : workitem->avw_blockNumber = blkno;
2834 3350 : 6 : result = true;
3351 : :
3352 : : /* done */
3045 3353 : 6 : break;
3354 : : }
3355 : :
3181 3356 : 6 : LWLockRelease(AutovacuumLock);
3357 : :
2834 3358 : 6 : return result;
3359 : : }
3360 : :
3361 : : /*
3362 : : * autovac_init
3363 : : * This is called at postmaster initialization.
3364 : : *
3365 : : * All we do here is annoy the user if he got it wrong.
3366 : : */
3367 : : void
7460 tgl@sss.pgh.pa.us 3368 : 842 : autovac_init(void)
3369 : : {
344 nathan@postgresql.or 3370 [ + + ]: 842 : if (!autovacuum_start_daemon)
3371 : 112 : return;
3372 [ - + ]: 730 : else if (!pgstat_track_counts)
7460 tgl@sss.pgh.pa.us 3373 [ # # ]:UBC 0 : ereport(WARNING,
3374 : : (errmsg("autovacuum not started because of misconfiguration"),
3375 : : errhint("Enable the \"track_counts\" option.")));
3376 : : else
344 nathan@postgresql.or 3377 :CBC 730 : check_av_worker_gucs();
3378 : : }
3379 : :
3380 : : /*
3381 : : * AutoVacuumShmemSize
3382 : : * Compute space needed for autovacuum-related shared memory
3383 : : */
3384 : : Size
6879 alvherre@alvh.no-ip. 3385 : 3055 : AutoVacuumShmemSize(void)
3386 : : {
3387 : : Size size;
3388 : :
3389 : : /*
3390 : : * Need the fixed struct and the array of WorkerInfoData.
3391 : : */
6819 3392 : 3055 : size = sizeof(AutoVacuumShmemStruct);
3393 : 3055 : size = MAXALIGN(size);
344 nathan@postgresql.or 3394 : 3055 : size = add_size(size, mul_size(autovacuum_worker_slots,
3395 : : sizeof(WorkerInfoData)));
6819 alvherre@alvh.no-ip. 3396 : 3055 : return size;
3397 : : }
3398 : :
3399 : : /*
3400 : : * AutoVacuumShmemInit
3401 : : * Allocate and initialize autovacuum-related shared memory
3402 : : */
3403 : : void
6879 3404 : 1069 : AutoVacuumShmemInit(void)
3405 : : {
3406 : : bool found;
3407 : :
3408 : 1069 : AutoVacuumShmem = (AutoVacuumShmemStruct *)
3409 : 1069 : ShmemInitStruct("AutoVacuum Data",
3410 : : AutoVacuumShmemSize(),
3411 : : &found);
3412 : :
6819 3413 [ + - ]: 1069 : if (!IsUnderPostmaster)
3414 : : {
3415 : : WorkerInfo worker;
3416 : : int i;
3417 : :
3418 [ - + ]: 1069 : Assert(!found);
3419 : :
3420 : 1069 : AutoVacuumShmem->av_launcherpid = 0;
344 nathan@postgresql.or 3421 : 1069 : dclist_init(&AutoVacuumShmem->av_freeWorkers);
4809 alvherre@alvh.no-ip. 3422 : 1069 : dlist_init(&AutoVacuumShmem->av_runningWorkers);
6253 tgl@sss.pgh.pa.us 3423 : 1069 : AutoVacuumShmem->av_startingWorker = NULL;
3045 alvherre@alvh.no-ip. 3424 : 1069 : memset(AutoVacuumShmem->av_workItems, 0,
3425 : : sizeof(AutoVacuumWorkItem) * NUM_WORKITEMS);
3426 : :
6819 3427 : 1069 : worker = (WorkerInfo) ((char *) AutoVacuumShmem +
3428 : : MAXALIGN(sizeof(AutoVacuumShmemStruct)));
3429 : :
3430 : : /* initialize the WorkerInfo free list */
344 nathan@postgresql.or 3431 [ + + ]: 12791 : for (i = 0; i < autovacuum_worker_slots; i++)
3432 : : {
3433 : 11722 : dclist_push_head(&AutoVacuumShmem->av_freeWorkers,
3434 : 11722 : &worker[i].wi_links);
984 dgustafsson@postgres 3435 : 11722 : pg_atomic_init_flag(&worker[i].wi_dobalance);
3436 : : }
3437 : :
3438 : 1069 : pg_atomic_init_u32(&AutoVacuumShmem->av_nworkersForBalance, 0);
3439 : :
3440 : : }
3441 : : else
6819 alvherre@alvh.no-ip. 3442 [ # # ]:UBC 0 : Assert(found);
7460 tgl@sss.pgh.pa.us 3443 :CBC 1069 : }
3444 : :
3445 : : /*
3446 : : * GUC check_hook for autovacuum_work_mem
3447 : : */
3448 : : bool
1190 3449 : 1109 : check_autovacuum_work_mem(int *newval, void **extra, GucSource source)
3450 : : {
3451 : : /*
3452 : : * -1 indicates fallback.
3453 : : *
3454 : : * If we haven't yet changed the boot_val default of -1, just let it be.
3455 : : * Autovacuum will look to maintenance_work_mem instead.
3456 : : */
3457 [ + + ]: 1109 : if (*newval == -1)
3458 : 1107 : return true;
3459 : :
3460 : : /*
3461 : : * We clamp manually-set values to at least 64kB. Since
3462 : : * maintenance_work_mem is always set to at least this value, do the same
3463 : : * here.
3464 : : */
497 john.naylor@postgres 3465 [ + - ]: 2 : if (*newval < 64)
3466 : 2 : *newval = 64;
3467 : :
1190 tgl@sss.pgh.pa.us 3468 : 2 : return true;
3469 : : }
3470 : :
3471 : : /*
3472 : : * Returns whether there is a free autovacuum worker slot available.
3473 : : */
3474 : : static bool
344 nathan@postgresql.or 3475 : 3070 : av_worker_available(void)
3476 : : {
3477 : : int free_slots;
3478 : : int reserved_slots;
3479 : :
3480 : 3070 : free_slots = dclist_count(&AutoVacuumShmem->av_freeWorkers);
3481 : :
3482 : 3070 : reserved_slots = autovacuum_worker_slots - autovacuum_max_workers;
3483 : 3070 : reserved_slots = Max(0, reserved_slots);
3484 : :
3485 : 3070 : return free_slots > reserved_slots;
3486 : : }
3487 : :
3488 : : /*
3489 : : * Emits a WARNING if autovacuum_worker_slots < autovacuum_max_workers.
3490 : : */
3491 : : static void
3492 : 730 : check_av_worker_gucs(void)
3493 : : {
3494 [ - + ]: 730 : if (autovacuum_worker_slots < autovacuum_max_workers)
344 nathan@postgresql.or 3495 [ # # ]:UBC 0 : ereport(WARNING,
3496 : : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3497 : : errmsg("\"autovacuum_max_workers\" (%d) should be less than or equal to \"autovacuum_worker_slots\" (%d)",
3498 : : autovacuum_max_workers, autovacuum_worker_slots),
3499 : : errdetail("The server will only start up to \"autovacuum_worker_slots\" (%d) autovacuum workers at a given time.",
3500 : : autovacuum_worker_slots)));
344 nathan@postgresql.or 3501 :CBC 730 : }
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