PostgreSQL Source Code  git master
commit_ts.h File Reference
#include "access/xlog.h"
#include "datatype/timestamp.h"
#include "replication/origin.h"
#include "storage/sync.h"
#include "utils/guc.h"
Include dependency graph for commit_ts.h:
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Data Structures

struct  xl_commit_ts_set
 
struct  xl_commit_ts_truncate
 

Macros

#define COMMIT_TS_ZEROPAGE   0x00
 
#define COMMIT_TS_TRUNCATE   0x10
 
#define COMMIT_TS_SETTS   0x20
 
#define SizeOfCommitTsSet
 
#define SizeOfCommitTsTruncate
 

Typedefs

typedef struct xl_commit_ts_set xl_commit_ts_set
 
typedef struct xl_commit_ts_truncate xl_commit_ts_truncate
 

Functions

bool check_track_commit_timestamp (bool *newval, void **extra, GucSource source)
 
void TransactionTreeSetCommitTsData (TransactionId xid, int nsubxids, TransactionId *subxids, TimestampTz timestamp, RepOriginId nodeid, bool write_xlog)
 
bool TransactionIdGetCommitTsData (TransactionId xid, TimestampTz *ts, RepOriginId *nodeid)
 
TransactionId GetLatestCommitTsData (TimestampTz *ts, RepOriginId *nodeid)
 
Size CommitTsShmemBuffers (void)
 
Size CommitTsShmemSize (void)
 
void CommitTsShmemInit (void)
 
void BootStrapCommitTs (void)
 
void StartupCommitTs (void)
 
void CommitTsParameterChange (bool newvalue, bool oldvalue)
 
void CompleteCommitTsInitialization (void)
 
void ShutdownCommitTs (void)
 
void CheckPointCommitTs (void)
 
void ExtendCommitTs (TransactionId newestXact)
 
void TruncateCommitTs (TransactionId oldestXact)
 
void SetCommitTsLimit (TransactionId oldestXact, TransactionId newestXact)
 
void AdvanceOldestCommitTsXid (TransactionId oldestXact)
 
int committssyncfiletag (const FileTag *ftag, char *path)
 
void commit_ts_redo (XLogReaderState *record)
 
void commit_ts_desc (StringInfo buf, XLogReaderState *record)
 
const char * commit_ts_identify (uint8 info)
 

Variables

PGDLLIMPORT bool track_commit_timestamp
 

Macro Definition Documentation

◆ COMMIT_TS_SETTS

#define COMMIT_TS_SETTS   0x20

◆ COMMIT_TS_TRUNCATE

#define COMMIT_TS_TRUNCATE   0x10

◆ COMMIT_TS_ZEROPAGE

#define COMMIT_TS_ZEROPAGE   0x00

◆ SizeOfCommitTsSet

#define SizeOfCommitTsSet
Value:
(offsetof(xl_commit_ts_set, mainxid) + \
sizeof(TransactionId))
uint32 TransactionId
Definition: c.h:521
#define offsetof(type, field)
Definition: c.h:669

Definition at line 64 of file commit_ts.h.

Referenced by commit_ts_desc(), and commit_ts_redo().

◆ SizeOfCommitTsTruncate

#define SizeOfCommitTsTruncate
Value:
sizeof(TransactionId))
uint32 TransactionId
Definition: c.h:521
#define offsetof(type, field)
Definition: c.h:669

Definition at line 73 of file commit_ts.h.

Referenced by WriteTruncateXlogRec().

Typedef Documentation

◆ xl_commit_ts_set

◆ xl_commit_ts_truncate

Function Documentation

◆ AdvanceOldestCommitTsXid()

void AdvanceOldestCommitTsXid ( TransactionId  oldestXact)

Definition at line 919 of file commit_ts.c.

References InvalidTransactionId, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), VariableCacheData::oldestCommitTsXid, ShmemVariableCache, and TransactionIdPrecedes().

Referenced by commit_ts_redo(), and vac_truncate_clog().

920 {
921  LWLockAcquire(CommitTsLock, LW_EXCLUSIVE);
925  LWLockRelease(CommitTsLock);
926 }
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
VariableCache ShmemVariableCache
Definition: varsup.c:34
#define InvalidTransactionId
Definition: transam.h:31
TransactionId oldestCommitTsXid
Definition: transam.h:225
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:300
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208

◆ BootStrapCommitTs()

void BootStrapCommitTs ( void  )

Definition at line 585 of file commit_ts.c.

Referenced by BootStrapXLOG().

586 {
587  /*
588  * Nothing to do here at present, unlike most other SLRU modules; segments
589  * are created when the server is started with this module enabled. See
590  * ActivateCommitTs.
591  */
592 }

◆ check_track_commit_timestamp()

bool check_track_commit_timestamp ( bool newval,
void **  extra,
GucSource  source 
)

◆ CheckPointCommitTs()

void CheckPointCommitTs ( void  )

Definition at line 806 of file commit_ts.c.

References CommitTsCtl, and SimpleLruWriteAll().

Referenced by CheckPointGuts().

807 {
808  /*
809  * Write dirty CommitTs pages to disk. This may result in sync requests
810  * queued for later handling by ProcessSyncRequests(), as part of the
811  * checkpoint.
812  */
814 }
#define CommitTsCtl
Definition: commit_ts.c:79
void SimpleLruWriteAll(SlruCtl ctl, bool allow_redirtied)
Definition: slru.c:1155

◆ commit_ts_desc()

void commit_ts_desc ( StringInfo  buf,
XLogReaderState record 
)

Definition at line 22 of file committsdesc.c.

References appendStringInfo(), COMMIT_TS_SETTS, COMMIT_TS_TRUNCATE, COMMIT_TS_ZEROPAGE, i, xl_commit_ts_set::mainxid, xl_commit_ts_set::nodeid, xl_commit_ts_truncate::oldestXid, xl_commit_ts_truncate::pageno, palloc(), pfree(), SizeOfCommitTsSet, xl_commit_ts_set::timestamp, timestamptz_to_str(), XLogRecGetData, XLogRecGetDataLen, XLogRecGetInfo, and XLR_INFO_MASK.

23 {
24  char *rec = XLogRecGetData(record);
25  uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
26 
27  if (info == COMMIT_TS_ZEROPAGE)
28  {
29  int pageno;
30 
31  memcpy(&pageno, rec, sizeof(int));
32  appendStringInfo(buf, "%d", pageno);
33  }
34  else if (info == COMMIT_TS_TRUNCATE)
35  {
37 
38  appendStringInfo(buf, "pageno %d, oldestXid %u",
39  trunc->pageno, trunc->oldestXid);
40  }
41  else if (info == COMMIT_TS_SETTS)
42  {
43  xl_commit_ts_set *xlrec = (xl_commit_ts_set *) rec;
44  int nsubxids;
45 
46  appendStringInfo(buf, "set %s/%d for: %u",
48  xlrec->nodeid,
49  xlrec->mainxid);
50  nsubxids = ((XLogRecGetDataLen(record) - SizeOfCommitTsSet) /
51  sizeof(TransactionId));
52  if (nsubxids > 0)
53  {
54  int i;
55  TransactionId *subxids;
56 
57  subxids = palloc(sizeof(TransactionId) * nsubxids);
58  memcpy(subxids,
60  sizeof(TransactionId) * nsubxids);
61  for (i = 0; i < nsubxids; i++)
62  appendStringInfo(buf, ", %u", subxids[i]);
63  pfree(subxids);
64  }
65  }
66 }
#define COMMIT_TS_ZEROPAGE
Definition: commit_ts.h:52
#define COMMIT_TS_SETTS
Definition: commit_ts.h:54
uint32 TransactionId
Definition: c.h:521
unsigned char uint8
Definition: c.h:373
TimestampTz timestamp
Definition: commit_ts.h:58
void pfree(void *pointer)
Definition: mcxt.c:1057
#define XLogRecGetData(decoder)
Definition: xlogreader.h:310
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:91
#define XLogRecGetDataLen(decoder)
Definition: xlogreader.h:311
#define SizeOfCommitTsSet
Definition: commit_ts.h:64
TransactionId oldestXid
Definition: commit_ts.h:70
#define XLogRecGetInfo(decoder)
Definition: xlogreader.h:305
#define COMMIT_TS_TRUNCATE
Definition: commit_ts.h:53
TransactionId mainxid
Definition: commit_ts.h:60
#define XLR_INFO_MASK
Definition: xlogrecord.h:62
void * palloc(Size size)
Definition: mcxt.c:950
RepOriginId nodeid
Definition: commit_ts.h:59
int i
const char * timestamptz_to_str(TimestampTz t)
Definition: timestamp.c:1740

◆ commit_ts_identify()

const char* commit_ts_identify ( uint8  info)

Definition at line 69 of file committsdesc.c.

References COMMIT_TS_SETTS, COMMIT_TS_TRUNCATE, and COMMIT_TS_ZEROPAGE.

70 {
71  switch (info)
72  {
73  case COMMIT_TS_ZEROPAGE:
74  return "ZEROPAGE";
75  case COMMIT_TS_TRUNCATE:
76  return "TRUNCATE";
77  case COMMIT_TS_SETTS:
78  return "SETTS";
79  default:
80  return NULL;
81  }
82 }
#define COMMIT_TS_ZEROPAGE
Definition: commit_ts.h:52
#define COMMIT_TS_SETTS
Definition: commit_ts.h:54
#define COMMIT_TS_TRUNCATE
Definition: commit_ts.h:53

◆ commit_ts_redo()

void commit_ts_redo ( XLogReaderState record)

Definition at line 1007 of file commit_ts.c.

References AdvanceOldestCommitTsXid(), Assert, COMMIT_TS_SETTS, COMMIT_TS_TRUNCATE, COMMIT_TS_ZEROPAGE, CommitTsCtl, elog, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), xl_commit_ts_set::mainxid, xl_commit_ts_set::nodeid, xl_commit_ts_truncate::oldestXid, xl_commit_ts_truncate::pageno, palloc(), PANIC, pfree(), SimpleLruTruncate(), SimpleLruWritePage(), SizeOfCommitTsSet, xl_commit_ts_set::timestamp, TransactionTreeSetCommitTsData(), XLogRecGetData, XLogRecGetDataLen, XLogRecGetInfo, XLogRecHasAnyBlockRefs, XLR_INFO_MASK, and ZeroCommitTsPage().

1008 {
1009  uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
1010 
1011  /* Backup blocks are not used in commit_ts records */
1012  Assert(!XLogRecHasAnyBlockRefs(record));
1013 
1014  if (info == COMMIT_TS_ZEROPAGE)
1015  {
1016  int pageno;
1017  int slotno;
1018 
1019  memcpy(&pageno, XLogRecGetData(record), sizeof(int));
1020 
1021  LWLockAcquire(CommitTsSLRULock, LW_EXCLUSIVE);
1022 
1023  slotno = ZeroCommitTsPage(pageno, false);
1025  Assert(!CommitTsCtl->shared->page_dirty[slotno]);
1026 
1027  LWLockRelease(CommitTsSLRULock);
1028  }
1029  else if (info == COMMIT_TS_TRUNCATE)
1030  {
1032 
1034 
1035  /*
1036  * During XLOG replay, latest_page_number isn't set up yet; insert a
1037  * suitable value to bypass the sanity test in SimpleLruTruncate.
1038  */
1039  CommitTsCtl->shared->latest_page_number = trunc->pageno;
1040 
1042  }
1043  else if (info == COMMIT_TS_SETTS)
1044  {
1045  xl_commit_ts_set *setts = (xl_commit_ts_set *) XLogRecGetData(record);
1046  int nsubxids;
1047  TransactionId *subxids;
1048 
1049  nsubxids = ((XLogRecGetDataLen(record) - SizeOfCommitTsSet) /
1050  sizeof(TransactionId));
1051  if (nsubxids > 0)
1052  {
1053  subxids = palloc(sizeof(TransactionId) * nsubxids);
1054  memcpy(subxids,
1056  sizeof(TransactionId) * nsubxids);
1057  }
1058  else
1059  subxids = NULL;
1060 
1061  TransactionTreeSetCommitTsData(setts->mainxid, nsubxids, subxids,
1062  setts->timestamp, setts->nodeid, true);
1063  if (subxids)
1064  pfree(subxids);
1065  }
1066  else
1067  elog(PANIC, "commit_ts_redo: unknown op code %u", info);
1068 }
#define COMMIT_TS_ZEROPAGE
Definition: commit_ts.h:52
#define COMMIT_TS_SETTS
Definition: commit_ts.h:54
uint32 TransactionId
Definition: c.h:521
#define CommitTsCtl
Definition: commit_ts.c:79
static int ZeroCommitTsPage(int pageno, bool writeXlog)
Definition: commit_ts.c:604
void SimpleLruTruncate(SlruCtl ctl, int cutoffPage)
Definition: slru.c:1225
unsigned char uint8
Definition: c.h:373
#define PANIC
Definition: elog.h:53
void AdvanceOldestCommitTsXid(TransactionId oldestXact)
Definition: commit_ts.c:919
TimestampTz timestamp
Definition: commit_ts.h:58
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
void pfree(void *pointer)
Definition: mcxt.c:1057
#define XLogRecGetData(decoder)
Definition: xlogreader.h:310
#define XLogRecGetDataLen(decoder)
Definition: xlogreader.h:311
#define SizeOfCommitTsSet
Definition: commit_ts.h:64
TransactionId oldestXid
Definition: commit_ts.h:70
void SimpleLruWritePage(SlruCtl ctl, int slotno)
Definition: slru.c:613
#define XLogRecGetInfo(decoder)
Definition: xlogreader.h:305
#define COMMIT_TS_TRUNCATE
Definition: commit_ts.h:53
TransactionId mainxid
Definition: commit_ts.h:60
#define Assert(condition)
Definition: c.h:746
#define XLR_INFO_MASK
Definition: xlogrecord.h:62
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208
void * palloc(Size size)
Definition: mcxt.c:950
RepOriginId nodeid
Definition: commit_ts.h:59
#define elog(elevel,...)
Definition: elog.h:214
#define XLogRecHasAnyBlockRefs(decoder)
Definition: xlogreader.h:312
void TransactionTreeSetCommitTsData(TransactionId xid, int nsubxids, TransactionId *subxids, TimestampTz timestamp, RepOriginId nodeid, bool write_xlog)
Definition: commit_ts.c:145

◆ CommitTsParameterChange()

void CommitTsParameterChange ( bool  newvalue,
bool  oldvalue 
)

Definition at line 653 of file commit_ts.c.

References ActivateCommitTs(), CommitTimestampShared::commitTsActive, and DeactivateCommitTs().

Referenced by xlog_redo().

654 {
655  /*
656  * If the commit_ts module is disabled in this server and we get word from
657  * the primary server that it is enabled there, activate it so that we can
658  * replay future WAL records involving it; also mark it as active on
659  * pg_control. If the old value was already set, we already did this, so
660  * don't do anything.
661  *
662  * If the module is disabled in the primary, disable it here too, unless
663  * the module is enabled locally.
664  *
665  * Note this only runs in the recovery process, so an unlocked read is
666  * fine.
667  */
668  if (newvalue)
669  {
672  }
673  else if (commitTsShared->commitTsActive)
675 }
static void ActivateCommitTs(void)
Definition: commit_ts.c:694
static void DeactivateCommitTs(void)
Definition: commit_ts.c:768
CommitTimestampShared * commitTsShared
Definition: commit_ts.c:99

◆ CommitTsShmemBuffers()

Size CommitTsShmemBuffers ( void  )

Definition at line 531 of file commit_ts.c.

References Max, Min, and NBuffers.

Referenced by CommitTsShmemInit(), and CommitTsShmemSize().

532 {
533  return Min(16, Max(4, NBuffers / 1024));
534 }
#define Min(x, y)
Definition: c.h:928
#define Max(x, y)
Definition: c.h:922
int NBuffers
Definition: globals.c:132

◆ CommitTsShmemInit()

void CommitTsShmemInit ( void  )

Definition at line 551 of file commit_ts.c.

References Assert, CommitTimestampShared::commitTsActive, CommitTsCtl, CommitTsPagePrecedes(), CommitTsShmemBuffers(), CommitTimestampShared::dataLastCommit, InvalidRepOriginId, InvalidTransactionId, IsUnderPostmaster, LWTRANCHE_COMMITTS_BUFFER, CommitTimestampEntry::nodeid, ShmemInitStruct(), SimpleLruInit(), SYNC_HANDLER_COMMIT_TS, CommitTimestampEntry::time, TIMESTAMP_NOBEGIN, and CommitTimestampShared::xidLastCommit.

Referenced by CreateSharedMemoryAndSemaphores().

552 {
553  bool found;
554 
555  CommitTsCtl->PagePrecedes = CommitTsPagePrecedes;
557  CommitTsSLRULock, "pg_commit_ts",
560 
561  commitTsShared = ShmemInitStruct("CommitTs shared",
562  sizeof(CommitTimestampShared),
563  &found);
564 
565  if (!IsUnderPostmaster)
566  {
567  Assert(!found);
568 
573  }
574  else
575  Assert(found);
576 }
CommitTimestampEntry dataLastCommit
Definition: commit_ts.c:95
#define CommitTsCtl
Definition: commit_ts.c:79
Size CommitTsShmemBuffers(void)
Definition: commit_ts.c:531
void SimpleLruInit(SlruCtl ctl, const char *name, int nslots, int nlsns, LWLock *ctllock, const char *subdir, int tranche_id, SyncRequestHandler sync_handler)
Definition: slru.c:186
void * ShmemInitStruct(const char *name, Size size, bool *foundPtr)
Definition: shmem.c:392
bool IsUnderPostmaster
Definition: globals.c:109
#define InvalidTransactionId
Definition: transam.h:31
#define TIMESTAMP_NOBEGIN(j)
Definition: timestamp.h:112
TimestampTz time
Definition: commit_ts.c:59
static bool CommitTsPagePrecedes(int page1, int page2)
Definition: commit_ts.c:940
TransactionId xidLastCommit
Definition: commit_ts.c:94
#define Assert(condition)
Definition: c.h:746
#define InvalidRepOriginId
Definition: origin.h:33
RepOriginId nodeid
Definition: commit_ts.c:60
CommitTimestampShared * commitTsShared
Definition: commit_ts.c:99

◆ CommitTsShmemSize()

Size CommitTsShmemSize ( void  )

Definition at line 540 of file commit_ts.c.

References CommitTsShmemBuffers(), and SimpleLruShmemSize().

Referenced by CreateSharedMemoryAndSemaphores().

541 {
543  sizeof(CommitTimestampShared);
544 }
Size SimpleLruShmemSize(int nslots, int nlsns)
Definition: slru.c:155
Size CommitTsShmemBuffers(void)
Definition: commit_ts.c:531
struct CommitTimestampShared CommitTimestampShared

◆ committssyncfiletag()

int committssyncfiletag ( const FileTag ftag,
char *  path 
)

Definition at line 1074 of file commit_ts.c.

References CommitTsCtl, and SlruSyncFileTag().

1075 {
1076  return SlruSyncFileTag(CommitTsCtl, ftag, path);
1077 }
int SlruSyncFileTag(SlruCtl ctl, const FileTag *ftag, char *path)
Definition: slru.c:1489
#define CommitTsCtl
Definition: commit_ts.c:79

◆ CompleteCommitTsInitialization()

void CompleteCommitTsInitialization ( void  )

Definition at line 631 of file commit_ts.c.

References ActivateCommitTs(), DeactivateCommitTs(), and track_commit_timestamp.

Referenced by StartupXLOG().

632 {
633  /*
634  * If the feature is not enabled, turn it off for good. This also removes
635  * any leftover data.
636  *
637  * Conversely, we activate the module if the feature is enabled. This is
638  * necessary for primary and standby as the activation depends on the
639  * control file contents at the beginning of recovery or when a
640  * XLOG_PARAMETER_CHANGE is replayed.
641  */
644  else
646 }
bool track_commit_timestamp
Definition: commit_ts.c:103
static void ActivateCommitTs(void)
Definition: commit_ts.c:694
static void DeactivateCommitTs(void)
Definition: commit_ts.c:768

◆ ExtendCommitTs()

void ExtendCommitTs ( TransactionId  newestXact)

Definition at line 828 of file commit_ts.c.

References Assert, CommitTimestampShared::commitTsActive, FirstNormalTransactionId, InRecovery, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), TransactionIdEquals, TransactionIdToCTsEntry, TransactionIdToCTsPage, and ZeroCommitTsPage().

Referenced by GetNewTransactionId().

829 {
830  int pageno;
831 
832  /*
833  * Nothing to do if module not enabled. Note we do an unlocked read of
834  * the flag here, which is okay because this routine is only called from
835  * GetNewTransactionId, which is never called in a standby.
836  */
837  Assert(!InRecovery);
839  return;
840 
841  /*
842  * No work except at first XID of a page. But beware: just after
843  * wraparound, the first XID of page zero is FirstNormalTransactionId.
844  */
845  if (TransactionIdToCTsEntry(newestXact) != 0 &&
847  return;
848 
849  pageno = TransactionIdToCTsPage(newestXact);
850 
851  LWLockAcquire(CommitTsSLRULock, LW_EXCLUSIVE);
852 
853  /* Zero the page and make an XLOG entry about it */
854  ZeroCommitTsPage(pageno, !InRecovery);
855 
856  LWLockRelease(CommitTsSLRULock);
857 }
#define TransactionIdEquals(id1, id2)
Definition: transam.h:43
static int ZeroCommitTsPage(int pageno, bool writeXlog)
Definition: commit_ts.c:604
bool InRecovery
Definition: xlog.c:205
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
#define FirstNormalTransactionId
Definition: transam.h:34
#define TransactionIdToCTsPage(xid)
Definition: commit_ts.c:69
#define Assert(condition)
Definition: c.h:746
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208
#define TransactionIdToCTsEntry(xid)
Definition: commit_ts.c:71
CommitTimestampShared * commitTsShared
Definition: commit_ts.c:99

◆ GetLatestCommitTsData()

TransactionId GetLatestCommitTsData ( TimestampTz ts,
RepOriginId nodeid 
)

Definition at line 368 of file commit_ts.c.

References CommitTimestampShared::commitTsActive, CommitTimestampShared::dataLastCommit, error_commit_ts_disabled(), LW_SHARED, LWLockAcquire(), LWLockRelease(), CommitTimestampEntry::nodeid, CommitTimestampEntry::time, and CommitTimestampShared::xidLastCommit.

Referenced by pg_last_committed_xact().

369 {
370  TransactionId xid;
371 
372  LWLockAcquire(CommitTsLock, LW_SHARED);
373 
374  /* Error if module not enabled */
377 
379  if (ts)
381  if (nodeid)
383  LWLockRelease(CommitTsLock);
384 
385  return xid;
386 }
CommitTimestampEntry dataLastCommit
Definition: commit_ts.c:95
uint32 TransactionId
Definition: c.h:521
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
TimestampTz time
Definition: commit_ts.c:59
TransactionId xidLastCommit
Definition: commit_ts.c:94
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208
RepOriginId nodeid
Definition: commit_ts.c:60
CommitTimestampShared * commitTsShared
Definition: commit_ts.c:99
static void error_commit_ts_disabled(void)
Definition: commit_ts.c:389

◆ SetCommitTsLimit()

void SetCommitTsLimit ( TransactionId  oldestXact,
TransactionId  newestXact 
)

Definition at line 892 of file commit_ts.c.

References Assert, InvalidTransactionId, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), VariableCacheData::newestCommitTsXid, VariableCacheData::oldestCommitTsXid, ShmemVariableCache, and TransactionIdPrecedes().

Referenced by BootStrapXLOG(), and StartupXLOG().

893 {
894  /*
895  * Be careful not to overwrite values that are either further into the
896  * "future" or signal a disabled committs.
897  */
898  LWLockAcquire(CommitTsLock, LW_EXCLUSIVE);
900  {
905  }
906  else
907  {
911  }
912  LWLockRelease(CommitTsLock);
913 }
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
VariableCache ShmemVariableCache
Definition: varsup.c:34
#define InvalidTransactionId
Definition: transam.h:31
TransactionId oldestCommitTsXid
Definition: transam.h:225
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:300
#define Assert(condition)
Definition: c.h:746
TransactionId newestCommitTsXid
Definition: transam.h:226
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208

◆ ShutdownCommitTs()

void ShutdownCommitTs ( void  )

◆ StartupCommitTs()

void StartupCommitTs ( void  )

Definition at line 621 of file commit_ts.c.

References ActivateCommitTs().

Referenced by StartupXLOG().

622 {
624 }
static void ActivateCommitTs(void)
Definition: commit_ts.c:694

◆ TransactionIdGetCommitTsData()

bool TransactionIdGetCommitTsData ( TransactionId  xid,
TimestampTz ts,
RepOriginId nodeid 
)

Definition at line 282 of file commit_ts.c.

References Assert, CommitTimestampShared::commitTsActive, CommitTsCtl, CommitTimestampShared::dataLastCommit, ereport, errcode(), errmsg(), ERROR, error_commit_ts_disabled(), InvalidRepOriginId, LW_SHARED, LWLockAcquire(), LWLockRelease(), VariableCacheData::newestCommitTsXid, CommitTimestampEntry::nodeid, VariableCacheData::oldestCommitTsXid, ShmemVariableCache, SimpleLruReadPage_ReadOnly(), SizeOfCommitTimestampEntry, CommitTimestampEntry::time, TransactionIdIsNormal, TransactionIdIsValid, TransactionIdPrecedes(), TransactionIdToCTsEntry, TransactionIdToCTsPage, and CommitTimestampShared::xidLastCommit.

Referenced by pg_xact_commit_timestamp(), and pg_xact_commit_timestamp_origin().

284 {
285  int pageno = TransactionIdToCTsPage(xid);
286  int entryno = TransactionIdToCTsEntry(xid);
287  int slotno;
288  CommitTimestampEntry entry;
289  TransactionId oldestCommitTsXid;
290  TransactionId newestCommitTsXid;
291 
292  if (!TransactionIdIsValid(xid))
293  ereport(ERROR,
294  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
295  errmsg("cannot retrieve commit timestamp for transaction %u", xid)));
296  else if (!TransactionIdIsNormal(xid))
297  {
298  /* frozen and bootstrap xids are always committed far in the past */
299  *ts = 0;
300  if (nodeid)
301  *nodeid = 0;
302  return false;
303  }
304 
305  LWLockAcquire(CommitTsLock, LW_SHARED);
306 
307  /* Error if module not enabled */
310 
311  /*
312  * If we're asked for the cached value, return that. Otherwise, fall
313  * through to read from SLRU.
314  */
315  if (commitTsShared->xidLastCommit == xid)
316  {
318  if (nodeid)
320 
321  LWLockRelease(CommitTsLock);
322  return *ts != 0;
323  }
324 
325  oldestCommitTsXid = ShmemVariableCache->oldestCommitTsXid;
326  newestCommitTsXid = ShmemVariableCache->newestCommitTsXid;
327  /* neither is invalid, or both are */
328  Assert(TransactionIdIsValid(oldestCommitTsXid) == TransactionIdIsValid(newestCommitTsXid));
329  LWLockRelease(CommitTsLock);
330 
331  /*
332  * Return empty if the requested value is outside our valid range.
333  */
334  if (!TransactionIdIsValid(oldestCommitTsXid) ||
335  TransactionIdPrecedes(xid, oldestCommitTsXid) ||
336  TransactionIdPrecedes(newestCommitTsXid, xid))
337  {
338  *ts = 0;
339  if (nodeid)
340  *nodeid = InvalidRepOriginId;
341  return false;
342  }
343 
344  /* lock is acquired by SimpleLruReadPage_ReadOnly */
345  slotno = SimpleLruReadPage_ReadOnly(CommitTsCtl, pageno, xid);
346  memcpy(&entry,
347  CommitTsCtl->shared->page_buffer[slotno] +
348  SizeOfCommitTimestampEntry * entryno,
350 
351  *ts = entry.time;
352  if (nodeid)
353  *nodeid = entry.nodeid;
354 
355  LWLockRelease(CommitTsSLRULock);
356  return *ts != 0;
357 }
CommitTimestampEntry dataLastCommit
Definition: commit_ts.c:95
uint32 TransactionId
Definition: c.h:521
#define SizeOfCommitTimestampEntry
Definition: commit_ts.c:63
#define CommitTsCtl
Definition: commit_ts.c:79
int errcode(int sqlerrcode)
Definition: elog.c:610
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
#define ERROR
Definition: elog.h:43
VariableCache ShmemVariableCache
Definition: varsup.c:34
TransactionId oldestCommitTsXid
Definition: transam.h:225
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:300
TimestampTz time
Definition: commit_ts.c:59
#define TransactionIdToCTsPage(xid)
Definition: commit_ts.c:69
TransactionId xidLastCommit
Definition: commit_ts.c:94
int SimpleLruReadPage_ReadOnly(SlruCtl ctl, int pageno, TransactionId xid)
Definition: slru.c:494
#define ereport(elevel,...)
Definition: elog.h:144
#define Assert(condition)
Definition: c.h:746
TransactionId newestCommitTsXid
Definition: transam.h:226
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208
#define TransactionIdToCTsEntry(xid)
Definition: commit_ts.c:71
#define InvalidRepOriginId
Definition: origin.h:33
int errmsg(const char *fmt,...)
Definition: elog.c:821
#define TransactionIdIsValid(xid)
Definition: transam.h:41
#define TransactionIdIsNormal(xid)
Definition: transam.h:42
RepOriginId nodeid
Definition: commit_ts.c:60
CommitTimestampShared * commitTsShared
Definition: commit_ts.c:99
static void error_commit_ts_disabled(void)
Definition: commit_ts.c:389

◆ TransactionTreeSetCommitTsData()

void TransactionTreeSetCommitTsData ( TransactionId  xid,
int  nsubxids,
TransactionId subxids,
TimestampTz  timestamp,
RepOriginId  nodeid,
bool  write_xlog 
)

Definition at line 145 of file commit_ts.c.

References CommitTimestampShared::commitTsActive, CommitTimestampShared::dataLastCommit, i, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), VariableCacheData::newestCommitTsXid, CommitTimestampEntry::nodeid, SetXidCommitTsInPage(), ShmemVariableCache, CommitTimestampEntry::time, TransactionIdPrecedes(), TransactionIdToCTsPage, WriteSetTimestampXlogRec(), and CommitTimestampShared::xidLastCommit.

Referenced by commit_ts_redo(), RecordTransactionCommit(), RecordTransactionCommitPrepared(), and xact_redo_commit().

148 {
149  int i;
150  TransactionId headxid;
151  TransactionId newestXact;
152 
153  /*
154  * No-op if the module is not active.
155  *
156  * An unlocked read here is fine, because in a standby (the only place
157  * where the flag can change in flight) this routine is only called by the
158  * recovery process, which is also the only process which can change the
159  * flag.
160  */
162  return;
163 
164  /*
165  * Comply with the WAL-before-data rule: if caller specified it wants this
166  * value to be recorded in WAL, do so before touching the data.
167  */
168  if (write_xlog)
169  WriteSetTimestampXlogRec(xid, nsubxids, subxids, timestamp, nodeid);
170 
171  /*
172  * Figure out the latest Xid in this batch: either the last subxid if
173  * there's any, otherwise the parent xid.
174  */
175  if (nsubxids > 0)
176  newestXact = subxids[nsubxids - 1];
177  else
178  newestXact = xid;
179 
180  /*
181  * We split the xids to set the timestamp to in groups belonging to the
182  * same SLRU page; the first element in each such set is its head. The
183  * first group has the main XID as the head; subsequent sets use the first
184  * subxid not on the previous page as head. This way, we only have to
185  * lock/modify each SLRU page once.
186  */
187  for (i = 0, headxid = xid;;)
188  {
189  int pageno = TransactionIdToCTsPage(headxid);
190  int j;
191 
192  for (j = i; j < nsubxids; j++)
193  {
194  if (TransactionIdToCTsPage(subxids[j]) != pageno)
195  break;
196  }
197  /* subxids[i..j] are on the same page as the head */
198 
199  SetXidCommitTsInPage(headxid, j - i, subxids + i, timestamp, nodeid,
200  pageno);
201 
202  /* if we wrote out all subxids, we're done. */
203  if (j + 1 >= nsubxids)
204  break;
205 
206  /*
207  * Set the new head and skip over it, as well as over the subxids we
208  * just wrote.
209  */
210  headxid = subxids[j];
211  i += j - i + 1;
212  }
213 
214  /* update the cached value in shared memory */
215  LWLockAcquire(CommitTsLock, LW_EXCLUSIVE);
219 
220  /* and move forwards our endpoint, if needed */
223  LWLockRelease(CommitTsLock);
224 }
CommitTimestampEntry dataLastCommit
Definition: commit_ts.c:95
uint32 TransactionId
Definition: c.h:521
static void WriteSetTimestampXlogRec(TransactionId mainxid, int nsubxids, TransactionId *subxids, TimestampTz timestamp, RepOriginId nodeid)
Definition: commit_ts.c:985
int64 timestamp
static void SetXidCommitTsInPage(TransactionId xid, int nsubxids, TransactionId *subxids, TimestampTz ts, RepOriginId nodeid, int pageno)
Definition: commit_ts.c:231
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
VariableCache ShmemVariableCache
Definition: varsup.c:34
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:300
TimestampTz time
Definition: commit_ts.c:59
#define TransactionIdToCTsPage(xid)
Definition: commit_ts.c:69
TransactionId xidLastCommit
Definition: commit_ts.c:94
TransactionId newestCommitTsXid
Definition: transam.h:226
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208
int i
RepOriginId nodeid
Definition: commit_ts.c:60
CommitTimestampShared * commitTsShared
Definition: commit_ts.c:99

◆ TruncateCommitTs()

void TruncateCommitTs ( TransactionId  oldestXact)

Definition at line 866 of file commit_ts.c.

References CommitTsCtl, SimpleLruTruncate(), SlruScanDirCbReportPresence(), SlruScanDirectory(), TransactionIdToCTsPage, and WriteTruncateXlogRec().

Referenced by vac_truncate_clog().

867 {
868  int cutoffPage;
869 
870  /*
871  * The cutoff point is the start of the segment containing oldestXact. We
872  * pass the *page* containing oldestXact to SimpleLruTruncate.
873  */
874  cutoffPage = TransactionIdToCTsPage(oldestXact);
875 
876  /* Check to see if there's any files that could be removed */
878  &cutoffPage))
879  return; /* nothing to remove */
880 
881  /* Write XLOG record */
882  WriteTruncateXlogRec(cutoffPage, oldestXact);
883 
884  /* Now we can remove the old CommitTs segment(s) */
885  SimpleLruTruncate(CommitTsCtl, cutoffPage);
886 }
#define CommitTsCtl
Definition: commit_ts.c:79
void SimpleLruTruncate(SlruCtl ctl, int cutoffPage)
Definition: slru.c:1225
static void WriteTruncateXlogRec(int pageno, TransactionId oldestXid)
Definition: commit_ts.c:969
bool SlruScanDirCbReportPresence(SlruCtl ctl, char *filename, int segpage, void *data)
Definition: slru.c:1394
#define TransactionIdToCTsPage(xid)
Definition: commit_ts.c:69
bool SlruScanDirectory(SlruCtl ctl, SlruScanCallback callback, void *data)
Definition: slru.c:1449

Variable Documentation

◆ track_commit_timestamp

PGDLLIMPORT bool track_commit_timestamp