8000 Refactor some repetitive SLRU code · postgres/postgres@c616785 · GitHub
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Álvaro Herrera
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Refactor some repetitive SLRU code
Functions to bootstrap and zero pages in various SLRU callers were fairly duplicative. We can slash almost two hundred lines with a couple of simple helpers: - SimpleLruZeroAndWritePage: Does the equivalent of SimpleLruZeroPage followed by flushing the page to disk - XLogSimpleInsertInt64: Does a XLogBeginInsert followed by XLogInsert of a trivial record whose data is just an int64. Author: Evgeny Voropaev <evgeny.voropaev@tantorlabs.com> Reviewed by: Álvaro Herrera <alvherre@kurilemu.de> Reviewed by: Andrey Borodin <x4mmm@yandex-team.ru> Reviewed by: Aleksander Alekseev <aleksander@timescale.com> Discussion: https://www.postgresql.org/message-id/flat/97820ce8-a1cd-407f-a02b-47368fadb14b%40tantorlabs.com
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8 files changed

+71
-255
lines changed

8 files changed

+71
-255
lines changed

‎src/backend/access/transam/clog.c

Lines changed: 6 additions & 61 deletions
Original file line numberDiff line numberDiff line change
@@ -110,9 +110,7 @@ static SlruCtlData XactCtlData;
110110
#define XactCtl (&XactCtlData)
111111

112112

113-
static int ZeroCLOGPage(int64 pageno, bool writeXlog);
114113
static bool CLOGPagePrecedes(int64 page1, int64 page2);
115-
static void WriteZeroPageXlogRec(int64 pageno);
116114
static void WriteTruncateXlogRec(int64 pageno, TransactionId oldestXact,
117115
Oid oldestXactDb);
118116
static void TransactionIdSetPageStatus(TransactionId xid, int nsubxids,
@@ -832,41 +830,8 @@ check_transaction_buffers(int *newval, void **extra, GucSource source)
832830
void
833831
BootStrapCLOG(void)
834832
{
835-
int slotno;
836-
LWLock *lock = SimpleLruGetBankLock(XactCtl, 0);
837-
838-
LWLockAcquire(lock, LW_EXCLUSIVE);
839-
840-
/* Create and zero the first page of the commit log */
841-
slotno = ZeroCLOGPage(0, false);
842-
843-
/* Make sure it's written out */
844-
SimpleLruWritePage(XactCtl, slotno);
845-
Assert(!XactCtl->shared->page_dirty[slotno]);
846-
847-
LWLockRelease(lock);
848-
}
849-
850-
/*
851-
* Initialize (or reinitialize) a page of CLOG to zeroes.
852-
* If writeXlog is true, also emit an XLOG record saying we did this.
853-
*
854-
* The page is not actually written, just set up in shared memory.
855-
* The slot number of the new page is returned.
856-
*
857-
* Control lock must be held at entry, and will be held at exit.
858-
*/
859-
static int
860-
ZeroCLOGPage(int64 pageno, bool writeXlog)
861-
{
862-
int slotno;
863-
864-
slotno = SimpleLruZeroPage(XactCtl, pageno);
865-
866-
if (writeXlog)
867-
WriteZeroPageXlogRec(pageno);
868-
869-
return slotno;
833+
/* Zero the initial page and flush it to disk */
834+
SimpleLruZeroAndWritePage(XactCtl, 0);
870835
}
871836

872837
/*
@@ -974,8 +939,9 @@ ExtendCLOG(TransactionId newestXact)
974939

975940
LWLockAcquire(lock, LW_EXCLUSIVE);
976941

977-
/* Zero the page and make an XLOG entry about it */
978-
ZeroCLOGPage(pageno, true);
942+
/* Zero the page and make a WAL entry about it */
943+
SimpleLruZeroPage(XactCtl, pageno);
944+
XLogSimpleInsertInt64(RM_CLOG_ID, CLOG_ZEROPAGE, pageno);
979945

980946
LWLockRelease(lock);
981947
}
@@ -1067,17 +1033,6 @@ CLOGPagePrecedes(int64 page1, int64 page2)
10671033
}
10681034

10691035

1070-
/*
1071-
* Write a ZEROPAGE xlog record
1072-
*/
1073-
static void
1074-
WriteZeroPageXlogRec(int64 pageno)
1075-
{
1076-
XLogBeginInsert();
1077-
XLogRegisterData(&pageno, sizeof(pageno));
1078-
(void) XLogInsert(RM_CLOG_ID, CLOG_ZEROPAGE);
1079-
}
1080-
10811036
/*
10821037
* Write a TRUNCATE xlog record
10831038
*
@@ -1114,19 +1069,9 @@ clog_redo(XLogReaderState *record)
11141069
if (info == CLOG_ZEROPAGE)
11151070
{
11161071
int64 pageno;
1117-
int slotno;
1118-
LWLock *lock;
11191072

11201073
memcpy(&pageno, XLogRecGetData(record), sizeof(pageno));
1121-
1122-
lock = SimpleLruGetBankLock(XactCtl, pageno);
1123-
LWLockAcquire(lock, LW_EXCLUSIVE);
1124-
1125-
slotno = ZeroCLOGPage(pageno, false);
1126-
SimpleLruWritePage(XactCtl, slotno);
1127-
Assert(!XactCtl->shared->page_dirty[slotno]);
1128-
1129-
LWLockRelease(lock);
1074+
SimpleLruZeroAndWritePage(XactCtl, pageno);
11301075
}
11311076
else if (info == CLOG_TRUNCATE)
11321077
{

‎src/backend/access/transam/commit_ts.c

Lines changed: 8 additions & 58 deletions
Original file line numberDiff line numberDiff line change
@@ -114,11 +114,9 @@ static void SetXidCommitTsInPage(TransactionId xid, int nsubxids,
114114
static void TransactionIdSetCommitTs(TransactionId xid, TimestampTz ts,
115115
RepOriginId nodeid, int slotno);
116116
static void error_commit_ts_disabled(void);
117-
static int ZeroCommitTsPage(int64 pageno, bool writeXlog);
118117
static bool CommitTsPagePrecedes(int64 page1, int64 page2);
119118
static void ActivateCommitTs(void);
120119
static void DeactivateCommitTs(void);
121-
static void WriteZeroPageXlogRec(int64 pageno);
122120
static void WriteTruncateXlogRec(int64 pageno, TransactionId oldestXid);
123121

124122
/*
@@ -602,28 +600,6 @@ BootStrapCommitTs(void)
602600
*/
603601
}
604602

605-
/*
606-
* Initialize (or reinitialize) a page of CommitTs to zeroes.
607-
* If writeXlog is true, also emit an XLOG record saying we did this.
608-
*
609-
* The page is not actually written, just set up in shared memory.
610-
* The slot number of the new page is returned.
611-
*
612-
* Control lock must be held at entry, and will be held at exit.
613-
*/
614-
static int
615-
ZeroCommitTsPage(int64 pageno, bool writeXlog)
616-
{
617-
int slotno;
618-
619-
slotno = SimpleLruZeroPage(CommitTsCtl, pageno);
620-
621-
if (writeXlog)
622-
WriteZeroPageXlogRec(pageno);
623-
624-
return slotno;
625-
}
626-
627603
/*
628604
* This must be called ONCE during postmaster or standalone-backend startup,
629605
* after StartupXLOG has initialized TransamVariables->nextXid.
@@ -754,16 +730,7 @@ ActivateCommitTs(void)
754730

755731
/* Create the current segment file, if necessary */
756732
if (!SimpleLruDoesPhysicalPageExist(CommitTsCtl, pageno))
757-
{
758-
LWLock *lock = SimpleLruGetBankLock(CommitTsCtl, pageno);
759-
int slotno;
760-
761-
LWLockAcquire(lock, LW_EXCLUSIVE);
762-
slotno = ZeroCommitTsPage(pageno, false);
763-
SimpleLruWritePage(CommitTsCtl, slotno);
764-
Assert(!CommitTsCtl->shared->page_dirty[slotno]);
765-
LWLockRelease(lock);
766-
}
733+
SimpleLruZeroAndWritePage(CommitTsCtl, pageno);
767734

768735
/* Change the activation status in shared memory. */
769736
LWLockAcquire(CommitTsLock, LW_EXCLUSIVE);
@@ -874,8 +841,12 @@ ExtendCommitTs(TransactionId newestXact)
874841

875842
LWLockAcquire(lock, LW_EXCLUSIVE);
876843

877-
/* Zero the page and make an XLOG entry about it */
878-
ZeroCommitTsPage(pageno, !InRecovery);
844+
/* Zero the page ... */
845+
SimpleLruZeroPage(CommitTsCtl, pageno);
846+
847+
/* and make a WAL entry about that, unless we're in REDO */
848+
if (!InRecovery)
849+
XLogSimpleInsertInt64(RM_COMMIT_TS_ID, COMMIT_TS_ZEROPAGE, pageno);
879850

880851
LWLockRelease(lock);
881852
}
@@ -989,17 +960,6 @@ CommitTsPagePrecedes(int64 page1, int64 page2)
989960
}
990961

991962

992-
/*
993-
* Write a ZEROPAGE xlog record
994-
*/
995-
static void
996-
WriteZeroPageXlogRec(int64 pageno)
997-
{
998-
XLogBeginInsert();
999-
XLogRegisterData(&pageno, sizeof(pageno));
1000-
(void) XLogInsert(RM_COMMIT_TS_ID, COMMIT_TS_ZEROPAGE);
1001-
}
1002-
1003963
/*
1004964
* Write a TRUNCATE xlog record
1005965
*/
@@ -1030,19 +990,9 @@ commit_ts_redo(XLogReaderState *record)
1030990
if (info == COMMIT_TS_ZEROPAGE)
1031991
{
1032992
int64 pageno;
1033-
int slotno;
1034-
LWLock *lock;
1035993

1036994
memcpy(&pageno, XLogRecGetData(record), sizeof(pageno));
1037-
1038-
lock = SimpleLruGetBankLock(CommitTsCtl, pageno);
1039-
LWLockAcquire(lock, LW_EXCLUSIVE);
1040-
1041-
slotno = ZeroCommitTsPage(pageno, false);
1042-
SimpleLruWritePage(CommitTsCtl, slotno);
1043-
Assert(!CommitTsCtl->shared->page_dirty[slotno]);
1044-
1045-
LWLockRelease(lock);
995+
SimpleLruZeroAndWritePage(CommitTsCtl, pageno);
1046996
}
1047997
else if (info == COMMIT_TS_TRUNCATE)
1048998
{

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