v3-0001-Elimination-of-the-repetitive-code-at-the-SLRU-bo.patch

From de4621460b1b63fb3cbc78095af31e1e6b565dd2 Mon Sep 17 00:00:00 2001
From: Evgeny Voropaev <evorop@gmail.com>
Date: Tue, 18 Feb 2025 15:48:12 +0800
Subject: [PATCH v3] Elimination of the repetitive code at the SLRU
 bootstrapping and nullifying functions.

The functions bootstrapping and nullifying SLRU pages used to have a lot of
repetitive code. New functions realized by this commit (BootStrapSlruPage,
SimpleLruZeroAndLogPage, WriteSlruZeroPageXlogRec) have moved duplicating code
into the single place and eliminated code repetitions.

Author: Evgeny Voropaev <evgeny.voropaev@tantorlabs.com> <evorop@gmail.com>
---
 src/backend/access/transam/clog.c      |  65 +-------------
 src/backend/access/transam/commit_ts.c |  65 ++------------
 src/backend/access/transam/multixact.c | 117 +++----------------------
 src/backend/access/transam/slru.c      |  73 ++++++++++++++-
 src/backend/access/transam/subtrans.c  |  35 +-------
 src/include/access/slru.h              |   5 ++
 6 files changed, 105 insertions(+), 255 deletions(-)

diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index 48f10bec91e..a78b8bde628 100644
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -110,9 +110,7 @@ static SlruCtlData XactCtlData;
 #define XactCtl (&XactCtlData)
 
 
-static int	ZeroCLOGPage(int64 pageno, bool writeXlog);
 static bool CLOGPagePrecedes(int64 page1, int64 page2);
-static void WriteZeroPageXlogRec(int64 pageno);
 static void WriteTruncateXlogRec(int64 pageno, TransactionId oldestXact,
 								 Oid oldestXactDb);
 static void TransactionIdSetPageStatus(TransactionId xid, int nsubxids,
@@ -832,41 +830,7 @@ check_transaction_buffers(int *newval, void **extra, GucSource source)
 void
 BootStrapCLOG(void)
 {
-	int			slotno;
-	LWLock	   *lock = SimpleLruGetBankLock(XactCtl, 0);
-
-	LWLockAcquire(lock, LW_EXCLUSIVE);
-
-	/* Create and zero the first page of the commit log */
-	slotno = ZeroCLOGPage(0, false);
-
-	/* Make sure it's written out */
-	SimpleLruWritePage(XactCtl, slotno);
-	Assert(!XactCtl->shared->page_dirty[slotno]);
-
-	LWLockRelease(lock);
-}
-
-/*
- * Initialize (or reinitialize) a page of CLOG to zeroes.
- * If writeXlog is true, also emit an XLOG record saying we did this.
- *
- * The page is not actually written, just set up in shared memory.
- * The slot number of the new page is returned.
- *
- * Control lock must be held at entry, and will be held at exit.
- */
-static int
-ZeroCLOGPage(int64 pageno, bool writeXlog)
-{
-	int			slotno;
-
-	slotno = SimpleLruZeroPage(XactCtl, pageno);
-
-	if (writeXlog)
-		WriteZeroPageXlogRec(pageno);
-
-	return slotno;
+	BootStrapSlruPage(XactCtl, 0, false, RM_CLOG_ID, CLOG_ZEROPAGE);
 }
 
 /*
@@ -975,8 +939,7 @@ ExtendCLOG(TransactionId newestXact)
 	LWLockAcquire(lock, LW_EXCLUSIVE);
 
 	/* Zero the page and make an XLOG entry about it */
-	ZeroCLOGPage(pageno, true);
-
+	SimpleLruZeroAndLogPage(XactCtl, pageno, true, RM_CLOG_ID, CLOG_ZEROPAGE);
 	LWLockRelease(lock);
 }
 
@@ -1067,17 +1030,6 @@ CLOGPagePrecedes(int64 page1, int64 page2)
 }
 
 
-/*
- * Write a ZEROPAGE xlog record
- */
-static void
-WriteZeroPageXlogRec(int64 pageno)
-{
-	XLogBeginInsert();
-	XLogRegisterData(&pageno, sizeof(pageno));
-	(void) XLogInsert(RM_CLOG_ID, CLOG_ZEROPAGE);
-}
-
 /*
  * Write a TRUNCATE xlog record
  *
@@ -1114,19 +1066,8 @@ clog_redo(XLogReaderState *record)
 	if (info == CLOG_ZEROPAGE)
 	{
 		int64		pageno;
-		int			slotno;
-		LWLock	   *lock;
-
 		memcpy(&pageno, XLogRecGetData(record), sizeof(pageno));
-
-		lock = SimpleLruGetBankLock(XactCtl, pageno);
-		LWLockAcquire(lock, LW_EXCLUSIVE);
-
-		slotno = ZeroCLOGPage(pageno, false);
-		SimpleLruWritePage(XactCtl, slotno);
-		Assert(!XactCtl->shared->page_dirty[slotno]);
-
-		LWLockRelease(lock);
+		BootStrapSlruPage(XactCtl, pageno, false, RM_CLOG_ID, CLOG_ZEROPAGE);
 	}
 	else if (info == CLOG_TRUNCATE)
 	{
diff --git a/src/backend/access/transam/commit_ts.c b/src/backend/access/transam/commit_ts.c
index 113fae1437a..766e8b7bf0a 100644
--- a/src/backend/access/transam/commit_ts.c
+++ b/src/backend/access/transam/commit_ts.c
@@ -114,11 +114,9 @@ static void SetXidCommitTsInPage(TransactionId xid, int nsubxids,
 static void TransactionIdSetCommitTs(TransactionId xid, TimestampTz ts,
 									 RepOriginId nodeid, int slotno);
 static void error_commit_ts_disabled(void);
-static int	ZeroCommitTsPage(int64 pageno, bool writeXlog);
 static bool CommitTsPagePrecedes(int64 page1, int64 page2);
 static void ActivateCommitTs(void);
 static void DeactivateCommitTs(void);
-static void WriteZeroPageXlogRec(int64 pageno);
 static void WriteTruncateXlogRec(int64 pageno, TransactionId oldestXid);
 
 /*
@@ -602,28 +600,6 @@ BootStrapCommitTs(void)
 	 */
 }
 
-/*
- * Initialize (or reinitialize) a page of CommitTs to zeroes.
- * If writeXlog is true, also emit an XLOG record saying we did this.
- *
- * The page is not actually written, just set up in shared memory.
- * The slot number of the new page is returned.
- *
- * Control lock must be held at entry, and will be held at exit.
- */
-static int
-ZeroCommitTsPage(int64 pageno, bool writeXlog)
-{
-	int			slotno;
-
-	slotno = SimpleLruZeroPage(CommitTsCtl, pageno);
-
-	if (writeXlog)
-		WriteZeroPageXlogRec(pageno);
-
-	return slotno;
-}
-
 /*
  * This must be called ONCE during postmaster or standalone-backend startup,
  * after StartupXLOG has initialized TransamVariables->nextXid.
@@ -747,16 +723,8 @@ ActivateCommitTs(void)
 
 	/* Create the current segment file, if necessary */
 	if (!SimpleLruDoesPhysicalPageExist(CommitTsCtl, pageno))
-	{
-		LWLock	   *lock = SimpleLruGetBankLock(CommitTsCtl, pageno);
-		int			slotno;
-
-		LWLockAcquire(lock, LW_EXCLUSIVE);
-		slotno = ZeroCommitTsPage(pageno, false);
-		SimpleLruWritePage(CommitTsCtl, slotno);
-		Assert(!CommitTsCtl->shared->page_dirty[slotno]);
-		LWLockRelease(lock);
-	}
+		BootStrapSlruPage(CommitTsCtl, pageno, 
+						  false, RM_COMMIT_TS_ID, COMMIT_TS_ZEROPAGE);
 
 	/* Change the activation status in shared memory. */
 	LWLockAcquire(CommitTsLock, LW_EXCLUSIVE);
@@ -868,7 +836,8 @@ ExtendCommitTs(TransactionId newestXact)
 	LWLockAcquire(lock, LW_EXCLUSIVE);
 
 	/* Zero the page and make an XLOG entry about it */
-	ZeroCommitTsPage(pageno, !InRecovery);
+	SimpleLruZeroAndLogPage(CommitTsCtl, pageno, 
+							!InRecovery, RM_COMMIT_TS_ID, COMMIT_TS_ZEROPAGE);
 
 	LWLockRelease(lock);
 }
@@ -982,17 +951,6 @@ CommitTsPagePrecedes(int64 page1, int64 page2)
 }
 
 
-/*
- * Write a ZEROPAGE xlog record
- */
-static void
-WriteZeroPageXlogRec(int64 pageno)
-{
-	XLogBeginInsert();
-	XLogRegisterData(&pageno, sizeof(pageno));
-	(void) XLogInsert(RM_COMMIT_TS_ID, COMMIT_TS_ZEROPAGE);
-}
-
 /*
  * Write a TRUNCATE xlog record
  */
@@ -1023,19 +981,10 @@ commit_ts_redo(XLogReaderState *record)
 	if (info == COMMIT_TS_ZEROPAGE)
 	{
 		int64		pageno;
-		int			slotno;
-		LWLock	   *lock;
-
 		memcpy(&pageno, XLogRecGetData(record), sizeof(pageno));
-
-		lock = SimpleLruGetBankLock(CommitTsCtl, pageno);
-		LWLockAcquire(lock, LW_EXCLUSIVE);
-
-		slotno = ZeroCommitTsPage(pageno, false);
-		SimpleLruWritePage(CommitTsCtl, slotno);
-		Assert(!CommitTsCtl->shared->page_dirty[slotno]);
-
-		LWLockRelease(lock);
+		
+		BootStrapSlruPage(CommitTsCtl, pageno, 
+						  false, RM_COMMIT_TS_ID, COMMIT_TS_ZEROPAGE);
 	}
 	else if (info == COMMIT_TS_TRUNCATE)
 	{
diff --git a/src/backend/access/transam/multixact.c b/src/backend/access/transam/multixact.c
index c1e2c42e1bb..6961c354306 100644
--- a/src/backend/access/transam/multixact.c
+++ b/src/backend/access/transam/multixact.c
@@ -401,8 +401,6 @@ static void mXactCachePut(MultiXactId multi, int nmembers,
 static char *mxstatus_to_string(MultiXactStatus status);
 
 /* management of SLRU infrastructure */
-static int	ZeroMultiXactOffsetPage(int64 pageno, bool writeXlog);
-static int	ZeroMultiXactMemberPage(int64 pageno, bool writeXlog);
 static bool MultiXactOffsetPagePrecedes(int64 page1, int64 page2);
 static bool MultiXactMemberPagePrecedes(int64 page1, int64 page2);
 static bool MultiXactOffsetPrecedes(MultiXactOffset offset1,
@@ -413,7 +411,6 @@ static bool MultiXactOffsetWouldWrap(MultiXactOffset boundary,
 									 MultiXactOffset start, uint32 distance);
 static bool SetOffsetVacuumLimit(bool is_startup);
 static bool find_multixact_start(MultiXactId multi, MultiXactOffset *result);
-static void WriteMZeroPageXlogRec(int64 pageno, uint8 info);
 static void WriteMTruncateXlogRec(Oid oldestMultiDB,
 								  MultiXactId startTruncOff,
 								  MultiXactId endTruncOff,
@@ -2033,70 +2030,11 @@ check_multixact_member_buffers(int *newval, void **extra, GucSource source)
 void
 BootStrapMultiXact(void)
 {
-	int			slotno;
-	LWLock	   *lock;
-
-	lock = SimpleLruGetBankLock(MultiXactOffsetCtl, 0);
-	LWLockAcquire(lock, LW_EXCLUSIVE);
-
-	/* Create and zero the first page of the offsets log */
-	slotno = ZeroMultiXactOffsetPage(0, false);
-
-	/* Make sure it's written out */
-	SimpleLruWritePage(MultiXactOffsetCtl, slotno);
-	Assert(!MultiXactOffsetCtl->shared->page_dirty[slotno]);
-
-	LWLockRelease(lock);
-
-	lock = SimpleLruGetBankLock(MultiXactMemberCtl, 0);
-	LWLockAcquire(lock, LW_EXCLUSIVE);
-
-	/* Create and zero the first page of the members log */
-	slotno = ZeroMultiXactMemberPage(0, false);
-
-	/* Make sure it's written out */
-	SimpleLruWritePage(MultiXactMemberCtl, slotno);
-	Assert(!MultiXactMemberCtl->shared->page_dirty[slotno]);
-
-	LWLockRelease(lock);
-}
-
-/*
- * Initialize (or reinitialize) a page of MultiXactOffset to zeroes.
- * If writeXlog is true, also emit an XLOG record saying we did this.
- *
- * The page is not actually written, just set up in shared memory.
- * The slot number of the new page is returned.
- *
- * Control lock must be held at entry, and will be held at exit.
- */
-static int
-ZeroMultiXactOffsetPage(int64 pageno, bool writeXlog)
-{
-	int			slotno;
-
-	slotno = SimpleLruZeroPage(MultiXactOffsetCtl, pageno);
-
-	if (writeXlog)
-		WriteMZeroPageXlogRec(pageno, XLOG_MULTIXACT_ZERO_OFF_PAGE);
-
-	return slotno;
-}
-
-/*
- * Ditto, for MultiXactMember
- */
-static int
-ZeroMultiXactMemberPage(int64 pageno, bool writeXlog)
-{
-	int			slotno;
-
-	slotno = SimpleLruZeroPage(MultiXactMemberCtl, pageno);
-
-	if (writeXlog)
-		WriteMZeroPageXlogRec(pageno, XLOG_MULTIXACT_ZERO_MEM_PAGE);
+	BootStrapSlruPage(MultiXactOffsetCtl, 0,
+					  false, RM_MULTIXACT_ID, XLOG_MULTIXACT_ZERO_OFF_PAGE);
 
-	return slotno;
+	BootStrapSlruPage(MultiXactMemberCtl, 0,
+					  false, RM_MULTIXACT_ID, XLOG_MULTIXACT_ZERO_MEM_PAGE);
 }
 
 /*
@@ -2134,7 +2072,7 @@ MaybeExtendOffsetSlru(void)
 		 * with creating a new segment file even if the page we're writing is
 		 * not the first in it, so this is enough.
 		 */
-		slotno = ZeroMultiXactOffsetPage(pageno, false);
+		slotno = SimpleLruZeroPage(MultiXactOffsetCtl, pageno);
 		SimpleLruWritePage(MultiXactOffsetCtl, slotno);
 	}
 
@@ -2569,7 +2507,8 @@ ExtendMultiXactOffset(MultiXactId multi)
 	LWLockAcquire(lock, LW_EXCLUSIVE);
 
 	/* Zero the page and make an XLOG entry about it */
-	ZeroMultiXactOffsetPage(pageno, true);
+	SimpleLruZeroAndLogPage(MultiXactOffsetCtl, pageno,
+					  		true, RM_MULTIXACT_ID, XLOG_MULTIXACT_ZERO_OFF_PAGE);
 
 	LWLockRelease(lock);
 }
@@ -2612,7 +2551,9 @@ ExtendMultiXactMember(MultiXactOffset offset, int nmembers)
 			LWLockAcquire(lock, LW_EXCLUSIVE);
 
 			/* Zero the page and make an XLOG entry about it */
-			ZeroMultiXactMemberPage(pageno, true);
+			SimpleLruZeroAndLogPage(MultiXactMemberCtl, pageno,
+						true, RM_MULTIXACT_ID, XLOG_MULTIXACT_ZERO_MEM_PAGE);
+
 
 			LWLockRelease(lock);
 		}
@@ -3347,18 +3288,6 @@ MultiXactOffsetPrecedes(MultiXactOffset offset1, MultiXactOffset offset2)
 	return (diff < 0);
 }
 
-/*
- * Write an xlog record reflecting the zeroing of either a MEMBERs or
- * OFFSETs page (info shows which)
- */
-static void
-WriteMZeroPageXlogRec(int64 pageno, uint8 info)
-{
-	XLogBeginInsert();
-	XLogRegisterData(&pageno, sizeof(pageno));
-	(void) XLogInsert(RM_MULTIXACT_ID, info);
-}
-
 /*
  * Write a TRUNCATE xlog record
  *
@@ -3401,36 +3330,18 @@ multixact_redo(XLogReaderState *record)
 	if (info == XLOG_MULTIXACT_ZERO_OFF_PAGE)
 	{
 		int64		pageno;
-		int			slotno;
-		LWLock	   *lock;
-
 		memcpy(&pageno, XLogRecGetData(record), sizeof(pageno));
 
-		lock = SimpleLruGetBankLock(MultiXactOffsetCtl, pageno);
-		LWLockAcquire(lock, LW_EXCLUSIVE);
-
-		slotno = ZeroMultiXactOffsetPage(pageno, false);
-		SimpleLruWritePage(MultiXactOffsetCtl, slotno);
-		Assert(!MultiXactOffsetCtl->shared->page_dirty[slotno]);
-
-		LWLockRelease(lock);
+		BootStrapSlruPage(MultiXactOffsetCtl, pageno,
+						  false, RM_MULTIXACT_ID, XLOG_MULTIXACT_ZERO_OFF_PAGE);
 	}
 	else if (info == XLOG_MULTIXACT_ZERO_MEM_PAGE)
 	{
 		int64		pageno;
-		int			slotno;
-		LWLock	   *lock;
-
 		memcpy(&pageno, XLogRecGetData(record), sizeof(pageno));
 
-		lock = SimpleLruGetBankLock(MultiXactMemberCtl, pageno);
-		LWLockAcquire(lock, LW_EXCLUSIVE);
-
-		slotno = ZeroMultiXactMemberPage(pageno, false);
-		SimpleLruWritePage(MultiXactMemberCtl, slotno);
-		Assert(!MultiXactMemberCtl->shared->page_dirty[slotno]);
-
-		LWLockRelease(lock);
+		BootStrapSlruPage(MultiXactMemberCtl, pageno,
+						  false, RM_MULTIXACT_ID, XLOG_MULTIXACT_ZERO_MEM_PAGE);
 	}
 	else if (info == XLOG_MULTIXACT_CREATE_ID)
 	{
diff --git a/src/backend/access/transam/slru.c b/src/backend/access/transam/slru.c
index 9ce628e62a5..cc069da19c6 100644
--- a/src/backend/access/transam/slru.c
+++ b/src/backend/access/transam/slru.c
@@ -65,6 +65,7 @@
 #include "access/slru.h"
 #include "access/transam.h"
 #include "access/xlog.h"
+#include "access/xloginsert.h"
 #include "access/xlogutils.h"
 #include "miscadmin.h"
 #include "pgstat.h"
@@ -189,7 +190,7 @@ static bool SlruScanDirCbDeleteCutoff(SlruCtl ctl, char *filename,
 									  int64 segpage, void *data);
 static void SlruInternalDeleteSegment(SlruCtl ctl, int64 segno);
 static inline void SlruRecentlyUsed(SlruShared shared, int slotno);
-
+static inline void WriteSlruZeroPageXlogRec(int64 pageno, RmgrId rmid, uint8 info);
 
 /*
  * Initialization of shared memory
@@ -363,6 +364,65 @@ check_slru_buffers(const char *name, int *newval)
 	return false;
 }
 
+/*
+ * BootStrapSlruPage, 
+ * SimpleLruZeroAndLogPage, 
+ * SimpleLruZeroPage
+ * 		- functions nullifying SLRU pages.
+ *
+ * BootStrapSlruPage is the most holistic. It performs:
+ * 		1. locking,
+ * 		2. nullifying,
+ * 		3. logging (when writeXlog is true),
+ * 		4. writing out,
+ * 		5. releasing the lock.
+ *
+ * SimpleLruZeroAndLogPage performs:
+ * 		2. nullifying,
+ * 		3. logging (when writeXlog is true),
+ * 		4. writing out.
+ * 		
+ * If the writeXlog is true, BootStrapSlruPage and SimpleLruZeroAndLogPage 
+ * emit an XLOG record saying we did this.
+ * If the writeXlog is false, the rmid and info parameters are unused.
+ * 
+ * SimpleLruZeroPage performs:
+ * 		2. nullifying.
+ */
+void
+BootStrapSlruPage(SlruCtl ctl, int64 pageno,
+				  bool writeXlog, RmgrId rmid, uint8 info)
+{
+	int			slotno;
+	LWLock	   *lock;
+
+	lock = SimpleLruGetBankLock(ctl, pageno);
+	LWLockAcquire(lock, LW_EXCLUSIVE);
+
+	/* Create and zero the page*/
+	slotno = SimpleLruZeroAndLogPage(ctl, pageno, writeXlog, rmid, info);
+
+	/* Make sure it's written out */
+	SimpleLruWritePage(ctl, slotno);
+	Assert(!ctl->shared->page_dirty[slotno]);
+
+	LWLockRelease(lock);
+}
+
+int
+SimpleLruZeroAndLogPage(SlruCtl ctl, int64 pageno, 
+						bool writeXlog, RmgrId rmid, uint8 info)
+{
+	int			slotno;
+
+	slotno = SimpleLruZeroPage(ctl, pageno);
+
+	if (writeXlog)
+		WriteSlruZeroPageXlogRec(pageno, rmid, info);
+
+	return slotno;
+}
+
 /*
  * Initialize (or reinitialize) a page to zeroes.
  *
@@ -1850,3 +1910,14 @@ SlruSyncFileTag(SlruCtl ctl, const FileTag *ftag, char *path)
 	errno = save_errno;
 	return result;
 }
+
+/*
+ * Write a SLRU ZEROPAGE xlog record
+ */
+static inline void
+WriteSlruZeroPageXlogRec(int64 pageno, RmgrId rmid, uint8 info)
+{
+	XLogBeginInsert();
+	XLogRegisterData(&pageno, sizeof(pageno));
+	(void) XLogInsert(rmid, info);
+}
diff --git a/src/backend/access/transam/subtrans.c b/src/backend/access/transam/subtrans.c
index 15153618fad..6b013801825 100644
--- a/src/backend/access/transam/subtrans.c
+++ b/src/backend/access/transam/subtrans.c
@@ -74,7 +74,6 @@ static SlruCtlData SubTransCtlData;
 #define SubTransCtl  (&SubTransCtlData)
 
 
-static int	ZeroSUBTRANSPage(int64 pageno);
 static bool SubTransPagePrecedes(int64 page1, int64 page2);
 
 
@@ -269,33 +268,7 @@ check_subtrans_buffers(int *newval, void **extra, GucSource source)
 void
 BootStrapSUBTRANS(void)
 {
-	int			slotno;
-	LWLock	   *lock = SimpleLruGetBankLock(SubTransCtl, 0);
-
-	LWLockAcquire(lock, LW_EXCLUSIVE);
-
-	/* Create and zero the first page of the subtrans log */
-	slotno = ZeroSUBTRANSPage(0);
-
-	/* Make sure it's written out */
-	SimpleLruWritePage(SubTransCtl, slotno);
-	Assert(!SubTransCtl->shared->page_dirty[slotno]);
-
-	LWLockRelease(lock);
-}
-
-/*
- * Initialize (or reinitialize) a page of SUBTRANS to zeroes.
- *
- * The page is not actually written, just set up in shared memory.
- * The slot number of the new page is returned.
- *
- * Control lock must be held at entry, and will be held at exit.
- */
-static int
-ZeroSUBTRANSPage(int64 pageno)
-{
-	return SimpleLruZeroPage(SubTransCtl, pageno);
+	BootStrapSlruPage(SubTransCtl, 0, false, 0, 0);
 }
 
 /*
@@ -334,8 +307,8 @@ StartupSUBTRANS(TransactionId oldestActiveXID)
 			LWLockAcquire(lock, LW_EXCLUSIVE);
 			prevlock = lock;
 		}
-
-		(void) ZeroSUBTRANSPage(startPage);
+		
+		(void) SimpleLruZeroPage(SubTransCtl, startPage);
 		if (startPage == endPage)
 			break;
 
@@ -395,7 +368,7 @@ ExtendSUBTRANS(TransactionId newestXact)
 	LWLockAcquire(lock, LW_EXCLUSIVE);
 
 	/* Zero the page */
-	ZeroSUBTRANSPage(pageno);
+	SimpleLruZeroPage(SubTransCtl, pageno);
 
 	LWLockRelease(lock);
 }
diff --git a/src/include/access/slru.h b/src/include/access/slru.h
index e142800aab2..3826ab5088c 100644
--- a/src/include/access/slru.h
+++ b/src/include/access/slru.h
@@ -13,6 +13,7 @@
 #ifndef SLRU_H
 #define SLRU_H
 
+#include "access/rmgr.h"
 #include "access/xlogdefs.h"
 #include "storage/lwlock.h"
 #include "storage/sync.h"
@@ -186,6 +187,10 @@ extern void SimpleLruInit(SlruCtl ctl, const char *name, int nslots, int nlsns,
 						  const char *subdir, int buffer_tranche_id,
 						  int bank_tranche_id, SyncRequestHandler sync_handler,
 						  bool long_segment_names);
+extern void BootStrapSlruPage(SlruCtl ctl, int64 pageno,
+				  bool writeXlog, RmgrId rmid, uint8 info);
+extern int  SimpleLruZeroAndLogPage(SlruCtl ctl, int64 pageno, 
+						bool writeXlog, RmgrId rmid, uint8 info);
 extern int	SimpleLruZeroPage(SlruCtl ctl, int64 pageno);
 extern int	SimpleLruReadPage(SlruCtl ctl, int64 pageno, bool write_ok,
 							  TransactionId xid);
-- 
2.47.1