Make all built-in lwlock tranche IDs fixed.

This makes the values more stable, which seems like a good thing for
anybody who needs to look at at them.

Alexander Korotkov and Amit Kapila

src/backend/access/transam/clog.c

@@ -457,7 +457,7 @@ CLOGShmemInit(void)
 {
 	ClogCtl->PagePrecedes = CLOGPagePrecedes;
 	SimpleLruInit(ClogCtl, "clog", CLOGShmemBuffers(), CLOG_LSNS_PER_PAGE,
-				  CLogControlLock, "pg_clog");
+				  CLogControlLock, "pg_clog", LWTRANCHE_CLOG_BUFFERS);
 }
 
 /*

src/backend/access/transam/commit_ts.c

@@ -485,7 +485,8 @@ CommitTsShmemInit(void)
 
 	CommitTsCtl->PagePrecedes = CommitTsPagePrecedes;
 	SimpleLruInit(CommitTsCtl, "commit_timestamp", CommitTsShmemBuffers(), 0,
-				  CommitTsControlLock, "pg_commit_ts");
+				  CommitTsControlLock, "pg_commit_ts",
+				  LWTRANCHE_COMMITTS_BUFFERS);
 
 	commitTsShared = ShmemInitStruct("CommitTs shared",
 									 sizeof(CommitTimestampShared),

src/backend/access/transam/multixact.c

@@ -1831,10 +1831,12 @@ MultiXactShmemInit(void)
 
 	SimpleLruInit(MultiXactOffsetCtl,
 				  "multixact_offset", NUM_MXACTOFFSET_BUFFERS, 0,
-				  MultiXactOffsetControlLock, "pg_multixact/offsets");
+				  MultiXactOffsetControlLock, "pg_multixact/offsets",
+				  LWTRANCHE_MXACTOFFSET_BUFFERS);
 	SimpleLruInit(MultiXactMemberCtl,
 				  "multixact_member", NUM_MXACTMEMBER_BUFFERS, 0,
-				  MultiXactMemberControlLock, "pg_multixact/members");
+				  MultiXactMemberControlLock, "pg_multixact/members",
+				  LWTRANCHE_MXACTMEMBER_BUFFERS);
 
 	/* Initialize our shared state struct */
 	MultiXactState = ShmemInitStruct("Shared MultiXact State",

src/backend/access/transam/slru.c

@@ -162,7 +162,7 @@ SimpleLruShmemSize(int nslots, int nlsns)
 
 void
 SimpleLruInit(SlruCtl ctl, const char *name, int nslots, int nlsns,
-			  LWLock *ctllock, const char *subdir)
+			  LWLock *ctllock, const char *subdir, int tranche_id)
 {
 	SlruShared	shared;
 	bool		found;
@@ -215,7 +215,7 @@ SimpleLruInit(SlruCtl ctl, const char *name, int nslots, int nlsns,
 
 		Assert(strlen(name) + 1 < SLRU_MAX_NAME_LENGTH);
 		strlcpy(shared->lwlock_tranche_name, name, SLRU_MAX_NAME_LENGTH);
-		shared->lwlock_tranche_id = LWLockNewTrancheId();
+		shared->lwlock_tranche_id = tranche_id;
 		shared->lwlock_tranche.name = shared->lwlock_tranche_name;
 		shared->lwlock_tranche.array_base = shared->buffer_locks;
 		shared->lwlock_tranche.array_stride = sizeof(LWLockPadded);

src/backend/access/transam/subtrans.c

@@ -179,7 +179,8 @@ SUBTRANSShmemInit(void)
 {
 	SubTransCtl->PagePrecedes = SubTransPagePrecedes;
 	SimpleLruInit(SubTransCtl, "subtrans", NUM_SUBTRANS_BUFFERS, 0,
-				  SubtransControlLock, "pg_subtrans");
+				  SubtransControlLock, "pg_subtrans",
+				  LWTRANCHE_SUBTRANS_BUFFERS);
 	/* Override default assumption that writes should be fsync'd */
 	SubTransCtl->do_fsync = false;
 }

src/backend/commands/async.c

@@ -480,7 +480,7 @@ AsyncShmemInit(void)
 	 */
 	AsyncCtl->PagePrecedes = asyncQueuePagePrecedes;
 	SimpleLruInit(AsyncCtl, "async", NUM_ASYNC_BUFFERS, 0,
-				  AsyncCtlLock, "pg_notify");
+				  AsyncCtlLock, "pg_notify", LWTRANCHE_ASYNC_BUFFERS);
 	/* Override default assumption that writes should be fsync'd */
 	AsyncCtl->do_fsync = false;
 

src/backend/replication/logical/origin.c

@@ -473,7 +473,7 @@ ReplicationOriginShmemInit(void)
 	{
 		int			i;
 
-		replication_states_ctl->tranche_id = LWLockNewTrancheId();
+		replication_states_ctl->tranche_id = LWTRANCHE_REPLICATION_ORIGIN;
 		replication_states_ctl->tranche.name = "ReplicationOrigins";
 		replication_states_ctl->tranche.array_base =
 			&replication_states[0].lock;

src/backend/storage/lmgr/predicate.c

@@ -795,7 +795,8 @@ OldSerXidInit(void)
 	 */
 	OldSerXidSlruCtl->PagePrecedes = OldSerXidPagePrecedesLogically;
 	SimpleLruInit(OldSerXidSlruCtl, "oldserxid",
-				  NUM_OLDSERXID_BUFFERS, 0, OldSerXidLock, "pg_serial");
+				  NUM_OLDSERXID_BUFFERS, 0, OldSerXidLock, "pg_serial",
+				  LWTRANCHE_OLDSERXID_BUFFERS);
 	/* Override default assumption that writes should be fsync'd */
 	OldSerXidSlruCtl->do_fsync = false;
 

src/include/access/slru.h

@@ -144,7 +144,7 @@ typedef SlruCtlData *SlruCtl;
 
 extern Size SimpleLruShmemSize(int nslots, int nlsns);
 extern void SimpleLruInit(SlruCtl ctl, const char *name, int nslots, int nlsns,
-			  LWLock *ctllock, const char *subdir);
+			  LWLock *ctllock, const char *subdir, int tranche_id);
 extern int	SimpleLruZeroPage(SlruCtl ctl, int pageno);
 extern int SimpleLruReadPage(SlruCtl ctl, int pageno, bool write_ok,
 				  TransactionId xid);

src/include/storage/lwlock.h

@@ -210,9 +210,17 @@ extern void LWLockInitialize(LWLock *lock, int tranche_id);
 typedef enum BuiltinTrancheIds
 {
 	LWTRANCHE_MAIN,
+	LWTRANCHE_CLOG_BUFFERS,
+	LWTRANCHE_COMMITTS_BUFFERS,
+	LWTRANCHE_SUBTRANS_BUFFERS,
+	LWTRANCHE_MXACTOFFSET_BUFFERS,
+	LWTRANCHE_MXACTMEMBER_BUFFERS,
+	LWTRANCHE_ASYNC_BUFFERS,
+	LWTRANCHE_OLDSERXID_BUFFERS,
 	LWTRANCHE_WAL_INSERT,
 	LWTRANCHE_BUFFER_CONTENT,
 	LWTRANCHE_BUFFER_IO_IN_PROGRESS,
+	LWTRANCHE_REPLICATION_ORIGIN,
 	LWTRANCHE_REPLICATION_SLOT_IO_IN_PROGRESS,
 	LWTRANCHE_PROC,
 	LWTRANCHE_FIRST_USER_DEFINED