Hackers,
This patch removes a couple of no-ops. I'm trying to get rid of unused
code that is in the transaction processing path.
Unrelated: it also adds an index term to the performance tips chapter.
The smgrcommit and smgrabort functions no longer do anything useful so I
removed them. We could argue that a hypotethical future storage manager
could do something at commit/abort so the hooks are needed, but we
haven't had a different storage manager for years.
If there are no objections, please apply.
--
Alvaro Herrera (<alvherre[a]dcc.uchile.cl>)
"Pensar que el espectro que vemos es ilusorio no lo despoja de espanto,
sólo le suma el nuevo terror de la locura" (Perelandra, CSLewis)
Index: doc/src/sgml/perform.sgml
===================================================================
RCS file: /home/alvherre/cvs/pgsql-server/doc/src/sgml/perform.sgml,v
retrieving revision 1.45
diff -c -r1.45 perform.sgml
*** doc/src/sgml/perform.sgml 22 Apr 2004 17:38:14 -0000 1.45
--- doc/src/sgml/perform.sgml 4 May 2004 00:44:07 -0000
***************
*** 5,10 ****
--- 5,14 ----
<chapter id="performance-tips">
<title>Performance Tips</title>
+ <indexterm zone="performance-tips">
+ <primary>performance</primary>
+ </indexterm>
+
<para>
Query performance can be affected by many things. Some of these can
be manipulated by the user, while others are fundamental to the underlying
Index: src/backend/access/transam/xact.c
===================================================================
RCS file: /home/alvherre/cvs/pgsql-server/src/backend/access/transam/xact.c,v
retrieving revision 1.165
diff -c -r1.165 xact.c
*** src/backend/access/transam/xact.c 5 Apr 2004 03:11:39 -0000 1.165
--- src/backend/access/transam/xact.c 4 May 2004 01:31:37 -0000
***************
*** 475,483 ****
TransactionId xid = GetCurrentTransactionId();
XLogRecPtr recptr;
- /* Tell bufmgr and smgr to prepare for commit */
- BufmgrCommit();
-
START_CRIT_SECTION();
/*
--- 475,480 ----
***************
*** 964,970 ****
smgrDoPendingDeletes(true);
AtCommit_Cache();
AtEOXact_Buffers(true);
- /* smgrcommit already done */
AtCommit_Locks();
--- 961,966 ----
***************
*** 1074,1080 ****
smgrDoPendingDeletes(false);
AtAbort_Cache();
AtEOXact_Buffers(false);
- smgrabort();
AtAbort_Locks();
--- 1070,1075 ----
Index: src/backend/storage/buffer/bufmgr.c
===================================================================
RCS file: /home/alvherre/cvs/pgsql-server/src/backend/storage/buffer/bufmgr.c,v
retrieving revision 1.164
diff -c -r1.164 bufmgr.c
*** src/backend/storage/buffer/bufmgr.c 25 Apr 2004 23:50:54 -0000 1.164
--- src/backend/storage/buffer/bufmgr.c 4 May 2004 00:45:19 -0000
***************
*** 940,956 ****
}
/*
- * Do whatever is needed to prepare for commit at the bufmgr and smgr levels
- */
- void
- BufmgrCommit(void)
- {
- /* Nothing to do in bufmgr anymore... */
-
- smgrcommit();
- }
-
- /*
* BufferGetBlockNumber
* Returns the block number associated with a buffer.
*
--- 940,945 ----
Index: src/backend/storage/smgr/md.c
===================================================================
RCS file: /home/alvherre/cvs/pgsql-server/src/backend/storage/smgr/md.c,v
retrieving revision 1.104
diff -c -r1.104 md.c
*** src/backend/storage/smgr/md.c 19 Apr 2004 17:42:58 -0000 1.104
--- src/backend/storage/smgr/md.c 4 May 2004 00:46:51 -0000
***************
*** 576,605 ****
}
/*
- * mdcommit() -- Commit a transaction.
- */
- bool
- mdcommit(void)
- {
- /*
- * We don't actually have to do anything here...
- */
- return true;
- }
-
- /*
- * mdabort() -- Abort a transaction.
- */
- bool
- mdabort(void)
- {
- /*
- * We don't actually have to do anything here...
- */
- return true;
- }
-
- /*
* mdsync() -- Sync previous writes to stable storage.
*/
bool
--- 576,581 ----
Index: src/backend/storage/smgr/smgr.c
===================================================================
RCS file: /home/alvherre/cvs/pgsql-server/src/backend/storage/smgr/smgr.c,v
retrieving revision 1.70
diff -c -r1.70 smgr.c
*** src/backend/storage/smgr/smgr.c 11 Feb 2004 22:55:25 -0000 1.70
--- src/backend/storage/smgr/smgr.c 4 May 2004 01:10:48 -0000
***************
*** 47,54 ****
char *buffer);
BlockNumber (*smgr_nblocks) (SMgrRelation reln);
BlockNumber (*smgr_truncate) (SMgrRelation reln, BlockNumber nblocks);
- bool (*smgr_commit) (void); /* may be NULL */
- bool (*smgr_abort) (void); /* may be NULL */
bool (*smgr_sync) (void); /* may be NULL */
} f_smgr;
--- 47,52 ----
***************
*** 56,62 ****
static const f_smgr smgrsw[] = {
/* magnetic disk */
{mdinit, NULL, mdclose, mdcreate, mdunlink, mdextend,
! mdread, mdwrite, mdnblocks, mdtruncate, mdcommit, mdabort, mdsync
}
};
--- 54,60 ----
static const f_smgr smgrsw[] = {
/* magnetic disk */
{mdinit, NULL, mdclose, mdcreate, mdunlink, mdextend,
! mdread, mdwrite, mdnblocks, mdtruncate, mdsync
}
};
***************
*** 623,671 ****
}
/*
- * smgrcommit() -- Prepare to commit changes made during the current
- * transaction.
- *
- * This is called before we actually commit.
- */
- void
- smgrcommit(void)
- {
- int i;
-
- for (i = 0; i < NSmgr; i++)
- {
- if (smgrsw[i].smgr_commit)
- {
- if (! (*(smgrsw[i].smgr_commit)) ())
- elog(FATAL, "transaction commit failed on %s: %m",
- DatumGetCString(DirectFunctionCall1(smgrout,
-
Int16GetDatum(i))));
- }
- }
- }
-
- /*
- * smgrabort() -- Abort changes made during the current transaction.
- */
- void
- smgrabort(void)
- {
- int i;
-
- for (i = 0; i < NSmgr; i++)
- {
- if (smgrsw[i].smgr_abort)
- {
- if (! (*(smgrsw[i].smgr_abort)) ())
- elog(FATAL, "transaction abort failed on %s: %m",
- DatumGetCString(DirectFunctionCall1(smgrout,
-
Int16GetDatum(i))));
- }
- }
- }
-
- /*
* smgrsync() -- Sync files to disk at checkpoint time.
*/
void
--- 621,626 ----
Index: src/include/storage/smgr.h
===================================================================
RCS file: /home/alvherre/cvs/pgsql-server/src/include/storage/smgr.h,v
retrieving revision 1.41
diff -c -r1.41 smgr.h
*** src/include/storage/smgr.h 11 Feb 2004 22:55:26 -0000 1.41
--- src/include/storage/smgr.h 4 May 2004 00:46:37 -0000
***************
*** 62,69 ****
extern BlockNumber smgrtruncate(SMgrRelation reln, BlockNumber nblocks);
extern void smgrDoPendingDeletes(bool isCommit);
extern int smgrGetPendingDeletes(bool forCommit, RelFileNode **ptr);
- extern void smgrcommit(void);
- extern void smgrabort(void);
extern void smgrsync(void);
extern void smgr_redo(XLogRecPtr lsn, XLogRecord *record);
--- 62,67 ----
***************
*** 83,90 ****
extern bool mdwrite(SMgrRelation reln, BlockNumber blocknum, char *buffer);
extern BlockNumber mdnblocks(SMgrRelation reln);
extern BlockNumber mdtruncate(SMgrRelation reln, BlockNumber nblocks);
- extern bool mdcommit(void);
- extern bool mdabort(void);
extern bool mdsync(void);
/* smgrtype.c */
--- 81,86 ----
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