Restructure local-buffer handling per recent pghackers discussion.

The local buffer manager is no longer used for newly-created relations
(unless they are TEMP); a new non-TEMP relation goes through the shared
bufmgr and thus will participate normally in checkpoints.  But TEMP relations
use the local buffer manager throughout their lifespan.  Also, operations
in TEMP relations are not logged in WAL, thus improving performance.
Since it's no longer necessary to fsync relations as they move out of the
local buffers into shared buffers, quite a lot of smgr.c/md.c/fd.c code
is no longer needed and has been removed: there's no concept of a dirty
relation anymore in md.c/fd.c, and we never fsync anything but WAL.
Still TODO: improve local buffer management algorithms so that it would
be reasonable to increase NLocBuffer.

1 files changed, 3 insertions, 5 deletions

diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index a6952fa1f69..7aebaa73da6 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: bufmgr.h,v 1.61 2002/07/02 05:47:37 momjian Exp $
+ * $Id: bufmgr.h,v 1.62 2002/08/06 02:36:35 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -152,20 +152,18 @@ extern void	WriteBuffer(Buffer buffer);
 extern void	WriteNoReleaseBuffer(Buffer buffer);
 extern Buffer ReleaseAndReadBuffer(Buffer buffer, Relation relation,
 					 BlockNumber blockNum);
-extern int	FlushBuffer(Buffer buffer, bool sync, bool release);
 
 extern void InitBufferPool(void);
 extern void InitBufferPoolAccess(void);
 extern char *ShowBufferUsage(void);
 extern void ResetBufferUsage(void);
-extern void ResetBufferPool(bool isCommit);
-extern bool BufferPoolCheckLeak(void);
+extern void AtEOXact_Buffers(bool isCommit);
 extern void FlushBufferPool(void);
 extern BlockNumber BufferGetBlockNumber(Buffer buffer);
 extern BlockNumber RelationGetNumberOfBlocks(Relation relation);
 extern int	FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock);
 extern void DropRelationBuffers(Relation rel);
-extern void DropRelFileNodeBuffers(RelFileNode rnode);
+extern void DropRelFileNodeBuffers(RelFileNode rnode, bool istemp);
 extern void DropBuffers(Oid dbid);
 #ifdef NOT_USED
 extern void PrintPinnedBufs(void);