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Restructure local-buffer handling per recent pghackers discussion.

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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.
This commit is contained in:
Tom Lane
2002-08-06 02:36:35 +00:00
parent 35cd432b18
commit 5df307c778
28 changed files with 543 additions and 955 deletions
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23
src/include/storage/smgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: smgr.h,v 1.35 2002/06/20 20:29:52 momjian Exp $
* $Id: smgr.h,v 1.36 2002/08/06 02:36:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -36,13 +36,8 @@ extern int smgrread(int16 which, Relation reln, BlockNumber blocknum,
char *buffer);
extern int smgrwrite(int16 which, Relation reln, BlockNumber blocknum,
char *buffer);
extern int smgrflush(int16 which, Relation reln, BlockNumber blocknum,
char *buffer);
extern int smgrblindwrt(int16 which, RelFileNode rnode,
BlockNumber blkno, char *buffer, bool dofsync);
extern int smgrblindmarkdirty(int16 which, RelFileNode rnode,
BlockNumber blkno);
extern int smgrmarkdirty(int16 which, Relation reln, BlockNumber blkno);
BlockNumber blkno, char *buffer);
extern BlockNumber smgrnblocks(int16 which, Relation reln);
extern BlockNumber smgrtruncate(int16 which, Relation reln,
BlockNumber nblocks);
@@ -67,11 +62,7 @@ extern int mdopen(Relation reln);
extern int mdclose(Relation reln);
extern int mdread(Relation reln, BlockNumber blocknum, char *buffer);
extern int mdwrite(Relation reln, BlockNumber blocknum, char *buffer);
extern int mdflush(Relation reln, BlockNumber blocknum, char *buffer);
extern int mdmarkdirty(Relation reln, BlockNumber blkno);
extern int mdblindwrt(RelFileNode rnode, BlockNumber blkno,
char *buffer, bool dofsync);
extern int mdblindmarkdirty(RelFileNode rnode, BlockNumber blkno);
extern int mdblindwrt(RelFileNode rnode, BlockNumber blkno, char *buffer);
extern BlockNumber mdnblocks(Relation reln);
extern BlockNumber mdtruncate(Relation reln, BlockNumber nblocks);
extern int mdcommit(void);
@@ -87,13 +78,7 @@ extern int mmopen(Relation reln);
extern int mmclose(Relation reln);
extern int mmread(Relation reln, BlockNumber blocknum, char *buffer);
extern int mmwrite(Relation reln, BlockNumber blocknum, char *buffer);
extern int mmflush(Relation reln, BlockNumber blocknum, char *buffer);
extern int mmblindwrt(char *dbname, char *relname, Oid dbid, Oid relid,
BlockNumber blkno, char *buffer,
bool dofsync);
extern int mmmarkdirty(Relation reln, BlockNumber blkno);
extern int mmblindmarkdirty(char *dbname, char *relname, Oid dbid, Oid relid,
BlockNumber blkno);
extern int mmblindwrt(RelFileNode rnode, BlockNumber blkno, char *buffer);
extern BlockNumber mmnblocks(Relation reln);
extern BlockNumber mmtruncate(Relation reln, BlockNumber nblocks);
extern int mmcommit(void);